Principal components of solar hot water systems are solar collectors and thermal storage tank. Hot water production is one of the most interesting applications in solar energy and the demand for hot water greatly increases particularly in the residential use. The optimization of the mass flow rate on cold side of the heat exchanger is seen to be an important factor for the energy saving. It is also demonstrated that the number of collectors that can be connected in series is limited. It is shown that the stratification within the storage is strongly influenced by mass flow rate and the connections between collectors. For the second, this paper shows the detailed analysis of water temperature within the storage and annual performances by varying the mass flow rate on the cold side of the heat exchanger and the number of collectors in series on the hot side. For the first system, the maximum average water temperature within the tank in a typical day in summer and annual performances are calculated by varying the number of collectors connected in series. s –1 and the total number of collectors is adjusted to 60. The mass flow rate by a collector is fixed to 0.04 Kg Two systems are proposed: 1) the first, Solar Direct Hot Water, which is composed of flat plate collectors and thermal storage tank, 2) the second, a Solar Indirect Hot Water in which we added an external heat exchanger of constant effectiveness to the first system. This paper shows the modeling of a solar collective heating system in order to predict the system performances. Keywords: Thermal Energy Flat Plate Collectors Stratification Solar Heating Systems Thermal Processes Laboratory (LPT), Research and Technology Center of Energy (CRTEn), Borj Cedria, TunisiaĮmail: Septemrevised Octoaccepted November 7, 2012
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