HEAT REMOVAL FROM STEAM ENGINE USING THERMAL CHIMNEY: SIZE OF HEAT EXCHANGER
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Abstract
Heat removal from a thermal power plant by using a thermal chimney is a direct air-cooled system to reduce the disadvantages of the wet-cooling tower system. The air underneath the chimney is heated up by receiving the removed heat from the power plant to a surface heat exchanger. The heated air flows up the chimney due to a natural convection. The problem of this approach is that the heat exchanger may be larger and more expensive than the wet-cooling system. Therefore, it must be investigated the viability. Theoretical analysis was performed by creating a mathematical model to study the effect of design parameters, which are: tube bundle spaces, tube diameters, tube lengths, and air velocities at the base of the chimney. These parameters should affect the size of heat exchanger and the total chimney height. In this primary study, the tube bundle of the heat exchanger was an in-line type without fining. The results show that the transverse pitch ratio at the first tube-row equal to 3.0 and longitudinal pitch ratio equal to 1.25 are the best design point. The smaller tubes and higher air velocities can reduce the size of the heat exchanger, but the chimney height will increase.
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The published articles are copyright of the Engineering Journal of Research and Development, The Engineering Institute of Thailand Under H.M. The King's Patronage (EIT).
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