[Equest-users] New to eQuest modeling - Adding HVAC systems
DEldridge at grummanbutkus.com
Sat Mar 21 13:16:49 PDT 2020
If I’m understanding the situation there are 14 existing HVAC units that served three separate “suites” and now one occupant will control the whole building allowing sharing between the 14 HVAC units such that several may become redundant. The total capacity is about 100 tons.
In the new design you will have combined air distribution and expect the total load to be 60 tons, including air sealing. Hopefully a lighting upgrade as well which will help reduce the loads unless the system is already modernized.
Do you need to model the existing case? If the only decisions are the new system, then just model the building as it will be configured.
If the modeling is being used to support third-party financing then you may need to model the existing case and calibrate to utility bills. In that case you’ll have an envelope and spaces, and zones that will be the same in both cases, but you’ll be free to serve these from one set of HVAC in your baseline and new HVAC in the proposed case – focus on defining the zones so that you can change the scenario from baseline to proposed. My main tip would be to make more granular zones in case you aren’t sure which will be served by what combination of HVAC in the future. If you make larger zones in the baseline you may find it limiting in how to change it going forward. The smallest amount of zones may be 14 – one for each existing HVAC unit, but may be more if there are variations in use and occupancy within those system service areas and differences how you may combine them in the future. i.e. if you take one of the existing HVAC units and share its zones to two different new HVAC systems you’ll have to model that one as at least two zones in the baseline.
I hope this helps.
David S. Eldridge, Jr., P.E., BEMP, BEAP, HBDP, GGA
Direct: (847) 316-9224 | Mobile: (773) 490-5038
Grumman/Butkus Associates | 820 Davis Street, Suite 300 | Evanston, IL 60201
Energy Efficiency Consultants and Sustainable Design Engineers
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From: Equest-users <equest-users-bounces at lists.onebuilding.org> On Behalf Of Mark Stout via Equest-users
Sent: Saturday, March 21, 2020 2:14 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] New to eQuest modeling - Adding HVAC systems
I'm using eQuest to model the energy use of a 40,000 ft² commercial building that was once three separate internal spaces inside the same building. Over the years they consolidated into one building internally. however the HVAC systems have been designed for each of the three spaces prior to consolidation. They now want to add solar and I've been asked to model the current energy use and recommend upgrades to reduce their energy use before they size the solar. My goal is to redesign the entire air distribution system and upgrade a subset of DX systems and eliminate the others. They are getting a new roof and I believe that will help air seal the building reducing the stack effect such that then BTUs needed to heat and cool the space will be reduced and their existing 14 units of varying sizes totalling 100 tons of cooling can be reduced to maybe 60 tons. How do I model the 14 units? As one HVAC system of 100 tons assigned to zones or individual systems assigned to zones?
Mark Stout, President
HERS I & II, BPI BA, MFBA, RESNET HERS
Lighting & Mechanical Acceptance Testing
CALGreen Inspector/Plans Examiner
Apollo Energies, Inc.
888-614-8338 x101 Office
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