1,721,079 research outputs found
Small-scale biomass-fired cogeneration, pellet production or district heating: new criteria for selecting the most profitable solution
No full textIn this paper the possible use of heat surplus from a biomass-fired cogeneration unit,
for treating a share of the biomass and produce a new and more performing fuel like pellet, is
proposed and discussed. Such a fuel could be easily stored and then distributed, for a more
widespread and diffused utilization close to the consumers, for heating purposes. This form of
energy storage makes time and geographical shift of heat utilization possible, also in small-scale
applications. A technical-economical comparison is carried out and discussed between the above
mentioned system and a district heating supplied by a traditional biomass boiler, or a
conventional chip-fired cogeneration plant without pellets production.
The paper also focuses on the opportunities and challenges deriving from the energy use of a
specific biomass resource: olive pomace. The technical feasibility and the economical profitability
of different plant solutions are investigated.
To a methodological contribution, related to the description and modeling of the proposed
conversion processes, some case-studies are joined, based on efficiencies and costs suggested by
the most recent literature and field tests
Technical-economical comparison between cogeneration, pellet production and thermal uses of biomass
No full textThe logistics for the collection of energy biomasses is a major constraint in areas with severe orography, lack of transportation infrastructures and dispersed land ownership.
The use of small size units eases this process for it reduces the extension of the gathering area. Nevertheless, small size means low electrical efficiency and high specific costs. Many yearly operating hours are required for making a small plant become a cost effective solution. A difficult compromise must be settled, between the proximity of the plant to the woodland and the presence of a local heat demand, for a full exploitation of the power output.
This paper discusses the idea of using the heat surplus of a biomass-fired cogeneration unit to treat a share of the biomass and produce fuel like pellet, to be stored and distributed for heating purposes. This form of thermal energy storage makes time and geographical shift of heat utilization possible, also in small-scale applications.
A technical-economical comparison is carried out and discussed between the above mentioned system and a district heating supplied by a traditional biomass boiler, or a conventional chip-fired cogeneration plant without pellets production. The economic profitability of different plant solutions is investigated in some case-studies
Electric mobility systems: possible providers of energy services to active distribution networks?
No full textLa dinamica dei conduttori sospesi in caso di corto circuito: due modelli matematici semplificati
No full textActive shielding of overhead line magnetic field: Design and applications
No full textThe paper presents the successful field application of active shielding of the magnetic field of HV overhead
lines. Two plants have been deployed and are being operated since some years on a 132-kV and a 400-
kV line. The solutions adopted minimize the impact on the line structure. Also the configuration of the
control systems has been studied in order to avoid any impact on the normal operation of the line. Two
different solutions were used; the first is based on a current sensor and a radio transmitter–receiver
system, the second relies on the mutual effect between the line and the shield wires thus not requiring
any device installed on the power conductors.
Both systems have been continuously operated for some years and have assured to keep the magnetic
field at the sensitive targets below the desired limits
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