Renewable energy for liquid desiccants air conditioning system: A review

A rechargeable personal air-conditioning (RPAC) device was developed to provide an improved thermal comfort level for individuals in inadequately cooled environments. This device is a battery powered air-conditioning system with the phase change material (PCM) for heat storage. The condenser heat is stored in the PCM during the cooling operation and is discharged while the battery is charged by using the vapor compression cycle as a thermosiphon loop. The conditioned air is discharged towards a single person through adjustable nozzle. The main focus of the current research was on the development of the cooling system. A 100 W cooling capacity prototype was designed, built, and tested. The cooling capacity of the vapor compression cycle measured was 165.6 W. The PCM was recharged in nearly 8 hours under thermosiphon mode. When this device is used in the controlled built environment, the thermostat setting can be increased so that building air conditioning energy can be saved by about 5–10%.

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

Energies ◽

10.3390/en11081927 ◽

2018 ◽

Vol 11 (8) ◽

pp. 1927 ◽

Cited By ~ 4

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.

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R1234yf vs R134a in automotive air conditioning system: A comparison of the performance

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/863/1/012049 ◽

2020 ◽

Vol 863 ◽

pp. 012049

Author(s):

M Z Sharif ◽

W H Azmi ◽

N N M Zawawi ◽

R Mamat ◽

A H Hamisa

Keyword(s):

Air Conditioning ◽

Air Conditioning System ◽

System A ◽

Automotive Air Conditioning ◽

Automotive Air Conditioning System

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React: self-sufficient renewable energy air-conditioning system for Mediterranean countries

Desalination ◽

10.1016/j.desal.2007.04.061 ◽

2008 ◽

Vol 220 (1-3) ◽

pp. 600-611 ◽

Cited By ~ 7

Author(s):

Toufic El Asmar

Keyword(s):

Renewable Energy ◽

Air Conditioning ◽

Air Conditioning System ◽

Mediterranean Countries

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Performance Value Index of the Solar Air-Conditioning System-PVI

ASME 2008 2nd International Conference on Energy Sustainability, Volume 2 ◽

10.1115/es2008-54141 ◽

2008 ◽

Author(s):

Yuefen Gao ◽

Xutao Zhang ◽

Guohua Shi

Keyword(s):

Renewable Energy ◽

Air Conditioning ◽

Air Conditioner ◽

Performance Indices ◽

Air Conditioning System ◽

New Energy ◽

Energy Application ◽

Solar Application

Presently, the performance of the air-conditioner or the air-conditioning system is usually valued based on some performance indices. However, it is deficient to evaluate the performance of the air-conditioning system which uses the new energy or renewable energy only based on the indices mentioned above. According to the defects and based on the works of the solar application, a new index defined PVI is put forward to evaluate the performance of the solar air-conditioning system rationally, which is significant to the new energy or renewable energy application.

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