@article{oai:repository.naro.go.jp:00001663,
 author = {川嶋, 浩樹 and KAWASHIMA, Hiroki and 高市, 益行 and TAKAICHI, Masuyuki and 馬場, 勝 and BABA, Masaru and 安井, 清登 and YASUI, Kiyoto and 中野, 有加 and NAKANO, Yuka},
 journal = {野菜茶業研究所研究報告, Bulletin of the National Institute of Vegetable and Tea Science},
 month = {Mar},
 note = {A hybrid-heating system using an air-to-air heat pump (HP) and an oil-fired hot air heater (AH) for greenhouse heating was developed. Operating characteristics of this system were tested in a plastic greenhouse. The effects of energy saving and the reduction of carbon dioxide by the new system were estimated at Morioka, Nagoya and Miyazaki, which had different heating loads. The hybrid-heating system was controlled by a newly developed controller for a HP and an AH. The HP was primarily operated at the set point between ±1.0℃. After that, when the inside temperature decreased by 2.0℃ from the set point, the hybrid operation mode was started using both the HP and the AH. Nighttime temperatures in the greenhouse were well maintained at about the set point with the hybrid-heating system. The heating load of the HP was almost 100% above the outside temperature which was about 8℃ .When the heating load increased (when the outside temperature decreased below 8℃)， the ratio of the energy supplied by the HP (Qhp/Q) decreased. The ratio of the energy supplied by the HP (ΣQ_hp/ΣQ) was estimated to be larger in the order of Miyazaki> Nagoya> Morioka. The input energy saving with the hybrid-heating system was estimated to be from 30.6 to 58.6% compared with a conventional AH system. The hybrid-heating system could decrease the amount of oil consumption and the heating cost compared to a conventional AH system. The hybrid-heating system also decreased carbon dioxide emissions. The ratios of the reduction of the input energy, heating cost and carbon dioxide emissions of the hybrid-heating system to a conventional AH system were estimated to be larger in the order of Miyazaki> Nagoya> Morioka, but the amounts of the reduction of those were in the order of Morioka> Nagoya> Miyazaki.},
 pages = {27--36},
 title = {空気熱源式ヒートポンプを利用したハイブリット暖房方式による投入エネルギーおよび CO_2 排出量の削減効果},
 volume = {7},
 year = {2008},
 yomi = {カワシマ, ヒロキ and タカイチ, マスユキ and ババ, マサル and ヤスイ, キヨト and ナカノ, ユウカ}
}