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Advanced research feature: Blower off delay/latent degradation model #2182

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251b294
Initial cut at adding blower off delay/latent degradation model.
shorowit Mar 24, 2026
2562fa3
Fix CI (whole SFA/MF buildings)
shorowit Mar 25, 2026
f52fc86
Remove continuous fan mode.
shorowit Mar 25, 2026
b18f26f
Incorporate unit multiplier
shorowit Mar 25, 2026
07f7d6b
Latest results.
Mar 25, 2026
176428e
Fix copy/paste issue [ci skip]
shorowit Mar 26, 2026
496c8db
Replace 400 with RatedCFMPerTon [ci skip]
shorowit Mar 26, 2026
aafa292
Merge branch 'master' of https://github.com/NatLabRockies/OpenStudio-…
shorowit Mar 26, 2026
f5de21c
Move actual cfm/ton values to HVAC constants. Small fix to fan coil a…
shorowit Mar 26, 2026
8949e55
Latest results.
Mar 26, 2026
24da7fd
Add mech vent to our dehumidifier files and move them to Houston.
shorowit Mar 30, 2026
2029d99
Latest results.
Mar 30, 2026
11a6fda
Refactor inputs, update docs and sample files.
shorowit Apr 1, 2026
1cda58c
Bugfixes, cleanup.
shorowit Apr 1, 2026
3e263f6
Latest results.
Apr 1, 2026
261b054
Added comments to the blower off delay program to clarify equations b…
jonwinkler Apr 7, 2026
9fe269c
Merge branch 'master' of https://github.com/NatLabRockies/OpenStudio-…
shorowit Apr 13, 2026
954ed06
Update Changelog.md
shorowit Apr 13, 2026
9886e70
Clean up documentation; clarify it applies to cooling. [ci skip]
shorowit Apr 13, 2026
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4 changes: 2 additions & 2 deletions BuildResidentialHPXML/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1726,7 +1726,7 @@ Select an advanced research feature to use in the model, if desired.

- **Required:** ``false``

- **Choices:** <br/> - `None`<br/> - `Temperature Capacitance Multiplier, 1`<br/> - `Temperature Capacitance Multiplier, 4`<br/> - `Temperature Capacitance Multiplier, 10`<br/> - `Temperature Capacitance Multiplier, 15`<br/> - `On/Off Thermostat Deadband, 1F`<br/> - `On/Off Thermostat Deadband, 2F`<br/> - `On/Off Thermostat Deadband, 3F`<br/> - `Heat Pump Backup Staging, 5 kW`<br/> - `Heat Pump Backup Staging, 10 kW`<br/> - `Experimental Ground-to-Air Heat Pump Model`<br/> - `HVAC Allow Increased Fixed Capacities`
- **Choices:** <br/> - `None`<br/> - `Temperature Capacitance Multiplier, 1`<br/> - `Temperature Capacitance Multiplier, 4`<br/> - `Temperature Capacitance Multiplier, 10`<br/> - `Temperature Capacitance Multiplier, 15`<br/> - `On/Off Thermostat Deadband, 1F`<br/> - `On/Off Thermostat Deadband, 2F`<br/> - `On/Off Thermostat Deadband, 3F`<br/> - `HVAC Blower-Off Delay, 0 sec`<br/> - `HVAC Blower-Off Delay, 45 sec`<br/> - `HVAC Blower-Off Delay, 90 sec`<br/> - `Heat Pump Backup Staging, 5 kW`<br/> - `Heat Pump Backup Staging, 10 kW`<br/> - `Experimental Ground-to-Air Heat Pump Model`<br/> - `HVAC Allow Increased Fixed Capacities`


- **Default:** `None`
Expand All @@ -1741,7 +1741,7 @@ Select a second advanced research feature to use in the model, if desired.

