Bsi bs en 12309 6 2014

5.2.2.2 Medium temperature application Table 8 — Part load conditions for reference seasonal performance calculation in heating mode of to-water appliances for medium temperature applic

Scope of EN 12309

Appliances covered by this standard include one or a combination of the following:

— gas-fired sorption chiller/heater;

— gas-fired sorption heat pump

This European Standard applies to appliances designed to be used for space heating or cooling or refrigeration with or without heat recovery

This European Standard pertains to appliances equipped with flue gas systems of type B and type C, as defined by CEN/TR 1749, as well as those intended for outdoor installations It is important to note that EN 12309 is not applicable to air conditioners; it exclusively applies to specific appliances with designated flue gas systems.

— integral burners under the control of fully automatic burner control systems,

— closed system refrigerant circuits in which the refrigerant does not come into direct contact with the water or air to be cooled or heated,

— mechanical means to assist transportation of the combustion air and/or the flue gas

The above appliances can have one or more primary or secondary functions (i.e heat recovery - see definitions in EN 12309-1:2014)

In the case of packaged units (consisting of several parts), this European Standard applies only to those designed and supplied as a complete package

The appliances having their condenser cooled by air and by the evaporation of external additional water are not covered by EN 12309

Installations for heating and cooling in industrial processes are excluded from the EN 12309 standard It is essential to utilize all symbols provided in this text, irrespective of the language.

Scope of this Part 6 to EN 12309

EN 12309 outlines the calculation methods for seasonal performance of gas-fired sorption appliances used for heating and/or cooling, specifically for units with a net heat input of up to 70 kW It focuses on the reference seasonal performance calculations for both cooling and heating modes in monovalent and bivalent systems.

This European Standard provides essential guidelines for calculating the energy efficiency of specific heat pump systems in buildings during heating mode, as outlined in EN 15316-4-2.

Appliances covered by this standard include one or a combination of the following:

— gas-fired sorption chiller/heater;

— gas-fired sorption heat pump

This European Standard applies to appliances designed to be used for space heating or cooling or refrigeration with or without heat recovery

This European Standard applies to appliances having flue gas systems of type B and type C (according to

CEN/TR 1749) and to appliances designed for outdoor installations EN 12309 does not apply to air conditioners, it only applies to appliances having:

— integral burners under the control of fully automatic burner control systems,

— closed system refrigerant circuits in which the refrigerant does not come into direct contact with the water or air to be cooled or heated,

— mechanical means to assist transportation of the combustion air and/or the flue gas

The above appliances can have one or more primary or secondary functions (i.e heat recovery - see definitions in EN 12309-1:2014)

In the case of packaged units (consisting of several parts), this European Standard applies only to those designed and supplied as a complete package

The appliances having their condenser cooled by air and by the evaporation of external additional water are not covered by EN 12309

Installations used for heating and/or cooling of industrial processes are not within the scope of EN 12309

All the symbols given in this text should be used regardless of the language used

1.2 Scope of this Part 6 to EN 12309

EN 12309 outlines the calculation methods for determining the seasonal performance of gas-fired sorption appliances used for heating and/or cooling, specifically those with a net heat input of up to 70 kW It focuses on the reference seasonal performance calculations for both cooling and heating modes in monovalent and bivalent systems.

This European Standard provides essential guidelines for calculating the energy efficiency of specific heat pump systems in buildings during heating mode, as outlined in EN 15316-4-2.

This document references essential materials that are crucial for its application For references with specific dates, only the cited edition is applicable In the case of undated references, the most recent edition, including any amendments, is relevant.

EN 12309-1:2014, Gas-fired sorption appliances for heating and/or cooling with a net heat input not exceeding

70 kW ― Part 1: Terms and definitions

EN 12309-4:2014, Gas-fired sorption appliances for heating and/or cooling with a net heat input not exceeding

EN 15502-1, Gas-fired heating boilers ― Part 1: General requirements and tests

For the purposes of this document, the terms and definitions given in EN 12309-1:2014 apply.

General

The reference Seasonal Gas Utilization Efficiency ratio in cooling mode (SGUEc) and the reference Seasonal Auxiliary Energy factor in cooling mode (SAEFc) are calculated using the bin method This involves determining the part load Gas Utilization Efficiency ratio in cooling mode (GUEc) and the Auxiliary Energy Factor in cooling mode (AEFc) at each bin temperature through linear interpolation of the corresponding part load values at reference conditions A, B, C, and D.

