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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

INVESTIGATION ON AVERAGE NUSSELT AND SHERWOOD NUMBERS IN INDIRECT EVAPORATIVE COOLING WITH COUNTER-FLOW CONFIGURATIONS

Get access (open in a dialog) DOI: 10.1615/IHTC16.her.021890
pages 4701-4707

Résumé

Indirect evaporative cooler, regarded as an environmentally friendly and inexpensive cooling technology for air conditioning, has been received considerable attention in recent years. Traditional correlations for the average Nusselt and Sherwood numbers in indirect evaporative cooling with counter-flow configurations are not comprehensive enough as they cannot indicate the effects of inlet parameters on heat and mass transfer processes. Therefore, this paper presents an in-depth investigation on the average Nusselt and Sherwood numbers using a method proposed by our previous study. In the previous study, a similarity analysis was carried out to deduce the 2-D mathematical model equations into dimensionless forms by introducing some dimensionless variables. Then, the solution of the dimensionless equations for the average Nusselt and Sherwood numbers becomes several functions of dimensionless factors. In present paper, the key objective is to extend the functions to develop the correlations for the average Nusselt and Sherwood numbers based on the dimensionless factors: αL, Rws, Rep, θs,i and θw,i. The definition of the inlet dimensionless temperature takes into account the effects of the primary air inlet dry-bulb temperature and the secondary air wet-bulb temperature. Numerical simulations are performed by changing the value of each dimensionless factor under a constant value for other parameters. The validity of data is investigated by comparing with existing data provided by literature. Finally, the simulation results are regressed to obtain the empirical constants of the correlations. These developed correlations would provide a useful tool to predict the thermodynamic performance of indirect evaporative cooler.