[Bldg-sim] the use of dynamic energy simulation tool

Michael Wetter mwetter at lbl.gov
Wed Feb 1 22:25:43 PST 2012


Deuk-Woo

To add to Jeff's answer of point 4), Modelica models that allow dynamic
simulation of building energy and control systems are available from
http://simulationresearch.lbl.gov/modelica, including source code. These
models will run at sub-second time steps (when fast transients are present)
and can model realistic representations of control sequences.

The models can also be linked to hardware through BACnet and A/D converters
using the Building Controls Virtual Test Bed,
http://simulationresearch.lbl.gov/bcvtb.

See the papers, manuals and user guides at these web sites for more
detailed information.

All the best,

Michael

2012/2/1 Jeff Haberl <jhaberl at tamu.edu>

>  Dear Deuk-Woo,
>
>
>
> Here are a few comments on your questions:
>
>
>
> 1. To get energy efficiency incentives, such as LEED certificate.
>
> 2. To compare alternatives (wall material, window, building design) in
> architect point of view.
>
> 3. To compare alternatives (system type and configuration, COP, etc.) in
> mechanical engineer point of view.
>
>
>
> For Items #1 - 3, EQUEST, EP+ or TRNSYS will do. In the U.S. EQUEST is the
> most widely used by the AE community. Note, for most of these simulations
> an hourly simulation will do, which is not a true dynamic simulation.
>
>
>
> 4. To develop energy efficient control strategies and to test DDC
> controllers. (BEMS and emulation; maybe electric engineering field or ??)
>
>
>
> For this you'll need MATLAB and a true dynamic simulation platform (i.e.,
> it usually needs 1 sec or less time steps and true dynamic equations). Many
> of the U.S. controls companies have developed extensive tools for this,
> including Modelica/Dymola platforms. However, they do not distribute these
> outside their own companies. MATLAB is fast becoming a platform of choice,
> perhaps because most universities teach with it. There are other platforms
> as well, check with your local ME or EE controls Prof. Some that come to
> mind are HVACSiM+ (by George Walton at NIST).
>
>
>
> 5. To identify the system mal-function (such as AHU) comparing between
> “predicted” energy and “actual” energy in real-time. (BEMS, maybe
> electric engineering field??)
>
>
>
> This is a tough one. LBNL and PNNL have been working on this for some
> time. PNNL has their AHU fault detection program, and other programs. LBNL
> has their controls test bed up and running. You might also check with the
> Chair of ASHRAE TC 7.5 to see what the latest RPs for controls simulation.
> This TC has most of the knowledgable folks on it (which does not include
> me).
>
>
>
> 6. Building Simulator: which is used to training building managers or
> operators or learners (students) in HVAC system operation realistically
> (such as flight simulator)
>
>
>
> Check out Joe Deringer's LEARNHVAC web page...just amazing...there is also
> other emulator work at LBNL that Phil Haves and Michael Wetter are doing.
>
>
>
> 7. To “JUST” verify Building behavior (HVAC operation, energy
> consumption, etc) over the whole year period with different whether
> conditions in IWEC and TMY. (to see "what could be")
>
>
>
> This can be done with forward models (i.e., simulation) or inverse models
> (i.e., ASHRAE RP1050), or a combination of both. You can also use component
> models such as those available from ASHRAe (HVAC01 and HVAC02 toolkit,
> RP865, RP827, etc).
>
>
>
> There are other proprietary tools that diagnose HVAC problems, some have
> published results, some not. You'll find lots of papers (apx., 3 - 5,000)
> on our Lab's web site about our commissioning work, which includes air-side
> simulation as a diagnostic.
>
>
>
> Hope this helps.
>
>
>
> Jeff
>
>
>
>
> 8=!  8=)  :=)  8=)  ;=)  8=)  8=(  8=)  8=()  8=)  8=|  8=)  :=')  8=)8=?
>
> Jeff S. Haberl, Ph.D.,P.E., FASHRAE..............jhaberl at tamu.edu
>
> Professor............................................................Office
> Ph: 979-845-6507
>
> Department of Architecture.............................Lab Ph:979-845-6065
>
> Energy Systems Laboratory.............................FAX: 979-862-2457
>
> Texas A&M University.....................................77843-3581
>
> College Station, Texas, USA, 77843..................URL:www.esl.tamu.edu
>
> 8=/  8=)  :=)  8=)  ;=)  8=)  8=()  8=)  :=)  8=)  8=!  8=)  8=? 8=)8=0
>   ------------------------------
> *From:* bldg-sim-bounces at lists.onebuilding.org [
> bldg-sim-bounces at lists.onebuilding.org] on behalf of 김덕우 [
> deukwookim at skku.edu]
> *Sent:* Tuesday, January 31, 2012 11:22 PM
> *To:* bldg-sim at lists.onebuilding.org
> *Subject:* [Bldg-sim] the use of dynamic energy simulation tool
>
>   Dear all,
>
>
>
> I have been thinking about the use of dynamic energy simulation tool (e.g.
> whole building simulation tool, such as E+, ESP-r, TRNSYS, SPARK, etc).
>
>
>
> The usage area of the tool would be classified into two, academic area and
> practical area.
>
>
>
> But I really want to hear your high-level opinion on the practical areas.
>
>
>
> The typical usage of energy simulation program in practice could be listed
> as follows (as far as I know),
>
>
>
> 1.     To get energy efficiency incentives, such as LEED certificate.
>
> 2.     To compare alternatives (wall material, window, building design)
> in architect point of view.
>
> 3.     To compare alternatives (system type and configuration, COP, etc.)
> in mechanical engineer point of view.
>
> 4.     To develop energy efficient control strategies and to test DDC
> controllers. (BEMS and emulation; maybe electric engineering field or ??)
>
> 5.     To identify the system mal-function (such as AHU) comparing between
> “predicted” energy and “actual” energy in real-time. (BEMS, maybe
> electric engineering field??)
>
> 6.     Building Simulator: which is used to training building managers or
> operators or learners (students) in HVAC system operation realistically
> (such as flight simulator)
>
> 7.     To “JUST” verify Building behavior (HVAC operation, energy
> consumption, etc) over the whole year period with different whether
> conditions in IWEC and TMY. (to see "what could be")
>
>
>
> I think that the large portion of usage would be #1.
>
>
>
> But, the problem have been arisen due to the uncertainties and “too many”required input values of dynamic simulation tools.
>
>
>
> As far as I know in South Korea, many people say “these tools are not
> suited to assess building energy performance with acceptable speed. And
> there is no evidence it is helpful to achieve energy reduction actually.
> Something are missing. We (AEC) do not want to do full dynamic simulation.
> We just need a tool that is simple and faster and reliable”.
>
>
>
> These days, the government is willing to move their direction which
> requires architects just to submit a building energy analysis report using
> simple ISO toolkit.
>
> (many of my colleague agree to need of the normative performance method,
> ISO 13790 and DIN 18599.)
>
>
>
> Now, in this situation, we have to rethink about the purpose of doing full
> dynamic energy simulation (E+, ESP-r, TRNSYS, etc) with practicality in
> mind.
>
>
>
> I think that its usage would be more suitable for #4, #5, #6 rather than
> #1, #2, #3. Because #1,#2,#3 can be evaluated using ISO standards with
> acceptable speed and accuracy.
>
> (but I do not know well about the usage in the fields of #4, #5, #6)
>
>
>
> I’m waiting your comments on my thoughts.
>
>
>
> p.s. this topic was discussed in E+ user group before, and the contents
> are slightly revised for better discussions.
>
>
>
> Best Regards,
> Deuk-Woo, Kim
>
>
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