- **Required:** ``false``

- **Choices:** <br/> - `None`<br/> - `Temperature Capacitance Multiplier, 1`<br/> - `Temperature Capacitance Multiplier, 4`<br/> - `Temperature Capacitance Multiplier, 10`<br/> - `Temperature Capacitance Multiplier, 15`<br/> - `On/Off Thermostat Deadband, 1F`<br/> - `On/Off Thermostat Deadband, 2F`<br/> - `On/Off Thermostat Deadband, 3F`<br/> - `Heat Pump Backup Staging, 5 kW`<br/> - `Heat Pump Backup Staging, 10 kW`<br/> - `Experimental Ground-to-Air Heat Pump Model`<br/> - `HVAC Allow Increased Fixed Capacities`
- **Choices:** <br/> - `None`<br/> - `Temperature Capacitance Multiplier, 1`<br/> - `Temperature Capacitance Multiplier, 4`<br/> - `Temperature Capacitance Multiplier, 10`<br/> - `Temperature Capacitance Multiplier, 15`<br/> - `On/Off Thermostat Deadband, 1F`<br/> - `On/Off Thermostat Deadband, 2F`<br/> - `On/Off Thermostat Deadband, 3F`<br/> - `HVAC Blower-Off Delay, 0 sec`<br/> - `HVAC Blower-Off Delay, 45 sec`<br/> - `HVAC Blower-Off Delay, 90 sec`<br/> - `Heat Pump Backup Staging, 5 kW`<br/> - `Heat Pump Backup Staging, 10 kW`<br/> - `Experimental Ground-to-Air Heat Pump Model`<br/> - `HVAC Allow Increased Fixed Capacities`


- **Default:** `None`
Expand Down
9 changes: 9 additions & 0 deletions BuildResidentialHPXML/measure.rb
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -1337,6 +1337,15 @@ def set_header(runner, hpxml, args)
hpxml.header.hvac_onoff_thermostat_deadband = onoff_db
end

hvac_bod = args[:advanced_feature_hvac_blower_off_delay]
hvac_bod = args[:advanced_feature_2_hvac_blower_off_delay] if hvac_bod.nil?
if not hvac_bod.nil?
if (not hpxml.header.hvac_blower_off_delay.nil?) && (hpxml.header.hvac_blower_off_delay != hvac_bod)
errors << "Advanced feature 'HVAC Blower-Off Delay' cannot vary across dwelling units."
end
hpxml.header.hvac_blower_off_delay = hvac_bod
end

