Abstract
Vapor compression cycle is mainly employed as a refrigeration cycle in the Air-Conditioning (AC) unit. In order to save energy, the Coefficient of Performance (COP) of the need to be improved. One of the potential solutions is to modify the system into multi-stages vapor compression cycle. The suitable intermediate pressure between the high and low pressures is one of the design issues. The present work deals with the investigation of an optimum intermediate pressure of two-stages vapor compression refrigeration cycle. Typical vapor compression cycle that is used in AC unit is taken into consideration. The used refrigerants are R134a. The governing equations have been developed for the systems. An inhouse program has been developed to solve the problem. COP, mass flow rate of the refrigerant and compressor power as a function of intermediate pressure are plotted. It was shown that there exists an optimum intermediate pressure for maximum COP. For refrigerant R134a, the proposed correlations need to be revised.
Highlights
To avoid the globe from global warming, many countries have released the target on reducing Greenhouse gas (GHG) emissions
It was shown that there exists an optimum intermediate pressure for maximum Coefficient of Performance (COP)
Increasing the energy efficient technology is extremely needed in the mitigation actions to reduce GHG emission
Summary
To avoid the globe from global warming, many countries have released the target on reducing Greenhouse gas (GHG) emissions. There are several works related to increasing energy efficiency of a vapor compression cycle such as using heat recovery technique [1,2], multi-stages cycle, etc. Purohit et al [5] reported the study on the effect of inter-stage pressure on the performance of a two stages refrigeration cycle using intercooler. Xuan [8] developed a general staging model to optimize multistage exo-reversible refrigeration system affected solely by internal irreversibilities Those studies show that multi-stage technology to optimize the vapor compression refrigeration cycle has come under scrutiny. The present work focuses on the investigation of optimum intermediate pressure of two-stage vapor compression refrigeration cycle. The literature shows that very limited studies reported the using of R134a in the optimization of multi-stage vapor compression refrigeration cycle. It can be seen that the component of the system consists of two compressors, condenser, flash cooler, and evaporator
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