BS ISO 916:2020 pdf download.Testing of refrigerating systems.
5.2.4 Absorbed power of ancillaries
The power absorbed by fans, pumps, agitators, heaters, and other associated ancillaries shall be subject to agreement.
5.2.5 Absorbed power of the entire system
The drive power of the entire system shall be subject to agreement.
5.2.6 Cooling water demand
The cooling water demand may be a subject of the technical warranties.
5.2.7? Coefficient? of? performance
The coefficient of performance, COP, may be subject to agreement instead of the power absorbed according to 5.2.3 to 5.2.5.
5.3 Operating conditions for technical warranties
5.3.1 General
The following shall be subject to agreement:
a) refrigerant designation;
b) condition of the heat-transfer medium when entering, e.g. the condenser, aftercooler, oil cooler (if provided).
5.3.2 Overall refrigerating capacity
The following shall be subject to agreement:
a) Pressure and temperature of the refrigerant
1) at the suction port of the compressor; and
2) at the outlet of the condenser or of the receiver or aftercooler, respectively.
5.3.3 Net or useful refrigerating capacity
The following shall be subject to agreement:
a) the condition of the cooled medium at the inlet and outlet of the evaporator or at two defined points of the cooled medium circuit; or
b) the condition of the cooled medium at the inlet or outlet of the evaporator or at a defined point of the cooled medium circuit as well as the corresponding mass flow.
The condition of the cooled medium does not only include its temperature but also its physical data.
6 Test preparation and procedure
6.1 The test shall be carried out with all values in steady-state condition and in addition particularly with the compressor and the motor at operating temperature.
6.2 Prior to any measurement, it shall be ensured that heat exchanger surfaces not in contact with the refrigerant are clean. This applies, for example, to the cooling water side of condensers and the secondary refrigerant side of the evaporator.
6.3 Readjustment of the system prior to measurements is permitted. During the actual test, only mutually agreed interventions are permitted.
6.4 The test shall he carried out at operating conditions complying as precisely as possible to those agreed in accordance with 53.
6.5 The steady-state condition must be proven over a sufficiently long time period, while the initial and the final values of all quantities relevant to the test shall be within previously agreed limits.
6.6 Values deviating strongly from the arithmetic mean of the readings are not taken into account.
6.7 Readings are acceptable as long as the steady-state condition can be maintained.
6.8 All measurements shall be carried out in accordance with applicable standards, e.g. ISO 5167 (all parts). The measuring instruments shall be chosen in accordance with Clause 7.
6.9 The refrigerating system under test shall be provided with the required connections for pressure and temperature measurements. These connections shall not impair the intended function of the system.
6.10 For measuring the overall refrigerating capacity it shall be ensured that the liquid refrigerant is free from bubbles downstream of the condenser or the aftercooler, respectively. Proper purging of the refrigerating system is additionally required.
6.11 Two consecutive measurement series shall be conducted.BS ISO 916 pdf download.