A refrigeration and air-conditioning apparatus comprising: a compressor that compresses a refrigerant; a condenser that condenses the refrigerant compressed by the compressor; air-sending means that sends air toward the condenser; expansion means that reduces a pressure of the refrigerant condensed by the condenser; and an evaporator that evaporates the refrigerant reduced in pressure by the expansion means, wherein a refrigeration cycle is formed by a refrigerant circuit including the compressor, the condenser, the expansion means, and the evaporator, the refrigeration and air-conditioning apparatus further comprising: cooling-fluid sending means 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 means 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 (24a, 24b) 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. a compressor that compresses a refrigerant; a condenser that condenses the refrigerant compressed by the compressor; air-sending means that sends air toward the condenser; expansion means that reduces a pressure of the refrigerant condensed by the condenser; and an evaporator that evaporates the refrigerant reduced in pressure by the expansion means, wherein a refrigeration cycle is formed by a refrigerant circuit including the compressor, the condenser, the expansion means, and the evaporator, the refrigeration and air-conditioning apparatus further comprising: cooling-fluid sending means 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 means 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 (24a, 24b) 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. cooling-fluid sending means 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 means 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 (24a, 24b) 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. 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 (24a, 24b) 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.