Program TELERIS  

Remote heating networks design

• 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  (uttlin.zip)

Cheks
Program checks inputs values and verifies the network behaviour. 

• 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:

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.

Program Teleris release 3.2
- remote heating network design 

• describes in detail all the equations utilized,
• explains how to use the program.

         ABSTRACT

    1.   PHYSICAL QUNTITIES AND UNITS
        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.   DEFINING THE NETWORK
        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.   WATER PHISIC CHARACTERISTICS
        3.1  Water kinematic viscosity
        3.2   Water specific weight
        3.3   Water specific entalpy       
        3.4   Liquid/vapour equilibrium

    4.   THERMAL WAVES ACROSS THE GROUND
        4.1   "Equivalent" ambient temperature

    5.   INSTALLATION
        5.1   Network restrictions
        5.2   Typical working session

    6.   FORMS LIST
        6.1   Main menù
        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

    7.   LINKING TO A CARTOGRAPHIC SYSTEM
        7.1   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     

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

Program description download