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Sökning: hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Naturresursteknik) > Konstnärligt arbete

  • Resultat 1-8 av 8
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1.
  • Acuña, José, 1982- (författare)
  • Distributed thermal response tests : New insights on U-pipe and Coaxial heat exchangers in groundwater-filled boreholes
  • 2013
  • Konstnärligt arbete (övrigt vetenskapligt/konstnärligt)abstract
    • U-pipe Borehole Heat Exchangers (BHE) are widely used today in ground source heating and cooling systems in spite of their less than optimal performance. This thesis provides a better understanding on the function of U-pipe BHEs and Investigates alternative methods to reduce the temperature difference between the circulating fluid and the borehole wall, including one thermosyphon and three different types of coaxial BHEs.Field tests are performed using distributed temperature measurements along U-pipe and coaxial heat exchangers installed in groundwater filled boreholes. The measurements are carried out during heat injection thermal response tests and during short heat extraction periods using heat pumps. Temperatures are measured inside the secondary fluid path, in the groundwater, and at the borehole wall. These type of temperature measurements were until now missing.A new method for testing borehole heat exchangers, Distributed Thermal Response Test (DTRT), has been proposed and demonstrated in U-pipe, pipe-in-pipe, and multi-pipe BHE designs. The method allows the quantification of the BHE performance at a local level.The operation of a U-pipe thermosyphon BHE consisting of an insulated down-comer and a larger riser pipe using CO2 as a secondary fluid has been demonstrated in a groundwater filled borehole, 70 m deep. It was found that the CO2 may be sub-cooled at the bottom and that it flows upwards through the riser in liquid state until about 30 m depth, where it starts to evaporate.Various power levels and different volumetric flow rates have been imposed to the tested BHEs and used to calculate local ground thermal conductivities and thermal resistances. The local ground thermal conductivities, preferably evaluated at thermal recovery conditions during DTRTs, were found to vary with depth. Local and effective borehole thermal resistances in most heat exchangers have been calculated, and their differences have been discussed in an effort to suggest better methods for interpretation of data from field tests.Large thermal shunt flow between down- and up-going flow channels was identified in all heat exchanger types, particularly at low volumetric flow rates, except in a multi-pipe BHE having an insulated central pipe where the thermal contact between down- and up-coming fluid was almost eliminated.At relatively high volumetric flow rates, U-pipe BHEs show a nearly even distribution of the heat transfer between the ground and the secondary fluid along the depth. The same applies to all coaxial BHEs as long as the flow travels downwards through the central pipe. In the opposite flow direction, an uneven power distribution was measured in multi-chamber and multi-pipe BHEs.Pipe-in-pipe and multi-pipe coaxial heat exchangers show significantly lower local borehole resistances than U-pipes, ranging in average between 0.015 and 0.040 Km/W. These heat exchangers can significantly decrease the temperature difference between the secondary fluid and the ground and may allow the use of plain water as secondary fluid, an alternative to typical antifreeze aqueous solutions. The latter was demonstrated in a pipe-in-pipe BHE having an effective resistance of about 0.030 Km/W.Forced convection in the groundwater achieved by injecting nitrogen bubbles was found to reduce the local thermal resistance in U-pipe BHEs by about 30% during heat injection conditions. The temperatures inside the groundwater are homogenized while injecting the N2, and no radial temperature gradients are then identified. The fluid to groundwater thermal resistance during forced convection was measured to be 0.036 Km/W. This resistance varied between this value and 0.072 Km/W during natural convection conditions in the groundwater, being highest during heat pump operation at temperatures close to the water density maximum.
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2.
  • Duwig, Christophe (creator_code:cre_t)
  • Exhibition : Towards the energy of the future – the invisible revolution behind the electrical socket
  • 2023
  • Konstnärligt arbeteabstract
    • Energy Crisis! Electricity Price drama! The threat of global energy poverty! Media are generous with spectacular titles. Yes, energy is important, and yes, nearly all societal challenges are connected to how we convert, distribute and use energy. Therefore, the KTH Energy Platform and KTH Library presented an exhibition with the theme Towards the energy of the future – the invisible revolution behind the electrical socket.The exhibition displayed showcase illustrations from the book made by Lotta Waesterberg Tomasson, as well as books related to energy and electricity from the KTH Library's collections. In parallell with the exhibition, a series of live popular science lunch seminars with presentations of selected chapters of the book took place. As part of the exhibition, students from KTH's Electrical Engineering program also showcased exciting projects that connect to the anthology’s contents, made with materials and equipment from the student-driven ELAB and “Studentverkstan”. Visitors were also invited to share their reflections and ideas on energy. 
