| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a greenhouse-heating system utilizing a heat pump of the greenhouse in horticulture within a facility, capable of preventing the decrease of heat-exchanging efficiency at a low temperature. <P>SOLUTION: This greenhouse-heating system 1 includes an indoor machine 3 arranged at the inside of the greenhouse 2, an outdoor machine 4 arranged at the outside of the greenhouse 2, a ventilation duct 5 for ventilating the inside of the greenhouse 2, and a heat-accumulating duct 6 buried in the ground ranging from a part below the greenhouse 2 to a part below the outdoor machine 4. On the inside of the indoor machine 3, an air-blowing fan 21 and a condenser 22 are housed, and the heat pump is constituted by the condenser 22, an evaporator 24, a compressor and a capillary tube. When the temperature in the greenhouse 2 increased while stopping the heating operation, air in the greenhouse 2 is introduced into the heat-accumulating duct 6, and then returned to the greenhouse 2. Thereby, excessive heat in the greenhouse 2 is accumulated in the underground through the heat-accumulating duct 6. Meanwhile, at the time of low temperature, outside air is fed to the outdoor machine 4 through the heat-accumulating duct 6 and thereby the frost formation of the outdoor machine 4 is prevented. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
