Defrost Model Improvements

BuildResidentialHPXML/README.md

@@ -180,6 +180,19 @@ Affects the transient calculation of indoor air temperatures. If not provided, t
 
 <br/>
 
+**Simulation Control: Defrost Model Type**
+
+Research feature to select the type of defrost model. Use standard for default E+ defrost setting. Use advanced for an improved model that better accounts for load and energy use during defrost; using advanced may impact simulation runtime. If not provided, the OS-HPXML default (see <a href='https://openstudio-hpxml.readthedocs.io/en/v1.7.0/workflow_inputs.html#hpxml-simulation-control'>HPXML Simulation Control</a>) is used.
+
+- **Name:** ``simulation_control_defrost_model_type``
+- **Type:** ``Choice``
+
+- **Required:** ``false``
+
+- **Choices:** `standard`, `advanced`
+
+<br/>
+
 **Site: Type**
 
 The type of site. If not provided, the OS-HPXML default (see <a href='https://openstudio-hpxml.readthedocs.io/en/v1.7.0/workflow_inputs.html#hpxml-site'>HPXML Site</a>) is used.

BuildResidentialHPXML/measure.rb

@@ -116,6 +116,14 @@ def arguments(model) # rubocop:disable Lint/UnusedMethodArgument
     arg.setDescription("Affects the transient calculation of indoor air temperatures. If not provided, the OS-HPXML default (see <a href='#{docs_base_url}#hpxml-simulation-control'>HPXML Simulation Control</a>) is used.")
     args << arg
 
+    defrost_model_type_choices = OpenStudio::StringVector.new
+    defrost_model_type_choices << HPXML::AdvancedResearchDefrostModelTypeStandard
+    defrost_model_type_choices << HPXML::AdvancedResearchDefrostModelTypeAdvanced
+    arg = OpenStudio::Measure::OSArgument::makeChoiceArgument('simulation_control_defrost_model_type', defrost_model_type_choices, false)
+    arg.setDisplayName('Simulation Control: Defrost Model Type')
+    arg.setDescription("Research feature to select the type of defrost model. Use #{HPXML::AdvancedResearchDefrostModelTypeStandard} for default E+ defrost setting. Use #{HPXML::AdvancedResearchDefrostModelTypeAdvanced} for an improved model that better accounts for load and energy use during defrost; using #{HPXML::AdvancedResearchDefrostModelTypeAdvanced} may impact simulation runtime. If not provided, the OS-HPXML default (see <a href='#{docs_base_url}#hpxml-simulation-control'>HPXML Simulation Control</a>) is used.")
+    args << arg
+
     site_type_choices = OpenStudio::StringVector.new
     site_type_choices << HPXML::SiteTypeSuburban
     site_type_choices << HPXML::SiteTypeUrban
@@ -4022,6 +4030,13 @@ def self.set_header(runner, hpxml, args)
       hpxml.header.temperature_capacitance_multiplier = args[:simulation_control_temperature_capacitance_multiplier]
     end
 
+    if not args[:simulation_control_defrost_model_type].nil?
+      if (not hpxml.header.defrost_model_type.nil?) && (hpxml.header.defrost_model_type != args[:simulation_control_defrost_model_type])
+        errors << "'Simulation Control: Defrost Model Type' cannot vary across dwelling units."
+      end
+      hpxml.header.defrost_model_type = args[:simulation_control_defrost_model_type]
+    end
+
     if not args[:emissions_scenario_names].nil?
       emissions_scenario_names = args[:emissions_scenario_names].split(',').map(&:strip)
       emissions_types = args[:emissions_types].split(',').map(&:strip)

