[Bldg-sim] 90.1-2010 Section 11, ECB, question on multiple heat sources

Athalye, Rahul A via Bldg-sim bldg-sim at lists.onebuilding.org
Mon Sep 11 09:17:13 PDT 2017


Hi Chris,

The way I would interpret 11.3.2.(j).2 is that the primary heating source should be selected from the map, and the secondary heating source should be modeled identical to the one in the proposed building. So, in system 9, instead of having the auxiliary heat as electric, it would be natural gas. Would be interested in hearing how others interpret this clause.

Regards,
Rahul


__________________________________________________
Rahul Athalye
Energy Research Engineer
Pacific Northwest National Laboratory
509-372-4297




From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jones, Christopher via Bldg-sim
Sent: Monday, September 11, 2017 8:31 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] 90.1-2010 Section 11, ECB, question on multiple heat sources

I am modeling a project that has air-to-water heat pumps as the main plant. There is a natural gas back-up boiler for those few hours in the year where it is too cold for the heat pumps to meet the heating load.

I am not sure how to interpret 11.3.2.(j).(2) - For systems with mixed fuel heating sources, the system or systems that use the secondary heating source type (the one with the smallest total installed output capacity for the spaces served by the system) shall be modeled identical in the building design and the primary heating source type shall be used in Figure 11.3.2 to determine the budget system type.

In this case, as the heating water loop serves all systems in the building - all systems receive heat from the secondary heating source type at some point in the year - the language of this clause leave me wondering what baseline system to use?

My interpretation is to use System 9 ignoring the back-up natural gas heat source?


Christopher R. Jones, P.Eng.
Technical Specialist
Sustainability & Energy

[cid:image001.png at 01D32ADE.BE4C15C0]
T +1 416-644-0252

2300 Yonge Street, Suite 2300
Toronto, ON M4P 1E4 Canada
wsp.com


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From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Gail Hampsmire via Bldg-sim
Sent: Friday, August 18, 2017 5:20 PM
To: 'bldg-sim at lists.onebuilding.org' <bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>>
Subject: [Bldg-sim] LEED Pilot Alternative Compliance Paths - Minimum Energy Performance / Optimize Energy Performance

Happy Friday to you all!

Several LEED Pilot Alternative Compliance Paths (ACPs) may be of interest to BLDG-SIM Users relevant to LEED BD&C (and in some cases ID&C) EA Prerequisite: Minimum Energy Performance and EA Credit: Optimize Energy Performance.  LEED Pilot ACPs provide an alternate method for complying with the LEED requirements for the specified credit. Projects must register for each Pilot ACP in order to use it on the project; however, there is no obligation for projects to use the alternative path once registered.

1. Alternative Energy Performance Metric (https://www.usgbc.org/credits/eapc95v4).
This Pilot ACP was recently updated to address market feedback (Advocacy letters are no longer required). Project teams may use performance metrics other than cost (Source or Primary energy, Greenhouse Gas Emissions, and Time Dependent Valuation) to document performance improvement, as long as all required metrics are reported. The top two performance metrics are averaged to determine the performance improvement for the project.

2. Energy Performance Metering Path (https://www.usgbc.org/credits/new-construction-core-and-shell-schools-new-construction-retail-new-construction-healthca-95).
This allows projects to use one year of post-occupancy metered data to document performance for newly constructed buildings in lieu of "validation" energy models.  Design phase analysis, and compliance with mandatory ASHRAE provisions is still required in order to pursue this ACP.

3. Alternative Performance Rating Method (https://www.usgbc.org/credits/new-construction-core-and-shell-schools-new-construction-retail-new-construction-healthc-110).
This allows projects to use the new stable baseline methodology established in the ASHRAE 90.1-2016 Performance Rating Method to document building performance. ASHRAE 90.1-2016 includes all details for the baseline model in the body of Appendix G (rather than referencing other sections of ASHRAE 90.1); and allows local code authorities or above-code programs (such as LEED or utility incentive programs) to establish Building Performance Factors that align with the targeted performance for the project application. LEED has established these thresholds to be roughly equivalent to the PNNL Building Performance Factors (BPF) aligning with ASHRAE 90.1-2010, averaged across all ASHRAE climate zones for each rating system.

4. District Energy (https://www.usgbc.org/credits/new-construction-core-and-shell-schools-new-construction-retail-new-construction-healthca-48).
This allows projects to seek a single PEER certification for a District Energy System (DES), and then quickly document Optimize Energy Performance points for LEED project buildings served by the DES. This eliminates the requirement for detailed upstream modeling, and individual review of DES performance for each LEED building project.

Please direct any questions about these Pilot ACPs to the USGBC Contact Us page: https://www.usgbc.org/contactus

Thanks!


Best Regards,
Gail Hampsmire, P.E., LEED Fellow
Technical Director, HVAC/Energy Team

Green Business Certification Inc.
2101 L Street NW I Suite 500 I Washington DC 20037


________________________________


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