Abstract
An individual solar collector and two partly freight cylinders filled with molten salts embedded storage tank were connected to each other and forced circulated water by electric pump to improve the thermal performance of residential solar hot water tank. Multi flow rates of 25, 50 and 70 l/h. used to achieve an appropriate flow rate of circulating water. The calcium nitrate tetra hydrate Ca(NO3)2-4H2O and magnesium nitrate hex hydrate Mg(NO3)2-6H2O were mixed to form cheap binary molten salts base on different weight ratios. These molten salts combined could be used as both sensible heat materials and latent heat storage materials, besides they can directly use as heat transfer fluid due to freezing temperature. Six samples of different mixing ratio of molten salts had tested to assess the thermal analysis of each sample. The result indicated that the mixture 60%Ca(NO3)2+40%Mg(NO3)2 had the best performance for thermal storage tank with melting point of 38°C and the thermal value is 8.7 mW, and thermal stability of molten salts were noticed by DSC 60 SHIMADZSU devise.
Highlights
Because of the limitation of fossil fuel resources and environmental pollutions which created by this type of fuel it was necessary to find a useful tool to storage energy and increasing energy efficiency
An individual solar collector and two partly freight cylinders filled with molten salts embedded storage tank were connected to each other and forced circulated water by electric pump to improve the thermal performance of residential solar hot water tank
The result indicated that the mixture 60% Ca(NO3)2+40%Mg(NO3)2 had the best performance for thermal storage tank with melting point of 38°C and the thermal value is 8.7 mW, and thermal stability of molten salts were noticed by differential scanning calorimeter (DSC) 60 SHIMADZSU devise
Summary
Because of the limitation of fossil fuel resources and environmental pollutions which created by this type of fuel it was necessary to find a useful tool to storage energy and increasing energy efficiency. The solar thermal research centres worked on developing and improving storage systems, as they worked to increase efficiency through the use of storage fluids with a low melting point and higher thermal stability through the use of molten salts. In this work binary molten salts Calcium nitrate tetra hydrate Ca(NO3)2-4H2O and magnesium nitrate hex hydrate Mg(NO3)2-6H2O with low melting point were used in six different ratio mixtures by weight, the samples were prepared and analyzed. Thermal energy storage tank (TES) consist of two coils filled with water and immerse in a two metal Refills contain a binary molten salts with weight ratio [60% Ca(NO3) and 40% Mg(NO3)2] respectively were choose according to high thermal objectivity of salt mixture, and the weight of the molten salt for each capsule was 430 g.
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