Optimal Design and Test Research of Earth Tube Heat Exchangers in a Sun-Light Greenhouse

By means of comparative experimentation, this paper is intented to analyze the feasibility and practicality of raising pro warm vegetables in winter where the earth tube heat exchangers are used, and to give the objective and initial evaluation on the effect of saving energy and economic benefits of these facilities.In this paper, the idea and the method of optimal design of earth tube heat exchanger are proposed, and the computer programs of optimal design are developed.