Precision temperature and humidity controller

摘要

PPROBLEM TO BE SOLVED: To provide a precision temperature/humidity control method and its device which reduced power consumption. PSOLUTION: In air-conditioned air SA whose temperature and humidity is controlled by installing a reheater 20 on the blowing side of an evaporator 19 for cooling an outside air OA, by introducing a part of hot gas coming from a compressor 14 into the reheater 20, by reheating air cooled by the evaporator 19 with that hot gas and by humidifying the reheated air with a humidifier 21, this method and its device is provided with: a blowing-out temperature control part 40 for controlling diversion ratio of a three-way proportional control valve 16 based on a set temperature and the temperature of the air-conditioned air SA; a blowing-out humidity control part 41 for controlling humidification quantity at the humidifier 21 with a set humidity and the humidity of the air-conditioned air; and a humidification output control part 45 for generating control output to the humidifier 21 and a control output for controlling an operation frequency of an inverter device 27, an opening degree of an electronic expansion valve 17, and a cooling water amount to a condenser 15 based on input in advance of a humidification output set value SP6 to be the minimum humidification amount. PCOPYRIGHT: (C)2004,JPO