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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

A Study on Heat and Mass Transfer for Air/Water Direct-Contact Air Conditioning System

Get access (open in a dialog) DOI: 10.1615/IHTC12.4760
6 pages

Sinopsis

Direct-contact air conditioning system, in which heat and mass are transferred directly between air and water droplets, has many advantages over the conventional indirect contact system. The purpose of this research is to investigate heat and mass transfer characteristics of direct-contact air conditioning system for various inlet parameters such as air velocity, air temperature, water flow rate and water temperature. Experimental apparatus comprises wind tunnel, water spray system, scrubber, demister, heater, refrigerator, flow and temperature controller, and data acquisition system. Inlet air is controlled by constant temperature bath, inlet water is controlled by electric heater and vapor compression refrigerator, and flow rate of air and water is controlled by inverter. Inlet and outlet conditions of air and water are measured when the air contacts directly with water droplets as a counter flow in the spray section of the wind tunnel, and heat and mass transfer rate between air and water are calculated. Droplet size of water spray is also measured using Malvern Particle Analyzer. In the cooling conditions, the outlet air temperature and humidity ratio decrease as the water flow rate increases and as the water temperature, air velocity and temperature decrease. On the contrary, the outlet air temperature and humidity ratio increase in the heating conditions as the water flow rate and temperature increase and as the air velocity decreases.