HPWH capacity inputs

BuildResidentialHPXML/README.md

@@ -3795,7 +3795,7 @@ Ratio of energy delivered to water heater to the energy content of the fuel cons
 
 **Water Heater: Heating Capacity**
 
-Heating capacity. Only applies to storage water heater. If not provided, the OS-HPXML default (see <a href='https://openstudio-hpxml.readthedocs.io/en/v1.8.1/workflow_inputs.html#conventional-storage'>Conventional Storage</a>) is used.
+Heating capacity. Only applies to storage water heater and heat pump water heater (compressor). If not provided, the OS-HPXML default (see <a href='https://openstudio-hpxml.readthedocs.io/en/v1.8.1/workflow_inputs.html#conventional-storage'>Conventional Storage</a>, <a href='https://openstudio-hpxml.readthedocs.io/en/v1.8.1/workflow_inputs.html#heat-pump'>Heat Pump</a>) is used.
 
 - **Name:** ``water_heater_heating_capacity``
 - **Type:** ``Double``
@@ -3806,6 +3806,19 @@ Heating capacity. Only applies to storage water heater. If not provided, the OS-
 
 <br/>
 
+**Water Heater: Backup Heating Capacity**
+
+Backup heating capacity for a heat pump water heater. If not provided, the OS-HPXML default (see <a href='https://openstudio-hpxml.readthedocs.io/en/v1.8.1/workflow_inputs.html#heat-pump'>Heat Pump</a>) is used.
+
+- **Name:** ``water_heater_backup_heating_capacity``
+- **Type:** ``Double``
+
+- **Units:** ``Btu/hr``
+
+- **Required:** ``false``
+
+<br/>
+
 **Water Heater: Standby Loss**
 
 The standby loss of water heater. Only applies to space-heating boilers. If not provided, the OS-HPXML default (see <a href='https://openstudio-hpxml.readthedocs.io/en/v1.8.1/workflow_inputs.html#combi-boiler-w-storage'>Combi Boiler w/ Storage</a>) is used.

BuildResidentialHPXML/measure.rb

@@ -2273,7 +2273,13 @@ def arguments(model) # rubocop:disable Lint/UnusedMethodArgument
 
     arg = OpenStudio::Measure::OSArgument::makeDoubleArgument('water_heater_heating_capacity', false)
     arg.setDisplayName('Water Heater: Heating Capacity')
-    arg.setDescription("Heating capacity. Only applies to #{HPXML::WaterHeaterTypeStorage}. If not provided, the OS-HPXML default (see <a href='#{docs_base_url}#conventional-storage'>Conventional Storage</a>) is used.")
+    arg.setDescription("Heating capacity. Only applies to #{HPXML::WaterHeaterTypeStorage} and #{HPXML::WaterHeaterTypeHeatPump} (compressor). If not provided, the OS-HPXML default (see <a href='#{docs_base_url}#conventional-storage'>Conventional Storage</a>, <a href='#{docs_base_url}#heat-pump'>Heat Pump</a>) is used.")
+    arg.setUnits('Btu/hr')
+    args << arg
+
+    arg = OpenStudio::Measure::OSArgument::makeDoubleArgument('water_heater_backup_heating_capacity', false)
+    arg.setDisplayName('Water Heater: Backup Heating Capacity')
+    arg.setDescription("Backup heating capacity for a #{HPXML::WaterHeaterTypeHeatPump}. If not provided, the OS-HPXML default (see <a href='#{docs_base_url}#heat-pump'>Heat Pump</a>) is used.")
     arg.setUnits('Btu/hr')
     args << arg
 
@@ -6609,6 +6615,8 @@ def self.set_water_heating_systems(hpxml_bldg, args)
       heating_capacity = args[:water_heater_heating_capacity]
       tank_model_type = args[:water_heater_tank_model_type]
     elsif [HPXML::WaterHeaterTypeHeatPump].include? water_heater_type
+      heating_capacity = args[:water_heater_heating_capacity]
+      backup_heating_capacity = args[:water_heater_backup_heating_capacity]
       operating_mode = args[:water_heater_operating_mode]
     end
 
@@ -6629,6 +6637,7 @@ def self.set_water_heating_systems(hpxml_bldg, args)
                                          jacket_r_value: jacket_r_value,
                                          temperature: args[:water_heater_setpoint_temperature],
                                          heating_capacity: heating_capacity,
+                                         backup_heating_capacity: backup_heating_capacity,
                                          is_shared_system: is_shared_system,
                                          number_of_bedrooms_served: number_of_bedrooms_served,
                                          tank_model_type: tank_model_type,

