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Releases: NREL/OpenStudio-ERI

OpenStudio-ERI v1.2.1

11 May 22:54
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OpenStudio-ERI version 1.2.1 has been released. Two packages are available, a minimal zip with a handful of weather files and full zip with all US TMY3 weather files.

The OpenStudio-ERI workflow calculates an Energy Rating Index (ERI) using the Department of Energy's OpenStudio/EnergyPlus building simulation platform. The open-source workflow is intended to be used by residential software tools that provide a HPXML building description file.

OpenStudio-ERI v1.2.1 uses OpenStudio v3.1.0, EnergyPlus v9.4.0, and a proposed HPXML v3.1.

Please visit the OpenStudio-ERI v1.2.1 documentation for instructions on how to get started, how to connect software tools to the workflow, etc.

New Features

  • Revises shared mechanical ventilation preconditioning control logic to operate less often.

OpenStudio-ERI v1.1.2

11 May 22:36
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OpenStudio-ERI version 1.1.2 has been released. Two packages are available, a minimal zip with a handful of weather files and full zip with all US TMY3 weather files.

The OpenStudio-ERI workflow calculates an Energy Rating Index (ERI) using the Department of Energy's OpenStudio/EnergyPlus building simulation platform. The open-source workflow is intended to be used by residential software tools that provide a HPXML building description file.

OpenStudio-ERI v1.1.2 uses OpenStudio v3.1.0, EnergyPlus v9.4.0, and a proposed HPXML v3.1.

Please visit the OpenStudio-ERI v1.1.2 documentation for instructions on how to get started, how to connect software tools to the workflow, etc.

New Features

  • Revises shared mechanical ventilation preconditioning control logic to operate less often.

OpenStudio-ERI v1.2.0

30 Apr 15:37
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OpenStudio-ERI version 1.2.0 has been released. Two packages are available, a minimal zip with a handful of weather files and full zip with all US TMY3 weather files.

The OpenStudio-ERI workflow calculates an Energy Rating Index (ERI) using the Department of Energy's OpenStudio/EnergyPlus building simulation platform. The open-source workflow is intended to be used by residential software tools that provide a HPXML building description file.

OpenStudio-ERI v1.2.0 uses OpenStudio v3.1.0, EnergyPlus v9.4.0, and a proposed HPXML v3.1.

Please visit the OpenStudio-ERI v1.2.0 documentation for instructions on how to get started, how to connect software tools to the workflow, etc.

New Features

  • Adds ENERGY STAR ERI Target workflow for new construction in accordance with ENERGY STAR Certification System for Homes and Apartments Using an Energy Rating Index-Based Compliance Path.
    • Optional SoftwareInfo/extension/EnergyStarCalculation/Version (values like "SF_National_3.1"; required if running ENERGY STAR calculation).
    • Breaking change: Building/Site/Address/StateCode (values like "CO" or "FL") now required.
    • Breaking change: For windows, Window/PerformanceClass (values of "residential" or "architectural") now required.
    • Breaking change: For shared boilers, HeatingSystem/HeatingCapacity, HeatingSystem/extension/SharedLoopWatts, and HeatingSystem/extension/FanCoilWatts (fan coil only) now required.
    • Breaking change: For air distribution systems with ducts, AirDistribution/NumberofReturnRegisters now required.
    • Breaking change: For shared recirculation hot water systems, HotWaterDistribution/extension/SharedRecirculation/PumpPower now required.
    • Optional extension/SharedLoopMotorEfficiency for shared boilers, chillers, cooling towers, and GSHPs w/ shared loop and extension/SharedRecirculation/MotorEfficiency for shared recirculation hot water systems.
  • Breaking change: Heating/cooling component loads no longer calculated by default for faster performance; use --add-component-loads argument if desired.
  • Allows DuctLeakageMeasurement & ConditionedFloorAreaServed to not be specified for ductless fan coil systems; Breaking change: AirDistributionType is now required for all air distribution systems.
  • Switches room air conditioner model to use Cutler performance curves.
  • Shared systems now preserved in the Rated Home (as opposed to configuring, e.g., the equivalent central AC w/ SEEReq for a chiller).
  • Removes limitation that a shared water heater serving a shared laundry room can't also serve dwelling unit fixtures (i.e., FractionDHWLoadServed is no longer required to be zero).
  • When Reference/Rated water heater fuels are determined by predominant water/space heating fuels, fossil fuel is now selected in the case of a tie.
  • Adds IDs to schematron validation errors/warnings when possible.

