We have released version 1.0.0 of our UI tool SUSI.

SUSI is an important tool for simulating energy systems with ReSiE. Creating the necessary input files manually is difficult and tedious, which is why we created SUSI to aid this process. It is based on React Flow and runs in the browser. You can find an online instance here.

We have released version 1.0.0 of our energy system simulation engine ReSiE.

Reaching version 1.0.0 marks an important milestone for the project. After the preceding beta releases, ReSiE now provides a stable basis for modelling and simulating energy systems, including component-based system modelling, control strategies, economic and emissions evaluation, parameter studies, optimisation and sensitivity analysis.

Version 1.0.0 also marks the transition towards a more stable public interface. While ReSiE will continue to be developed and extended, future changes will place greater emphasis on maintaining compatibility of established project-file structures, component interfaces and workflows.

With this release, ReSiE is also prepared for publication in the Julia General registry. As part of this process, the Julia package has been renamed and dependency compatibility has been specified more explicitly.

The latest release can be found here and details are available in the documentation of the QuaSi project.

We have released version 0.15.0 of our energy system simulation engine ReSiE. This release introduces parameter studies, optimisation and sensitivity analysis, allowing energy systems to be evaluated systematically across different component sizes, operating parameters and assumptions.

The new parameter_study configuration supports systematic parameter variation as well as single- and multi-objective black-box optimisation. Objectives can be derived from simulation outputs, economic results and GHG emissions results. ReSiE supports several optimisation backends and can minimise or maximise individual objectives. Parameter studies can also include global sensitivity analysis based on polynomial chaos expansion and Sobol indices, as well as local one-at-a-time sensitivity analysis.

Parameter-study results can be exported to CSV files and visualised using multiple plots. Calculations can use Julia threads where supported, and improved interruption handling preserves available results when a study is stopped. The release also includes new examples and scenarios demonstrating parameter variation, component-size optimisation and sensitivity analysis.

The latest release can be found here and details are available in the documentation of the QuaSi project.

We have released version 0.14.0 of our energy system simulation engine ReSiE. This release focuses on implementing the calculation of economic and emissions-related results of a simulation. New input parameters and profiles allow for customizing the simulation to capture relevant parameters, such as investment costs, fuel or electricity costs, emission factors relating to grid usage, and many more. The economic results are calculated by a method derived from the German standard VDI 2067.

Emissions are calculated including embodied emissions, if related input parameters are given. This makes the simulation suitable for optimisation and parameter variations with costs and emissions in the objective function. The results are output in plots showing i.e. the yearly cashflows, and optionally CSV output and a summary of results in text form.

The latest release can be found here and details are available on the documentation of the QuaSi-Projekt.

We have released version 2.16 of our building energy demand simulation tool GenSim. This release focuses on updating the underlying simulation engine EnergyPlus™, via intermediary framework OpenStudio, to the newest version and on making GenSim ready to be integrated into a larger ecosystem of tools. The used OpenStudio version has been updated to 3.10, which in turn uses EnergyPlus™ version 25.1. The mechanism for reading the outputs from the simulation has been reworked and the auxiliary outputs in “Gebäudebilanz” (the building energy balance) have been refactored to use different output variables of EnergyPlus™. It is now also possible to import (some) IFC models in addition to OSM and IDF files. Furthermore it is no longer necessary to use DDY files for the automatic sizing of the heating and cooling systems, the new default behaviour uses the weather data that is already a required input.

The latest releases of GenSim can be found here and a user manual is available on the documentation of the QuaSi project.

We have released version 0.13.0 of our energy system simulation engine ReSiE. This release focuses on advanced options for control and operational behaviour, particularly as it relates to busses. New options are now available for controlling the precise priorities of inputs and outputs on a bus, including switching the priorities and the allowed energy flow depending on profiles. Further changes with this version include improvements in the calculation speed of geothermal collectors, a new component to better model power networks and changes that make it easier to accurately simulate large heat storages on a multi-year timescale.

The latest release can be found here and details are available on the documentation of the QuaSi project.

We have released version 0.12.0 of our energy system simulation engine ReSiE. This release introduces extended output options that allow energy and temperature flows between components connected via busses to be exported and visualised, enabling more detailed system analysis. It also adds new component models for solar thermal collectors (STC) and seasonal thermal energy storage (STES). Further improvements include enhanced heat pump modelling with multiple operation modes, new and more flexible control modules, and a complete rework of temperature handling across components and busses. In addition, numerous smaller improvements, scenario updates, and bugfixes make this release more robust and easier to use.

