Comparative analysis of thermodynamic performance of CO 2 cascade refrigeration system assisted with expander and mechanical subcooling

2019 ◽  
Author(s):  
Zhili Sun ◽  
Qifan Wang ◽  
Dandan Su ◽  
Shengchun Liu ◽  
Baomin Dai
Keyword(s):  
Comparative Analysis ◽  
Refrigeration System ◽  
Thermodynamic Performance ◽  
Cascade Refrigeration System ◽  
Cascade Refrigeration

Analysis of Thermodynamic Performance in NH3/CO2 Cascade Refrigeration System

2013 ◽  
Vol 860-863 ◽  
pp. 1484-1488
Author(s):  
Rui Duan ◽  
Guo Min Cui ◽  
Qun Zhi Zhu
Keyword(s):  
Refrigeration System ◽  
Thermodynamic Performance ◽  
Cascade Refrigeration System ◽  
Cascade Refrigeration

The advantage and application of NH3/CO2 cascade refrigeration system were analyzed . The principle and composition of cascade refrigeration system were outlined . The cascade refrigeration system using NH3 /CO2 as refrigerant were studied theoretically and the COP were calculated .

Energy and exergy analysis of a subcritical cascade refrigeration system with internal heat exchangers using environmentally-friendly refrigerants

2020 ◽  
pp. 1-33
Author(s):  
Cenker Aktemur ◽  
Ilhan Tekin Öztürk
Keyword(s):  
Heat Exchangers ◽  
Internal Heat ◽  
Exergy Efficiency ◽  
Refrigeration System ◽  
Evaporator Temperature ◽  
Discharge Temperature ◽  
Thermodynamic Performance ◽  
Condenser Temperature ◽  
Cascade Refrigeration System ◽  
Cascade Refrigeration

Abstract This study focuses on a thermodynamic performance analysis of a subcritical cascade refrigeration system (CRS) with internal heat exchangers (IHXs) using R41/R601, R41/R602A, and R41/cyclopentane as refrigerant pairs. The effect of evaporator temperature (Tev), condenser temperature (Tcond) and temperature difference in cascade heat exchanger (ΔTCHX) on examined performance parameters are investigated. Each performance parameter is scrutinized by an optimum LTC condenser temperature. The operating parameters have some implications on the overall thermodynamic performance of the system. A change of 10°C in the Tev and Tcond affects the performance of the system by approximately +26% and −8%, respectively. Moreover, a variation of 1°C in the ΔTCHX reduces the performance of the system by about 2%. The effect of IHXs on the system has some interesting results. The COP and exergy efficiency values of the system using R41/cyclopentane tend to constantly decrease by nearly 4.05%. Although not as much as R41/cyclopentane, there is also a slight drop in the performance of other refrigerant pairs. The discharge temperature in LTC and HTC compressors exceeds 120°C for low-temperature refrigeration requirements, which is highly undesirable. Furthermore, the top priority components for the system improvement are HTC condenser, HTC compressor, and CHX. The refrigerant pairs with the thermodynamic performance from best to worst are R41/R601, R41/cyclopentane, and R41/R602A, respectively. Finally, the COP and exergy efficiency values of the modeled system are 10.40% higher and 3.06% lower, respectively, compared to current models in the literature.

Thermodynamic performance evaluation of a cascade refrigeration system with mixed refrigerants: R744/R1270, R744/R717 and R744/RE170

2019 ◽  
Vol 106 ◽  
pp. 201-212 ◽  
Author(s):  
Luiz Henrique Parolin Massuchetto ◽  
Raiza Barcelos Corrêa do Nascimento ◽  
Stella Maia Rocha de Carvalho ◽  
Hugo Valença de Araújo ◽  
José Vicente Hallak d'Angelo
Keyword(s):  
Performance Evaluation ◽  
Refrigeration System ◽  
Thermodynamic Performance ◽  
Cascade Refrigeration System ◽  
Cascade Refrigeration

scholarly journals Comparative analysis of a cooling systems working on an environmentally friendly refrigerants

2021 ◽  
pp. 32-40
Author(s):  
Adam RUCIŃSKI ◽  
Mateusz DALBA ◽  
Rafał LASKOWSKI
Keyword(s):  
Carbon Dioxide ◽  
Adverse Effect ◽  
Comparative Analysis ◽  
Operating Parameters ◽  
Meat Processing ◽  
Refrigeration System ◽  
Cooling Systems ◽  
Cascade Refrigeration System ◽  
Polish Law ◽  
Cascade Refrigeration

The paper treats with refrigerants which affect on excessive heating of atmosphere. They are in group offluorinated greenhouse gases which are regulated by European and polish law. The main aim is to lower their amount in industry leading to overall removal from use. We present possible way to design refrigeration system lowering their adverse effect on natural environment. So three options of cooling systems are analyzed: one-stage refrigeration system working with R449A, cascade refrigeration system with R744 (carbon dioxide)/ R134a and R717 (ammonia) refrigeration plant. Due to the nowadays raising use of the cascade systems, an analysis of the operating parameters of such installation was carried out with considering the cascade heat exchanger as a condenser/evaporator. The installations concerned are three alternative offers for meat processing manufactory. A thermal balance was prepared for chambers located in building and the operating parameters of the installation were assumed. The equipment corresponding to the required cooling capacities were selected.

The Comparative Analysis of R22 and R134a Applied in a Five-Stage Auto-Cascade Refrigeration System

2013 ◽  
Vol 291-294 ◽  
pp. 1740-1745
Author(s):  
Wei Zhao ◽  
Rui Xi Liu ◽  
Hai Dong Zhang ◽  
Hua Zhang ◽  
Shu Chun Zhang
Keyword(s):  
Comparative Analysis ◽  
High Temperature ◽  
Refrigeration System ◽  
Discharge Temperature ◽  
Cascade Refrigeration System ◽  
High Temperature Stage ◽  
Cascade Refrigeration

The mixed refrigerants R22/R23/R14/R740/R728 and R134a/R23/R14/R740/R728 are used in a five-stage auto-cascade refrigeration system for study in this paper. Through theoretic comparison of high temperature stage refrigerant R22 and R134a and repeated experiments we can get the results that the discharge temperature of the refrigerant R134a can be effectively controlled and a lower refrigeration temperature can be got than the refrigerant R22.

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