9 ms·
The two are the same as far as my computation of my household’s reduction in energy usage is concerned. That is why I converted to the same units. As for needi
by ryao 2y ago
The two are the same as far as my computation of my household’s reduction in energy usage is concerned. That is why I converted to the same units.
As for needing 41MWh of heat, that is incorrect as my boiler was only 86% efficient and the one it replaced was even less efficient. It is also incorrect as the efficiency gains had reduced oil usage to 18MWh. Heat wise, I only need around 15MWh per year (although I likely needed more this year since it was particularly cold).
I have a suspicion that the ducted method of heat delivery used by my heat pump has more losses than the hot water system previously used to deliver heat. I had been sealing the central AC ducts in the winter to save a few hundred gallons of oil usage. I can no longer do that as heat is delivered via those ducts now.
- _aavaa_ 2y agoI don’t disagree with you about furnace efficiency. But my point still stands: You needed 18MWh of oil or 15MWh of heating. Neither of those numbers are how much electricity you will need to run a heat pump.
- ryao 2y agoDividing 15kWh by the average COP should determine it, although heat demands change from year to year and temperatures vary, causing not only the amount of heat needed to vary, but the average COP to vary too.
- 11101010001100 2y agoAsk yourself what is the difference between a heat pump and an electric resistance heater?
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- ryao 2y agoThis does not matter for total energy usage calculations unless you consider the environmental heat to be an input, but as far as the industry is concerned, it is free, which is why the COP for heat pumps is greater than 1.