×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

What temperature to use for cooling degree day?

What temperature to use for cooling degree day?

What temperature to use for cooling degree day?

(OP)
What is a realistic temperature to use for CCD? I will be using the hours in conjunction with SEER to estimate future cost for KW-HR for a heat pump. Also how many years back should be included, ie 2012,2011 ,etc?

Thanks

RE: What temperature to use for cooling degree day?

Get yourself a TMY (typical meteorological year) weather file for your location, free from US DOE at: http://doe2.com/index_wth.html The TMY is a good statistical average, and it's the standard for energy analysis work.

Here's a discussion that's pretty accurate: http://en.wikipedia.org/wiki/Typical_meteorologica...

There are lots of conversion programs to turn that TMY file into readable data. This one from the U of Wisconsin Solar Energy Labs puts the TMY directly into Excel:

http://sel.me.wisc.edu/trnsys/weather/tmy2data.htm

As for your base temperature, the typical one we pick is 65°F for residential low-rise buildings, 50°-55°F for commercial and institutional spaces (except health care occupancies). Degree days is pretty meaningless for hospitals or any other facility that is heavily internally loaded.

Best to you,

Goober Dave

Haven't see the forum policies? Do so now: Forum Policies

RE: What temperature to use for cooling degree day?

I don't see how cooling degreeday and SEER will help.
First, for cooling you also would need wetbulb degree days and solar radiation. Second, your building, internal loads etc. play a role.
a 8760-hour energy simulation is a must to even have a chance, and event hat is based on many assumptions.

RE: What temperature to use for cooling degree day?

(OP)
Sorry, I will use CDD for summer kw-hrs.
CDD*24 = hours.
DesignTons*hours /SEER =kw-hr
Regards

RE: What temperature to use for cooling degree day?

Use TMY and an hourly building occupancy and use schedule.

Degree days are just too course to return anything meaninful.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources