scholarly journals Experimental study on solar-powered adsorption refrigeration cycle with activated alumina and activated carbon as adsorbent

2016 ◽  
Vol 7 ◽  
pp. 36-46 ◽  
Author(s):  
Himsar Ambarita ◽  
Hideki Kawai
Keyword(s):  
Experimental Study ◽  
Activated Carbon ◽  
Refrigeration Cycle ◽  
Activated Alumina ◽  
Adsorption Refrigeration ◽  
Solar Powered

SOLAR-POWERED ADSORPTION REFRIGERATION CYCLE OPTIMIZATION

2016 ◽  
Vol 78 (5-8) ◽  
Author(s):  
Norhafizah Ahmad Junaidi ◽  
Tohru Suwa
Keyword(s):  
Activated Carbon ◽  
Temperature Distribution ◽  
Solar Radiation ◽  
Air Conditioning ◽  
Thermal Storage ◽  
Hot Water ◽  
Refrigeration Cycle ◽  
Uniform Temperature ◽  
Adsorption Refrigeration ◽  
Solar Powered

Solar energy is an attractive energy source among various renewable energy resources in Malaysia as relatively high solar radiation is available throughout the year. This solar energy can be utilized for air-conditioning by using solar-powered adsorption refrigeration cycle. Intermittent nature of the solar radiation leads to a challenge for continuous air-conditioning operation. In the present study, a combination of solar-powered adsorption refrigeration system and thermal storage is studied. Activated carbon-ammonia and activated carbon-methanol are the working pairs of the adsorption reaction. Analytical calculation results show that activated carbon-methanol pair indicates higher coefficient of performance (COP) than activated carbon-ammonia pair, while adsorption chiller system with hot water thermal storage has higher COP than the system with ice thermal storage. For the activated carbon-methanol case with hot water thermal storage, the COP is 0.79. Since this COP analysis is based on the ideal case with uniform temperature distribution within the reactor beds, which achieves equilibrium states at the end of the reactions. In more realistic situation, the reaction process will be terminated before reaching to the equilibrium states because of the non-uniform temperature distribution and the time required for the reaction. Transient simulation in which heat transfer and reaction equation are combined will be performed to model actual reactors.

Study of the Effects of Mass and Heat Recovery on the Performances of Activated Carbon/Ammonia Adsorption Refrigeration Cycles

2002 ◽  
Vol 124 (3) ◽  
pp. 283-290 ◽  
Author(s):  
T. F. Qu ◽  
W. Wang ◽  
R. Z. Wang
Keyword(s):  
Activated Carbon ◽  
Working Conditions ◽  
Heat Recovery ◽  
Recovery Process ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Refrigeration Cycle ◽  
Adsorption Refrigeration ◽  
Ammonia Adsorption ◽  
Mass Recovery

Mass recovery can play an important role to better the performance of adsorption refrigeration cycles. Cooling capacity can be significantly increased with mass recovery process. The coefficient of performance (COP) of the activated carbon/ammonia adsorption refrigeration cycle might be increased or decreased with mass recovery process due to different working conditions. The advantage is that its COP is not sensitive to the variation of heat capacity of adsorber metal and condensing and evaporating temperature. The cycle with mass and heat recovery has a relatively high COP.

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