VARIABLE EFFECTIVENESS HEAT RECOVERY VENTILATOR

摘要

A heat recovery ventilator includes an outgoing duct having an outgoing airflow, an incoming duct having an incoming airflow, a heat exchange fluid circulating through a closed-loop heat exchange duct to transfer thermal energy between an outgoing airflow in the incoming airflow, a heat exchange pump within the closed-loop heat exchange duct for circulating the heat exchange fluid within the closed-loop heat exchange duct, a sensor located in the outgoing duct, and a controller coupled to the sensor and the heat exchange pump and programmed to cause the heat exchange pump to circulate the heat exchange fluid within the closed-loop heat exchange duct at an initial rate of circulation, receive a signal from the sensor associated with at least a temperature of the outgoing airflow, determine, based on the signal, that the temperature of the outgoing airflow is at or below a threshold temperature, and in response to determining that the temperature is below the threshold temperature, cause the pump to circulate heat exchange fluid at a reduced rate of circulation thereby adjusting the effectiveness of thermal energy transfer between the outgoing airflow to the incoming airflow.