Complexible Heat Transfer Characteristics for Absorption and Condensation of Mutual Insoluble Mixed Refrigerant using Water as Main Refrigerant

目前，从有效利用能源、节约成本和小型化的角度出发，有必要开发一种先进的单效吸收循环，既能达到双效效率，又能保持单效循环的优点。为了提高效率和充分利用低温热源，研究了采用辅助制冷剂在吸收器和蒸发器之间循环的高级吸收循环。作为第一步，提出了高效吸收循环的工作原理和辅助制冷剂的技术选择，这对该循环的效率起着重要的作用。本研究主要通过循环仿真来验证其工作原理和性能特点。在循环模拟中，各组分均采用以水/溴化锂为主制冷剂和吸收剂组合的逆流式换热器。由于辅冷剂不能与主液对混溶，故选用庚醇作为辅冷剂。基于这些流体组合进行了计算机仿真，得到了循环性能。并对该循环与常规循环的COP进行了比较。本研究的目的之一是验证这种吸收循环的原理。为此，笔者制作了一套实验装置，对该实验系统在实际条件下的性能进行了测试。这些实验的结果是为了清除冷冻水和辅助制冷剂对这个吸收循环的影响。阐述了该循环的原理，验证了该循环的实用性和实用性。

Now a days, it is necessary to develop an advanced single effect absorption cycle which could reach the double effect efficiency, and keep the advantages of a single effect cycle for the viewpoint of effective utilization of energy, cost and miniaturization. In this study, the advanced absorption cycle with the circulation of the auxiliary refrigerant between the absorber and the evaporator has been studied to improve the efficiency and to utilize the low temperature heat sources.As an initial step, it is propose that the operating principles of a high performance absorption cycle the technical choice of auxiliary refrigerant which lays an important role on the efficiency of this cycle.This study focuses on the cycle simulation to verify the operating principles and the performance characteristics. In the cycle simulation the counterflow type heat exchanger was assumed for each component with the Water/LiBr as the main refrigerant and absorbent combination. Since the auxiliary refrigerant should be immiscible with the main fluid pair, Heptanol was selected as the auxiliary refrigerant. Computer simulation was carried out based on these fluids combinations, cycle performance was obtained. Comparison of COP between this cycle and conventional ones was made.One purpose of this study is to verify the principle of this absorption cycle. So author made an experimental apparatus in order to clarify the performances of a real type experimental system in actual conditions, and tested the performances of this system. The results of these experiments was to clear the effect of chilled water and auxiliary refrigerant for this absorption cycle. Also the principle of this cycle was shown and author verified the practicability and usefulness of this absorption cycle.