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International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 9    
Website: http://www.ijser.org
scirp IJSER >> Volume 3,Issue 9,September 2012
F-chart Method For Designing Solar Thermal Water Heating Systems 
Full Text(PDF, )  PP.69‐75  
Author(s)
I. F. Okafor and G. Akubue
KEYWORDS
f-chart method, solar energy, water heater
ABSTRACT
Solar energy systems convert solar energy into useful energy. But the performance of these systems depends on weather and exhibit a nonlinear dependence. This makes it difficult to accurately analyze their performance by simply observing their response to short-term or average weather conditions. Thus this work analyzes the use of f-chart method in designing liquid solar heating systems due to its simplicity and ability to estimate the fraction of total heating load supplied by solar heating system. This method is widely used in designing both active and passive solar heating systems, especially in selecting the sizes and type of solar collectors that provide the hot water and heating loads. It designs solar water heating system for a family of six in Nsukka community using f-chart method and the annual fraction of the load supplied is 0.44, indicating that 44% of the annual load is supplied by solar energy. It also presented the design considerations for long-term performance for the solar water heating system, f-chart validation and its limitations. Keywords: Solar energy, f-chart method, water heater. 
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