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Long term evaluation of an asymmetric CPC PV-thermal hybrid built for high latitudes, MaReCo (MaximumReflectorCollector), is performed in Lund, lat 55.7o, and this paper discusses output estimates and characteristics of the system. The output estimates are calculated using the MINSUN simulation program. To get the input for MINSUN, measurements were performed on two MaReCo prototypes. These measur
The aim of the study was to evaluate, from a technical and economic standpoint, the enzymatic processes involved in the production of fuel ethanol from softwood. Two base case configurations, one based on simultaneous saccharification and fermentation (SSF) and one based on separate hydrolysis and fermentation (SHF), were evaluated and compared. The process conditions selected were based mainly on
Fuel cells are hopeful for future energy systems, because they are energy efficient and able to use renewable fuels. A coupled computational fluid dynamics approach based on the finite element method, in three-dimensions, is used to illustrate a planar intermediate-temperature solid oxide fuel cell. Governing equations for momentum, gas-phase species, heat, electron and ion transport are implement
To meet EU energy and climate targets, energy efficiency of the existing building stock must be drasticallyimproved. Within IEA ECB Annex 56 one of the best practice energy renovations is a group of multi-familybuildings in Sweden, recently thoroughly renovated. Residents' perception of renovations and appraisal ofimplemented measures were captured by interviews with tenants and a literature revie
Alkaline membrane fuel cells can operate using nonprecious metals as catalysts, but rely on polymeric membranes with high hydroxide conductivity and alkali-resistance, which are hard to find. A new membrane is now reported comprising ferrocenium cations in magnetically aligned domains with an excellent combination of these properties.
As requirements regarding energy efficiency are getting tougher, buildings in the arctic, as well as the rest of the world, need to be more energy efficient without compromising a good indoor climate. This paper presents measured moisture supply and occupancy level in a Swedish Arctic multi-family building. Measurements were done during one year with readings every 30 minutes in a building consist
Avdelningen studentkommunikation och marknadsföring har följande ansvarsområden: nationell marknadsföring av utbildningar och studentrekrytering, marknadsföring för att stödja studentrekryteringen till universitetets internationella program, kommunikation med universitetets studenter samt allmänna studievägledningen.The Student Communication and Marketing unit has the following areas of responsibility: national marketing of courses and programmes and student recruitment, marketing to support student recruitment for the University’s international programmes, communication with the University’s students and general study guidance.
Massive MIMO (MaMI) is often promoted as a technology that will enable the use of low-quality, cheap hardware. One particular component that has been in the focus of MaMI-related research is the analog-to-digital converter (ADC), and use of very low-resolution ADCs has been proposed. However, studies about whether this strategy is justified from an energy-efficiency point of view have largely been
Josefin GoochProtecting Ecological Integrity in Transboundary Watercourses:An Intergrational Approach towards Implementing Environmental FlowsDatum för disputation: måndagen den 14 november 2016Fakultetsopponent: professor Dan Tarlock, Chicago-Kent College of Law, Illinois Institution of Technology, ChicagoÄmne: internationell miljörättAbstractThe thesis explores the obligation in international la
https://www.jur.lu.se/forskning/disputationer/disputationer-2016 - 2026-06-25
Increasing efforts to produce power from renewable resources and improve the efficiency of current industrial processes have turned the spotlight on organic Rankine cycles (ORC). The use of refrigerant mixtures in these cycles offers a wide range of possibilities for fluid selection and optimization. Moreover, zeotropic mixtures are reported to yield better cycle performances due to their better t
Hemicellulosic materials are among the most abundant renewable resources on earth, but have not yet found any broad application. However, if a cost effective extraction method is developed, hemicelluloses have the potential to be utilized to a much larger extent in the future. Ultrafiltration (UF) is a low energy demanding separation process that can be used to concentrate and purify hemicellulose
A key component in low energy houses is the heat recovery from the ventilation air. Over recent years, the most frequently used ventilation type is the mechanical ventilation with heat recovery. This kind of ventilation results in high heat recovery but does unfortunately consume a considerable amount of electrical energy. Natural or hybrid ventilation has the potential to consume less electricity
Studying the effects of the climate change on buildings contains two major fields: energy consumption and durability. In the field of durability the moisture effects on the building play a significant role. In Sweden the last 10-15 years have been mild and wet compared to previously. Precipitation increased considerably during the period (+11 %), whereas temperature increase were weaker (+ 0.7 oC)
This work concerns reduction of the peak flow rate of a district heating grid,a key system property which is bounded by pipe dimensions and pumpingcapacity. The peak flow rate constrains the number of additional consumersthat can be connected, and may be a limiting factor in reducing supplytemperatures when transitioning to the 4th generation of district heating.We evaluate a full year of operatio
As the total cost of renewable electricity falls lower than the price of fossil fuel, not only can electricity be used to replace fossil fuels using batteries in vehicles but it can also be used to produce fuels. This makes it possible to replace fuels in sectors not easily directly electrified. It also provides new ways of balancing the electricity system. When renewable electricity is cheap a lo
