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Experimental assessment of square-wave spatial spanwise forcing of a turbulent boundary layer

Knoop, Max W. (author), Hartog, F.H. (author), Schrijer, F.F.J. (author), van Campenhout, O.W.G. (author), van Nesselrooij, M. (author), van Oudheusden, B.W. (author)

We present an experimental realisation of spatial spanwise forcing in a turbulent boundary layer flow, aimed at reducing the frictional drag. The forcing is achieved by a series of spanwise running belts, running in alternating spanwise direction, thereby generating a steady spatial square-wave forcing. Stereoscopic particle image velocimetry...

journal article 2024

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Characterization and Design of Circular Binders

Hendrikse, Hans C. (author), El Khallabi, Hamza (author), Hartog, Thomas (author), Varveri, Aikaterini (author), Tolboom, Anthon (author)

The concept of a circular economy, where waste materials are transformed into valuable resources, is gaining increasing attention. However, many waste streams are difficult to recycle due to their mixed composition and broad molecular distribution. This paper explores the potential of repurposing mixed materials, specifically focusing on...

journal article 2023

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Heat losses in ATES systems: The impact of processes, storage geometry and temperature

Beernink, S.T.W. (author), Hartog, Niels (author), Vardon, P.J. (author), Bloemendal, Martin (author)

The technical and economic success of an Aquifer Thermal Energy Storage (ATES) system depends strongly on its thermal recovery efficiency, i.e. the ratio of the amount of energy that is recovered to the energy that was injected. Typically, conduction most strongly determines the thermal recovery efficiency of ATES systems at low storage...

journal article 2023

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Experimental Investigation into the Drag Performance of Chevron-Shaped Protrusions in Wall-Bounded Turbulence

Carrasco Grau, J. (author), van Campenhout, O.W.G. (author), Hartog, F.H. (author), van Nesselrooij, M. (author), Baars, W.J. (author), Schrijer, F.F.J. (author)

Chevron-shaped protrusions have been proposed in the literature for turbulent skin friction reduction. However, there is no consensus on the performance of this passive flow control technique; both an increase and a decrease in drag have been observed in previous studies. There is also no experimental evidence to support the working mechanism...

journal article 2023

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Field Testing of a Novel Drilling Technique to Expand Well Diameters at Depth in Unconsolidated Formations

van der Schans, M.L. (author), Bloemendal, Martin (author), Robat, Niels (author), Oosterhof, Ate (author), Stuyfzand, Pieter Jan (author), Hartog, Niels (author)

Larger well diameters allow higher groundwater abstraction rates. But particularly for the construction of wells at greater depth, it may be more cost-efficient to only expand the borehole in the target aquifer. However, current drilling techniques for unconsolidated formations are limited by their expansion factors (<2) and diameters (&lt...

journal article 2022

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Aquifer thermal energy storage triplet: Moving towards self-sufficient space heating and cooling

van Esch, M.S. (author), Bloemendal, Martin (author), Hartog, Niels (author), Vardon, P.J. (author)

Aquifer Thermal Energy Storage (ATES) is mostly used to store heat and cold in groundwater at relatively low temperatures for heating and cooling buildings. These systems emit 3-4 times less CO2 when compared to gas heating, but still require substantial amounts of electricity to run due to the use of a heat pump ( 60%). In typical ATES systems...

abstract 2022

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Maximizing the use of aquifer thermal energy storage systems in urban areas: effects on individual system primary energy use and overall GHG emissions

Beernink, S.T.W. (author), Bloemendal, Martin (author), Kleinlugtenbelt, Rob (author), Hartog, Niels (author)

Low temperature (<25 °C) Aquifer Thermal Energy Storage (ATES) systems have a world-wide potential to provide low-carbon space heating and cooling for buildings by using heat pumps combined with the seasonal subsurface storage and recovery of heated and cooled groundwater. ATES systems increasingly utilize aquifer space, decreasing the...

journal article 2022

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Improving the Efficiency of District Heating and Cooling Using a Geothermal Technology: Underground Thermal Energy Storage (UTES)

Chicco, Jessica Maria (author), Antonijevic, Dragi (author), Bloemendal, Martin (author), Cecinato, Francesco (author), Goetzl, Gregor (author), Hajto, Marek (author), Hartog, Niels (author), Mandrone, Giuseppe (author), Vacha, Damiano (author), Vardon, P.J. (author)

For efficient operation of heating and cooling grids, underground thermal energy storage (UTES) can be a key element. This is due to its ability to seasonally store heat or cold addressing the large mismatch between supply and demand. This technology is already available and there are many operational examples, both within and outside a...

conference paper 2022

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Novel ATES triplet system for autarkic space heating and cooling

Bloemendal, Martin (author), van Esch, M.S. (author), Vardon, P.J. (author), Pape, J. J. (author), Hartog, N. (author)

Governments and companies have set high targets in avoiding CO2 emissions and reducing energy. Aquifer Thermal Energy Storage (ATES) systems can contribute by overcoming the temporal mismatch between the availability of sustainable heat (during summer) and the demand for heat (during winter). Therefore, ATES is an increasingly popular...

journal article 2022

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Towards Sustainable Heat Supply with Decentralized Multi-Energy Systems by Integration of Subsurface Seasonal Heat Storage

van der Roest, E. (author), Beernink, S.T.W. (author), Hartog, Niels (author), van der Hoek, J.P. (author), Bloemendal, Martin (author)

