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 05-24-2010, 03:59 PM   #1
Wire Chewer
 
Red Squirrel's Avatar
 
Join Date: Jun 2009
Location: Ontario, Canada
Posts: 3,200
Share |
Default

DIY central air with water, would it work?


It's been very hot lately and I've been thinking of ways to keep cool. I don't have AC and can't afford it at this point, though I might buy one of those portable units and rig something up so I can make it exhaust through my window (crank window).

I saw some videos where people have been successfull in passing cold water in a copper coil with a fan blowing over it. The thing with that is you need to generate said cold water or ice, and generating this creates heat. So while the principal works, it is generating heat elsewhere in the house (ex: the freezer). I was thinking of bringing this a step ahead, and getting one of those small freezers that open from the top, and adding a water coil in there, and a coil inside the furnace return with condensate drain pan. The freezer would be put outside the house, and the two lines would pass through the wall like the AC coil lines would.

Basically it would work exactly like a central air system but instead of the freon lines going in the house and furnace, it's chilled water. This is a very basic explanation of what I'm thinking of, there's lot of safety and other aspects I have though of already. Think this would work? Could a typical freezer actually keep up with this or would I burn it out?

Red Squirrel is offline   Reply With Quote
Old 05-24-2010, 04:06 PM   #2
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 9,008
Default

DIY central air with water, would it work?


Nyet. Sounds like a Red Green project. LOL. You would need a freezer with a compressor of at least 8-10,000 BTU/hr or more and would lose some cooling thru the pipes etc. Check the BTU rating of window shakers at Rona. I have seen a guy try use well water and a pump but the whole coil sweats like crazy and cannnot get cold enough to dehumidify your house so you get cold clammy air. The average AC coil is running 34-40 deg and indirect systems never can match that.

__________________
"Cut it twice and it is still too short".
yuri is offline   Reply With Quote
Old 05-24-2010, 04:10 PM   #3
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Default

DIY central air with water, would it work?


Quote:
Originally Posted by Red Squirrel View Post
I saw some videos where people have been successfull in passing cold water in a copper coil with a fan blowing over it.
Decades ago a guy put an auto radiator in his ductwork and circulated well water through it. He claimed it worked, but nobody believed him.

In view of post #2, he might have lucked out in his particular climate.
Yoyizit is offline   Reply With Quote
Old 05-24-2010, 04:13 PM   #4
Wire Chewer
 
Red Squirrel's Avatar
 
Join Date: Jun 2009
Location: Ontario, Canada
Posts: 3,200
Default

DIY central air with water, would it work?


Yeah was thinking that, I am adding an extra step in the whole process so I'd never be able to get the line cold enough without lot of loss.

I was also thinking of using some kind of coolent instead of water, then put blocks of dry ice in the freezer, but that would last what, a few hours? lol.
Red Squirrel is offline   Reply With Quote
Old 05-24-2010, 04:19 PM   #5
Military Mom of 4
 
Snav's Avatar
 
Join Date: Aug 2009
Location: Arkansas
Posts: 974
Default

DIY central air with water, would it work?


Quote:
Originally Posted by Red Squirrel View Post
It's been very hot lately and I've been thinking of ways to keep cool. I don't have AC and can't afford it at this point, though I might buy one of those portable units and rig something up so I can make it exhaust through my window (crank window).

I saw some videos where people have been successfull in passing cold water in a copper coil with a fan blowing over it. The thing with that is you need to generate said cold water or ice, and generating this creates heat. So while the principal works, it is generating heat elsewhere in the house (ex: the freezer). I was thinking of bringing this a step ahead, and getting one of those small freezers that open from the top, and adding a water coil in there, and a coil inside the furnace return with condensate drain pan. The freezer would be put outside the house, and the two lines would pass through the wall like the AC coil lines would.

Basically it would work exactly like a central air system but instead of the freon lines going in the house and furnace, it's chilled water. This is a very basic explanation of what I'm thinking of, there's lot of safety and other aspects I have though of already. Think this would work? Could a typical freezer actually keep up with this or would I burn it out?
I'm planning on getting a small window unit (cost $80.00) and constructing a cold-box that it will sit in and run with an access door and exit-tubes for channeling the cold air through to other rooms in the house.

I don't have central heat/air at all - and it's already 90 in the house on average, now, and the 100's aren't even here yet.
__________________
At this present moment in time I am making cabinets for the kitchen - just in case you wanted to know what I'm doing when I'm not around.
Snav is offline   Reply With Quote
Old 05-24-2010, 04:24 PM   #6
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Default

DIY central air with water, would it work?


Quote:
Originally Posted by Snav View Post
I'm planning on getting a small window unit (cost $80.00) and constructing a cold-box that it will sit in and run with an access door and exit-tubes for channeling the cold air through to other rooms in the house.
You'll probably need one rated for industrial or commercial use. Otherwise it will die soon.
Yoyizit is offline   Reply With Quote
Old 05-24-2010, 04:27 PM   #7
Military Mom of 4
 
Snav's Avatar
 
Join Date: Aug 2009
Location: Arkansas
Posts: 974
Default

DIY central air with water, would it work?


Quote:
Originally Posted by Yoyizit View Post
You'll probably need one rated for industrial or commercial use. Otherwise it will die soon.
Well, by the circulation being enclosed it wouldn't have to run constantly. Most types are programmable and can be set to monitor the surrounding air temperature and cycle to maintain it.

