Optimal design of a small plate-type dew point indirect evaporative cooler with counter cross flow

Establishes a thermal and mass exchange model of a dew point indirect evaporative cooler and optimizes the geometric parameters, the internal flow form and the clapboard material of the cooler. Designs an internal flow form similar to counter flow with less inlet resistance and a new type of composite clapboard material with good water absorption and cost-effectiveness.  Experimentally studies the cooling performance of the composite clapboard cooler and compares it with other types of coolers. The results show that the thermal conductivity and the thickness of the clapboard have almost no effect on the performance of the cooler, but the water absorption of the clapboard material impacts the performance of the cooler through the heat and mass transfer area; the supply air temperature of the composite clapboard material cooler can be lower than the wet bulb temperature; the composite clapboard material cooler has smaller size under the same cooling capacity when comparing with other coolers using supply air rate per unit volume, providing a theoretical basis and technical support for applying the technology to the residential buildings.