Room

What it is: Room Design Temperature

How to review: This value can be reviewed in the Room's properties in Floor Plan mode and for Custom Rooms also in the Heat Load Settings.

What it is: External Winter Temperature (Outside)

How to review: This value can be reviewed in the Wall / Door / Window / Skylight or Vaulted Ceiling's properties in Floor Plan mode and in General settings for Heat Load Settings.

What it is: Temperature of the Ground

How to review: This value can be reviewed in the Ground Floor Room's properties in the Floor Plan mode and in General settings for Heat Load Settings.

What it is: Bottom Floor, Suspended Floor or Party Floor

How to review: This can be reviewed in the Room's properties in the Floor Plan mode.

What it is: Material used for the Floor

How to review: This can be assigned in the Room's properties in the Floor Plan mode or in the Materials section under Material Assignments in the Heat Load Settings.

What it is: Thermal Conductivity of the Material used for the Floor.

How to review: This value can be reviewed in the Room's properties in the Floor Plan mode or in the Materials section in the Heat Load Settings.

What it is: Material used for the Roof / Vaulted Ceiling

How to review: This can be assigned in the Room's properties in the Floor Plan mode or in the Materials section under Material Assignments in the Heat Load Settings.

What it is: Thermal Conductivity of the Material used for the Roof / Vaulted Ceiling

How to review: This value can be reviewed in the Room's properties in the Floor Plan mode / Vaulted Ceiling's properties in the Floor Plan mode, or in the Materials section in the Heat Load Settings.

What it is: The total area of the Room, calculated as width multiplied by length.

How to review: This value can be reviewed and edited in the room's properties in Floor Plan Mode.

What it is: The total volume of the Room, calculated as the room area multiplied by its height.

How to review: The Height is set by default in Heat Load > Settings but can be overridden in the Room's properties in Floor Plan mode.

What it is: The air exchange rate per hour, taken from the Vent Air Changes Rate Standard in Methods.

How to review:

• The rate can be reviewed and overridden for individual rooms in the Ventilation tab of the room's properties.

What it is: The air exchange rate for heating purposes, taken from the Heating Air Changes Rate Standard in Methods.

How to review:

• The rate can be reviewed and overridden for specific rooms in the Ventilation tab of the room's properties.

What it is: A coefficient applied to account for additional heat transfer through thermal bridges, taken from Methods > General > Common.

How to review:

• Adjust this value for the entire project in Heat Load > General or override it in the room’s properties in Floor Plan Mode.

What it is: A percentage added to heat loss or heat gain to account for unknown factors, future considerations, or a conservative design.

How to review:

• Configure the spare capacity percentage in Heat Load > General or override it in the room’s properties in Floor Plan Mode.

What it is: The total heat loss in the room, calculated using material properties, ventilation, thermal bridging, and spare capacity.

What it is: Heat loss due to air changes, calculated based on the room volume and the difference between the internal and external temperatures.

Metric: Volume in m3\text{m}^3m3, ΔT in K\text{K}K, result in W\text{W}W.

Imperial: Volume in ft3\text{ft}^3ft3, ΔT in °F\text{°F}°F, result in BTU/h\text{BTU/h}BTU/h.

Verify the room volume and air change rate in the Ventilation tab of the room's properties.

Check the Room Temperature and External Winter Temperature in Heat Load > General.

What it is: A percentage of the material heat loss added to account for thermal bridging (e.g., 0.1 = 10%).

What it is: Additional heat loss added as a percentage of the calculated total.

What it is: The total heat gain in the room, considering materials, ventilation, internal sources, solar gain, and spare capacity.

What it is: Heat gain due to air changes, calculated based on the room volume and the difference between the internal and external temperatures.

Metric: Volume in m3\text{m}^3m3, ΔT in K\text{K}K, result in W\text{W}W.

Imperial: Volume in ft3\text{ft}^3ft3, ΔT in °F\text{°F}°F, result in BTU/h\text{BTU/h}BTU/h.

Verify the room volume and air change rate in the Ventilation tab of the room's properties.

Check the Room Temperature and External Summer Temperature in Heat Load > General.

What it is: A percentage of the material heat gain added to account for thermal bridging.

What it is: Heat generated by internal sources within the room.

