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This is WAY
off topic. Let's take it off the list if you need more
info.
I used
shallow-well ground water heat pump for both hot air and water for 12 years,
then sprung a leak. Heating house, 8 person hot-tub (450
gallon at 102
deg. F) and my 35,000 gallon swimming pool in summer, all on 54,000 BTU.
Repair is EXPENSIVE. Leaks will happen. But
there is way
too much adjusting to keep it working right; flow rates change, filters get
plugged. It required adjustment more than once a week
for the 12
years. They still aren't a general consumer product.
Larry
Elie
-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu [mailto:elec-trak-bounces cosmos phy tufts edu]On Behalf Of The Nauglers Sent: Sunday, May 02, 2004 5:40 PM To: elec-trak cosmos phy tufts edu Subject: (ET) Re: RE: Geothermal (off ET topic) Steve W. and others with an interest in geothermal
heat pumps,
Before I start let me say that I neither own stock
in or work for Nyle. This will be my last off topic post on the matter of
heat pumps. If you have questions either send me an e mail or go to the
Nyle web site.
I am very interested in the Nyle technology
though. They are developing a Cold Climate Heat Pump (CCHP) boiler.
I have wanted to get rid of my boiler for 15 years, but my baseboard heated
house cannot affordably be fitted with hot air ducts. Now here comes Nyle
with a heat pump that looks like it can heat water to 103 deg F just for
baseboard heat. I want to say goodbye to my noisy boiler, the ash dust
from burning oil, and the oil tank in my garage that takes up space where I want
my air compressor.
The limitations of today's standard non-geothermal
heat pumps have to do with the freons available and the limitation of the
compression ratio available in a single compressor. Thermodynamically
having a heat source at 55 deg F (geothermal ground) is only about 12 % more
efficient than having a heat source at 0 deg F. The Nyle has two
compressors staged, so the compression ratio of the system is theoretically the
compression ratio of the compressors multiplied by each other.
All I was trying to point out is that Nyle's CCHP
is so much more efficient than a standard heat pump at 0 deg F that it
approaches the efficiency of a geothermal heat pump even at 0 deg F. But
with a geothermal heat pump you have multiple wells or multiple trenches with
buried tubing. If you were to invest the difference in the installed cost
between a geothermal and a CCHP you would pay for the additional electric to run
the CCHP.
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