The part load conditions A, B, C, D provide the part load ratios and the temperature test conditions at four reference outdoor air dry bulb temperatures: 35 °C, 30 °C, 25 °C and 20 °C

The part load ratio corresponding to a given outdoor temperature Tj is defined according to Formula (1):

At part load condition A, the declared capacity of the appliance is assumed equal to the building load (i.e capacity ratio = 100 %)

At part load conditions B, C, and D, the appliance's declared capacity exceeds the building load, resulting in a capacity ratio (CR) of less than one, as it compares the cooling load (Pc) to the declared capacity (DC) under identical temperature conditions Consequently, both the GUEc and AEFc are influenced by the temperature test conditions and the capacity ratio The determination methods for GUEc and AEFc are outlined in EN 12309-4:2014.

Part load conditions

General

For the indoor heat exchanger both fan coil and floor cooling applications are considered

In fan coil applications, it is essential to differentiate between appliances that permit variations in outlet water temperature based on outdoor temperature and those that do not Variable outlet temperatures should only be utilized when the programming unit adjusts the outlet temperature according to outdoor air temperature changes.

Air-to-water appliances

Table 1 — Part load conditions for the seasonal performance calculation in cooling mode of air-to- water appliances

Outdoor heat exchanger Indoor heat exchanger

Fan coil application Inlet / outlet water temperatures °C

Floor cooling application Inlet / outlet water temperatures Fixed outlet Variable outlet °C

D (20–16) / (35–16) 20 a / 7 a / 11,5 a / 18 a With the water flow rate as determined during standard rating test with a fixed water flow rate.

Water-to-water and brine-to-water appliances

Table 2 — Part load conditions for the seasonal performance calculation in cooling mode of water-to- water appliances and brine to water appliances

Cooling tower application Inlet/outlet wat temperatures er °C

Ground couple d application (water or brine) Inlet/outlet wat temperatures er °C

Dry cooler application Inlet/outlet wat temperatures er °C

Fan coil application Inlet/outlet wate r temperatures °C

Floor cooling application Inlet/outlet wat temperatures er Fixed °C outlet Variabl e outlet

18 / a 10 / a 35 / a a / 7 a / 11,5 a / 18 a With the water flow rate as determined during standard rating test with a fixed water flow rate.

Calculation of reference SGUEc

The calculation of the reference Seasonal Gas Utilization Efficiency ratio in cooling mode (SGUEc) that applies to all types of appliances is given by Formula (2):

Table 1 — Part load conditions for the seasonal performance calculation in cooling mode of air-to- water appliances

Fan coil application Inlet / outlet water temperatures °C

Inlet / outlet water temperatures Fixed outlet Variable outlet °C

D (20–16) / (35–16) 20 a / 7 a / 11,5 a / 18 a With the water flow rate as determined during standard rating test with a fixed water flow rate

4.2.3 Water-to-water and brine-to-water appliances

Table 2 — Part load conditions for the seasonal performance calculation in cooling mode of water-to- water appliances and brine to water appliances

Inlet/outlet wat temperatures er °C

Ground couple d application (water or brine)

Inlet/outlet wat temperatures er °C

Inlet/outlet wat temperatures er

18 / a 10 / a 35 / a a / 7 a / 11,5 a / 18 a With the water flow rate as determined during standard rating test with a fixed water flow rate

The calculation of the reference Seasonal Gas Utilization Efficiency ratio in cooling mode (SGUEc) that applies to all types of appliances is given by Formula (2):

Tj is the bin temperature; j is the bin number; n is the number of bins;

The cooling load of the building, denoted as Pc(Tj), should not exceed the declared capacity of the appliance at the specific temperature Tj The variable hj represents the number of bin hours at this temperature, while f on indicates the fraction of those hours during which the appliance is operational.

GUEc(Tj) is the GUEc of the appliance for the corresponding temperature Tj

The values to be used for j, Tj and hj are determined in Table 3

Table 3 — bin number j , outdoor bin temperature Tj in °C and number of hours per bin hj corresponding to the reference cooling season j (#) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

The value of f on can be found in Annex C

The cooling load, which should not exceed the declared capacity of the appliance, is calculated by multiplying the full load value (P designc) by the part load ratio PLRc(Tj) for the specific bin.

Pc = designc × (3) where PLRc(Tj) is:

— defined according to Formula (1) for Tj less than or equal to 35 °C;

— always 1 for Tj greater than 35 °C

The GUEc values at each bin are determined via interpolation of the GUEc values at part load conditions A, B,

For part load conditions exceeding condition A, the GUEc values should remain consistent with those of condition A Conversely, for part load conditions falling below condition D, the GUEc values should align with those of condition D.

Calculation of reference SAEFc

The Seasonal Auxiliary Energy Factor in cooling mode (SAEFc) for all appliance types is calculated by dividing the reference annual cooling demand by the annual electricity consumption.

