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
Thanks





RE: What temperature to use for cooling degree day?
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
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RE: What temperature to use for cooling degree day?
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?
CDD*24 = hours.
DesignTons*hours /SEER =kw-hr
Regards
RE: What temperature to use for cooling degree day?
Degree days are just too course to return anything meaninful.