Project UHI
in collaboration with
the city of Fribourg

a student from the HEIA-FR uses CitySim Pro
to investigate ways to mitigate Urban Heat Islands (UHI)
and improve urban comfort in summer

A teaser
CitySim Pro

showing the use of CitySim Pro
from 3D models to full physical models
and their energy consumption/production

Successful PhD thesis

urban comfort and evapotranspiration
of plants, grass and roofs in CitySim Pro
congratulations Dr Coccolo!

swiss competence center
in energy research

we provide our product CitySim Pro
to the SCCER Future Energy Efficient Buildings and Districts
with technical support, constant updates and improvement in its functionalities

kaemco provides software for consulting in energy and urban physics

kaemco is a spin-off company of the Solar Energy and Building Physics Laboratory (LESO-PB) of EPFL. Founded in 2013 by Dr Jérôme KAEMPF - senior researcher at the Idiap Research Institute - kaemco aims at adding the dimensions of energy and comfort to 3D geometrical data.


New eco-districts scenarios can be evaluated and optimized for their energy consumption, carbon dioxide or renewable energy production


Installation, maintenance, documentation and training services for the users of the urban energy simulation software CitySim

Urban retrofitting

Retrofitting in the urban context reveals many challenges like dealing with heritage buildings and complex urban layouts for the integration of renewable energy sources


Building Integrated Photovoltaics (BIPV)

Estimation of the solar potential and electricity production considering obstructions from:

  • surrounding buildings (near-field)
  • mountains (far-field)

Heating and Cooling

Estimation of the heating and cooling power demands considering:

  • passive solar gains through glazing
  • fixed and moveable solar shading (blinds)
  • internal heat gains due to occupants' activities

Radiant comfort and Urban Heat Island (UHI) effect

Estimation of the surfaces' temperature considering:

  • construction materials
  • solar reflectance
  • infrared emissivity
  • evapo-transpiration


CitySim Pro

Graphical User Interface (GUI) prepared by kaemco and built on top of the open-source CitySim Solver initially developed at EPFL.

CitySim aims at the simulation and optimisation of the sustainability of urban settlements by predicting energy fluxes at scales from a small neighbourhood to an entire city.


Set of Grasshopper components prepared by Giuseppe Peronato for interfacing with CitySim built on top of the CitySim Solver developed at EPFL.

GHCitySim is free to use. You are kindly invited to acknowledge its use by citing the related publication in a research paper you are writing, reports, and/or other applicable materials.


Graphical User Interface (GUI) maintained by kaemco and built on top of the RADIANCE Solver developed at LBNL and EPFL.

Geronimo is a user-friendly software for architects and lighting designers conceived to perform daylighting calculations. Geronimo avoids the classical command-line usage of RADIANCE through a simple interface that can be adapted to users' skills. The latest version of the software can be downloaded free of charge.


Jérôme Kämpf Founder and Managing Partner

Jérôme is Physicist and responsible of the general management of the company together with R&D ...

jerome.kaempf at

Jacques Oguey Administration Manager

Jacques is Hotelier-Restaurateur and responsible of administrative tasks within the company...

jacques.oguey at

Susan Knodel GIS Specialist

Susan is Architect and her field of activity is the consulting for city representatives...

susan.knodel at

Anthony Di Blasi Database Specialist

Anthony is Mechanical Engineer and his field of activity is the data management for simulation...

anthony.diblasi at

Pierre Van Brockhoven Research intern & Master student

Pierre is an Engineer in Sustainable Energy. He simulates the case-study of Yverdon in the framework of the SolCAD project...

pierre.vanbrockhoven at

Maximilien Clappier Research intern & Master student

Maximilien is Physicist and specializes in energy. He further develops models for District Heating Networks...

maximilien.clappier at

Actual and past projects

(in progress)

The project aims to evaluate the opportunities and limitations of solar thermal panels coupled with storage for district heating in Switzerland. Four complementary approaches are used: a) a large-scale archetypal and mapping approach, b) a case study approach where particular systems are simulated in detail, c) a socio-economic analysis, and d) an approach based on experience sharing from a follow-up group of industrial partners.

Urban Heat Islands
(in progress)

Through this project, the city of Fribourg wishes to provide itself with a decision-making and communication tool to anticipate and raise awareness of the consequences of global warming on urban comfort and human health, on urban planning (nature in the city) and on consumption and renewable energy production.


The project studies potentials, opportunities and risks linked to an energy strategy that goes beyond considering single buildings. With the objective to compare the traditional building by building retrofit strategy with a new combined approach that has measures dedicated to a single building but also considers connecting them through district heating, integrating renewable energy and considering an energy and economic analysis.


The developed urban energy simulation framework will help collectivities, urban planners and stakeholders to evaluate the environmental impact of cities in a changing climate and to provide a basis for testing new urban energy retrofit scenarios.

CCEM-IDEAS4cities (completed)

In the project simulation models of urban energy hubs and urban microgrids for a cluster of buildings or city quarters will be developed and coupled to city energy models, which simulate the energy demand, generation, storage and management of the buildings in the city.

IEA SHC Task 50

Advanced Lighting Solutions for Retrofitting Buildings - Research and developments in the field of energy efficient lighting techniques encompassing daylighting, electric lighting and lighting controls combined with activities employing and bringing these techniques to the market can contribute significantly to reduce worldwide electricity consumptions and carbon dioxyde emissions.