Define internal heat sources in Heat Load > Internal Heat Sources.

Review and edit specific internal sources in the room's Internal Heat Sources tab in Floor Plan Mode.

What it is: Solar energy entering the room through windows, based on orientation and solar gain settings.

Check the solar gain coefficient in Methods > Solar Gain.

Verify the window orientation in the properties of the window in Floor Plan Mode.

What it is: Additional heat gain added as a percentage of the calculated total.

What It Is: The heat loss calculation is determined by the wall's area, U-value, and the temperature difference between the inside and outside.

Formula:

• Heat = Area × U-Value × ΔT

  • Heat: The heat loss (W in metric, BTU/h in imperial).

  • Area: The wall area (m² in metric, ft² in imperial).

  • U-Value: The thermal transmittance of the wall (W/m²·K in metric, BTU/h·ft²·°F in imperial).

  • ΔT: The temperature difference across the wall (°C in metric, °F in imperial).

How to Review:

• The wall area and U-value can be reviewed in the wall's properties.

• The External Winter Temperature is set in Heat Load > General and may be auto-filled based on the project address.

  • This can be overridden in the room’s properties in the Floor Plan Mode

• The room temperature can be overridden in the room’s properties in the FloInternal / External / Party Wallor Plan Mode

What It Is: The heat gain calculation is determined by the wall's area, U-value, and the temperature difference between the inside and outside.

Formula:

• Heat = Area × U-Value × ΔT

  • Heat: The heat gain (W in metric, BTU/h in imperial).

  • Area: The wall area (m² in metric, ft² in imperial).

  • U-Value: The thermal transmittance of the wall (W/m²·K in metric, BTU/h·ft²·°F in imperial).

  • ΔT: The temperature difference across the wall (°C in metric, °F in imperial).

How to Review:

• The wall area and U-value can be reviewed in the wall’s properties.

• The External Summer Temperature is set in Heat Load > General and may be auto-filled based on the project address.

  • This can be overridden in the room’s properties in the Floor Plan Mode

• The room temperature can be overridden in the room’s properties in the Floor Plan Mode

• To comprehensively review all wall-related heat load results, export the Heat Load Report, which consolidates all calculations in one centralized document.

What It Is: The heat loss calculation is determined by the door's area, U-value, and the temperature difference between the inside and outside.

Formula:

• Heat = Area × U-Value × ΔT

  • Heat: The heat loss (W in metric, BTU/h in imperial).

  • Area: The door area (m² in metric, ft² in imperial).

  • U-Value: The thermal transmittance of the door (W/m²·K in metric, BTU/h·ft²·°F in imperial).

  • ΔT: The temperature difference across the door (°C in metric, °F in imperial).

How to Review:

• The door area and U-value can be reviewed in the door's properties.

• The External Winter Temperature is set in Heat Load > General and may be auto-filled based on the project address.

  • This can be overridden in the room’s properties in the Floor Plan Mode

• The room temperature can be overridden in the room’s properties in the Floor Plan Mode

What It Is: The heat gain calculation is determined by the door's area, U-value, and the temperature difference between the inside and outside.

Formula:

• Heat = Area × U-Value × ΔT

  • Heat: The heat gain (W in metric, BTU/h in imperial).

  • Area: The door area (m² in metric, ft² in imperial).

  • U-Value: The thermal transmittance of the door (W/m²·K in metric, BTU/h·ft²·°F in imperial).

  • ΔT: The temperature difference across the door (°C in metric, °F in imperial).

How to Review:

• The door area and U-value can be reviewed in the door's properties.

• The External Summer Temperature is set in Heat Load > General and may be auto-filled based on the project address.

  • This can be overridden in the room’s properties in the Floor Plan Mode

• The room temperature can be overridden in the room’s properties in the Floor Plan Mode

• To comprehensively review all door-related heat load results, export the Heat Load Report, which consolidates all calculations in one centralized document.

What It Is: The heat loss calculation is determined by the floor's area, U-value, and the temperature difference between the inside and outside.

Formula:

• Heat = Area × U-Value × ΔT

  • Heat: The heat loss (W in metric, BTU/h in imperial).

  • Area: The floor area (m² in metric, ft² in imperial).

