364 uppsatser · sida 10 av 25
Electricity production from renewable energy resources such as wind energy and photovoltaics is variable. Integration of these intermittent resources into the electricity system leads to new challenges in how to manage imbalance between supply and demand on the grid. One way to …
en jämförelse mellan två olika foder
… feed with a sufficient level of amino acids but with relatively low energy content. This is to keep the chickens healthy without getting too heavy. If they do get too heavy they often tend to get leg and feet problems. The result of the study showed no large differences in …
Med hänsyn till elprisets variationer
… of electricity is a combination of economic and technological development, energy prices, economic structure, population changes and weather. Different scenarios for the electricity price were therefore examined. In the base case, the electricity price was given by the Nord Pool …
underlying factors in peri-urban land use
… when productive crop land is in demand not only for food production but also energy- and fodder production. On top of that there is an obvious conflict of goals between agricultural production and non-agricultural exploitation of agricultural land. In several emerging economic …
… be reconsidered. Nature- and cultural values are obvious, also the unutilized energy in the grass. The suitable types of wetland that were specifically studied were the productive wetlands; meadow marshes and wet meadows. These wetlands are represented in the Swedish meadow- and …
… out to compare the different public transport modes in Stockholm city. Both energy consumption and air pollution are compared. The chosen transport methods are car, bus and metro. Traditionally the rail industry has had environmental arguments as a strong competitive advantage …
Bestämning av verkningsgrad
… pressurization and after that used as fuel for vehicles.The usage of support energy in the biogas process is essentially district heating, electricity and oil. Theoverall efficiency term is the energy produced in the gas minus the supporting energy divided with theenergy from …
as an indiction of hunger
… in which pigs are feed is an important aspect. Feed does not only provide the energy and nutrients critical for survival, but feeding is also associated with a number of other factors contributing to well-being and reproduction. Today the feed for gestated sows is often composed …
… potential is examined - how much food waste biogas generates and how much energy it corresponds to. Food waste is broken down by microorganisms under anaerobic conditions (anaerobic digestion) in a biogas plant. The final product of the digestion of food waste is raw biogas and …
There are several energy systems in the Swedish society and to ensure the comfort and health of the citizens it is of importance that the different energy systems are functioning properly. District heating is one of these energy systems and many household depend only on district …
… equipment in building 111 it can be mentioned that it is both old and energy demanding which leads to increased energy costs. If a change of existing equipment is being made, TPPM AB can save approximately 70 000 SEK per year at a temperature of +15 °C. This correspond a …
Hantering och layout
Seabased Industry AB develops system for extracting electrical energy from ocean waves with a Wave Energy Converter (WEC). The components is bought from subcontractors and then assembled into wave energy converters, buoys and marine substations by Seabased. In the future …
… from 15 to 3 bars, before six absorption heat pumps. During the process the energy is conserved but losses occur in form of exergy. The aim of this thesis is to reduce the losses of exergy. This can be done by letting turbines replace the pressure reducing valves. In this thesis …
… have been includedin the survey, in which the quantity of chemicals, water and energy use and carbonemissions were calculated per work wear trousers of the minimum order.Compilation of results indicates the use of 2,5 kg chemicals, 10,3 liters water,756Wh energy and 0,4 kg …
… to establish 1000 new households in Gunsta before year 2030. The required energy for heating houses and water would be distributed via a district heating system, which also includes 200 existing residences. The annual required energy, according to this study, would be 16.2 GWh …