The annual electricity consumption includes the power consumption during active mode, thermostat off mode, standby mode and off mode

Qref c is the reference annual cooling demand, expressed in kWh, as defined in 4.5;

SAEFc on is the Seasonal Auxiliary Energy Factor in cooling mode and active mode, as defined in

H TO, H SB, and H OFF represent the hours an appliance operates in thermostat off mode, standby mode, and off mode, respectively The cooling hours are specified in Annex C.

The electricity consumption during thermostat off mode (P TO), standby mode (P SB), and off mode (P OFF) is measured in kilowatts (kW) These measurements must be conducted in accordance with the EN 12309–4:2014 standard.

Calculation of reference annual cooling demand (Qref c )

The annual cooling demand, measured in kWh, is determined by multiplying the design cooling load (P_{designc}) by the number of equivalent cooling hours (H_{ec}) This relationship can be expressed as: \[P_{refc} = P_{designc} \times H_{ec}\]

The number of equivalent cooling hours (H ec) can be found in Annex C.

Calculation of reference SAEFc on

The reference SAEFc on is determined as follows:

Tj is the bin temperature; j is the bin number; n is the number of bin;

The cooling load of the building at temperature Tj, denoted as Pc(Tj), is influenced by the number of bin hours, hj, that occur at that specific temperature Additionally, the fraction of bin hours during which the appliance is operational is represented by f on.

AEFc (Tj) is the AEFc values of the appliance for the corresponding temperature Tj

Qref c is the reference annual cooling demand, expressed in kWh, as defined in 4.5;

SAEFc on is the Seasonal Auxiliary Energy Factor in cooling mode and active mode, as defined in

H TO, H SB, and H OFF represent the hours an appliance operates in thermostat off mode, standby mode, and off mode, respectively The cooling hours are specified in Annex C.

The electricity consumption during thermostat off mode (P TO), standby mode (P SB), and off mode (P OFF) is measured in kilowatts (kW) These measurements must be conducted in accordance with the EN 12309–4:2014 standard.

4.5 Calculation of reference annual cooling demand ( Q ref c )

The reference annual cooling demand is expressed in kWh and can be calculated as the design cooling load

(P designc) multiplied by the number of equivalent cooling hours (H ec): ec designc refc P H

The number of equivalent cooling hours (H ec) can be found in Annex C

4.6 Calculation of reference SAEFc on

The reference SAEFc on is determined as follows:

Tj is the bin temperature; j is the bin number; n is the number of bin;

The cooling load of the building at temperature Tj, denoted as Pc(Tj), is influenced by the number of bin hours, hj, that occur at that specific temperature Additionally, the fraction of bin hours during which the appliance is operational is represented by f on.

AEFc (Tj) is the AEFc values of the appliance for the corresponding temperature Tj

The value of f on can be found in Annex C

The cooling load Pc(Tj) shall be determined according to Formula (3)

The AEFc values at each bin are determined via interpolation of the AEFc values at part load conditions A, B,

For part load conditions exceeding condition A, the AEFc values will remain consistent with those of condition A Conversely, for part load conditions falling below condition D, the AEFc values will align with those of condition D.

Procedures for the determination of GUEc / AEFc values

In part load condition A (full load), the appliance's declared capacity matches the cooling load (P designc), necessitating the use of full capacity test methods as outlined in EN 12309-4:2014.

In part load conditions B, C, D, the test methods at reduced capacity shall be used, as defined in

General

For the purpose of calculating the reference seasonal performance in heating mode, three reference climatic conditions are defined: average (A), warmer (W) and colder (C)

The relevant reference design outdoor temperature for heating (T designh) and bivalent temperature (T bivalent) values are set as follows:

Table 4 — Design temperature and bivalent temperature upper limit for the different reference heating seasons

For bivalent appliances, the T bivalent can range from T designh to the upper limit of T bivalent After defining T bivalent in terms of dry bulb temperature, the wet bulb temperature can be determined by subtracting a specific value from the dry bulb temperature.

1 K For monovalent appliances, T bivalent shall be assumed equal to T designh

When evaluating air to water appliances, it is essential to consider the declared Operation Limit Temperature (TOL) of the heat pump A TOL that exceeds the design temperature (T designh) is acceptable solely for bivalent appliances Conversely, if the TOL is below the design temperature, it can be assumed to be equal to the design temperature.

The seasonal performance calculation utilizes the bin method, determining the part load Gas Utilization Efficiency ratio in heating mode (GUEh) and the Auxiliary Energy Factor in heating mode (AEFh) at each bin temperature through linear interpolation of the corresponding part load values at reference conditions O, A, B, C, D, E, and F.

