A positive ventilation air chiller.

This paper gives an outline of the work that has been carried out in developing a positive ventilation chiller. The demand for air cleaning equipment in public areas and work places (especially where smoking is permitted) had previously prompted the development of a highly innovative ventilator, featuring a combination of ventilation, recirculation and filtration of air. A refrigeration system was successfully retrofitted into the ventilation unit. The chiller is aimed at improving the working and living environment where modem air conditioners are beyond affordability. It will be particularly useful in developing countries where ambient temperature is often in excess of 30°C. A prototype positive ventilation air chiller was designed, built and fully instrumented. Experimental investigations were made in a test chamber sectioned into indoor and outdoor rooms. The chiller demanded approximately 590W at outdoor temperatures of 30°C. A cooling power of 817 W was achieved at a useful coefficient of performance of 1.39 with a maximum air temperature drop of 10°C.