.AixLib.ThermalZones.HighOrder.Rooms

Information

Overview

Package for rooms.

Concept

In a room model the following physical processes are considered:

• transient heat conduction through walls; each wall consists of several layers with different physical properties; further discretization of each layer is possible
• steady-state heat conduction through glazing systems; transmission of short wave radiation through the window depends on a constant coefficient; transmitted radiation is considered together with the radiation from room facing elements
• heat convection at outside facing surfaces either with a constant coefficient, depending on wind speed, or depending on wind speed and surface abrasiveness
• heat convection at inside facing surfaces either with a constant coefficient, depending on wind speed, or depending on wind speed and surface abrasiveness
• heat convection at inside facing surfaces depends on the wall orientation and the temperature difference between the room air and the wall surface
• radiation exchange between room facing elements
• temperature balance equations for the room airvolume; per room only one air node is considered; humidity is not considered in the air node

All outer walls are whole walls connected to the room air and the ambient, while inner walls are half walls, each half belonging to one of the rooms which share the wall. Airflow among rooms is not explicitly considered.

We chose to parameterize according to the following criteria:

• thermal mass class: heavy, middle and light
• energy saving ordinance: WSchV 1984, WSchV1995, EnEV 2002 and EnEV 2009

By specifying these two parameters, all wall, window and door types in a house are automatically set correctly. Furthermore for a multi-family dwelling, for each apartment, the types for floor and ceiling are automatically set if the apartment is situated on the ground, last or an arbitrary upper floor.

We wanted to make the library easy to use and extend by future users and developers. To this purpose we put extra effort in creating easy to understand icons and graphical interfaces for parameter input. Because users might want to rotate or mirror a room to build up a whole floor, we wanted to transfer the information about the position of the walls in the room, the meaning of the parameters width and length as well as the existence of windows on the icon level.

Contents