Tutorial 4 – Power-to-gas

 

 

Overview

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

à Multiple solar energy carrier: Solar roof and façade
à Virtual Energy conversion
à P2G technology constellation: Electrolyzation + Methanation 
à H2 storage
à Complex energy pricing structures: Capacity based pricing

 

The energy hub diagram of this tutorial will look like the following:

 

 

Step 0 – Getting started

The procedure here is the same as for Tutorial 1. You can name the project, Analysis and the scenario, Tutorial 4, power2gas and Baseline respectively.

 

 

Step 1 - Hubs

The hub section allows you to create different energy hubs that will contain multiple energy conversion, storage and/or network technologies. This tutorial contains a single hub.

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à Select Add New Hub, name it (e.g. Swiss town) and press Save.

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 the energy carriers.

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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.

Type

Name

Custom name

Thermal Energy

Heat 50-60°C

-

Electrical Energy

Electricity

-

Electrical Energy

Electricity Renewable

-

Electrical Energy

Custom

Elec import

Solar Irradiance

Solar Roof

-

Solar Irradiance

Solar Facade

-

Fuel (Gaseous)

Gas

-

Fuel (Gaseous)

Hydrogen Pressurized

-

Fuel (Gaseous)

Hydrogen

-

Other

Custom

Grid usage import

Other

Custom

Grid dummy

 

The Grid usage import and Grid dummy EC are virtual EC that will be useful for step 6.5.

à Select Next to move to the Energy Demands section.

 

 

Step 3 – Energy Demands

à Press Add New Energy Demand to add an electricity or heat demand.

à Select the hub that requires the energy (only one hub here to choose from). Then select the energy carrier related to the demand and name this energy demand.

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

·       Electricity: MFH-Full_Retrofit-144299-Electricity

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

à Give them a scaling factor of 100 and Add.

The blocks representing the energy demand will appear on the energy hub diagram below your defined demands. Select Next to move to the On-Site resources section.

 

 

Step 4 – On-site resources

Since we have two solar energy carriers on for the roofs and one for the façades, we will need two solar irradiance profile. Indeed, the irradiance profiles are different depending on the mounting options.

à Select Add New Solar Resource to add the solar irradiance available. Select the energy carrier Solar Roof and the energy hub created before. Then, as for the Energy Demands, you need an excel file giving the Energy Profile of the irradiance for a year given in [kWh/m2].

à Select From Our Database, press on profile Irradiance Lugano 0 0, which corresponds to a horizontal mounting. Press Select Profile. Finally, give the available solar collector area of 10 000 [m2] and select Add.

à Repeat the procedure for Solar Façade but this time select the profile Irradiance Lugano 90 0, which corresponds to a vertical mounting facing South, and give an available solar collector area of 2000 [m2].

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

 

 

Step 5 – Import & Exports

à Select Add New Import/Export to add the price & CO2 emissions of imported electricity and gas:

Energy carrier

Price (CHF/kWh)

CO2 (kg-CO2/kWh)

Elec Import

0.19

0.44

Gas

0.08

0.22

 

The virtual technology Grid dummy has to be exported in order for the model to run. Thus, add it to the exports.

Energy carrier

Export Price (CHF/kWh)

On-site sale price

Grid dummy

0.00

0.00

 

 

à Select Next to move to the Supply Technologies section.

 

 

Step 6 – Supply Technologies

Like mentioned in Tutorial 1, the conversion technologies Rooftop PV and Gas CHP will be used again in this tutorial.

à Select Add New Conversion Technologies and select the Select Saved button to add them from your saved technologies.

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à  Select the Rooftop PV technology and press the Select Technology button. Fill in the Name and Hubs box. Then press Save.

à Execute the same procedure and select Gas CHP instead of Rooftop PV.

 

Step 6.1 – Multiple Solar Energy carrier

Solar irradiance can be absorbed through different means. So, additionally to the just creating Rooftop PV, we will create Façade PV.

à Select Add New Conversion Technology and add the following technology:

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Step 6.2 – Virtual Technology: Renewable electricity to Electricity converter

To be able to use the produced electricity by the PV on-site, a virtual technology is needed to merge Renewable electricity with conventional electricity.

à Select Add New Conversion Technology and tick the virtual technology box. Give it the function that takes as input Electricity Renewable (coming from the PV) and as output Electricity.

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Step 6.3 - P2G technology constellation

P2G can be modelled by using an electrolyser and a methanation conversion tech.

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à Model the Electrolyser as follows:

à For the Methanation conversion, press Add New Conversion Technology and fill in the boxes:

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à The hydrogen produced can also be used to power a Fuel Cell:

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Step 6.4 – H2 storage

To be able to store hydrogen it has to be pressurized.

à Create the hydrogen pressurization unit as a conversion technology:

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The pressurized hydrogen can then be stored into a H2 storage unit.

à Select Add New Storage Technology and fill in the boxes like given below:

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Finally, to use the stored hydrogen it has to be depressurized.

à Select Add New Conversion Technology and give the modelling parameters of a H2 depressurization unit:

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Step 6.5 – Capacity based pricing

Sometimes electricity can have a yearly price per kW. To implement this, you need a workaround that uses the virtual energy carriers Grid usage import and Grid dummy.  The imported electricity (Elec import) is split into one unit of electricity and one unit of power (Grid usage import). Then, this power receives a price in kW that models the grid power cost.

You need to create two virtual conversion technologies.

à Select Add New Conversion Technology on the Supply Technology section and ticking the virtual technology box. The first technology, named Power Import, has no costs and can be modelled as the following:

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Then, create a second technology, named Grid power costs, that represents the yearly cost of power import:

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à Select Next to move to the Network Technologies section.

 

 

Step 7 – Network Technologies and Links

Network technologies and links are used to model the pipes used to share an energy carrier between different hubs. This tutorial has only one hub and won’t need any links. See Tutorial 3 for an example with multiple hubs.

à 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.

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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