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Shell-and-Tube or Plate Heat Exchangers

By Yu.A. Kuzma-Kichta, P.A. Savelyev and K.M. Lodvikov

Abstract

The calculations of heat and hydraulic characteristics and influence of apparatus with intensifiers size analysis to heat exchanger potential of equipment were made onto the basis of known experimental data recommendations. Calculations data were received in a range of parameters, that are typical for a heat and water supply systems. It was obtain, that in studied range of Reynolds’s number, the most better heat transfer coefficient value is for the tubes with dimpled interface with Re<3*10,3 and in case a swirl tubes by Re>3*103. Under the stipulation of scales, the heat transfer coefficient for a swirl tube and tube with circular knurl in a beginning is decreasing, and then comes out on a constant, whereas for a smooth tube – monotonically decrease in time. Pressure losses in heat exchanger with twisted tubes are almost the same as in case of smooth tubes. Pressure losses in heat exchanger with dimpled tubes are less than in case of smooth tubes

Topics: heat transfer, hydraulic friction, scales.
Publisher: RTU
OAI identifier: oai:ortus.rtu.lv:4835
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