ANALYSIS OF NEW REGENERATIVE VAPOUR COMPRESSION REFRIGERATION SYSTEM USING EJECTOR

Abstract

In present study a mathematical model is developed in EES for a new regenerative vapour compression refrigerating system. The model is then used to determine the work of compressor, work of pump, refrigerating capacity of the system, thermal performance of the system and COP of the new regenerative vapour compression system using R134a and R152a as a refrigerant. And then this result is compare with basic vapour compression cycle.The basic purpose of using this cycle is to use the regenerative use of potential energy of ejector two phase expansion flow. which is going to lost in expansion valve. The new features of the process which are essential are: 1.The compression is done in two step and throttling is also done in two step. First compress in compressor and secondly in ejector. 2.Use a jet device as a second step compression and compressor a initial step, where Compression and throttling are combined. 3. The ratio of a working fluid at the first and second step of compression is controlled. In this proposed system, the compressor compresses the vapor only to 50-60% of the final pressure, while the additional compression is achieved by a jet device using the working fluid‘s internal potential energy of flow. Therefore, the amount of mechanical energy is significantly reduced required by a compressor , resulting in the increase of efficiency (either COP or EER). The novelty of the cycle is in the equipment and in the way the multistaging is accomplished. In this proposed system, approximately 50-60% of the final pressure is compress by the help of compressor. And the remaining compression is provided in a jet device called ejector using internal potential energy of the working fluid flow. Therefore, the amount of mechanical energy is significantly reduced Required by a compressor and a coefficient of performance (COP) can be theoretically increased by a ratio reaching 1.4-1.5.