hpbak = args[:advanced_feature_heat_pump_backup_capacity_increment]
hpbak = args[:advanced_feature_2_heat_pump_backup_capacity_increment] if hpbak.nil?
if not hpbak.nil?
Expand Down
36 changes: 30 additions & 6 deletions BuildResidentialHPXML/measure.xml
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3,8 +3,8 @@
<schema_version>3.1</schema_version>
<name>build_residential_hpxml</name>
<uid>a13a8983-2b01-4930-8af2-42030b6e4233</uid>
<version_id>7f9047dc-ce5b-4136-8c94-ff0da759787d</version_id>
<version_modified>2026-03-05T18:36:40Z</version_modified>
<version_id>101eed5f-e509-4045-885c-7ade15315a9f</version_id>
<version_modified>2026-03-24T23:23:01Z</version_modified>
<xml_checksum>2C38F48B</xml_checksum>
<class_name>BuildResidentialHPXML</class_name>
<display_name>HPXML Builder</display_name>
Expand Down Expand Up @@ -11081,6 +11081,18 @@
<value>On/Off Thermostat Deadband, 3F</value>
<display_name>On/Off Thermostat Deadband, 3F</display_name>
</choice>
<choice>
<value>HVAC Blower-Off Delay, 0 sec</value>
<display_name>HVAC Blower-Off Delay, 0 sec</display_name>
</choice>
<choice>
<value>HVAC Blower-Off Delay, 45 sec</value>
<display_name>HVAC Blower-Off Delay, 45 sec</display_name>
</choice>
<choice>
<value>HVAC Blower-Off Delay, 90 sec</value>
<display_name>HVAC Blower-Off Delay, 90 sec</display_name>
</choice>
<choice>
<value>Heat Pump Backup Staging, 5 kW</value>
<display_name>Heat Pump Backup Staging, 5 kW</display_name>
Expand Down Expand Up @@ -11140,6 +11152,18 @@
<value>On/Off Thermostat Deadband, 3F</value>
<display_name>On/Off Thermostat Deadband, 3F</display_name>
</choice>
<choice>
<value>HVAC Blower-Off Delay, 0 sec</value>
<display_name>HVAC Blower-Off Delay, 0 sec</display_name>
</choice>
<choice>
<value>HVAC Blower-Off Delay, 45 sec</value>
<display_name>HVAC Blower-Off Delay, 45 sec</display_name>
</choice>
<choice>
<value>HVAC Blower-Off Delay, 90 sec</value>
<display_name>HVAC Blower-Off Delay, 90 sec</display_name>
</choice>
<choice>
<value>Heat Pump Backup Staging, 5 kW</value>
<display_name>Heat Pump Backup Staging, 5 kW</display_name>
Expand Down Expand Up @@ -11413,7 +11437,7 @@
<filename>README.md</filename>
<filetype>md</filetype>
<usage_type>readme</usage_type>
<checksum>75446FA4</checksum>
<checksum>183A6ECC</checksum>
</file>
<file>
<filename>README.md.erb</filename>
Expand All @@ -11430,7 +11454,7 @@
<filename>measure.rb</filename>
<filetype>rb</filetype>
<usage_type>script</usage_type>
<checksum>5A12D243</checksum>
<checksum>91723BAC</checksum>
</file>
<file>
<filename>constants.rb</filename>
Expand All @@ -11448,13 +11472,13 @@
<filename>options/advanced_feature.tsv</filename>
<filetype>tsv</filetype>
<usage_type>resource</usage_type>
<checksum>E5849695</checksum>
<checksum>9A5E0F2C</checksum>
</file>
<file>
<filename>options/advanced_feature_2.tsv</filename>
<filetype>tsv</filetype>
<usage_type>resource</usage_type>
<checksum>E5849695</checksum>
<checksum>9A5E0F2C</checksum>
</file>
<file>
<filename>options/appliance_clothes_dryer.tsv</filename>
Expand Down
42 changes: 23 additions & 19 deletions BuildResidentialHPXML/resources/options/advanced_feature.tsv
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Original file line number Diff line number Diff line change
@@ -1,19 +1,23 @@
Option Name Temperature Capacitance Multiplier HVAC On-Off Thermostat Deadband Temperature [F] Heat Pump Backup Capacity Increment [Btu/hr] Ground-to-Air Heat Pump Model Type HVAC Allow Increased Fixed Capacities
None
"Temperature Capacitance Multiplier, 1" 1
"Temperature Capacitance Multiplier, 4" 4
"Temperature Capacitance Multiplier, 10" 10
"Temperature Capacitance Multiplier, 15" 15
"On/Off Thermostat Deadband, 1F" 1
"On/Off Thermostat Deadband, 2F" 2
"On/Off Thermostat Deadband, 3F" 3
"Heat Pump Backup Staging, 5 kW" 17060.71
"Heat Pump Backup Staging, 10 kW" 34121.42
Experimental Ground-to-Air Heat Pump Model experimental
HVAC Allow Increased Fixed Capacities TRUE

# Temperature Capacitance Multiplier: Multiplier on air heat capacitance. Affects the transient calculation of indoor air temperatures. Values greater than 1.0 have the effect of smoothing or damping the rate of change in the indoor air temperature from timestep to timestep.
# HVAC On-Off Thermostat Deadband Temperature: Temperature difference between cut-in and cut-out temperature for HVAC operation. Requires 1-minute timesteps.
# Heat Pump Backup Capacity Increment: Capacity increment of multi-stage heat pump backup systems.
# Ground-to-Air Heat Pump Model Type: Ground-to-air heat pump system model type.
"# HVAC Allow Increased Fixed Capacities: If true, the larger of user-specified fixed capacity and design load will be used (to reduce potential for unmet loads); otherwise user-specified fixed capacity is used."
Option Name Temperature Capacitance Multiplier HVAC On-Off Thermostat Deadband Temperature [F] HVAC Blower-Off Delay [sec] Heat Pump Backup Capacity Increment [Btu/hr] Ground-to-Air Heat Pump Model Type HVAC Allow Increased Fixed Capacities
None
"Temperature Capacitance Multiplier, 1" 1
"Temperature Capacitance Multiplier, 4" 4
"Temperature Capacitance Multiplier, 10" 10
"Temperature Capacitance Multiplier, 15" 15
"On/Off Thermostat Deadband, 1F" 1
"On/Off Thermostat Deadband, 2F" 2
"On/Off Thermostat Deadband, 3F" 3
"HVAC Blower-Off Delay, 0 sec" 0
"HVAC Blower-Off Delay, 45 sec" 45
"HVAC Blower-Off Delay, 90 sec" 90
"Heat Pump Backup Staging, 5 kW" 17060.71
"Heat Pump Backup Staging, 10 kW" 34121.42
Experimental Ground-to-Air Heat Pump Model experimental
HVAC Allow Increased Fixed Capacities TRUE

