Dissertations / Theses on the topic 'Mud pumps'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 27 dissertations / theses for your research on the topic 'Mud pumps.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Mok, Soon H. "An investigation of energy-based planned maintenance of offshore drilling mud pumps." Thesis, Robert Gordon University, 1994. http://hdl.handle.net/10059/2136.
Full textVolec, Martin. "Malá vrtná souprava pro vrtání studní." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232188.
Full textHedlund, Sandra. "Utredning av värmepump med fjärrvärmespets." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-13304.
Full textThis is an essay about a property at Norra Kungsgatan 37-43 who is heated with both a heat pump and district heating. The heat pump is used primarily and district heating is used as a tip when the heat from the heat pump is not enough. This is a pretty rare combination. The purpose of this essay is to find out if this is a good solution and if the solution is economically viable. To determine the heat demand of the property, calculations based on district heating data and heat pump data from previously years has been used. The heat demand of the building is estimated to be approximately 895 MWh/year and the heat pump is estimated to cover 54% of the heat demand. Based on this, the cost for heating the building with district heating is compared with the cost of heating the building with the heat pump and district heating. By using the heat pump, more than 140 000 kronor per year can be saved. This means that the heat pump is economically viable. However, the use of high-quality energy for heating is discussed. Heat is energy with lower quality and should be used primarily for heating. We can not waste our precious energy resources if we want to achieve sustainable development.
Edström, Johan, and Samuel Hammar. "Framtagning av beräkningsmodell för uppvärmningssystem : med fokus på kombinationen fjärrvärme och frånluftsvärmepumpar." Thesis, Högskolan Väst, Avdelningen för maskinteknik och naturvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-9834.
Full textAs a result of the EU's environmental 2020 goal, the Swedish government and municipal boards has put up internal goals to reduce energy consumption. EU 2020 goal aims to reduce energy consumption in Europe by 20 percent by the year 2020 from that the target was set in 2010. At the municipal level, this has meant that private but mainly public housing properties have been required to review their energy use. The work in this report is based on one of the savings measures that have been taken, which is to supplement existing district heating systems with exhaust air heat pumps. The project aims to develop a calculation model for evaluation and computation for this type of system. To create a reliable basis for decisions, efforts were made to produce just calculations. Existing computational models are focused on economic factors and thus takes little consideration of technological aspects and environmental factors. The aim of the work has been to create a computational model which more closely reflects the real situation and demonstrates a more informative decision basis. The work began with a literature review which included relevant research and basic facts about exhaust air heat pumps and district heating systems. The calculation model has been developed continuously during the project in which new functions and new information constantly has been added. The project has resulted in a working computational model which includes many more parameters than previous reviewed models. Together with the client three sub goals were set up for the model, these were: To intuitively present information and data. To create a transparent structure which is simple to follow. To create a flow through the model, which follows a desired work process. These goals are considered to have been fulfilled in the developed calculation model, however, it's possible to further develop this model. The model could, for example, be supplemented with more automated optimization calculations and be adjusted to handle other kinds of heating systems.
Goldsteins, Linards. "Analyse expérimentale et numérique du comportement électromagnétique de pompe à induction linéaire annulaire." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI047/document.
Full textThe research explores the issue of magnetohydrodynamic (MHD) instability in electromagnetic induction pumps with focus on the regimes of high slip Reynolds magnetic number ( ) in Annular Linear Induction Pumps (ALIP) operating with liquid sodium. The context of the thesis is French GEN IV Sodium Fast Reactor research and development program for ASTRID in a framework of which the use of high discharge ALIP in the secondary cooling loops is being studied. CEA has designed, realized and will exploit PEMDYN facility, able to represent MHD instability in high discharge ALIP.In the thesis stability of an ideal ALIP is elaborated theoretically using linear stability analysis. Analysis revealed that strong amplification of perturbation is expected after convective stability threshold is reached. Theory is supported with numerical results and experiments reported in literature. Stable operation and stabilization technique operating with two frequencies in case of an ideal ALIP is discussed and necessary conditions derived.Detailed numerical models of flat linear induction pump (FLIP) taking into account effects of a real pump are developed. New technique of magnetic field measurements has been introduced and experimental results demonstrate a qualitative agreement with numerical models capturing all principal phenomena such as oscillation of magnetic field and perturbed velocity profiles. These results give significantly more profound insight in the phenomenon of MHD instability and can be used as a reference in further studies
Gustafsson, Olle, and Johan Karlsson. "Resurseffektiv energieffektivisering av flerbostadshus : Frånluftsvärmepumpar i kombination med fjärrvärme." Thesis, Linköpings universitet, Energisystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119214.
