Analysis of the efficiency of air-to-air heat exchanger with a periodic change in the flow direction

摘要

The results of experimental investigation and physical-mathematical modeling of heat transfer in the air-to-air heat exchanger with a periodic change in the airflow direction for room ventilation are presented in the paper. Based on the joint analysis of heat balances in the airflow and in material Of heat exchanger packing, the model for calculating heat exchanger operation was suggested. The results of calculations by the suggested model are in satisfactory agreement with the experimental data. The dependence of operation efficiency of heat exchanger on air flow rate is determined theoretically and experimentally; it is found out that operation efficiency of the device increases linearly with decreasing flow rate. It is shown that a change in the ratio of flow rates of opposite airflows through the heat exchanger can regulate the temperature of air, supplied into a room. The possibility to use this model for optimization of operation and construction parameters of the heat exchanger is shown. (C) 2015 Elsevier Ltd. All rights reserved.