• Energy Research

The construction concept will allow gaining the maximum value of aerodynamic effectiveness in a wide range of service conditions. In this way conceived wind aggregate will enable capturing the low-potential wind energy and its transformation and accumulation into electric energy usable as peak energy by the means of energetic converters with capacitance accumulation. Part of the solution is also a configuration concept of objective wind energetic unit with non-electric accumulation with trend to the possibility of a wide usage in the energetic network structures.

In dit afstudeerwerk is een globaal ontwerp opgesteld voor een PAC met laag reservoirpeil (zie de bijlagen 2, 11 en 12, uitvoering in bijlagen 20 en 22), Deze variant van pompaccumulatie biedt een oplossing voor twee belangrijke problemen van 'normale' PAC's: bij bezwijken van de dijk is er geen direct gevaar voor de omgeving en problemen met horizonvervuiling treden ook niet meer op. Een PAC met laag reservoirpeil brengt echter wel enige specifieke problemen met zich mee: er treden grotere kweldebieten op dan bij 'normale' PAC's en de bouw is gecompliceerder. Allereerst is globaal vastgesteld hoe groot de PAC met laag reservoirpeil moet worden. Uitgaande van het onderzoek dat in de eerste helft van de jaren tachtig is uitgevoerd, onder andere naar aanleiding van het Plan Lievense, is vastgesteld dat het ontwerp een garantievermogen van 1500 MW en een energie-inhoud van 30 GWh moet krijgen. Met behulp van verschillende vuistregels Is een globale dijkdoorsnede vastgesteld. Met de zo verkregen parameters is een grondbalans opgezet, waarmee bij een gekozen valhoogte en een gekozen waterdiepte een kruinbreedte werd gevonden. De evenwichtseis in de grondbalans was dat er geen aan- of afvoer van zand nodig mocht zijn. De in te voeren waterdiepte volgde uit een onderzoek naar mogelijke projectlocaties. Gekozen is voor een locatie op de coördinaten 52°30'NB, 4°1TOL (circa 16 km ten westen van IJmuiden), Op deze locatie bleek een PAC goed in te passen, mits de totale doorsnede niet groter zou zijn dan circa 8 km. De waterdiepte op de projectlocatie is iets minder dan 18 m (er is gerekend met een diepte bij LLW van 17,75 m). De grondbalans liet zien dat de kruin 720 m breed moet worden. Het grootste deel van de kruin ligt op LLW+7 m, langs de buitenrand is een zeewering geprojecteerd met een kruin op LLW+10 m. De totale diameter komt uit op 7520 m. Uit diverse bronnen werd vernomen dat met name de kwel een belangrijk probleem zou zijn, vandaar dat eerst dit probleem in kaart is gebracht, alvorens het ontwerp uit te ...

Předkládaná diplomová práce se zaměřuje na prozkoumání alternativních způsobů akumulace elektrické energie pro nízkoenergetické rodinné domy. Poskytuje přehled informací o nízkoenergetických domech a jejich přednostech, zároveň se zaměřuje na poskytnutí informací o různých možnostech akumulace energie, elektrické i tepelné. V neposlední řadě je zde popsáno několik možných druhů akumulace elektrické energie a jejich ekonomické zhodnocení. ; Katedra elektroenergetiky a ekologie ; Obhájeno ; This submited thesis aims to explore some alternative ways of electrical energy accumulation for low energy houses. It provides an overview about low energy houses and their qualities and also points out information about different ways of energy accumulation either electrical or thermal. Last but not least this thesis describes some possible ways of electrical energy accumulation and their economical classification.

This thesis provides an overview of the design and modeling of a hydraulic strain energy accumulator made out of an elastomeric material. The document first presents the theory and reasoning behind the design and fabrication of such a device. Next in the manuscript is a description of low-pressure prototype testing and discussion of the associated relevant findings. Then, the document expounds on the difficulties of modeling the behavior of a full-scale prototype of said device; a solution is subsequently offered by presenting full-scale behavior simulation results obtained with the use of the ABAQUS finite element analysis software package. The thesis is concluded with a description of future work aimed at increasing model fidelity and creating an experimental setup suitable for testing the performance of the first full-scale strain energy accumulators.

Investigation of SHEP systems developed by Advanced Energy Systems, Energy Research and Generation, Inc., M.A.N. and Technical University of Denmark. ; "September 1983." ; "UMTA Technical Assistance Program." ; Performing organization: Booz-Allen & Hamilton, Inc. ; Cover title. ; Bibliography: p. B1-B20. ; Investigation of SHEP systems developed by Advanced Energy Systems, Energy Research and Generation, Inc., M.A.N. and Technical University of Denmark. ; Mode of access: Internet.

Read before the Society in Belfast on 15th May 1953 In case this rather ambitious title should raise any false hopes, I must explain at once that I am not an economist or in any way qualified to deal with the subject in a professional manner. It is true that I took a Degree in Economics 46 years ago, but since then I have been far too busy to follow more than very superficially the immense developments which have taken place in economic thought. I have, however, been in fairly close contact with the practical consequences of economic events. I was for 16 years director of the Federation of British Industries, for over 12 years a member of the Council of the International Chamber of Commerce, and more recently Minister of Commerce in this country. Such ideas as there may be in this paper are, therefore, those of a complete amateur, but of one who has seen a good deal of economic history being made during the past 40 years.

In this thesis, I focus on the system design and performance analysis of wireless communication networks with radio frequency (RF) energy harvesting. Battery re-placement/recharging has always been a challenging issue in wireless communication networks, especially in large-scale networks like wireless sensor networks (WSNs). Recently, RF energy harvesting (EH) technology has been developed as a new viable solution to extend the lifetime of wireless networks via enabling wireless devices to harvest energy from RF signals. Inspired by this technique, wireless-powered communication networks (WPCNs) have attracted an upsurge of research interest. According to the protocols proposed in current literature, an EH user will exhaust all the energy it harvests straightway during this transmission block. This may be a sub-optimal solution, since this little amount of energy may not be able to contribute to an effective transmission. Therefore, in this thesis, I consider energy accumulation at each EH node by providing an energy storage (e.g. a rechargeable battery), so that it can an accumulate sufficient amount of harvested energy before transmission and wait to transmit in an appropriate time slot. To begin with, I first investigate wireless energy harvesting (WEH) technique in cooperative communication networks where the source and relay can both communicate with the destination. I refer to this kind of network as wireless-powered cooperative communication networks (WPCCNs). This WEH technique offers a new cooperation manner for wireless devices since the relay node is now able to harvest energy from the source’s information. In this thesis, I consider the relay as a wireless-powered node that has no external power supply; but it is equipped with an EH unit and a rechargeable battery so that it can harvest and accumulate energy from RF signals broadcast by the source. By fully incorporating the EH feature of the relay, an opportunistic relaying protocol was developed, termed accumulate-then-forward (ATF), for the ...