# Temperature Capacitance Multiplier: Multiplier on air heat capacitance. Affects the transient calculation of indoor air temperatures. Values greater than 1.0 have the effect of smoothing or damping the rate of change in the indoor air temperature from timestep to timestep.
# HVAC On-Off Thermostat Deadband Temperature: Temperature difference between cut-in and cut-out temperature for HVAC operation. Requires 1-minute timesteps.
# HVAC Blower-Off Delay: Time that the HVAC fan runs after the end of a cooling cycle. This increases the overall efficiency of the cooling system but also introduces humidity back into the home.
# Heat Pump Backup Capacity Increment: Capacity increment of multi-stage heat pump backup systems.
# Ground-to-Air Heat Pump Model Type: Ground-to-air heat pump system model type.
"# HVAC Allow Increased Fixed Capacities: If true, the larger of user-specified fixed capacity and design load will be used (to reduce potential for unmet loads); otherwise user-specified fixed capacity is used."
42 changes: 23 additions & 19 deletions BuildResidentialHPXML/resources/options/advanced_feature_2.tsv
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,19 +1,23 @@
Option Name Temperature Capacitance Multiplier HVAC On-Off Thermostat Deadband Temperature [F] Heat Pump Backup Capacity Increment [Btu/hr] Ground-to-Air Heat Pump Model Type HVAC Allow Increased Fixed Capacities
None
"Temperature Capacitance Multiplier, 1" 1
"Temperature Capacitance Multiplier, 4" 4
"Temperature Capacitance Multiplier, 10" 10
"Temperature Capacitance Multiplier, 15" 15
"On/Off Thermostat Deadband, 1F" 1
"On/Off Thermostat Deadband, 2F" 2
"On/Off Thermostat Deadband, 3F" 3
"Heat Pump Backup Staging, 5 kW" 17060.71
"Heat Pump Backup Staging, 10 kW" 34121.42
Experimental Ground-to-Air Heat Pump Model experimental
HVAC Allow Increased Fixed Capacities TRUE

# Temperature Capacitance Multiplier: Multiplier on air heat capacitance. Affects the transient calculation of indoor air temperatures. Values greater than 1.0 have the effect of smoothing or damping the rate of change in the indoor air temperature from timestep to timestep.
# HVAC On-Off Thermostat Deadband Temperature: Temperature difference between cut-in and cut-out temperature for HVAC operation. Requires 1-minute timesteps.
# Heat Pump Backup Capacity Increment: Capacity increment of multi-stage heat pump backup systems.
# Ground-to-Air Heat Pump Model Type: Ground-to-air heat pump system model type.
"# HVAC Allow Increased Fixed Capacities: If true, the larger of user-specified fixed capacity and design load will be used (to reduce potential for unmet loads); otherwise user-specified fixed capacity is used."
Option Name Temperature Capacitance Multiplier HVAC On-Off Thermostat Deadband Temperature [F] HVAC Blower-Off Delay [sec] Heat Pump Backup Capacity Increment [Btu/hr] Ground-to-Air Heat Pump Model Type HVAC Allow Increased Fixed Capacities
None
"Temperature Capacitance Multiplier, 1" 1
"Temperature Capacitance Multiplier, 4" 4
"Temperature Capacitance Multiplier, 10" 10
"Temperature Capacitance Multiplier, 15" 15
"On/Off Thermostat Deadband, 1F" 1
"On/Off Thermostat Deadband, 2F" 2
"On/Off Thermostat Deadband, 3F" 3
"HVAC Blower-Off Delay, 0 sec" 0
"HVAC Blower-Off Delay, 45 sec" 45
"HVAC Blower-Off Delay, 90 sec" 90
"Heat Pump Backup Staging, 5 kW" 17060.71
"Heat Pump Backup Staging, 10 kW" 34121.42
Experimental Ground-to-Air Heat Pump Model experimental
HVAC Allow Increased Fixed Capacities TRUE

