1. THERMAL BUILDING SIMULATION WITH MAPLESIM
Adhi Susilo and Martin Bauer
Faculty of Architecture and Civil Engineering
Hochschule Augsburg, Germany

2. Outlines Abstract Introduction Modelica and MapleSim Basic model
Room model and Heat gain
Results
Conclusions

3. Abstract
This work is based on a systematic approach in construction process.
MapleSim is one of simulation tools that is able to work on both approaches; causal and acausal.
VDI 6020 is a benchmark to evaluate the model.

4. Introduction Formalizing Building Construction Process Design process
Creating a system
Systematic Engineering Design
(7 steps in 4 phases)
Planning and task clarification
Conceptual design
Embodiment design
Detail design

5. Design process
Analyzing
Synthesizing

6. Systematic Engineering Design
Ref. : Pahl / Beitz – VDI 2221

7. Phases of Contruction Requirements Function elements Construction
Generalized construction devices
Construction devices
Single components

8. Function elements Lead water Roof Insulate thermal energy
Wall
o o o
Lead water
Insulate thermal energy
Insulate th.energy
Ventilate air
System boundary

9. General construction devices
Principle graph monopitch roof
Insulate energy
Lead water
Lead water
System boundary
Ventilate air
External Wall & Window

10. Insulate thermal energy
Construction devices
A wall (three layers) model
o o o o o o o o o o o o o
Roofing layer
Ventilation layer
Underlayment layer
(Wood) sheathing l.
Vapour Barriers layer
Insulation layer
Siding layer
Ventilate air
System boundary
Lead water
Insulate thermal energy
(Roof) area

11. Modelica and MapleSim
The equation based language, or called an acausal system.
There are many basic components in its library, including electrical, mechanical, and thermal devices; sensors and sources; and signal blocks
Example of thermal library components
Boundary Condition Controls
Fixed Temperature
Heat Transfer Components
Body Radiation
Convection
Heat Capacitor
Thermal Conductor
Prescribed Heat Flow

12. Basic Model We take VDI 6020 Example 1 as a bench mark
External Wall & Window

13. Material properties of the Room type S (VDI Richtlinie 6020, 2001)

14. Building element A typical layer
A window with air gap is simulated by radiation and convection component

15. Room Model and Heat Gain

16. Internal Gain (An example of the internal gain within ten days)

17. Results

18. Result from MapleSim 4

19. Conclusions Further Work
The simulation model can be prepared like a systematic approach in construction process.
A complex system is broken down into basic components.
Then, rearranging and synthesizing the basic component to simulate the overall system.
Though the gradient of the steady state of both results is different, but both simulations reach steady state at around day 60.
Further Work
Before bugs fixed, we have to create a smooth input with combination of other functions, for example a pulse function is substituted by combining sine function and on-off function.
Extending this model to accommodate a multizone building.

20. Acknowledgement Thank you
This work was supported by Urlaubskasse des Bayerischen Baugewerbe e.V.
Thank you