Further when the thermal curtain is used along with the evaporative cooling the room air temperature in zone-II of greenhouse-1 and 2 is reduced by 6.0 C and 5.0 C with comparison to greenhouse without any treatment and 4.0 C and 3.0 C in case of greenhouse with evaporative
cooling only, during April month. For small cooling load inner thermal curtain should be preferred, due to zero energy requirement. Fig. 4b shows the hourly variation of room air temperature in zone-II of cascade greenhouse for May month.