MIL-PRF-44035B
opening of a calorimeter or other insulated structure.
b. A combined heat load of 3000 Btu/hr shall be impressed when
the thermostat is set at 00F and 4500 Btu/hr shall be impressed
when the thermostat is at the 350F setting.
c.
The refrigeration unit shall be operated 36 hours with
the thermostat set at 00F and 36 hours with the thermostat set at
350F. During this test, suction and discharge pressure, ambient
air, condenser air, and evaporator in and out air temperatures
shall be recorded on automatic recording instruments. Normal
maintenance shall be performed during this test and verification
shall be made that rated conditions are maintained during the 72-
hour period in an ambient temperature of 1100F.
4.3.2.3 Refrigeration capacity tests.
4.3.2.3.1 Calorimeter calibration. The calorimeter calibration
shall be run once prior to capacity tests to establish the
coefficient of heat leakage to be used for capacity calculation.
The coefficient of heat leakage shall not exceed 25 Btu/hr/ F and
the volume shall not be less than 70 cubic feet. A refrigeration
unit shall be bolted to the evaporator opening in the calorimeter
and the overall heat leakage shall be determined as follows:
a. An electric fan(s) of sufficient capacity to insure that no
uncirculated air pocket will exist, shall be installed inside the
calorimeter. The electrical energy of the fan motor shall be
measured by the same method used for the heating elements in
subparagraph c and this heat equivalent shall be added to other
sources of heat added to the calorimeter.
b. Four thermocouples, shielded from the effects of radiant
heat, shall be installed inside the calorimeter and positioned
within 6 inches of the ceiling and floor at two opposite corners.
The interior temperature shall be taken as the average of the
four thermocouples.
c. Heating elements shall be installed approximately in the
center of the calorimeter. Electrical heat input shall be
measured by a watt-hour meter with a scale increment of 0.1
kilowatt-hour or less.
d. Eight thermometers or thermocouples, shielded from the
effects of radiant heat, shall be installed approximately 18
inches from each corner of the calorimeter in the room where it
is placed. The ambient temperature shall be taken as an average
of these eight temperatures.
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