The part load conditions O, A, B, C and D provide the part load ratios and the temperature test conditions at four reference outdoor air dry bulb temperatures: −15 °C, −7 °C, +2 °C, +7 °C and +12 °C

Part load conditions E and F specify the part load ratios and temperature test conditions at the appliance's operational limit outdoor temperature (TOL) and the bivalent outdoor temperature (T bivalent).

Under part load conditions where the outdoor temperature is at or below the specified bivalent temperature, the appliance's declared capacity meets or falls short of the heating load requirements In this scenario, the appliance functions at its maximum capacity, while any shortfall in heating load is supplemented by an auxiliary gas boiler The full capacity values of GUEh and AEFh should be utilized.

At the T bivalent part load condition (F), the appliance’s declared capacity is equal to the requested heating load

In this scenario, the appliance functions at its peak performance, with any auxiliary gas-fired heating system disabled The GUEh and AEFh values should be utilized at full capacity.

Under partial load conditions, the appliance's declared capacity exceeds the building load, leading to the shutdown of any auxiliary gas-fired heating system Consequently, the capacity ratio (CR), defined as the heating load (Ph) divided by the declared capacity (DC) at identical temperature conditions, falls below 1 Both the gross useful energy (GUEh) and annual energy efficiency (AEFh) are influenced by the temperature test conditions and the capacity ratio The determination methods for GUEh and AEFh are outlined in EN 12309-4:2014.

Part load conditions

General

The part load conditions for various appliances, including air-to-water, water-to-water, and brine-to-water systems, are detailed according to the heating season (average, warmer, colder) and application temperatures (low, medium, high, very high) For comprehensive information, refer to the table of part load conditions in heating mode located in Annex F.

Appliances that adjust the outlet water temperature based on outdoor conditions are evaluated alongside those that do not The variable outlet temperature testing method outlined in the tables below is applicable only when the programming unit modifies the outlet temperature in response to outdoor air temperature changes.

Part load conditions E and F outline the part load ratios and temperature test conditions at the appliance's operational limit outdoor temperature (TOL) and the bivalent outdoor temperature (T bivalent).

Under part load conditions where the outdoor temperature is at or below the defined bivalent temperature, the appliance's declared capacity meets or falls short of the required heating load In this scenario, the appliance functions at its maximum capacity, while any shortfall in heating load is supplemented by an auxiliary gas boiler The full capacity values of GUEh and AEFh should be utilized.

At the T bivalent part load condition (F), the appliance’s declared capacity is equal to the requested heating load

In this scenario, the appliance functions at its peak performance, with any auxiliary gas-fired heating system disabled The GUEh and AEFh should be utilized at full capacity.

At any other part load conditions, the declared capacity of the appliance is larger than the building load

The auxiliary gas-fired heating system is deactivated when the appliance capacity ratio (CR), defined as the heating load (Ph) divided by the declared capacity (DC) under identical temperature conditions, falls below 1 Both the gross useful energy (GUEh) and annual energy efficiency (AEFh) are influenced by the temperature test conditions and the capacity ratio The determination methods for GUEh and AEFh are outlined in the standard EN 12309-4:2014.

The part load conditions for various appliances, including air-to-water, water-to-water, and brine-to-water systems, are detailed according to the heating season (average, warmer, colder) and application temperatures (low, medium, high, very high) For comprehensive information, refer to the table of part load conditions in heating mode located in Annex F.

Appliances that adjust the outlet water temperature based on outdoor conditions are evaluated alongside those that do not The variable outlet temperature testing method outlined in the tables below is applicable only when the programming unit modifies the outlet temperature in response to outdoor air temperature changes.

Air-to-water appliances

Table 5 — Part load conditions for reference seasonal performance calculation in heating mode of air to-water appliances for low temperature application for the reference heating season (A) = average

(A) Outdoor heat exchanger Indoor heat exchanger

Outdoor air Inlet / outlet temperatures Inlet dry bulb (wet bulb) temperature °C

F (T bivalent-16) / (T designh-16) T bivalent a / 35 a / b a With the water flow rate as determined at standard rating test conditions for low temperature applications given in

The EN 12309–3:2014 standard applies to appliances with a fixed water flow rate or those with a flow rate determined by the appliance controller for variable water flow systems Additionally, the variable outlet must be calculated through interpolation between the upper and lower temperatures that are nearest to the bivalent temperature.

