ANALYSIS OF THE THERMAL PART OF THE SOIL OF A GREENHOUSE WITH DYNAMICSIMULATION

The overall energetical behaviour of a greenhouse is significantly aff ected by diurnal storage and nocturnal release of energy inside the so il, which is the only element with high thermal capacitance. Its speci fic part is analysed with a pre-existing dynamic simulation model. The first part of this paper studies the effects of 4 kinds of heating ex changers along each month of an entire cultivation period: hot air con vector, aerial metallic pipes with hot water circulation, radiant mulc h or buried pipes with warm water circulation. The second part develop s the hourly behaviour of both greenhouse and soil during a cold stand ard-day with each of the 4 exchangers. The third part is a sensibility study to various classes of factors in the case of hot air convector exchanger: climatic environment, control policy, intrinsic properties of the greenhouse (soil characteristics, crop density, cover transpare ncy).