The latest release can be found here and details are available on the documentation of the QuaSi project.

We have released version 0.11.0 of our energy system simulation engine ReSiE. This release introduces a new CLI for performing simulations with ReSiE, which provides more information on the progress of a run, as well as improved performance when multiple runs are performed in succession. Another focus of the release are updates to the energy system component models, implementing detailed models for heat pumps, geothermal collectors and short-term thermal energy storage (STTES) also called buffer tanks. In addition, working with external profile data, for example weather files, has been improved.

The latest release can be found here and details are available on the documentation of the QuaSi project.

We have released version 0.10.0 of our energy system simulation engine ReSiE. This release reworks how time is handled in the input of the simulation and how time is formatted in the profiles used by the engine. These changes both increase usability by allowing users to specify time in a more human-readable way as well as helping to clarify what the output means. Other changes since the last release include an improved implementation of geothermal probes and improvements of the mechanism to handle different temperatures of components processing heat.

The latest release can be found here and details are available on the documentation of the QuaSi project.

We have released version 0.9.0 of our energy system simulation engine ReSiE. This release reworks how operational strategies, which are control mechanisms that extend beyond those covered by bus component, are implemented. In the new implementation components can be assigned control modules, that each control the operation of the component via defined callbacks. Multiple control modules can be combined in different ways to cover various use cases. Further improvements to this new implementation will likely follow in the future and will be based on the foundation laid with this update.

The latest release can be found here and details are available on the documentation of the QuaSi project.

Open source launch of SoDeLe for simple photovoltaics simulation

SoDeLe (loosely translated as “Solar simulation as easy as can be”) is an easy-to-use tool for calculating energy profiles of photovoltaic systems. It is based on the well-validated python-pvlib, but offers a user-friendly GUI based on Microsoft-Excel® (and a CLI with JSON input). SoDeLe can simulate PV systems with parameters from real PV modules and inverters with different orientations. Alternatively, preset standard modules and a constant DC-AC efficiency can be selected. The database of parameters contains more than 35,000 PV modules from various manufacturers. The simulation is based on a weather file, which can be either an EWP file (EnergyPlus® Weather File) or a .dat file from the German Weather Service (DWD).

The latest release can be found here and a short user manual is available within the README of the repository.

We have released version 0.8.0 of our energy system simulation engine ReSiE. This release builds on the changes of the previous release v0.7.0, which introduced a lot of new things in regards to how the energy flow and distribution works on busses. With v0.8.0 we finalise these changes and brought the simulation model of ReSiE more closely to a finished state as we envision it. There will be further changes and additional features down the line to address the current modelling challenges when working with district networks.

The latest release can be found here and details are available on the documentation of the QuaSi project.

We have released version 2.15b of our tool GenSim. This addendum to the latest full release contains various building types as parameter sets ready to be imported. On the basis of this typology new types and custom projects can be modeled more easily than before.

We have released version 0.7.0 of our energy system simulation engine ReSiE. This release was developed over some time and contains many internal changes to better support various energy systems and use cases we envision for the future. However we are not done with refactoring and continue to improve our engine to cover a wider range of use cases. Please note that ReSiE in general is still in an early stage and might not be suited for use in projects without consultation on the current capabilities and limitations.

The latest release can be found here and details are available on the documentation of the QuaSi project.

We have released version 2.15 of our tool GenSim that is now fully open source, including a graphical user interface (GUI) based on Microsoft-Excel® (currently available in German only, however the English version will follow soon). GenSim calculates the energy demand for heating, cooling and electric loads of an individual building as yearly high-resolution profiles. The underlying generic building model makes it possible to model any building type. For all necessary parameters, standard data sets for common building types are available directly in the GUI (focus currently on german standards). The Geometry can be defined using a simple generic approach or by importing an own geometry model. An individual building can thus be modelled quickly, which is necessary when modelling entire districts. GenSim uses EnergyPlus® v9 as the simulation engine to perform physics-based thermal building simulation based on the framework that OpenStudio® provides.

The latest release can be found here and a detailed user manual is available within the documentation of the QuaSi project.

For citation of this release, use the following DOI: https://doi.org/10.5281/zenodo.10200808