scholarly journals Novel Cascade Refrigeration Cycle for Cold Supply Chain of COVID-19 Vaccines at Ultra-Low Temperature -80°C Using Ethane (R170) Based Hydrocarbon Pair

2021 ◽  
Vol 09 (02) ◽  
pp. 309-336
Author(s):  
Tarek A. Mouneer ◽  
Abdelrahman M. Elshaer ◽  
Mohamed H. Aly
Keyword(s):  
Supply Chain ◽  
Low Temperature ◽  
Refrigeration Cycle ◽  
Cascade Refrigeration

Thermodynamic Analysis of a R32/CO2 Cascade Refrigeration Cycle

2013 ◽  
Vol 732-733 ◽  
pp. 527-530 ◽  
Author(s):  
Jian Xiao ◽  
Ying Fu Liu
Keyword(s):  
Low Temperature ◽  
Thermodynamic Analysis ◽  
Working Conditions ◽  
Temperature Difference ◽  
Refrigeration Cycle ◽  
Cascade Refrigeration

A R32/CO2 cascade refrigeration cycle was analyzed thermodynamically, the results show that: Under given working conditions, there exists the best condensing temperature of the low-temperature circuit to make the maximum COP of the cycle. The lower evaporating temperature is, the lower the best condensing temperature of the low-temperature circuit is. Under the same evaporating temperature, COP increases and mH/mL decreases along with condensing temperature decreasing, under the same condensing temperature, COP decreases and mH/mL increases along with condensing temperature decreasing. To reduce the temperature difference in the cascade-condenser can increase COP and decrease mH/mL.

Study on Energy Efficiency of a Low Temperature Refrigeration System

2011 ◽  
Vol 71-78 ◽  
pp. 292-295
Author(s):  
Lin Wang ◽  
Xiao Long Cui ◽  
Ying Ying Tan ◽  
Yu Wang
Keyword(s):  
Low Temperature ◽  
Mass Balance ◽  
Balance Equation ◽  
Total Mass ◽  
Cycle Performance ◽  
Refrigeration Cycle ◽  
Refrigeration System ◽  
Mass Balance Equation ◽  
Cascade Refrigeration ◽  
Low Temperature Refrigeration

Based on conservation of mass, total mass balance equation and component mass balance equation, mathematical models of thermodynamic for the auto cascade refrigeration cycle are established. Thermophysical properties in solving the governing equation are called from the NIST REFPROP7.0. Thermodynamic properties of the auto cascade refrigeration cycle using binary mixtures, namely, R170/R290, R23/R227ea, R116/R134a, R23/R134a, R170/R600a, R170/R600 and R170/R152a as refrigerants is evaluated. R170/R600a is selected for the low temperature refrigeration system, and the influences of cycle mole fraction, compression ratio and evaporating pressure on the cycle performance are analysed.

The Entropy Analysis on NH3/CO2 Cascade Refrigeration Cycle

2010 ◽  
Author(s):  
Yingbai Xie ◽  
Kuikui Cui ◽  
Luxiang Zong ◽  
Zhichao Wang
Keyword(s):  
Low Temperature ◽  
Entropy Production ◽  
Intermediate Temperature ◽  
Refrigeration Cycle ◽  
Total Entropy ◽  
Entropy Analysis ◽  
Minimization Method ◽  
Good Future ◽  
Cascade Refrigeration ◽  
Total Entropy Production

This paper introduces a cascade refrigeration cycle that uses natural refrigerants of CO2 and NH3 at low temperature. It introduces the character of CO2 and NH3, besides analyzes the cascade refrigeration cycle. The optimal intermediate temperature of NH3/CO2 cascade refrigeration cycle is determined by the entropy production minimization method. We analyze the four processes entropy production in both CO2 cycle (LT side) and NH3 cycle (HT side) and research how the total entropy production changes in the conditions of different T0, different TCL and different ΔT. We also find that in order to enhance the efficiency of NH3/CO2 cascade refrigeration cycle, it is necessary to reduce ΔT. It can be concluded that NH3/CO2 cascade refrigeration cycle has a good future.