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>2f4fbbe3-a36f-4d03-a5f5-87c150890550</version_id>
-  <version_modified>2024-10-13T19:48:25Z</version_modified>
+  <version_id>8dfdc271-772e-46a3-a611-71ca703a96c2</version_id>
+  <version_modified>2024-10-14T23:23:50Z</version_modified>
   <xml_checksum>2C38F48B</xml_checksum>
   <class_name>BuildResidentialHPXML</class_name>
   <display_name>HPXML Builder</display_name>
@@ -4696,7 +4696,16 @@
     <argument>
       <name>water_heater_heating_capacity</name>
       <display_name>Water Heater: Heating Capacity</display_name>
-      <description>Heating capacity. Only applies to storage water heater. If not provided, the OS-HPXML default (see &lt;a href='https://openstudio-hpxml.readthedocs.io/en/v1.8.1/workflow_inputs.html#conventional-storage'&gt;Conventional Storage&lt;/a&gt;) is used.</description>
+      <description>Heating capacity. Only applies to storage water heater and heat pump water heater (compressor). If not provided, the OS-HPXML default (see &lt;a href='https://openstudio-hpxml.readthedocs.io/en/v1.8.1/workflow_inputs.html#conventional-storage'&gt;Conventional Storage&lt;/a&gt;, &lt;a href='https://openstudio-hpxml.readthedocs.io/en/v1.8.1/workflow_inputs.html#heat-pump'&gt;Heat Pump&lt;/a&gt;) is used.</description>
+      <type>Double</type>
+      <units>Btu/hr</units>
+      <required>false</required>
+      <model_dependent>false</model_dependent>
+    </argument>
+    <argument>
+      <name>water_heater_backup_heating_capacity</name>
+      <display_name>Water Heater: Backup Heating Capacity</display_name>
+      <description>Backup heating capacity for a heat pump water heater. If not provided, the OS-HPXML default (see &lt;a href='https://openstudio-hpxml.readthedocs.io/en/v1.8.1/workflow_inputs.html#heat-pump'&gt;Heat Pump&lt;/a&gt;) is used.</description>
       <type>Double</type>
       <units>Btu/hr</units>
       <required>false</required>
@@ -7518,7 +7527,7 @@
       <filename>README.md</filename>
       <filetype>md</filetype>
       <usage_type>readme</usage_type>
-      <checksum>9F5858F9</checksum>
+      <checksum>25110074</checksum>
     </file>
     <file>
       <filename>README.md.erb</filename>
@@ -7535,7 +7544,7 @@
       <filename>measure.rb</filename>
       <filetype>rb</filetype>
       <usage_type>script</usage_type>
-      <checksum>C1F50EA1</checksum>
+      <checksum>F2C64E58</checksum>
     </file>
     <file>
       <filename>constants.rb</filename>

Changelog.md

@@ -3,7 +3,7 @@
 __New Features__
 - Updates to HPXML v4.0 final release.
 - Allows `Site/Address/ZipCode` to be provided instead of `ClimateandRiskZones/WeatherStation/extension/EPWFilePath`, in which case the closest TMY3 weather station will be automatically selected.
-- Adds inputs for modeling skylight curbs and/or shafts.
+- Allows optional inputs for modeling skylight curbs and/or shafts.
 - Allows modeling exterior horizontal insulation for a slab-on-grade foundation (or basement/crawlspace floor).
 - Allows alternative infiltration input `AirInfiltrationMeasurement/LeakinessDescription`, in which the infiltration level is estimated using age of home, climate zone, foundation type, etc.
 - Window shading enhancements:
@@ -15,6 +15,7 @@ __New Features__
   - Updates hot water usage based on FSEC study.
   - Updates misc/tv plug load usage based on RECS 2020 data.
   - Updates relationship between number of bedrooms and number of occupants to use RECS 2020 instead of RECS 2015.
+- Allows optional `HeatingCapacity` and `BackupHeatingCapacity` inputs for heat pump water heaters (HPWHs).
 - Central Fan Integrated Supply (CFIS) mechanical ventilation enhancements:
   - CFIS systems with no strategy to meet remainder of ventilation target (`CFISControls/AdditionalRuntimeOperatingMode="none"`).
 - HVAC Manual J design load and sizing calculations:

