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1 Transactions of the Institute of Fluid-Flow Machinery

1 2003

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Problems of condensation heat transfer in power plant heat exchangers

Butrymowicz D., Trela M.

Transactions of the Institute of Fluid-Flow Machinery

2003

nr 113

107-118

The paper deals with the problems of the influence of inert gases, vapour superheating, and fouling on condensation heat transfer in power plant heat exchangers. The performance estimation of a recuperative heat exchanger under conditions of fouling and presence of inert gases and vapour superheating is extremely important for the diagnostic codes of the turbine units. Basing on the one dimensional model the influence of fouling and air-concentration on the distribution of both the pertinent heater temperatures and heat flux was investigated. It appeared that inert gases play a dominant role in the case when its concentration is sufficiently high. It may be concluded that the proposed 1D model provides a very efficient method for heat transfer evaluation of heat exchangers. The effect of a strong vapour superheating on performance of heat exchanger has been discussed. It may be concluded that non-condensation zone in these heaters depends not only on vapour superheating but also on the heat transfer surface area.