APPLICATION OF GEOTHERMAL ENERGY RESOURCES IN PROTECTED CULTIVATION IN CHINA
Geothermal energy resources, which have been found in about 2 000 places in China, are widely dispersed over the country. As early as two thousand years ago, these resources are applied to protected cultivation in China, but it is until recent ten years that they have been exploited on a large scale, many in Beijing, Tian Jing and Hebei province of the North China area. The temperature of the water is from 51°C to 118°C. During prospecting raw oil in the North China area, many geothermal fields have been opened up and the energy has been successfully applied to produce vegetables (e.g. cucumber and tomato) in heated greenhouses in winter, hence saving on coal and charcoal and reducing the expenses. because of the even heat supply, high quality, large quantity and being easily control, the geothermal greenhouses are quite welcomed both by producers and consumers. However, some problems also exist. They are mainly the pollution of harmful substance after draining away tail water and erotion of the temperature -raising pipes by geothermal water. These problems have to be solved urgently in case they will hinder the further application of geothermal energy in protected cultivation.
Fu-man, Z. and Bu-zhou, L. (1988). APPLICATION OF GEOTHERMAL ENERGY RESOURCES IN PROTECTED CULTIVATION IN CHINA. Acta Hortic. 230, 471-476