Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-13-2012, 04:02 PM   #1
Newbie
 
Join Date: Jan 2012
Posts: 13
Rewards Points: 10
Default

building an refrigeration unit


Hello everyone,

I'm new to this site, though I'm as much of a diy'er when I can be. I need some HVAC advice. I want to build a propyelene glycol chilling system. I've heard of people just using a window a/c unit, and putting the evap coils into the glycol tank, but the casing on the coil unit starts to rust and then clogs the glycol pump. I'd also just like to build one that's larger than you could do with a window unit.

My question is, where could I find enough information to build a unit from scratch? I understand the basic refrigeration cycle and have have an idea of what parts I'd need, I just know nothing about part compatibility or the size/length of coils I'd need on each side. Where can I get enough information to do this? I'd like to build between a 6K and 10K btu system, btw.

Thanks for any and all help!

rtockstein is offline   Reply With Quote
Old 01-13-2012, 04:55 PM   #2
MarginallyQualified
 
Join Date: Dec 2011
Location: Winston-Salem NC
Posts: 3,681
Rewards Points: 2,036
Default

building an refrigeration unit


Quote:
Originally Posted by rtockstein View Post
...but the casing on the coil unit starts to rust and then clogs the glycol pump.
You'll probably need to make your own coil...
using something (stainless? aluminum?) that doesn't react to the chemicals.

Quote:
My question is, where could I find enough information..
I just know nothing about part compatibility...
start with an Aireco catalogue
http://www.aireco.com/


Last edited by TarheelTerp; 01-13-2012 at 05:18 PM.
TarheelTerp is offline   Reply With Quote
Old 02-10-2012, 07:27 AM   #3
Newbie
 
Join Date: Jan 2012
Posts: 13
Rewards Points: 10
Default

building an refrigeration unit


Quote:
Originally Posted by TarheelTerp View Post
You'll probably need to make your own coil...
using something (stainless? aluminum?) that doesn't react to the chemicals.

start with an Aireco catalogue
http://www.aireco.com/
Yea, if I were to build a unit from scratch, I'd be building my own coil. The problem is I wouldn't know how to figure out what length and diameter of tube I'd need.

I'd just use copper though, since copper oxidation isn't flaky and awful like the rust is that would be coming off the galvanized casing (or whatever it's made of).

I found out that I'd need a 1 to 1.5 HP compressor, which equates to being able to handle a 5500 to about 7500 BTU load. Anyone know where I can find out how to build one to those specs?
rtockstein is offline   Reply With Quote
Old 02-10-2012, 07:21 PM   #4
MarginallyQualified
 
Join Date: Dec 2011
Location: Winston-Salem NC
Posts: 3,681
Rewards Points: 2,036
Default

building an refrigeration unit


Quote:
Originally Posted by rtockstein View Post
I found out that I'd need a 1 to 1.5 HP compressor...
Based on what?

Quote:
The problem is I wouldn't know how to figure out what length and diameter of tube I'd need.
It's usually a function of "exposure" (how many square inches of surface per linear foot) relative to the space available.

When I was doing custom S/S fab we built refrigerators and freezers and frost over display things for buffet lines using either standard ACR copper tubing bent by hand or copper pipe with 180' U bends at each end.

hth
TarheelTerp is offline   Reply With Quote
Old 02-10-2012, 08:04 PM   #5
Member
 
Join Date: May 2011
Location: Massachusetts, USA
Posts: 325
Rewards Points: 250
Default

building an refrigeration unit


Just use a window AC unit - you can get those in 10k and larger sizes. Pull out the finned evaporator coil and replace it with either stainless or copper loops, using the same diameter lines. If you are immersing this coil in liquid glycol heat exchange shouldn't be an issue.

I would try to estimate how long the primary evaporator line is (without the fins) and use that to size your new coil. Then just stick the thermostat in the glycol, set the temp and let er' rip. Just make sure the glycol is circulating well.
Thunder Chicken is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
What is the price difference between a 2.5 ton unit and a 3 ton unit? Leoskee HVAC 5 06-12-2014 12:00 PM
Ruud Pack unit "KABOOMS" upon First Light Up of the Day! Wirenut2tite HVAC 18 12-15-2012 10:11 AM
What Temps Should York AC Unit Be? - Is it Me or Does my AC kind of work? mrpman HVAC 7 07-24-2011 06:59 PM
Carrier Condenser Unit Screwed? gimmes name HVAC 6 07-24-2011 07:05 AM
Replacing a condensing unit with a higher SEER rating unit tylanz HVAC 3 06-28-2010 04:44 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.