What should the split temps be inside and outside?

Reply

  #1  
Old 10-13-12, 09:08 AM
Member
Thread Starter
Join Date: Aug 2012
Posts: 28
What should the split temps be inside and outside?

I realize it may vary and the larger the split the better, but is there a ballpark figure minimum for the desired split difference for the inside and outside? Are they suppose to match almost?

Thank you.
 
Sponsored Links
  #2  
Old 10-14-12, 06:50 AM
hvactechfw's Avatar
Member
Join Date: Jan 2011
Posts: 6,245
split between supply and return inside should be 15-20F
 
  #3  
Old 10-19-12, 05:48 AM
HVAC RETIRED's Avatar
Member
Join Date: May 2008
Location: Wisconsin USA
Posts: 715
You size cooling equipment by the split between outdoor & indoor temps & the indoor humidity load & the summer design for your climate area.

Additionally, a room by room heat-gain calc needs to be performed to determine equipment & duct system design & sizing.

The indoor design target is normally 75-F & 50% or less relative humidity; the outdoor design temp will determine the sensible split; 90-F outdoors 75-F indoors is a 15-F sensible split, etc.

At 50% relative humidity, with tight ductwork, the indoor split at an airflow 400-CFM should normally be 19 to 21-F; higher humidity levels will result in lower indoor SA/RA temp-splits & higher condenser temp-splits compared to outdoor temps.
 
Reply

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


Thread Tools
Search this Thread
Display Modes