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Extra info for Copeland Refrigeration Manual Part 1: Fundamentals of Refrigeration
EFFECT OF PRESSURE DROP IN SUCTION LINE The effect of pressure loss in the suction line is similar to pressure drop in the evaporator. Since pressure drop in the suction line does not result in a corresponding decrease in the refrigerant evaporating temperature in the evaporator. Pressure drop in the suction line can be extremely detrimental to system capacity. Suction lines must be sized to prevent excessive pressure losses. Table 3-2 shows the capacity loss for a typical 7-1/2 HP compressor as the result of suction line pressure drop.
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Since each stage of compression then is at a much lower compression ratio, the compressor efficiency is greatly increased. The temperature of the refrigerant vapor leaving the first stage and entering the second stage may be high due to the heat of compression. This can result in overheating the second stage cylinders and valves. To prevent compressor damage, saturated refrigerant must be injected between stages to properly cool the compressor. EFFECT OF PRESSURE DROP IN SUCTION LINE The effect of pressure loss in the suction line is similar to pressure drop in the evaporator.
Copeland Refrigeration Manual Part 1: Fundamentals of Refrigeration by copeland