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Modélisation idéale du processus de pompes à chaleur à absorption fonctionnant avec une solution réelle.

[In Chinese. / En chinois.]

Auteurs : XIE X., JIANG Y.

Type d'article : Article

Résumé

An ideal process model based on real solution for absorption heat pump is obtained in this paper. First, temperature lift factor is derived for real solution with infinite solution flow rate, and a correction factor kr is used to consider the difference with ideal solution, which is mainly dependent on the activity coefficient of solution in the generator and the absorber. For absorption heat pump, kr is higher than 1 and the COP is lower than that with ideal solution; for absorption heat transformer, kr is lower than 1 and the COP is higher than that with ideal solution. Then for real solution with finite flow rate, temperature lifting factor is defined and compared with solution of infinite flow rate. The correction factor kr is lower for real solution with finite flow rate and influenced by the concentration difference of solution, and the higher the concentration difference, the lower the kr. The COP for solution with finite solution flow rate is lower than the COP with infinite solution flow rate. Whatever the flow rate of real solution is infinite or finite,it always meets that fCOP1< TaTe/TgTc (for absorption heat pump),fCOP2 <0. 5TaTe/TgTc (for absorption heat transformer). Finally, two cases are studied, which indicates that the external performance of absorption heat pump can be obtained only by the theoretical model proposed in this paper and without complex calculation of inside solution cycles. Using the theoretical model of this paper, a clear knowledge of heat conversion process can be gained for absorption heat pumps from a new point of view.

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Pages : 13-23

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