Full textForsman, Gustav. "Säkra lyft för vertikala gruvpumpar : Med förbättringsförslag." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-43994.
Full textABSTRACT Purpose: The purpose of this thesis was to find out risks with the lift for the vertical mining pumps and use that information to make a better lift where it should include features that solve the problem regarding safe, ergonomic and user-friendly for users on Metso Sweden AB. To solve these problems, these issues were raised to achieve improvement opportunities: 1. How can you make a safe lift to those vertical mining pumps? 2. How do you get this lift to be ergonomic for the user? 3. How do I achieve user-friendliness? Method: Methods have been used and applied from the generic product development process to be problem-free. To obtain primary data, observations, interviews, workshops were done, but also secondary data in the form of a literature study. Result: The study resulted in a common solution being found within the boundaries. Developments have made from the concept phase to the final product to achieve success. Calculations have been made to show the product's strength class to see if it can withstand the pressure and the potential displacement that can occur at different loads. The product is given as a proposal and recommendation for improvements. Conclusion: Suggestions have been made for how the problem presented can be solved with the help of a new fact-based product that is not required to risk the health of the personnel and the environment. Recommendations: Metso Sweden AB is recommended to take actions to eliminate the risks associated with their lifting that takes place within the boundary. Here, the new solution should be based on safety, ergonomics and user-friendliness to achieve success and that further development will occur for the proposed solution. Keywords: Ergonomics, Lift, Lifting Tool, Mining pumps, Product development, Safety, User-friendliness
Fredlund, Markus, and Markus Olsson. "Jämförande undersökning av värmeåtervinning ur frånluft i två flerbostadshus med frånluftvärmepumpar." Thesis, KTH, Byggteknik och design, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-101670.
Full textTwo different heating systems in two apartment buildings have been analyzed. The goal of this analysis is to get an idea of which heating system is most beneficial in apartment buildings. The analysis compares two different heating systems. Two different kinds of exhaust air heat pumps are used to recover heat from exhaust air. When heat pumps are unable to produce enough heat to cover the heating demand of the buildings, district heating is used. The heat pumps are the property's main source of heat. In one property, Gäddan 1, an air-water heat pump is used. The cooling coil located in the exhaust air heat pump is placed in the exhaust chamber. The other property, Gäddan 2, features two outdoor heat pumps. These two pumps are disposed in an exhaust chamber in order to recover the hot air. During analysis, a compilation of measurements and predictions from a measurement period of three weeks has been analyzed in order to calculate the various parameters. The analysis compares the different heating systems based on three different factors including energy, environment and economy. The parameters that are calculated are the coefficient of performance (COP), energy consumption (kWh), life cycle cost (LCC), payback period (years) and cost of the produced thermal energy (SEK / kWh). The results are based on statistics and compared between each other. The result of the analysis shows that the heating system in the property Gäddan 1 is the most beneficial, according to the methods used concerning both energy and economy. The result shows that Gäddan 1 has a 20 % higher coefficient of performance, 12 % lower operating cost and 50 % faster payback time for the heating system. However, this heating system has 36 % higher carbon dioxide emissions during its life span, which is based on 20 years. In conclusion the properties size may also affect the results. Gäddan 1 is a larger building and has more flats than Gäddan 2. This affects the consumption of district heating in the heating systems with increase carbon emissions. This may be a contributing factor to a higher carbon dioxide emission in Gäddan 1 (36 %) compare to Gäddan 2.
