Posted by rz on December 29, 2003, 11:55 pm
I am building a home in Sequim, WA. It is 3100 sq. ft, radiant floor heated
with a GSHP.
The ground loop is 400' x 6' deep with three parallel .75" id tubes at 6'
deep. They return at 4' deep.
The compressor is a 3 ton Copland Digital Scroll. Hot water will be
provided via the superdeheater.
The installer says that I will get 120-127 F domestic hot water without
resistive heat. He also
says that the heat pump will provide domestic hot water in the summer, when
no heating or cooling
is required. I'm wondering if anyone has an opinion on how efficient this
method of hot water
heating will be. The external walls are SIPs.
Also, I will have a 64 100 watt panel PV grid tie system. I plan on using
the frigid output of the
ethanol group loop coolant to cool the solar panels. These particular
panels gain about 13 watts
for every 20 degree reduction in temperature (at a nominal 100 watt output
level) The heated coolant
will then enter the ground loop.
At my prior home I had 60 Solerex 120 panels. I was amazed at the increase
in power output
just by spraying off with the garden hose.
Any opinions on this? (Other than: "are you nuts??")
rzeff (at) nikolaREMOVE_THIS_PART (dot) com
Posted by Niels Lyck on January 5, 2004, 7:21 pm
I think it sounds interesting to cool the solar cell panels and use the
collected energy in a heat pump, if I understand your intentions correctly.
Here in Denmark, a scientific experiment combining solar cells and ordinary
solar thermal in the same panels was unsuccessful, as the temperature needed
for the thermal conversion was too high for the cells to work properly.
What I dont understand is how you get the thermal fluid past the panels -
are they of a special kind? And how will the system perform in the cold
months - do you plan on any thermal yield here?
Niels Lyck, www.vvfs.dk
Posted by News on January 6, 2004, 12:42 pm
Nick's friend, or was he a friend, also did this with some success. If I
recall rightly he had PV cells that get hot underneath. The water passed
under the cells and heated the water. The cooled cells performed better
producing more electricity. So, this killed two birds with one stone. I
assumed the PV cells would only pre-heat the water and conventional panels
would take the temperature higher.
Was I right?
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Posted by RZ on January 18, 2004, 7:10 am
I will use the same aluminum spreader plates that I use for the raiant floor
heating, shown here:
I will glue them to the back of the solar panels.