Whole Building Modeling Using OpenStudio Commercial Buildings Research Group Andrew Parker December 2016
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1 Whole Building Modeling Using OpenStudio Commercial Buildings Research Group Andrew Parker December 2016 NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC.
2 Agenda Baseline Automation Parametric Analysis Tool 2.0 Roadmap 2
3 OpenStudio Killer Feature: Measures Measures: scripts that operate on model & results Transform model e.g., replace constructions, daylighting package, etc. Perform these actions repeatedly, consistently & quickly on any model An open way of extending functionality & transferring knowledge Thanks! Ich bin expert! Help! 3
4 OpenStudio Killer Feature: Measures Measures: scripts that operate on model & results Transform model e.g., replace constructions, daylighting package, etc. Perform these actions repeatedly, consistently & quickly on any model An open way of extending functionality & transferring knowledge Can be arbitrarily surgical, e.g., daylighting measure sensitive to space-type Daylighting Package Add Heat Recovery 4
5 Baseline Automation What Is It? Input: Proposed (as-designed) model Space types assigned Window construction types assigned Create Baseline Building Output: 90.1 Appendix G baseline model Internal loads Construction properties HVAC systems, controls, and efficiencies 5
6 Motivation Xcel Energy EDA Program pays for energy modeling to inform design. Incentive based on energy savings. As code stringency increases: Savings shrink Therefore incentives shrink but req d modeling effort does not Automation helps more of the project budget go toward meaningful analysis 6
7 How it works Remove external shading devices Shrink the windows and skylights, if necessary Make sure all spaces are assigned stories Modify internal loads (just LPDs for 90.1) Add daylighting controls to each zone Apply prescribed construction types Set properties of those constructions Remove existing HVAC Add HVAC system w/ correct components Set properties used for air system sizing (SAT, delta-t) Add SAT reset, economizers, pressure reset, damper pos. 7
8 How it works (cont d) Set properties for water loop sizing Run a sizing run to autosize HVAC equipment Add controls that are determined based on cfm, gpm, %OA, etc. Apply baseline allowable fan power Multiple boilers/chillers/cooling towers per capacity Run a sizing run to size newly added boilers/chillers/cooling towers Apply baseline pumping power Apply minimum efficiency and performance curves for all HVAC equipment based on type and capacity 8
9 Challenges Daylighting Controls Reality never as simple as examples Not everything is in model Cubicles Shelves 9
10 Challenges Ventilation Rates G Ventilation. Minimum ventilation system outdoor air intake flow shall be the same for the proposed and baseline building designs. I interpreted this as: Keep per-area and per-person OA rates from proposed (currently assumes proposed is ventilating at minimum required) If baseline system is MZ VAV, use VRP calculations If all zones set to 30% minimum damper position, VRP often reqs > 90% OA Instead, increase MDP on critical zones until system ventilation efficiency = 60% This can mean higher minimum intake rates than proposed Credits DOAS systems for ventilating more efficiently This is an area that needs more work/thought. Plan on investigating approach taken by T24/CEC. 10
11 Limitations 80/20 Approach Currently Unsupported Lighting controls (occ/vac sensors) are assumed to already be present in proposed lighting schedules, and will not be added or removed Exterior lighting in the baseline model is left as found in proposed Optimal start of HVAC systems is not supported Skylights are not added to model, but existing skylights are scaled per Appendix G skylight-to-roof areas No fan power allowances for MERV filters or ducted supply/return present in proposed model HVAC Laboratory-specific ventilation is not handled Kitchen ventilation is not handled; exhaust fans left as found in proposed Commercial refrigeration equipment is left as found in proposed Transformers are not added to the baseline model Zone humidity control present in the proposed model HVAC systems is not added to baseline HVAC Known issues or limitations Some control and efficiency determinations do not scale capacities/flow rates down to reflect zone multipliers Daylighting control illuminance setpoint does not vary based on space type Daylighting area calcs do not include windows in non-vertical walls Daylighting area calcs do not include skylights in non-horizontal roofs 11
12 Testing & Validation ~20 real buildings From 3 engineering/modeling firms Group14 Engineering Taylor Roberts Ambient Energy Matt Steen, Eric Ringold NORESCO Matt Leach Plus, community involvement Julien Marrec 12
13 Supported Standards Most heavily tested & BETA Not heavily tested, but working well NECB (Canada) In progress by NRCAN ECBC (India) In progress by LBNL & IIIT aka Addendum BM /fixed baseline Coming in FY17 by PNNL 13
14 Parametric Analysis Tool (PAT) 2.0 Why? New pattern for developers (web technologies) Less fragile file format New capabilities Optimization Sampling 14
15 PAT 2.0 Demo 15
16 OpenStudio Roadmap PAT 2.0 Optimization, sampling Run on cloud New geometry editor Simpler than SketchUp Free Expanded support for advanced controls More Measures Portfolio-scale modeling applications 16
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