Nordenström, Erik. "Värmesystem i flerbostadshus: Kombinera fjärrvärme med frånluftsvärmepump : För ekonomisk och hållbar utveckling." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-48228.
Full textThe overall aim of the current EU strategy Sustainable Development is to identify and develop measures to ensure that quality of life can be constantly improved, both for present and future generations. A part of the strategy is the climate targets which in the first phase extend to 2020. Its Member States shall then have reduced both their energy use and greenhouse gas emissions by 20 %. In Sweden the residential and service sector stands for 40 % of the country's energy use, they have themselves set the target to 25 % savings. New policies and improved energy efficiency will lead to completion. An important area of development is the heating of buildings, which accounts for 60 % of the sector's energy use. A large part of the housing stock is considered to have an energy savings potential of 20-50 %. Next to the improvement of the building envelope, the selection of heating system is of great importance. More than 90 % of delivered heat energy to the apartment blocks in Sweden comes from district heating. By supplementing district heating with exhaust air heat pumps, the building's energy efficiency can be increased and building owners can make a financial gain in the reduced amount of purchased energy. District heating distributers have responded to this development by changing their subscriptions, making the heating system oversized much of the year, thereby the heat pump becomes more or less redundant. In this case study, the heating system of an apartment building in the town of Grums (Sweden) is of interest. The exhaust air heat pump was already installed before the district heating subscription was changed. The new district heating subscription implicates that property owners have to choose which maximum base effect they can get delivered all year round. An investigation is necessary to ensure that the selected option provides a stable and low cost at different temperature. From the property owner's perspective, the problem is of economic nature. This study however, concentrates on the combination of district heating with heat pumps seen from the energy use and sustainability aspect. Is the heating system working in the best way today, or it is possible to find alternative modes that work better? The target with this study is to find an operational mode that primarily will reduce fuel use by 25%, secondary will lower carbon dioxide generation and cut life-cycle cost of the heat pump and thirdly will reduce the amount of purchased energy. These targets must be achieved within the annual outside temperature of 5-7 ºC. Currently the exhaust air heat pump is used as basic heat, warming up radiators and domestic hot water while district heating covers the deficit of the house's heating demand. Current operating mode is compared with two alternatives. Option 1 involves a change of the heat pump, to one with more power, district heating will heat the domestic hot water and will continuously work as a backup for the heat pump. In Option 2, the operation mode is altered to optimize use of the district heating base effect, the heat pump runs only when the selected base effect does not cover the heating demand. Apart from that the heat pump is replaced in the first case, no reinstallation is required for these options. Study calculations are made by using Microsoft Excel and duration diagrams. The results shows that none of the options reach the targets completely, however, Option 1 is closer considering that the primary goal (saving resources) is reached in part. The study shows that heating systems in apartment buildings, similar to the reference object, can be adjusted as well as the choice of base effect (district heating) in order to successfully reduce environmental effects and/or achieve financial gain. Increased use of district heating indirectly reduces carbon dioxide generation but increases resource use. Replacement of exhaust air heat pump reduces purchased energy which leads to reduced use of resources and better economy, however, will increase electricity consumption, which gives a marginal addition contribution of carbon dioxide generation.
Andersson, Hilda, Sofia Appelgren, Anna Boström, Siri Norlander, Emma Stam, and Miranda Stiernborg. "Snabba mikrofluidiska test möjliggör specialanpassad sjukvård : Utveckling av två designförslag med fokus på material, struktur och pump." Thesis, Uppsala universitet, Institutionen för biologisk grundutbildning, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-295284.