Table 6 — Part load conditions for reference seasonal performance calculation in heating mode of air to-water appliances for low temperature application for the reference heating season (W) = warmer

Outdoor Air Inlet/Outlet temperatures

Table 7 — Part load conditions for reference seasonal performance calculation in heating mode of air to-water appliances for low temperature application for the reference heating season (C) = colder

Table 8 — Part load conditions for reference seasonal performance calculation in heating mode of air- to-water appliances for medium temperature application for the reference heating season

Outdoor air Inlet / outlet temperatures Inlet dry bulb (wet bulb) temperature Fixed outlet Variable outlet

F (T bivalent-16) / (T designh-16) T bivalent a / 45 a / b a With the water flow rate as determined at standard rating test conditions for medium temperature applications given in

Table 7 — Part load conditions for reference seasonal performance calculation in heating mode of air to-water appliances for low temperature application for the reference heating season (C) = colder

The EN 12309–3:2014 standard applies to appliances with a fixed water flow rate or those where the flow rate is determined and adjusted by the appliance controller for variable water flow systems Additionally, the variable outlet must be calculated through interpolation between the upper and lower temperatures that are nearest to the bivalent temperature.

Outdoor air Inlet / outlet temperatures Inlet dry bulb (wet bulb) temperature Fixed outlet Variable outlet

Outdoor Air Inlet/Outlet temperatures Inlet dry (wet) bulb °C

Table 10 — Part load conditions for reference seasonal performance calculation in heating mode of air-to-water appliances for medium temperature application for the reference heating season

Table 11 — Part load conditions for reference seasonal performance calculation in heating mode of air-to-water appliances for high temperature application for the reference heating season

Outdoor air Inlet / outlet temperatures Inlet dry bulb

F (T bivalent-16) / (T designh-16) T bivalent a / 55 a / b a With the water flow rate as determined at standard rating test conditions for high temperature applications given in

Table 12 — Part load conditions for reference seasonal performance calculation in heating mode of air- to-water appliances for high temperature application for the reference heating season

Table 11 — Part load conditions for reference seasonal performance calculation in heating mode of air-to-water appliances for high temperature application for the reference heating season

Outdoor air Inlet / outlet temperatures Inlet dry bulb

Table 12 — Part load conditions for reference seasonal performance calculation in heating mode of air- to-water appliances for high temperature application for the reference heating season

Table 13 — Part load conditions for reference seasonal performance calculation in heating mode of air-to-water appliances for high temperature application for the reference heating season (C) = colder

Table 14 — Part load conditions for reference seasonal performance calculation in heating mode of air-to-water appliances for very high temperature application for the reference heating season

Outdoor air Inlet / outlet temperatures

Inlet dry bulb (wet bulb) temperature °C

F (T bivalent-16) / (T designh-16) T bivalent a / 65 a / b a With the water flow rate as determined at standard rating test conditions for very high temperature applications given in

The water flow rate for very high temperature applications is determined according to the standard rating test conditions outlined in EN 12309–3:2014 This applies to appliances with either a fixed water flow rate or a variable flow rate set by the appliance controller Additionally, the variable outlet must be calculated through interpolation between the upper and lower temperatures that are nearest to the bivalent temperature.

Water-to-water and brine-to-water appliances

This article examines appliances that either permit or restrict changes in outlet water temperature based on outdoor temperature variations The variable outlet temperature is applicable only when the control system adjusts the outlet temperature in response to outdoor air temperature changes.

The part load conditions for the different application temperatures and heating seasons are given in the following tables

Table 17 — Part load conditions for reference seasonal performance calculation in heating mode of water/brine-to-water appliances for low temperature application for the reference heating season

Outdoor heat exchanger Indoor heat exchanger Ground

Water Brine Inlet / outlet temperatures

The flow rate of water/brine is determined based on the inlet and outlet temperatures specified in EN 12309–3:2014, under standard rating test conditions for low temperature applications This includes the parameters F (T bivalent-16) / (T designh-16) 10 / a 0 / a b / 35 b / c a, ensuring accurate measurements for optimal performance.

The EN 12309–3:2014 standard applies to units with a fixed water flow rate or those that utilize variable water flow rate control For units with a variable outlet, calculations must be performed through interpolation between the upper and lower temperatures that are nearest to the bivalent temperature.

Table 18 — Part load conditions for reference seasonal performance calculation in heating mode of water/brine-to-water appliances for low temperature application for the reference heating seasons

The flow rate of water/brine is determined based on the inlet and outlet temperatures specified in EN 12309–3:2014, under standard rating test conditions for low temperature applications This includes the parameters F (T bivalent-16) / (T designh-16) 10 / a 0 / a b / 35 b / c a, ensuring accurate measurements for optimal performance.

The EN 12309–3:2014 standard applies to units with a fixed water flow rate or those that utilize variable water flow rate control For units with a variable outlet, the flow rate must be determined through interpolation between the upper and lower temperatures that are nearest to the bivalent temperature.

