Solar water heater with glazed flat-plate collector

Solar water heater (SWH) is used to heat water by solar energy for domestic use containing:

• A domestic hot water storage part consisting of two storage tanks mounted in series (17) (18) (22) instead of a single tank (commonly used), to ensure the stability of the hot water temperature during the use, the hot water leaving the collector (19) enters the first tank (17) through its ‘cold water inlet’, the second tank (22) is supplied with water by the ‘hot water outlet’ of the first tank (18), the ‘hot water outlet’ of the second tank (21) is reserved for use. The collector (20) is supplied with cold water to be heated by the ‘cold water inlet’ (27) of the second tank.
• A heating part consisting of a solar collector (20) mounted in series in a closed loop with the two storage tanks, the collector is glazed in his two faces (35) (36), front face towards the sun glazed with glass (35) and back side with resistive and transparent plastic (36) to receive more solar radiation on the same absorbing surface and thus increase its temperature quickly and therefore faster water heating with less absorbing surface.
• A stainless steel sheet mirrors (40) (41) fixed on the system support (FIG. 7) to radiate the rear face of the collector, the fixed position and angle of the mirrors take into account position and angle of the collector (winter and summer position) and the relative rotation of the sun around the earth during the day and along the days of the year so that the radiation applied to the rear face of the collector is maximum during winter.
• A low energy consumption circulator integrated into the collector for gaining heat by cancelling out load losses that characterize the resistances to the passage of water in the SWH circuit (29)
• A guidance system to heat incoming cold water by passing through the collector before entering the storage tank (25-a) (25-b) to maintain the heat of water inside it.
• A support where the system (tanks+collector+mirrors) are fixed (FIG. 7).