[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: (ET) Re: RE: Geothermal (off ET topic)



Title: RE:  Geothermal (off ET topic)
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.
 
Steve Naugler
snaugler earthlink net
----- Original Message -----
Sent: Sunday, May 02, 2004 4:10 PM
Subject: (ET) RE: Geothermal (off ET topic)

Hi all,

I know this is off topic, but had to comment.  Keep in mind that a geothermal system uses the ground as both a heat source and a cold source; that is, it takes advantage of the ground's constant 50-55 degree temp. and pulls heat from it in winter, and pulls cold from it in summer.  So, if you need A/C as well as heat, geothermal is an awfully nice, efficient way to go.  As an added bonus, there's no racket from the outdoor heat exchanger.  We've had geothermal for over 3 years now and really like it.  Plus, if you were ambitious, you could use PV to further reduce operating costs, as the geothermal can be all electric (even the backup heat).

Ok, back to your regularly scheduled programming...

Steve W.


_______________________________________________
Elec-trak mailing list
Elec-trak cosmos phy tufts edu
https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak