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Clean energy farming is the agricultural activity to improve an efficiency of agricultural energy use and to replace fossil fuels. This study was carried out to establish the clean energy farming system in the controlled cultivation of vegetable crop (cucumber) adopting the biogas production facility. In order to design the clean energy farming system, mass and energy balance was analyzed between the controlled cultivation system and the biogas production facility. Net yearly heating energy demands (EYHED) of forcing and semi-forcing cultivation types were 48,697 and 13.536 Mcal 10 -1 in the controlled cultivation of vegetable cucumber. To cover these EYHED, the pig slurry of 511 and 142 m 3 10a -1 (biogas volume of 9,482 and 2,636 Nm 3 10a -1 , respectively, as 60% methane content) were needed in forcing and semi-forcing cultivation types. The pig slurry of 511 m 3 10a -1 caused N 1,788, P2O5 511 kg 10a -1 in the forcing cultivation type, and the pig slurry of 142 m 3 10a -1 caused N 497, P2O5 142 kg 10a -1 in the semi-forcing cultivation type. The daily heating energy demand (Ei,DHED) by the time scale analysis showed the minimum Ei,DHED of 7.7 Mcal 10a -1 day -1 , the maximum Ei,DHED of 515.1 Mcal 10a -1 day -1 , and the mean Ei,DHED of 310.2 in the forcing cultivation type. And the minimum Ei,DHED, the maximum Ei,DHED, and the mean Ei,DHED were 5.3, 258.0, and 165.1 Mcal 10a -1 day -1 in the semi-forcing cultivation type, respectively. Input scale of biogas production facility designed from the mean Ei,DHED were 3.3 and 1.7 m 3 day -1 in the forcing and the semi-forcing cultivation type. The maximum Ei,DHED gave the input scale of 5.4 and 2.7 m 3 day -1 in the forcing and the semi-forcing cultivation type.

Study for Clean Energy Farming System by Mass and Energy Balance Analysis in the Controlled Cultivation of Vegetable Crop (Cucumber)