Evaluation technique for the efficiency of the exhaust air heat recovery systems

Abstract

evaluation of active heat exchangers. The technique is designed to assess the energy characteristics of active utilizers under conditions that differ from the passport values. The influence of deviation of such operational factors as air consumption, outdoor temperature in front of the utilizer, the temperature and humidity of the exhaust air is considered. The method takes into account the operating mode involving the heating of the external air before being fed into the room without affecting the air-cooling mode in the warm season. Coefficients of renewability and economic efficiency are proposed as criteria for comparing active and passive heat recovery devices. The proposed criteria make it possible to evaluate the efficiency of using recycling systems both in energy and in financial terms.