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A study on ratios of the mass of water in tank to collector area for south-facing flat-plate solar water heating system used in Yunnan Province
Pages: 982-986
Year: Issue:  7
Journal: Rural Energy

Keyword:  solar water heating systemmass-area ratioflat-plate solar collectoroptimal tilt angle;
Abstract: The model for calculating the ratio of the mass of water in the tank to the area of the solar collector(the ratio is abbreviated as Mass Area Ratio or MAR) was established based on the energy output model of the flat-plate solar collector. The Mass Area Ratios were calculated by using the typical meteorological data of seven cities in Yunnan Province. The final water temperature in the water tank is60℃ in the calculation process. The ranges of the MARs have been given for seasonal or year-round operation of the flat-plate solar water heating system. To facilitate engineering applications, the quadratic fit relationship between the MARs and the tilt angles of the solar collector have been obtained with high correlations(R2>0.999). Further discussions found that the optimal tilt angles and the corresponding MARs for spring, summer, autumn, winter or year-round operation of the solar water heating system are respectively in 10~15 °,0~0 °,32~38 °,45~50 °,24~30 °,50~60 kg/m2,44~51 kg/m2,43~56 kg/m2, 44~58 kg/m2 and 46~52 kg/m2. Depending on the purpose of heating, the seasonal or year-round solar hot water systems can be optimized and designed by using the relationships and the optimal tilt angles in the paper.
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