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Design and Performance Evaluation of a Twin Screw Water Vapor Compressor

By Zhilong He, Jiubing Shen, Wenqing Chen and Ziwen Xing

Abstract

The heat pump system of mechanical vapor compression/recompression (MVC/MVR) combined with evaporation is a high efficiency, energy-saving solution for energy intensive processes. However, a suitable compressor with high pressure ratio and low discharge temperature is not available in engineering practice. In this paper a water-injected twin screw compressor recognized as a promising type for water vapor compression is presented by detailed descriptions of the rotor profile development and structure design. Then the calculation of water quantity and its influence on the steam flow rate are presented. Moreover, the effects of injected water on the working process and performance of the compressor are discussed. Finally, it is found that the volume flow rate increases a lot because of the water evaporation during the compressing process which is originally aims to guarantee saturate discharge temperature. And the temperature difference of the MVC system is a main parameter that affects the performance of the compressor

Topics: mechanical vapor recompression, mulit-effect evaporation, twin screw water vapor compressor, water injection, mathematical model
Publisher: Purdue University
Year: 2012
OAI identifier: oai:docs.lib.purdue.edu:icec-3083
Provided by: Purdue E-Pubs

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Citations

  1. An investigation of high operating temperatures in mechanical vaporcompression desalination. Desalination, 227(2008):217-232 Narmine H Aly, Adel K El-Fiqi. Mechanical compression desalination systems—a case study.
  2. (1997). Thore Berntsson. Critical COP for economically feasible industrial heat-pump application. Applied Thermal Engineering,
  3. (1986). Use of a twin screw compressor for steam compression.

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