RE: [EnergyPlus_Support] ASHRAE 90.1 Proposed Design

The issues are two:

1. If you have a chiller in the real building, the chiller has to respect the mandatory provisions (not only the modeled chiller, also the real chiller, which is more important...).

2. The relative baseline model could have no chillers. You have to determine the baseline system according to Tabel G3.1.1A. We can suppose that the baseline model has DX coils. The modeled DX coils of the baseline model have to respect Table 6.8.1A (for systems 3, 5, and 6) or Table 6.8.1B (for system 4).

I don't know whether my explanation is perfect, but I developed some models of certified buildings and I have understood the issue in this way.

Regards

---In EnergyPlus_Support@xxxxxxxxxxxxxxx, <eee.javed@...> wrote :

Interesting discussion!!
Jim, if the project is claiming 15% savings over ASHRAE base case but chiller COP in proposed case is 5.5 whereas baseline is 6.1 (mandatory requirement). Will the project be still acceptable for appndx G compliance??

Thanks,

On 28 Jul 2014 17:03, "Jim Dirkes jim@... [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

Actually, I think Appendix G allows you to ignore the mandatory provisions for things like insulation and EER. We discussed this recently in our office and it seems that as long as you demonstrate improved annual energy performance compared to the Baseline (which follows all of the mandatory requirements), you are OK.

James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.com
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Monday, July 28, 2014 6:43 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] ASHRAE 90.1 Proposed Design

Thank you very much, Santiago.
But could you please in more detail "The building must also comply with Mandatory provisions (sections x.4), this doesn't mean that the parameters are going to be equal to either Mandatory provisions for Prescriptive requirements."?
If we do not need to change/alter some parameters, how we can comply with .....?
Regards,
Sean

---In EnergyPlus_Support@xxxxxxxxxxxxxxx, <santiagogvelez@...> wrote :
Dear Sean,
Appendix G PRM method requires you to model proposed design as reflected by design or 'as built' documents. The building must also comply with Mandatory provisions (sections x.4), this doesn't mean that the parameters are going to be equal to either Mandatory provisions or Prescriptive requirements.

Cheers,
Santiago.

2014-07-28 7:10 GMT-03:00 seanking.1970@... [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx>:

Dear all,

"The simulation model of the proposed design shall be consistent with the design documents including proper accounting of fenestration and opaque envelope types and area; interior lighting power and controls; HVAC system type, sizes, and controls; and service hot water heating systems and controls."

Some other interpretation says "must be exactly as shown on design drawings/documents" (sorry, cannot find where now).

My question is: do these settings need to be modified in order to comply with the Standard's mandatory provisions and prescriptive requirements (such as envelope U-factors, efficiencies of HVAC systems)? My initial thought was we just need to follow the statements shown in first and second paragraphs above, which implies the settings in proposed design can be arbitrary. It looks like I am wrong.

Anybody is clear with it, please give a direction. Thanks a lot.

Best regards,

Sean