  • U-Value: The thermal transmittance of the floor (W/m²·K in metric, BTU/h·ft²·°F in imperial).

  • ΔT: The temperature difference across the floor (°C in metric, °F in imperial).

How to Review:

• The floor area can be reviewed in the Floor Plan Mode.

• The floor U-value can be reviewed in the floor's properties.

• The room temperature’s can be overridden in each of the room’s properties in the Floor Plan Mode

  • For ground levels, the Ground Temperature is set in Heat Load > General and may be auto-filled based on the project address.

    • This can be overridden in the room’s properties in the Floor Plan Mode

What It Is: The heat gain calculation is determined by the floor's area, U-value, and the temperature difference between the inside and outside.

Formula:

• Heat = Area × U-Value × ΔT

  • Heat: The heat gain (W in metric, BTU/h in imperial).

  • Area: The floor area (m² in metric, ft² in imperial).

  • U-Value: The thermal transmittance of the floor (W/m²·K in metric, BTU/h·ft²·°F in imperial).

  • ΔT: The temperature difference across the floor (°C in metric, °F in imperial).

How to Review:

• The floor area can be reviewed in the Floor Plan Mode.

• The floor U-value can be reviewed in the floor's properties.

• The room temperature’s can be overridden in each of the room’s properties in the Floor Plan Mode

  • For ground levels, the Ground Temperature is set in Heat Load > General and may be auto-filled based on the project address.

    • This can be overridden in the room’s properties in the Floor Plan Mode

What It Is: The heat loss calculation is determined by the roof/ceiling's area, U-value, and the temperature difference between the inside and outside.

Formula:

• Heat = Area × U-Value × ΔT

  • Heat: The heat loss (W in metric, BTU/h in imperial).

  • Area: The roof/ceiling area (m² in metric, ft² in imperial).

  • U-Value: The thermal transmittance of the roof/ceiling (W/m²·K in metric, BTU/h·ft²·°F in imperial).

  • ΔT: The temperature difference across the roof (°C in metric, °F in imperial).

How to Review:

• The roof/ceiling area can be reviewed in the Floor Plan Mode.

• The roof/ceiling U-value can be reviewed in the roof/ceiling’s properties.

• The External Winter Temperature is set in Heat Load > General and may be auto-filled based on the project address.

  • This can be overridden in the room’s properties in the Floor Plan Mode

• The room temperature can be overridden in the room’s properties in the Floor Plan Mode

What It Is: The heat gain calculation is determined by the roof/ceiling's area, U-value, and the temperature difference between the inside and outside.

Formula:

• Heat = Area × U-Value × ΔT

  • Heat: The heat gain (W in metric, BTU/h in imperial).

  • Area: The roof/ceiling area (m² in metric, ft² in imperial).

  • U-Value: The thermal transmittance of the roof/ceiling (W/m²·K in metric, BTU/h·ft²·°F in imperial).

  • ΔT: The temperature difference across the roof (°C in metric, °F in imperial).

How to Review:

• The roof/ceiling area can be reviewed in the Floor Plan Mode.

• The roof/ceiling U-value can be reviewed in the roof/ceiling's properties.

• The External Summer Temperature is set in Heat Load > General and may be auto-filled based on the project address.

  • This can be overridden in the room’s properties in the Floor Plan Mode

• The room temperature can be overridden in the room’s properties in the Floor Plan Mode

• To comprehensively review all roof/ceiling-related heat load results, export the Heat Load Report, which consolidates all calculations in one centralized document.

What it is: The actual surface temperature of the floor.

How it is calculated: It is an output based on the floor type, pipe size, delta T (difference between supply and return water temperature), and loop spacings.

How to review: Ensure these inputs are accurate in the System Settings and Room’s properties, where they may have been overridden.

What it is: The average temperature of the flow and return water in the loop.

How to review: These values are set in the ‘Technical’ tab of manifold 'properties under ‘UFH Flow Temperature’ and ‘UFH Return Temperature’.

What it is: The spacing between pipes in the loop, which influences the heat output and floor temperature.

How it is calculated: It is an output based on the floor type, pipe size, and delta T (difference between supply and return water temperature)

How to review: Ensure these inputs are accurate in the System Settings and Room’s properties, where they may have been overridden.