The Study of the Effects of Refrigerant Fraction on Auto-Cascade Refrigeration System of Evaporation Temperature

2014 ◽  
Vol 889-890 ◽  
pp. 321-324
Author(s):  
Da Yu Zheng ◽  
Dan Li ◽  
Jia Zheng ◽  
Li Ping Gao ◽  
Yi Ming Zhang
Keyword(s):  
Experimental Study ◽  
Low Temperature ◽  
Refrigeration Cycle ◽  
Refrigeration System ◽  
Evaporation Temperature ◽  
Cycle System ◽  
Cascade Refrigeration System ◽  
Cascade Refrigeration ◽  
Relationship Of ◽  
Working Efficiency

Non-azeotropic auto-cascade refrigeration system utilizes various components of different boiling refrigerant to get low-temperature. With R22, R23 and R14 as a non-azeotropic refrigerant auto-cascade refrigeration cycle system. Through the experimental study of non-azeotropic refrigerant charging and the ratio between the amount of charge, to analyze the effect of these three refrigerants charging and relationship of the fraction on the whole refrigeration cycle refrigeration temperature. To improve overall non-azeotropic auto-cascade refrigeration systems working efficiency. So as to achieve the purpose of energy saving.

Irreversibility Analysis of a Vapor Compression Cascade Refrigeration Cycle

2008 ◽  
Author(s):  
Ali Kilicarslan ◽  
Norbert Mu¨ller
Keyword(s):  
Low Temperature ◽  
Alternative Energy ◽  
Working Fluid ◽  
Energy Sources ◽  
Temperature Cycle ◽  
Refrigeration Cycle ◽  
Evaporator Temperature ◽  
Temperature Cycles ◽  
Condenser Temperature ◽  
Cascade Refrigeration

Hydrocarbon based energy sources such as coal, oil and natural gas have been diminishing in an increasing speed. Instead of finding alternative energy sources, we have to use the available sources more effectively. By means of the irreversibility analysis, we can determine the factors or conditions that cause the inefficiencies in any energy system. In this study, irreversibility analysis of a compression cascade refrigeration cycle that consists of a high and low temperature cycles is presented. In the high temperature cycle, the refrigerants from different classes, namely R12 (CFC), R22 (HCFC), R134a (HFC) and R404a (Azeotropic) are selected as working fluids. In the low temperature cycle, R13 is only used as a working fluid. Irreversibility analysis of refrigerant pairs, namely R12-R13, R22-R13, R134a-R13, and R404a-R13 are carried out in a compression cascade refrigeration cycle by a computer code developed. The effects of evaporator temperature, condenser temperature, and the temperature difference between the saturation temperatures of the lower and higher temperature cycles in the heat exchanger (ΔT) and the polytropic efficiency on irreversibility of the system are investigated. The irreversibility of the cascade refrigeration cycle decreases as the evaporator temperature and polytropic efficiency increase for all of the refrigerant couples considered while the irreversibility increases with the increasing values of the condenser temperature and ΔT. In the whole ranges of evaporator temperature (−65°C / −45°C), condenser temperature (30–50°C), ΔT (2–16K) and polytropic efficiency (%50/%100), the refrigerant pair R12-R13 has the lowest values of irreversibilities while the pair R404a-R13 has the highest ones. At the lower condenser temperature (<30°C) and higher polytropic efficiencies (85%–95%), the refrigerant couples except for R404a-R13 have approximately the same values of irreversibility.

Thermodynamic analysis of auto-cascade refrigeration cycles, with and without ejector, for ultra low temperature freezing using a mixture of refrigerants R600a and R1150

2021 ◽  
pp. 117598
Author(s):  
Enrique Ángel Rodríguez-Jara ◽  
Francisco José Sánchez-de-la-Flor ◽  
José Antonio Expósito-Carrillo ◽  
José Manuel Salmerón-Lissén
Keyword(s):  
Low Temperature ◽  
Thermodynamic Analysis ◽  
Cascade Refrigeration

A novel low-temperature absorption–compression cascade refrigeration system

2015 ◽  
Vol 75 ◽  
pp. 504-512 ◽  
Author(s):  
Yingjie Xu ◽  
FuSheng Chen ◽  
Qin Wang ◽  
Xiaohong Han ◽  
Dahong Li ◽  
...  
Keyword(s):  
Low Temperature ◽  
Refrigeration System ◽  
Cascade Refrigeration System ◽  
Cascade Refrigeration
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