Abstract
Fresh air load accounts for about 30% of air conditioning energy consumption. This paper introduced an air conditioning fresh air unit which combines solar air collector with indirect evaporative cooler. In summer, indirect evaporative cooler was used to precool fresh air, circulating water was used as spray water and the condensed water was used as supplement; in winter, solar air collector was used to preheat fresh air, and indirect evaporative cooler was used as sensible heat exchanger of primary air. The results of energy consumption calculation and analysis show that compared with the traditional fresh air handling unit, the energy saving of the air conditioning fresh air unit was 36.9% in summer and 64.0% in winter. The static investment payback period of the air conditioning fresh air unit was 3.7 years and the initial investment recovery period was 4.7 years.
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