1.1. Concept

The concept of the new implemented structure level in SIMULATION STUDIO is based on the aim of obtaining a well structured graphical representation of the complete model on the one hand and a high level of modularity and flexibility on the other hand. This is achieved by dividing a model in several subsystems, which can be connected and replaced easily. In this way, modularity is given not only on component but also on subsystem level. A new feature realized within the subsystem approach is the possibility of removing and transferring subsystems without deleting or reconfiguring any visual connections in SIMULATION STUDIO. Fig. 2 shows a sketch of the new subsystem based structure level.

1.2. Subsystems

A subsystem is a collection of several components which are connected to each other in the common TRNSYS way. In solar thermal systems the subsystems are conform to the several loops in such a system, e. g. collector loop. Direct connections between components from different subsystems do not occur anymore. Instead of these connections the subsystems are connected via uniform interfaces. This gives the edge of avoiding many overlapping links in the graphical representation. Parameters that are used by the components within the subsystems are defined in separate EQUATION blocks belonging to the respective subsystem. As an example Fig. 3 shows the subsystem of a possible collector loop.