(C) Outdoor heat exchanger Indoor heat exchanger

Ground Water Brine Inlet / outlet temperatures Part load ratio Part load ratio

The flow rate of water/brine is determined based on the inlet and outlet temperatures specified in EN 12309–3:2014, under standard rating test conditions for low temperature applications This includes the parameters F (T bivalent-16) and (T designh-16), with specific values of 10, 0, a, b, 35 b, and c a.

The EN 12309–3:2014 standard applies to units with a fixed water flow rate or those that utilize variable water flow rate control For units with a variable outlet, calculations should be performed through interpolation between the upper and lower temperatures that are nearest to the bivalent temperature.

The flow rate of water/brine is determined based on the inlet and outlet temperatures specified in EN 12309–3:2014, under standard rating test conditions for low temperature applications This includes the flow rate measured at these standard conditions.

(C) Outdoor heat exchanger Indoor heat exchanger

Ground Water Brine Inlet / outlet temperatures Part load ratio Part load ratio

The flow rate of water/brine is determined based on the inlet and outlet temperatures specified in EN 12309–3:2014, under standard rating test conditions for low temperature applications.

Table 20 — Part load conditions for reference seasonal performance calculation in heating mode of water/brine-to-water appliances for medium temperature application for the reference heating season

Ground Water Brine Inlet / outlet temperatures

The flow rate of water/brine is determined based on the inlet and outlet temperatures specified in EN 12309–3:2014, under standard rating test conditions for medium temperature applications This includes the parameters F (T bivalent-16) / (T designh-16) 10 / a 0 / a b / 45 b / c a, ensuring accurate measurements for optimal performance.

The flow rate of water/brine is determined based on the inlet and outlet temperatures specified in EN 12309–3:2014, under standard rating test conditions for medium temperature applications.

Calculation of reference SPERh

The Seasonal Primary Energy Ratio in heating mode (SPERh) is determined according to Formula (8):

Prim gas is the primary energy factor for gas, value based on ErP Directive (2009/125/EC) or by default equal to 1 on GCV;

Prim elec is the primary energy factor for electricity, value based on ErP Directive (2009/125/EC) or by default equal to 2,5;

SGUEh is the seasonal gas utilization efficiency in heating mode, as defined in 5.4;

SAEFh is the seasonal auxiliary energy factor in heating mode, as defined in 5.5.

Calculation of reference SGUEh

The reference SGUEh for monovalent appliances is determined as follows:

Ph(Tj) represents the building's heating load at a specific temperature Tj, measured in kW, while hj indicates the number of bin hours associated with that temperature.

GUEh (Tj) is the GUEh values of the appliance for the corresponding temperature Tj

The reference SGUEh for bivalent appliances shall be determined as specified in Annex D

Table 29 — bin number j , outdoor temperature Tj in °C and number of hours per bin hj corresponding to the reference heating seasons “warmer”, “average”, “colder”

Warmer (W) Average (A) Colder (C) j T j hj W hjA hjC

The heating load Ph(Tj) can be determined by multiplying the full load value (P designh) with the part load ratio

PLRh(Tj) of each corresponding bin

In Formula (10) above, the part load ratio PLRh(Tj) is defined according to Formula (7), i.e.:

— for the average heating season: PLRh(Tj) = (Tj-16) / (−10–16);

— for the warmer heating season: PLRh(Tj) = (Tj-16) / (+2–16);

— for the colder heating season: PLRh(Tj) = (Tj-16) / (−22–16)

The GUEh and capacity values for each bin are calculated through interpolation based on part load conditions A, B, C, D, and occasionally E, F, and O This interpolation process utilizes the GUEh values and capacities from the two nearest part load conditions.

The GUEh values and capacity values for part load conditions above D are extrapolated from the GUEh values and capacity values at part load conditions C and D

In case of the colder climate, an additional calculation point at −15 °C (condition O) has to be taken for the capacity and GUEh

NOTE For bivalent appliances, distinction is made between SGUEh and SGUEhnet (see Annex D).

Calculation of reference SAEFh

The calculation of the reference SAEFh that applies to all types of appliances is given by the reference annual heating demand divided by the annual electricity consumption

Q refh is the reference annual heating demand, expressed in kWh, as defined in 5.6;

SAEFh on is the Seasonal Auxiliary Energy Factor in heating mode and active mode, as defined in

H TO, H SB, and H OFF represent the hours the appliance operates in thermostat off mode, standby mode, and off mode, respectively The heating hours are specified in Annex C.

Electricity consumption during thermostat off mode, standby mode, and off mode is represented by P TO, P SB, and P OFF, respectively, measured in kW The measurements for H TO, H SB, and H OFF should be conducted according to specified guidelines.

Calculation of reference annual heating demand (Q refh )

The annual heating demand, measured in kWh, is determined by multiplying the design heating load (P_{designh}) by the equivalent heating hours (H_{eh}) This calculation provides a reference for understanding heating requirements.