BuildResidentialHPXML/measure.xml

@@ -3,8 +3,8 @@
   <schema_version>3.1</schema_version>
   <name>build_residential_hpxml</name>
   <uid>a13a8983-2b01-4930-8af2-42030b6e4233</uid>
-  <version_id>89391782-f408-4b0e-9801-b5f67d0f8241</version_id>
-  <version_modified>2024-05-15T20:26:57Z</version_modified>
+  <version_id>d6c720db-f7cf-4aff-b36e-a6e133c6ddc9</version_id>
+  <version_modified>2024-05-17T22:42:28Z</version_modified>
   <xml_checksum>2C38F48B</xml_checksum>
   <class_name>BuildResidentialHPXML</class_name>
   <display_name>HPXML Builder</display_name>
@@ -153,6 +153,24 @@
       <required>false</required>
       <model_dependent>false</model_dependent>
     </argument>
+    <argument>
+      <name>simulation_control_defrost_model_type</name>
+      <display_name>Simulation Control: Defrost Model Type</display_name>
+      <description>Research feature to select the type of defrost model. Use standard for default E+ defrost setting. Use advanced for an improved model that better accounts for load and energy use during defrost; using advanced may impact simulation runtime. If not provided, the OS-HPXML default (see &lt;a href='https://openstudio-hpxml.readthedocs.io/en/v1.7.0/workflow_inputs.html#hpxml-simulation-control'&gt;HPXML Simulation Control&lt;/a&gt;) is used.</description>
+      <type>Choice</type>
+      <required>false</required>
+      <model_dependent>false</model_dependent>
+      <choices>
+        <choice>
+          <value>standard</value>
+          <display_name>standard</display_name>
+        </choice>
+        <choice>
+          <value>advanced</value>
+          <display_name>advanced</display_name>
+        </choice>
+      </choices>
+    </argument>
     <argument>
       <name>site_type</name>
       <display_name>Site: Type</display_name>
@@ -7325,7 +7343,7 @@
       <filename>README.md</filename>
       <filetype>md</filetype>
       <usage_type>readme</usage_type>
-      <checksum>54A95546</checksum>
+      <checksum>65DD9340</checksum>
     </file>
     <file>
       <filename>README.md.erb</filename>
@@ -7342,7 +7360,7 @@
       <filename>measure.rb</filename>
       <filetype>rb</filetype>
       <usage_type>script</usage_type>
-      <checksum>8BEED0CA</checksum>
+      <checksum>4D94208D</checksum>
     </file>
     <file>
       <filename>geometry.rb</filename>

Changelog.md

@@ -20,6 +20,7 @@ __New Features__
   - Small change to default flow rate for imbalanced mechanical ventilation systems.
   - Updated window default interior shade coefficients to be calculated based on SHGC.
   - `AverageCeilingHeight` now used in natural ACH/CFM infiltration calculations.
+- **Breaking change**: Replaces `SimulationControl/TemperatureCapacitanceMultiplier` with `SimulationControl/AdvancedResearchFeatures/TemperatureCapacitanceMultiplier`.
 - **Breaking change**: Replaces `BuildingSummary/Site/extension/GroundConductivity` with `BuildingSummary/Site/Soil/Conductivity`.
 - **Breaking change**: Modeling whole SFA/MF buildings is now specified using a `SoftwareInfo/extension/WholeSFAorMFBuildingSimulation=true` element instead of `building-id=ALL` argument.
 - **Breaking change**: Skylights attached to roofs of attics (e.g., with shafts or sun tunnels) must include the `Skylight/AttachedToFloor` element.
@@ -71,6 +72,8 @@ __New Features__
   - Other plug load schedules now use Other schedule fractions per ANSI/RESNET/ICC 301-2022 Addendum C.
   - TV plug load schedules now use TV schedule fractions from the American Time Use Survey and monthly multipliers from the 2010 Building America Analysis Spreadsheets.
   - Ceiling fan schedules now use ceiling fan schedule fractions and monthly multipliers from ANSI/RESNET/ICC 301-2022 Addendum C.
+- Advanced research features:
+  - Allows an optional boolean input `SimulationControl/AdvancedResearchFeatures/DefrostModelType` for heat pump advanced defrost model.
 
 __Bugfixes__
 - Fixes error if using AllowIncreasedFixedCapacities=true w/ HP detailed performance data.

HPXMLtoOpenStudio/measure.rb

@@ -1629,7 +1629,8 @@ def add_cooling_system(model, runner, weather, spaces, airloop_map)
 
         airloop_map[sys_id] = HVAC.apply_air_source_hvac_systems(model, runner, cooling_system, heating_system, sequential_cool_load_fracs, sequential_heat_load_fracs,
                                                                  weather.data.AnnualMaxDrybulb, weather.data.AnnualMinDrybulb,
-                                                                 conditioned_zone, @hvac_unavailable_periods, @schedules_file, @hpxml_bldg)
+                                                                 conditioned_zone, @hvac_unavailable_periods, @schedules_file, @hpxml_bldg,
+                                                                 spaces[HPXML::LocationConditionedSpace], @hpxml_header)
 
       elsif [HPXML::HVACTypeEvaporativeCooler].include? cooling_system.cooling_system_type
 
