Indirect Evaporative Cooling of Air to a Sub-Wet Bulb Temperature Ala Hasan AaltoUniversity, School of Science and Technology, Department of Energy Technology, Finland

Ala Hasan (1)

1 Department of Energy Technology

Indirect evaporative cooling is a sustainable method for cooling of air. The main constraint that limits the wide use of evaporative coolers is the ultimate temperature of the process, which is the wet bulb temperature of ambient air. In this paper, a method is presented to produce air at a sub-wet bulb temperature by indirect evaporative cooling, without using a vapour compression machine. The main idea consists of manipulating the air flow inside the cooler by branching the working air from the product air, which is indirectly pre-cooled, before it is finally cooled and delivered. A model for the heat and mass transfer process is developed. Four types of coolers are studied: three two-stage coolers (a counter flow, a parallel flow and a combined parallel-regenerative flow) and a single-stage counter flow regenerative cooler.

Mots clés: Indirect evaporative cooling; sub-wet bulb temperature; dew point approach

Domaines: Thermique [physics.class-ph]; Thermique [physics.class-ph]

Ala Hasan. Indirect Evaporative Cooling of Air to a Sub-Wet Bulb Temperature Ala Hasan AaltoUniversity, School of Science and Technology, Department of Energy Technology, Finland. Applied Thermal Engineering, 2010, 30 (16), pp.2460. ⟨10.1016/j.applthermaleng.2010.06.017⟩. ⟨hal-00675404⟩