The numbers of equivalent heating hours (H eh) for the average, warmer and colder reference heating seasons can be found in Annex C.

Calculation of reference SAEFh on

The reference SAEFh on is determined as follows:

The heating load of a building at a specific temperature $ T_j $, denoted as $ P_h(T_j) $, is measured in kilowatts (kW) Additionally, $ h_j $ represents the number of bin hours that occur at the corresponding temperature $ T_j $.

AEFh (Tj) is the AEFh values of the appliance for the corresponding temperature Tj

The heating load Ph(Tj) can be determined according to Formula (10)

The AEFh and capacity values for each bin are calculated through interpolation based on the AEFh and capacity values at various part load conditions, specifically A, B, C, D, and occasionally E, F, and O This interpolation process utilizes the values from the two nearest part load conditions to determine accurate results.

The AEFh values and capacity values for part load conditions above D are extrapolated from the AEFh values and capacity values at part load conditions C and D

In case of the cold climate, an additional calculation point at −15°C (condition O) has to be taken for the capacity and AEFh

NOTE For bivalent appliances, distinction is made between SAEFh on and SAEFh net (see Annex D).

Procedures for the determination of GUEh / AEFh values

When the declared capacity of an appliance meets or falls below the required heating load, it operates at full capacity Therefore, the testing methods for full capacity, as specified in the relevant guidelines, should be applied.

When the declared capacity of an appliance exceeds the necessary heating load, it is essential to utilize the test methods at reduced capacity as specified in EN 12309-4:2014.

The numbers of equivalent heating hours (H eh) for the average, warmer and colder reference heating seasons can be found in Annex C

5.7 Calculation of reference SAEFh on

The reference SAEFh on is determined as follows:

The heating load of a building at a specific temperature $ T_j $, denoted as $ P_h(T_j) $, is measured in kilowatts (kW) Additionally, $ h_j $ represents the number of bin hours that occur at the corresponding temperature $ T_j $.

AEFh (Tj) is the AEFh values of the appliance for the corresponding temperature Tj

The heating load Ph(Tj) can be determined according to Formula (10)

The AEFh and capacity values for each bin are calculated through interpolation of the values at part load conditions A, B, C, D, and occasionally E, F, and O This interpolation process utilizes the AEFh and capacity values from the two nearest part load conditions.

The AEFh values and capacity values for part load conditions above D are extrapolated from the AEFh values and capacity values at part load conditions C and D

In case of the cold climate, an additional calculation point at −15°C (condition O) has to be taken for the capacity and AEFh

NOTE For bivalent appliances, distinction is made between SAEFh on and SAEFh net (see Annex D)

5.8 Procedures for the determination of GUEh / AEFh values

When the declared capacity of an appliance meets or falls below the required heating load, it operates at full capacity Therefore, the testing methods for full capacity, as specified in the relevant guidelines, should be applied.

If the declared capacity of an appliance is higher than the required heating load, the test methods at reduced capacity shall be used, as defined in EN 12309-4:2014

Calculation example for reference SGUEc and SAEFc

For an air to water appliance and for a variable outlet fan coil application, the following design parameters are given:

— Declared capacity at T designc (35 °C) = 15 kW

Table 1 in section 4.2.1 provides the outdoor air temperature, part load ratio, and indoor heat exchanger outlet water temperature, which are essential for calculating the cooling load using Formula (3) Additionally, GUEc and AEFc values are obtained through tests conducted in accordance with EN 12309-4:2014, as detailed in Table A.1.

Table A.1 — Data for GUEc and AEFc

Outdoor air temperature Part load ratio Indoor heat exchanger outlet water temperature

Cooling load GUEc AEFc °C % °C kW kW/kW kW/kW

The BIN calculation is detailed in Table A.2, with columns (A), (B), and (C) sourced from Table 2 For each BIN, the cooling load (D) is determined using Formula (1) and Formula (3) The values for GUEc (E) and AEFc (F) are calculated based on sections 4.3 and 4.6, utilizing the bold values from Table A.1 The cooling demand (G) is computed as \$G = fon \times (C) \times (D)\$, while the gas energy input (H) is derived from \$H = \frac{G}{E}\$ and the electricity input (I) from \$I = \frac{G}{F}\$ Additionally, SGUEc and SAEFcon can be obtained from the total values (J), (K), and (L).