Full textTwo designs were developed for a fast antibiotic susceptibility test (AST) based on a microfluidicsystem by Gradientech AB. Antibiotic resistance is a big and growing global problem. Fasterdiagnostic tests are needed to improve the diagnostics of bacterial infections and enablespecialized antibiotic therapy. Linear gradients of antibiotics in the microfluidic system in thisproject enables faster detection of antibiotic susceptibility compared to ASTs used today inhealth care. The aim of this project has been to adapt the test developed by Gradientech AB fora clinical market. The main focus has been on materials, pumping systems and structure of theAST. The two designs are based on requirements of a reliable and cheap test that is easy to useand minimizes the biohazard. The first design uses a chip-based peristaltic pump and the otherdesign is a three-layer structure with a diaphragm pump. The two designs consists of both arigid plastic material and an elastic material. When this test becomes available to the clinicalmarket it will improve the care of patients with bacterial blood infections and reduce healthcarecosts. It will also reduce the use of broad-spectrum treatment of antibiotics and help counteractincreased global antibiotic resistance.
Olofsson, Petter, and Jimmy Utterström. "Hydraulstyrning med konfiguration över Bluetooth." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-122408.
Full textThis report encompasses the development of a standalone drive card with an accompanying mobile application for control and configuration of a hydraulic system. The purpose of the project was to - according to an inquiry from the client Bosch Rexroth - investigate whether the pump control module (PCM) from the existing Spider 3 control system could be used as a standalone module. Hardware including a Bluetooth module was assembled and connected to the PCM to allow communication over Bluetooth Low Energy (BLE). A mobile application where developed in Android Studio to allow configuration from a mobile device. The software of the PCM were modified to communicate with the Bluetooth hardware over CAN and also for allowing analog control of the hydraulic pump through a current controlled input.The basic demands for the system were met and a working prototype could be demonstrated at the end of the project. The prototype did show large potential but was lacking some functionality which would be desirable for a commercial product.
Åsander, Henrik. "Tillvaratagande av värmeenergi ur gråvatten med värmepump i flerbostadshus." Thesis, Högskolan i Gävle, Energisystem, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-25099.
Full textLarge amounts of energy leave homes with wastewater without any effort to return the heated water's thermal energy back to the building. With increased thermal envelope improvements of a traditional nature to meet the nearly zero-energy requirements for residential buildings that will come into effect by the end of 2020, energy losses in buildings can increasingly be allocated to the wastewater leaving the building. The aim of this work is to investigate whether significant energy savings in the mentioned area can be obtained, as well as to assess the economic opportunities and prospects for utilizing heat energy from grey water from multi-residential buildings connected to district heating networks with the help of a heat pump. And by that show which factors are shown to influence the operational savings and how sensitive the results are in relation to a selection of these factors. The work consists of and has been carried out in two parts: a literature study and a calculation study. Household wastewater can be divided into grey and black water. Grey water is the water that comes from bath, dishes and laundry and black water is the water that is flushed out of the toilets. Separated flows reveal the possibility of utilizing thermal energy directly from grey water, which is also the warmer, volume largest and more manageable fraction, both from a water purification and heat recovery standpoint. Studies on source separated systems show a wide range of benefits, largely by keeping household wastewater separated, such as increased resource efficiency of nitrogen and phosphorus at the wastewater treatment plants. The contamination of heat exchanger surfaces, especially biofilm, poses a challenge when wastewater is used as a heat source and is something that has to be taken into account even when using grey water as a heat source. The result of the calculations of an individual case with preheating of domestic hot water, given a series of assumptions, resulted in operational cost savings of approximately SEK 31,000 per year and a present value of these annual savings over 20 years of approximately SEK 355,000. Energy savings amounted to approximately 63,000 kWh per year, which means a reduction of the total need for purchased energy for domestic hot water production by 67 % with an assumption of a final domestic hot water temperature of 55 °C. The sensitivity analysis shows that crucial parameters in the calculation study such as electrical and district heating price, heat pump life and discount rate entail relatively large changes in profit if allowed to vary. It is obvious that there are large amounts of energy to potentially recycle. It is also obvious that difficulties cause grey water as a source of heat not be treated easily because, among other things, the long-term development of household water use and high pollution rates are factors that must be considered in addition to the factors brought up in the sensitivity analysis. District heating and heat pump combined imply a higher investment than a single heating system, but at the same time is something that can be seen as a tool for utilizing the assumed increasing energy price variations that an increasing proportion of intermittent renewable power generation implies simply by varying heating configuration with changes in energy prices and finding the optimal share. For a property owner, it would at this point be favorable to be able to choose what the cheapest option is currently.
