Refrigeration and Air Conditioning by A.R. Trott and T. Welch (Auth.)

By A.R. Trott and T. Welch (Auth.)

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By A.R. Trott and T. Welch (Auth.)

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A meshing lobe of the male rotor then compresses the pocket, and the gas is finally released at the opposite end, when the exhaust port is uncovered by the movement of the rotors. Sealing between the working parts is usually assisted by the injection of oil along the length of the barrels. This extra oil must be separated from the discharge gas, and is then cooled and filtered before returning to the lubrication circuit (see Chapter 5). 15 Twin-screw compressor. 16). Gas sealing at these surfaces is effected by injecting a small amount of the liquid refrigerant.

Refrigerants 29 No single fluid has all these properties, and meets the new environmental requirements, but this chapter will show the developments that are taking place in influencing the selection and choice of a refrigerant. 3 Ozone depletion potential The ozone layer in our upper atmosphere provides a filter for ultraviolet radiation, which can be harmful to our health. Research has found that the ozone layer is thinning, due to emissions into the atmosphere of chlorofluorocarbons (CFCs), halons and bromides.

1 General The purpose of the compressor in the vapour compression cycle is to accept the low-pressure dry gas from the evaporator and raise its pressure to that of the condenser. Compressors may be of the positive displacement or dynamic type. The general form of positive displacement compressor is the piston type, being adaptable in size, number of cylinders, speed and method of drive. 1). As the piston descends on the suction stroke, the internal pressure falls until it is lower than that in the suction inlet pipe, and the suction valve opens to admit gas from the evaporator.

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