Abstract
Use of 9-11℃ deep ocean water (D.O.W.) as a natural refrigerant through high-efficiency plate heat exchanger could produce 10-12℃ cool water, this cool water was piped to the air blower in D.O.W. cooling house and blowing 19-20℃ cool wind for flower forcing of Phalaenopsis. During the hot summer season, this system could maintain average daily temperature and day/night temperature at 21.9℃ and 23.9/20.0℃ respectively in 66 m^2 double plastic film greenhouse, that could be lower almost 10℃ than the outdoor temperature. Cultivars of Phal. Sogo Yukidian 'Ping Tung King', Phal. Hwafeng Redjewel, Dtps. Sin-Yaun Golden Beauty and Dtps. Queen Beer 'Red Sky' were 100 % be forced to bloom after forcing in D.O.W. cooling house. These 4 cultivars took about 100 days to bloom after forcing, the flowering quality of them was similar to the forcing greenhouse at high altitude and even better than air-conditioned cooling house at low altitude in Hualien county. The electric cost of Phalaenopsis flower forcing in D.O.W. cooling house was 13.3 NTD/pot, that was only half the cost of flower forcing at high altitude and was saved almost 80% cost of flower forcing at the air-conditioned cooling house.
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