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3.
  • Paul, Seema, et al. (författare)
  • Hydro-meteorological processes driving solute transport in Lake Victoria
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • This study explores by a vertically integrated tracer transport model, hydro-meteorological event characteristics and their influence on solute transport. Changes in Hydro-meteorological processes and increasing frequency of extreme weather events are responsible for changing the lake water balance, influencing streamflow variations, and lake tracer transport. We compare historical data over a long time with model data from a vertically integrated model in Comsol Multiphysics. We consider water balance, sources of data uncertainty, correlations, extreme rain and inflow years, and seasonal variations. The lake transport model has estimated soluble loading and transportation. The results showed that the lake rainfall is seasonal; there are strong correlations between tributary inflows and precipitation, and between lake outflow and water level. It was found that “events” influence lake level fluctuations. The solute transport was shown to vary more in wet periods. Modeled transportations were higher in Kenya and Uganda lake zones than in Tanzanian zones. The major inflow, from the Kagera river, appears to strongly influence lake solute transportation, so the composition of this river must be considered.
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4.
  • Persson, Lina, 1978-, et al. (författare)
  • Klimatavtrycket för projektet Klimaträttvist Världande : Rapport av livscykelanalysen av forskningsprojektet Klimaträttvist Världande
  • 2021
  • Rapport (refereegranskat)abstract
    • Rapport för livscykelanalys (LCA) av Lina Perssons konstnärliga praktik utförd av Karin Lagercrantz. I denna LCA har sex projekt som Persson skapat inom ramen för Climate-Just Worldings (C-J W) mellan 2019-2020 utvärderats. Syftet med denna LCA är att mäta och beräkna vilket klimatavtryck Perssons forskningsprojekt C-J W har.  Valet av denna kvantitativa metod kommer av den fiktiva berättelsevärlden som driver C-J W-projektet. LCA:s funktion korrelerar med de grundläggande mekanismerna för berättelsevärldens tidsmaskin och cyborg-Gaia-karaktär. Resultaten från LCA kommer att återföras till berättelsevärlden som en del av den kontinuerliga samspelet mellan fiktionsutveckling och interventioner i vardagen. De kvantitativa metoderna i Perssons konstnärliga praktik syftar till att bryta med internaliserade och normaliserade föråldrade strukturer och orättvisa privilegier. När man är van vid privilegier känns jämlikhet som förtryck. Därför kan det vara nödvändigt att mäta vårt beteende för att synliggöra våra privilegier. Med denna kvantitativa analys vill vi föra fram en diskussion om klimaträttvisa i relation till konstnärliga praktiker och produktioner. Ett konkret syfte med denna LCA är att vägleda Persson i vad hon kan göra för att minska sina utsläpp i framtida projekt. Det kommer att stödja henne i att skapa klimatbudget och ligga till grund för en mall för beräkning av utsläpp i hennes framtida praktiker.
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5.
  • Persson, Lina, 1978- (creator_code:cre_t)
  • Klimatkalkylatorn Elsa : verktyg för beräkning av klimatavtryck vid filmproduktion
  • 2021
  • Konstnärligt arbete (mjukvara/multimedium) (refereegranskat)abstract
    • Kalkylator för beräkning av koldioxidavtryck av filmproduktion, av Karin Lagercrantz, under överseende av Anna Björklund, som del av Lina Perssons konstnärliga forskningsprojekt KLIMATRÄTTVIST VÄRLDANDE vid Stockholms konstnärliga högskola. Finansierat av Vetenskapsrådet och NAVET.Kalkylatorn programmerades efter noggrann livscykelanalys (LCA) av Lina Perssons forskningsaktiviteter samt studenters examensfilmer vid film och mediainstitutionen. Metodrapporten finns på dokumentets sista sida.Syftet var att öka förståelsen för klimatavtrycket av filmproduktionens olika delar och ge konkreta verktyg för att transformera filmproduktioner och dess konstnärliga processer till mer hållbara. Målet är att verktygen skall användas i SKH’s undervisning och av aktörer i filmbranschen och det konstnärliga fältet.
