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Experimental and Theoretical Study on Chemisorption Refrigeration

Author: ChenZuo
Tutor: TanYingKe
School: South China University of Technology
Course: Chemical Engineering
Keywords: Chemisorption Refrigeration Working pair Coefficient of performance Heat and mass transfer enhancement
CLC: TB66
Type: PhD thesis
Year: 1999
Downloads: 280
Quote: 2
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Abstract


Adsorption refrigeration is a kind of environmentally friendly green refrigeration technology. Its major superiority is the capability of using low-grade thermal energy and environmental protection, so it has been generally regarded as one of the primary technologies for alternation to CFCs conventional compression refrigeration systems in the 21st century. Selection of adsorbent-adsorbate working pairs for adsorption systems is an important aspect. The chemisorption pairs using inorganic salts as adsorbent and ammonia as adsorbate have a series of advantages, such as the large refrigeration capacity per unit weight of adsorbent and the appropriate operation condition, etc., and give vastly developing prospects.Detailed theoretical and experimental studies on the performances of four alkaline-earth metal chlorides, MgCl2, CaCl2, SrCl2 and BaCl2, adsorbing to ammonia have been carried out in the thesis. The results show that all of above compounds can absorb ammonia, but only the CaCl2-NH3 and SrCl2-NH3 pairs have commercially developing value. The adsorption isotherm equations of these two pairs are fit by computer. In the experimental range, the maximum ammonia adsorption amounts, 6.4 mol / mol for CaCl2 and 8.1 mol / mol for SrCl2, are obtained. The refrigeration performances and the engineering characteristics of the CaCl2-NH3 and SrCl2-NH3 pairs are also good. A novel ideal that introduce the theory of adsorption potential energy to explain the "adsorption platform" appeared in the adsorption isotherms is presented in this thesis. From the energy point of view, the effect of temperature and pressure on the movement of gas and solid molecules, elastic collisions, inelastic collisions and trapping and physisorption, chemisorption and desorption is analyzed. The result is that temperature is the process control factor. The theoretical analysis and experimental results give a well agreement.The basic performances of the CaCl2-NH3 and SrCl2-NH3 pairs chemisorption refrigeration and the influenced factors have been investigated experimentally and theoretically. In the same operation conditions, the refrigeration capacity per unit weight of adsorbent of CaCl2-NH3 and SrCl2-NH3 pairs is far higher than that of activated carbon-methanol pair. For example, in the condition of 100℃heat source

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CLC: > Industrial Technology > General industrial technology > Refrigeration Engineering > Refrigeration technology
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