# Temperature Capacitance Multiplier: Multiplier on air heat capacitance. Affects the transient calculation of indoor air temperatures. Values greater than 1.0 have the effect of smoothing or damping the rate of change in the indoor air temperature from timestep to timestep.
# HVAC On-Off Thermostat Deadband Temperature: Temperature difference between cut-in and cut-out temperature for HVAC operation. Requires 1-minute timesteps.
# HVAC Blower-Off Delay: Time that the HVAC fan runs after the end of a cooling cycle. This increases the overall efficiency of the cooling system but also introduces humidity back into the home.
# Heat Pump Backup Capacity Increment: Capacity increment of multi-stage heat pump backup systems.
# Ground-to-Air Heat Pump Model Type: Ground-to-air heat pump system model type.
"# HVAC Allow Increased Fixed Capacities: If true, the larger of user-specified fixed capacity and design load will be used (to reduce potential for unmet loads); otherwise user-specified fixed capacity is used."
26 changes: 13 additions & 13 deletions HPXMLtoOpenStudio/measure.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -3,8 +3,8 @@
<schema_version>3.1</schema_version>
<name>hpxm_lto_openstudio</name>
<uid>b1543b30-9465-45ff-ba04-1d1f85e763bc</uid>
<version_id>353e5b26-f5f2-414d-a19a-1168231bf5d5</version_id>
<version_modified>2026-03-23T19:27:49Z</version_modified>
<version_id>603cf44b-8ad5-4589-9645-de85f8739713</version_id>
<version_modified>2026-03-25T19:54:09Z</version_modified>
<xml_checksum>D8922A73</xml_checksum>
<class_name>HPXMLtoOpenStudio</class_name>
<display_name>HPXML to OpenStudio Translator</display_name>
Expand Down Expand Up @@ -217,13 +217,13 @@
<filename>airflow.rb</filename>
<filetype>rb</filetype>
<usage_type>resource</usage_type>
<checksum>2F17E22A</checksum>
<checksum>08A1E217</checksum>
</file>
<file>
<filename>battery.rb</filename>
<filetype>rb</filetype>
<usage_type>resource</usage_type>
<checksum>E058674B</checksum>
<checksum>E49D3A84</checksum>
</file>
<file>
<filename>calendar.rb</filename>
Expand All @@ -235,7 +235,7 @@
<filename>constants.rb</filename>
<filetype>rb</filetype>
<usage_type>resource</usage_type>
<checksum>6430B8D3</checksum>
<checksum>5EF534B8</checksum>
</file>
<file>
<filename>constructions.rb</filename>
Expand Down Expand Up @@ -403,7 +403,7 @@
<filename>hpxml.rb</filename>
<filetype>rb</filetype>
<usage_type>resource</usage_type>
<checksum>E69EEA14</checksum>
<checksum>7B02F947</checksum>
</file>
<file>
<filename>hpxml_schema/HPXML.xsd</filename>
Expand All @@ -421,7 +421,7 @@
<filename>hpxml_schematron/EPvalidator.sch</filename>
<filetype>sch</filetype>
<usage_type>resource</usage_type>
<checksum>9B5934A8</checksum>
<checksum>D8EAEEA0</checksum>
</file>
<file>
<filename>hpxml_schematron/iso-schematron.xsd</filename>
Expand All @@ -433,7 +433,7 @@
<filename>hvac.rb</filename>
<filetype>rb</filetype>
<usage_type>resource</usage_type>
<checksum>86BE60D7</checksum>
<checksum>98382512</checksum>
</file>
<file>
<filename>hvac_sizing.rb</filename>
Expand All @@ -445,7 +445,7 @@
<filename>internal_gains.rb</filename>
<filetype>rb</filetype>
<usage_type>resource</usage_type>
<checksum>D8FFFC3A</checksum>
<checksum>CD7FA760</checksum>
</file>
<file>
<filename>lighting.rb</filename>
Expand Down Expand Up @@ -493,13 +493,13 @@
<filename>model.rb</filename>
<filetype>rb</filetype>
<usage_type>resource</usage_type>
<checksum>A41E8C73</checksum>
<checksum>E80D049D</checksum>
</file>
<file>
<filename>output.rb</filename>
<filetype>rb</filetype>
<usage_type>resource</usage_type>
<checksum>7F8E008D</checksum>
<checksum>4F98F5CE</checksum>
</file>
<file>
<filename>psychrometrics.rb</filename>
Expand Down Expand Up @@ -715,7 +715,7 @@
<filename>waterheater.rb</filename>
<filetype>rb</filetype>
<usage_type>resource</usage_type>
<checksum>F6FDFDBD</checksum>
<checksum>99184866</checksum>
</file>
<file>
<filename>weather.rb</filename>
Expand Down Expand Up @@ -829,7 +829,7 @@
<filename>test_validation.rb</filename>
<filetype>rb</filetype>
<usage_type>test</usage_type>
<checksum>5146716A</checksum>
<checksum>159BD29C</checksum>
</file>
<file>
<filename>test_vehicle.rb</filename>
Expand Down
15 changes: 3 additions & 12 deletions HPXMLtoOpenStudio/resources/airflow.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -474,7 +474,6 @@ def self.apply_natural_ventilation_and_whole_house_fan(runner, model, spaces, hp
name: Constants::ObjectTypeWholeHouseFan,
end_use: Constants::ObjectTypeWholeHouseFan,
space: conditioned_space, # no heat gain, so assign the equipment to an arbitrary space
design_level: nil, # will be EMS-actuated
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@shorowit shorowit Apr 13, 2026

