HEATING APPARATUS OF GREENHOUSE FOR PROTECTED HORTICULTURE

摘要

PURPOSE:To obtain a sufficient amount of hot water without using underground water, by performing heat-exchange between hot air in greenhouse and circulating heat-source water in the daytime, heating circulating heat-accumulation water with a heat pump using the heat-source water as a low-temperature heat source and heating the greenhouse with heat dissipated from the heat- accumulation water in the nighttime. CONSTITUTION:Heat-collection efficiency is improved by the heat-exchange between circulating heat-source water 21 in a heat-collection water tank 2 cooled with a heat pump 3 and hot air in a greenhouse 5 in the daytime. The heat pump 3 is operated by using the circulating heat-source water (hot water) as a low-temperature heat source to accumulate hot water in a heat- accumulation water tank 4. Hot air is supplied to the greenhouse with a heat- exchanger 1 to enable the heating of the greenhouse in the nighttime without using fuels. Blight of crops can be prevented since the air is dehumidified in the heat-collection in the daytime.