Agrell, Elias. "Analys av massapumps- och mixerarbete vid Metsä Board Sverige AB, Husums Fabriker : Energibesparingsåtgärder vid blekeri 4 & 5 med jämförelse mot ny utrustning." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-93626.
Full textMetsä Board Husum har idag ett flertal olika modeller av massapumpar vid blekeri 4 och 5. Dessa är av deplacerande typ (HC-pump, Sunds Defibrator PTD-60) samt centrifugalmodell (MC-pump, MCA 42-200, MCP 30/20), centrifugalmodellen regleras med strypventiler vilket innebär en extra förlust, speciellt märkbar är denna då produktionen tas ned. Vid blekeriet finns även kemikaliemixrar för att mixa in ClO2 innan pappersmassan pumpas till ett uppehållstorn där blekprocessen sker. Anläggningens nuläge genomgick en mindre kartläggning där specifikationer och mätdata samlades in för att ge en bakgrund till det energibehov som finns idag. Tillgänglighet för reservdelar har varit av intresse för de äldre HC-pumparna. Tillsammans med Sulzer har uppfordringshöjd beräknats för positioner utrustade med PTD -60 då uppgifter för denna saknades. Sulzer och Valmet har offererat ny utrustning för dessa positioner som jämförs mot uppmätta värden för att beräkna återbetalningstid. Inkomna offerter förutsätter frekvensomriktare och baseras på en önskad produktionsökning till 50 ADMt/h för blekeri 4 och 60 ADMt/h för blekeri 5. Detta är en ökning på 10 ADMt/h och blekeri. Erforderlig effekt för drifter i inkomna offerter och uppmätt effekt är ej angiven vid samma driftpunkt. De offererade pumparnas driftpunkt har därför räknats om för att motsvara driftpunkt vid tillfället för insamling av data. Detta för att enkelt kunna jämföra offerter mot nuläge. På blekeri 4 återfinns en MC-pump av modell MCA 42-200 med posnummer 441PU255. Vid denna position gjordes en djupare undersökning då nivåregleringen ej fungerar som tänkt. Nivåhållning sker via reglerventil och varvtalsreglering med frekvensomriktare. För att kunna köra driften har frekvensomriktaren manuellt ställts i ett fast varvtal och reglerventilen lagts i automatik. Ventilen styr därmed nivå i fallröret och har vid normal drift en öppningsgrad på 40-50 %. Vid genomgången upptäcktes att parametrar i styrsystem gällande de varvtal motorn skall arbeta vid inte korrigerats efter en ombyggnation. Detta har medfört att nivån inte gått att reglera i automatik utan att systemet börjat självsvänga. För att undersöka skillnad mellan varvtalsstyrning och strypreglering gjordes ett försök där varvtalet sänktes från 1520 rpm till 1100 rpm vilket resulterade i en effektminskning på 82 kW eller 342 081 kr per år jämfört med strypreglering; detta var vid en produktion av 36 ADMt/h. Försöket gjordes med något lägre produktion än önskvärt; på grund av detta kommer besparingen minska något vid högre produktion. Samtliga positioner uppvisar minskat energibehov med ny utrustning. Dock gör hög investeringskostnad och krav på kort återbetalningstid att endast några få positioner är lämpliga kandidater för ombyggnad i dagsläget. För MC-pumparna kan däremot majoriteten av besparingen uppnås genom att bygga om dagens strypreglering till varvtalsreglering. Detta sker till en betydligt lägre kostnad än vid uppgradering av pump. Arbetet visar att det finns stor potential att minska energikonsumtion vid blekning av pappersmassa, detta gäller speciellt för de befintliga MC-pumparna som är kraftigt överdimensionerade och regleras med strypventil. De gamla kemikaliemixrarna använder stora mängder energi för att mixa in ClO2, nya mixrar använder mindre än hälften av energin och ger överskådliga återbetalningstider.
