2.4. Radiator heating design (plan views and schematic view)<br>

## 2.4. Radiator heating design (plan views and schematic view)

As mentioned at the beginning, it is possible to make complete calculations of a radiator heating system based only on a schematic view, and for simple systems within one storey – also on basis of only a plan view. However, here we will assume that that the user wants to have a full set of drawings. Therefore the representations of the same components – terminal units, pipe-runs and fittings – may (but do not have to) appear in two drawings – the schematic view and one of the plan views.

We adopted a principle that the structure of the system (installation) is designed on the basis of each so-called original component, which may be located on a plan view or a schematic view and must be connected with another original component (e.g. an original radiator with an original pipe-run), and up to the source. This does not mean that the whole system must be described by means of originals on a plan view only, or on a schematic view only. Remote connections enable passing from one sheet to another, and that includes passing from a “Plan view” sheet to a “Schematic view” sheet and vice versa. Therefore part of the system may be described by means of plan views, and part of it by means of a schematic view (or schematic views) and then no component has to be appear on two drawings.

If, however, we want to have a schematic view that covers the entire system, and at the same time we want to have plan views with drawings of radiators (in order, for instance, to indicate their size and valve settings) and a plan view of the basement with the distribution network, we then have to use in the drawings duplicates of components called shadows. These shadows are inserted into drawings in the same manner as the originals. After placing all components in the drawings we have to determine associations between originals and shadows and indicate which component is the shadow.

Further in the text we will call the original components just components. Shadows are not taken into account when checking connections. Removing a shadow does not destroy the structure of the system for calculations, removing an original will cause an error.