This 19th century invention is becoming the technology of the future. (via KnowableMag)
The cold-climate problem is arguably less of an issue than some think, however, given that there are multiple modern air source devices
Innovations in heat pump design are leading to units that are even more efficient, better suited to houses with low levels of insulation and — potentially — cheaper, too. For example, Yu says his and his colleagues’ novel air source heat pump design could improve the COP by between 3 percent and 10 percent, while costing less than existing heat pump designs with comparable functionality. They are now looking to commercialize the technology.
And there are plenty more ideas afoot. Greenough, for instance, has experimented with storing heat in the ground during warmer months, where it can be exploited by a heat pump when the weather turns cool. His design uses a circulating fluid to transfer excess heat. That raises the temperature of the soil by around 22 degrees Fahrenheit, to a maximum of roughly 66 degrees Fahrenheit, he says.
Like air conditioners running in reverse, heat pumps such as the one being installed here use refrigerants to capture heat from the outdoors and move it indoors to heat the house.as a refrigerant.
In some situations, home-by-home installations of heat pumps might be less efficient than building one large system to serve a whole neighborhood. For about a decade, Star Renewable Energy, based in Glasgow, has been building district systems that draw warmth from a nearby river or sea inlet, including a district heating system connected to a Norwegian fjord.
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