modelThermalHeatConsumer_L3
Extends from TransiEnt.Basics.Icons.Consumer (Icon for consumers).
Information
1. Purpose of model
Low order model of a thermal heat consumer.
2. Level of detail, physical effects considered, and physical insight
The heat exchange with the environment is considered at a low resolution by aggregating the heat transfer through the walls and windows, the heat capacity and the heat gains and losses through solar irradiance, ventilation and internal sources each in one instance.
3. Limits of validity
- No heat transfer inside consumer, transfered heat is directly connected to the consumer capacity
- Lumped capacity and heat transfer
4. Interfaces
HeatPorts for Internal Gains and HeatDemand
5. Nomenclature
(no remarks)
6. Governing Equations
(no remarks)
7. Remarks for Usage
This model uses instances of models from the Buildings Library developed by the Lawrence Berkeley National Laboratory. The library can be downloaded at https://simulationresearch.lbl.gov/modelica/download.html.
8. Validation
Tested in check model "TransiEnt.Consumer.Heat.Check.TestThermalHeatConsumer"
9. References
Michael Wetter, Wangda Zuo, Thierry S. Nouidui & Xiufeng Pang (2014) Modelica Buildings library, Journal of Building Performance Simulation, 7:4, 253-270, DOI: 10.1080/19401493.2013.765506
Senkel, A. (2017) Vergleich verschiedener Arten der Wärmeverbrauchsmodellierung in Modelica. Master Thesis. Hamburg University of Technology.
10. Version History
Model created by Anne Senkel (anne.senkel@tuhh.de) September 2017
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| SI.Volume | V | H*B*L | |
| Modelica.Units.SI.Area | A_Win | A_Window[1] + A_Window[2] + A_Window[3] + A_Window[4] | |
| Geometry | |||
| SI.Length | B | 8.2 | Width of Building |
| SI.Length | L | 12.3 | Length of Building |
| SI.Length | H | 2.59 | Height of Building |
| SI.Area[3] | A | {L*B + 2*L*H + B*H, L*B, B*H} | Base Area of Building |
| Real[3] | til | {Modelica.Constants.pi/2, Modelica.Constants.pi, Modelica.Constants.pi/2} | Tilt of Walls |
| Modelica.Units.SI.Area[4] | A_Window | {6.28, 3.87, 5.816, 0} | Total Window Area for Walls Facing South, West, North, East |
| Thermal Properties | |||
| SI.HeatCapacity | C | 19e6 | Heat Capacity of Inner Walls |
| SI.CoefficientOfHeatTransfer | h_int | 7.69 | Interior Heat Transfer Coefficient |
| SI.CoefficientOfHeatTransfer | h_ext | 25 | Exterior Heat Transfer Coefficient |
| Modelica.Units.SI.Temperature | T_start | 273.15 + 22 | Start Temperature of Room Air |
| Modelica.Units.SI.Temperature | T_start_medium | 273.15 + 22 | Start Temperature of Room Air |
| Real | k_Win | 3.4 | Total Thermal Transmission Coefficient of Window (incl. outer and interior heat transfer coefficient |
| Real | tau_diff | 0.6 | Transmittance of Window for Diffuse Radiation |
| Real | tau_dir | 0.6 | Transmittance of Window for Direct Radiation |
| Real | abs | 0.05 | Absorbance of Window for Solar Radiation |
| Ventilation | |||
| Real | ACR | 0.5 | Air Change Rate |
| Real | HR | 0 | Heat Regeneration |
| Modelica.Units.SI.MassFlowRate | mA_flow_nominal | V*1.2*6/3600 | Nominal Mass Flow Rate for Numerical Reasons (see Buildings.Examples.Tutorial.Boiler.System1 for more Information) |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a | port_HeatDemand | ||
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a | port_internalGains | ||
| Modelica.Blocks.Interfaces.RealOutput | T_room |
Components
Contents
| Name | Description |
|---|---|
 MediumA |