USE OF BURIED PIPES FOR ENERGY-CONSERVATION IN COOLING OF AGRICULTURAL GREENHOUSES

Earth-to-air heat exchangers can be used for energy conservation, in c ooling of agricultural greenhouses. A parametric analysis performed fo r a typical glass greenhouse illustrates the effect of pipe length, pi pe diameter, and air velocity inside the pipes on the performance of t he system. Measured data of indoor air temperature collected from a 10 00 m(2) fiberglass covered greenhouse, equipped with four buried pipes , are compared with calculated data and are found to be in very good a greement.