Charging the Earth


Posted on Feb 5, 2014

I have also realised that my intentions for night air charging are possible, but unnecessary. When heating is going on (late March/early April) the boxes worked at night because air temp was better than glycol temp - that was helpful. Now that it is summer (we hope it stays that way) I have noticed three things: Morning Startup: The sunboxes don`t


Charging the Earth
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start up by themselves on cloudy days, until the heat-pump lowers the glycol sufficiently : good! this is saving pump power and the heat we would get down would not be worth the pump power. On cool days, the boxes come on when GSHP demands, support the GSHP in Realtime while it does a water heating cycle, then they turn off shortly after the GSHP goes back to sleep. This is good! On sunny mornings, the cold sensor is at Room temperature, say 22 C, so they will start up by themselves if the Sunbox temp rises to 27 C. (Startup is dependent on the temperature difference - I am finding that 5 degrees C is pretty well perfect balanced - ensures that pump is not on for excessive hours, but when it is, the heat being claimed is worth getting. ). Day gains-Night gains: The amount of power we get on sunny days is sooooo much that it`s not necessary to chase after small gains based on night time air temperatures (but I am willing to change my mind later in summer, depending on the datalogger finding. ) Night time action only occurs if the GSHP demands realtime heat. There`s no point in interseasonal night charging. Temperature reversal : The earth below the house is getting 8-16 kWhr per day. This disperses well, so there is no danger of chilling. At the end of a day, the temperature below is quite acceptable, sometimes higher than the morning temp. e. g. before we did this, the evening temperature might be 5. 8 but in the morning it...




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