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I wonder if it would be economical to make ground-fed heat pump that had piping built in together with house (dig out foundation, put piping for water-to-water
by ilyt 4y ago
I wonder if it would be economical to make ground-fed heat pump that had piping built in together with house (dig out foundation, put piping for water-to-water heat pump, build house), for the colder places.
- __MatrixMan__ 4y agoI'm told that (at least for the soil near my house) you want the ground source piping to make it down to the ground water because without that moisture the soil's capacity to transmit heat degrades over time.
- cyberax 4y agoYou really need to tap into a watertable for the ground-loop to work. Otherwise it'll be nothing but a huge PITA. And at this point in time, the best air-source heat pumps are good enough until -25C. Meaning that you get CoP more than 1 at this temperature. So this would work for most of the US just fine.
- wood_spirit 4y agoI have a “ground source heat pump” (a long pipe zig zagging under my lawn at about 2-3 foot depth) and kinda sandy soil and nobody mentioned no water table and it works great. Sand is not ideal but it’s not a blocker. The most common heap pumps use bore holes straight down into the rock here in Sweden, but lateral installs are marginally better performance (sun reheats soil every summer) if you have a big garden. Heap pumps dominate in Sweden so the installers have a lot of confidence and give good practical advise.
- c22 4y agoThe ground is only warm because it's heated all day by the sun. The ground under your house, less so.