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Posted By: tonymay be only 1 and 2b count?
Posted By: Cliff PopeOr is there a difference between "geothermal" and "ground-source"? Item (1) on the list is geothermal.
Posted By: fostertomIf that's the mechanism then GSHP does indeed mean that the ground it's extracting from does drop and drop in temp all winter - it does refrigerate the ground - and the summer replenishment cannot (in just one annual cycle) be to the same equilibrium temp that was previously established over many annual cycles.
Posted By: Paul in MontrealPosted By: JontiGeothermal has the negative effect of lowering the ground temperature significantly if used to intensively.Are you sure? For properly sized systems, I don't think there's any evidence of this ... though in parts of the US where the loops were undersized, the ground ended up warming up (most of the usage was A/C). In my location with 10x more heating degree days than cooling degree days, there has been no noticeable shift in ground temperature. Computed insulation values show that there's at least 7x more solar radiation received in a year than is taken out as heat in winter even with the assumption that the radiation has to be restricted to the small area of land the vertical loop is located in.Or do you mean real geothermal, where hot rocks are used to raise steam? In that case, you could be correct. What many people call geothermal is really "ground exchange".Paul in Montreal.
Posted By: JontiGeothermal has the negative effect of lowering the ground temperature significantly if used to intensively.
Posted By: JontiSecondly, to suggest that by extracting heat from the ground actually raises the temperature as you do...
Posted By: JontiPaul, you cannot get round the logic that if you extract something it will reduce in amount comparison to if you do not extract it. This is true regardless of the fact that the underlying temp. is rising or not.
Posted By: Ed DaviesNo he doesn't. PiM says that the ground is heated when the loop is used for air conditioning so inserting, rather than extracting, heat.
Posted By: fostertomPaul, what has to be explained about your anecdotal evidence, is why ground temp doesn't fall progressively over the winter and why it fully recovers by solar input over the summer (without the boost of dumped a/c heat). Maybe you have ground water movement bringing in a continuous supply of heat, thus diluting the cooling over a wide area? If so, then your system is an exception, or an alternative model, and doesn't provide answers to the Q kicked off by Jonti above.
Posted By: JontiAs to the second part of you question I find the lowering of the ground temperature by over extraction is no different and therefore just as bad as global warming raising temperatures.
Posted By: JontiCan you answer me how the sun heats up the ground that is below buildings?
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