1.6. Terms and abbreviations used<br>

## 1.6. Terms and abbreviations used

The following terms are used in this manual:

· Control circuit – heating zones, their pipe feeds and manifolds supplied with medium from one point (source or mixer) that provides defined supply temperature, which is sometimes lower than that defined for the remaining part of the installation, and which is determined during preliminary calculations for each individual circuit separately.

· Covering – the outermost layer (in contact with air in the room) of a heating floor, distinguished for the sake of selecting a material by the designer.

· Data table – table in which component (one component or several components of the same type) data may be edited.

· Expanding group – a group with a defined manner of self-duplication (appending subsequent modules) effected when expanding the frame of such group.

· Fitting component – a component inserted in the diagram onto a pipe-run; may be a fitting in usual sense, e.g. a valve, or in a more general sense, e.g. a pipe elbow or bend (pipe fitting), fixed point or partition crossing.

· Group – a special type of module, having additional features, such as border (frame), beyond which the components of the group cannot be moved.

· Installation – a set of interconnected heating or cooling medium circuits, terminal units and fittings originating from one source. One project file may comprise several installations.

· Junction – a point in the diagram where a pipe-run is connected to a preceding or following pipe-run or pipe-runs, in the latter case resulting in the combining or distribution of the stream of medium.

· Layer – one of the planes displayed in the graphical editor, which together form a whole (Installation, Construction, Base).

· Mixer – set of fitting components and pipe-runs enabling partial mixing of return and feed media in order to lower the temperature of the latter, e.g. in radiant heating systems. Reduced to one symbol in the application.

· Module – a set of several interconnected components, available for multiple use on a toolbar.

· Partition build-up (structure, definition) – specification of thermal properties by enumerating the layers of building materials in the partition (available only in Instal-heat&energy). A partition may also be defined by specifying the heat transfer coefficient “U” or thermal resistance “R” (available in Instal-heat&energy and Instal-therm).

· Paste together area – area around a fitting component or terminal unit (pipe-run, elbow, valve, tee, etc.), where two adjacent components are deemed connected directly, that is with no pipe in between.

· Pipe feed – a pair of pipes connecting heating zone to the manifold, usually an extension of pipes that form radiant surface heating circuit.

· Pipe-run – a section of pipework that carries a defined, constant flux of medium.

· Pipe-run with no flow - a section of pipework where, under conditions adopted for calculations, no flow of medium occurs. An example is the pipe-run that connects to an expansion vessel.

· Remote connection – used to link two parts of a system placed on separate sheets or on one sheet. Remote connection can be used for pairs of pipe-runs and for single pipe-runs.

· Shadow – a component (terminal unit, pipe-run, source) duplicated in another worksheet and assigned to the original component, that is to an identical component in terms of its functions, drawn in the worksheet from which the complete structure of connections is loaded. These components are not tested for the correctness of their connections.

· Sheet – part of project included in one drawing board of the graphical editor (called “Section” in the previous version). Components drawn on one sheet of plan should make up the so-called one graphical storey. Every other sheet of plan constitutes another graphical storey.

· Single-pipe connection - a section of pipework within a single-pipe heating system structure, which connects in series radiators of that structure.

· Source – a point of external supply of the installation, a boiler room or a heat exchanger.

· Terminal unit – a component that receives heat energy from the installation and transfers it to the environment or to other medium (radiator, heating riser, ventilation heater) or vice versa (terminal unit in a cooling or air conditioning system).

Abbreviations are applied in the Manual and the program for names that are often used:

Full name: | Abbreviation:
Heating zone | HZ
Radiant heating | RH, r.h.
Output, heat loss | Q/F
Output, heat loss per 1 m2 | q
Heating floor or wall surface temperature | tfs/qfs, tws/qws
Occupied (residential) zone | OZ
Peripheral (marginal) zone | PZ
Peripheral zone arranged by compacting pipe arrangement | cPZ
Peripheral zone arranged at the beginning of circuit, upstream of occupied zone | uPZ
Room temperature (depending on manufacturer) | ti/qi
Pipe spacing | T (B,b,p,r,VA)
Temperature difference for heating zone | Dt/Dq
Supply temperature | ts/qs
Floor covering/lining heat resistance | Rlb
Required output of terminal units | Qreq/Freq
Loss to be covered by radiant heating | Qrh/Frh
Part of heat loss assigned to specific HZ | Qrh/Fhz
Loss to be covered by radiator heating | Qrh/Frad
Valve on r.h. manifold, supply side | s.v.
Valve on r.h. manifold, return side | r.v.