@article{oai:repository.naro.go.jp:00001762,
 author = {川嶋, 浩樹 and KAWASHIMA, Hiroki and 高市, 益行 and TAKAICHI, Masuyuki and 安場, 健一郎 and YASUBA, Ken-ichiro},
 journal = {野菜茶業研究所研究報告, Bulletin of the National Institute of Vegetable and Tea Science},
 month = {Feb},
 note = {We tested the performance of an air-to-air heat pump (HP) for both daytime and night-time cooling of a tomato greenhouse, and we investigated the effect of mulch on the night-time cooling load. After 1-1.5 h, when the power consumption of the HP became constant, the inside and soil temperatures were lowest in the treatment with flash-spun mulch (Dupont Tyvek), as the mulch decreased the soil heat flux (Q_s). The range of reductions in Q_s, enthalpy (h_in), absolute humidity, and relative humidity were largest in the white-black mulch (WB) treatment when the HP power consumption had stabilized. The differences in the enthalpy (△h_hp) and the absolute humidity between the outlet and inlet of the HP decreased in the order of Tyvek > white-black mulch (WB) > control, but the difference in the inside temperature decreased in the order of WB > control > Tyvek. Before cooling started, the soil temperature and Q_s decreased in the order of Tyvek > WB > control. Q_s was almost constant during the daytime in the mulch treatments. The mulch seemed to stop the daytime rise in soil temperature and the night-time Q_s from the soil to the greenhouse, thus reducing the night-time cooling load. The power consumption of the HP during cooling rose moderately as △h_hp increased and rose sharply when △h_hp exceeded about 14 kJ・kg'^1. Under continuous operation of the HP, the inside temperature and h_in were maintained at about 23℃ (cooling set point) and 58 kJ・kg'^1, respectively, when Q_s was between about -20 and -40 W・m^2 and solar radiation was between about 260 and 330 W・m^2. The inside enthalpy was about 71 kJ・kg'^1 when the inside temperature was 27℃ (set point for ventilation).},
 pages = {95--104},
 title = {トマト栽培温室における空気熱源式ヒートポンプの冷房運転の動作特性とマルチによる夜間冷房負荷軽減効果},
 volume = {10},
 year = {2011},
 yomi = {カワシマ, ヒロキ and タカイチ, マスユキ and ヤスバ, ケンイチロウ}
}