Thermal efficiency and cost analysis of solar
2018-12-17 · The cost of solar water heater made in Rwanda by Tumba College of Technology is 900 with 2.77 m2and 200 L of tank capacity. This solar water heating system is sufficient per day for a family of four members. The cost of electricity in Rwanda is 0.15 per kwh. Payback period(in years)=Capita investmentAnual saving.
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