|Rendering of mirrors before they went up,|
including the vertical corner ones
As an assessment of the contribution of my 'diddly-squat' mirrors', let's look at total kWh divided by total number of hours, from the time that I installed the hour-timer in mid-April. This rules out freak results from single exceptional high or low days, by having time periods that are measured in months, not hours.
The average capture of the Sunboxes:
- with No mirrors from late April -mid Sept, nearly 5 mos =1.11 kW
- with Top Mirror only from mid Sept -mid Oct, 1 mo =1.43 kW
- with both Top and Bottom Mirror from mid Oct -early Dec, nearly 2 mos =1.93 kW
As Chris points out below, the increase in kW is also connected to pump speeds and hours of activity of the GSHP, which we discuss in the comments, and I add a bit more in a posting of 8th Dec.
Even if the bigger idea of interseasonal charging does not produce an improvement in the COP of the heat pump, I think and hope I have the confidence of my immediate technical group (Chris, David A and Blaise) in the general idea, and time will prove us right or wrong.... by next May for getting through the winter, and by next October for assessing the summer build up. So far, the results of my deep ground temperatures are proving me right, but I need longer to know if the electrical consumption of the GHSP will be reduced annually.
But let's rejoice at small victories...
....with the months of testing before and after, I would declare the Mirrors to be a success.