@@ -1674,7 +1675,8 @@ def add_heating_system(runner, model, weather, spaces, airloop_map)
 
         airloop_map[sys_id] = HVAC.apply_air_source_hvac_systems(model, runner, nil, heating_system, [0], sequential_heat_load_fracs,
                                                                  weather.data.AnnualMaxDrybulb, weather.data.AnnualMinDrybulb,
-                                                                 conditioned_zone, @hvac_unavailable_periods, @schedules_file, @hpxml_bldg)
+                                                                 conditioned_zone, @hvac_unavailable_periods, @schedules_file, @hpxml_bldg,
+                                                                 spaces[HPXML::LocationConditionedSpace], @hpxml_header)
 
       elsif [HPXML::HVACTypeBoiler].include? heating_system.heating_system_type
 
@@ -1737,7 +1739,8 @@ def add_heat_pump(runner, model, weather, spaces, airloop_map)
 
         airloop_map[sys_id] = HVAC.apply_air_source_hvac_systems(model, runner, heat_pump, heat_pump, sequential_cool_load_fracs, sequential_heat_load_fracs,
                                                                  weather.data.AnnualMaxDrybulb, weather.data.AnnualMinDrybulb,
-                                                                 conditioned_zone, @hvac_unavailable_periods, @schedules_file, @hpxml_bldg)
+                                                                 conditioned_zone, @hvac_unavailable_periods, @schedules_file, @hpxml_bldg,
+                                                                 spaces[HPXML::LocationConditionedSpace], @hpxml_header)
       elsif [HPXML::HVACTypeHeatPumpGroundToAir].include? heat_pump.heat_pump_type
 
         airloop_map[sys_id] = HVAC.apply_ground_to_air_heat_pump(model, runner, weather, heat_pump,

HPXMLtoOpenStudio/measure.xml

@@ -3,8 +3,8 @@
   <schema_version>3.1</schema_version>
   <name>hpxm_lto_openstudio</name>
   <uid>b1543b30-9465-45ff-ba04-1d1f85e763bc</uid>
-  <version_id>f36ca44a-aed9-492e-b937-3a607152cf54</version_id>
-  <version_modified>2024-05-17T19:57:43Z</version_modified>
+  <version_id>1177b622-bdc0-4783-8b3d-fda4f85ee78b</version_id>
+  <version_modified>2024-05-17T22:35:04Z</version_modified>
   <xml_checksum>D8922A73</xml_checksum>
   <class_name>HPXMLtoOpenStudio</class_name>
   <display_name>HPXML to OpenStudio Translator</display_name>
@@ -183,7 +183,7 @@
       <filename>measure.rb</filename>
       <filetype>rb</filetype>
       <usage_type>script</usage_type>
-      <checksum>59D5267D</checksum>
+      <checksum>43AEA737</checksum>
     </file>
     <file>
       <filename>airflow.rb</filename>
@@ -201,7 +201,7 @@
       <filename>constants.rb</filename>
       <filetype>rb</filetype>
       <usage_type>resource</usage_type>
-      <checksum>461EDD72</checksum>
+      <checksum>7B2EC023</checksum>
     </file>
     <file>
       <filename>constructions.rb</filename>
@@ -345,13 +345,13 @@
       <filename>hpxml.rb</filename>
       <filetype>rb</filetype>
       <usage_type>resource</usage_type>
-      <checksum>6812FFA1</checksum>
+      <checksum>65FDCD3D</checksum>
     </file>
     <file>
       <filename>hpxml_defaults.rb</filename>
       <filetype>rb</filetype>
       <usage_type>resource</usage_type>
-      <checksum>963F5566</checksum>
+      <checksum>3D14220A</checksum>
     </file>
     <file>
       <filename>hpxml_schema/HPXML.xsd</filename>
@@ -369,7 +369,7 @@
       <filename>hpxml_schematron/EPvalidator.xml</filename>
       <filetype>xml</filetype>
       <usage_type>resource</usage_type>
-      <checksum>A438D5D8</checksum>
+      <checksum>2FE01913</checksum>
     </file>
     <file>
       <filename>hpxml_schematron/iso-schematron.xsd</filename>
@@ -381,7 +381,7 @@
       <filename>hvac.rb</filename>
       <filetype>rb</filetype>
       <usage_type>resource</usage_type>
-      <checksum>5C9FA161</checksum>
+      <checksum>D2D922D4</checksum>
     </file>
     <file>
       <filename>hvac_sizing.rb</filename>
@@ -663,7 +663,7 @@
       <filename>test_hvac.rb</filename>
       <filetype>rb</filetype>
       <usage_type>test</usage_type>
-      <checksum>1F2A5548</checksum>
+      <checksum>8CDA3FA3</checksum>
     </file>
     <file>
       <filename>test_hvac_sizing.rb</filename>

