MIL-PRF-62259B
4.3.3 Operating requirements verification.
4.3.3.1 Heat transfer capacity test. To determine heat transfer capacity, the radiator shall
be connected to a test setup similar to that shown in figure 3 or figure 4. The air temperature
transducers shall not be more than 2 inches (in.) ((50.8 millimeter (mm)) from the core faces.
Inlet and outlet coolant temperatures shall be measured within six inches (152.4 mm) of the ports.
Air and coolant flow shall be measured at 25, 50, 75 and 100 percent of specified maximum air
flow. Tap water shall be used as the coolant and the flow into the core shall be free of entrapped
gases. Inlet coolant temperature shall be 180°F ± 5°F (82°C ± 3°C). The heat transfer capacity
shall be based on the difference between the inlet coolant temperature and the inlet air
temperature. To determine conformance to 3.3.1, the heat transfer capacity shall be measured on
the air side in terms of British thermal units (Btu's) (kilojoule (kJ)) per minute, at 80°F (27°C)
and 70 gal/min (4.4 L/s) water flow. Heat transfer values obtained from testing which are less
than those shown on figure 1 shall constitute failure of the test.
FIGURE 3. Test setup.
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