A novel thermal water pump for circulating water in a solar water heating system |
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| Authors: | Natthaphon Roonprasang Pichai Namprakai Naris Pratinthong |
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| Affiliation: | 1. Key Laboratory of Cryogenics, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;2. University of the Chinese Academy of Sciences, Beijing 100039, China;1. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, PR China;2. Department of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, PR China |
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| Abstract: | This research purpose was to perform a parametric study of a novel thermal water pump well fitted in a simulated solar water heating system (SWHS). The SWHS was composed of a heating tank (HT), a hot water storage tank (ST) and an overhead tank (OT). The HT together with a specially designed valve act as a novel thermal water pump that gets power from hot water vapor and air pressure produced by a built-in electric heater in order to transfer heat from the HT to ST. The general operation of this pump has four stages for each cycle: heating, water circulating, vapor circulating and water supplying. The discharge water heads were varied with an increment of 0.25 m from 0.75 to 3 m. According to the experiment, it was found that the pump could operate at an average HT temperature of about 80–95 °C leading to 70–80 °C ST temperatures and 20–35 pumping cycles and consumed 17 MJ energy input during 9-h period. The overall thermal efficiency of the SWHS was 33–42% and the mean pump efficiency was about 0.005–0.011% depending upon the discharge heads. |
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