Hello,
I am modeling a Winery, where most of the chillers and boilers are used for process tasks.
I am using HAP to model this building, and I have this questions regarding the best way to model these chillers and boilers, because as I understand they are process loads:
1. In the first place we are using heat pump chillers, that generate chilled and hot water at the same time. These chillers are much more efficient than those indicated in ASHRAE 90.1-2007. So I believe that we may take advantage of this situation in determining the energy savings between the process load of the proposed building and the baseline building. Is this right?
2. If I take these chillers as regular chillers in the software this energy efficiency will be reflected in the final calculations, but they are not going to be taken as “Process Loads”.
3. An alternative that I consider is to model each of these chillers independently, with the actual data for the proposed building and the chiller an boiler indicated in Appendix G. And then manually calculate Process Loads and savings. This way we may reflect energy savings and Process Loads percentage.
I will appreciate any comments or recommendations on this issue,
Thank you,
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5861 thumbs up
August 1, 2017 - 10:42 am
1. Usually the baseline for a process chiller would be the minimum efficiency of the same type of chiller in 90.1. I don't think heat pump chillers are in 90.1-2007. You might want to check future versions to see if they were added. If so use that minimum for the baseline. if not then you will need to provide some sort of additional justification for the selection of your baseline.
2. There should be a way to separate this energy use as a process load within the software.
3. Post-processing the modeled data could certainly be possible. Make sure to explain the calculations and assumptions.
Usually the biggest issue with process load savings is the justification of the baseline. Don't just assume a baseline. It must be justified as standard industry practice for a similar facility in your location.
Paula Hernandez
MRS.MPH&H
84 thumbs up
August 1, 2017 - 11:11 am
Hi Marcus, this has been very helpful, I will check in later editions of the standard to see if heat pump chillers already exist,
thank you,