Hi,
I would like to calculate by hand the amount of money saved per one year when one installs Solar Hot Water system, in comparison with conventional electric system. Precondition is that Solar fraction percentage is known in advance (70%).
It does not need to be accurate, just a sort of rule of a thumb.
For example:
I was wondering if somebody could comment on this.
Is the formula for daily load correct (Average annual solar radiation / Solar fraction) ?
Daily load would be the daily energy demand for particular residential house.
Thank you.
I would like to calculate by hand the amount of money saved per one year when one installs Solar Hot Water system, in comparison with conventional electric system. Precondition is that Solar fraction percentage is known in advance (70%).
It does not need to be accurate, just a sort of rule of a thumb.
For example:
Location: Los Angeles
SWH collector area: 4 m2 (43.05 ft2)
Solar fraction = 0.7 (data taken from NREL base case report)
Tilt angle: 34 degrees (location's latitude)
Orientation: south
Average annual solar radiation: 5.96 kWh/m2/day (data taken from http://maps.nrel.gov/prospector)
Energy cost per kWh: 0.20 $/kWh
----------------
daily load = Average annual solar radiation / Solar fraction = 5.96 / 0.7 = 8.52 kWh/m2/day => 8.52 * 4m2 = 34.08 kWh/day
Annual savings = 365 days * 34.08 kWh/day * 0.20 $/kWh = 2488 $
SWH collector area: 4 m2 (43.05 ft2)
Solar fraction = 0.7 (data taken from NREL base case report)
Tilt angle: 34 degrees (location's latitude)
Orientation: south
Average annual solar radiation: 5.96 kWh/m2/day (data taken from http://maps.nrel.gov/prospector)
Energy cost per kWh: 0.20 $/kWh
----------------
daily load = Average annual solar radiation / Solar fraction = 5.96 / 0.7 = 8.52 kWh/m2/day => 8.52 * 4m2 = 34.08 kWh/day
Annual savings = 365 days * 34.08 kWh/day * 0.20 $/kWh = 2488 $
Is the formula for daily load correct (Average annual solar radiation / Solar fraction) ?
Daily load would be the daily energy demand for particular residential house.
Thank you.
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