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Sökning: db:Swepub > Övrigt vetenskapligt/konstnärligt > Kungliga Tekniska Högskolan

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18591.
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18592.
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18593.
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18594.
  • Nutakki, Tirumala Uday Kumar (författare)
  • Integration of Membrane Distillation and Solar Thermal Systems for Coproduction of Purified Water and Heat
  • 2017
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • In the Middle East and North Africa region fresh water resources are very scarce and theexisting sources are depleting rapidly. Desalination is the method to fulfill increasing waterdemand, and people depend mostly upon bottled water for drinking purposes. Bottledwater is resource and energy demanding, hence there is a need for supplying drinkablewater in a sustainable way. The main objective of this research is to develop solutions forproviding potable water to urban communities through integrating membrane distillationwater purification units with solar driven hot water installations. A single-cassette Air GapMembrane Distillation (AGMD) unit was tested on laboratory scale to investigate theinfluence of various operating parameters on the distillate production. Particular attentionwas given for identifying process conditions relevant to the design of solar energyintegrated systems. In parallel, a simplified empirical model using response surfacemethods was developed and validated against bench scale experimental results. Thedeveloped model for performance indicators was later employed in dynamic simulations ofa solar thermal integrated membrane distillation system. A pilot plant was designed andinstalled at RAK Research and Innovation Center in UAE. Experimental investigations wereconducted on this integrated system for co-production of pure water (around 15-25 l/day)along with hot water production equivalent to the needs of a family of five. A dynamicsimulation model was developed in TRNSYS to analyze optimum operating conditions ofthe system. Economic analysis showed an impressive payback period and savings for theintegrated system as compared with standalone counterparts. A second pilot facility using alarger multi-cassette AGMD module and absorption cooler was designed and installed.Performance of this solar co-production system for heat, cooling, and pure water is analyzedfor various integration modes.
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18595.
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18596.
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18597.
  • Nuur, Cali (författare)
  • Att forska om periferin i periferin- en personlig odyssey
  • 2007
  • Ingår i: Samtal och samhandling- erfarenheter från FOU-Centrum i Söderhamn interaktiv forskning i praktiken. - Söderhamn : Söderhams förlag. - 9789185085033
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)
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18598.
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18599.
  • Nuur, Cali, 1964- (författare)
  • Cluster Dynamics and Industrial Policy in Peripheral Regions : a study of cluster formation as a local development process
  • 2005
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The rapid growth of the global economy in the last two decades has created a new economic reality in many municipalities in peripheral regions of Sweden. Having earlier relied on traditional industry as the source of employment, today municipalities in peripheral regions are struggling to survive in a completely changed economic landscape, with new conditions for development. The dismantling of trade barriers, accessibility of new markets for production, and faster and cheaper modes of communication and transportation have combined in changing the conditions for development. While historically peripheral regions have depended on manufacturing firms as a source of employment, indications today show that local and regional development is enhanced through the development of locally acquired relationships that promote knowledge creation and transmission. In the past, the Swedish government had put in place measures to promote a degree of regional parities. These included enticement schemes to industry and the relocation of public bodies. Faced with the global winds of change that have arisen in the last few decades, this approach is becoming unsustainable.The overall aim of this dissertation is to contribute to the research aimed at enhancing regional economic development and to increase the understanding of as well as give insights into local economic development processes aimed at meeting global challenges in a peripheral region. In it I explore the two interrelated questions of 1) what are the mechanisms influencing location of economic activities and industrial policy in peripheral regions? 2) How do these mechanisms manifest themselves in a peripheral region?In this study, three case studies of local development processes in the two municipalities of Ljusdal and Söderhamn, in the geographical region of Hälsingland are presented. The case studies are named the business case, the policy case and the hybrid case to reflect the mechanisms that induced them.
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18600.
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