Division Definitions related to the calculation method for comfort chillers, air conditioners and heat pumps

‘reference design conditions’ means the combination of the ‘reference design temperature’, the maximum ‘bivalent temperature’ and the maximum ‘operation limit temperature’, as set out in Annex III, Table 24;

‘reference design temperature’ means the ‘outdoor temperature’ for either cooling (T_design,c ) or heating (T_design,h ) as described in Annex III, Table 24, at which the ‘part load ratio’ is equal to 1 and which varies according to the cooling or heating season, expressed in degrees Celsius;

‘bivalent temperature’ (T_biv ) means the outdoor temperature (T_j ) declared by the manufacturer at which the declared heating capacity equals the part load for heating and below which the declared heating capacity has to be supplemented with electric back-up heater capacity in order to meet the part load for heating, expressed in degrees Celsius;

‘operation limit temperature’ (T_ol ) means the outdoor temperature declared by the manufacturer for heating, below which the heat pump will not be able to deliver any heating capacity and the declared heating capacity is equal to zero, expressed in degrees Celsius;

‘part load ratio’ (pl(T_j )) means the ‘outdoor temperature’ minus 16 °C, divided by the ‘reference design temperature’ minus 16 °C, for either space cooling or space heating;

‘season’ means a set of ambient conditions, designated as either a heating season or a cooling season, describing per bin the combination of outdoor temperatures and bin hours pertaining to that season;

‘part load for heating’ (Ph(T_j )) means the heating load at a specific outdoor temperature, calculated as the design heating load multiplied by the part load ratio and expressed in kW;

‘part load for cooling’ (Pc(T_j )) means the cooling load at a specific outdoor temperature, calculated as the design cooling load multiplied by the part load ratio and expressed in kW;

‘seasonal energy efficiency ratio’ (SEER) is the overall energy efficiency ratio of the air conditioner or comfort chiller, representative for the cooling season, calculated as the ‘reference annual cooling demand’ divided by the ‘annual energy consumption for cooling’;

‘seasonal coefficient of performance’ (SCOP) is the overall coefficient of performance of a heat pump using electricity, representative of the heating season, calculated as the reference annual heating demand divided by the ‘annual energy consumption for heating’;

‘reference annual cooling demand’ (Q_C ) means the reference cooling demand to be used as basis for calculation of SEER and calculated as the product of the design cooling load (P_design,c ) and the equivalent active mode hours for cooling (H_CE), expressed in kWh;

‘reference annual heating demand’ (Q_H ) means the reference heating demand, and pertaining to a designated heating season, to be used as basis for calculation of SCOP and calculated as the product of the design heating load (P_design,h ) and the equivalent active mode hours for heating (H_HE ), expressed in kWh;

‘annual energy consumption for cooling’ (Q_CE ) means the energy consumption required to meet the ‘reference annual cooling demand’ and is calculated as the ‘reference annual cooling demand’ divided by the ‘active mode seasonal energy efficiency ratio’ (SEER_on ) and the electricity consumption of the unit for thermostat-off, standby, off and crankcase heater mode during the cooling season, expressed in kWh;

‘annual energy consumption for heating’ (Q_HE ) means the energy consumption required to meet the ‘reference annual heating demand’ pertaining to a designated heating season, and is calculated as the ‘reference annual heating demand’ divided by the ‘active mode seasonal coefficient of performance’ (SCOP_on ) and the electricity consumption of the unit for thermostat-off, standby, off and crankcase heater mode during the heating season expressed in kWh;

‘equivalent active mode hours for cooling’ (H_CE ) means the assumed annual number of hours the unit must provide the ‘design cooling load’ (P_design,c ) in order to satisfy the ‘reference annual cooling demand’, expressed in hours;

‘equivalent active mode hours for heating’ (H_HE ) means the assumed annual number of hours a heat pump air heater has to provide the design heating load to satisfy the reference annual heating demand, expressed in hours;

‘active mode seasonal energy efficiency ratio’ (SEER_on ) means the average energy efficiency ratio of the unit in active mode for the cooling function, constructed from part load and bin-specific energy efficiency ratios (EER_bin (T_j )) and weighted by the bin hours the bin condition occurs;

‘active mode seasonal coefficient of performance’ (SCOP_on ) means the average coefficient of performance of the heat pump in active mode, for the heating season, constructed from the part load, electric back up heating capacity (where required) and bin-specific coefficients of performance (COP_bin (T_j )) and weighted by the bin hours the bin condition occurs;

‘bin-specific coefficient of performance’ (COP_bin (T_j )) means the coefficient of performance of the heat pump for every bin_j with outdoor temperature (T_j ) in a season, derived from the part load, declared capacity and declared coefficient of performance (COP_d (T_j ) and calculated for other bins through inter/extrapolation, when necessary corrected by the applicable degradation coefficient;

‘bin-specific energy efficiency ratio’ (EER_bin (T_j )) means the energy efficiency ratio specific for every bin_j with outdoor temperature (T_j ) in a season, derived from the part load, declared capacity and declared energy efficiency ratio (EER_d (T_j )) and calculated for other bins through inter/extrapolation, when necessary corrected by the applicable degradation coefficient;

‘declared heating capacity’ (Pdh(T_j )) means the heating capacity of the vapour compression cycle of a heat pump, pertaining to an outdoor temperature (T_j ) and indoor temperature (T_in ), as declared by the manufacturer, expressed in kW;

‘declared cooling capacity’ (Pdc(T_j )) means the cooling capacity of the vapour compression cycle of the air conditioner or comfort chiller, pertaining to an outdoor temperature (T_j ) and indoor temperature (T_in ), as declared by the manufacturer, expressed in kW;

‘design heating load’ (P_design,h ) means the heating load applied to a heat pump at the reference design temperature, whereby the design heating load (P_design,h ) is equal to the part load for heating with outdoor temperature (T_j ) equal to reference design temperature for heating (T_design,h ), expressed in kW;

‘design cooling load’ (P_design,c ) means the cooling load applied to a comfort chiller or air conditioner at the reference design conditions, whereby the design cooling load (P_design,c ) is equal to declared cooling capacity at outdoor temperature (T_j ) equal to reference design temperature for cooling (T_design,c ), expressed in kW

‘declared coefficient of performance’ (COP_d (T_j )) means the coefficient of performance at a limited number of specified bins (j) with outdoor temperature (T_j );

‘declared energy efficiency ratio’ (EER_d (T_j ) means the energy efficiency ratio at a limited number of specified bins (j) with outdoor temperature (T_j );

‘electric back-up heating capacity’ (elbu(T_j )) is the heating capacity of a real or assumed supplementary heater with a COP of 1 that supplements the declared heating capacity (Pdh(T_j )) in order to meet the part load for heating (Ph(T_j )) in case Pdh(T_j ) is less than Ph(T_j ), for the outdoor temperature (T_j ), expressed in kW;

‘capacity ratio’ means the part load for heating (P_h (T_j )) divided by the declared heating capacity (P_dh (T_j )) or the part load for cooling (P_c (T_j )) divided by the declared cooling capacity (P_dc (T_j ));