A Theorethical Mathematical Model for Energy Balance in Greenhouses

Abstract

A mathematical model for greenhouse climate which consists of a set of algebraic equations was developed. The equations were written for four parts of a greenhouse: outdoor air, indoor air, surface and ground surface not covered by crop. It was assumed that the air is well mixed in the greenhouse, the thermal properties of building materials does not change in time and solar radiation passing through the transparent material without absorption. Model input parameters are ambient air temperature, solar radiation values on the surface, normal solar radiation on the surface, soil temperature inside the greenhouse and soil temperature at a depth of 5 cm. A computer program was written in C ++ language.