| 摘要 |
A water vapor separating section (20), a compressor (30), and a main heat exchanger (40) are connected in that order to form a cycle system (12). The inside of the water vapor separating section (20) is divided by a water vapor permeable membrane (21) into an air space (22) and a water vapor space (23). A mixture of ventilation exhaust air and outdoor air is delivered, as heat source air, to the water vapor space (23). Water vapor contained in the heat source air passes through the water vapor permeable membrane (21), thereby being separated from the heat source air. The water vapor separated is compressed in the compressor (30) and thereafter delivered to the main heat exchanger (40). In the main heat exchanger (40), the water vapor from the compressor (30) condenses and to-be-heated air in a utilization system (13) is heated by heat of condensation of the water vapor.
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