Open air-vapor compression refrigeration system for air conditioning and hot water cooled by cool water

Shaobo Hou, Huacong Li, Hefei Zhang

科研成果: 期刊稿件文章同行评审

23 引用 (Scopus)

摘要

This paper presents an open air-vapor compression refrigeration system for air conditioning and hot water cooled by cool water and proves its feasibility through performance simulation. Pinch technology is used in analysis of heat exchange in the surface heat exchanger, and the temperature difference at the pinch point is selected as 6 °C. Its refrigeration depends mainly on both air and vapor, more efficient than a conventional air cycle, and the use of turbo-machinery makes this possible. This system could use the cool in the cool water, which could not be used to cool air directly. Also, the heat rejected from this system could be used to heat cool water to 33-40 °C. The sensitivity analysis of COP to ηc and ηt and the simulated results T4, T7, T8, q1, q2 and Wm of the cycle are given. The simulations show that the COP of this system depends mainly on T7, ηc and ηt and varies with T3 or Twet and that this cycle is feasible in some regions, although the COP is sensitive to the efficiencies of the axial compressor and turbine. The optimum pressure ratio in this system could be lower, and this results in a fewer number of stages of the axial compressor. Adjusting the rotation speed of the axial compressor can easily control the pressure ratio, mass flow rate and the refrigerating capacity. The adoption of this cycle will make the air conditioned room more comfortable and reduce the initial investment cost because of the obtained very low temperature air. Humid air is a perfect working fluid for central air conditioning and no cost to the user. The system is more efficient because of using cool water to cool the air before the turbine. In addition, pinch technology is a good method to analyze the wet air heat exchange with water.

源语言英语
页(从-至)2255-2260
页数6
期刊Energy Conversion and Management
48
8
DOI
出版状态已出版 - 8月 2007

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