Bugfixes

  • Prevents a solar hot water system w/ SolarFraction=1.
  • Fixes room air conditioner performance curve.
  • Fixes heating load fractions for boiler w/ WLHP.
  • Water loop heat pumps no longer get added electric backup heating in the Rated Home.

OpenStudio-ERI v1.1.1

26 Mar 21:18
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OpenStudio-ERI version 1.1.1 has been released. Two packages are available, a minimal zip with a handful of weather files and full zip with all US TMY3 weather files.

The OpenStudio-ERI workflow calculates an Energy Rating Index (ERI) using the Department of Energy's OpenStudio/EnergyPlus building simulation platform. The open-source workflow is intended to be used by residential software tools that provide a HPXML building description file.

OpenStudio-ERI v1.1.1 uses OpenStudio v3.1.0, EnergyPlus v9.4.0, and a proposed HPXML v3.1.

Please visit the OpenStudio-ERI v1.1.1 documentation for instructions on how to get started, how to connect software tools to the workflow, etc.

New Features

  • Allow Slab/ExposedPerimeter to be zero.
  • ClothesDryer/ControlType is no longer required if 301 version >= 2019A
  • Moves additional error-checking from the ruby measure to the schematron validator.
  • Adds more detail to error messages regarding the wrong data type in the HPXML file.
  • Adds error-checking for negative SEEReq results for shared cooling systems.
  • Relaxes tolerance for duct leakage to outside warning when ducts solely in conditioned space.

Bugfixes

  • Fixes ruby error if elements (e.g., SystemIdentifier) exist without the proper 'id'/'idref' attribute.
  • Fixes error if boiler/GSHP pump power is zero.
  • Fixes possible "Electricity category end uses do not sum to total" error due to boiler pump energy.
  • Fixes possible "Construction R-value ... does not match Assembly R-value" error for highly insulated enclosure elements.

OpenStudio-ERI v1.1.0

10 Feb 01:27
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OpenStudio-ERI version 1.1.0 has been released. Two packages are available, a minimal zip with a handful of weather files and full zip with all US TMY3 weather files.

The OpenStudio-ERI workflow calculates an Energy Rating Index (ERI) using the Department of Energy's OpenStudio/EnergyPlus building simulation platform. The open-source workflow is intended to be used by residential software tools that provide a HPXML building description file.

OpenStudio-ERI v1.1.0 uses OpenStudio v3.1.0, EnergyPlus v9.4.0, and a proposed HPXML v3.1.

Please visit the OpenStudio-ERI v1.1.0 documentation for instructions on how to get started, how to connect software tools to the workflow, etc.

New Features

  • Implements ANSI/RESNET/ICC Standard 301-2019 Addendum B. ERICalculation/Version can now be "2019AB" in the HPXML files.
    • Breaking change: New HVAC installation quality inputs required for air conditioners, heat pumps, and furnaces.
    • Adds modeling of dehumidifiers.
  • Adds modeling of generators (generic on-site power production).
  • Adds modeling of mini-split air conditioners.
  • Allows requesting hourly unmet heating/cooling loads.
  • Includes hot water loads (in addition to heating/cooling loads) when hourly total loads are requested.
  • Breaking change: Simplifies inputs for fan coils and water loop heat pumps by A) removing HydronicAndAirDistribution element and B) moving WLHP inputs from extension elements to HeatPump element.
  • Breaking change: One of the three duct leakage input types is now required for AirDistribution systems.
  • Breaking change: For ERI____Home.csv output files, the first two sections are now prefixed with "Fuel Use:" and "End Use:", respectively.
  • Adds HPXML default values (e.g., Reference Home autosized HVAC capacities) to the four ERI____Home.xml files.
  • Overhauls documentation to be more comprehensive and standardized.

