Monday, January 17, 2011

Deep ground still good

17 Jan '11 : I am somewhat amazed at the ability of the ground to recover, thermally. Although we haven't had much sun recently, we haven't been drawing much heat out of the ground either, due to the mild weather. So the ground has not been chilling hugely. However, since the turn of the year, the ground temperature is gradually rising. From nearly dipping below 10.0, it has been warming, 10.2, 10.4 and now 10.6 degrees in successful weeks. It has been a slight coincidence that on the Sundays when I take a reading there has been a bit of Sun showing, and therefore some activity from the sunboxes, but these have not been more than 6 kWh in a single day - and always in winter time mode, i.e. driven by delta-T and well below 10 degrees while running.
    If they run, they are effectively restoring temperature more quickly if the holes have chilled. i.e. If the sunbox temp was 12 degs,  they might run liquid down at 5 degs for some minutes after the GSHP had dropped the loop down to -0.4 degs.
   My measuring conditions are strictly identical, the machine turned off for 4 hours beforehand to allow temperatures to settle down.

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