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Research Papers

An Experimental Investigation of Steam Ejector Refrigeration Systems

[+] Author and Article Information
Jingming Dong

Institute of Marine Engineering and Thermal Science,  Marine Engineering College, Dalian Maritime University, Dalian 116026, China;Department of Mechanical & Aerospace Engineering,  University of Missouri, Columbia, MO 65211

D. A. Pounds

Department of Mechanical & Aerospace Engineering,  University of Missouri, Columbia, MO 65211

P. Cheng

ThermAvant Technologies, LLC, Columbia, MO 65211

H. B. Ma1

LaPierre ProfessorFellow ASMEDepartment of Mechanical & Aerospace Engineering,  University of Missouri, Columbia, MO 65211mah@missouri.edu

1

Corresponding author.

J. Thermal Sci. Eng. Appl 4(3), 031004 (Jul 16, 2012) (7 pages) doi:10.1115/1.4006714 History: Received May 27, 2011; Revised March 30, 2012; Published July 16, 2012; Online July 16, 2012

A steam ejector refrigeration system with a movable primary nozzle was developed in order to determine the nozzle exit position (NXP) effect on the coefficient of performance (COP). Experimental results show that there exists an optimum NXP for the ejector system investigated herein. The effects of the operating temperature, diffuser size, nozzle throat diameter, and mixing chamber configuration on the COP and critical back pressure were investigated experimentally. It is found that the critical back pressure and COP can be increased by increasing the low temperature evaporator (LTE) temperature and pressure. Although an increase of the high temperature evaporator (HTE) temperature can increase the critical condenser pressure, the system COP does not increase as the HTE temperature increases. The diffuser size significantly affects the critical back pressure but had almost no effect on the system COP. A finned mixing chamber was tested at NXP = 0 mm and NXP = 36 mm. Compared with the regular mixing chamber, the finned mixing chamber can increase the critical back pressure.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of a steam ejector refrigeration cycle

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Figure 2

Photographs of the experimental steam ejector refrigeration system: (a) experimental system, (b) diffuser section, and (c) nozzle

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Figure 3

Schematic of the experimental system

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Figure 4

Geometries of the experimental ejector and pressure profile along the ejector

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Figure 5

NXP effect on the system COP

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Figure 6

NXP effect on the critical back pressure

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Figure 7

Effects of LTE temperature and critical back pressure on the system COP (HTE temperature = 130 °C and NXP = 86 mm)

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Figure 8

Effects of HTE temperature and critical back pressure on the system COP (LTE temperature = 10 °C and NXP = 86 mm)

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Figure 9

Performance map of the experimental steam ejector refrigeration system

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Figure 10

Comparison of the performance map for two different primary nozzles

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Figure 11

Diffuser effect on the system COP and back pressure (HTE temperature = 130 °C and LTE temperature = 15 °C and NXP = 56 mm)

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Figure 12

Mixing chamber effect on the system COP and back pressure at NXP = 0 mm

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Figure 13

Mixing chamber effect on the system COP and back pressure at NXP = 36 mm

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