3818 -- Indirect Evaporative Cooler with Condensation of Primary Airflow PDF

Introduces a new application for indirect evaporative cooling. This cooling principle may be used to cool and dehumidify closed greenhouses. A prototype indirect evaporative cooler with a cross-flow configuration was built and its performance was determined in an experimental facility. During tests under Dutch design conditions of the greenhouse and outside air, the plate temperature was less than the dew point of the greenhouse air, so condensation occurred. The rates of sensible and latent heat transferred from the greenhouse air by the prototype cooler were determined. Also, the influence of greenhouse and outside air conditions and airflow rates in the cooler on the enthalpy efficiency was studied. Although the amount of condensation in the prototype indirect evaporative cooler was large, the resulting climate in a closed greenhouse may be more humid than that in a conventional one.

KEYWORDS: greenhouses, indirect cooling, evaporative coolers, evaporative cooling, dehumidifying, cooling, prototypes, air flow rate, condensation, performance, experiment, testing, Netherlands, latent heat, outdoor air, humidity, indoor air, dehumidifying, heat content, efficiency, temperature, relative humidity