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In this paper, the impact of variable air flow rate on the performance of the solar collector function of the Climate Curtain is evaluated. Climate Curtain is a new type of window curtain developed by the company Climate Curtains AB in Sweden. This curtain consists of several layers of stagnant air, and the solar collector function of this curtain captures some part of solar radiation striking the window; warmer air is forced into the room by fans mounted inside the curtain. The paper presents general and handy formulas which can be used to determine the impact of the curtain and its solar collector function, on the total net heat gain in the room. The solution presented is applicable on similar vertical air gaps to evaluate energy performance.

Impact of Variable Air Flow Rate in Energy Smart Window Curtains, on the Total Net Heat Gain- Analytical Solutions