Optimization of a heat assisted air-conditioning system comprising membrane and desiccant technologies for applications in tropical climates

被引:12
作者
Safizadeh, M. Reza [1 ,2 ,3 ]
Morgenstern, Alexander [2 ]
Bongs, Constanze [2 ]
Henning, Hans-Martin [2 ]
Luther, Joachim [2 ]
机构
[1] NUS Grad Sch Integrat Sci & Engn, 28 Med Dr, Singapore 117456, Singapore
[2] Fraunhofer Inst Solar Energy Syst, Heidenhofstr 2, D-79110 Freiburg, Germany
[3] Natl Univ Singapore, Solar Energy Res Inst Singapore, 7 Engn Dr 1, Singapore 117574, Singapore
基金
新加坡国家研究基金会;
关键词
Air-conditioning systems; Tropical climates; Membrane dehumidification; Solid desiccant dehumidification; System optimization; DEHUMIDIFICATION SYSTEM; WASTE HEAT; PERFORMANCE; ADSORPTION; ENERGY; REFRIGERATION; EFFICIENT; RECOVERY; CYCLE; BEDS;
D O I
10.1016/j.energy.2016.02.007
中图分类号
O414.1 [热力学];
学科分类号
摘要
Separating dehumidification and cooling loads in air-conditioning systems has been proven to be a potential strategy to reduce electricity consumption if the dehumidification of air is mostly performed by heat-powered system components. Referring to experimental experiences in Singapore, this paper presents a novel electricity-efficient air-conditioning system consisting of a membrane unit, an evaporatively cooled sorptive dehumidification system (called ECOS system) and a high-efficient conventional cooling unit. The dehumidification of air is performed by a combination of the membrane unit and the ECOS system, and the sensible cooling of air is accommodated by a high-efficiency conventional chiller and in part by the membrane device. In order to find an optimized balance of the three air-conditioning components, an optimization-based simulation approach using a genetic algorithm is developed. The optimization is based on a simple objective function that comprises operating and investment costs. The optimization results reveal that an integration of a relatively large membrane unit, a small ECOS unit and a chiller operating at an elevated evaporation temperature is the most cost effective combination meeting comfort criteria. The resulting optimized combination has potential to save more than 50% of the system's lifetime operating cost compared to conventional systems supplying 100% fresh air. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:52 / 64
页数:13
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