TFE/NMP系吸収冷凍サイクルにおける排ガス駆動発生器の熱伝達特性

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One of the most effective methods to use waste heat to energy in the field of air conditioning and refrigeration is the use of absorption refrigeration cycle. Absorption refrigerator or heat pump works mainly by heat driven, which provides lower electric power consumption. In this study the heat transfer characteristics of the generator in the absorption refrigeration cycle driven by engine exhaust were investigated. The experimental equipment consists of the generator, absorber, reservoir and solution pump. The generator is plate-type heat exchanger in order to minimize the effective heat transfer length and to enhance the heat transfer. The absorption working fluid(solution)is transferred from the reservoir to the generator by the solution pump. And the solution is heated by exhaust in the generator and generates the refrigerant. Then the solution is cooled in the absorber by cooling water and absorbs the refrigerant vapor, and flows back to the reservoir. The working fluid pair of TFE/NMP was introduced in order to adapt wide range in temperature of waste heat. In the experiments exhaust temperature was changed as a parameter. In result the maximum heat recovery rate was 259.2W at exhaust temperature of 71.4[℃]and the over-all heat transfer coefficient of the generator tested in this study was 79.7[W/m2K]～88.2[W/m2K]. Further more it is found that the temperature difference for initiating the boiling heat transfer is more than 14[K].
関東学院大学工学総合研究所の論文

TFE/NMP系吸収冷凍サイクルにおける排ガス駆動発生器の熱伝達特性

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