General > General Technical Chat
EV-based road transportation is not viable
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Marco:

--- Quote from: Ice-Tea on February 21, 2023, 09:52:28 am ---Flamability range:

--- End quote ---
Detonation has far worse effects than deflagration.
bdunham7:

--- Quote from: tszaboo on February 21, 2023, 03:57:36 pm ---Heat is heat. There is no difference for heat pump heat or heat from a boiler or gas.

--- End quote ---

Imagine the outside temperature is 0C and you want to heat your house to 23C.  I supply you with an unlimited amount of water at 24C.  Can you heat your house with that?  After all, you have infinite heat available...
TimFox:

--- Quote from: bdunham7 on February 21, 2023, 04:31:52 pm ---
--- Quote from: tszaboo on February 21, 2023, 03:57:36 pm ---Heat is heat. There is no difference for heat pump heat or heat from a boiler or gas.

--- End quote ---

Imagine the outside temperature is 0C and you want to heat your house to 23C.  I supply you with an unlimited amount of water at 24C.  Can you heat your house with that?  After all, you have infinite heat available...

--- End quote ---

To heat the interior of your house to 23o C when the outside temperature is, say, 10o C requires delivery of hot air at a temperature above 24o C, even with reasonable wall insulation.
bookaboo:
I don't have a horse in the heat pump debate but found this interesting in the "against" column:


Marco:

--- Quote from: mikeselectricstuff on February 21, 2023, 04:10:48 pm ---heat pumps don't produce the higher temperatures needed to overcome poor insulation.

--- End quote ---

That depends a bit on what you use for heating. Floor/wall/ceiling hydronic heating can dump much larger amounts of heat into a home at a given water temperature than high temperature radiators, though that's a more involved retrofit (with floating laminate floors it's a relatively easy retrofit though, just raises the floor a tiny bit).

What is almost always an easy retrofit are Fan Coil Units, with the added advantage that they give you cooling too. I'm amazed no installers are specializing in this, it's such a perfect package.
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