modelSlabOnGround

opaque floor on ground slab

Extends from IDEAS.Buildings.Components.Interfaces.PartialOpaqueSurface.

Information

This is a floor model that should be used to simulate floors on solid ground. See IDEAS.Buildings.Components.Interfaces.PartialOpaqueSurface for equations, options, parameters, validation and dynamics that are common for all surfaces.

Typical use and important parameters

The model contains several parameters that are used to set up a simplified model of the influence of the environment on the ground temperature. The model assumes that the floor plate is connected to a (heated) zone that is surrounded by air at the ambient temperature.

References

ISO 13370: Thermal performance of buildings - Heat transfer via the ground - Calculation methods.

Parameters

TypeNameDefaultDescription
Modelica.Units.SI.LengthPWall4*sqrt(A)Total floor slab perimeter
Modelica.Units.SI.TemperatureTeAvg273.15 + 10.8Annual average outdoor temperature
Modelica.Units.SI.TemperatureTiAvg273.15 + 22Annual average indoor temperature
Modelica.Units.SI.TemperatureDifferencedTeAvg4Amplitude of variation of monthly average outdoor temperature
Modelica.Units.SI.TemperatureDifferencedTiAvg2Amplitude of variation of monthly average indoor temperature
Dynamics › Initial condition
Modelica.Units.SI.Temperature[nLayGro]T_start_grofill(TeAvg, nLayGro)Initial temperatures of the ground layers (with first value = deepest layer and last value = shallowest layer
Convection
Booleanlinearisesim.lineariseDymola= true, if heat flow to ground should be linearized

Components

TypeNameDefaultDescription
Modelica.Units.SI.HeatFlowRateQmif not linearise then UEqui*A*(TiAvg - TeAvg) - Lpi*dTiAvg*cos(2*3.1415/12*(m - 1 + alfa)) + Lpe*dTeAvg*cos(2*3.1415/12*(m - 1 - beta)) else sum({UEqui*A*(TiAvg - TeAvg) - Lpi*dTiAvg*cos(2*3.1415/12*(i - 1 + alfa)) + Lpe*dTeAvg*cos(2*3.1415/12*(i - 1 - beta)) for i in 1:12})/12Two-dimensional correction for edge flow
Modelica.Blocks.Routing.RealPassThroughTdesGroundDesign temperature passthrough
IDEAS.Fluid.Sources.MassFlowSource_Tboundary1
IDEAS.Fluid.Sources.MassFlowSource_Tboundary2

Revisions

  • January 30, 2025, by Klaas De Jonge:
    Use TdesGround.y for calculating QTra_design to avoid causality warning. See #1402.
  • November 7, 2024, by Anna Dell'Isola and Jelger Jansen:
    Update calculation of transmission design losses. See #1337
  • May 16, 2024, by Lucas Verleyen:
    Created final and protected parameter T_start_gro for initial temperature of the ground (layGro).
    See #1292 for more information.
  • Februari 18, 2024, by Filip Jorissen:
    Modifications for supporting trickle vents and interzonal airflow.
  • April 26, 2020, by Filip Jorissen:
    Refactored SolBus to avoid many instances in PropsBus. See #1131
  • October 13, 2019, by Filip Jorissen:
    Refactored the parameter definition of inc and azi by adding the option to use radio buttons. See #1067
  • January 25, 2019, by Filip Jorissen:
    Revised initial equation implementation. See issue #971.
  • August 10, 2018 by Damien Picard:
    Set nWin final to 1 as this should only be used for windows. See #888.
  • May 14, 2018, by Filip Jorissen:
    Revised value of energyDynamics for ground layers such that unique initial conditions can be defined.
  • January 2, 2017, by Filip Jorissen:
    Added default values for parameters inc and azi.
  • October 22, 2016, by Filip Jorissen:
    Revised documentation for IDEAS 1.0.
  • December 7, 2016 by Damien Picard:
    Set placeCapacityAtSurf_b to false for the last layMul layer. This is necessary due to the initialization which is overspecified when two capacities are connected to each other without resistances between. Using dynamicFreeInitial for both the first layer of layGro and the last one of LayMul did not solve the problem.
  • September 27, 2016 by Filip Jorissen:
    Different initialisation for state between layMul and layGround for avoiding conflicting initial equations.
  • February 10, 2016, by Filip Jorissen and Damien Picard:
    Revised implementation: cleaned up connections and partials.
  • June 14, 2015, Filip Jorissen:
    Adjusted implementation for computing conservation of energy.