Simulated estimation of the optimum greenhouse orientation for solar energy gain in Antalya

8. SUMMARY A modelling study has been carried out by comparing the solar energy amount gained by greenhouses located at differ ent directions. In the study, incidence angle and solar ra diation level of the sun rays on the greenhouse have been taken into consideration for Antalya region. In the model developed, the climatic conditions, lati tude and altitude, azimuth angle and trarismittance of cover ing materials have been used as input data for carrying out calculations in a 486 Dx computer. In the model, diffused radiation, wind, reflection, the state of the covering mate rial (age, dust etc.), cloudiness and shadow effect have been assumed to be same for all greenhouses. The solar energy gain has been obtained for four different greenhouse positi ons located East -West, North-South, Southeast-Northwest and Northeast -Southwest. The results of this study indicated that Southeast -North west located greenhouses were more appropriate in terms of direct radiation gain in Antalya. However, if the assumptions used in the model are not taken into consideration, North- South location of the greenhouses can be suggested, due to the negative effects of the north winds on the heat loss from the greenhouse and the shadow. 42