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

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.

Sign in / Sign up

Export Citation Format

Share Document