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7.
  • Acuña, José, 1982-, et al. (författare)
  • Distributed thermal response tests on pipe-in-pipe borehole heat exchangers
  • 2013
  • Ingår i: Applied Energy. - : Elsevier BV. - 0306-2619 .- 1872-9118. ; 109:SI, s. 312-320
  • Tidskriftsartikel (refereegranskat)abstract
    • Borehole Thermal Energy Storage systems typically use U-pipe Borehole Heat Exchangers (BHE) having borehole thermal resistances of at least 0.06 K m/W. Obviously, there is room for improvement in the U-pipe design to decrease these values. Additionally, there is a need for methods of getting more detailed knowledge about the performance of BHEs. Performing Distributed Thermal Response Tests (DTRT) on new proposed designs helps to fill this gap, as the ground thermal conductivity and thermal resistances in a BHE can be determined at many instances in the borehole thanks to distributed temperature measurements along the depth. In this paper, results from three heat injection DTRTs carried out on two coaxial pipe-in-pipe BHEs at different flow rates are presented for the first time. The tested pipe-in-pipe geometry consists of a central tube inserted into a larger external flexible pipe, forming an annular space between them. The external pipe is pressed to the borehole wall by applying a slight overpressure at the inside, resulting in good thermal contact and at the same time opening up for a novel method for measuring the borehole wall temperature in situ, by squeezing a fiber optic cable between the external pipe and the borehole wall. A reflection about how to calculate borehole thermal resistance in pipe-in-pipe BHEs is presented. Detailed fluid and borehole wall temperatures along the depth during the whole duration of the DTRTs allowed to calculate local and effective borehole thermal resistances and ground thermal conductivities. Local thermal resistances were found to be almost negligible as compared to U-pipe BHEs, and the effective borehole resistance equal to about 0.03 K m/W. The injected power was found to be almost evenly distributed along the depth.
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8.
  • Posch, Josefina (författare)
  • EP9 Starlight Reserves
  • 2023
  • Ingår i: Göteborgs Botaniska Trädgård, GIBCA Extended, 2023-08-19.
  • Konstnärligt arbete (övrigt vetenskapligt/konstnärligt)abstract
    • The sculpture EP9 Starlight Reserves was installed in Amerikadammen in Göteborgs Botaniska Trädgård and part of GIBCA Extended 2023. This work is situated in the expanded field of sculpture, where the negotiation with a specific situation plays a central role in material investigations of environmental and sustainability concerns. The shape and title of the sculpture derive from the container of old batteries, "Exposed Pallet 9," which the International Space Station launched into space in 2021 to circulate around the Earth for 2-4 years before entering the Earth's atmosphere and hopefully burn up. [1] Commercial interests, colonization, and tourism led by rich nations and private companies contribute to the increase of space debris. The main inquiry of this research project is how artistic work, through visualization in sculptural form, can draw attention to scientific observations and advocacy in establishing international environmental space law concerning space debris. By using recycled plastic from electronic scrap for the large-scale IRBAM printing of the sculpture, the work highlights the potential for sustainable and ephemeral materials in sculptural production to promote environmental awareness and question the validity of the standard requirement for "permanence" in public sculpture. 3D printing in collaboration with Samuel Johansson and Woodrow Wiest RISE – AM center in Mölndal, Sweden with in-kind funding. Supported by Göteborgs Stad Kultur och Göteborgs Botaniska Trädgård. [1] Mike Wall, “Space station tosses 2.9-ton hunk of space junk overboard. It will stay in orbit for years.”, space.com, accessed January 3, 2024, https://www.space.com/space-station-jettisons-huge-space-junk-pallet
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  • Resultat 1-8 av 8

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