| 摘要 |
An air conditioning system for a space comprising ducting extending from an entry end opening in the space to an exit end opening in the space; a heater element positioned in the ducting; a cooling loop including a compressor and an evaporator coil positioned in the ducting; a blower operative to move air through the ducting from the entry end to the exit end with the circulating air passing over the evaporator coil and over the heating device; bypass ducting extending around the evaporator coil; a damper controlling the movement of circulating air through the bypass ducting; a motor controlling the damper; sensors generating a signal indicative of the temperature of the air in the space, a further signal indicative of a humidity of the air in the space, and a further signal indicative of the temperature at the evaporator coil; and a controller receiving the signals and operative in response to the received signals to selectively modulate the motor to selectively modulate the damper and selectively modulate the volume of circulating air passing through the bypass ducting and selectively energize and de-energize the compressor and the heating device. The blower is operated at a substantially constant speed to provide a substantially constant air turnover rate in the system. Upon detection of a space air humidity value in excess of a predetermined set point value, the compressor is energized and the bypass damper is opened to allow circulating air to bypass the evaporator coil whereby to lower the temperature of the evaporator coil and upon the temperature of the evaporator coil dropping to a predetermined value proximate but in excess of freezing, the damper is closed to maintain the evaporator coil temperature just above freezing.
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