ISO 15042:2011 pdf free download – Multiple split-system air-conditioners and air-to-air heat pumps一Testing and rating for performance.
D.2 Calibrated room-type calorimeter
D.2.1 Heat leakage may be determined in either the indoor-side or outdoor-side compartment by the following method. All openings should be closed. Either compartment may be heated by electric heaters to a temperature of at least 11 °C above the surrounding ambient temperature. The ambient temperature should be maintained constant within ±1 °C outside all six enveloping surfaces of the compartment, including the separating partition. If the construction of the partition is identical to that of the other walls, the heat leakage through the partition may be determined on a proportional area basis.
D.2.2 For calibrating the heat leakage through the separating partition alone, the following procedure may be used. A test is carried out as described above. Then the temperature of the adjoining area on the other side of the separating partition is raised to equal the temperature in the heated compartment, thus eliminating heat leakage through the partition, while the 11 °C differential is maintained between the heated compartment and the ambient surrounding the other five enveloping surfaces.
The difference in heat input between the first test and second test determines the leakage through the partition alone.
D.2.3 For the outdoor-side compartment equipped with means for cooling, an alternative means of calibration may be to cool the compartment to a temperature at least 11 °C below the ambient temperature (on six sides) and carry out a similar analysis.
D.2.4 In addition to the two-room simultaneous method of determining capacities, the performance of the indoor room-side compartment shall be verified at least every six months using an industry standard cooling capacity calibrating device. A calibrating device may also be another equipment whose performance has been measured by the simultaneous indoor and outdoor measurement method at an accredited national test laboratory as part of an industry-wide cooling capacity verification programme.
D.3 Balanced ambient room-type calorimeter
D.3.1 The balanced ambient room-type calorimeter is shown in Figure D.2 and is based on the principle of maintaining the dry-bulb temperatures surrounding the particular compartment equal to the dry-bulb temperatures maintained within that compartment. If the ambient wet-bulb temperature is also maintained equal to that within the compartment, the vapour-proofing provisions of D.1.1O are not required.
D.3.2 The floor, ceiling and walls of the calorimeter compartments shall be spaced a sufficient distance away from the floor, ceiling and walls of the controlled areas in which the compartments are located in order to provide a uniform air temperature in the intervening space. It is recommended that this distance be at least 0,3 m. Means shall be provided to circulate the air within the surrounding space to prevent stratification.
D.3.3 Heat leakage through the separating partition shall be introduced into the heat balance calculation and may be calibrated in accordance with D.2.2 or may be calculated.
D.3.4 It is recommended that the floor, ceiling and walls of the calorimeter compartments be insulated so as to limit heat leakage (including radiation) to no more than 10 % of the test equipment’s capacity, for an 11 °C temperature difference, or 300 W for the same temperature difference, whichever is greater, as tested using the procedure given in D.3.2.