以TFE/E181为工质的二级吸收式换热器(AHT)循环分析

吸收式换热器的应用目的是将部分低温余热升温到可以重新利用的程度，并且回收的热量应尽可能多，但运用传统的循环和工质很难同时达到这一目的。作者介绍了一种二级吸收式换热器的流程及其热力学计算模型，并以新型工质TFE／TEGDME（三氟乙醇／二甲醚四甘醇）对其进行了热力计算。结果显示：该循环能同时达到较高的性能系数（COP，0．32）和温升（70℃），适合用于工业中回收低温余热，且具有较好的经济价值。

Cycle Analysis of Two-Staged Aspirating Heat Exchanger(AHT) Based on TFE/E181

The heat transformer is proposed to upgrade low temperature level energy to a higher level and to recover more energy in low temperature level waste heat. It is difficult to achieve both purposes at the same time using conventional cycle and classical working pairs. The nwe organic working pairs of TFE/E181 has some advantages compared with the conventional. In this paper, the two staged AHT cycle and its flow diagram are shown and the computing models of the cycle are presented. Thermal calculation of the cycle was worked out. From the results, it can be found that there is a large temperature drop when waste hot water flows through the generator and evaporator in the cycle but the beating temperature can be kept the same. This means more energy in the waste heat source can be recovered by the cycle. Figs6 and refs6.