citygml-energy issueshttps://git.rwth-aachen.de/energyade/citygml-energy/-/issues2019-10-24T16:31:28+02:00https://git.rwth-aachen.de/energyade/citygml-energy/-/issues/160Modelling of multi-pane windows2019-10-24T16:31:28+02:00Joachim BennerModelling of multi-pane windowsIn the Energy ADE 1.0 construction model, optical properties like transmittance or reflectance can only be related with a complete construction, and not with individual layers. Due to this limitation, it is not possible to model the diff...In the Energy ADE 1.0 construction model, optical properties like transmittance or reflectance can only be related with a complete construction, and not with individual layers. Due to this limitation, it is not possible to model the different glass panes and gaps of a multi-pane window **individually**. This is inconsistant with the data model for opaque constructions, and in some cases complicates the usage of existing window data.
It is therefore proposed to enable an optional specification of optical properties on material level by introducing a new class **TransparentSolidMaterial**, derived from SolidMaterial. Furthermore, for representing gaps in multi-pane windows filled with different kinds of gases, an optional attribute **gasType** should be added to the class **Gas**.
![TransparentSolidMaterial](/uploads/a0b54c3b15d3d57dc4a38b1871dcc678/TransparentSolidMaterial.png)Joachim BennerJoachim Bennerhttps://git.rwth-aachen.de/energyade/citygml-energy/-/issues/158Revision of dataType OpticalProperties2019-10-24T16:18:32+02:00Joachim BennerRevision of dataType OpticalPropertiesThe dataType OpticalProperties enables to specify reflectance, transmittance and emissivity of a construction, but not the **absorptance**. Especially for opaque materials, simulation systems like EnergyPlus support the specification of ...The dataType OpticalProperties enables to specify reflectance, transmittance and emissivity of a construction, but not the **absorptance**. Especially for opaque materials, simulation systems like EnergyPlus support the specification of this parameter. That due to physical laws the absorptance can principally be calculated on base of reflectance, transmittance and emissivity is totally irrelevant in this context: It is much better to directly specify the needed parameter instaed of three non-needed parameters.
In addition to reflectance, transmittance and emissivity, the dataType OpticalProperties has a parameter glazingRatio, specifying the glazing ratio of a ThermalOpening referencing the Construction. Conceptionally, glazing ration is not an optical property, but a structural parameter of either a Construction or a ThermalOpening.
It is therefore proposed
* to introduce a new dataType **Absorptance**,
* to extend OpticalProperties with a new attribute **absorptance: Absorptance [0..*]**,
* to eliminate the attribute **glazingRatio**.
In which class (Construction or ThermalOpening) the glazingRation shall be specified is open for discussion.
![Absorptance](/uploads/dce7226cf9a3ea76ef3882f5eeb3159f/Absorptance.png)Joachim BennerJoachim Bennerhttps://git.rwth-aachen.de/energyade/citygml-energy/-/issues/157Modelling of Layer and LayerComponent2019-10-24T16:22:33+02:00Joachim BennerModelling of Layer and LayerComponentAn Energy ADE Construction may refer to an ordered list of Layer objects, and a Layer is composed of one or more LayerComponents. In version 1.0, the layer thickness can be specified individually for each LayerComponent. This enables to ...An Energy ADE Construction may refer to an ordered list of Layer objects, and a Layer is composed of one or more LayerComponents. In version 1.0, the layer thickness can be specified individually for each LayerComponent. This enables to specify highly complex constructions (see below), which cannot be processed by existing building energy simulation systems. It is therefore proposed to ransfer the attribute thickness from LayerComponent to Layer.
![ComplexLayerModel](/uploads/3c91320f9856c9d7fb8891dd228b3bc0/ComplexLayerModel.png)
![NewLayerModel](/uploads/ae5259b84ba9f208bdc3bede516e5ed4/NewLayerModel.png)Joachim BennerJoachim Bennerhttps://git.rwth-aachen.de/energyade/citygml-energy/-/issues/156Explicit specification of convective heat transfer coefficients2019-10-24T15:48:09+02:00Joachim BennerExplicit specification of convective heat transfer coefficientsMost building energy simulation systems automatically calculate the inside and outside convective heat transfer coefficients. In some cases, especially for modelling benchmark tests list BESTEST, it should however be possible to explicit...Most building energy simulation systems automatically calculate the inside and outside convective heat transfer coefficients. In some cases, especially for modelling benchmark tests list BESTEST, it should however be possible to explicitly specify these parameters. It is therefore proposed to extend the class **Construction** by two parameters **insideConvectionCoefficient** and **outsideConvectionCoefficient** (type Measure).
![Construction](/uploads/cb1d1af8e23a3560aa3a695587f3b89d/Construction.png)Joachim BennerJoachim Benner