METHOD FOR AUTOMATIC CONTROLLING AIR VOLUM OF BLOWER BY CHANGE OF REFRIGERANT FLOW OF DIRECT EXPANSION AIR HANDLING UNIT

摘要

PURPOSE: A method of automatically controlling the air volume of a blower based on refrigerant flow variation is provided to create agreeable air-conditioning environment since circulating air flowing in an air-conditioner and air volume discharged to the inside are appropriately supplied. CONSTITUTION: Blowing operation is performed by the drive of an intake blower and an exhaust blower. The opening position of an electric expansion valve is 100% through a controller, and an air-conditioner is operated(S100). The indoor temperature is set up(S200). The difference between indoor temperature and preset temperature is determined(S300). The controller operates the outdoor unit if the indoor temperature is lower than the preset temperature(S400). A refrigerant temperature sensor senses the temperature of refrigerant(S500), and whether the temperature of the refrigerant reaches the preset temperature or not is determined. If the temperature of the refrigerant reaches the preset temperature, the opening degree of the electric expansion valve is reduced, and the volume of the outdoor unit is controlled(S600).