研究目的
Investigating the design and performance estimation of solar heating systems using the f-chart method for residential-scale applications.
研究成果
The f-chart method is a useful tool for quickly estimating the long-term performance of solar heating systems of standard configurations. It allows for the estimation of the fraction of the annual heating load supplied by solar energy based on monthly average radiation and temperature, collector parameters, and estimates of loads. Despite some uncertainties, the method provides a reliable means for early design studies and general survey-type studies.
研究不足
The f-chart method provides estimates of annual useful outputs of solar processes but does not provide information on process dynamics. It is based on average data and may not accurately predict performance for any particular year. The method assumes well-built systems with uniform flow distribution to collectors and specific control strategies.
1：Experimental Design and Method Selection:
The f-chart method is based on correlations of the results of many hundreds of thermal performance simulations of solar heating systems. The conditions of the simulations were varied over appropriate ranges of parameters of practical system designs.
2：Sample Selection and Data Sources:
The method uses monthly average radiation and temperature data, collector parameters from standard collector tests, and estimates of loads.
3：List of Experimental Equipment and Materials:
Collectors with known FR(τα)n and FRUL values, storage tanks, heat exchangers, and auxiliary heaters are used.
4：Experimental Procedures and Operational Workflow:
The method involves calculating dimensionless parameters X and Y for each month, using these to determine the fraction of the load supplied by solar energy, and summing these to get the annual performance.
5：Data Analysis Methods:
The method correlates the results of simulations in terms of easily calculated dimensionless variables to estimate the fraction of the load supplied by solar energy.
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