Hinkelmann, Moritz [Verfasser]. "Compact and efficient sub-10 ps pump sources at 2 µm for the generation of coherent mid-infrared radiation / Moritz Hinkelmann." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2020. http://d-nb.info/1205878475/34.
Full textBengtsdottir, Fanney, and Norrman Christel Hagerup. "Att bygga energisnålt med olika ventilationssystem." Thesis, Linnéuniversitetet, Institutionen för byggteknik (BY), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-76634.
Full textA ventilation system in a building provides sufficient amount of fresh air and create a negative pressure to reduce moisture-related problems. Today several ventilation systems, some with different energy recovery, are available and those inherence different features and limitations. This study examines differences between exhaust air ventilation without heat recovery (F), exhaust air heat pump (FVP) and exhaust and supply air ventilation with a rotating heat exchanger (FTX) in nearly zero-energy houses. Three single-family houses in Kronoberg County were strategically chosen for the data collection, measurements, interviews and calculations to evaluate and compare their system’s performances in terms of thermal comfort, air circulation, heat recovery effects, energy use and financial attractiveness. The results show that the criteria for thermal comfort are satisfied and the specific energy consumption are within the current requirements in all these houses. Under the period of investigation, the house without heat recovery requires minimum quantity of electricity for ventilation system where as the house with FVP is the most energy efficient. Also, the house with an FVP shows to be the most cost-efficient with lowest accumulated costs. The results are limited for a specific outdoor climate during the studied period. Therefore, examinations over a longer term in different contexts are recommended for a more comprehensive view.
Rudenko, Yulia. "Reglering av pumpar: En fallstudie med jämförelseanalys mellan stryp- och frekvensreglering." Thesis, Uppsala universitet, Industriell teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-448335.
Full textToday's need for energy efficiency places high demands on the industrial sector, which is considered to be the largest energy consumer. Holmen AB is a pulp and paper producer. Pulp and paper production is an energy-intensive branch where pump applications consume large amounts of energy while playing a crucial role in the production process. This study was conducted to help the company investigate what energy and cost savings can be expected if the existing pump control method is changed. The purpose of the study was to develop an approach for estimating pump energy consumption, which would produce a basis for comparative analysis of energy consumption for different control methods. The study focuses mainly on centrifugal pumps, which dominate the industrial environment due to their robust construction, high efficiency, and relatively low maintenance needs. However, this study's approach can be used to assess different types of pumps and control modes as it is based on the fundamental fluid mechanics laws. At the beginning of the study, the key parameters that affect energy consumption in centrifugal pumps were identified to be later used in calculations. Pump control methods were discussed based on the existing literature and research. Estimation of energy consumption and costs was performed for two different control methods, throttle control, and frequency control. In the last stage of the study, two control methods were compared based on the energy consumption calculation to determine whether there is a potential for energy and cost savings when switching from throttle control to frequency control. The results show that usage of frequency control would lead to energy savings and, therefore, to savings in annual operating costs and LCC costs. The amount of the savings depends on the reduction in the rotational speed of the motor. The frequency control is most advantageous when there is a significant difference between the desired flow and the nominal flow in the system. But the potential reduction of motor and pump efficiency must be taken into consideration. A more detailed analysis of energy consumption for different flows and different types of pulp is recommended, with practically measured energy consumption values.
Westerberg, Elin. "Sänkt energiförbrukning med byte av energisystem eller energieffektivisering : Ekonomisk analys av fjärrvärme, bergvärme och luft-vatten värmepump i äldre fastigheter kontra energieffektiviseringsåtgärder." Thesis, Mittuniversitetet, Avdelningen för kemiteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-31030.
