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Performance analysis of an adsorption heat pump: SWS-1L composite adsorbent/water as the working pair
|關鍵字:||adsorption heat pump|
specific cooling capacity
second law of thermodynamics
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Two work deals with the computer analysis of the COP and specific cooling capacity (QE) of a muti-bed adsorption heat pump, which was a composite adsorbent in adsorbing water. A second-law analysis was also conducted to analyze the exergy loss in the heat pump. The computer analysis adopted a solid-side mass-diffusion resistance model. A composite adsorbent (KSK silica gel impregnated with CaCl2) and water were selected as the adsorption pair. The temperature of cooling/heating fluid is a function of location and time and the adsorption heat is a function of adsorbent temperature (Tb), and refrigerant content (W). In the analysis, the effect of cycle time (4τ) and regeneration temperature (TG) on the COP and QE were investigated. The result reveals that, at the maximum QE, using the composite adsorbent can effectively upgrade the COP up to 51% and the QE up to 38.4%. The moving heating source is expressed as exergy input to the adsorber. At the TG of 100℃ and τ of 360 seconds, the result shows that the second-law efficiency of the heat pump is 20.4%. The exergy loss is mainly induced in the preheating process and precooling process. The former results in a 28.96% of the total loss and the latter is 41.55%.
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