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regards The air receiver has a drain valve, safety valve, pressure switches and a discharge valve. It uses two pistons. Both stages are connected by vee-belts to the same motor with an advanced inverter. It turns out that, as long as P 2 >> P 1, the power savings more than repays the increased costs associated with buying a more expensive 2-stage compressor and the intercooler heat exchanger as well ! January 2014, Volume 2, Issue 1 JETIR (ISSN-2349-5162) JETIR1501025 Journal of Emerging Technologies and Innovative Research (JETIR) www.jetir.org 145 Design of Two Stage Vapour Compression Refrigeration System with Water Intercooler 1Pravin D. Dhakane, 2M.S.Joshi In a single stage compressor the air is compressed one time; in a two stage compressor the air is compressed twice for double the pressure. In a two-stage compressor, air is partially compressed using isentropic compression, and then cooled in a heat exchanger, called an intercooler. An intercooler is provided between first and second stage. The second stage compressor has three alternative pulleys to vary the pressure ratio between the two stages. is shown in thetable 4. In a multi-stage unit compressor, the air is compressed in succeeding cylinders, getting hotter and hotter along the way. The intercooler exit temperature is thereby increased, with two main consequences for engine operation: 1. 1) Piston 2) Piston Ring. A refrigerant system is provided with at least two sequential stages of compression. In the two-stage reciprocating air compressor, the air compresses two times. We use intercooler in 2 stage compressor to increase efficiency and reduced power consumption. Two Stage Air Compressor. The refrigerant flowing through the intercooler is cooled by a secondary fluid such as ambient air. what is more imporatant in intercooler design whether it is dew point below which air to be cooled or percetage of moisture to be removed. An intercooler is positioned intermediate the two stages. I hope this has piqued your interest. Experimental data of compressor with existing intercooler connected to the pipe line were taken as the reference for CFD analysis. The intercooler improves the compressor’s efficiency. The “ribbed” air lines between cylinders and into the tank on the following Husky compressor are an example of a basic intercooler. Reduced LP compressor surge margin due to decreased mass flow: The reduced intercooling means the HP compressor referred speed and hence referred flow are reduced by the higher inlet temperature. One uses for air compression from these pistons while other uses for pumping compressed air from one cylinder to the second cylinder. The main difference between a single and 2 stage air compressor is the number of times that air gets compressed between the inlet valve and tool nozzle. A vapor/liquid injection function is also provided for the refrigerant system. 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