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Heat Transfer Research
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2014007288
pages 109-122

SIMULATION OF HEAT AND MASS TRANSFER PERFORMANCE WITH CONSOLIDATED COMPOSITE ACTIVATED CARBON

Yanjie Zhao
Institute of Refrigeration and Cryogenics, Key Laboratory for Power Machinery and Engineering of M.O.E., Shanghai Jiao Tong University, Shanghai, 200240, China
Liwei Wang
Institute of Refrigeration and Cryogenic, Key Laboratory of Power Machinery and Engineering of MOE, Shanghai Jiao Tong University, Shanghai 200240, China
R Z Wang
Shanghai Jiao Tong University
Z. Q. Jin
Institute of Refrigeration and Cryogenics, Key Laboratory for Power Machinery and Engineering of M.O.E., Shanghai Jiao Tong University, Shanghai, 200240, China
L. Jiang
Institute of Refrigeration and Cryogenics, Key Laboratory for Power Machinery and Engineering of M.O.E., Shanghai Jiao Tong University, Shanghai, 200240, China
Morgane Fleurance
Institute of Refrigeration and Cryogenics, Key Laboratory for Power Machinery and Engineering of M.O.E., Shanghai Jiao Tong University, Shanghai, 200240, China

ABSTRACT

The heat and mass transfer properties of a new type of a consolidated composite activated carbon adsorbent based on the host matrix of expanded natural graphite treated with sulfuric acid were simulated, and the simulation results of 20 samples (19 composite activated carbon samples with different densities and different proportions of activated carbon and 1 granular activated carbon sample) were analyzed to choose an optimal adsorbent in the adsorption air-conditioning and freezing cycles. The relationships between the adsorber temperature, pressure in the adsorber, and the running time were discussed. The cycle time, coefficient of performance, specific cooling power, and the volume cooling power of each sample were also calculated and compared. The influence of the adsorbent layer thickness was analyzed for the optimal composite activated carbon. The results show that the heat transfer resistance is significantly reduced for the consolidated composite activated carbon. The mass transfer resistance is negligible except for the AC sample with an AC ratio of 33%. The optimal composite activated carbon is used in both air-conditioning and freezing cycles. The highest volume cooling power of composite activated carbon is 76.9 kW·m−3 , while the volume cooling power of granular activated carbon is about 10.6 kW·m−3 in the air-conditioning cycle. After the reduction of the adsorbent thickness, the heat and mass transfer performance is improved, while the coefficient of performance decreases slightly.


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