HPXMLtoOpenStudio/resources/constants.rb

@@ -288,6 +288,10 @@ def self.ObjectNamePTAC
     return 'packaged terminal air conditioner'
   end
 
+  def self.ObjectNameBackupSuppHeat
+    return 'back up supp heat'
+  end
+
   def self.ObjectNameMiscGrill
     return 'misc grill'
   end

HPXMLtoOpenStudio/resources/hpxml.rb

@@ -57,6 +57,8 @@ class HPXML < Object
   # FUTURE: Move some of these to within child classes (e.g., HPXML::Attic class)
   AddressTypeMailing = 'mailing'
   AddressTypeStreet = 'street'
+  AdvancedResearchDefrostModelTypeStandard = 'standard'
+  AdvancedResearchDefrostModelTypeAdvanced = 'advanced'
   AirTypeFanCoil = 'fan coil'
   AirTypeGravity = 'gravity'
   AirTypeHighVelocity = 'high velocity'
@@ -775,7 +777,8 @@ def initialize(hpxml_object, *args, **kwargs)
              :software_program_version, :apply_ashrae140_assumptions, :temperature_capacitance_multiplier, :timestep,
              :sim_begin_month, :sim_begin_day, :sim_end_month, :sim_end_day, :sim_calendar_year,
              :eri_calculation_version, :co2index_calculation_version, :energystar_calculation_version,
-             :iecc_eri_calculation_version, :zerh_calculation_version, :whole_sfa_or_mf_building_sim]
+             :iecc_eri_calculation_version, :zerh_calculation_version, :whole_sfa_or_mf_building_sim,
+             :defrost_model_type]
     attr_accessor(*ATTRS)
     attr_reader(:emissions_scenarios)
     attr_reader(:utility_bill_scenarios)
@@ -835,7 +838,7 @@ def to_doc(doc)
         calculation = XMLHelper.add_element(extension, element_name)
         XMLHelper.add_element(calculation, 'Version', calculation_version, :string)
       end
-      if (not @timestep.nil?) || (not @sim_begin_month.nil?) || (not @sim_begin_day.nil?) || (not @sim_end_month.nil?) || (not @sim_end_day.nil?) || (not @temperature_capacitance_multiplier.nil?)
+      if (not @timestep.nil?) || (not @sim_begin_month.nil?) || (not @sim_begin_day.nil?) || (not @sim_end_month.nil?) || (not @sim_end_day.nil?) || (not @temperature_capacitance_multiplier.nil?) || (not @defrost_model_type.nil?)
         extension = XMLHelper.create_elements_as_needed(software_info, ['extension'])
         simulation_control = XMLHelper.add_element(extension, 'SimulationControl')
         XMLHelper.add_element(simulation_control, 'Timestep', @timestep, :integer, @timestep_isdefaulted) unless @timestep.nil?
@@ -844,7 +847,11 @@ def to_doc(doc)
         XMLHelper.add_element(simulation_control, 'EndMonth', @sim_end_month, :integer, @sim_end_month_isdefaulted) unless @sim_end_month.nil?
         XMLHelper.add_element(simulation_control, 'EndDayOfMonth', @sim_end_day, :integer, @sim_end_day_isdefaulted) unless @sim_end_day.nil?
         XMLHelper.add_element(simulation_control, 'CalendarYear', @sim_calendar_year, :integer, @sim_calendar_year_isdefaulted) unless @sim_calendar_year.nil?
-        XMLHelper.add_element(simulation_control, 'TemperatureCapacitanceMultiplier', @temperature_capacitance_multiplier, :float, @temperature_capacitance_multiplier_isdefaulted) unless @temperature_capacitance_multiplier.nil?
+        if (not @defrost_model_type.nil?) || (not @temperature_capacitance_multiplier.nil?)
+          advanced_research_features = XMLHelper.create_elements_as_needed(simulation_control, ['AdvancedResearchFeatures'])
+          XMLHelper.add_element(advanced_research_features, 'TemperatureCapacitanceMultiplier', @temperature_capacitance_multiplier, :float, @temperature_capacitance_multiplier_isdefaulted) unless @temperature_capacitance_multiplier.nil?
+          XMLHelper.add_element(advanced_research_features, 'DefrostModelType', @defrost_model_type, :string, @defrost_model_type_isdefaulted) unless @defrost_model_type.nil?
+        end
       end
       @emissions_scenarios.to_doc(software_info)
       @utility_bill_scenarios.to_doc(software_info)
@@ -871,7 +878,8 @@ def from_doc(hpxml)
       @sim_end_month = XMLHelper.get_value(hpxml, 'SoftwareInfo/extension/SimulationControl/EndMonth', :integer)
       @sim_end_day = XMLHelper.get_value(hpxml, 'SoftwareInfo/extension/SimulationControl/EndDayOfMonth', :integer)
       @sim_calendar_year = XMLHelper.get_value(hpxml, 'SoftwareInfo/extension/SimulationControl/CalendarYear', :integer)
-      @temperature_capacitance_multiplier = XMLHelper.get_value(hpxml, 'SoftwareInfo/extension/SimulationControl/TemperatureCapacitanceMultiplier', :float)
+      @temperature_capacitance_multiplier = XMLHelper.get_value(hpxml, 'SoftwareInfo/extension/SimulationControl/AdvancedResearchFeatures/TemperatureCapacitanceMultiplier', :float)
+      @defrost_model_type = XMLHelper.get_value(hpxml, 'SoftwareInfo/extension/SimulationControl/AdvancedResearchFeatures/DefrostModelType', :string)
       @apply_ashrae140_assumptions = XMLHelper.get_value(hpxml, 'SoftwareInfo/extension/ApplyASHRAE140Assumptions', :boolean)
       @whole_sfa_or_mf_building_sim = XMLHelper.get_value(hpxml, 'SoftwareInfo/extension/WholeSFAorMFBuildingSimulation', :boolean)
       @emissions_scenarios.from_doc(XMLHelper.get_element(hpxml, 'SoftwareInfo'))

