Abstract
Increasing the temperature of inlet water is one way to increase solar distillation efficiency. Heat recovery using double glazing is a more straightforward way to raise the temperature of inlet water. In previous studies, the incoming water temperature was raised using additional equipment such as a solar water heater collector or utilizing the heat of wastewater from another water distillation system. The earlier studies' technique caused solar water distillation to be complicated, and the manufacturing cost was expensive. Heat recovery is a process of utilizing heat condensation of water vapor to increase the inlet water temperature. In conventional solar distillation, condensing heat is not used and wasted into the environment. Double glass is two glasses arranged in parallel, one on the top of the other. The distance between the glasses is 2 mm. The bottom glass is a 1 m 2 distillation cover glass. Water flows between the bottom glass and the top glass before entering the distillation model. The inlet water receives heat condensation so that the temperature rises. The increase in temperature causes heat loss to decrease and leads to efficiency improvement. This study aims to reveal the effect of heat recovery using double glazing to improve solar distillation efficiency. The study was conducted with laboratory experiments and simulations. The thickness of the bottom and top glass and the top glass area influence the heat recovery process. This study used two variations of glass thickness, namely 3 mm and 5 mm. The area of the top glass was varied by 0.1, 0.5, 0.7, and 1.0 m 2 . The maximum efficiency improvement compared to distillation without heat recovery obtained is 39.6 % with a glass thickness of 3 mm and 51.0 % with a glass thickness of 5 mm achieved in the variation of the top glass area of 0.1 m 2
Highlights
Distillation of water with solar distillation (SS) is an easy and inexpensive way to purify brackish water or seawater to become potable water, especially in remote areas
The increase in water yield and distillation efficiency can be seen from the comparison of the results of distillation water and the efficiency of the distillation model with heat recovery, i.e. the DG model compared to the SG distillation model that does not use the heat recovery process
More distillation water yields and higher efficiency from DG model distillation compared to SG model distillation are due to the inlet water temperature of
Summary
Distillation of water with solar distillation (SS) is an easy and inexpensive way to purify brackish water or seawater to become potable water, especially in remote areas. The inclined SS is a type of SS that is widely used. The efficiency of a conventional inclined SS is generally low [1]. The critical thing of SS design is that it can minimize heat losses and maximize the trapped heat energy [3]. The more heat energy trapped, the higher the distillation efficiency. The parameters that affect the amount of heat energy trapped are the heating time of the water in the absorber and the temperature of the inlet water [4, 5]. Modifying the shape of the absorber on inclined SS with grooves, fins, baffles, and partitions can increase the heating time of water in the absorber so that the water temperature increases [3]
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