Bugfixes

  • Improved modeling of window/skylight interior shading -- better reflects shading coefficient inputs.
  • Adds various error-checking to the schematron validator.
  • Adds error-checking for empty IDs in the HPXML file.
  • Fixes possible "Error: Electricity category end uses (X) do not sum to total (X)." for a heat pump water heater.
  • Fixes possible OpenStudio ForwardTranslator "surface construction conflicts" errors.
  • HVAC sizing improvements for floors above crawlspaces/basements and walls.
  • Fixes schematron file not being valid per ISO Schematron standard.
  • Fixes error when using energy_rating_index.rb --cache-weather.

OpenStudio-ERI v1.0.0

29 Oct 15:20
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OpenStudio-ERI version 1.0.0 has been released. Two packages are available, a minimal zip with a handful of weather files and full zip with all US TMY3 weather files.

The OpenStudio-ERI workflow calculates an Energy Rating Index (ERI) using the Department of Energy's OpenStudio/EnergyPlus building simulation platform. The open-source workflow is intended to be used by residential software tools that provide a HPXML building description file.

OpenStudio-ERI v1.0.0 uses OpenStudio v3.1.0, EnergyPlus v9.4.0, and a proposed HPXML v3.1.

Please visit the OpenStudio-ERI v1.0.0 documentation for instructions on how to get started, how to connect software tools to the workflow, etc.

New Features

  • Updates to OpenStudio 3.1.0/EnergyPlus 9.4.0.
  • Breaking change: Deprecates WeatherStation/WMO HPXML input, use WeatherStation/extension/EPWFilePath instead.
  • Implements water heater Uniform Energy Factor (UEF) model; replaces RESNET UEF->EF regression. Breaking change: FirstHourRating is now a required input for storage water heaters when UEF is provided.
  • Adds optional HPXML fan power inputs for most HVAC system types. Breaking change: Removes ElectricAuxiliaryEnergy input for non-boiler heating systems.
  • Uses air-source heat pump cooling performance curves for central air conditioners.
  • Accommodates common walls adjacent to unconditioned space by using HPXML surfaces where InteriorAdjacentTo == ExteriorAdjacentTo.
  • Additional validation checks and error-checking.
  • Various small updates to ASHRAE 140 test files.
  • Release packages now include RESNET HERS test files/results; all tests pass RESNET's proposed stringent acceptance criteria.

Bugfixes

  • EnergyPlus 9.4.0 fix for negative window solar absorptances at certain hours.
  • Fixes ceiling fan configuration in Reference/Rated Homes for 301-2019.
  • Fixes airflow timeseries outputs to be averaged instead of summed.

OpenStudio-ERI v0.11.0 Beta

22 Sep 14:52
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Pre-release

OpenStudio-ERI version 0.11.0 Beta has been released. Two packages are available, a minimal zip with a handful of weather files and full zip with all US TMY3 weather files.

The OpenStudio-ERI workflow calculates an Energy Rating Index (ERI) using the Department of Energy's OpenStudio/EnergyPlus building simulation platform. The open-source workflow is intended to be used by residential software tools that provide a HPXML building description file.

OpenStudio-ERI v0.11.0 Beta uses OpenStudio v3.0.0, EnergyPlus v9.3.0, and a proposed HPXML v3.1.

Please visit the OpenStudio-ERI v0.11.0 Beta documentation for instructions on how to get started, how to connect software tools to the workflow, etc.

