ECONOMICS OF SOLAR WATER HEATERS
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ECONOMICS FOR “ATASH” SOLAR WATER HEATERS – FPC- DOMESTIC SYSTEM |
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| Sr. No. | Parameters used | ||
| a. | Electricity tariff | 6.00 | Rs. per unit |
| b. | One unit of electricity (calorific value) | 860.00 | Kcals |
| c. | Electrical heater efficiency | 90.00 | % |
| d. | Available calorfic value of 1 unit | 774.00 | Kcals |
| e. | No. of days the system is fully used in the year | 290.00 | Days |
| Economic Worksheet | |||
| a. | Capacity | 250.00 | Litres |
| b. | Hot Water outlet temperature | 60.00 | deg. C |
| c. | Cold water INLET temperature | 28.00 | deg. C |
| d. | Temperature to be raised by | 32.00 | deg. C |
| e. | Heat gained per day | 8000.00 | Kcals |
| f. | Electric units saved per day | 10.34 | Units |
| g. | Electricity saved per year in Units ( 290 days) | 2997.42 | Units |
| h. | Electricity saved per year in RUPEES | 17984.50 | Rs. |
| i | Cost of the “ATASH” SOLAR WATER HEATER | 40000.00 | Rs. |
| j | Less MNRE Subsidy | 0.00 | Rs. |
| k | Approximate cost of piping | 10000.00 | Rs. |
| l | Installed cost of system | 50000.00 | Rs. |
| n | Depreciation of 80% in the first year on Subsidised cost of the system | 0.00 | Rs. |
| o | Tax saving @30% on depreciation | 0.00 | Rs. |
| p | Final Cost of system | 50000.00 | Rs. |
| q | Payback period | 2.78 | Years |
| ECONOMICS FOR “ATASH” SOLAR WATER HEATERS – FPC COMMERCIAL SYSTEMS | |||
| Sr. No. | Parameters used | ||
| a. | Electricity tariff | 11.00 | Rs. per unit |
| b. | One unit of electricity (calorific value) | 860.00 | kcals |
| c. | Electrical heater efficiency | 90.00 | % |
| d. | Available calorfic value of 1 unit | 774.00 | kcals |
| e. | No. of days the system is fully used in the year | 290.00 | days |
| Economic Worksheet | |||
| a. | Capacity | 3000.00 | litres |
| b. | Hot Water outlet temperature | 60.00 | deg. C |
| c. | Cold water INLET temperature | 28.00 | deg. C |
| d. | Temperature to be raised by | 32.00 | deg. C |
| e. | Heat gained per day | 96000.00 | kcals |
| f. | Electric units saved per day | 124.03 | units |
| g. | Electricity saved per year in Units ( 290 days) | 35968.99 | units |
| h. | Electricity saved per year in RUPEES | 395658.91 | Rs. |
| i. | Cost of the “ATASH” SOLAR WATER HEATER | 360000.00 | Rs. |
| j | Less MNRE Subsidy | 0.00 | Rs. |
| k | Approximate cost of piping | 120000.00 | Rs. |
| l | Installed cost of system | 480000.00 | Rs. |
| n | Depreciation of 40% in the first year and 40% on the balance in the 2nd year and son on. | 230000.00 | Rs. |
| o | Tax saving @30% on depreciation | 70000.00 | Rs. |
| p | Final Cost of system (l-o) | 410000.00 | Rs. |
| q | Payback period (p/h) | 1.05 | Years |