Author
K. Sumathy
Bio: K. Sumathy is an academic researcher from University of Hong Kong. The author has contributed to research in topics: Air conditioning & Solar air conditioning. The author has an hindex of 17, co-authored 20 publications receiving 4489 citations.
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TL;DR: In this article, an optimum design has been outlined for a solar thermal water pump, both in terms of the amount of the working fluid to be loaded in the system and the optimum cooling coil area.
32 citations
TL;DR: In this paper, the performance of a solar water pump which works on the basis of vapour generated by a flat-plate solar collector of exposed area 1 m2 has been studied for three different discharge heads, namely 6, 8 and 10 m. The design and experimental results of the pump which entailed detailed calculations to obtain the optimal volumes of the vessels, are presented.
25 citations
TL;DR: In this paper, a solar-powered hybrid adsorption ice-maker with activated carbon fibre and methanol as the working pair is described and operation, and an optimum design has been outlined for a solar hybrid ad-sorption system employing an evacuated vacuum tube collector with an exposed area of 2 m2 as the heat source.
Abstract: This paper presents the description and operation of a solar-powered hybrid adsorption ice-maker with activated carbon fibre and methanol as the working pair. The analysis indicates that for the given amount of adsorbent/adsorbate, by adapting more adsorbers instead of conventionally used single adsorber bed, the performance of the adsorption system can be improved. Also, the results show that compared to the change in mass of the adsorbent, the amount of water in the tank influences the system performance to a greater extent. Hence, in the present work, an optimum design has been outlined for a solar hybrid adsorption system employing an evacuated vacuum tube collector with an exposed area of 2 m2 as the heat source. It is shown that, an optimized adsorption system could achieve a coefficient of performance (COP) of about 0.56 and produce around 6 kg of ice a day. Copyright © 2003 John Wiley & Sons, Ltd.
15 citations
TL;DR: In this paper, the performance parameters such as COP and specific cooling power (SCP) of the rotary system are analyzed based on heat recovery temperature difference and counter-flow heat exchanger, and meaningful parameters related to the heat transfer fluid (HTF) and the system design are identified.
9 citations
TL;DR: In this paper, the performance of a lithium bromide absorption chiller in a solar powered air conditioning system, when being operated conventionally, was reported and discussed, and it was shown that, by partitioning the storage tank, the chiller performance is not significantly affected, and the solar powered cooling effect can be realized much earlier, achieving a higher total solar cooling COP system, compared to the conventional system designs.
Abstract: This paper reports the performance of a lithium bromide absorption chiller in a solar powered air conditioning system, when being operated conventionally. The chiller performance based on a modified solar powered absorption air conditioning system which is integrated with a partitioned storage tank has been presented and discussed. It is shown that, by partitioning the storage tank, the chiller performance is not significantly affected, and the solar powered cooling effect can be realized much earlier, achieving a higher total solar cooling COP system , compared to the conventional system designs.
1 citations
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9,432 citations
TL;DR: Approaches to Modifying the Electronic Band Structure for Visible-Light Harvesting and its Applications d0 Metal Oxide Photocatalysts 6518 4.4.1.
Abstract: 2.3. Evaluation of Photocatalytic Water Splitting 6507 2.3.1. Photocatalytic Activity 6507 2.3.2. Photocatalytic Stability 6507 3. UV-Active Photocatalysts for Water Splitting 6507 3.1. d0 Metal Oxide Photocatalyts 6507 3.1.1. Ti-, Zr-Based Oxides 6507 3.1.2. Nb-, Ta-Based Oxides 6514 3.1.3. W-, Mo-Based Oxides 6517 3.1.4. Other d0 Metal Oxides 6518 3.2. d10 Metal Oxide Photocatalyts 6518 3.3. f0 Metal Oxide Photocatalysts 6518 3.4. Nonoxide Photocatalysts 6518 4. Approaches to Modifying the Electronic Band Structure for Visible-Light Harvesting 6519
6,332 citations
TL;DR: For the first time, a multi-variables optimization approach is described to determine the optimum operation parameters so as to enhance process performance and photooxidation efficiency in the photocatalytic water treatment process.
4,293 citations
TL;DR: A comprehensive analysis of the reported effects of dopants on the anatase to rutile phase transformation and the mechanisms by which these effects are brought about is presented in this article, yielding a plot of the cationic radius versus the valence characterised by a distinct boundary between inhibitors and promoters.
Abstract: Titanium dioxide, TiO2, is an important photocatalytic material that exists as two main polymorphs, anatase and rutile. The presence of either or both of these phases impacts on the photocatalytic performance of the material. The present work reviews the anatase to rutile phase transformation. The synthesis and properties of anatase and rutile are examined, followed by a discussion of the thermodynamics of the phase transformation and the factors affecting its observation. A comprehensive analysis of the reported effects of dopants on the anatase to rutile phase transformation and the mechanisms by which these effects are brought about is presented in this review, yielding a plot of the cationic radius versus the valence characterised by a distinct boundary between inhibitors and promoters of the phase transformation. Further, the likely effects of dopant elements, including those for which experimental data are unavailable, on the phase transformation are deduced and presented on the basis of this analysis.
2,570 citations
University of Cambridge1, Istituto Italiano di Tecnologia2, Lancaster University3, University of Manchester4, Catalan Institution for Research and Advanced Studies5, Technical University of Denmark6, Nokia7, University of Trento8, Queen Mary University of London9, fondazione bruno kessler10, Technische Universität München11, Polytechnic University of Milan12, Centre national de la recherche scientifique13, University of Trieste14, University of Ioannina15, University of Geneva16, Trinity College, Dublin17, Texas Instruments18, University of Paris19, Spanish National Research Council20, Leiden University21, Delft University of Technology22, University of Patras23, École Normale Supérieure24, Radboud University Nijmegen25, Nest Labs26, Airbus UK27, Seoul National University28, Yonsei University29, University of Oxford30, Chalmers University of Technology31, University of Groningen32, STMicroelectronics33, Chemnitz University of Technology34, Max Planck Society35, Aalto University36
TL;DR: An overview of the key aspects of graphene and related materials, ranging from fundamental research challenges to a variety of applications in a large number of sectors, highlighting the steps necessary to take GRMs from a state of raw potential to a point where they might revolutionize multiple industries are provided.
Abstract: We present the science and technology roadmap for graphene, related two-dimensional crystals, and hybrid systems, targeting an evolution in technology, that might lead to impacts and benefits reaching into most areas of society. This roadmap was developed within the framework of the European Graphene Flagship and outlines the main targets and research areas as best understood at the start of this ambitious project. We provide an overview of the key aspects of graphene and related materials (GRMs), ranging from fundamental research challenges to a variety of applications in a large number of sectors, highlighting the steps necessary to take GRMs from a state of raw potential to a point where they might revolutionize multiple industries. We also define an extensive list of acronyms in an effort to standardize the nomenclature in this emerging field.
2,560 citations