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Study of a rotary vane expander for the transcritical [CO.sub.2] cycle--part II: theoretical modeling.(Report): An article from: HVAC & R Research
Book Details
ISBN / ASINB003S0WYFI
ISBN-13978B003S0WYF9
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Sales Rank10,261,297
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Description
This digital document is an article from HVAC & R Research, published by American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. on July 1, 2009. The length of the article is 7143 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available immediately after purchase. You can view it with any web browser.
From the author: A mathematic model focusing on expander thermodynamics and vane dynamics was developed to investigate the major factors influencing the efficiencies of the rotary vane expander. Several factors were taken into account, including the leakage through various leakage paths, friction associated with the vanes, and flow through the inlet/outlet ports. The model was validated by comparing the calculated thermodynamic processes and vane movement with the experimental data, which showed the deviation was less than 10%. The predicted results from the model indicated that the expander would have an optimum pressure ratio of about 2.2. Although the volumetric efficiency increased with the rotational speed, the optimal rotational speed of 2300 rpm was obtained at inlet and outlet pressures 8 MPa (1160 psi) and 4 MPa (580 psi) and an inlet temperature of 40[degrees]C. The leakage through both the end gaps and the sealing arc had a significant influence on the expander efficiency, accounting for 35% and 28%, respectively, of the losses in the volumetric efficiency. Among the major geometric parameters of the expander, larger eccentricity and vane incline angle had a positive effect on the expander efficiencies, and the increase in the vane width had a negative effect, while the effect of the ratio of length to radius seemed to be insignificant.
Citation Details
Title: Study of a rotary vane expander for the transcritical [CO.sub.2] cycle--part II: theoretical modeling.(Report)
Author: Xiaohan Jia
Publication:HVAC & R Research (Magazine/Journal)
Date: July 1, 2009
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 15 Issue: 4 Page: 689(21)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
From the author: A mathematic model focusing on expander thermodynamics and vane dynamics was developed to investigate the major factors influencing the efficiencies of the rotary vane expander. Several factors were taken into account, including the leakage through various leakage paths, friction associated with the vanes, and flow through the inlet/outlet ports. The model was validated by comparing the calculated thermodynamic processes and vane movement with the experimental data, which showed the deviation was less than 10%. The predicted results from the model indicated that the expander would have an optimum pressure ratio of about 2.2. Although the volumetric efficiency increased with the rotational speed, the optimal rotational speed of 2300 rpm was obtained at inlet and outlet pressures 8 MPa (1160 psi) and 4 MPa (580 psi) and an inlet temperature of 40[degrees]C. The leakage through both the end gaps and the sealing arc had a significant influence on the expander efficiency, accounting for 35% and 28%, respectively, of the losses in the volumetric efficiency. Among the major geometric parameters of the expander, larger eccentricity and vane incline angle had a positive effect on the expander efficiencies, and the increase in the vane width had a negative effect, while the effect of the ratio of length to radius seemed to be insignificant.
Citation Details
Title: Study of a rotary vane expander for the transcritical [CO.sub.2] cycle--part II: theoretical modeling.(Report)
Author: Xiaohan Jia
Publication:HVAC & R Research (Magazine/Journal)
Date: July 1, 2009
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 15 Issue: 4 Page: 689(21)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
