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re: ground source heat pumps
30 oct 2005
stuart grey wrote:
>nicksanspam@ece.villanova.edu wrote:
>> john w. hall wrote:
>>
>>>"solar flare" wrote:
>>>
>>>>what heat?
>>>>
>>>>where does it come from? the frozen ground above it?
>>>
>>>perhaps from the same source as volcanos etc - molten iron and
>>>assorted components (some of which are still undergoing radioactive
>>>decay) of the earth's core.
>>
>> and sun and warm air on the ground.
>
>are you talking some form of shallow geothermal?
sure. loops in a trench or a pond, and so on. the deep ground temp is
about the same as the average yearly air temp. if we make it colder
locally over the winter, heat will flow in from around the cold spot
to warm it up over the rest of the year. the main mechanism for upward
heatflow in the ground is evaporation in lower layers, vapor transport
through soil porosity, and condensation in upper layers.
>yes, there may be a workable temperature difference, but there is not
>enough heat flow, as someone pointed out, your cold sink is going to
>heat up quickly.
how much is enough?
nick
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