Full textDistrict heating is the dominant heating method for apartment buildings in Sweden, and its competitor is the heat pumps that have become increasingly efficient and have a better impact on the market. At the same time, the government has set the 2020 targets in order to reduce and improve Sweden's energy use. As the housing sector accounts for almost 40 percent of Sweden's total energy use, the report's purpose is to study how energy consumption for older homes can be reduced by changing energy systems or by maintaining an existing district heating system, but performing energy efficiency measures. The energy systems studied in this report are district heating, geothermal heat and air-water heat pump. The data used in the report has been largely collected from a apartment building located in Vingåker, owned by Sjötorps hus AB. In order for the results to be more general, two example houses have also been studied; A small house and a larger apartment building. The result of the study shows that the biggest cost of district heating is in operation, and thus this option is also the most expensive for the two major houses. However, both investment costs and maintenance costs are significantly higher for heat pumps and vary depending on where in the country they are to be installed, unexpected downtime and breakdowns. The result also shows that it is not profitable for a small house to switch from an existing district heating system to a heat pump. The conclusion is that energy efficiency should be the first option to reduce the energy consumption of a property, especially as the stock of older houses will increase. No matter how little the energy consumption for the newly built houses are, the older houses will be the largest part of Sweden's total housing stock. The fact that the heat pump uses less energy is no long-term solution to energy efficiency. Instead, energy efficiency actions should be the first option when the desire is reduced energy consumption.
Norlén, Mikael. "Ett matsystem med biologiska jordbruksmetoder och växthusodling : Kost, jordbruk och energibalans i växthus." Thesis, Uppsala universitet, Fasta tillståndets fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-308757.
Full textTawk, Mansour. "Etude et réalisation d'un système de refroidissement pour l'électronique de puissance basé sur la mise en mouvement d'un fluide conducteur électrique." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00586080.
Full textHu, Ming-Wen, and 胡銘文. "Research and Application of an AC MHD Pump on Seawater Desalination." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/40675575563413633701.
Full text國立臺灣海洋大學
機械與輪機工程學系
92
Abstract Magneto Hydrodynamic Theory (MHD) is a drive way based of Lorentz force in the direction perpendicular to both magnetic and electric fields. The goal of this thesis is constructing a desalination system with MHD pump by applying MHD theory. It will separate and transport the ions of seawater to another side. Furthermore, it is respected to combine with tradition desalinization technology and improve the efficiency of desalinization. If only apply the traditional DC MHD pump to seawater, it will cause the electrolysis of seawater and reduce the efficiency of desalinization seriously. Therefore, this paper utilize AC MHD pump to avoid electrolysis. It use intelligent power module (IPM) to realize a 27V 60Hz inverter for electric field and make its phase the same with AC 110V magnetic field by using digital logical circuit. It’s called phase lucked loop control (PLL). As a result, the desalination system gets the maximum Lorentz force to drive ions of seawater and improve the efficiency of desalinization. Keyword : MHD、IPM、desalination、Inverter、PLL
Tseng, Pei-Shan, and 曾珮珊. "Study of ultrafast dynamics in graphene by optical pump mid-infrared probe spectroscopy." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/17436663694962074193.
Full text國立交通大學
電子物理系所
100
Using ultrafast optical pump mid-infrared probe spectroscopy (OPMP), we study the relaxation dynamics of photoexcited carriers in monolayer and multilayer graphene. The substrate-induced charge density profile in graphene is determined through the spectra of transient reflectivity changes which are well described by carrier occupation probability near Fermi energy with tuning the probe photon energy. We succeeded in getting the Fermi energy of graphene films grown by chemical vapor deposition (CVD) on sapphire substrates. For photon energies about twice the value of the Fermi energy, the transient responses of pump-induced absorption will change to pump-induced reflection. Additionally, we analyzed the carrier-phonon coupling strength by the relaxation dynamics of carriers, which are consistent with other experimental and theoretical results. Finally, the optical pump mid-infrared probe spectroscopy would be a new technique to study the Fermi level in graphene.
Wang, Harn Jiunn, and 王函雋. "Study of Ultrafast Dynamics in Topological Insulators Bi2Se3 by Optical Pump Mid-Infrared Probe Spectroscopy." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/98581105379528119850.
