As global radiation increases, the ambient temperature, inside ground temperature and inside room temperature also increases and when global radiation decreases all the above parameters also decreases. Figs. 4 and 5 illustrates the variation of ambient temper- ature, inside ground temperature and inside room temperature of the North wall insulated greenhouse dryer in both conditions. For the Case-I inside ground and room temperature were found always higher than the Case-II. For Case-I, the maximum temperature dif- ference between inside room and ambient were 17.7 °C at 14 h,
19.4 °C at 14 h & 15 °C at 15 h respectively for day 1, day 2 & day 3