Division Definitions related to condensing units

‘rated cooling capacity’ (P_A ) means the cooling capacity that the condensing unit enables the vapour compression cycle to reach, once connected to an evaporator and an expansion device, when operating at full load, and measured at standard rating conditions with the reference ambient temperature set at 32 °C, expressed in kW to two decimal places;

‘rated power input’ (D_A ) means the electrical power input needed by the condensing unit (including the compressor, the condenser fan(s) and possible auxiliaries) to reach the rated cooling capacity, expressed in kW to two decimal places;

‘rated coefficient of performance’ (COP_A ) means the rated cooling capacity, expressed in kW, divided by the rated power input, expressed in kW, expressed to two decimal places;

‘coefficients of performance COP_B, COP_C and COP_D’ mean the cooling capacity, expressed in kW, divided by the power input, expressed in kW, expressed to two decimal places at rating points B, C and D;

‘seasonal energy performance ratio’ (SEPR) is the efficiency ratio of a condensing unit for providing cooling at standard rating conditions, representative of the variations in load and ambient temperature throughout the year, and calculated as the ratio between annual cooling demand and annual electricity consumption, expressed to two decimal places;

‘annual cooling demand’ means the sum of each bin-specific cooling demand multiplied by the corresponding number of bin hours;

‘bin-specific cooling demand’ means the cooling demand for every bin in the year, calculated as the rated cooling capacity multiplied by the part load ratio, expressed in kW to two decimal places;

‘part load’ (Pc(T_j)) means the cooling load at a specific ambient temperature T_j, calculated as the full load multiplied by the part load ratio corresponding to the same ambient temperature T_j and expressed in kW at two decimal places;

‘part load ratio’ (PR(T_j)) at a specific ambient temperature T_j means the ambient temperature T_j minus 5 °C divided by the reference ambient temperature minus 5 °C, and — for medium temperature — multiplied by 0,4 and added to 0,6, and — for low temperature — multiplied by 0,2 and added to 0,8. For ambient temperatures higher than the reference ambient temperature, the part load ratio shall be 1. For ambient temperatures lower than 5 °C, the part load ratio shall be 0,6 for medium temperature and 0,8 for low temperature. The part load ratio can be expressed at three decimal places or in percentage, after multiplying by 100, at one decimal place;

‘annual electricity consumption’ is calculated as the sum of the ratios between each bin-specific cooling demand and the corresponding bin-specific coefficient of performance, multiplied by the corresponding number of bin hours;

‘ambient temperature’ means the dry bulb air temperature, expressed in degrees Celsius;

‘bin’ (bin_j ) means a combination of an ambient temperature T _j and bin hours h _j , as set out in Table 6 of Annex VI;

‘bin hours’ (h_j ) means the hours per year at which an ambient temperature occurs for each bin, as set out in Table 6 of Annex VI;

‘reference ambient temperature’ means the ambient temperature, expressed in degrees Celsius, at which the part load ratio is equal to 1. It is set at 32 °C;

‘bin-specific coefficient of performance’ (COP_j ) means the coefficient of performance for every bin in the year, derived from the part load, the declared cooling demand and declared coefficient of performance for specified bins, and calculated for other bins by linear interpolation, corrected where necessary by the degradation coefficient;

‘declared cooling demand’ means the cooling demand at a limited number of specified bins, and calculated as the rated cooling capacity multiplied by the corresponding part load ratio;

‘declared coefficient of performance’ means the coefficient of performance at a limited number of specified bins, and calculated as the declared cooling capacity divided by the declared power input;

‘declared cooling capacity’ means the cooling capacity which the unit delivers to meet the specific cooling demand at a limited number of specified bins, expressed in kW to two decimal places;

‘declared power input’ means the electrical power input needed by the condensing unit to meet the declared cooling capacity, expressed in kW to two decimal places;

‘degradation coefficient’ (Cdc) is set at 0,25 and means the measure of efficiency loss due to the possible on/off cycling of condensing units necessary to satisfy the required part load in case the unit's capacity control cannot unload to the required part load;

‘capacity control’ means the ability of a condensing unit to change its capacity by changing the volumetric flow rate of the refrigerant, to be indicated as ‘fixed’ if the unit cannot change its volumetric flow rate, ‘staged’ if the volumetric flow rate is changed or varied in series of not more than two steps, or ‘variable’ if the volumetric flow rate is changed or varied in series of three or more steps;