Might not be the pretties thing in the house But I'll build it - if anything, I might have to just get a larger unit but I think the small one will work fine.
__________________
At this present moment in time I am making cabinets for the kitchen - just in case you wanted to know what I'm doing when I'm not around.
Snav is offline   Reply With Quote
Old 05-24-2010, 04:28 PM   #8
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 24,509
Default

DIY central air with water, would it work?


You would need to put the coil in the furnaces air discharge. Or you would ruin the furnace if you put it in the return.

As Yuri said, it would take a large capacity freezer. But, there is hope there.

You could use it like an off peak system. You would run the freezer when you weren't cooling the house, and freeze the water in it. Then circulate a solution of antifreeze and water through the coil/pipes you had in the freezer. Your coil in the furnace would drop to a low enough temp that it would dehumidify, and cool your house. You would need a flow regulator, since as the ice melted, and you just had cold water in the freezer, you would need to move more water through the coil.

An 18 cubic foot freezer. Would need to have a large BTU capacity. It would take 21,592 BTUs to turn 18 CF of water from 32 water to 32 ice. So Yuri's BTU estimate is about right. if you let the freezer run when ever it needs to keep the ice frozen.

The cost of the freezer, coil, pump and other controls, won't be all that cheap though.
beenthere is offline   Reply With Quote
Old 05-24-2010, 04:30 PM   #9
Wire Chewer
 
Red Squirrel's Avatar
 
Join Date: Jun 2009
Location: Ontario, Canada
Posts: 3,200
Default

DIY central air with water, would it work?


Actually I was wondering that too, put a window unit in my basement window, and channel the air through the return duct. Maybe more effective then my original idea?
Red Squirrel is offline   Reply With Quote
Old 05-24-2010, 04:33 PM   #10
Wire Chewer
 
Red Squirrel's Avatar
 
Join Date: Jun 2009
Location: Ontario, Canada
Posts: 3,200
Default

DIY central air with water, would it work?


Quote:
Originally Posted by beenthere View Post
You would need to put the coil in the furnaces air discharge. Or you would ruin the furnace if you put it in the return.

As Yuri said, it would take a large capacity freezer. But, there is hope there.

You could use it like an off peak system. You would run the freezer when you weren't cooling the house, and freeze the water in it. Then circulate a solution of antifreeze and water through the coil/pipes you had in the freezer. Your coil in the furnace would drop to a low enough temp that it would dehumidify, and cool your house. You would need a flow regulator, since as the ice melted, and you just had cold water in the freezer, you would need to move more water through the coil.

An 18 cubic foot freezer. Would need to have a large BTU capacity. It would take 21,592 BTUs to turn 18 CF of water from 32 water to 32 ice. So Yuri's BTU estimate is about right. if you let the freezer run when ever it needs to keep the ice frozen.

The cost of the freezer, coil, pump and other controls, won't be all that cheap though.
So putting it in the return would not be good? Is it because it's blocking too much air from going in? I could put it in the plenum, I'd just have to make sure it works right the first time, with no leaks or it would not be pretty. And yeah this may end up costing a lot to the point where it's not worth it, and may as well spend a bit more on a real system. I'd have to price all the parts I'd need and go from there.
Red Squirrel is offline   Reply With Quote
Old 05-24-2010, 04:34 PM   #11
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 24,509
Default

DIY central air with water, would it work?


Quote:
Originally Posted by Red Squirrel View Post
Actually I was wondering that too, put a window unit in my basement window, and channel the air through the return duct. Maybe more effective then my original idea?
Or it may not be able to move enough air through the tubes, and then freezes up.
beenthere is offline   Reply With Quote
Old 05-24-2010, 04:35 PM   #12
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 24,509
Default

DIY central air with water, would it work?


Putting it in the return. Cause the cold air to blow over the heat exchanger. And cause condensation inside the heat exchanger. And rust it out.
beenthere is offline   Reply With Quote
Old 05-24-2010, 04:39 PM   #13
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 9,008
Default

DIY central air with water, would it work?


Sears Super Saturday or spend your Cdn Tire $$ on a window shaker. (I love/hate that name as I lived in apartments too long with them).
__________________
"Cut it twice and it is still too short".
yuri is offline   Reply With Quote
Old 05-24-2010, 07:03 PM   #14
Wire Chewer
 
Red Squirrel's Avatar
 
Join Date: Jun 2009
Location: Ontario, Canada
Posts: 3,200
Default

DIY central air with water, would it work?


Quote:
Originally Posted by beenthere View Post
Putting it in the return. Cause the cold air to blow over the heat exchanger. And cause condensation inside the heat exchanger. And rust it out.
Ah right that makes sense, so best to put it above the heat exchanger along with a method to catch the condensate and drain it.
Red Squirrel is offline   Reply With Quote
Old 05-24-2010, 07:08 PM   #15
Member
 
Join Date: Nov 2009
Location: central virginia mountains
Posts: 1,857
Default

DIY central air with water, would it work?


google Swamp Coolers, they use in mid west. not sure if climate needs to be arrid

__________________
The older I get the better I was
tpolk 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
Well Water snuggles2010 Plumbing 3 04-13-2010 01:36 PM
Venting Water Heater near Central Air Unit rchrivera Plumbing 5 03-16-2010 11:03 PM
Preference for installing tub spout? dolvio Plumbing 7 02-11-2009 10:53 PM
Filling a Cast Iron radiator system insulatorpro HVAC 7 10-06-2008 11:31 PM
(Water Heater MYSTERY) Hot water out from dead tank with cold water in it? Inayity Plumbing 6 07-14-2008 08:36 PM




Top of Page | View New Posts

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