The basic aim of this research work is to investigate the environmental, technical, and financial viability of evacuated tube type solar water heating (SWH) systems at different geographical locations across seven cities of India. The RETScreen SWH project model is used to evaluate the energy production and savings, solar fraction, costs, greenhouse gas (GHG) emission reductions, financial viability and risk factors for the SWH projects at the various locations. The financial viability of the SWH project is demonstrated by the parameters like simple payback period (SPP), equity payback period (EPP), internal rate of return (IRR), and modified internal rate of return (MIRR). The study shows that all sites have more than 60% of solar fractions and the gross GHG emission reduction for 25 years of project life is 739 tCO₂. The payback period obtained for seven occupants for the typical household is between 7 and 10 years except for Delhi and Indore. It can be also concluded that at least 50% incentives must be provided by the government to make such installation feasible.

这项研究工作的基本目的是调查印度七个城市不同地理位置的真空管式太阳能热水（SWH）系统的环境，技术和财务可行性。RETScreen SWH项目模型用于评估各个位置的SWH项目的能源生产和节约，太阳能分数，成本，温室气体（GHG）的减排量，财务可行性和风险因素。SWH项目的财务可行性通过简单的投资回收期（SPP），股权投资回收期（EPP），内部收益率（IRR）和修改的内部收益率（MIRR）等参数来证明。研究表明，所有场所的太阳能比例都超过60％，项目寿命25年的温室气体总排放量减少了739 tCO _2。。除德里和印多尔外，典型家庭的七个住户可获得的投资回收期为7至10年。还可以得出结论，政府必须提供至少50％的激励措施才能使这种安装可行。