Any HVAC experts?

Old Feb 23rd 2012, 4:16 am
  #1  
BE Forum Addict
Thread Starter
 
Oyibopeppeh's Avatar
 
Joined: Jun 2010
Location: UK
Posts: 1,308
Oyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond repute
Default Any HVAC experts?

Is there a formula for calculating the air conditioning power required to cool an interior space?

I have a building located in a terrace, 13.5m x 3.7m x 7.5m high with an uninsulated roof. Would 3 x 2hp split AC units be enough?
Oyibopeppeh is offline  
Old Feb 23rd 2012, 5:10 am
  #2  
BE Enthusiast
 
csdf's Avatar
 
Joined: Jun 2010
Location: Abu Dhabi
Posts: 794
csdf has a reputation beyond reputecsdf has a reputation beyond reputecsdf has a reputation beyond reputecsdf has a reputation beyond reputecsdf has a reputation beyond reputecsdf has a reputation beyond reputecsdf has a reputation beyond reputecsdf has a reputation beyond reputecsdf has a reputation beyond reputecsdf has a reputation beyond reputecsdf has a reputation beyond repute
Default Re: Any HVAC experts?

It's simple, you just need to account for cooling loss through conduction through the walls, roof and floors, cooling loss through doors and windows, heat gain from bulbs, appliances and human inhabitants, solar load through windows, heat capacity of the air and building envelope and output of your HVAC unit.
csdf is offline  
Old Feb 23rd 2012, 5:17 am
  #3  
WWLLCJD?
 
Scamp's Avatar
 
Joined: Feb 2011
Location: Dubai
Posts: 21,454
Scamp has a reputation beyond reputeScamp has a reputation beyond reputeScamp has a reputation beyond reputeScamp has a reputation beyond reputeScamp has a reputation beyond reputeScamp has a reputation beyond reputeScamp has a reputation beyond reputeScamp has a reputation beyond reputeScamp has a reputation beyond reputeScamp has a reputation beyond reputeScamp has a reputation beyond repute
Default Re: Any HVAC experts?

Originally Posted by csdf View Post
It's simple, you just need to account for cooling loss through conduction through the walls, roof and floors, cooling loss through doors and windows, heat gain from bulbs, appliances and human inhabitants, solar load through windows, heat capacity of the air and building envelope and output of your HVAC unit.
Yeah...piece of piss.
Scamp is offline  
Old Feb 23rd 2012, 6:00 am
  #4  
Knee deep and rising
 
weasel decentral's Avatar
 
Joined: Sep 2011
Posts: 2,788
weasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond repute
Default Re: Any HVAC experts?

http://easycalculation.com/weather/ac.php..will give you an idea (basic)

then check the output of the AC unit, the answer is given in BTUs (thermal units) and you can just check versus the rating on the AC unit you have. (never mind the HP figure you quoted, use the AC output rating)

edit to say, looking at your height of roof multiply your answer by 2.5 (as this will only be for a normal height room)

Last edited by weasel decentral; Feb 23rd 2012 at 6:03 am.
weasel decentral is offline  
Old Feb 23rd 2012, 2:26 pm
  #5  
BE Forum Addict
Thread Starter
 
Oyibopeppeh's Avatar
 
Joined: Jun 2010
Location: UK
Posts: 1,308
Oyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond reputeOyibopeppeh has a reputation beyond repute
Default Re: Any HVAC experts?

Originally Posted by csdf View Post
It's simple, you just need to account for cooling loss through conduction through the walls, roof and floors, cooling loss through doors and windows, heat gain from bulbs, appliances and human inhabitants, solar load through windows, heat capacity of the air and building envelope and output of your HVAC unit.

Yeah right Einstein, that's why I asked if there was a formula!
Oyibopeppeh is offline  
Old Feb 23rd 2012, 3:28 pm
  #6  
BE Forum Addict
 
Tockalosh's Avatar
 
Joined: Jan 2009
Location: Up on the Ranches not down on the Springs
Posts: 2,105
Tockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond repute
Default Re: Any HVAC experts?

Originally Posted by weasel decentral View Post
http://easycalculation.com/weather/ac.php..will give you an idea (basic)

then check the output of the AC unit, the answer is given in BTUs (thermal units) and you can just check versus the rating on the AC unit you have. (never mind the HP figure you quoted, use the AC output rating)

edit to say, looking at your height of roof multiply your answer by 2.5 (as this will only be for a normal height room)
Just add they are British Thermal Units young Weasal Decentral. So often find our free state brothers forget to use the British bit first
Tockalosh is offline  
Old Feb 23rd 2012, 7:03 pm
  #7  
Knee deep and rising
 
weasel decentral's Avatar
 
Joined: Sep 2011
Posts: 2,788
weasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond reputeweasel decentral has a reputation beyond repute
Default Re: Any HVAC experts?

Originally Posted by Tockalosh View Post
Just add they are British Thermal Units young Weasal Decentral. So often find our free state brothers forget to use the British bit first
I hum God save the queen to myself every time I do a calculation involving British thermal units.
We started calling it the Republic of Ireland quite recently
weasel decentral is offline  
Old Feb 24th 2012, 3:31 am
  #8  
BE Forum Addict
 
Tockalosh's Avatar
 
Joined: Jan 2009
Location: Up on the Ranches not down on the Springs
Posts: 2,105
Tockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond reputeTockalosh has a reputation beyond repute
Default Re: Any HVAC experts?

Originally Posted by weasel decentral View Post
I hum God save the queen to myself every time I do a calculation involving British thermal units.
We started calling it the Republic of Ireland quite recently
Tockalosh is offline  

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


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.