In the energy transition, multi-energy systems are crucial to reduce the temporal, spatial and functional mismatch between sustainable energy supply and demand. Technologies as power-to-heat (PtH) allow flexible and effective utilisation of available surplus green electricity when integrated with seasonal heat storage options. However, insights...

journal article 2021

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Will Algorithms Blind People? The Effect of Explainable AI and Decision-Makers’ Experience on AI-supported Decision-Making in Government

Janssen, M.F.W.H.A. (author), Hartog, M.W. (author), Matheus, R. (author), Ding, Aaron Yi (author), Kuk, George (author)

Computational artificial intelligence (AI) algorithms are increasingly used to support decision making by governments. Yet algorithms often remain opaque to the decision makers and devoid of clear explanations for the decisions made. In this study, we used an experimental approach to compare decision making in three situations: humans making...

journal article 2020

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Transforming ATES to HT-ATES

Bloemendal, Martin (author), Hartog, Niels (author), Beernink, Stijn (author)

poster 2019

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ATES systems performance in practice: analysis of operational data from ATES systems in the province of Utrecht, The Netherlands

Beernink, Stijn (author), Hartog, Niels (author), Bloemendal, Martin (author), van der Meer, Marlous (author)

Energy consumption for space heating and cooling of buildings can be decreased by 40-80% by use of Aquifer Thermal Energy Storage (ATES). ATES is a proven technique, however, it is not known how efficient currently operating systems are recovering stored energy from the subsurface and how this can be determined with available data. Recent...

conference paper 2019

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Transforming Ates To Ht-Ates, Insights From Dutch Pilot Project

Bloemendal, Martin (author), Beernink, Stijn (author), Hartog, Niels (author), van Meurs, Bart (author)

Aquifer Thermal Energy Storage (ATES) systems combined with a heat pump save energy for space heating and cooling of buildings. In most countries the temperature of the stored heat is allowed up to 25-30°C. However, when heat is available at higher temperatures (e.g. waste heat, solar heat), it is more efficient to store higher temperatures...

conference paper 2019

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Analysis of the impact of storage conditions on the thermal recovery efficiency of low-temperature ATES systems

Bloemendal, Martin (author), Hartog, Niels (author)

Aquifer thermal energy storage (ATES) is a technology with worldwide potential to provide sustainable space heating and cooling using groundwater stored at different temperatures. The thermal recovery efficiency is one of the main parameters that determines the overall energy savings of ATES systems and is affected by storage specifics and site...

journal article 2018

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Water quality considerations on the rise as the use of managed aquifer recharge systems widens

Hartog, Niels (author), Stuyfzand, Pieter Jan (author)

Managed Aquifer Recharge (MAR) is a promising method of increasing water availability in water stressed areas by subsurface infiltration and storage, to overcome periods of drought, and to stabilize or even reverse salinization of coastal aquifers. Moreover, MAR could be a key technique in making alternative water resources available, such as...

journal article 2017

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Observations and prediction of recovered quality of desalinated seawater in the strategic ASR project in Liwa, Abu Dhabi

Stuyfzand, Pieter Jan (author), Smidt, Ebel (author), Gerardus Zuurbier, Koen (author), Hartog, Niels (author), Dawoud, Mohamed A. (author)

To be able to overcome water shortages, Abu Dhabi Emirate started an Aquifer Storage and Recovery (ASR) project with desalinated seawater (DSW) as source water near Liwa. It is the largest DSW-ASR project in the world (stored volume ~10 Mm³/year), and should recover potable water for direct use. DSW is infiltrated into a desert...

journal article 2017

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Short-term mudflat dynamics drive long-term cyclic salt marsh dynamics

Bouma, T. J. (author), van Belzen, J. (author), Balke, T. (author), van Dalen, J.H. (author), Klaassen, P. (author), Hartog, A. M. (author), Callaghan, D.P. (author), Hu, Z. (author), Stive, M.J.F. (author), Temmerman, S. (author), Herman, P.M.J. (author)

Our study aims to enhance process understanding of the long-term (decadal and longer) cyclic marsh dynamics by identifying the mechanisms that translate large-scale physical forcing in the system into vegetation change, in particular (i) the initiation of lateral erosion on an expanding marsh, and (ii) the control of seedling establishment in...

journal article 2016

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After the boom: Evaluation of Dutch ates-systems for energy efficiency

Bloemendal, Martin (author), Hartog, N (author)

Aquifer thermal energy storage (ATES) is a technology to sustainably provide space heating and cooling. Particularly in The Netherlands the number of ATES systems has grown rapidly in the past decade, often with the (re)development of urban areas. To meet objectives for greenhouse gas emission reduction the number of ATES systems is expected and...

conference paper 2016

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Early motor learning changes in upper-limb dynamics and shoulder complex loading during handrim wheelchair propulsion

Vegter, R.J.K. (author), Hartog, J. (author), De Groot, S. (author), Lamoth, C.J. (author), Bekker, M.J. (author), Van der Scheer, J.W. (author), Van der Woude, L.H.V. (author), Veeger, H.E.J. (author)

Background To propel in an energy-efficient manner, handrim wheelchair users must learn to control the bimanually applied forces onto the rims, preserving both speed and direction of locomotion. Previous studies have found an increase in mechanical efficiency due to motor learning associated with changes in propulsion technique, but it is...

journal article 2015