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 TM 55-1905-219-14-8
4-28.
AIR CONDITIONING SYSTEM-MAINTENANCE INSTRUCTIONS (Continued).
(c) The liquid refrigerant, when passing through the orifice with the expansion valve, expands into the
cooling coils at a lower pressure than that on the inlet side of the valve. The reduction of pressure permits the
refrigerant to boil or vaporize at a low temperature, which it immediately begins to do by absorbing heat from
the air or other substance to be cooled. This heat flows into the cooling coil surface and then into the liquid,
which is at a lower temperature. The expanded liquid, as it continues to pass through the cooling coil,
continues to absorb heat until it is completely evaporated.
(d) Due to the pressure difference between the "high" and "low side" of the system, and also the
suction effect of the compressor, the gas thus produced is drawn through the suction line into the compressor
cylinder. The downstroke of the piston admits a cylinder full of gas through the suction valve, and then
compresses this gas on the upstroke, thereby raising its temperature and pressure. The compressed gas is
presented from re-entering the cylinder on its next downstroke by the compressor discharge valve. This hot
gas, under high pressure, then flows to the condenser. The compressor discharge valve, like the expansion
valve, is the other division between the "high side" and the "low side" of the system.
Gas Paths Through Compressor
4-830
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