Question For Beenthere - HVAC - DIY Chatroom Home Improvement Forum

 DIY Chatroom Home Improvement Forum > HVAC Question for Beenthere
 Register Blogs Articles Rewards Search Today's Posts Mark Forums Read

06-05-2009, 09:10 AM   #1
Member

Join Date: Nov 2008
Posts: 299
Rewards Points: 292

## Question for Beenthere

Been:

On the 'talk' forum, you replied to 'low amp draw' and asked if the WB temps were taken for supply and return to calculate actual capacity.

Could you elaborate, please, how that is done using those values?

Thanks.

V

06-05-2009, 04:50 PM   #2

Join Date: Oct 2008
Location: Somewhere
Posts: 34,621
Rewards Points: 8,228

You convert wetbulb to enthapy(BTUs per pound of dry air).
Then multiply the enthapy difference by the CFM and by 4.5 to get total capacity.

EG:

Return, 76°DB 63° WB=28.477BTUs per pound dry air.
Supply, 56F DB 54°WB=22.602BTUs per pound dry air.

28.477-22.602=5.875 Enthapy Delta.
5.875Enthapy DeltaX4.5Seal Level Constant=26.437X1000CFM=26,437BTUs total capacity.

06-06-2009, 06:35 AM   #3
Member

Join Date: Nov 2008
Posts: 299
Rewards Points: 292

Quote:
 Originally Posted by beenthere You convert wetbulb to enthapy(BTUs per pound of dry air). Then multiply the enthapy difference by the CFM and by 4.5 to get total capacity. EG: Return, 76°DB 63° WB=28.477BTUs per pound dry air. Supply, 56F DB 54°WB=22.602BTUs per pound dry air. 28.477-22.602=5.875 Enthapy Delta. 5.875Enthapy DeltaX4.5Seal Level Constant=26.437X1000CFM=26,437BTUs total capacity.
Thanks, Been

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post KUIPORNG Remodeling 234 08-26-2008 08:19 AM indep HVAC 3 07-17-2008 10:39 PM rob7young Remodeling 2 04-13-2008 09:10 AM Onytay Electrical 1 10-24-2007 05:47 AM lh0628 HVAC 4 10-11-2007 10:17 PM

Top of Page | View New Posts