Room

Overview

The Room results provide essential data for heat load and heat gain calculations, including ventilation, thermal bridging, and material properties. These values can be reviewed and edited in the Floor Plan Mode or specific sections of the Heat Load Settings.

Below is a detailed explanation of each result and how to manage it.


Room Area

  • 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.


Room Volume

  • 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.


Ventilation Air Change Rate

  • 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.


Heating Air Change Rate

  • 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.


Thermal Bridging Coefficient

  • 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.


Spare Capacity

  • 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.


Heat Loss

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

Formula:

Heat Loss=Material Heat Loss+Ventilation Heat Loss+Thermal Bridging Loss+Spare Loss\text{Heat Loss} = \text{Material Heat Loss} + \text{Ventilation Heat Loss} + \text{Thermal Bridging Loss} + \text{Spare Loss}Heat Loss=Material Heat Loss+Ventilation Heat Loss+Thermal Bridging Loss+Spare Loss


Heat Loss Through Ventilation

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

Formula:

Heat Loss=Room Volume×Air Changes×ΔT\text{Heat Loss} = \text{Room Volume} \times \text{Air Changes} \times \Delta THeat Loss=Room Volume×Air Changes×ΔT

Units:

  • 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.

How to review:

  • 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.


Heat Loss Through Thermal Bridging

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

How to review: Adjust the thermal bridging coefficient in Heat Load > General or override it in the room’s properties.


Heat Loss Through Spare Loss

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

How to review: Configure the spare loss percentage in Heat Load > General or override it in the room’s properties.


Heat Gain

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

Formula:

Heat Gain=Material Heat Gain+Ventilation Heat Gain+Internal Sources+Solar Gain+Spare Gain\text{Heat Gain} = \text{Material Heat Gain} + \text{Ventilation Heat Gain} + \text{Internal Sources} + \text{Solar Gain} + \text{Spare Gain}Heat Gain=Material Heat Gain+Ventilation Heat Gain+Internal Sources+Solar Gain+Spare Gain


Heat Gain Through Ventilation

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

Formula:

Heat Gain=Room Volume×Air Changes×ΔT\text{Heat Gain} = \text{Room Volume} \times \text{Air Changes} \times \Delta THeat Gain=Room Volume×Air Changes×ΔT

Units:

  • 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.

How to review:

  • 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.


Heat Gain Through Thermal Bridging

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

How to review: Adjust the thermal bridging coefficient in Heat Load > General or override it in the room’s properties.


Heat Gain Through Internal Sources

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

How to review:

  • 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.


Heat Gain Through Solar Gain

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

How to review:

  • Check the solar gain coefficient in Methods > Solar Gain.

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


Heat Gain Through Spare Gain

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

How to review: Configure the spare gain percentage in Heat Load > General or override it in the room’s properties.


Heat Loss Through Internal / External / Party Wall

  • 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


Heat Gain Through Internal / External / Party Wall

  • 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.

Heat Loss Through Internal / External Door

  • 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


Heat Gain Through Internal / External Door

  • 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.


Heat Loss Through Floor

  • 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


Heat Gain Through Floor

  • 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

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


Heat Loss Through Roof/Ceiling

  • 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


Heat Gain Through Roof / Ceiling

  • 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.


Floor Temperature

  • 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.


Loop Mean Water Temperature

  • 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’.


Loop Spacing

  • 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.


Loop Heat Output

  • 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.


Loop ID

  • 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.


Loop Pressure Drop

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


The formula for calculating pressure drop is:

ΔP = f × (L / D) × (ρ × v²) / 2

Where:

  • 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/mÂł or lb/ftÂł)

  • v = Fluid velocity (m/s or ft/s)


How to review: Verify pipe spacings, internal diameter, and water properties in the System Settings and Room’s properties, where they may have been overridden.


Loop Length

  • 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.


Loop Volume

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


The formula used for this is:


TPiV = π × (Internal Diameter ÷ 2)² × Length

Where:

TPiV: Total Pipe Volume

Internal Diameter: The internal diameter of the pipe (consistent units, e.g., meters or inches).

Length: The length of the pipe (consistent units, e.g., meters or feet).


How to review: Check the pipe internal diameter and pipe length in the System Settings and the Room’s properties, where it may have been overridden.