Seasonal Underground Heat Storage

This study aims to assess the role and need of (seasonal) thermal energy storage in the next generation renewable, and sustainable central heating systems for the built environment in the Netherlands. Specifically, the neighbourhood "Karwijhof" in the city Nagele which is transitioning to a collective renewable district heating network...

Absorption of ammonia in an ammonia - ionic liquid solution: A detailed experimental and numerical study of the absorption process

Excessive consumption of non - renewable resources in the recent times has negative effects on the environment, one of the important of which include global warming. This suggests an urgent need for adaption to the sustainable use of the resources, for which the thermal technologies show a lot of scope. Absorption heat pump is a type of heat...

Potential of polymer sewage heat exchangers with enhanced thermal properties

Buildings contribute to 30% of global CO₂ emissions and consume 40% of the global energy supply (Yang et al., 2014). Heating and cooling requirements of the buildings form the major part of the energy consumption in buildings (Culha et al., 2015). Thus to solve this problem, one of the solutions currently being<br/>looked at is to...

A study on the ORC for OTEC applications: Performance analysis for a changed configuration

This thesis project aims to enable Bluerise to create a 3 [MW] plant for their OTEC system. The current model and lab setup used to create insight into the systems working mechanisms are based on a Kalina cycle configuration. This method uses a working fluid mixture of water and ammonia. After evaporation, the liquid and vapor are separated and...

Rate-Based Modelling of Plate-Packed Heat Integrated Distillation Columns

TechnipFMC is pushing innovations to reduce the emissions of ethylene plants separations. This development is also driven by customer demands. They face increasingly strict legislation on \ce{CO2} emissions. Separation in distillation columns is one of the major energy intensive unit operations in an ethylene plant, and increasing their...

Flow visualization of downward condensing ammonia in a gasketed plate heat exchanger

Ocean Thermal Energy Conversion (OTEC) uses the temperature difference between the surface and deep layers to generate electricity. The temperatures in the ocean hardly vary between day and night or between the seasons, which ensures a very constant energy production with OTEC. In order for OTEC to compete with the current forms of energy...

Fault Detection and Diagnosis of Industrial Heat Pumps of GEA B.V.

Heat pumps represent an effective technology to convert electrical energy to thermal energy through the expansion and compression of a refrigerant. Heat pumps are becoming increasingly more efficient<br/>which decreases energy consumption. However as heat pumps are getting increasingly more efficient, complexity is also increasing which leads to...

Impact of turbine performance on the operating conditions of a 10 MW OTEC plant

One of the world greatest priorities is to move to a sustainable world, while the global energy demand is growing. Ocean Thermal Energy Conversion (OTEC) is a base-load renewable electricity technology that has the potential to contribute to a sustainable power supply on a world-wide scale. OTEC creates sustainable power utilizing the...

Techo-economic investigations of a solar driven ORC-sorption system for combined cooling, heating and power

The rapid growth of power systems supplied by sustainable energy sources and the attempt towards the decrease of CO₂ emissions has resulted in the increase of decentralized energy systems over the last decades. Tri-generation systems utilizing an Organic Rankine Cycle (ORC) can offer a reliable alternative towards that direction. In particular,...

Implementation and optimisation of thermal storage in existing, large-scale district heating networks

District heating networks (DHN) are frequently considered an alternative heating solutions in the energy transition. The implementation of thermal storage in large-scale, existing, district heating networks was researched in this study. Thermal storage was found to enable the incorporation of sustainable heat sources and optimise fuel usage in...

Wet compression with a twin screw compressor prototype

The main objective of this study was to develop a quick model for an oil free twin screw compressor. The computational time of the model was to be kept as low as possible so that the model could be used for quick estimations and optimizations of the process. This was done by using a simple geometry focusing on the volume curve and port sizes,...

Phase Change Material Slurry for Medium Temperature Heat Storage: Numerical comparison between a slurry model and a shell and tube packed bed model

Concentrated solar technologies have been successfully used to collect solar irradiance and transform it into useful heat for electricity generation. A problem in these systems is often that a mismatch between input and output is present due to variable solar irradiance and energy demand. To compensate for this mismatch storage is utilized to...

Air-conditioning with TBAB clathrate hydrate slurry as secondary loop refrigerant

The demand of energy increases steadily due to the growing global population and the increasing living standard of emerging markets. The increasing energy demand and reduction of greenhouse gasses require a significant increase of renewable energy sources and energy efficiency of buildings. Also, the increasing degree of renewable energy sources...

Invloed van toevoegingen aan het werkmedium op warmteoverdracht in een warmtewisselaar

Bluerise has developed a system that uses cold seawater to cool down a fresh water loop. This loop is used for fresh water production. The goal of this study is to improve the overall heat transfer coefficient of the working medium in this system by at least 5%, which will also reduce its size. The overall heat transfer can be improved by adding...

Air conditioning with TBAB clathrate hydrate slurry as distribution fluid

At the moment, the worldwide demand for air conditioning is rapidly growing, and it is expected to exceed the demand for space heating by the 2060s. However, traditional refrigerants such as CFCs and HCFCs are regulated or phased out by the Montreal and Kyoto protocol. Secondary loop refrigerant systems use less of these harmful refrigerants...

Advanced NH3 based absorption refrigeration cycles: Modelling of the ionic liquid based double-effect cycles

Absorption refrigeration cycles are energy saving as they can be driven by waste heat instead of electricity. By doing so, they reduce the use of fossil fuels, resulting in a reduction of emissions. However, many challenges exist for the traditional working fluids of the cycle, such as the crystallization problem of the water-lithium bromide...