**Calculator Notes & Restrictions:** This is a simplified calculation model. It cannot calculate a solar fraction. The load (# of people, heating demand, building type, pool size, etc.) cannot be defined.
This calculator does not deliver exactly the same results as Polysun. It’s based on a simpler, but still reasonably precise calculation process.
Available solar energy based on site latitude and longitude, corresponding with 5-year weather database archives for the specific zip code. The calculated energy savings results assumes that the residential hot water energy load is larger than what the solar thermal system can produce.
* Assumes 80% boiler efficiency. |