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The entropy generation analysis of fully-developed turbulent heat transfer flow in inward helically corrugated tubes was numerically performed by using a Reynolds stress model. The simulations were conducted for a smooth tube and five cases of corrugated tubes with Reynolds number (Re) ranging from 10,020 to 40,060 at a constant wall temperature condition. The effects of corrugation pitch and heig
The Natural gas Combined Cycle (NGCC) with post combustion capture using liquid solvents may in some cases be of interest to design with a flexible steam bottoming cycle, so that it can operate both with and without CO2 capture. It is then important that the choice of the low pressure (LP) steam turbine exhaust size is made accordingly. The paper describes why a flexible NGCC requires a LP steam t
We have used synchrotron X-ray diffraction experiments to measure the strain field introduced by a hydride blister grown on a section of a pressure tube from a CANDU nuclear reactor. After charging the tube section with a homogeneous hydrogen concentration of 300 wt ppm, the blister was produced by creating a small cold spot on its surface (similar to 200 degrees C), while the bulk was kept at a t
To satisfy the great need for (opto-)electronic devices to become smaller and more efficient in energy and price, research is done on semiconducting III-V nanowires (NWs). Electrical devices using NWs show noteworthy assets being fast-paced with high-speed electronics and low power consumption, one of which are high-efficient solar cells at a moderate price. Developing electric devices it turns
Denna studie ämnar att redogöra potentialen för energigemenskaper i Näsby, Kristianstad. Detta utreds i arbetet genom att undersöka om lokalnätet kan avlastas, samt om elnätskunderna kan erhålla kostnadsbesparingar. Rapporten är ett examensarbete för en civilingenjörsexamen i maskinteknik på Lunds Tekniska Högskola, och utförs tillsammans med C4 Energi AB. Studien omfattar en litteraturstudie som The aim of this study is to examine the potential of energy communities in Näsby, Kristianstad, and more specifically the values they may provide the involved parties. This report is a Master’s thesis written at Lunds Tekniska Högskola, in collaboration with C4 Energi AB. The study involves a literature study with the purpose of determining in what form an energy community could be constructed in
Limiting global warming to ‘safe’ levels will require rapid and radical reductions of greenhouse gas emissions across all sectors of the global economy. The discontinuation of incumbent industrial structures, that will be an unavoidable part of such sustainability transitions, will disproportionally burden certain groups. Recent events including the social and political unrest linked to the immine
The attachment of the 2,2′-bipyridine (bpy) moieties to the surface of planar silicon(111) (photo)electrodes was investigated usingab initiosimulations performed on a new cluster model for methyl-terminated silicon. Density functional theory (B3LYP) with implicit solvation techniques indicated that adventitious chlorine atoms, when present in the organic linker backbone, led to instability at very
Novel soil remediation equipment based on electro-kinetic geosynthetics (EKG) was developed for in situ isolation of metals from paddy soil. Two mutually independent field plot experiments A and B (with and without electric current applied) were conducted. After saturation using ferric chloride (FeCl3) and calcium chloride (CaCl2), soil water drainage capacity, soil cadmium (Cd) removal performanc
För att motverka den globala uppvärmningen sker i nuläget en övergång till förnybara energikällor, bland annat genom att injicera biometan i naturgasnätet. Integrationen av gas från olika källor har dock lett till ett problem: svavelutfällningar. Detta fenomen kan leda till att rör och utrustning går sönder och inte fungerar som de ska, samt en hälsorisk för operatörerna. År 2021 upptäcktes svavTo mitigate global warming, a shift towards renewable energy sources is in motion, including introducing biomethane into natural gas grids. However, the integration of gas from various sources has led to a problem known as elemental sulphur deposition. This phenomenon may lead to the breakdown and malfunction of pipes and equipment, posing health hazards to operators. In 2021 solid sulphur depos
Adipocytes play a central role in energy balance, and dysfunctional adipose tissue severely affects systemic energy homeostasis. The ATPase EH domain-containing 2 (EHD2) has previously been shown to regulate caveolae, plasma membrane-specific domains that are involved in lipid uptake and signal transduction. Here, we investigated the role of EHD2 in adipocyte function. We demonstrate that EHD2 pro
Exploitation of alum shale is a controversial subject in Sweden due to the history of pollution of the environment and groundwater, from past mining industries. The extraction of vanadium from alum shale is no different. Nevertheless the metal is a valuable resource used in tools, building, industries and aerospace materials. A look to the future reveals that vanadium may play a role in renewable
Byggproduktion idag, innebär bland annat en hög energianvändning, utsläpp av växthusgaser, användning av miljöfarliga ämnen samt stora mängder avfall som måste hanteras. Detta är aspekter som samtliga behöver minskas för att reducera branschens stora miljöpåverkan. Inom byggsektorn har klimatarbetet fått en alltmer ökad uppmärksamhet med införandet av olika klimatkrav på nationell och EU-nivå. I oCarbon offsets, essential in climate-related aspirations for governments and businesses, entail reducing, avoiding, or extracting greenhouse gases from the atmosphere, even if not contemporaneous with emissions. They include, among others, energy-efficient solutions and renewable energy investments. These compensations, voluntary or regulated, must meet reliability criteria. Actions, such as Carbo
Byggproduktion idag, innebär bland annat en hög energianvändning, utsläpp av växthusgaser, användning av miljöfarliga ämnen samt stora mängder avfall som måste hanteras. Detta är aspekter som samtliga behöver minskas för att reducera branschens stora miljöpåverkan. Inom byggsektorn har klimatarbetet fått en alltmer ökad uppmärksamhet med införandet av olika klimatkrav på nationell och EU-nivå. I oCarbon offsets, essential in climate-related aspirations for governments and businesses, entail reducing, avoiding, or extracting greenhouse gases from the atmosphere, even if not contemporaneous with emissions. They include, among others, energy-efficient solutions and renewable energy investments. These compensations, voluntary or regulated, must meet reliability criteria. Actions, such as Carbo
Ultra-low power (ULP) biomedical implants and sensor nodes typically require small memories of a few kb, while previous work on reliable subthreshold (sub-VT) memories targets several hundreds of kb. Standard-cell based memories (SCMs) are a straightforward approach to realize robust sub- VT storage arrays and fill the gap of missing sub-VT memory compilers. This paper presents an ultra-low-leakag
Currently, the Free electron laser user facility FLASH at DESY is undergoing a significant upgrade involving the complete transformation of one of its beamlines to allow external seeding. With the Echo-Enabled Harmonic Generation (EEHG) seeding method, we aim for the generation of fully coherent XUV and soft X-ray pulses at wavelengths down to 4 nm. The generated FEL radiation is sensitive to vari
Regulations for work involving fume hoods/benchesWork involving fume hoods and fume benches is affected by various factors, including the surrounding environment, individual work methods, and the design of supply and extraction air systems.Incorrect work methods can easily compromise the effectiveness of fume hoods and fume benches, leading to reduced safety.Fume hoods and fume benches are equippe
https://www.kc.lu.se/en/employee/general-safety-regulations/4-general-rules/43-ventilated-workstations - 2026-07-03
Regulations for work involving fume hoods/benchesWork involving fume hoods and fume benches is affected by various factors, including the surrounding environment, individual work methods, and the design of supply and extraction air systems.Incorrect work methods can easily compromise the effectiveness of fume hoods and fume benches, leading to reduced safety.Fume hoods and fume benches are equippe
