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The rotor speed and the degree of fouling of the transfer surfaces determines the degree of corrosion on heat-transfer surfaces of rotary heat exchangers.
These are used in preheating combustion air in coal-fired boilers. For example, by decreasing the rotor speed from 0.7 to 0.3 rpm, HF transfer can be halved, from 37% to 18%; if the cleanest heat-transfer surface is used, this transfer can be halved again, to 8%.
A modified entropy generation number for heat exchangers Xu, Z. M. et al.
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11 Engines (power generation and propulsion, electrical vehicles) compared to the rates obtained experimentally, the temporal evolution of some combustion parameters have been analysed and the influence of NN combustion simulation in global transient modelling has been presented.