Hybrid sorption-vapor compression cooling systems: A comprehensive overview

2021 ◽  
Vol 143 ◽  
pp. 110912
Author(s):  
Mohamed G. Gado ◽  
Shinichi Ookawara ◽  
Sameh Nada ◽  
Ibrahim I. El-Sharkawy
Keyword(s):  
Vapor Compression ◽  
Comprehensive Overview ◽  
Cooling Systems ◽  
Vapor Compression Cooling

scholarly journals SISTEM KONTROL SUHU PENYIMPAN BUAH-SAYUR PADA MESIN PENDINGIN TERMOELEKTRIK

2017 ◽  
Vol 3 (2) ◽  
Author(s):  
Rofan Aziz ◽  
Muh Tanwirul Afkar ◽  
Sunanto Sunanto ◽  
Karsid Karsid
Keyword(s):  
Control System ◽  
Temperature Control ◽  
Fruits And Vegetables ◽  
Coefficient Of Performance ◽  
Temperature Control System ◽  
Vapor Compression ◽  
Cooling Systems ◽  
High Coefficient ◽  
Conventional Cooling ◽  
Vapor Compression Cooling

Conventional cooling systems based on vapor compression have a high coefficient of performance (COP). However shortage of vapor compression cooling systems still using refrigerants that have detrimental effects on the environment. For that purpose, the research of fruit and vegetable storage machine using thermoelectric system TEC1-12706 with temperature control system using arduino. In this study the temperature in the cabin can be stable at 15° C and still feasible for use as a storage of fruits and vegetables.

Performance Enhancement of Solar Air Conditioners Using Hybrid Heat Rejection System

2019 ◽  
Author(s):  
Abdul Ahad Iqbal ◽  
Ali Al-Alili
Keyword(s):  
Air Conditioning ◽  
Cooling System ◽  
Vapor Compression ◽  
Summer Period ◽  
Cooling Systems ◽  
Hybrid Cooling ◽  
Vapor Compression Cooling ◽  
Air Conditioning Systems ◽  
Sorption Systems ◽  
Dry Cooling

Abstract The performance of air conditioning systems is highly dependent on the environmental conditions of the high pressure side, where heat is rejected to the environment. Air conditioning systems utilize dry cooling systems which often don’t provide adequate cooling during peak cooling periods, or wet cooling systems which consume a lot of water. In this study, a novel hybrid cooling system that can provide both wet and dry cooling was modelled in TRNSYS, and used to provide cooling to closed sorption air conditioning systems. The performance of these systems with the hybrid cooling system was compared to the performance of a standard vapor compression cooling system being cooled by a dry cooling system. The COPsol of the vapor compression cooling system exhibited a decrease of almost 26% during the summer period, whereas the COPsol of the sorption systems increased by around 30%. Similarly, the cooling capacity of the vapor compression cooling system dropped by almost 5%, and for the sorption systems, it increased by around 20% during the summer period.

scholarly journals Giant multiple caloric effects in charge transition ferrimagnet

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yoshihisa Kosugi ◽  
Masato Goto ◽  
Zhenhong Tan ◽  
Daisuke Kan ◽  
Masahiko Isobe ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Entropy Change ◽  
Vapor Compression ◽  
Cooling Systems ◽  
Environment Friendly ◽  
Temperature Changes ◽  
First Order ◽  
Vapor Compression Cooling ◽  
Future Technologies ◽  
Kbar Pressure

AbstractCaloric effects of solids can provide us with innovative refrigeration systems more efficient and environment-friendly than the widely-used conventional vapor-compression cooling systems. Exploring novel caloric materials is challenging but critically important in developing future technologies. Here we discovered that the quadruple perovskite structure ferrimagnet BiCu3Cr4O12 shows large multiple caloric effects at the first-order charge transition occurring around 190 K. Large latent heat and the corresponding isothermal entropy change, 28.2 J K−1 kg−1, can be utilized by applying both magnetic fields (a magnetocaloric effect) and pressure (a barocaloric effect). Adiabatic temperature changes reach 3.9 K for the 50 kOe magnetic field and 4.8 K for the 4.9 kbar pressure, and thus highly efficient thermal controls are achieved in multiple ways.

Optimized Refrigerant Flow Rate and Dimensions of the Ejector Employed in a Modified Ejector Vapor Compression System

2020 ◽  
Vol 28 (04) ◽  
pp. 2050038
Author(s):  
Dishant Sharma ◽  
Gulshan Sachdeva ◽  
Dinesh Kumar Saini
Keyword(s):  
Flow Rate ◽  
Cooling System ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Vapor Compression ◽  
Evaporator Temperature ◽  
Proposed Model ◽  
Condenser Temperature ◽  
Vapor Compression System ◽  
Vapor Compression Cooling

This paper presents the analysis of a modified vapor compression cooling system which uses an ejector as an expansion device. Expanding refrigerant in an ejector enhances the refrigeration effect and reduces compressor work. Therefore, it yields a better coefficient of performance. Thermodynamic analysis of a constant area ejector model has been done to obtain primary dimensions of the ejector for given condenser and evaporator temperature and cooling capacity. The proposed model has been used to design the ejector for three refrigerants; R134a, R152a and R1234yf. The refrigerant flow rate and the diameters at various sections of the ejector have been obtained by doing numerical modeling in Engineering Equation Solver (EES). Refrigerant R1234yf demanded the highest diameter requirements at a fixed 5∘C evaporator temperature and 40∘C condenser temperature for a given range of cooling load. Both primary and secondary refrigerants flow rates are higher for R1234yf followed by R134a and then R152a.

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