Master Thesis by Emmanouil Katsigiannis, March 2015
Abstract – Towards the mitigation of climate chance and the reduction of green-house-gas emissions,
cities, nowadays, persistently tend to increase the power generated from renewable energy
resources. The penetration of renewables, however, implies several side-effects. Renewable
energy sources such as wind and solar energy constitute inflexible energy sources, which are
difficult to manage within an energy system. In addition, the rapid urbanization and its sideeffects
in the energy sector, further deteriorates the situation. This combination of increasing
energy demand with inflexible ways to produce energy motivates researchers to come up with
innovative and effective solutions in order to deal with such challenging issue. Such solutions
constitute the concept of smart cities.
One way to deal with such mater is to explore possible means of energy storage in smart cities.
Considering that the building sector currently occupies a fundamental role to cities, the
investigation of available capacitances in the existing building stock would be a plausible
target. Moving towards this direction, it is essential to search for applicable technologies that
can create capacitances for energy storage in buildings. Subsequently, a city scale application
of such patterns could contribute more effectively to the mitigation of peak demands. .
The current project deals with the issue of peak load management by utilizing the existing
capacities of a building with respect to its heat demand. Such capacities are “hidden” in
buildings’ passive behaviour, which is directly linked with their construction.
In order to assess buildings thermal behaviour, an existing building case is implemented in a
building simulation tool named IDA ICE. Initially, this building model is validated with the
full-scale measurements conducted.
Based on the validated model, parameter variation with three different scenarios is carried out
in order to evaluate the possibility of short-term energy storage, which indicates the flexibility
potential of the examined building model. The first scenario is a proof of concept which
examines the effectiveness of the material used as thermal mass by comparing a heavy and a
light weight construction. The second scenario investigates how accurately the simulation of
building’s thermal behaviour is. Finally, the third scenario uses a preheating pattern in order to
quantify the time interval of the evaluated flexibility potential. Based on the outcome of the
project, it could be highlighted that heavy weight construction is proved as more effective for
storing amounts of heat within its thermal mass. Additionally, a heavily constructed building
combined with a preheating pattern could lead to significant a heat storage, which could
accomplish a significant peak load shifting.MSc Thesis Emmanouil Katsigiannis s121405 (final submitted)