Full text國立交通大學
電子物理系所
100
In this thesis, we investigated the ultrafast dynamics of carriers in topological insulators (TI) Bi2Se3 by using the homemade optical pump mid-infrared probe (OPMP) spectroscopy system. Due to the photon energy of the mid-infrared beam is about 100 meV which is smaller than the bulk bandgap of Bi2Se3 (about 300 meV), the difference between the ultrafast dynamics of carriers in bulk and surface states can be unambiguously recognized in the transient reflectivity changes spectroscopy (ΔR/R). Additionally, the signal in ΔR/R from bulk states has been certainly reduced by decreasing the pumping fluences to independently and clearly observe the ultrafast dynamics of carriers in the Dirac-cone surface state. Therefore, the relaxation model for carriers in the Dirac-cone surface state can be established with the energy loss rate of 1 meV/ps. Furthermore, the electron-phonon coupling constant was estimated to be ~0.088 near the Dirac point. Finally, the optical pump mid-infrared probe spectroscopy would be a new technique to study the Dirac-cone surface states in topological insulators.
Lin, Wen-Hao, and 林文豪. "Study of ultrafast dynamics in topological insulators by optical pump ultra-broadband mid-infrared probe spectroscopy." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/6rw49m.
Full text國立交通大學
電子物理系所
105
We investigated the ultrafast carrier dynamics of topological insulators (TIs) including Bi2Te3-xSex and Sb2Te3-xSex (x=0,1) by the optical pump and ultra-broadband mid-IR probe spectroscopy, which was performed by using four-wave difference frequency generation. The mid-IR spectrum used in this study covers the region of 200-4000 cm-1 with pulse duration of 8.2 fs. Although both of Bi-series and Sb-series TIs have the surface states, they show totally different pattern in the transient reflectivity change (ΔR/R) spectrum. Moreover, by fitting with free carrier absorption model and optical conductivity of Kubo’s formula, the ultrafast dynamics of Bi2Te3-xSex are mainly dominated by the relaxation processes of free carrier at bulk and surface states. On the other hand, the ultrafast dynamics of Sb2Te3-xSex are caused by the shift of Fermi level.
Chang, Chih-Hsuan, and 張智宣. "Study of ultrafast dynamics of pulsed-laser-deposited Cu0.5Bi2Se1.5Te1.5 thin films by optical pump mid-infrared probe spectroscopy." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/55707048344855916852.
Full text國立交通大學
電子物理系所
102
In this work, we have prepared Cu0.5Bi2Se1.5Te1.5 thin films were grown on sapphire(Al2O3)(0001) substrates by pulsed laser deposition(PLD) with various deposition temperatures. We analyzed their crystal structure and thin film quality by X-ray diffraction(XRD) and Raman spectroscopy. The physical properties in Cu0.5Bi2Se1.5Te1.5 thin films with various temperature conditions were studied by Fourier transform infrared spectroscopy(FTIR) and Hall measurement. We could find the intervalley scattering in Cu0.5Bi2Se1.5Te1.5 singal crystal by using optical pump mid-infrared probe spectroscopy(OPMP). Then we used the same system(OPMP) to measure the best condition of Cu0.5Bi2Se1.5Te1.5 thin film. And there was another signal suspected surface state signal.
Behrens, Gesa. "Was geschieht mit unangemessenen Verordnungen von Protonenpumpeninhibitoren nach Krankenhaus-Entlassung?" Doctoral thesis, 2011. http://hdl.handle.net/11858/00-1735-0000-0006-B29A-D.
Full textFier, Stefanie. "Verordnung von Protonenpumpenhemmern in der hausärztlichen Praxis." Doctoral thesis, 2004. http://hdl.handle.net/11858/00-1735-0000-0006-AF58-9.
Full textBaumann, Nicola. "Diagnostische Nachweisverfahren für Helicobacter pylori im Vergleich: Prospektive Untersuchung bei 132 Patienten der Universitätsmedizin Göttingen." Doctoral thesis, 2012. http://hdl.handle.net/11858/00-1735-0000-000D-F02F-3.
Full text