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Re: heatpump vs furnace

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bill.sloman@ieee.org wrote...
> Winfield Hill wrote:
>> dcaster@krl.org wrote...
>>> Bill Sloman wrote
>>>> Using a buried heat-exchanger coil also made sense - about 50cm
>>>> of dirt is about six months of thermal lag, so some of the heat
>>>> you pumped into the ground in summer could still be hanging
>>>> around in winter when you needed to pump it back out - but
>>>> it's even more capital investment.
>>>
>>> All of the data I have seen on soil temperatures does not agree
>>> with your statement of 50 cm giving a six months thermal lag.
>> 
>>  Right, it's entirely a matter of the available water.
>>  Maybe a small well, tapping an underground aquifer.
>>  Slightly complicated if you don't have a well.
>
> It isn't. You just bury a long enough loop pf closed pipe
> and circulate your water - other heat exchange fluid -
> through it. You need to be in contact with a much larger
> thermal mass than the heat capacity of your house. 

 Exactly, and for the time period in question.  Here the
 ground can freeze down nearly a foot in winter.  We get
 a situation where the ground below that is devoid of
 much water.  That's a problem that has cost us several
 valuable trees, because we didn't water them midwinter!

 I could solve that problem by running the pipe 100 feet
 down to a stream that runs through our back yard, and
 burying it deep there.  Maybe get a 45-degree return
 fluid temperature in winter.  The pipe would have to
 be insulated and buried the whole way, difficult with
 our yard's granite rock fill.  A geothermal heat sink
 would be good for more efficient AC in summer.  Might
 need our town's Conservation Commission permission.
 I've been thinking about it.  Guy who installed our
 system has a geothermal hot-water heater, using an
 existing well on his lot.  Research geothermal heat
 pumps.  Probably just too many issues to overcome.


-- 
 Thanks,
    - Win

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10 mega-watt hours Winfield Hill <hill@rowland.harvard.edu> - 2016-10-07 11:16 -0700
  Re: 10 mega-watt hours Jon Elson <jmelson@wustl.edu> - 2016-10-07 14:13 -0500
    Re: 10 mega-watt hours Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2016-10-07 12:41 -0700
      Re: 10 mega-watt hours makolber@yahoo.com - 2016-10-07 13:08 -0700
        Re: 10 mega-watt hours Winfield Hill <hill@rowland.harvard.edu> - 2016-10-07 14:27 -0700
      Re: 10 mega-watt hours Winfield Hill <hill@rowland.harvard.edu> - 2016-10-07 14:09 -0700
        Re: 10 mega-watt hours Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2016-10-07 14:18 -0700
          Re: 10 mega-watt hours Ralph Barone <ralph@invalid.com> - 2016-10-07 22:40 +0000
            Re: 10 mega-watt hours Winfield Hill <hill@rowland.harvard.edu> - 2016-10-07 16:42 -0700
              Re: 10 mega-watt hours Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2016-10-07 17:35 -0700
                Re: 10 mega-watt hours Jeff Liebermann <jeffl@cruzio.com> - 2016-10-08 09:09 -0700
                Re: 10 mega-watt hours John Larkin <jjlarkin@highlandtechnology.com> - 2016-10-08 09:53 -0700
                Re: 10 mega-watt hours Jeff Liebermann <jeffl@cruzio.com> - 2016-10-08 11:10 -0700
                Re: 10 mega-watt hours Bob Engelhardt <BobEngelhardt@comcast.net> - 2016-10-09 12:30 -0400
                Re: 10 mega-watt hours Jeff Liebermann <jeffl@cruzio.com> - 2016-10-09 10:26 -0700
                Re: 10 mega-watt hours Ralph Barone <ralph@invalid.com> - 2016-10-08 23:38 +0000
                Re: 10 mega-watt hours Jeff Liebermann <jeffl@cruzio.com> - 2016-10-08 18:13 -0700
                Re: 10 mega-watt hours Ralph Barone <ralph@invalid.com> - 2016-10-09 05:02 +0000
                Re: 10 mega-watt hours Jeff Liebermann <jeffl@cruzio.com> - 2016-10-08 23:29 -0700
          Re: 10 mega-watt hours Chris Jones <lugnut808@spam.yahoo.com> - 2016-10-09 11:42 +1100
  Re: 10 mega-watt hours Martin Riddle <martin_ridd@verizon.net> - 2016-10-07 17:30 -0400
    Re: 10 mega-watt hours Winfield Hill <hill@rowland.harvard.edu> - 2016-10-07 17:14 -0700
      Re: 10 mega-watt hours Jon Elson <elson@pico-systems.com> - 2016-10-11 10:28 -0500
        heatpump vs furnace Winfield Hill <hill@rowland.harvard.edu> - 2016-10-12 05:57 -0700
          Re: heatpump vs furnace bill.sloman@ieee.org - 2016-10-12 07:33 -0700
            Re: heatpump vs furnace "dcaster@krl.org" <dcaster@krl.org> - 2016-10-12 17:41 -0700
              Re: heatpump vs furnace bill.sloman@ieee.org - 2016-10-12 18:26 -0700
                Re: heatpump vs furnace "dcaster@krl.org" <dcaster@krl.org> - 2016-10-13 06:45 -0700
              Re: heatpump vs furnace Winfield Hill <hill@rowland.harvard.edu> - 2016-10-12 18:57 -0700
                Re: heatpump vs furnace bill.sloman@ieee.org - 2016-10-12 22:36 -0700
                Re: heatpump vs furnace Winfield Hill <hill@rowland.harvard.edu> - 2016-10-13 03:57 -0700
          Re: heatpump vs furnace Ecnerwal <MyNameForward@ReplaceWithMyVices.Com.invalid> - 2016-10-12 10:33 -0400
            Re: heatpump vs furnace Winfield Hill <hill@rowland.harvard.edu> - 2016-10-12 09:46 -0700
              Re: heatpump vs furnace Ecnerwal <MyNameForward@ReplaceWithMyVices.Com.invalid> - 2016-10-12 14:39 -0400
          Re: heatpump vs furnace Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2016-10-12 08:10 -0700
            Re: heatpump vs furnace Winfield Hill <hill@rowland.harvard.edu> - 2016-10-12 09:39 -0700
          Re: heatpump vs furnace makolber@yahoo.com - 2016-10-12 13:02 -0700
            Re: heatpump vs furnace Winfield Hill <hill@rowland.harvard.edu> - 2016-10-13 06:10 -0700
          Re: heatpump vs furnace "David Eather" <eather@tpg.com.au> - 2016-10-15 14:47 +1000
            Re: heatpump vs furnace krw <krw@nowhere.com> - 2016-10-15 10:56 -0400
              Re: heatpump vs furnace "David Eather" <eather@tpg.com.au> - 2016-10-17 12:47 +1000
                Re: heatpump vs furnace krw <krw@nowhere.com> - 2016-10-17 19:50 -0400
  Re: 10 mega-watt hours sean.c4s.vn@gmail.com - 2016-10-12 06:13 -0700
  Re: 10 mega-watt hours Yzordderrex <powersupplyguy@netzero.net> - 2016-10-13 07:52 -0700
    Re: 10 mega-watt hours Winfield Hill <hill@rowland.harvard.edu> - 2016-10-13 08:09 -0700
      Re: 10 mega-watt hours Yzordderrex <powersupplyguy@netzero.net> - 2016-10-14 03:05 -0700
        Re: 10 mega-watt hours Winfield Hill <hill@rowland.harvard.edu> - 2016-10-14 05:52 -0700

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