Greenhouse heating using geothermal energy

This paper describes the use of a low enthalpy geothermal source in Northern Greece to heat a greenhouse where ¯owers could be grown, especially roses. The di€erent parts of the developed greenhouse, the heat loss calculation and the heating system are described. An analysis is given of di€erent greenhouse heating approaches, and a description of the selection procedure, following low-cost and high-eciency criteria. An analysis is also made of an extended heating system, which uses low temperature water or direct geothermal ¯uid to heat a second greenhouse similar to the ®rst. The second greenhouse could be used for strawberry cultivation, where an inside temperature of 158C is required. The existing greenhouse, described in this paper, proved to be very important and bene®cial for this area of Northern Greece, with its numerous low enthalpy geothermal sources. # 1999 CNR. Published by Elsevier Science Ltd. All rights reserved.