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Research Papers

Experimental Investigation of Steam Ejector System With an Extra Low Generating Temperature

[+] Author and Article Information
Jingming Dong

Institute of Marine Engineering
and Thermal Science,
Marine Engineering College,
Dalian Maritime University,
Dalian 116026, China
e-mail: dmudjm@hotmail.com

C. L. Kang, H. M. Wang

Institute of Marine Engineering
and Thermal Science,
Marine Engineering College,
Dalian Maritime University,
Dalian 116026, China

H. B. Ma

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

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received August 27, 2015; final manuscript received December 20, 2015; published online February 3, 2016. Assoc. Editor: Steve Cai.

J. Thermal Sci. Eng. Appl 8(2), 021017 (Feb 03, 2016) (5 pages) Paper No: TSEA-15-1242; doi: 10.1115/1.4032483 History: Received August 27, 2015; Revised December 20, 2015

A steam ejector system is environmentally friendly but limited to utilizing thermal energy with a temperature typically ranging from 100 °C to 200 °C. As the steam generating temperature decreases, the utilization of the thermal energy from such a low-temperature heat source becomes very challenging. In this investigation, an experimental steam ejector system was designed and constructed to investigate the performance of the ejector system with water as the working fluid at steam generating temperatures ranging from 40 °C to 60 °C. A convergent nozzle and a de Laval nozzle were used in the steam ejector as the primary nozzles, respectively. The experimental results show that the steam ejector at a generating temperature ranging from 40 °C to 60 °C can function. The performance of the convergent nozzle is a little better than that of the de Laval nozzle in most cases at the given working condition. For power plant or desalination system applications, the system coefficient of performance (COP) of the ejector with convergent nozzle could reach 3.06 when the steam generating temperature is 40 °C and the evaporator temperature is 25 °C. For refrigeration application, the ejector with a de Laval nozzle can achieve a system COP of 0.21 and 0.4 at a generating temperature of 60 °C. The results of this investigation enabled a better understanding of system performance characteristics in a steam ejector system at a generating temperature below 100 °C.

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Figures

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Fig. 1

Schematic of the experimental system

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Fig. 2

Dimension of the experimental ejector

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Fig. 3

Variation of system COP with the condensing temperature for nozzle 2

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Fig. 4

Performance map of the steam ejector refrigeration system with convergent nozzles

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Fig. 5

System COP comparison between the convergent nozzle and de Laval nozzle (Te = 20 °C)

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Fig. 6

System COP comparison between the convergent nozzle and de Laval nozzle (Te = 25 °C)

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Fig. 7

Variation of system COP with the condensing temperature for nozzle 4

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