(c)

The energy efficiency ratio EERPL(Tj) at part load conditions A, B, C, D is determined as explained below: In part load condition A (full load), the declared capacity of a unit is considered equal to the refrigeration load (PdesignR). In part load conditions B, C, D, there can be two possibilities: (i) If the declared capacity (DC) of a unit matches with the required refrigeration loads, the corresponding EERDC value of the unit is to be used. This may occur with variable capacity units. EERPL(TB,C or D) = EERDC (ii) If the declared capacity of a unit is higher than the required refrigeration load, the unit has to cycle on/off. This may occur with fixed capacity or variable capacity units. In such cases, a degradation coefficient (Cc) has to be used to calculate the corresponding EERPL value. Such calculation is explained below. (1) For fixed capacity units: In order to obtain a time averaged outlet temperature the inlet and outlet temperatures for the capacity test shall be determined using the equation below: toutlet,average = t inlet,capacity test + (toutlet,capacity test — tinlet,capacity test) * CR where: — t inlet,capacity test = evaporator water inlet temperature (for conditions B, C or D as set out in Regulation (EU) 2016/2281, Annex III, table 22 and 23) — t outlet,capacity test = evaporator water outlet temperature (for conditions B, C or D as set out in Regulation (EU) 2016/2281, Annex III, table 22 and 23) — t outlet,average = mean evaporator water average outlet temperature over an on/off cycle (for instance + 7 °C as set out in Regulation (EU) 2016/2281, Annex III, table 22 and 23) — CR = the capacity ratio, calculated as the refrigeration load (PR) divided by the refrigeration capacity (Pd) at the same operating condition, as follows: For determining toutlet,average an iterative procedure is required at all conditions (B, C, D) where the chiller refrigeration capacity (control step) is higher than the required refrigeration load. — Test at toutlet from Table 22 or 23 of Regulation (EU) 2016/2281 with the water flow rate as determined for tests at condition ‘A’ for chillers with a fixed water flow rate or with a fixed temperature difference for chillers with a variable flow rate; — Calculate CR; — Apply calculation for toutlet_average to calculate the corrected toutlet,capacity test at which the test shall be performed in order to obtain toutlet,average equal to the outlet temperature as defined in Tables 22 or 23 of Annex III of Regulation (EU) 2016/2281; — Retest with the corrected toutlet and the same water flow rate; — Recalculate CR; — Repeat previous steps until CR and toutlet,capacity test do not change any more. Then, for each part load conditions B, C, D the EERPL is calculated as follows: Text of image where: — EERDC is the EER corresponding to the declared capacity (DC) of the unit at the same temperature conditions as for part load conditions B, C, D; — Cc is the degradation coefficient for chillers for part load conditions B, C, D; — CR is the capacity ratio for part load conditions B, C, D. For chillers, the degradation due to the pressure equalization effect when the unit restarts can be considered as negligible. The only effect that will impact the EER at cycling is the remaining power input when the compressor is switched off. The electrical power input during the compressor off state of the unit is measured when the compressor is switched off for at least 10 min. The degradation coefficient Cc is determined for each part load ratio as follows: If Cc is not determined by test then the default degradation coefficient Cc is 0,9. (2) For variable capacity units: Determine the declared capacity and EERPL at the closest step or increment of the capacity control of the unit to reach the required refrigeration load. If this step does not allow reaching the required refrigeration load within +/- 10 % (e.g. between 9,9 kW and 8,1 kW for a required refrigeration load of 9 kW), determine the capacity and EERPL at the defined part load temperatures for the steps on either side of the required refrigeration load. The part load capacity and the EERPL at the required refrigeration load are then determined by linear interpolation between the results obtained from these two steps. If the smallest control step of the unit is higher than the required refrigeration load, the EERPL at the required part load ratio is calculated using the equation for fixed capacity units.