What it is: The heat output provided by the loop, determined by the floor type, pipe size, delta T, and loop spacings.

How it is calculated: It is an output based on the floor type, pipe size, and delta T (difference between supply and return water temperature).

How to review: Ensure these inputs are accurate in the System Settings and Room’s properties, where they may have been overridden.

What it is: A unique identifier for the loop, used for organization in schedules and reports.

How to review: This ID is auto-generated and displayed in schedules and reports.

What it is: The friction loss of water as it circulates through the loop. This is calculated using the Darcy-Weisbach equation.

ΔP = Pressure drop (Pa or psi)

f = Friction factor (dimensionless, depends on pipe roughness and Reynolds number)

L = Length of the pipe (m or ft)

D = Internal diameter of the pipe (m or ft)

ρ = Fluid density (kg/m³ or lb/ft³)

v = Fluid velocity (m/s or ft/s)

What it is: The total length of pipe in the loop, including the distance from the manifold to the room, including the vertical height between the manifold and the floor, and within the room itself.

How to review: Review the loop’s path, spacings, and height above floor in the ‘Inlets’ and ‘Outlets’ tabs of the manifold properties.

What it is: The total water volume in the loop, calculated as the pipe’s internal diameter multiplied by its length.

Heat Loss (Undiversified): The EN12831 calculation takes into account undiversified and diversified heat losses to come up with total values, unlike other traditional methods (CIBSE)

Heat Loss (Diversified): The EN12831 calculation takes into account undiversified and diversified heat losses to come up with total values, unlike other traditional methods (CIBSE)

Heat Loss Through Ventilation (Undiversified): The EN12831 calculation takes into account diversified & undiversified ventilation unlike other traditional methods (eg. CIBSE)

Heat Loss Through Ventilation (Diversified): The EN12831 calculation takes into account diversified & undiversified ventilation unlike other traditional methods (eg. CIBSE)

Fresh Air change rate of the room per hour: The EN12831 calculation takes into account diversity to calculate air changes, unlike other traditional methods (CIBSE)

Infiltration Air change rate of the room per hour: The EN12831 calculation takes into account diversity to calculate air changes, unlike other traditional methods (CIBSE)

Total Air change rate of the room per hour: The EN12831 calculation takes into account diversity to calculate air changes, unlike other traditional methods (CIBSE)

Room Envelope Area (A_env,i): This value corresponds to the Envelope area for room (i) (ie. A_env,i) which is a calculation component for EN12831.

Room ATD Design Air Flow (q_v,ATD,design,i): This value corresponds to the design air volume flow of the ATDs in the room (ie. q_v,ATD,design,i) which is a calculation component for EN12831.

Room Exhaust Flow Rate (q_v,exh,i): This value corresponds to the Exhaust air flow rate for space (i) (ie. q_v,exh,i) which is a calculation component for EN12831.

Room Supply Flow Rate (q_v,sup,i): This value corresponds to the Supply air flow rate for space (i) (ie. q_v,sup,i) which is a calculation component for EN12831.

Air Transfer (q_v,transfer,i): This value corresponds to a calculation requirement for EN123831

Room Combustion Air Flow (q_v,comb,i): This value corresponds to the Combustion air flow rate for space (i) (ie. q_v,comb,i) which is a calculation component for EN12831.

Room Technical Air Flow (q_v,techn,i): This value corresponds to the Technical air flow rate for space (i) (ie. q_v,techn,i) which is a calculation component for EN12831.

Room External Vent Flow (q_v,leak+ATD,i): This value corresponds to the external air volume flow into zone through ATDs (ie. q_v,leak+ATD,i) which is a calculation component for EN12831.

Room External Air Flow (q_v,env,i): This value corresponds to the Air flow rate due to envelope leakage for space (i) (ie. q_v,env,i) which is a calculation component for EN12831.

Room Min Fresh Air Flow (q_v,min,i): This value corresponds to the Minimum air flow rate required for space (i) (ie. q_v,min,i) which is a calculation component for EN12831.

Room Large Opening Flow (q_v,open,i): This value corresponds to the Air flow rate through openings in space (i) (ie. q_v,open,i) which is a calculation component for EN12831.

