Results 1 to 8 of 8
Thread: fresh air heating in cold area
-
22-03-2006, 02:22 AM #1
fresh air heating in cold area
An HVAC issue
In cold area winter, fresh air need heating before go into AC space. It's easy to be frozen while using water heating coil. What's the best way for it? Electrical heating /heat pump heating /other ways?
Have you any experience in it shearing with me?
thanks
regards
LC
I hear...I forget;I see...I remember;I do...I understand
-
22-03-2006, 08:09 AM #2
Re: fresh air heating in cold area
If there's warm water in the coil, no problem with winter.
If otherways the heating may be off at any time, either install temperature-controlled louver and fan, or use antifreeze brine.
I would go for the first option, also because the minimum supply air temperature cannot be too low, and by closing louver and stopping fan you would avoid that.
I personally recommend indirect free cooling, with DX water cooled AC, and three way valve on the eg condenser water, so that the dry coolers would deliver condensing water in summer, and free cooling water in winter in a chilled water coil.
-
22-03-2006, 08:12 AM #3
Re: fresh air heating in cold area
No experience.
But still for small systems according to me electrical heating would be the simplest way.
-
22-03-2006, 04:19 PM #4
Re: fresh air heating in cold area
Hi,
For preheating of air you can you following options:
1. Electrical heaters can be used for heating the outside air. However the cost of electrical heating is very high.
Advantage of using electrical heaters is once u install it you have zero maintenance.
2. Hot water is also a good option, However you will have to provide hot water coil, valves and piping. Therefore this option has a higher initial cost but a lower running cost.
3. If boiler is available then u can consider the option of steam also.
RegardsVijay Kumar
HVAC Design Engineer
BMCPL
"The more you sweat in peace less you bleed in war"
-
22-03-2006, 06:49 PM #5
Re: fresh air heating in cold area
I'm sure there are air-to-air heat exchangers out there that pre-heat the in-coming air with the out-going air, I know Daikin do them. Supplemental heating would still be required though I would've thought in colder climates
Last edited by phil68; 22-03-2006 at 07:06 PM.
Noah had to leave the dinosaurs behind as they would've sunk the boat.
-
13-05-2009, 03:39 AM #6
Re: fresh air heating in cold area
Consider an air-to-air heat exchanger like Munters-Rotair, or Wingwheel, to maximise heat recovery from exhaust air, generally in the +23'C range. Or cycle exhaust fan on a time basis, driven by air analysis sampling system [co2 ]in supply air, ie reduce cold air introduction.
magoo
-
13-05-2009, 07:16 AM #7
Re: fresh air heating in cold area
I'm not sure the poster is interested in a three years old thread.
-
14-05-2009, 01:37 AM #8
Re: fresh air heating in cold area
It's still a topic, I think
I hear...I forget;I see...I remember;I do...I understand
Similar Threads
-
underfloor heating and cooling
By Lc_shi in forum New TechnologiesReplies: 19Last Post: 11-12-2009, 12:22 PM -
cold river water
By eftimios in forum FundamentalsReplies: 8Last Post: 09-11-2008, 06:37 PM -
expansion valve aint cold
By justinworne in forum Trouble ShootingReplies: 6Last Post: 26-07-2006, 10:52 PM -
Heating problem
By meadows in forum Trouble ShootingReplies: 7Last Post: 01-07-2006, 11:03 AM -
Large cold room for fresh produce made of Glass
By allanbaker in forum New TechnologiesReplies: 3Last Post: 11-05-2004, 09:04 PM