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Monthly Archive for: «June, 2011»

Large and Small Wind Turbines are Different

Wind turbines are generally divided into two broad categories based on their rated capacity and their intended applications. Small wind turbines are typically less than 50 kW in size, but can be as large as… Read more

Jun 29, 2011 | Edvard

Large and Small Wind Turbines are Different

Who was James Prescott Joule?

James Prescott Joule was born on Christmas Eve 1818 into a wealthy Salford brewing family. A sickly child, he was tutored at home where he indulged his fascination for electricity by using a voltaic cell… Read more

Jun 27, 2011 | Edvard

James Prescott Joule

Typical applications of biomass

During Second World War the gasifiers were mainly employed for transportation purposes. However, in recent years the gasifiers have been employed mainly for stationary applications. For generating electricity, the producer gas from the biomass gasifier… Read more

Jun 26, 2011 | Edvard

Typical applications of biomass

Technical analysis of LED light

A Light Emitting Diode (LED) is a semiconductor device which converts electricity into light. Each diode is about 1/4 inch in diameter and uses about ten milliamps to operate at about a tenth of a… Read more

Jun 24, 2011 | Edvard

Technical analysis of LED light

How much for the geothermal energy? Impacts, hm?

Geothermal power requires no fuel, and is therefore immune to fuel cost fluctuations, but capital costs tend to be high. Drilling accounts for over half the costs, and exploration of deep resources entails significant risks…. Read more

Jun 22, 2011 | Edvard

Economics and environmental impact of geothermal power

Buchholz relay on oil transformer with conservator

The Buchholz relay has two oil-filled chambers with floats and relays arranged vertically one over the other. If high eddy currents, local overheating, or partial discharges occur within the tank, bubbles of resultant gas rise… Read more

Jun 20, 2011 | Edvard

Buchholz relay

What about the world’s wind resources?

When evaluating different methods of power generation some of the main questions inevitably concern the fuel proposed. Is there enough of it? Is it in the right places? It is available when you want it?… Read more

Jun 18, 2011 | Edvard

Causeymire Wind Farm

HIS – Highly Integrated Switchgear, Type 8DQ1

No more losing sleep over space restrictions: HIS, the gas-insulated switchgear for indoor and outdoor use requires less than half the space of comparable air-insulated switchgear. The 8DQ1-type HIS is a compact switchgear solution for… Read more

Jun 17, 2011 | Edvard

HIS - Highly Integrated Switchgear, Type 8DQ1

Thumbs down to the nuclear energy

Although for decades the arguments against nuclear power have been –and still are- strong and valid, there is an increasing group of nuclear companies supported by scientists and politicians, who say we need nuclear power… Read more

Jun 15, 2011 | Edvard

Thumbs down to the nuclear energy

How to achieve energy-efficient lighting?

Technological development has focused primarily on such things as the fluorescent lamp and the ballast and has chiefly been geared to boosting their luminous efficacy. The chart “Milestones to energy conservation with modern lighting” shows… Read more

Jun 13, 2011 | Edvard

How to achieve energy efficent lighting?

How residual current device (RCD) works?

The residual current device (rcd) is used to detect earth fault currents and to interrupt supply if an earth current flows. The main application is to prevent electrocution but RCDs can also be used to… Read more

Jun 11, 2011 | Edvard

Figure 1 - Residual current device components

How heat pump works?

The heat pump transfers the heat between the heating/cooling distribution system and the earth connection. It is the basic building block of the GSHP system. The most common type of heat pump used with GSHP… Read more

Jun 10, 2011 | Edvard

The Refrigeration Cycle (Heating Mode) of a Typical Packaged Heat Pump Unit.

Stand-Alone PV Systems

Stand-alone PV (photovoltaic) systems are used when it is impractical to connect to the utility grid. Common standalone systems include PV-powered fans, water pumping systems, portable highway signs, and power systems for remote installations, such… Read more

Jun 08, 2011 | Edvard

3000W Off-grid polar power system

ABB – AIS UniGear ZS1 design features

UniGear ZS1 is medium voltage switchgear with a metal enclosure, suitable for indoor installations. Metal partitions segregate the compartments from each other and the live parts are air-insulated. Since the switchgear is highly modular type,… Read more

Jun 06, 2011 | Edvard

ABB - AIS (air insulated switchgear) UNIGEAR ZS1


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