EcoRenovator  

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


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


Reply
 
Thread Tools Display Modes
Old 12-23-17, 01:02 PM   #11
DonT
Lurking Renovator
 
Join Date: Feb 2016
Location: Northwood, Iowa
Posts: 27
Thanks: 2
Thanked 5 Times in 5 Posts
Default

Jeff, you are correct, that's why I'm starting with adding a mixing valve to my current system. that way I can track what the max and min water temp needed for my home. I plan to install 4 temp sensors (Hot water in from boiler and return to boiler. Mixed water supply to and return from floor)

DonT is offline   Reply With Quote
Old 12-25-17, 08:52 AM   #12
jeff5may
Supreme EcoRenovator
 
Join Date: Jan 2010
Location: elizabethtown, ky, USA
Posts: 2,428
Thanks: 431
Thanked 619 Times in 517 Posts
Send a message via Yahoo to jeff5may
Default


Cheapie hand control knob jobber, max outlet temperature is around 60 degC:
https://www.amazon.com/dp/B01MS3X57O...a-351414738935
Dude diesel has lots of solenoid valve choices for cheap:
http://www.dudadiesel.com/valves.php
jeff5may is offline   Reply With Quote
Old 12-25-17, 09:28 AM   #13
jeff5may
Supreme EcoRenovator
 
Join Date: Jan 2010
Location: elizabethtown, ky, USA
Posts: 2,428
Thanks: 431
Thanked 619 Times in 517 Posts
Send a message via Yahoo to jeff5may
Default

Quote:
Originally Posted by DonT View Post
that's what I do now but when the temp drop's from 25° during the day to 5° at night the water temp I have set does not keep up. that's way I'm looking at a mixing valve
Ok, so when your heading demand increases, your system cannot satisfy the increase in demand? You are hinting at an outdoor reset or setpoint type of PID control to auto adjust your supply water temperature. Again, this works very well with a big fat slab. With a hanging pipe or staple up system, you don't have the "thermal mass flywheel" to level out the heat supplied to your zones, nor the higher thermal efficiency of direct contact conduction that heat spreaders provide.

If your floor isn't radiating enough heat, it needs to be made to do so before you start reducing your heat source. Once it can " burn you out" of your heating zones, then the duty cycle or source temperature can be lowered.

Tekmar has some awesome stuff to look at in their support section:
http://www.tekmarcontrols.com/suppor...oor-reset.html
From the linked page, just browse around the related topics to get a good picture of the how and why this stuff works.

Last edited by jeff5may; 12-25-17 at 10:02 AM..
jeff5may is offline   Reply With Quote
The Following User Says Thank You to jeff5may For This Useful Post:
DonT (12-26-17)
Old 12-26-17, 06:35 AM   #14
DonT
Lurking Renovator
 
Join Date: Feb 2016
Location: Northwood, Iowa
Posts: 27
Thanks: 2
Thanked 5 Times in 5 Posts
Default

thanks Jeff. I looked at the valves and found a 4 way that might work, but they want way to much for the motor and control, about $800.
DonT is offline   Reply With Quote
Old 12-26-17, 07:32 AM   #15
jeff5may
Supreme EcoRenovator
 
Join Date: Jan 2010
Location: elizabethtown, ky, USA
Posts: 2,428
Thanks: 431
Thanked 619 Times in 517 Posts
Send a message via Yahoo to jeff5may
Default

Oh I never said the tekmar stuff was inexpensive. Quite the contrary. Caleffi and uponor are comparable brands of the same type of equipment. If I was s building scientist or architect trying to heat and cool my bio-dome or skyscraper, I would consider using something along these lines. I was referring to the training and support materials and literature these guys provide, because that's how the super pros do it.

If I was going to make something like that, I would probably use one of the 3 way valves and adjust it by hand or use an outdoor reset valve if I wanted a set it and forget about it type of rig. There are lots of ways around the barn, so to speak, and some ways are much more economical than others. Using "bang bang" valves (zero pressure solenoid) and anti water hammer bladders is most likely the cheapest way to do it. Not so smooth and quiet though.
jeff5may is offline   Reply With Quote
Old 12-26-17, 08:43 AM   #16
DonT
Lurking Renovator
 
Join Date: Feb 2016
Location: Northwood, Iowa
Posts: 27
Thanks: 2
Thanked 5 Times in 5 Posts
Default

I did read some of the literature. I will get a 4way valve and see if I can use a stepper motor to set the temp
DonT is offline   Reply With Quote
Old 12-29-17, 08:32 PM   #17
buffalobillpatrick
Master EcoRenovator
 
Join Date: Mar 2014
Location: Florissant, Colorado
Posts: 599
Thanks: 814
Thanked 59 Times in 55 Posts
Default

https://www.supplyhouse.com/Taco-I07...nsor-5203000-p

These work great
buffalobillpatrick is offline   Reply With Quote
The Following User Says Thank You to buffalobillpatrick For This Useful Post:
jeff5may (01-01-18)
Old 01-01-18, 08:34 PM   #18
jeff5may
Supreme EcoRenovator
 
Join Date: Jan 2010
Location: elizabethtown, ky, USA
Posts: 2,428
Thanks: 431
Thanked 619 Times in 517 Posts
Send a message via Yahoo to jeff5may
Default

Those taco odr valves are the bee's knees. They're the automatic version of the knob jobbie I linked to before. They don't care about what kind of heat source you have, so for an intermittent source like solar or wood fired boiler, they work like magic.

Last edited by jeff5may; 01-02-18 at 11:20 AM..
jeff5may is offline   Reply With Quote
The Following User Says Thank You to jeff5may For This Useful Post:
buffalobillpatrick (01-02-18)
Old 01-02-18, 10:01 AM   #19
DonT
Lurking Renovator
 
Join Date: Feb 2016
Location: Northwood, Iowa
Posts: 27
Thanks: 2
Thanked 5 Times in 5 Posts
Default

so how does the outdoor reset work?
DonT is offline   Reply With Quote
Old 01-02-18, 11:10 AM   #20
buffalobillpatrick
Master EcoRenovator
 
Join Date: Mar 2014
Location: Florissant, Colorado
Posts: 599
Thanks: 814
Thanked 59 Times in 55 Posts
Default

https://s3.amazonaws.com/s3.supplyho..._PROD_FILE.pdf

There are some details to study, basically outdoor reset makes the heating water hotter as the temperature outside goes lower.

4 dip switches set up temperature limits & a rotary sets the ratio.

In example, with outdoor reset ratio rotary set to 1.0
When the outdoor temperature drops by say 20* then the system water is increased by 20*

A well insulated house may use a .4 ratio & a poorly insulated house may need 1.4 ratio

You start with an educated guess & then fine tune by trial & error

buffalobillpatrick is offline   Reply With Quote
The Following 3 Users Say Thank You to buffalobillpatrick For This Useful Post:
DonT (01-02-18), jeff5may (01-02-18), where2 (01-02-18)
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 09:26 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Ad Management by RedTyger
Inactive Reminders By Icora Web Design