New Features

  • New Schematron validation (301validator.xml) replaces custom ruby validation (301validator.rb)
  • Ability to model shared systems for Attached/Multifamily dwelling units
    • Shared HVAC systems (cooling towers, chillers, central boilers, water loop heat pumps, fan coils, ground source heat pumps on shared hydronic circulation loops)
    • Shared water heaters serving either A) multiple dwelling units' service hot water or B) a shared laundry/equipment room, as well as shared hot water recirculation systems
    • Shared appliances (e.g., clothes dryer in a shared laundry room)
    • Shared ventilation systems (optionally with preconditioning equipment and recirculation)
    • Shared PV systems
    • [Breaking Change] IsSharedSystem now required for boilers and ground-to-air heat pumps, water heating systems, ventilation systems, and PV systems
    • [Breaking Change] IsSharedAppliance now required for clothes washers, clothes dryers, and dishwashers
    • [Breaking Change] Appliances located in MF spaces (i.e., "other") must now be specified in more detail (i.e., "other heated space", "other non-freezing space", "other multifamily buffer space", or "other housing unit")
  • Allows multiple mechanical ventilation systems (VentilationFan)
  • [Breaking Change] For hydronic distributions, HydronicDistributionType is now required
  • [Breaking Change] For DSE distributions, AnnualHeatingDistributionSystemEfficiency and AnnualCoolingDistributionSystemEfficiency are both always required
  • [Breaking Change] Adds RadiantBarrierGrade as a required input if a roof has a radiant barrier
  • [Breaking Change] Adds extension/PumpPowerWattsPerTon as a required input for ground-to-air heat pumps
  • [Breaking Change] Renames DuctLeakageTestingExemption to DuctLeakageToOutsideTestingExemption, to clarify that it is different from the total duct leakage testing exemption in ANSI/RESNET/ACCA 310
  • [Breaking Change] New FanPowerDefaulted and FlowRateNotTested elements must be provided when ventilation systems have defaulted fan power or unmeasured airflow
  • Allows homes without a refrigerator, dishwasher, range/oven, clothes washer, and/or clothes dryer
  • Rated Home equipment capacities now automatically increased if smaller than auto-calculated design loads
  • Updates Reference Home to have a single water heater even when there are multiple water heaters
  • Updates Reference Home unconditioned basement insulation to be the basement ceiling instead of basement walls
  • Updates Reference Home conditioned basement insulation R-values per RESNET SCC clarifications
  • Various updates to RESNET test files
  • Updates ASHRAE 140 tests to use TMY3 instead of TMY weather
  • Adds more reporting of warnings/errors to run.log

Bugfixes

  • Fixes ERI calculation for some homes with multiple HVAC systems
  • Fixes pump energy for boilers and ground source heat pumps
  • Fixes incorrect gallons of hot water use reported when there are multiple water heaters
  • No longer report unmet load for buildings where the HVAC system only meets part of the load (e.g., room AC serving 33% of the load)
  • ASHRAE 140 test files now have only heating or cooling systems, not both

OpenStudio-ERI v0.10.0 Beta

09 Jun 21:49
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Pre-release

OpenStudio-ERI version 0.10.0 Beta has been released. Two packages are available, a minimal zip with a handful of weather files and full zip with all US TMY3 weather files.

The OpenStudio-ERI workflow calculates an Energy Rating Index (ERI) using the Department of Energy's OpenStudio/EnergyPlus building simulation platform. The open-source workflow is intended to be used by residential software tools that provide a HPXML building description file.

OpenStudio-ERI v0.10.0 Beta uses OpenStudio v3.0.0, EnergyPlus v9.3.0, and a proposed HPXML v3.1.

Please visit the OpenStudio-ERI v0.10.0 Beta documentation for instructions on how to get started, how to connect software tools to the workflow, etc.

