# GreenCity Simulation Library

Model connected energy systems dynamically, compare technical alternatives, and investigate operating and control concepts before implementation.

Product Overview

## Investigating Energy Systems Before Implementation

The GreenCity Simulation Library supports the planning, optimization, and assessment of building, plant, and district energy systems in SimulationX. It combines models of generators, storage, networks, and consumers into application-specific overall systems. Technical interactions and alternatives can be investigated before plants are built or existing systems are modified.

Alongside thermal and electrical components, the library includes building and plant models, different storage technologies, and models for electromobility, controls, and user behavior. For research and pilot projects, custom models can be developed and integrated into existing systems.

- Model coupled energy systems dynamically
- Compare system and control alternatives
- Assess planning and operation technically

 ![Example of a district energy system modeled with GreenCity](/images/sites/ea-energy/pages/solutions/products/green-city/library.png)

Model Library

## Functions and Model Coverage

GreenCity represents technical components and their interactions in dynamic energy systems. Models can be combined and extended for different system sizes and connected to measurement data or custom applications.

### With GreenCity You Can

- Investigate supply security
- Assess renewable energy potential
- Integrate energy storage into overall systems
- Compare plant and control concepts
- Plan charging infrastructure and vehicle fleets
- Investigate heating and cooling supply
- Compare energy demand, consumption, and operating and investment costs
- Prepare SiL and HiL tests

### Model Areas

- **Thermal components:** Heat exchangers, heating and cooling elements, solar thermal, and thermal storage
- **Buildings and plants:** Building variants, controllers, and calculation models
- **Electrical components:** Grids, photovoltaics, wind energy, electromobility, and hydrogen
- **Storage:** Models for electrical, thermal, and seasonal storage
- **Interfaces:** Open Modelica interfaces for coupling your own controller applications

Applications

## Example Models From GreenCity

### Combined Heat and Power for a Street

 ![GreenCity model of a combined heat and power plant supplying a street](/images/sites/ea-energy/pages/solutions/products/green-city/chp-street.png)

The model represents a street’s space heating, domestic hot water, and electricity demand through load profiles. A combined heat and power plant supplies the consumers; thermal storage buffers heat load peaks. Among other things, the simulation shows how heat-led operation affects coverage of the electrical load.

### Multizone Building With an Electric Vehicle

 ![GreenCity model of a multizone building with an electric vehicle](/images/sites/ea-energy/pages/solutions/products/green-city/multizone-electric-vehicle.png)

This example combines a two-zone building, an electric vehicle, a charging station, and battery storage. A photovoltaic system and a small wind turbine supply electricity; an air-to-water heat pump provides heating.

### Office With Thermal, Cooling, and Ice Storage

 ![GreenCity model of an office with thermal, cooling, and ice storage](/images/sites/ea-energy/pages/solutions/products/green-city/office-heating-cooling.png)

The model investigates an office building with heating and cooling demand. A heat pump generates heat for building heating and cooling energy for building cooling. Ice storage buffers cooling energy seasonally, while sensible cooling storage provides short-term buffering.

### Charging Station Supplied by Renewable Energy

 ![GreenCity model of a charging station supplied by renewable energy](/images/sites/ea-energy/pages/solutions/products/green-city/renewable-charging-station.png)

The model represents an electric vehicle charging station with a photovoltaic system and electrical storage. It enables investigation of the extent to which vehicles can be charged with locally generated renewable energy.

Further models, extensions, and application examples are available on the product page.

[Explore GreenCity](https://www.green-city-library.de/)