Simple Building Life Cycle Energy Usage Model

Class Name

• RSimpleBuildingLifeCycleEnergyUsageModel

Location in Objects Pane

• Models > Model > Consequence > Environmental > Simple Building Life Cycle Energy Usage

Model Description

Model Form

• This model produces the lifecycle energy usage in a building at a coarse level of detail
• Pre-use phase
$${E_{PU}} = {a_f}({n_s}{i_{pu}} + {i_p})$$
• Operation phase
$${E_o} = {t_{des}}\left( {{{24(3600)(A({r_{ww}}{U_{win}} + (1 - {r_{ww}}){U_{wall}}) + 0.33NV){D_{HDD}}} \over \eta }} \right)$$
• End-of-life phase
$${E_{EoL}} = {n_s}{a_f}{i_{eol}}$$

DDM sensitivities

• No

Properties

Object Name

• Name of the object in Rt
• Allowable characters are upper-case and lower-case letters, numbers, and underscore (“_”).
• The name is unique and case-sensitive.

Display Output

• Determines whether the model is allowed to print messages to the Output Pane.

Footprint Area

• \({a_f}\) = The building footprint area in m².

N Storeys

• \({n_s}\) = The number of stories.

PU Intensity

• \({i_{pu}}\) = The energy intensity for the pre-use phases in J/m².

Parking Intensity

• \({i_p}\) = The intensity for the presence of underground parking in J/m² of parking.

Surface Area

• \({A}\) = The surface area of the building exterior in m².

Rww

• \({r_{ww}}\) = The window to wall ratio.

Uwindow

• \({U_{win}}\) = The window assembly thermal transmission coefficient in W/m²/K.

Uwall

• \({U_{wall}}\) = The total wall thermal transmission coefficient in W/m²/K.

Nac

• \({N}\) = The number of air changes per hour in ach.

IndoorVolume

• \({V}\) = The total air volume in building in m³.

Design Life

• \({t_{des}}\) = The design life of the building in years.

Hdd

• \({D_{HDD}}\) = The heating degree days using the building‘s reference temperature in K days for reference temperature

Eff

• \({\eta}\) = The overall heating efficiency.

EOL Intensity

• \({E_{EoL}}\) = The energy associated with the end of life phase of a building in J.

Output

• \({E}\) = The lifecycle energy usage in a building in J.
• The output is an automatically generated generic response object, which takes the object name of the model plus “Response”.

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• Removes the object.