785 uppsatser · sida 7 av 53
Utredning av åtgärder för ventilation, värme och kyla
… for the different areas have been divided into two different parts, electricity- and heat consumption. Electricity consumption is roughly 500 MWh per year and the heat consumption is around 1020 MWh per year. This is only the consumption of the areas that have been investigated …
… main areas is made. Primarily the photovoltaic system is sized based on the electricity consumption in the buildings. Furthermore an assessment is made whether or not the photovoltaic system is a profitable investment. Lastly a comparison between the output of the analysis and …
En analys av den framtida driften av ett svenskt elna’t
… of energy use is taking place in Sweden and throughout all of Europe. Electricity is an important part in our society’s energy system which means that the electrical grid operators and associated therewith has a central role in this work. Monitoring and controlling the …
En kvantitativ studie gällande hållbara uppvärmningsalternativ på en skärgårdsö
… cottages used for overnighting. The cottages now run solely on direct electricity, both for heating and hot water. The purpose of this report is to survey the current energy use of the four cottages with respect to the environmental effect and to propose alternative heating …
jämförelse av befintlig pastörisering med integrerad termofil hygienisering på Kungsängens gårds biogasanläggning i Uppsala
… other with non-pasteurized substrate. For the present pasteurization system, electricity and heat demand was surveyed. For the integrated thermophilic sanitation, a process design was developed and dimensioned and the electricity and heat demand was calculated. Thereafter, the …
jämförelse av befintlig pastörisering med integrerad termofil hygienisering på Kungsängens gårds biogasanläggning i Uppsala
… other with non-pasteurized substrate. For the present pasteurization system, electricity and heat demand was surveyed. For the integrated thermophilic sanitation, a process design was developed and dimensioned and the electricity and heat demand was calculated. Thereafter, the …
En studie med syftet att lösa energibehovet för ett specifikt hus.
… to assess as to its environmental impact. This due to the fact that it uses electricity as fuel. This electricity is hard to predict the source of. If the source is renewable it could be argued that the heat pump is the most environmental positive choice. If the source on the …
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 …
In electricity markets evolving towards liberalisation and internationalisation, green certificates are seen as an important tool to promote production of renewable energy. In a green certificate market producers sell certificates received per unit of electricity generated from …
… A barrier, which control when the horses are to be fed, is controlled by an electrical motor. The control signal from the control system is a digital signal, which allows the electrical motor to open the barrier and feed the horses. When this is done, the barrier closes and the …
en biologisk bekämpningsmetod mot ogräs
Unwanted vegetation on the land of electric transforming stations is a problem, in the sense that it contributes to higher fire risks and also constitutes an obstacle for people performing maintenance operations at the station. Such unwanted vegetation is controlled using …
- En studie av teknik-, ekonomi- och miljöfrågor
… the future position that small scale hydro production will have on the Nordic electricity market is also carried out. This is done by an inventory of technology and economic and environmental aspects. The inventory is also a guide as to how the project should be implemented …
… months, when the climate demands our houses to be heated, the relation of 8 % electricity and 90 % heat is very suiteble. Unfortunatly problems can occure during the summer time when we do not need to heat our houses. A result of producing electricity is heat. When wanting …
… The rotation speed for the Wobble plate pump was computed for a 4-pole electric motor but during testing a 2-pole electric motor was used. Therefore the rotation speed had to be decreased by using a variable frequency drive (VFD). The disadvantage of decreasing the frequency is …
… popularity. The reasons for this are among other things the increasing cost of electric energy and enviromental concern. In this thesis the connection of these micro-power wind energy convertors to the utility network is discussed. Electric standards for the connection of small …
