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In the residential construction industry, the focus on energy efficiency and cost effectiveness has been gaining importance. In order to achieve these contradicting objectives, a shift towards a reduced complexity in building practices can be observed.
Within the HVAC sector, the Tempering method for space heating has received particular attention as an alternative way to heat museums and buildings worthy of preservation.
In spite of the simplified design, this space heating system is claimed to offer significant advantages in its present field of application.
This study evaluates the implementation of Tempering in the residential context. So far, there is no scientific research on the implementation of Tempering in energy efficient-dwellings.
This master thesis provides initial results on achievable heat flux values, the impact on heat generation efficiency, the inherent installation costs as well as the particular
consequences in terms of end energy consumption of the building as a whole. The findings are compared to the individual performances of well-established heat emission approaches.
By means of a numerical analysis and a case study on a real-case single-family home, it is found that the heat flux values of Tempering systems suffice for the implementation within buildings, which comply with the low-energy building standard. Comparing radiant walls, radiant floors and radiators, the inherent installation costs are lowest for Tempering and radiant floors. The impact on the end energy consumption depends largely on the utilised heat generation system. With a gas-condensing boiler, Tempering performs equal to the radiant systems. When a ground source heat pump system is installed, however, Tempering performs poorly and accounts for a significantly increased energy consumption. Radiator systems are found to be the most energy-efficient method for space heating in both cases.
In times of global climate change, it is increasingly important to investigate emissions and resource consumption of all machines and, if possible, to improve them. This includes within the transport sector car ferries.
In order to reduce the environmental impacts of car ferries, the electrification has penetrated into this sector, which has led to the world's first fully electric car ferry. One of the most important components to operate this ferry is the energy storage. Not only the battery storage of the ferry itself is needed, but also an onshore battery storage system is needed to support the electrical grid.
The present study examines how storage technologies and concepts can impact the environment considering the world's first all-electric car ferry, MF Ampere, which operates in Norway.
To examine this, the current onshore battery storage system is compared to a concrete sphere storage system. For this purpose, data from the first test run of this new storage technology, which was successfully carried out by the Fraunhofer Institute in 2016, is considered. Subsequently, a life cycle assessment of the two storage systems is carried out to compare the environmental impacts.
The concrete sphere storage system performs better for 15 of 17 impact categories compared to the existing onshore battery storage system. Depending on the impact category the impact reduction is about 2% to 8%.
Nevertheless, it is difficult to estimate how long the useful life and how good the efficiency of the concrete ball storage will be, since no system of this size has been tested yet. Also, the costs of the concrete sphere storage system have not been considered.
In this thesis the effect of dc voltage bias on the equivalent series resistance (ESR) of capacitors and especially ferroelectric dielectric ceramic capacitors (FDCC) is analysed. Further the influence of the dc biased ESR on the losses of capacitors is investigated. Also piezoelectric resonances (PR) occurring in FDCCs with applied dc bias and their influence on the losses are analysed.
Therefore a measurement circuit to measure the impedance and thus the ESR of capacitors in combination with a vector network analyser (VNA) is developed. Using the developed circuit the ESR of capacitors of different technologies is measured and their behaviour with dc bias is evaluated. The losses of an FDCC are measured in a power electronic (PE) circuit with a developed calorimetric measurement system (CMS). The influence of the PR is investigated by tuning the switching frequency of the PE system and thus the frequency of the capacitor current exactly into the PR. The measured losses are then compared to a calculation based on the capacitor current harmonics and the respective ESR.
The measurements show an increase of the ESR with dc bias for all measured FDCCs. The loss measurements show a significant increase of the losses in an FDCC if the current frequency matches the PR frequency. Consequently a decrease of the PE system's efficiency is measured. The loss calculations do not exactly match the measurements but there is a systematic deviation of the same order for all measurements.