[Equest-users] Appendix G Baseline Systems 1 and 2 efficiency

[Jeremy Poling]

Have you thought about using a "user input function" to define the EIR?  I haven't used one this way yet, but there are a few examples out there in the help info.  In theory, you could setup a logic statement that checks the capacity and uses the EIR value appropriate for that size system.  I'd be willing to discuss the idea with you guys, but there'll be a certain amount of "if at first you don't succeed..." involved to figure out the right code to grab the system capacity.
 
I've been playing more with user input functions after seeing some examples of powerful ways they can remove some of the repetitive changes.  For example, for single-zone systems, you could theoretically program eQuest to auto-calculate the OA based on ASHRAE 62.1 requirements and the zone area and population.  You could probably do it for multi-zone systems also, but that gets into the complexity level of the ASHRAE 62.1 spreadsheet and it is probably less time to just do the calcs in the spreadsheet and input the results.
 
Jeremy R. Poling, PE, LEED AP+BDC


________________________________

From: equest-users-bounces at lists.onebuilding.org on behalf of Dahlstrom, Aaron
Sent: Tue 5/17/2011 10:31 PM
To: Bishop, Bill; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Appendix G Baseline Systems 1 and 2 efficiency



Bill:

 

Your procedure sounds very similar to ours.

 

Beyond the simple automation of a spreadsheet, and dual monitors to copy data from SIM to XLS quickly, we haven't found any quicker ways to skin this cat.

 

Aaron Dahlstrom , PE, LEED® AP

In Posse - A subsidiary of AKF| 1500 Walnut Street, Suite 1414, Philadelphia, PA 19102 

d: 215-282-6753| m: 267-507-5470| In Posse: 215-282-6800| AKF: 215-735-7290

e: ADahlstrom at in-posse.com | in posse web: www.in-posse.com <http://www.in-posse.com/>  | akf web: www.akfgroup.com <http://www.akfgroup.com/> 

 

 

 

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bishop, Bill
Sent: Tuesday, May 17, 2011 3:43 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Appendix G Baseline Systems 1 and 2 efficiency

 

Appendix G Baseline Systems 1 (PTAC) and 2 (PTHP) have cooling efficiencies (and for PTHP, heating efficiencies) that vary with cooling capacity per Table 6.8.1D. Since each thermal block is modeled with its own system, you can end up modeling as many as 100 or more systems per project. For LEED projects (or other App. G models), I have been calculating and manually entering values for cooling EIR for every single system, based on capacities reported in the SV-A reports. I factor in the unique fan power (per G3.1.2.9) for each system and remove its contribution from the efficiency, since fan power is included in EER and needs to be separated per G3.1.2.1. Once you enter efficiency for each system, just about any change you make in the model changes the supply flow rate and/or system capacities, which means you need to redo all the efficiency calculations.

 

Does this method seem correct?

Has anyone figured out a way to automate this process? (And by "automate", I don't mean give it to the intern.)

 

Thanks,

Bill

 

 

 


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