scholarly journals Effects of sub-cooler on cooling performance of air conditioning system with natural refrigerant R290

2020 ◽  
Author(s):  
Gavin Cakraditya ◽  
Fathurrahman Yudhi ◽  
Ardiyansyah Yatim
Keyword(s):  
Air Conditioning ◽  
Air Conditioning System ◽  
Cooling Performance ◽  
Natural Refrigerant

scholarly journals Experimental and Theoretical Study on the Cooling Performance of a CO2 Mobile Air Conditioning System

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1927 ◽  
Author(s):  
Dandong Wang ◽  
Binbin Yu ◽  
Junye Shi ◽  
Jiangping Chen
Keyword(s):  
Air Conditioning ◽  
Theoretical Study ◽  
Cooling Capacity ◽  
Air Conditioning System ◽  
Cooling Performance ◽  
System A ◽  
Hfc 134A ◽  
Expansion Valve ◽  
The Impact ◽  
Compressor Efficiency

CO2 (GWP = 1) is considered as a promising natural alternative refrigerant to HFC-134a in mobile air conditioning (MAC) applications. The objective of this study is to investigate the cooling performance characteristics of a CO2 MAC system. A prototype CO2 MAC system, consisting of a CO2 electrical compressor, CO2 parallel flow microchannel heat exchangers, and an electrical expansion valve, was developed and tested. Factor analysis experiments were conducted to reveal the effect of outdoor temperature on the cooling performance of this CO2 MAC system. Compared with a conventional R134a MAC system, the prototype CO2 MAC system achieved comparable cooling capacity, but had COP reductions of 26% and 10% at 27 °C and 45 °C outdoor conditions, respectively. In addition, based on refrigerant properties, theoretical cycle analysis was done to reveal the impact of evaporator, gas cooler and compressor, on the system cooling performance. It is concluded that the increase of overall compressor efficiency or the decrease of gas cooler approaching temperature could greatly improve the COP of this CO2 MAC system.

scholarly journals Cooling performance of Ceiling Radiant Textile Air Conditioning System with Ceiling Cassette Unit of Packaged Air Conditioner

2019 ◽  
Vol 111 ◽  
pp. 01082
Author(s):  
Toshio Yamanaka ◽  
Mari Kuranaga ◽  
Tatsunori Maeda ◽  
Haruto Kitakaze
Keyword(s):  
Air Conditioning ◽  
Scale Model ◽  
Airflow Rate ◽  
Air Conditioner ◽  
Tracer Gas ◽  
Vertical Temperature ◽  
Air Conditioning System ◽  
Cooling Performance ◽  
The Third ◽  
Vertical Temperature Distribution

The authors developed a new radiant air conditioning system named ceiling radiant textile air conditioning system with ceiling cassette unit of packaged air conditioner (PAC). The nonflammable textile is stretched under the ceiling with ceiling cassette units of PAC with a distance of around 30 cm. The aim of this study is to investigate the cooling performance of this new radiant system, so the experiments with full scale model were conducted for three system. The first system is “textile only”, the second system is “textile with guide for air return grille” and the third system is “textile with guide and opening for air return grille”. Airflow rate through textile is measured by tracer gas method. In all cases, the vertical temperature distribution is almost uniform, and the cooling effect of “textile with guide and opening for air return grille” is the largest. As for the radiant effect, two systems of “only textile” and “textile with guide for air return grille” are superior to “textile with guide and opening for air return grille”. The airflow rate trough textile is doubled when using guide, and increased by five times if the opening was provided under the guide.

Effects of sub-cooler on cooling performance of variable refrigerant flow air conditioning system

2017 ◽  
Vol 127 ◽  
pp. 1152-1163 ◽  
Author(s):  
Qiu Tu ◽  
Lina Zhang ◽  
Wei Cai ◽  
Xiujuan Guo ◽  
Chenmian Deng ◽  
...  
Keyword(s):  
Air Conditioning ◽  
Air Conditioning System ◽  
Cooling Performance
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