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PERFORMANCE SIMULATION OF MULTI-ROW DRY (AND / OR WET) HEAT EXCHANGERS

A. H. Elmahdy
National Research Council of Canada, Ottawa, K1A OR6

Ronald C. Biggs
Canada Department of Public Works, Ottawa, K1A OM2

Abstract

A mathematical model is developed to perform row-by-row simulation- of finned-tube heat exchangers during cooling or cooling and dehumidification processes. Numerical solution of this model gives the air, water and tube surface temperatures and the air specific humidity after each row of tubes along the coil depth. The average heat transfer coefficient on the air side is calculated using an empirical formula that relates the average heat transfer J-factor with the air-side Reynolds number. Experimental and analytical results (outlet air and water conditions, sensible and latent heat rates) of 4- and 8-row coils showed good agreement during both cooling or cooling and dehumidification processes. This model can be used as an algorithm for coil performance simulation, which represents a part of general computer programs used for conducting energy analysis on HVAC systems in buildings.

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