سیستم گرمایش آب خورشیدی برای مصرف کنندگان مسکونی اسلام آباد، پاکستان: تجزیه و تحلیل سود هزینه

The excessive usage of fossil fuels for water heating purposes in Pakistan causes both economic and environmental problems. A potential solution to limit this problem is the increased uptake of SWHS as an alternative source of energy for providing hot water, displacing fossil fuel usage. SWHS are a comparatively modern technology; increased public awareness regarding the benefits attached to it is required to increase its adoption. The economic evaluation of SWHS is an essential assessment to conclude the feasibility of this system that may enhance public awareness of benefits attached to its adoption. This study presents cost benefit analysis of SWHS in residential sector of Islamabad, Pakistan. The results indicate that if SWHS replaces electric power and natural gas for water heating, it can save 430.95 Euro and 67.81 Euro of energy cost per annum per household, respectively. Depending on the initial installation cost of SWHS, the payback period varies from 1.16 to 1.38 years for electric power and 6.95–8.27 years for natural gas powered conventional water heating systems. Similarly, it can save 14.21 MMBtu of natural gas and an electric power of 4163.98 kWh annually which in turn reduces the emission of 2206.9 Kg CO2, 2.08 Kg SO2 and 3.75 Kg NOx per year.