. Airborne radar. Airplanes; Guided missiles. MECHANICAL DESIGN AND PACKAGING Electronic Equipment Air to Air Heat Exchanger (a) OPEN RAM AIR COOLING. (b) PRESSURIZED AIR COOLING I Evaporation Equipment Case. of piujd Cooling Air - Supply Electronic Equipment n rr Air-Cooled Plate Ut Cooling Air Exit na ^ Cooling Fluid Equipment (c) PRESSURIZED, CONDUCTION OF HEAT TO AIR-COOLED PLATE (d) LIQUID COOLING (evaporative) Fig. 13-3 Cooling Schemes for Electronic Equipment. maximum allowable component temperature, it will have to be cooled before entering the equipment heat exchanger. Schemes b and c
. Airborne radar. Airplanes; Guided missiles. MECHANICAL DESIGN AND PACKAGING Electronic Equipment Air to Air Heat Exchanger (a) OPEN RAM AIR COOLING. (b) PRESSURIZED AIR COOLING I Evaporation Equipment Case. of piujd Cooling Air - Supply Electronic Equipment n rr Air-Cooled Plate Ut Cooling Air Exit na ^ Cooling Fluid Equipment (c) PRESSURIZED, CONDUCTION OF HEAT TO AIR-COOLED PLATE (d) LIQUID COOLING (evaporative) Fig. 13-3 Cooling Schemes for Electronic Equipment. maximum allowable component temperature, it will have to be cooled before entering the equipment heat exchanger. Schemes b and c are more critical than ^ in this respect. In Fig. 13-3d, which may also be pressurized, the internal heat is conducted to an enclosed tank of liquid. The evapora- tion of the liquid absorbs heat, preventing the sensitive components from experiencing temperatures greatly above the boiling temperature of the liquid. Cooling and temperature-control systems can operate in a transient or a steady state. If the thermal environment and internal heating remain constant for a sufficient time, a steady-state heat transfer condition is reached. The flow of thermal energy for this condition may be indicated as shown in Fig. 13-4. Cooling Fluid In Cooling Fluid Out Electronic Equipment Fig. 13-4 Steady-State Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Povejsil, Donald J. Princeton, N. J. , Van Nostrand
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Keywords: ., bookcentury1900, bookcollectionbiodiversit, booksubjectairplanes
