Tutorial 3 – Heat network




This tutorial will show you how to implement the following features in your energy model:

à Thermal network modelling: 3 sectors

àMultiple temperature levels


The model includes 3 energy hubs and has thus an energy hub diagram for each sector:

-          Sector 1


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-          Sector 2


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-          Sector 3

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If you’re in need of more information on a certain aspect of the software don’t forget to look into the documentation. Furthermore, if anything is unclear you can find the Help button on the webpage or send an email to: support@sympheny.zendesk.com.



Step 0 – Getting started

The procedure here is the same as for Tutorial 1. You can name the project, Analysis and the scenario, Tutorial 3, Thermal Network modelling and Baseline respectively.



Step 1 - Hubs

The hubs in this tutorial represent 3 sectors of a city.

à Select Add New Hub on the Hubs page and name it Sector 1 and press Add.

à Repeat this procedure for each sector. Each sector will be connected with a cold and hot thermal network (see step 6).

Once you have defined the 3 sectors, you can see and move around 3 hubs in the energy hub diagram on the lower part of the page.

à Press Next on the lower right corner to move to the Energy Carriers (EC) section.



Step 2 – Energy carriers

à Select Add New Energy Carrier to define a new energy carrier.

à Assign a Type and Name to each energy carrier that you create and Add it.

Find below the list of energy carriers used here.



Custom name

Thermal Energy

Heat 50-60°C


Thermal Energy

Heat 10-20°C


Thermal Energy

District Heat 60°C


Thermal Energy

Cold Water Source


Thermal Energy

Heat Ambient


Electrical Energy



Thermal Energy






Step 3 – Energy demands

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Every hub has its own demand in cold and hot heat.

à Thus, for every sector select the hub that requires the energy (Sector 1,2 or 3),

à Then select the energy carrier (Heat 50-60°C or Cooling) related to the demand and name this energy demand (Heat/Cooling Demand).

To make things easier, assume that each sector has the same heat and cooling demand and select the profiles from the database.

à Press Select From Our Database and select the following energy demands:

-          Heat 50°C-60°C : MFH-Full_Retrofit-144299-Heat

-          Cooling: MFH-Full_Retrofit-144299-Cooling

à Give them a scaling factor of 50 and click Add.

The electricity demand of the hub is ignored. The electricity needed to make the heat pump work is determined by the optimization.

The blocks representing the energy demand will appear on the energy hub diagram below your defined demands.

à Select Next to move to the On-Site resources section.



Step 4 – On-site resources

No on-site resources are needed for this model.

à Select Next to move to the Imports & Exports section.



Step 5 – Energy Imports & Exports

à Insert the following imports in your model:

Energy carrier

Price (CHF/kWh)

CO2 (kg-CO2/kWh)






District Heat 60°C




Cold Water Source





This models the fact that the cold-water source is situated in the sector 3 and that the district heat comes from sector 2. Electricity on the other hand is assumed to be imported from the grid to each sector. Note that the Cold Water Source could also be implemented as an on-site resource. This would make no difference for the optimization.

No energy exports are needed in this model.

à Select Next to move to the Supply Technologies section.



Step 6 – Supply Technologies

Supply Technologies are divided between Conversion Technologies and Storage Technologies. Let’s go through the one’s used for this tutorial.


Step 6.1 – Conversion Technologies common to each sector

Each sector includes the same Water Source Heat Pump and the heat exchanger HEX cooling which links the cold water network to the Cooling Demand.

à Select Add New Conversion Technology to add it to every sector.

1.       Water Source Heat Pump

Note that the primary input EC is Electricity and that all 3 hubs are selected.

2.       HEX Cooling

à Don’t forget to tick the Virtual Technology? box.


Step 6.2 – District Heat connection in sector 2

Sector 2 takes heat from the district heating system and forwards it through pipes to the other sectors. Thus, for sector 2 only, add the following conversion technology:


Step 6.3 –Cold water source connection in sector 3

Sector 3 takes water from the cold-water source and transforms it into the energy carrier Heat 10-20°C. Thus, for sector 3 only, add the following conversion technology:

à Select Next to move to the Network Technologies section.



Step 7 – Network Technologies and Links

To create a network, you need to first create the network technology that allows you to create the links between the different energy hubs. All possible links should be specified; the optimizer will select which connections should optimally be installed and their respective dimensioning.

Two networks are needed: one for the cold and another for the hot heat.

à Select Add New Network Technology and create the following network technology the energy carrier Heat 50-60°C:

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à Repeat the same procedure for the energy carrier Heat 10-20°C:

à Press Add New Network Link to connect all the hubs together.

à Select the two hubs that should be connected with one another, the Network Technology used (Anergy or HT heat network) and the length of the network link

à Repeat this procedure to link together every hub with both networks. This then gives you the following list:

Select Next to move to Other.



Step 8 – Other

This section allows to include the current interest rate in [%] to the model.

à Set it to 2%.



Step 9 – Review

The review section allows to have an overview over the entire scenario specification and edit a section if it is needed.

à Select Finish Specification & Prepare for Execution to get to the execution of the model.



Step 10 – Execution & Results

Next to the Setup section you can find the Execution section where you select the scenario to be optimized, the two objectives the optimization should be based on and finally the number of points wanted in the pareto front.

à Select Execute to start the optimization.

à Once you receive an email that the optimization is completed, Go to the Results section and Select Download to go through the results of the optimization.

à Click on View results to open the dashboard of your optimal design