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Abstract

Opened air cycle is a promising sewage concentration technology using heated air as the medium to absorb water from the sewage. Unlike closed cycles, the air flow is directly ejected out of the system after humidification in opened cycles. Operating conditions and the circle's efficiency are highly affected by the weather, such as the time-varying ambient temperature and relative humidity. Since the evaporating temperature relies on the ambient temperature, to restrain its dependence, the evaporator was proposed combined with the ejected air flow in this paper. Such a design could improve the efficiency of the heat pump by increasing its evaporating temperature. Simulation of the newly proposed open sewage concentration cycle was performed to investigate its thermal process and economic efficiency under actual weather conditions. Thermodynamic models of the compressor, heat exchangers and the sewage concentration chamber were established. Climatic conditions at Xi'an, China were referenced as actual weather conditions. Optimisation of the working parameters was performed to achieve higher economic index. The results demonstrated that the average monthly power consumption of the optimized cycle was 0.3508 kWh/kg. Compared with the published data of the closed cycle, the total cost of new opened cycle was nearly one-third lower.

Item Type:	Conference Publication
Authors/Creators:	Zhang, Y and Guo, TS and Wu, WF and Li, CY and Wang, XL
Keywords:	heat pump, sewage concentration, open cycle
Journal or Publication Title:	IOP Conference Series: Materials Science and Engineering
Publisher:	Institute of Physics Publishing Ltd.
ISSN:	1757-8981
DOI / ID Number:	10.1088/1757-899X/1180/1/012060
Copyright Information:	Content from this work may be used under the terms of theCreative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd
Related URLs:	Google Scholar: Wang, XL UTAS Profile: Wang, XL
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