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Posted: 1/25/2021 1:26:28 PM EDT
[#1]
Lol.
It’s using the ground instead of outside air as a transferring heat with refrigeration condensing/evaporating. Instead of the loud outside unit you have a water/refrigerant heat exchanger and a water pump and a giant hose in the ground. |
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Posted: 1/25/2021 1:28:18 PM EDT
[#2]
Quote HistoryQuoted: Old school geothermal before the term was co-opted by marketers meant hot water out of a drilled hole, or a hot spring. The subsurface temp in southern Missouri is 56F more or less. Enter any wild cave to find out. The temps across the country are available on maps. I am extremely skeptical of heat pumps that rely on low temperatures around ground source loops. See the explanation above in L_JE's post. Forget about air to air heat pumps in cold climates. Air to air Heat pumps got to -19. That’s right NEGATIVE 19F now a days. Better model units though. |
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Posted: 1/25/2021 1:32:32 PM EDT
[#3]
Quote HistoryQuoted: A sign of the times. Techs in the trades don't know what the fuck they are doing. There is no difference between air to air heat exchange or water to air, except for the heat exchanger and some different formulas to use. Could really throw these "techs" a curve ball and have them look at a water cooled chiller. For fucks sake what is this world coming to when an HVAC tech can't maintain a simple water to air system Really depends what we are talking about. Do we mean water treatment? Replacing the inline pump? That’s about the only different things. Water treatment is an entirely different thing. Water treatment I could see but the built in pumps not really. |
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Posted: 1/25/2021 1:37:10 PM EDT
[#4]
Quote HistoryQuoted: As they said. Far enough down and the ground is an ambient 50-60 degrees f. You run a coolant line down and let the coolant get to 50f then compress the shit out of it to raise the temp. Blow air across it to heat your house. Decompress and repeat. OR, Reverse the flow. Compress the shit out of it to raise the temp. Run it underground to cool to 50f. Decompress to drop the temp. Blow air across it to cool your house. Easy peasy, lemon squeezy. Drill far enough down and it gets Hot as HELL! 
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Posted: 1/25/2021 1:50:03 PM EDT
[#5]
Quote HistoryQuoted: planning an open loop system for the house we'll be building this year. Expecting the left to start crushing fossil fuels with taxes and other suppression. Trying to get the house as energy efficient as possible. Why open vs closed? Closed has more pros than open |
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Posted: 1/25/2021 1:56:49 PM EDT
[#6]
Quote HistoryQuoted: Drill far enough down and it gets Hot as HELL! user name checks out |
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Posted: 1/25/2021 4:06:56 PM EDT
[#7]
Quote HistoryQuoted: Why open vs closed? Closed has more pros than open Quote HistoryQuoted: Quoted: planning an open loop system for the house we'll be building this year. Expecting the left to start crushing fossil fuels with taxes and other suppression. Trying to get the house as energy efficient as possible. Why open vs closed? Closed has more pros than open How so? |
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Posted: 1/25/2021 5:15:32 PM EDT
[#8]
Quote HistoryQuoted: How so? Not having to rely on a water source. Not having to deal with sediment and other materials getting in your loop causing problems/extra maintenance |
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Posted: 1/25/2021 5:18:20 PM EDT
[#9]
Quote HistoryQuoted: Not having to rely on a water source. Not having to deal with sediment and other materials getting in your loop causing problems/extra maintenance Open gives you free hot tub water in the summer. 
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Posted: 1/25/2021 5:24:43 PM EDT
[#10]
Quote HistoryQuoted: Open gives you free hot tub water in the summer. Quote HistoryQuoted: Quoted: Not having to rely on a water source. Not having to deal with sediment and other materials getting in your loop causing problems/extra maintenance Open gives you free hot tub water in the summer. IIRC, even with a closed loop you can use a desuperheater to supplement heat to a hot water tank. Also, if you have well water, its free water already
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Posted: 1/25/2021 6:05:53 PM EDT
[#11]
Quote HistoryQuoted:Probably not going to be cost effective down here where we need 1 compressor per floor to keep the house cool in the summer, gas heat is cheap, and winters aren't very cold. Same issue here in Az. When the ground surface temp is very high in the summers, the solution requires very deep vertical wells. Most residential geothermal systems use horizontal pipes and don't go more than 10 feet deep. Typical cost to drill deep enough vertically here runs well over $40k, so it is not a system that offers economic advantages over air to air heat pumps. |
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Posted: 1/25/2021 6:12:38 PM EDT
[#12]
Quote HistoryQuoted: Why open vs closed? Closed has more pros than open Quote HistoryQuoted: Quoted: planning an open loop system for the house we'll be building this year. Expecting the left to start crushing fossil fuels with taxes and other suppression. Trying to get the house as energy efficient as possible. Why open vs closed? Closed has more pros than open We're still discussing this and other details. I believe the answer was it was a better fit for the property. Rocky soil makes the trenching for closed loops fairly involved. At the same time we have abundant accessible ground water for the wells used by an open system. Neighboring property has a natural spring that hasn't gone dry in living memory. |
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