Program TELERIS  

Remote heating networks design

Purpose Remote heating networks design.

Features The program calculates the steady state of a remote heating network.
Network consists of a supplying and a return line.
Supplying line supplies the hot water to users, return line brings back the exausted water.
In detail the program calculates:
  • pressures and temperatures,
  • flow rates,
  • heat losses, 
  • heat supplied.

Defining the network
The network is described by a directed graph in which:

  • arcs are the elements of the net,
  • nodes are the points of junction of two or more elements.

:Possible elements are:

  • sources (feeds to the net),
  • pipes,
  • heat exchangers,
  • booster stations,
  • pressure relief valves,
  • interception valves,
  • minor losses (pipe enlargements, pipe constrictions, bends, tee joints, .... ).

Applied formulas
Pipes pressure drops are calculated according to Darcy Weisbach Colebrook's formula.
Water specific weight and viscosity are calculated according to temperature.

Contemporaneity coefficient
Families demands are strongly intermittent.
The more are the families supplied, the less is probable that all flow rates have the maximum value at the same time.
Contemporaneity coefficient  is defined as the ratio between maximum theoretical demand and real demand; where maximum theoretical demand is the product of family maximum demand by the number of supplied families.

Contemporaneity coefficient changes along the network.
To design correctly a remote heating network it is necessary to apply the contemporaneity coefficient to every pipe flow rate, according to the number of families supplied by the pipe.
For more details see chapter 4.10 of book "Program Teleris release 3.2 - Steady  state calculation of a remote heating network) joined to the program.
Chapter 4.10 Download  (

Program checks inputs values and verifies the network behaviour. 

Linking to a cartographic system

The program may run in two ways:
  • as a stand alone program,
  • connected to a cartographic system.

In this second point the program only calculates the steady state and save results.

This company supplies cartographic systems including program Teleris:

DEK   piazza Martiri della libertÓ, 2 - 40131 Bologna

Network restrictions Program is furnished in two editions: enterprise and light:

Entrprise edition restriction

  • maximum number of nodes  10000,
  • maximum number of pipes   10000,
  • maximum number of sources    200,
  • maximum number of relief valves and booster stations  200,
  • maximum number of minor losses           400,
  • maximum number of interception valves  400,
  • maximum number of gas mixture components  12.

Light edition restriction: the maximum number of nodes is 400.

Platforms Windows 95 and those after.


Program Teleris release 3.2
- remote heating network design 

The book (108 pages), written with contribution of Enidata (ENI group):
  • describes in detail all the equations utilized,
  • explains how to use the program.


        1.1   Density
        1.2   Weight density
        1.3   Pressure
        1.4   Flow rates
        1.5   Compressibility
        1.6   Viscosity
        1.7   Specific heat
        1.8   Enthalpy

        2.1   Sources
        2.2   Return line pressure control
        2.3   Pipes
           2.3.1   Bernulli's theorema
           2.3.2   Darcy-Weisbach-Colebrook formula
           2.3.3   Thermical resistance
           2.3.4   Temperature of water coming out from a pipe
        2.4   Pumps and pressure relief valves
        2.5   Minor losses
        2.6   Nodes
        2.7   Heat exchangers
        2.8   Demands
           2.8.1   Fixed demends
           2.8.2   Family demands
           2.8.3   Node compensation heat flows
           2.8.4   Source compensation heat flows

        3.1  Water kinematic viscosity
        3.2   Water specific weight
        3.3   Water specific entalpy       
        3.4   Liquid/vapour equilibrium

        4.1   "Equivalent" ambient temperature

        5.1   Network restrictions
        5.2   Typical working session

    6.   FORMS LIST
        6.1   Main men¨
        6.2   Files
        6.3   Parameters and formulas
        6.4   Network description
        6.5   Solving
        6.6   Results
        6.7   Reports
        6.8  Setting
        6.9  Example

Executing program Teleris
        7.2   Structure of input/output data

    8.   APPENDIX
        8.1   Surface roughness
        8.2   Thermal conductivity
        8.3   Relations between units

    9.   SYMBOLGY

  10.   BIBLIOGRAFY     

Price Enterprise edition
Program Teleris + book :  
1500 euro + 300 (taxes)  = 1800 euro.

Light edition
Program Teleris + book:   
450 euro +  90 (taxes)  = 540 euro.

Download Demo program download

Program description download

Ing. Valerio Tarenzi
via Pellegrino Rossi, 5   40131 Bologna
tel. 051-523101