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Bulstra, Kasper (author)The main problem in density-based two-fluid optimization is the fact that the two fluids often mix in optimal designs. Therefore, state-of-the-art two-fluid heat exchanger optimization includes non-mixing constraints. However, the current non-mixing constraints can only impose a constant wall-thickness between the two fluids. Depending on the...master thesis 2023
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Hoogerdijk, Tom (author)Hydrogen is seen as a potential energy carrier for the next generation of aircraft that will be more climate-friendly than the previous generation of kerosene-powered aircraft. Two types of hydrogen-based propulsion systems are currently foreseen for such aircraft: hydrogen combustion and hydrogen fuel cell. In addition to producing useful...master thesis 2023
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Scoccimarro, Antonio (author)Hydrogen fuel cells are set to play an important role in decarbonizing the aviation sector. They operate at higher efficiencies than turbine engines, but their low operating temperature requires a dedicated thermal management system. The added drag, weight and parasitic power of such a system has a high impact on aircraft performance and its...master thesis 2023
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van Heyningen, Maarten (author)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...master thesis 2023
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van den Engel, P.J.W. (author), Malin, Michael (author), Venkatesh, Nikhilesh Kodur (author), de Araujo Passos, L.A. (author)This research evaluates the performance of a Phase Change Material (PCM) battery integrated into the climate system of a new transparent meeting center. The main research questions are: a. “Can the performance of the battery be calculated?” and b. “Can the battery reduce the heating and cooling energy demand in a significant way?” The first...journal article 2023
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Wang, J. (author), Yan, Xin ping (author), Boersma, B.J. (author), Lu, Ming jian (author), Liu, Xiaohua (author)Printed circuit heat exchangers (PCHE) are designed to improve heat recovery and energy saving in supercritical CO<sub>2</sub> (S-CO<sub>2</sub>) power cycles. In the current study, a modified channel PCHE is proposed based on the regular straight channel and a zigzag channel. The thermal–hydraulic performance of four different types of PCHE...journal article 2023
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Noel, L.F.P. (author), Maute, K. (author)Solving conjugate heat transfer design problems is relevant for various engineering applications requiring efficient thermal management. Heat exchange between fluid and solid can be enhanced by optimizing the system layout and the shape of the flow channels. As heat is transferred at fluid/solid interfaces, it is crucial to accurately resolve...journal article 2023
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Välikangas, Turo (author), Folkersma, M.A.M. (author), Dal Maso, Miikka (author), Keskitalo, Tuomo (author), Peltonen, Petteri (author), Vuorinen, Ville (author)In the past, fin-and tube heat exchanger (FTHE) tube pattern ratios have been largely based on ad-hoc design principles. Here, we investigate the optimal tube arrangements for a FTHE with plain fins in marine environments represented by two different air types; one for unfiltered air with high condensation rate and one for clean dry filtered...journal article 2022
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Amoiridis, O. (author), Zarri, A. (author), Zamponi, R. (author), Pasco, Y. (author), Yakhina, G. (author), Christophe, J. (author), Moreau, S.A.N. (author), Schram, C. (author)Sound emissions of an automotive engine cooling system are studied using both single-microphone directivity measurements and a rotating beamforming technique. These measurements provide reference acoustic data on such a system and some new understanding of the effect that the radiator induces on the distribution of sound sources. Indeed, the...journal article 2022
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Gradl, P.R. (author), Cervone, A. (author), Gill, E.K.A. (author)Additive Manufacturing (AM) offers new design and manufacturing opportunities of thin-wall microchannel heat exchangers for aerospace and industrial applications. Laser Powder Directed Energy Deposition (LP-DED) is an AM process providing large scale manufacturing of thin-wall microchannel heat exchangers. Successful industrialization of the LP...journal article 2022
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Gradl, P.R. (author), Cervone, A. (author), Colonna, Piero (author)Heat exchangers for use in propulsion applications are very critical components because they must be efficient, compact and light and often operate with working fluids at extreme temperatures or pressures or both. Various components and systems use heat exchangers such as combustion chambers of gas turbines and internal combustion engines, fuel...conference paper 2022
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Dimitriou, Neofytos (author)One of the biggest threats that humanity is currently facing is the climate change. The amount of greenhouse gases emissions and specifically the amount of CO2 in the atmosphere has increased and is projected to increase even more in the next years. One possible solution is the use of supercritical CO2 as an alternative working fluid in power...master thesis 2021
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Prot, T.J.F. (author), Korving, L. (author), Dugulan, A.I. (author), Goubitz, K. (author), van Loosdrecht, Mark C.M. (author)The presence of soluble iron and phosphorus in wastewater sludge can lead to vivianite scaling. This problem is not often reported in literature, most likely due to the difficult identification and quantification of this mineral. It is usually present as a hard and blue deposit that can also be brown or black depending on its composition and...journal article 2021
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Combe, Christopher (author)The global climate agreement signed in Paris in 2015 sets the goal of limiting global warming, which is essential of saving the planet for future generations. The energy transition from a fossil-fuel living to a sustainable society depends on the technological development of using the renewable energy sources on earth. Wind and solar are common...master thesis 2021
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Cragg, Patrick (author)Traditional fuel system designs do not provide the combination of sucient cooling and low system weight at the Mach 5+ range. Thus, if currently available non-cryogenic propellants are to be employed, an additional heat sink source beyond a simple physical heat sink is required to meet the regenerative cooling demand. The endothermic...master thesis 2021
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Landuyt, Wim (author), Somers, Korneel (author), Van de Sype, Onno (author), Van Santvliet, Pieter (author)A tiny house is a building for permanent human habitation that is specifically designed to have a limited ground surface. The tiny house design discussed in this report has a strong focus on circularity, sustainable material usage, smart systems, and affordability. To achieve an overall self-regulating and ecological concept, the aim is to...student report 2021
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Tao, Xuan (author), Infante Ferreira, C.A. (author)High concentration NH3/H2O is suitable for Kalina cycles used for the recovery of low grade heat. Plate heat exchangers (PHEs) are compact and reduce the charge of working fluid. This work investigates the absorption of NH3/H2O in a PHE, which has a weight concentration of 96%. Being different from normal absorption systems, the concentration...conference paper 2021
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Pinel, I.S.M. (author), Biskauskaite, R. (author), Palova, E. (author), Vrouwenvelder, J.S. (author), van Loosdrecht, Mark C.M. (author)Temperature change over the length of heat exchangers might be an important factor affect-ing biofouling. This research aimed at assessing the impact of temperature on biofilm accumulation and composition with respect to bacterial community and extracellular polymeric substances. Two identical laboratory-scale plate heat exchanger modules...journal article 2021
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Kura, Tomasz (author), Fornalik-Wajs, Elzbieta (author), Wajs, Jan (author), Kenjeres, S. (author)The jet impingement phenomenon plays an important role among the heat transfer intensification methods. Very often its application and analyses refer to simple flat surfaces, while there is a lack of information in the literature for cases addressing curved surfaces. In the present work, the single jet impingement on the non-flat (concave and...journal article 2021
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Jagirdar, Mrinal (author), Lee, Poh Seng (author), Padding, J.T. (author)Internally cooled and heated desiccant-coated heat and mass exchangers (ICHDHMX) driven by low-grade heat are very attractive owing to their energy-saving potential, especially for applications where substantial moisture removal (such as air-conditioning) is a necessity. In this paper, we derive equations for the performance of an ideal...journal article 2021