modelPVT_UN_Electrical

Electrical Behavior of Unglazed Rear-Non-Insulated PVT Collector
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Extends from Modelica.Icons.Example (Icon for runnable examples).

Information

This model validates the electrical performance of the PVT_UN collector, an uncovered and uninsulated PVT collector, using the same 58-day outdoor dataset as the thermal model (Veynandt et al., 2023).

The model uses the PVWatts V5 formulation and includes:

  • Temperature-dependent efficiency losses
  • Datasheet-based estimation of UAbsFluid
  • Constant system loss factor (7 %)

The PV cell temperature is derived from the thermal model using a two-node coupling via UAbsFluid, ensuring accurate representation of the thermal-electrical interaction.

Despite the presence of extreme weather conditions, including wind speeds up to 10–12 m/s and continuous pump operation, the electrical model remains robust. Validation shows excellent agreement with measurements, with a normalized MAE of 5.2 % and nRMSE of 9.9 % (Meertens et al., 2025).

The model's accuracy confirms the reliability of the datasheet-based estimation method for UAbsFluid, even under challenging real-world conditions.

Parameters

TypeNameDefaultDescription
Stringweek"week1"
Modelica.Units.SI.TemperatureT_start17.086651 + 273.15Initial temperature (from measurement data)
RealeleLosFac0.07
Data.Uncovered.UN_ValidationdatPvtCol

Components

TypeNameDefaultDescription
Modelica.Blocks.Sources.CombiTimeTablemeaDat
Modelica.Thermal.HeatTransfer.Celsius.ToKelvinTFluKel
IDEAS.Fluid.Sources.Boundary_pTsouOutlet for water flow
IDEAS.Fluid.Sources.MassFlowSource_TbouInlet for water flow, at a prescribed flow rate and temperature
IDEAS.Fluid.PVTCollectors.Validation.PVT_UN.PVTQuasiDynamicCollectorValidationPvtCol
Modelica.Blocks.Sources.RealExpressionmeaPel[W]
Modelica.Blocks.Sources.RealExpressionUAbsFluid[W/m2K]
Modelica.Blocks.Sources.RealExpressionsimPel[W]

Contents

NameDescription
Medium

Revisions

  • September 3, 2025, by Jelger Jansen:
    Introduce week parameter to change the weather dataset. This is for #1462.
  • July 7, 2025, by Lone Meertens:
    First implementation PVT model. This is for #1436.