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>b5f6daaa-2d62-4c04-8442-5dd880a2a3eb</version_id>
-  <version_modified>2024-10-14T15:59:52Z</version_modified>
+  <version_id>52b3be7e-cd43-4986-b8af-2ccac939303f</version_id>
+  <version_modified>2024-10-14T23:36:58Z</version_modified>
   <xml_checksum>D8922A73</xml_checksum>
   <class_name>HPXMLtoOpenStudio</class_name>
   <display_name>HPXML to OpenStudio Translator</display_name>
@@ -327,7 +327,7 @@
       <filename>defaults.rb</filename>
       <filetype>rb</filetype>
       <usage_type>resource</usage_type>
-      <checksum>DF462CB6</checksum>
+      <checksum>DCE490C3</checksum>
     </file>
     <file>
       <filename>energyplus.rb</filename>
@@ -357,7 +357,7 @@
       <filename>hpxml.rb</filename>
       <filetype>rb</filetype>
       <usage_type>resource</usage_type>
-      <checksum>D8F0176E</checksum>
+      <checksum>F866C769</checksum>
     </file>
     <file>
       <filename>hpxml_schema/HPXML.xsd</filename>
@@ -375,7 +375,7 @@
       <filename>hpxml_schematron/EPvalidator.xml</filename>
       <filetype>xml</filetype>
       <usage_type>resource</usage_type>
-      <checksum>5238EC23</checksum>
+      <checksum>5AA8A4A1</checksum>
     </file>
     <file>
       <filename>hpxml_schematron/iso-schematron.xsd</filename>
@@ -603,7 +603,7 @@
       <filename>unit_conversions.rb</filename>
       <filetype>rb</filetype>
       <usage_type>resource</usage_type>
-      <checksum>1AB34E95</checksum>
+      <checksum>8BAAF04E</checksum>
     </file>
     <file>
       <filename>util.rb</filename>
@@ -627,7 +627,7 @@
       <filename>waterheater.rb</filename>
       <filetype>rb</filetype>
       <usage_type>resource</usage_type>
-      <checksum>EA8D60B3</checksum>
+      <checksum>6F8A18EC</checksum>
     </file>
     <file>
       <filename>weather.rb</filename>
@@ -663,7 +663,7 @@
       <filename>test_defaults.rb</filename>
       <filetype>rb</filetype>
       <usage_type>test</usage_type>
-      <checksum>05F155DA</checksum>
+      <checksum>9DD97EAF</checksum>
     </file>
     <file>
       <filename>test_enclosure.rb</filename>
@@ -741,7 +741,7 @@
       <filename>test_water_heater.rb</filename>
       <filetype>rb</filetype>
       <usage_type>test</usage_type>
-      <checksum>3F35600F</checksum>
+      <checksum>A293B678</checksum>
     </file>
     <file>
       <filename>test_weather.rb</filename>

HPXMLtoOpenStudio/resources/defaults.rb

@@ -2912,6 +2912,15 @@ def self.apply_water_heaters(hpxml_bldg, eri_version, schedules_file)
         end
       end
       if (water_heating_system.water_heater_type == HPXML::WaterHeaterTypeHeatPump)
+        Waterheater.set_heat_pump_cop(water_heating_system)
+        if water_heating_system.heating_capacity.nil?
+          water_heating_system.heating_capacity = (UnitConversions.convert(0.5, 'kW', 'Btu/hr') * water_heating_system.additional_properties.cop).round
+          water_heating_system.heating_capacity_isdefaulted = true
+        end
+        if water_heating_system.backup_heating_capacity.nil?
+          water_heating_system.backup_heating_capacity = UnitConversions.convert(4.5, 'kW', 'Btu/hr')
+          water_heating_system.backup_heating_capacity_isdefaulted = true
+        end
         if water_heating_system.tank_volume.nil?
           water_heating_system.tank_volume = get_water_heater_tank_volume(water_heating_system.fuel_type, nbeds, nbaths)
           water_heating_system.tank_volume_isdefaulted = true

