SEER vs EER energy simulation
SEER vs EER energy simulation
(OP)
I am working on an energy simulation as per 90.1-2004 appendix G for a LEEDS project. I am having issues with SEER vs. ERR of unitary packages less than 65K btu/hr. 90.1 requires a SEER of 12.0 but the modeling software uses EER. Units larger then 65K are tested to a different ARI test standard and are rated in EER . Units less than 65K are tested at 85 degrees and larger units are tested at 95 degrees. What EER value have others used for the baseline EER on units less than 65K btu/hr?





RE: SEER vs EER energy simulation
You have a couple of choices:
1)Contact the manufacturer for the EER rating which they probably know even if they do not publish it.
2) Estimate the EER using the compressor manufacturer's data (this is relatively easy if it is a Copeland compressor since they have all of their compressor data available in sizing software) and the existing SEER number. See the thread http://www
Which simulation software are you using?
RE: SEER vs EER energy simulation
"B" test - cooling steady state - this is run at 80 db 67 wb and 82 db condenser air.
"C" test - steady state dry coil test - this is run at 80 db 57 wb and 82 db condenser air.
"D" test - Cycling dry coil test - this is run at 80 db 57 wb and 82 db condenser air - unit is cycled off and the degradation in cooling energy is measured.
SEER is then calculated as: SEER = PLF(0.5) * EER "B" test
PLF(0.5) = 1 - 0.5 * CD CD is derived from the "C" and "D" tests.
The default is a CD of 0.25
This results in an EER of 13.71 on a SEER 12. This seems wrong due to the EER exceeds the SEER
I find it very odd that we use EER at 95 degrees on larger unit and 82 degrees on small unit in the same model.
RE: SEER vs EER energy simulation
I think that there is some problem with the formula that you gave. Of the formula is PLF(0.5) = 1 - [0.5 * CD] then PLF(.5) would have to be greater than unity (one) for the SEER to be greater than the EER. This means that CD would have to be a negative number. Either that or the EER "B" is not the EER that is referred to in the modeling software (again very possible). Without spending a huge amount of time researching this I will direct you to a statement that I found at the following link:
http://www.aceee.org/pubs/a042_h2.pdf
"For baseline residential units we use a SEER12/EER 10 unit".
RE: SEER vs EER energy simulation
RE: SEER vs EER energy simulation
If you are interested in eQUEST you can download it for free at http://www.doe2.com/equest/ courtesy of California electric utility ratepayers.