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Just some unrelated cleanup throughout to avoid having to pass a bunch of nil values to Model.add_electric_equipment and Model.add_other_equipment.

frac_radiant: 0,
frac_latent: 0,
frac_lost: 1,
Expand Down Expand Up @@ -1321,12 +1320,10 @@ def self.apply_ducts_for_distribution_system_location(model, spaces, hpxml_bldg,
name: object_name,
end_use: end_use,
space: space,
design_level: nil,
frac_radiant: 0,
frac_latent: frac_lat,
frac_lost: frac_lost,
schedule: model.alwaysOnDiscreteSchedule,
fuel_type: nil
schedule: model.alwaysOnDiscreteSchedule
)

duct_actuators[var_name] = Model.add_ems_actuator(
Expand Down Expand Up @@ -2241,12 +2238,10 @@ def self.initialize_mech_vent(model, spaces, infil_program, sensors)
name: "#{Constants::ObjectTypeMechanicalVentilationHouseFan} sensible load",
end_use: Constants::ObjectTypeMechanicalVentilationHouseFan,
space: conditioned_space,
design_level: nil,
frac_radiant: 0,
frac_latent: 0,
frac_lost: 0,
schedule: model.alwaysOnDiscreteSchedule,
fuel_type: nil
schedule: model.alwaysOnDiscreteSchedule
)

fan_sens_load_actuator = Model.add_ems_actuator(
Expand All @@ -2260,12 +2255,10 @@ def self.initialize_mech_vent(model, spaces, infil_program, sensors)
name: "#{Constants::ObjectTypeMechanicalVentilationHouseFan} latent load",
end_use: Constants::ObjectTypeMechanicalVentilationHouseFan,
space: conditioned_space,
design_level: nil,
frac_radiant: 0,
frac_latent: 1,
frac_lost: 0,
schedule: model.alwaysOnDiscreteSchedule,
fuel_type: nil
schedule: model.alwaysOnDiscreteSchedule
)

fan_lat_load_actuator = Model.add_ems_actuator(
Expand Down Expand Up @@ -2555,7 +2548,6 @@ def self.calculate_precond_loads(model, spaces, infil_program, vent_fans, hrv_er
name: "shared mech vent preheating energy #{i}",
end_use: "#{Constants::ObjectTypeMechanicalVentilationPreheating}#{cnt + 1}",
space: conditioned_space,
design_level: nil,
frac_radiant: 0,
frac_latent: 0,
frac_lost: 1,
Expand Down Expand Up @@ -2600,7 +2592,6 @@ def self.calculate_precond_loads(model, spaces, infil_program, vent_fans, hrv_er
name: "shared mech vent precooling energy #{i}",
end_use: "#{Constants::ObjectTypeMechanicalVentilationPrecooling}#{cnt + 1}",
space: conditioned_space,
design_level: nil,
frac_radiant: 0,
frac_latent: 0,
frac_lost: 1,
Expand Down
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