Greg Collins's profile - activity

PV / Battery Storage Algorithms, Open-source software, Python I'm trying to understand what's out there and available re

I tried replying but apparently spam was detected in my post... If it's a NEW plant serving NEW buildings, I'd suggest m

Reviving an old thread to provide and then request some further clarification on this.. I believe the "correct" climate

This may be a controversial suggestion, but here it is.. Your design is perfectly valid, but there is a limitation of th

I'm not positive this is your issue, but I'd suggest specifying UTF-16 as the codec. That seems to be the default encodi

I know that CBECC-Com and CBECC-Res both use the CSE engine's DHW system calculations for residential space types. I am trying to figure out how the calculation works for multi-family projects, so I can better compare these assumptions to those in the design.

Ideally, I'd like to understand the calculations so I can replicate the peak demand flow rate and hourly (sub-hourly?) schedules. I would settle for being able to extract this info from a T24 compliance simulation after running in CBECC-Com.

I have read Appendix B in the Residential ACM, "Water Heating Calculation Method". It seems to explain how the calculation works, but I just can't make sense of it. I've also reviewed the relevant publications referenced in Appendix F.

I have scoured the files and subdirectories after running a CBECC-Com simulation. I haven't found any files that show the relevant input or results info to/from the CSE engine to give me what I want.

The DHWDU.txt looks to include the hot water draw profiles used for single and multi-family dwelling units, but I haven't been able to reverse-engineer the profiles to make sense of them.

Does somebody out there have a reference you can share or an explanation for building up draw profiles from the DHWDU.txt file? Thanks in advance.

I am looking for a good way to automatically backup my modeling files on an ongoing or daily basis. Since it is typically best practice to save modeling files to the C drive instead of a server (or server-like backup utility like we use), manual copy-to-server type backups tend not to work as consistently..

Ideally, what I'm looking for is a backup utility that will automatically copy over the folder structure along with the files inside with the .cab extension. The utility would copy these files/folder either to another folder on my C drive that I can have backed up by my current utility OR it could backup directly to the cloud.

We have a strong preference to IGNORE the results files which are huge and can be easily reproduced. Most backup utilities I've seen have the ability to EXCLUDE specific file extensions.. However, I'd like to only INCLUDE specific extensions (eg .cab as mentioned before for IES-VE projects, or .cibd16(x) for CBECC-Com files, etc.)

Thanks for sharing any backup methods that are working for you.

If your project has window overhangs, you should model them. If you don't model them, you won't get any energy savings t

I'd suggest reaching out to support@iesve.com for software-specific errors like this. It's very hard to troubleshoot tha

To add to Aaron's advice.. EnergyPro will generate the .cibd19x (or similar) file in Documents > EnergyPro 8 > [

We're working on a script and want to accept a single-line of text from a user. For example.. proj_name = [insert code] # user to enter project name

Ideally, I'd like this to be in a new navigator just for the script, but a mini gui (using tkinter) could also work.

There are a bunch of example scripts that install with VE that are helpful, but none I've found show how to take text from a user prompt. I'm hoping somebody here can provide an example of how to do this from within VE.

edit: There is a great 4-part series of articles from Timothy Moore at IES on resolving unmet load hours: https://www.

I'll keep an eye out for your answer. Thanks for replying back to this though. This post was a while ago and we've done

Why would you NOT want to use VistaPro for something like this? And what do you want the individual chiller loads to be

Thanks @shorowit for these links. The second one has the equations and explanation to make use of the curve coefficients

We're working on a CBECC-Com model for a high-rise res project that's using WSHP's. The engineer has specified high-efficiency units with variable speed compressors. However, the energy performance is lousy compared to the chilled water baseline. We experimented with swapping the WSHP to ASHP, and the performance shot up significantly. This is probably a bad idea (i.e. I'll know exactly where the brick wall is but can't go through it), but I am trying to reverse-engineer the modeling of the WSHP to see how the COP is affected at different part-load and CDW loop temp conditions.

I've reviewed a prior version of the T24 Appendix 5.7 spreadsheet with performance curves. That's been helpful in the past, but I couldn't find any E+ curves that seemed to match what's being modeled.

Here's a snippet from the IDF defining the cooling coil and with curve fit data: (I tried pasting directly, but the code formatting blew up, sorry)

I see the three types of curve coefficients, and I understand how the curves work, but how do I know whether these are quadratic, biquadratic, cubic, etc.? I'd like to set them up in a spreadsheet to adjust input parameters and see what happens. Can somebody walk me through how to do that, or provide a reference that does?

I have also reviewed the E+ doc here, but didn't find an explanation of the relevant curves: link text I assume that documentation is not the exact right fit because it describes many more variable speed functions that I see in the CBECC-Com GUI or IDF file.. I'm guessing this is why we'll be stuck cranking up the rated EER since we can't account for the better turn-down, etc. of the selected units..

How's it work?: Coil:Cooling:WaterToAirHeatPump:EquationFit We're working on a CBECC-Com model for a high-rise res proje

Aaand you face the "problem" with IES-VE that it is confuses people by aligning with real-life. Most people have the eQU

This is going to be the long way to get there, but it seems like it would benefit you.. If it were me, I'd download and

Residential DHW Flow Rates in CA Software I know that CBECC-Com and CBECC-Res both use the CSE engine's DHW system calcu

Thanks @ericmartinpe for the link to the 2019 schedules

I'm not sure how important T24-2016 vs 2019 templates are to the OP.. What Eric linked to is the 2016 App5.4 docs.. It t

IES-VE Python API / Use navigator or gui to enter data We're working on a script and want to accept a single-line of tex

Thanks, David. I did think of Standard 209 after submitting this. I have a copy and am familiar -- it is a little too ge

Level of Detail Guidelines for BEM? I have done a web (and forum) search for some kind of standards or guidance related

In theory, yes, but we are typically using E+ for CA code compliance with CBECC-COM which is super locked down.

Thanks for the thorough response. Makes total sense now.. For load sizing, I'd prefer to have temp setpoints constant in

I have one simple and another potentially less simple question related to the Peak Cooling Sensible Heat Gain Components report (and its Peaking Heating counterpart). I'll keep the two questions separate for good housekeeping.

Question: How should I read these timestamp values? 02-SEP-06:02 26-JUL-08:01 07-SEP-08:01

I would expect 02-Sep would be Sep 2nd.. Then I'd infer that 06:02 means 5:02 or 6:02am, which doesn't make sense to me. First of all, I wouldn't expect a timestep to fall on 01 and 02 after the hour. I also wouldn't expect all my zones to have cooling peaks early in the morning.

Thanks @Julien Marrec - That's what I deduced, and that's also the info I found from the I/O ref guide that I linked to

EnergyPlus Peak Gain Components Report - Opaque Surface Conduction and Other Heat Addition I have one simple and another

EnergyPlus Peak Gain Components Report I have one simple and another potentially less simple question related to the Pea

EnergyPlus Peak Gain Components Report I have one simple and another potentially less simple question related to the Pea

This looks like computer permissions issues to me.. The first image shows access is denied while trying to access the pr

Keep in mind that the goal here shouldn't be to determine that software X calculates loads that are 10% lower than softw

Based on the limited information provided, those results don't seem obviously wrong to me. A 9.25 COP AC chiller seems v

Hi Jason - It looks like SyncBack Pro might be what I was looking for.. It seems like they have filter settings that can

Auto Backup Utility for Energy Modeling Files (filter by file extension) I am looking for a good way to automatically ba

I have been experiencing similar issues with inconsistency in daylight calculations within the VE. It's been happening m