New Features

  • Implements ANSI/RESNET/ICC Standard 301-2019 and Addendum A. Shared systems are not yet supported.
    • ERICalculation/Version can be "2019A" or "2019"
    • [Breaking change] Attic/WithinInfiltrationVolume is required for unvented attics
    • [Breaking change] Foundation/WithinInfiltrationVolume is required for unvented crawlspaces and unconditioned basements
    • ExteriorAdjacentTo can be "other heated space", "other multifamily buffer space", or "other non-freezing space" for Wall, RimJoist, FoundationWall, and FrameFloor elements
    • DuctLocation can be "other housing unit", "other heated space", "other multifamily buffer space", or "other non-freezing space"
    • WaterHeater/Location can be "other housing unit", "other heated space", "other multifamily buffer space", or "other non-freezing space"
    • [Breaking Change] Location is now a required element for dishwashers and cooking ranges.
    • Location can be "other" for all appliances
    • [Breaking change] Window/FractionOperable is required
    • VentilationFan/TestedFlowRate is now optional and can be excluded for unmeasured mechanical ventilation flow rates
    • VentilationFan/FanPower is now optional and can be excluded for unknown mechanical ventilation fan power
    • [Breaking change] LabelUsage is required for clothes washers
    • [Breaking change] LabelElectricRate, LabelGasRate, LabelAnnualGasCost, and LabelUsage are required for dishwashers
    • [Breaking Change] HVACDistribution/ConditionedFloorAreaServed is now required for air distribution systems
    • [Breaking Change] For FrameFloors ExteriorAdjacentTo, "other housing unit above" and "other housing unit below" are replaced with "other housing unit"; floors adjacent to any "other ..." MF space type must have the extension/OtherSpaceAboveOrBelow element set to "above" or "below".
  • [Breaking Change] Lighting inputs now use LightingType[LightEmittingDiode | CompactFluorescent | FluorescentTube] instead of ThirdPartyCertification="ERI Tier I" or ThirdPartyCertification="ERI Tier II".
  • Allows "exterior wall", "under slab", and "roof deck" for DuctLocation.
  • Allows PortableHeater, Fireplace, and FloorFurnace for heating system types.
  • Allows "wood" and "wood pellets" as fuel types for HVAC systems, water heaters, and appliances.
  • Allows additional hourly outputs: airflows (e.g., infiltration, mechanical ventilation, natural ventilation, whole house fan) and weather (e.g., temperatures, wind speed, solar).
  • Improved inferred infiltration height calculation for homes w/ conditioned basements.
  • Reference Home mechanical ventilation that supplements infiltration is now always a balanced system.
  • Additional runtime improvements.
  • [Breaking Change] Many changes to HPXML test files to conform to latest RESNET Publication 002.
  • ERI____Home.xml files:
    • [Breaking Change] WaterHeatingSystem/PerformanceAdjustment is now a multiplier (e.g., 0.92) instead of a derate (e.g., 0.08).
    • Adds AirInfiltrationMeasurement/extension/InfiltrationHeight and AirInfiltrationMeasurement/extension/Aext as diagnostic outputs.
  • Error-checking:
    • Adds more space type-specific error checking of adjacent surfaces.
    • Adds additional HPXML datatype checks.
    • Adds a warning if a HVACDistribution system has ducts entirely within conditioned space and non-zero leakage to the outside.
    • Adds warnings if appliance inputs may be inappropriate and result in negative energy or hot water use.

Bugfixes

  • Reference Homes w/ ACs & furnaces now use the same W/cfm (derived from EAE) for both heating and cooling.
  • Fixes error if a home has both a dual-fuel heat pump and an air-source heat pump.
  • Fixes exterior air film and wind exposure of frame floors over ambient conditions.
  • Fixes air films for ceiling surfaces.
  • Preserve Rated Home appliance locations in the Reference Home.
  • Fixes heat pump defrost control to be Timed instead of OnDemand.
  • Fixes error if there's a FoundationWall whose height is less than 0.5 ft.
  • Fixes vented attic ventilation rate.
  • Reported unmet heating/cooling load now correctly excludes latent energy.
  • Ground-source heat pump backup fuel is now correctly honored instead of always using electricity.

OpenStudio-ERI v0.9.0 Beta

28 Apr 15:21
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Pre-release

OpenStudio-ERI version 0.9.0 Beta has been released. Two packages are available, a minimal zip with a handful of weather files and full zip with all US TMY3 weather files.

The OpenStudio-ERI workflow calculates an Energy Rating Index (ERI) using the Department of Energy's OpenStudio/EnergyPlus building simulation platform. The open-source workflow is intended to be used by residential software tools that provide a HPXML building description file.

OpenStudio-ERI v0.9.0 Beta uses OpenStudio v3.0.0, EnergyPlus v9.3.0, and a proposed HPXML v3.1.

Please visit the OpenStudio-ERI v0.9.0 Beta documentation for instructions on how to get started, how to connect software tools to the workflow, etc.

New Features

  • [Breaking Change] Updates to OpenStudio v3.0.0 and EnergyPlus 9.3.
  • [Breaking Change] Allows 301-2014 Addenda D & L to be used by providing inputs for A) duct leakage testing exemptions or B) total duct leakage in lieu of leakage to the outside. These inputs should only be used if the conditions specified in ANSI/RESNET/ICC© 301 have been appropriately met. Enumerations for SoftwareInfo/extension/ERICalculation/Version are now "latest", "2014ADEGL", "2014ADEG", "2014ADE", "2014AD", "2014A", "2014".
  • [Breaking Change] BuildingConstruction/ResidentialFacilityType is now required. Valid choices are: "single-family detached", "single-family attached", "apartment unit", "manufactured home".
  • Improves inferred infiltration height for conditioned basements (including walkout basements).
  • A new HPXML input WeatherStation/extension/EPWFilePath can be used instead of WeatherStation/WMO to point directly to the EPW file of interest.
  • Adds hot water outputs (gallons), disaggregated by end use, to annual output. Also available for timeseries outputs.
  • Improved desuperheater model; can now be connected to heat pump water heaters.
  • Solar thermal systems modeled with SolarFraction can now be connected to combi water heating systems.
  • Small improvement to calculation of component loads.
  • Allows buildings to have HVAC systems that do not condition 100% of the load (i.e., where sum of fraction heat/cool load served is greater than zero and less than one).
  • Populates more information in the ERI___Home.xml files (e.g., plug load kWh/yr).
  • [Breaking Change] The --no-ssl argument has been deprecated.
  • [Breaking Change] Switches from BuildingConstruction/extension/FractionofOperableWindowArea to Window/FractionOperable in HPXML test files.