HPXMLtoOpenStudio/resources/hpxml_defaults.rb

@@ -173,6 +173,11 @@ def self.apply_header(hpxml_header, epw_file)
       hpxml_header.temperature_capacitance_multiplier_isdefaulted = true
     end
 
+    if hpxml_header.defrost_model_type.nil?
+      hpxml_header.defrost_model_type = HPXML::AdvancedResearchDefrostModelTypeStandard
+      hpxml_header.defrost_model_type_isdefaulted = true
+    end
+
     hpxml_header.unavailable_periods.each do |unavailable_period|
       if unavailable_period.begin_hour.nil?
         unavailable_period.begin_hour = 0
@@ -1508,6 +1513,13 @@ def self.apply_hvac(runner, hpxml, hpxml_bldg, weather, convert_shared_systems)
       heat_pump.backup_heating_lockout_temp_isdefaulted = true
     end
 
+    # Default advanced defrost
+    hpxml_bldg.heat_pumps.each do |heat_pump|
+      next unless [HPXML::HVACTypeHeatPumpAirToAir, HPXML::HVACTypeHeatPumpMiniSplit, HPXML::HVACTypeHeatPumpRoom, HPXML::HVACTypeHeatPumpPTHP].include? heat_pump.heat_pump_type
+
+      heat_pump.backup_heating_lockout_temp_isdefaulted = true
+    end
+
     # Default electric resistance distribution
     hpxml_bldg.heating_systems.each do |heating_system|
       next unless heating_system.heating_system_type == HPXML::HVACTypeElectricResistance