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A Study on Improvement of Performance of Absorber in Absorption Heat Pump  

Min, Byong-Hun (Department of Chemical & Biochemical Engineering, University of Suwon)
Publication Information
Applied Chemistry for Engineering / v.19, no.3, 2008 , pp. 338-344 More about this Journal
Abstract
The improvement of energy conservation is mandatory to decrease consumption of fossil fuels and to minimize negative impacts on the environment which originates from large cooling and heating demand. The absorption heat pump technology has a large potential for energy-saving in this respect. Absorption heat pump is a means to upgrade waste heat without the addition of extra thermal energy. The higher performance of absorber is of great importance for absorption heat pump cycle. In this study, in order to improve the performance of absorber, the absorber of tangential feed of a liquid phase with spiral tube has been investigated using methanol-glycerine as a working fluid. The spiral tube and tangential feeding generate the turbulence into the liquid flow while increasing the mass and heat transfer coefficients. The simultaneous heat and mass transfer were found to take place in a liquid turbulent film in the absorber with the spiral tube during the process of gas absorption. By calculating mass and heat transfer coefficients by measurement of the concentration and the temperature of each position in the absorber, the entrance was found to be more effective in enhancing mass and heat transfer.
Keywords
absorption heat pump; absorber; spiral tube; methanol-glycerine; tangential feeding; simultaneous heat and mass trassfer;
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