HPXMLtoOpenStudio/resources/hpxml.rb

@@ -8374,6 +8374,7 @@ class WaterHeatingSystem < BaseElement
              :tank_volume,               # [Double] TankVolume (gal)
              :fraction_dhw_load_served,  # [Double] FractionDHWLoadServed (frac)
              :heating_capacity,          # [Double] HeatingCapacity (Btu/hr)
+             :backup_heating_capacity,   # [Double] BackupHeatingCapacity (Btu/hr)
              :energy_factor,             # [Double] EnergyFactor (frac)
              :uniform_energy_factor,     # [Double] UniformEnergyFactor (frac)
              :operating_mode,            # [String] HPWHOperatingMode (HPXML::WaterHeaterOperatingModeXXX)
@@ -8457,6 +8458,7 @@ def to_doc(building)
       XMLHelper.add_element(water_heating_system, 'TankVolume', @tank_volume, :float, @tank_volume_isdefaulted) unless @tank_volume.nil?
       XMLHelper.add_element(water_heating_system, 'FractionDHWLoadServed', @fraction_dhw_load_served, :float) unless @fraction_dhw_load_served.nil?
       XMLHelper.add_element(water_heating_system, 'HeatingCapacity', @heating_capacity, :float, @heating_capacity_isdefaulted) unless @heating_capacity.nil?
+      XMLHelper.add_element(water_heating_system, 'BackupHeatingCapacity', @backup_heating_capacity, :float, @backup_heating_capacity_isdefaulted) unless @backup_heating_capacity.nil?
       XMLHelper.add_element(water_heating_system, 'EnergyFactor', @energy_factor, :float, @energy_factor_isdefaulted) unless @energy_factor.nil?
       XMLHelper.add_element(water_heating_system, 'UniformEnergyFactor', @uniform_energy_factor, :float) unless @uniform_energy_factor.nil?
       XMLHelper.add_element(water_heating_system, 'HPWHOperatingMode', @operating_mode, :string, @operating_mode_isdefaulted) unless @operating_mode.nil?
@@ -8504,6 +8506,7 @@ def from_doc(water_heating_system)
       @tank_volume = XMLHelper.get_value(water_heating_system, 'TankVolume', :float)
       @fraction_dhw_load_served = XMLHelper.get_value(water_heating_system, 'FractionDHWLoadServed', :float)
       @heating_capacity = XMLHelper.get_value(water_heating_system, 'HeatingCapacity', :float)
+      @backup_heating_capacity = XMLHelper.get_value(water_heating_system, 'BackupHeatingCapacity', :float)
       @energy_factor = XMLHelper.get_value(water_heating_system, 'EnergyFactor', :float)
       @uniform_energy_factor = XMLHelper.get_value(water_heating_system, 'UniformEnergyFactor', :float)
       @operating_mode = XMLHelper.get_value(water_heating_system, 'HPWHOperatingMode', :string)

HPXMLtoOpenStudio/resources/hpxml_schematron/EPvalidator.xml

@@ -2206,6 +2206,8 @@
       <sch:assert role='ERROR' test='count(h:IsSharedSystem) &lt;= 1'>Expected 0 or 1 element(s) for xpath: IsSharedSystem</sch:assert> <!-- See [WaterHeatingSystem=Shared] -->
       <sch:assert role='ERROR' test='count(h:TankVolume) &lt;= 1'>Expected 0 or 1 element(s) for xpath: TankVolume</sch:assert>
       <sch:assert role='ERROR' test='count(h:FractionDHWLoadServed) = 1'>Expected 1 element(s) for xpath: FractionDHWLoadServed</sch:assert>
+      <sch:assert role='ERROR' test='count(h:HeatingCapacity) &lt;= 1'>Expected 0 or 1 element(s) for xpath: HeatingCapacity</sch:assert>
+      <sch:assert role='ERROR' test='count(h:BackupHeatingCapacity) &lt;= 1'>Expected 0 or 1 element(s) for xpath: BackupHeatingCapacity</sch:assert>
       <sch:assert role='ERROR' test='count(h:UniformEnergyFactor) + count(h:EnergyFactor) = 1'>Expected 1 element(s) for xpath: UniformEnergyFactor | EnergyFactor</sch:assert>
       <sch:assert role='ERROR' test='number(h:UniformEnergyFactor) &gt; 1 or not(h:UniformEnergyFactor)'>Expected UniformEnergyFactor to be greater than 1</sch:assert>
       <sch:assert role='ERROR' test='number(h:EnergyFactor) &gt; 1 or not(h:EnergyFactor)'>Expected EnergyFactor to be greater than 1</sch:assert>

HPXMLtoOpenStudio/resources/unit_conversions.rb

@@ -47,6 +47,7 @@ module UnitConversions
     ['ton', 'kbtu/hr'] => 12.0,
     ['ton', 'w'] => 3516.85284207,
     ['w', 'btu/hr'] => 3.412141633127942,
+    ['kw', 'btu/hr'] => 3412.141633127942,
     ['kbtu/hr', 'kw'] => 0.2930710701722222,
 
     # Power Flux