SAEFcon = (J) / (L) = 13,5 The reference annual cooling demand (Q refc) is calculated according to Formula (5):

The measured power consumption in thermostat off, standby and off mode is 0,050 kW, 0,025 kW and 0 kW, respectively

Finally, SAEFc is calculated according to Formula (4):

SAEFc = 5 250 kWh / (5 250 kWh / 13,5 + 0,050 kW x 221 h + 0,025 kW x 2 142 h + 0 kW x 5 088 h) = 11,6

Table A.2 — BIN calculation for SGUE c and SAEF c on

BIN # Outdoor temp, air hours hj BIN Pc(Tj) GUE c AEF c Cooling demand Gas energy input

Table A.2 — BIN calculation for SGUE c and SAEF c on

BIN # Outdoor temp, air hours hj BIN Pc(Tj) GUE c AEF c Cooling demand Gas energy input

Calculation example for reference SGUEh , SAEFh and SPERh

For a monovalent air to water appliance, for a variable outlet fan coil application and for the average climate, the following design parameters are given:

— Declared capacity at T designh (−10°C) = 35 kW

Table 8 provides the outdoor air temperature, part load ratio, and indoor heat exchanger outlet water temperature, which are essential for determining the heating load The heating load is then calculated using Formula (10) along with GUEh.

AEFh are determined by tests according to EN 12309-4:2014 (see Table B.1)

Table B.1 — Data for GUEh and AEFh

Outdoor air temperature Part load ratio Indoor heat exchanger outlet water temperature

Heating load GUEh AEFh °C % °C kW kW/kW kW/kW

The BIN calculation is detailed in Table B.2, with columns (A), (B), and (C) sourced from Table 29 For each BIN, the heating load (D) is determined using Formula (7) and Formula (10) The values for GUEh (E) and AEFh (F) are calculated based on sections 5.4 and 5.7, utilizing the bolded values from Table B.1 The heating demand (G) is computed as (C) multiplied by (D), while the gas energy input (H) is derived from (G) divided by (E), and the electricity input (I) is calculated as (G) divided by (F) Additionally, SGUEh and SAEFh can be obtained from the total values (J), (K), and (L).

SAEFh on = (J) / (L) = 40,4 The reference annual heating demand (Q refh) is calculated according to Formula (12):

The measured power consumption in thermostat off, standby and off mode is 0,050 kW, 0,025 kW and 0 kW, respectively

SAEFh is calculated according to Formula (11):

SAEFh = 72 310 kWh / (72 310 kWh / 40,4 + 0,050 kW x 179 h + 0,025 kW x 0 h + 0 kW x 3 671 h) = 40,2

Finally, SPERh is calculated according to Formula (8):

Table B.2 — BIN calculation for SGUEh and SAEFh on

BIN # Outdoor temp,air hours hjBIN Ph(Tj) GUEh AEFh Heating demand Gas energy input

Finally, SPERh is calculated according to Formula (8):

Table B.2 — BIN calculation for SGUEh and SAEFh on

BIN # Outdoor temp,air hours hjBIN Ph(Tj) GUEh AEFh Heating demand Gas energy input

Number of hours in thermostat off mode, stand-by mode and off mode for reference SAEFc and SAEFh calculation

Table C.1 — Number of hours used for calculation of reference SAEFc

C Difference (A-B) = hours for the reference cooling season, of which: 3 672 3 672

F Difference (C-D-E) = Active mode hours without setback correction 1 309 1 309

H Sum (D+G) = Thermostat off hours corrected for setback impact (H TO ) 576 576

I Difference (F-G) = (or F x 73 %) = Active mode hours corrected for setback impact 954 954

J Equivalent active hours for cooling (H ec ) 350 350

K Fraction of bin hours during which the appliance is active in cooling mode (f on ) = J / I 36 % 36 %

Table C.2 — Number of hours used for calculation of reference SAEFh for reference heating season

Hours definition Explanation Heating only Reversible

A Total hours per year 365 d, 24 h per day 8 760 8 760

B Off mode (H OFF ) May until September, 24 h per day 3 672 0

C A-B Hours of reference heating season 212 d, 24 h per day 5 088 5 088

D -thermostat off (H TO ) Determined by simulation (all conditions in Oct-Apr where temperature equals 16° or higher)

G C-D-E Active mode hours Appliance has to reach or maintain a temperature set point

The appliance may switch between operational and not operational

B Off mode (H OFF ) May until September, 24hours per day 4 416 0

Determined by simulation (all conditions in Oct-Apr where temperature equals 16° or higher)

Appliance has to reach or maintain a temperature set point

Calculation of the reference seasonal performance in heating mode for bivalent appliances

Tiêu đề	Gas-fired sorption appliances for heating and/or cooling with a net heat input not exceeding 70 kW part 6: Calculation of seasonal performances
Trường học	British Standards Institution
Chuyên ngành	Standards
Thể loại	standard
Năm xuất bản	2014
Thành phố	Brussels

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