EcoRenovator  

Go Back   EcoRenovator > Improvements > Geothermal & Heat Pumps
Advanced Search
 


Blog Register 60+ Home Energy Saving Tips Recent Posts Search Today's Posts Mark Forums Read


Reply
 
Thread Tools Display Modes
Old 10-21-14, 06:27 PM   #11
buffalobillpatrick
Master EcoRenovator
 
Join Date: Mar 2014
Location: Florissant, Colorado
Posts: 599
Thanks: 814
Thanked 59 Times in 55 Posts
Default

Balance Point Formula from post #1

Kwh = .16
Mcf = 8.00
constant of 10.25 converts Mcf to Therm
Boiler Eff = .85
Kwh in a Therm = 29.3

BP = ( .16 / (( 8.00 / 10.25) * (1 / .85)) * 29.3);

Gives correct result on Arduino: BP = 5.11


Last edited by buffalobillpatrick; 10-21-14 at 06:58 PM..
buffalobillpatrick is offline   Reply With Quote
Old 10-21-14, 06:48 PM   #12
Mikesolar
Master EcoRenovator
 
Mikesolar's Avatar
 
Join Date: Aug 2012
Location: Toronto
Posts: 958
Thanks: 40
Thanked 158 Times in 150 Posts
Default

Quote:
Originally Posted by buffalobillpatrick View Post
Thanks guys,
I can buy a flat plate HX on Ebay 5"x12" 30 plate, 120Kbtu for $150
I already have a 5gal unopened propylene glycol made for heating systems.

I could sleep better doing the 30% propylene glycol in everything outside house.
Not only is it 100' from house to HP in shop, it is also 75' from shop to Solar panels/tank.

Enthalpy of fusion - Wikipedia, the free encyclopedia

Also this opens the door to the possibility of using "Latent Heat of Fusion"
(enthalpy of fusion) by allowing ice to form around the HP source HX tubes in the 1,000g Solar tank.

This would only occur after a long period without Sun, and supports the bottom end of ESWT at 0*C increasing the Solar tanks heat capicity by about 2x

http://punktwissen.at/pdf/punktwisse...System-LEO.pdf

Laramie, Wyoming - Thermal Battery Systems | Thermal Battery Systems

I don't know if system would ever need to use 0*C ESWT as this would require my calculated economic "Balance Point" from post #1 to drop below a COP of about 5.0

BTW, has anyone checked my math?
OR
the thread idea presented?
Not checked your math but most manufacturers of HX rate the heat transfer at 20F dT, Your system may be different.
Mikesolar is offline   Reply With Quote
The Following User Says Thank You to Mikesolar For This Useful Post:
buffalobillpatrick (10-21-14)
Old 10-21-14, 07:05 PM   #13
buffalobillpatrick
Master EcoRenovator
 
Join Date: Mar 2014
Location: Florissant, Colorado
Posts: 599
Thanks: 814
Thanked 59 Times in 55 Posts
Default

So Mike your suggesting that when Ice forms around the HX that the ESWT would go below 0*C?

It would, but I don't know how much, I mostly was restating what I've read in the hyp for Ice storage.

Ice is a better heat conductor than water.
buffalobillpatrick is offline   Reply With Quote
Old 10-23-14, 06:04 AM   #14
Mikesolar
Master EcoRenovator
 
Mikesolar's Avatar
 
Join Date: Aug 2012
Location: Toronto
Posts: 958
Thanks: 40
Thanked 158 Times in 150 Posts
Default

Quote:
Originally Posted by buffalobillpatrick View Post
So Mike your suggesting that when Ice forms around the HX that the ESWT would go below 0*C?

It would, but I don't know how much, I mostly was restating what I've read in the hyp for Ice storage.

Ice is a better heat conductor than water.
Hmmmm, I'm not exactly sure how you want to pipe this but, I've been replacing a few flat heat exchangers in solar systems where (due to a controller failure) the glycol has continued to flow when it is -20 out and 3AM. There was no flow on the water side and the HX split. Eventually the concentration of glycol diluted enough that the panels and piping split as well. I am, thus, quite wary of creating ice around a HX unless you can ensure proper flow.

That said, I have to look at this ice box thingy a bit more.
Mikesolar is offline   Reply With Quote
The Following User Says Thank You to Mikesolar For This Useful Post:
buffalobillpatrick (10-24-14)
Old 10-24-14, 02:57 PM   #15
buffalobillpatrick
Master EcoRenovator
 
Join Date: Mar 2014
Location: Florissant, Colorado
Posts: 599
Thanks: 814
Thanked 59 Times in 55 Posts
Default

The Shocking Truth About Heat Pumps

http://www.energyvanguard.com/blog-b...formance-Homes

Last edited by buffalobillpatrick; 10-24-14 at 03:04 PM..
buffalobillpatrick is offline   Reply With Quote
The Following User Says Thank You to buffalobillpatrick For This Useful Post:
Mikesolar (10-24-14)
Old 10-25-14, 03:14 AM   #16
SDMCF
Apprentice EcoRenovator
 
Join Date: Jul 2014
Location: Finland
Posts: 125
Thanks: 5
Thanked 35 Times in 34 Posts
Default

Quote:
Originally Posted by buffalobillpatrick View Post
Quote:
The shocking truth about heat pumps is that they might well be a great fit for your home. Or they might not. It depends.
Well who would have thought it?
Does this really come as a shock to anyone?

SDMCF is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 11:51 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.
Ad Management by RedTyger
Inactive Reminders By Icora Web Design