Previous studies of condensation irrigation (CI) also exist. Widegren (1986) performed theoretical studies on a CI system that irrigated a land area of 1 ha by using a fan power of 3-10 kW [5]. Nordell (1987) constructed a small-scale plant in a greenhouse for cucumbers in Övertorneå, northern Sweden. This climate system was designed to reduce the difference in air temperature between day and night. During the day, humid air was circulated through buried drainage pipes, thus heating the ground and cooling the air. At night, the greenhouse air was heated by the ground. The injection of heat and air into the ground also speeded composting and advanced the start of the growing season. The system has operated successfully since 1987 [6].