Bugfixes

  • Fixes an unsuccessful simulation for buildings with multiple HVAC air distribution systems, each with multiple duct locations.
  • Fixes an unsuccessful simulation for buildings where the sum of multiple HVAC systems' fraction load served was slightly above 1 due to rounding.
  • Small fix for interior partition wall thermal mass model.

OpenStudio-ERI v0.8.0 Beta

10 Mar 14:45
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Pre-release

OpenStudio-ERI version 0.8.0 Beta has been released. Two packages are available, a minimal zip with a handful of weather files and full zip with all US TMY3 weather files.

The OpenStudio-ERI workflow calculates an Energy Rating Index (ERI) using the Department of Energy's OpenStudio/EnergyPlus building simulation platform. The open-source workflow is intended to be used by residential software tools that provide a HPXML building description file.

OpenStudio-ERI v0.8.0 Beta uses OpenStudio v2.9.1, EnergyPlus v9.2.0, and a proposed HPXML v3.1.

Please visit the OpenStudio-ERI v0.8.0 Beta documentation for instructions on how to get started, how to connect software tools to the workflow, etc.

Breaking Changes

  • The --skip-validation or -s argument has been removed, it's no longer needed now that the primary runtime bottleneck has been addressed.
  • ERI____Home.csv output files:
    • Disaggregates "Electricity: Heating Fans/Pumps" from "Electricity: Heating", "Electricity: Cooling Fans/Pumps" from "Electricity: Cooling", and "Electricity: Television" from "Electricity: Plug Loads"
    • Renames "Annual Load" to "Load" and "Annual Unmet Load" to "Unmet Load"
  • Requesting hourly output is now done via an --hourly TYPE (e.g., --hourly fuels --hourly temperatures) argument instead of --hourly-output. See documentation for more details.
  • Weather cache files are now in .csv instead of .cache format. Re-run --cache-weather if using custom weather files.
  • extension/StandbyLoss changed to StandbyLoss for indirect water heaters.
  • Site/extension/DisableNaturalVentilation changed to BuildingConstruction/extension/FractionofOperableWindowArea for ASHRAE 140-based test files.

New Features

  • Allows modeling of whole-house fans.
  • Adds optional CompressorType input for ACs/ASHPs.
  • Improved natural ventilation algorithm that reduces the potential for incurring additional heating energy.
  • Improved calculation of component heating/cooling loads.
  • Hot water temperatures are now included in the ERI____Home.xml files.
  • Runtime performance improvements, particularly for Windows.
  • Additional hourly outputs can be requested: energy by end use, total heating/cooling loads, and component heating/cooling loads.
  • ERI version in the HPXML file can now be entered as "latest".
  • Additional HPXML error-checking.

Bugfixes

  • Fix for central fan integrated supply (CFIS) fan energy.
  • Fix simulation error when FractionHeatLoadServed (or FractionCoolLoadServed) sums to slightly greater than 1.
  • Fix for running simulations on a different drive (either local or remote network).
  • Fix for HVAC sizing error when latitude is exactly 64 (Big Delta, Alaska).
  • Fix for DSE not being incorporated in the heating/cooling in ERI____Home_Hourly.csv output files.
  • Fix potential simulation error for buildings with foundation walls.
  • Fix radiation heat transfer when conditioned basement walls have a window/door.
  • Fixes weather download location.
  • Fixes Rated Home infiltration rate for homes with below-grade stories and using natural ACH.