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

以水为主工质的互不溶混合工质吸收冷凝复合传热特性

基本信息

批准号：
63550157
负责人：
KASHIWAGI Takao
金额：
$ 1.41万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

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.

目前，从能源的有效利用、成本和小型化的角度来看，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。本研究以吸收器与蒸发器间辅助冷媒循环之先进吸收式循环为研究对象，以提高效率及利用低温热源。提出了高性能吸收式循环的工作原理，指出了辅助制冷剂的技术选择对循环效率的重要性，对循环进行仿真，验证其工作原理和性能特点。在循环模拟中，逆流型换热器被假定为每个组件与水/溴化锂作为主要制冷剂和吸收剂组合。由于辅助制冷剂应与主流体对不混溶，因此选择庚醇作为辅助制冷剂。对这些流体组合进行了计算机模拟，得到了循环性能。本文的目的之一是验证这种吸收式循环的原理。为此，为了阐明真实的型实验系统在实际条件下的性能，作者制作了一套实验装置，并对该系统的性能进行了测试。这些实验的结果是为了明确冷冻水和辅助制冷剂对这种吸收循环的影响。同时，对该循环的原理进行了说明，验证了该吸收循环的实用性和有效性。