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Calculating Boiler Standby Heat Loss
I figured I'd have a go at calculating the standby heat loss of my boiler. I'd appreciate if you guys could take a look and see if I've missed anything or done anything silly:
- First I shut off the boiler and circulation pumps so I'm only measuring the heat loss from the boiler at idle.
- Note that the boiler drops from 187F to 154F over two hours. That's not enough information though 'cause I don't know how much thermal mass that drop has taken place over.
- However I do know that the nozzle is rated at 2.75GPH and there are 138,500 BTUs in a gallon of oil.
- So I turn the boiler back on and measure it takes 6.9 minutes of firing to raise the temp from 154F to 190F. Therefore, given a nozzle at 2.75GPH, 43906 BTUs were added, and that means 1219 BTUs per degree.
- As we said, we know the boiler dropped 33F over 2 hours. Using the BTUs per degree calculated above, it lost 40247 BTUs, which means the BTU loss / hour must be 20123 BTUs / hr.
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