Dynamic simulation of CaO/Ca(OH)2 chemical heat pump systems

Exergy, An International Journal Pub Date : 2002-01-01 DOI:10.1016/S1164-0235(01)00035-8

S. Fujimoto , E. Bilgen , H. Ogura

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引用次数: 27

Abstract

Using energy and exergy analyses, a dynamic simulation is carried out with a CaO/Ca(OH)₂ chemical heat pump system for heating and cooling applications. The system consists of hydration/dehydration reactor connected to condenser/evaporator with a control valve in between. During the dehydration process, heat is supplied at 700 K for dehydration of Ca(OH)₂ and steam is condensed at 293 K. During evaporation/hydration process, heat is supplied at 290 K for evaporation of water at 273 K and heat of hydration is supplied to a load at 353 K. Duration of one cycle takes about 12 hours. Two subsystems are used to provide for heating/cooling demands in a continuous manner. Using synthetic demands of a residential dwelling, various performance parameters have been calculated for a 24 hour period. The results showed that CaO/Ca(OH)₂ chemical heat pump system could satisfy heating and cooling demands of a typical dwelling. Its energy and exergy efficiencies were 58.7% and 61.6% for heating and 12.7% and 4.5% for cooling respectively.

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CaO/Ca(OH)2化学热泵系统的动态模拟

利用能量和火用分析，对CaO/Ca(OH)2化学热泵系统进行了动态模拟。该系统由水合/脱水反应器连接到冷凝器/蒸发器，中间有一个控制阀。在脱水过程中，在700k的温度下提供热量用于Ca(OH)2的脱水，在293 K的温度下冷凝蒸汽。在蒸发/水化过程中，水在273 K蒸发时在290 K处提供热量，水化热在353 K处提供给负载。一个周期的持续时间约为12小时。两个子系统用于以连续的方式提供加热/冷却需求。根据住宅的综合需求，计算了24小时内的各种性能参数。结果表明，CaO/Ca(OH)2化学热泵系统可以满足典型住宅的供暖和制冷需求。供暖和制冷的能源效率分别为58.7%和61.6%，12.7%和4.5%。

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Exergy, An International Journal

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