Refrigeration and air-conditioning apparatus and humidity control device

A refrigeration and air-conditioning apparatus comprising:

• a compressor that compresses a refrigerant;
• a condenser that condenses the refrigerant compressed by the compressor;
• an air-sending unit that sends air toward the condenser;
• an expansion unit that reduces a pressure of the refrigerant condensed by the condenser;
• and
• an evaporator that evaporates the refrigerant reduced in pressure by the expansion unit,
• wherein a refrigeration cycle is formed by a refrigerant circuit including the compressor, the condenser, the expansion unit, and the evaporator,
• the refrigeration and air-conditioning apparatus further comprising:
• a cooling-fluid sending unit that sends, to the evaporator, a cooling fluid that exchanges heat with the refrigerant and does not involve a change in phase in the evaporator;
• and
• a first heat exchanger that exchanges heat between ambient air and the cooling fluid that has undergone heat exchange at the evaporator,
• wherein a first cooling-fluid circuit is formed by annularly connecting the evaporator, the first heat exchanger, and the cooling-fluid sending unit by using a pipe,
• the refrigeration and air-conditioning apparatus further comprising:
• a first air-sending unit that sends air to the first heat exchanger;
• a first moisture absorbing-and-desorbing device and a second moisture absorbing-and-desorbing device that are provided at a flow passage of the air sent by the first air-sending unit and that are disposed in front of and behind the first heat exchanger;
• and
• an air-path switching device that reverses a passing direction of air passing through the first moisture absorbing-and-desorbing device, the first heat exchanger, and the second moisture absorbing-and-desorbing device.