| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for warming soil for greenhouse cultivation comprising use of a heat pump as a heat source device. <P>SOLUTION: The method for warming soil for greenhouse cultivation comprises setting up a heat pump 8 utilizing the air in the greenhouse 1 as a heat source, and circulating hot water or hot liquid heated via the heat pump 8 during day time to a heat-releasing pipe 4 buried under the ground having the depth of 40-80 cm from the ground surface 5 so as to heat soil 6 up to the ground temperature of 22°C (upper limit temperature). The heat pump set up in the greenhouse is improved in COP (heating ability based on consuming electric power) and heating ability because the temperature of the air in the greenhouse in day time is high even in winter, and thereby the energy-saving measurement for the greenhouse cultivation is improved. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
