MIL-PRF-12574M
0
to the interior of the calorimeter to maintain a minimum of 60
F
0
and a maximum of 100 F temperature difference between the interior
and exterior of the calorimeter.
g. The test shall be considered concluded when eight
consecutive half-hourly readings indicate that:
1.
The ambient temperature has been maintained constant
+20F.
within
2. The temperature inside the calorimeter has been
+ 10F.
maintained constant within
0
h. The overall heat leakage coefficient U (Btu/hr/
F) of the
calorimeter is given by:
U
=
H1
(T 1 - T 2)
H1 = Sum of all electrical heat energies added to the
calorimeter,
Btu/hr.
T1 = Average interior temperature of the calorimeter,
(100 0F to 155 0F).
T2 = Average ambient temperature, (T 1 - T 2) shall be in the
range of 60 0F to 100 0F.
i. The test calorimeter shall not be used unless a heat leakage
coefficient no greater than 25 Btu/hr/ 0F is obtained.
Capacity test (0 0F). The capacity of the refrigeration
4.3.2.3.2
unit for low temperature shall be verified to be no less than 5,000
Btu/hr using the method described below. Recorded data shall be
required and shall include all specified temperature readings,
electrical heat input, suction and discharge pressures, and
complete calculations. All panels and doors of the refrigeration
unit shall be in the closed position.
a.
All accessories and appurtenances shall be in their proper
place.
b. Thermocouples, shielded from the effects of radiant heat,
shall be installed in the air streams entering the evaporator and
leaving the evaporator section.
c. Shielded thermocouples shall be located at the approximate
center of four equal areas of the condenser face. The condenser
inlet temperature will be taken as the average of these four
temperatures.
d. Recording pressure gages shall be used for the compressor
suction and discharge pressures.
12
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