scholarly journals COVID 19 vaccine distribution solution to the last mile challenge: experimental and simulation studies of ultra-low temperature refrigeration system

2021 ◽  
Author(s):  
Jian Sun ◽  
Mingkan Zhang ◽  
Anthony Gehl ◽  
Brian Fricke ◽  
Kashif Nawaz ◽  
...  
Keyword(s):  
Low Temperature ◽  
Simulation Studies ◽  
Refrigeration System ◽  
Distribution Solution ◽  
Last Mile ◽  
Low Temperature Refrigeration ◽  
Vaccine Distribution

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.

Feasibility of air cycle systems for low-temperature refrigeration applications with heat recovery

2003 ◽  
Vol 217 (3) ◽  
pp. 267-273 ◽  
Author(s):  
N J Williamson ◽  
P K Bansal
Keyword(s):  
Low Temperature ◽  
Heat Exchangers ◽  
Heat Recovery ◽  
Cooling System ◽  
Refrigeration System ◽  
Cycle Systems ◽  
Consistent Basis ◽  
Low Temperature Refrigeration ◽  
Vapour Compression ◽  
Compressor Efficiency

In this paper the viability of an air cycle refrigeration system (Joule cycle) is investigated for a moderately low-temperature cooling system with heat recovery. The goal is to determine the best possible cycle configuration of heat exchangers and turbomachinery components for this particular application, and then to determine whether it can compete with a conventional vapour compression system. Simple models were developed for each cycle configuration, and the results were compared with each other on a consistent basis. The sensitivity of the system to heat exchanger effectiveness and expander and compressor efficiency was determined, and contours were plotted.

scholarly journals Thermodynamic Analysis of a Combined Single Effect Vapour Absorption System and tc-CO2 Compression Refrigeration System

2021 ◽  
Vol 2 (2) ◽  
pp. 87-98
Author(s):  
Abhishek Verma ◽  
S. C. Kaushik ◽  
S. K. Tyagi
Keyword(s):  
Low Temperature ◽  
Waste Heat ◽  
Electricity Consumption ◽  
Combined Cycle ◽  
Refrigeration System ◽  
Absorption System ◽  
Combined System ◽  
Single Effect ◽  
Exergetic Analysis ◽  
Low Temperature Refrigeration

Transcritical CO2 refrigeration system is coupled with the single effect vapour absorption with LiBr-water as a working pair having an objective to enhance the performance of low temperature transcritical refrigeration system while using natural working pair and to reduce the electricity consumption to produce low temperature refrigeration. The high grade waste heat rejected in the gas cooler of tc-CO2 compression refrigeration system (TCRS) is utilized to run the single effect vapour absorption system (SEVAR) to enhance the energy efficiency of the system. The gas cooler in the transcritical CO2 system is having heat energy at high temperature and pressure, which is utilized to run the vapour absorption system, while the other refrigerant heat exchanger provides subcooling to further enhance the performance. The combined cycle can provide refrigeration temperature at different levels, to use it for different applications. Energetic and exergetic analysis have been done to analyze the combined system to compute the performance parameters and the irreversibilities occurring in different components to further increase the performance. The combined system is optimized for various heat rejection and refrigeration temperatures. The COP of the combined system has been enhanced by to 24.88% while the enhancement in exergetic efficiency (ηex) is observed as 10.14% respectively over tradition transcritical CO2 compression refrigeration system, with -10°C as an evaporation (TCRS cooling) temperature and exit temperature of gas cooler T4 being 40°C. Doi: 10.28991/HIJ-2021-02-02-02 Full Text: PDF

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

Energy and Exergy Analysis of Cascade Refrigeration System Using MC22 and MC134 on HTC, R404A and R502 on LTC

2021 ◽  
Vol 80 (1) ◽  
pp. 73-83
Author(s):  
Hendri ◽  
Roswati Nurhasanah ◽  
Prayudi ◽  
Suhengki
Keyword(s):  
Low Temperature ◽  
Exergy Analysis ◽  
Refrigeration System ◽  
Low Temperature Storage ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Cascade Refrigeration System ◽  
Cascade Refrigeration ◽  
Better Than ◽  
Temperature Storage

Low temperature storage with a single refrigeration system only stable up to 228 K temperature. The purpose of this study is to develop a low temperature cool storage with cascade refrigeration system, with hydrocarbon refrigerants in terms of energy and exergy analysis. Experimental research in laboratories using refrigerant hydrocarbon MC22 and MC134 on the hight temperature circuit, and R404A and R502 using on low temperature circuit. Condenser heat exchanger using a type of exchanger plate. Resulting from this research, obtained that result the MC22/R404A, MC22/R502 and MC134/R404A refrigerant pair can reach a temperature of 220 K. The MC22/R404A refrigerant pair has god performance, COP, total loss exergy, and exergy efficiency is better than MC22/R502, and MC134/R04A refrigerant pairs.

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