Design of moisture vapor pressure sensor for popcorn failure analysis in molding compound

Moisture absorbed by the hygroscopic polymers like molding compound and die-attach vaporizes during reflow lead to a high vapor pressure inside the electrical components lead to failure in the electrical device, named as popcorn failure. Popcorn failure in plastic encapsulated microcircuits has been a critical issue for electronic device...

Effects of pressure on a sequential cascade system for electrochemcial CO2 reduction: A mathematical model and preliminary design

Within the electricity driven conversion methods, electrocatalysis has been assessed to be the closest to commercialisation. This can only be realised, if the system efficiency is increased in terms of the reaction rate, onset potential and/or selectivity. Current research has shown that, apart from the more widely investigated routes to improve...

Characterization of a high pressure alkaline electrolyser with respect to product gas purity

Zero Emission Fuels B.V. (ZEF) is developing a microplant, which ultimately provides a pathway to produce a hydrocarbon in a sustainable manner. This microplant consists of several subsystems. One of which is an alkaline water electrolyser, in which water is split into oxygen and hydrogen under specific operating conditions.<br/>As a mixture of...

Characterisation of flow and bubble phenomena in a high pressure alkaline water electrolyser

Zero Emission Fuels B.V (ZEF) is currently in the process of designing and prototyping a sustainable methanol micro-plant, which captures water vapor and carbon dioxide from the atmosphere and uses those components to eventually produce methanol. In order to produce methanol, hydrogen is required which is produced from the captured water by...

Transient modeling and control of a small-scale and self-pressurized electrolysis system

Zero Emission Fuels B.V. (ZEF) is a start-up company developing a fully autonomous methanol synthesis micro-plant that will be energy driven by solar panels. The process implements an alkaline water electrolyzer, which supplies the methanol synthesis reactor with hydrogen. The electrolysis system includes a small-scale stack of cells and is...

Controlled Removal of Trace O2 in an H2 Environment of a Small-scale Electrolyser

Power-to-gas (PtG) technology represents a promising route in providing long-term energy security and involves pairing volatile sources of renewable energy (solar and wind energy) with alkaline water electrolysis (AWE) to create a wide range of products based on intermediate hydrogen gas for end-users across various industries such as in fuels,...

Modeling and Prediction of Pollutant Emissions in an Axial Turbine

The aviation market has seen a drastic rise in past decades, and is projected to follow a similar trend in the coming years. Stricter regulations and ambitious targets have been framed to effectively curtail the rise in emissions due to this surge in aviation. A multi-fuel blended wing body aircraft is being developed in TUDelft, with the goal...

Steering product formation In high-pressure anaerobic systems: The effect of elevated pCO2 on the degradation of glucose and glycerol by a mixed culture

Biogas is the well-known product of Anaerobic Digestion (AD), but nowadays, the intermediate products (volatile fatty acids - VFAs) of anaerobic metabolism have gained increasing attention inside the “carboxylate platform”. However, steering and optimizing the process for selective metabolite production is still an unraveled task inside this...

Quality of the integral aircraft engine MRO chain: A case study on the Low and High Pressure Compressors at KLM Engineering & Maintenance Engine Services

This research presents a model to estimate the influence of the variance of the quality of repair steps on the EGT Margin within the serviceable limits of the overhauled modules. This model is created using literature and a single case study conducted at KLM Engineering &amp; Maintenance Engine services (KLM E&amp;M ES). The model is tested...

Electrochemical Reduction of Carbon Dioxide: Modeling the electrochemical conversion of CO₂ to Formic Acid under high pressure

Due to rising concerns about climate change, a lot of research is currently underway with respect to the development of new technologies which can contribute to the decline of atmospheric CO₂, and will allow further penetration of renewables into the energy mix. A promising technology which is currently actively researched is the...

Simulations for an expanding gas jet with Joule-Thomson cooling

This study was aimed at improving the accuracy of the model predictions for the minimum fluid and inner wall temperatures for cold, low-pressure start-up of wells that produce oil or gas. Due to the large pressure drop over the well head choke, the so-called Joule-Thomson cooling will give a very low temperature of the<br/>expanding gas jet. Low...

Cryogenic propellant tank pressurization

To launch a rocket to the edge of space using a pressure fed rocket system with liquid oxygen as propellant, you need to know exactly how much pressurant gas (helium) you need to take along. In this thesis a practical investigation on cryogenic tank pressurization is conducted together with DARE. The measurement results are used to validate...

A Numerical Study into the Effect of Optimised Profiled End-Wall Design on High Pressure Turbine Performance

In order to provide further improvements in thermal efficiency, engine designers are trying to optimise one of the components of the engine that has to endure the most severe conditions: the High Pressure Turbine. Furthermore, from a cost perspective, turbine designers are constantly trying to reduce the number of blades in the turbine which...

Design of a reefer cleaning device

The Nomad is a reefer container box cleaning device, to be used by cleaning employee at a container cleaning site such as Van Doorn B.V. The Nomad’s dimensions are standardised to fit within every reefer container box. It is set up out of three main components: The cleaning system, the cleaner and the docking station; each with its own distinct...

Accommodating the Green Gas Infrastructure for Road Traffic: A feasibility and conceptual design study of a new distribution system for (Bio-)CNG

The emergence of green gas is a promising development within the Dutch gas market. Green gas is biogas with natural gas quality and can lead to a significant (up to 70%) greenhouse gas reduction. It therefore contributes to several sustainable energy targets and might partly solve some economical and geopolitical issues within the gas market....

Hogedrukstralen op grote waterdiepten

In de Arabische zee moet HAM (Hollandsche Aanneming Maatschappij) kabels en leidingen over de zeebodem leggen. Hierbij moet een richel van kleimateriaal op 3000 m waterdiepte gepasseerd worden. De steilheid van deze richel is zodanig dat de leidingen breken als deze over de richel gelegd worden. Door deze richel wordt een sleuf gebaggerd om de...