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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… 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… 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… 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… Read more

Jun 24, 2011 | Edvard

Technical analysis of LED light

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… 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… 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… 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… 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… 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… 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… 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… Read more

Jun 06, 2011 | Edvard

ABB - AIS (air insulated switchgear) UNIGEAR ZS1


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