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doi: 10.3850/978-981-08-7614-2_IMPRES011
Performance Studies of Combined Adsorption Refrigeration Cycles
Khairul Habib1, Bidyut B. Saha2, Anutosh Chakraborty3 and Shigeru Koyama4
1Solar Energy Research Institute of Singapore, National University of Singapore, 7 Engineering Drive 1, Blk E3A, #06-01 Singapore 117574
2Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka-shi, Fukuoka 819-0395, Japan.
saha@mech.kyushu-u.ac.jp
3School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
4Interdisciplinary Graduate School of Engineering Science, Kyushu University, Kasuga-koen 6-1, Kasuga-shi, Fukuoka 816-8580, Japan
ABSTRACT
This article presents the transient analysis of a combined adsorption refrigeration cycle. A computer simulation program is developed to investigate the performance of this novel combined cycle which amalgamates two adsorption cycles, where an activated carbon (AC)-R507A cycle is topped by an activated carbon-R134a cycle and generates a refrigeration load as low as -10°C at the bottoming cycle. This innovative cycle is powered by solar energy or waste heat sources which can help to reduce greenhouse gases and provide increased energy efficiency. The simulation is based on the experimentally confirmed adsorption isotherms, kinetics and isosteric heat of the adsorption data of R134a and R507A on pitch based activated carbon of type Maxsorb III. Pertaining to a thermodynamically equilibrium model, the performance of the combined adsorption cycle has been studied. The optimum cooling capacity, coefficient of performance (COP) and chiller efficiency are calculated in terms of adsorption-desorption cycle time, switching time, regeneration temperature, brine inlet temperature and cooling water inlet temperature. Results show that the combined adsorption cycles are feasible even when low grade heat is available.
Keywords: Activated carbon, Adsorption, Refrigeration, R134a, R507A.
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