Development of a High-Temperature Industrial Heat Pump Model with a Novel Compressor Technology

The current global environmental crisis has resulted in increased efforts towards more efficient and sustainable industrial processes. High-temperature heat between 150 ◦C & 400 ◦C accounts for a major part of the energy demand in industrial processes. At the same time, large quantities of waste heat are unutilised at temperatures up to 200 ...

One-dimensional turbomachinery models for pumped thermal energy storage systems

The rise in temperature attributed to human CO2 emissions and the escalating energy needs of society necessitates the development of clean energy production. Solar and wind energy, both renewable sources, have emerged as cost-effective alternatives to conventional fossil fuel systems. They now account for a substantial portion of the world's...

Small Scale Pumped Thermal Energy Storage Modeling and Optimization

Variable green energy sources were sought to supply the growing demand for energy without impacting the environment. Wind and solar energy are at the forefront of the energy transition. However, their intermittent nature poses a challenge that necessitates the development of energy storage technologies. <br/>Several technologies were studied...

Impact of building renovation on the decarbonized European energy system

Currently, there are optimization models that are able of modeling building renovation, but their scope is limited only to the heating system. There are also models that consider interactions between different energy subsystems, but they lack the ability to simulate building renovation. Having those two things combined would be beneficial as the...

Heat production in Alkaline Capillary-Fed Water Electrolysis

This master thesis introduces a recently surfaced method to produce hydrogen and oxygen using alkaline water electrolysis. A hydrophilic porous diaphragm is used that can feed electrolyte laterally to two porous electrodes that are placed against it. Consequently, hydrogen and oxygen are produced directly at the electrodes without any bubble...

Optimizing the energy performance of industrial refrigeration plants using digital twins

Industrial refrigeration systems are known to consume approximately 17% of electrical energy, a figure that is projected to rise in the future. This high energy consumption contributes to global warming and environmental degradation since conventional sources of energy are typically utilized for electricity generation. Moreover, the energy...

Design of a Heat Exchanger with Thermal Storage using PCM

Energy efficiency is a key goal for the Quooker system. To further increase the energy efficiency of the Quooker system, this study investigates a possible heat integration system where the waste heat from the refrigeration cycle for chilled drinking water is implemented to preheat water before entering the boiling water reservoir.<br/>Due to...

Boiling Heat Transfer with Nanofluids: An Experimental Study

Recent advancements in the field of nanotechnology have proven to offer viable alternatives for energy production, transport, and storage. As far as thermal energy is concerned, nanofluids have emerged as a novel method to enhance heat transfer. Indeed, nanofluids exhibit superior thermal capabilities, which may be able to meet the requirement...

Multiscale reactor modelling of the influence of substituting natural gas with hydrogen in a direct reduced iron (DRI) plant

At the moment, Tata Steel emits 12.6 Mt CO2 per year while producing 7.2 Mt steel per year. To reduce these emissions, Tata Steel has decided to replace the blast furnaces with direct reduced iron (DRI) plants in combination with reducing electrical furnaces. The DRI plants will first operate with a 100% natural gas feed. Whenever green hydrogen...

Heat Transfer Correction Modelling for RANS Simulations on Rough Surfaces

The Nuclear Research and consultancy Group (NRG) performs CFD simulations to improve the safety of nuclear installations and conducts research leading to new computational methods. One of the problems encountered in nuclear installations is that vital parts of the reactor, such as the fuel rod bundle, corrode over time. Corrosion leads to...

Integrated Internal Heat Sinks for passive cooling of photovoltaic modules

High operating temperatures harm photovoltaic (PV) modules. The increase in temperature of the cells leads to lower open circuit voltage and higher short circuit current ultimately leading to a lower power output due to a negative thermal coefficient. Hence, lowering the temperature of commercial crystalline silicon modules during their...