Room Ventilation Heat Loss (Φ_V,i): This value corresponds to the Ventilation heat loss for heated space (i) (ie. Φ_V,i) which is a calculation component for EN12831.

Room Ventilation Heat Gain (Φ_V,i): This value corresponds to the Ventilation heat loss for heated space (i) (ie. Φ_V,i) which is a calculation component for EN12831.

Room Vent Loss (diversified): This value corresponds to a calculation requirement for EN123831

Room Vent Gain (diversified): This value corresponds to a calculation requirement for EN123831

Zone Facades: This value corresponds to a calculation requirement for EN123831

Zone Facade Factor (f_fac,z): This value corresponds to the Adjustment factor for exposed facades (ie. ffac,z) which is a calculation component for EN12831.

Zone Envelope Area (A_env,z): This value corresponds to the Envelope area for zone (z) (ie. A_env,z) which is a calculation component for EN12831.

Zone Height Above Ground (h_g,z): This value corresponds to a calculation requirement for EN123831.

Zone Total Height (Delta h_z): This value corresponds to a calculation requirement for EN123831.

Zone ATD Design Flow (q_v,ATD,design,z): This value corresponds to the design air volume flow of the ATDs in the zone (ie. q_v,ATD,design,z) which is a calculation component for EN12831.

Zone Flow via ATDs (q_v,ATD,50,z): This value corresponds to the air flow into zone through ATDs at 50 Pa (ie. q_v,ATD,50,z) which is a calculation component for EN12831.

Zone ATD Authority (aATD,z): This value corresponds to the ATD authority of the ATDs in zone (ie. aATD,z) which is a calculation component for EN12831.

Zone Air Tightness (qenv,50): This value corresponds to the specific air permeability of envelope at 50 Pa (ie. qenv,50) which is a calculation component for EN12831.

Zone Leak Exponent (v,leak,z): This value corresponds to the exponent for leakages (ie. v,leak,z) which is a calculation component for EN12831.

Zone Design Press. Diff (Delta pATD,design,z): This value corresponds to the design pressure difference of the ATDs (ie. DeltapATD,design,z) which is a calculation component for EN12831.

Zone Orientation Factor (f_dir): This value corresponds to the Orientation factor (ie. f_dir) which is a calculation component for EN12831.

Zone Vol Flow Factor (f_qv,z): This value corresponds to the volume flow factor (ie. fqv,z) which is a calculation component for EN12831.

Zone Exhaust Flow Rate (q_v,exh,z): This value corresponds to the Exhaust air volume flow from zone (z) (ie. qv,exh,z) which is a calculation component for EN12831.

Zone Supply Flow Rate (q_v,sup,z): This value corresponds to the Supply air volume flow into zone (z) (ie. qv,sup,z) which is a calculation component for EN12831.

Zone Combustion Air Flow (q_v,comb,z): This value corresponds to the Combustion/technical air flow into zone (z) (ie. qv,comb,z) which is a calculation component for EN12831.

Zone Adjustment Fez (f_e,z): This value corresponds to a calculation requirement for EN123831

Zone Add. Infiltration (q_v,inf-add,z): This value corresponds to the Air flow through additional infiltration (ie. q_v,inf-add,z) which is a calculation component for EN12831.

Zone Flow via Envelope (q_v,env,z): This value corresponds to the External air volume flow through envelope (ie. q_v,env,z) which is a calculation component for EN12831.

Zone Ext. Air via Atd (qv,ATD,z): This value corresponds to the Air flow through air terminal devices for zone (ie. q_v,ATD,z) which is a calculation component for EN12831.

Zone Ext. Air via Leakage (q_v,leak,z): This value corresponds to the external air volume flow through leakages (ie. q_v,leak,z) which is a calculation component for EN12831.

Zone Large Openings Flow (q_v,open,z): This value corresponds to the External air volume flow through large openings (ie. q_v,open,z) which is a calculation component for EN12831.

Zone Ventilation Loss (Φ_V,z loss): This value corresponds to the Ventilation heat loss for zone (ie. Φ_V,z) which is a calculation component for EN12831.

Zone Ventilation Gain (Φ_V,z gain): This value corresponds to the Ventilation heat loss for zone (ie. Φ_V,z) which is a calculation component for EN12831.