Energy, Exergy and Sustainability Analysis of Two-stage Vapour Compression Refrigeration System

Abstract

In this paper comparative analysis of R152a, R600, R600a, R410a, R290, R1234yf, R404a and R134a as refrigerants in two stage vapour compression refrigeration system has been done on the basis of energetic and exergetic performance. Performance parameters such as entropy generations, COP, exergetic efficiency, sustainability index were investigated at different ambient condition. It was found that both energy and exergy efficiencies of R134a is 8.97% and 5.38% lower than R152a and R600 respectively at -50 o C evaporating and 45 o C condensing temperatures. It was also observed that Irreversibility was minimal at higher evaporating temperatures and condenser was responsible for highest irreversibility or losses in two stage vapour compression refrigeration system. Sustainability index for R152a (1.96) was highest compared to other refrigerants.

A Review on Energy and Exergy Analysis of Two-Stage Vapour Compression Refrigeration System

“…The e®ect of evaporator temperature on COP of two-stage VCR system using various refrigerants has been demonstrated in Fig. 3 following the work of Chopra et al 2 and Khan et al 16 The¯gure shows that COP increases with the increase in evaporator temperature. This is due to the fact that pressure ratio across each stage decreases with evaporator temperature and this results in increase in COP of the system.…”

“…The e®ect of condenser temperature on exergy loss for a two-stage VCR system using various refrigerants has been demonstrated in Fig. 5 based on the results of Chandrasekharan 6 and Chopra et al 2 It can be observed from the¯gure that with the increase in condenser temperature, exergy destruction or loss increases and the loss is more with R290 compared to R600a and 134a.…”

“…In such cases, either multi-stage systems or cascade refrigeration systems are used in practice. Chopra et al 2 pointed out that COP and exergetic e±ciency are the two main performance parameters of refrigeration systems. COP can be enhanced either by minimizing power consumption or by increasing the refrigerating e®ect.…”

The Use of the E-Learnig Platform in the Assessment of Student Knowledge in Cmu

“…Within the above mentioned chapters to the students are introduced information regarding international Current Legislation and refrigerant selection. The main resulting aspects are as below [2], [3], [4], [5], [6], [7], [8] and [9]. The ozone layer is of major importance for the Earth's surface and people's health.…”

Evaluation on Expressions for Optimum Intermediate Condition of Two-Stage Vapor Compression Refrigeration Cycle

“…The results show that inter-stage pressure should be more considered in the areas with higher daily temperature. Two-stages VC refrigeration cycle has been analysed by using energy, exergy and sustainability concept [5]. Multistage VC refrigeration cycle has been optimized using general staging model [6].…”