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中南大学学报(英文版)

Journal of Central South University

Vol. 21    No. 10    October 2014

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Waste heat water pumping model with direct contact cooling
Kittiwoot Sutthivirode1, Naris Pratinthong1, Pichai Namprakai1, Natthaphon Roonprasang2, Taveewat Suparos3

1. Division of Energy Technology, School of Energy, Environment and Materials,
King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand;
2. Department of Alternative Energy Development and Efficiency Ministry of Energy,
Bureau of Energy Regulation and Conservation, Bangkok 10330, Thailand;
3. Department of Mechanical Technology Education, Faculty of Industrial Education and Technology,
King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand

Abstract:The performance of a patented water pumping model with steam-air power was presented, which operates automatically by direct contact cooling method. The main objective was to study feasibility of a pumping model for underground water. In this model, a heater installed within the heat tank represented sources of waste heat as energy input for finding appropriate conditions of the 10 L pump model. The system operation had five stages: heating, pumping, vapor flow, cooling, and water suction. The overall water heads of 3, 4.5, 6 and 7.5 m were tested. At the same time, it was found that the pump with 50% air volume is sufficient for pumping water to a desired level. In the experiment, the temperatures in the heating and pumping stages were 100-103 °C and 80- 90 °C, respectively. The pressure in the pumping stage was 12-18 kPa, and the pressure in the suction stage was about -80 kPa, sufficient for the best performance. It could pump 170 L of water at a 2 m suction head, 120 L at a 3.5 m suction head, 100 L at a 5 m suction head, and 65 L at a 6.5 m suction head in 2 h. A mathematical model for larger pumps was also presented, which operates nearly the same as the present system. Economic analysis of the 10 L pump was also included.

 

Key words: direct contact cooling; driving tank; steam-air power; liquid piston; waste heat

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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