2009 in Namibia: Difference between revisions
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'''2009 in Namibia''' refers to the events which occurred and will occur in the year of [[2009]] in the [[Namibia|Republic of Namibia]]. |
'''2009 in Namibia''' refers to the events which occurred and will occur in the year of [[2009]] in the [[Namibia|Republic of Namibia]]. |
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high frequency heating,induction heating,induction heating machine |
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==Economics== |
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http://www.gpgyjr.com.cn |
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In January, the [[International Monetary Fund]] predicted [[economic growth]] would drop by 50% in 2009, from 4% to 2% due to the [[global recession]].<ref>[http://www.namibian.com.na/news/full-story/archive/2009/january/article/imf-says-only-2-growth-for-namibia-in-2009/ IMF says only 2% growth for Namibia in 2009] The Namibian, 8 January 2009</ref> |
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How does Induction Heating work ? |
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A source of high frequency electricity is used to drive a large alternating current through a coil. This coil is known as the work coil. See the picture opposite. |
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The passage of current through this coil generates a very intense and rapidly changing magnetic field in the space within the work coil. The workpiece to be heated is placed within this intense alternating magnetic field. |
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Depending on the nature of the workpiece material, a number of things happen... |
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The alternating magnetic field induces a current flow in the conductive workpiece. The arrangement of the work coil and the workpiece can be thought of as an electrical transformer. The work coil is like the primary where electrical energy is fed in, and the workpiece is like a single turn secondary that is short-circuited. This causes tremendous currents to flow through the workpiece. These are known as eddy currents. |
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In addition to this, the high frequency used in induction heating applications gives rise to a phenomenon called skin effect. This skin effect forces the alternating current to flow in a thin layer towards the surface of the workpiece. The skin effect increases the effective resistance of the metal to the passage of the large current. Therefore it greatly increases the heating effect caused by the current induced in the workpiece. |
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(Although the heating due to eddy currents is desirable in this application, it is interesting to note that transformer manufacturers go to great lengths to avoid this phenomenon in their transformers. Laminated transformer cores, powdered iron cores and ferrites are all used to prevent eddy currents from flowing inside transformer cores. Inside a transformer the passage of eddy currents is highly undesirable because it causes heating of the magnetic core and represents power that is wasted.) |
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Da Wei Induction Heating Machine Co.,Ltd |
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ADD:Pingxiang,Jiangxi,(or DongGuan,GuangDong or QingDao,ShanDong)China |
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Tel:86-0799-7232075 SKYPE:Cali0086 |
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Fax: 86-0799-7232075 MSN:chensongliang333@hotmail.com |
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E-mail:inductionheating@gpgyjr.com.cn /admin@gpgyjr.com.cn |
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Web:http://www.gpgyjr.com.cn |
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http://www.induction-heating.com.cn |
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==Politics== |
==Politics== |
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Revision as of 07:46, 28 January 2009
See also: 2008 in Namibia, other events of 2009, 2009 in Namibian sport, 2010 in Namibia and the Timeline of Namibian history.
2009 in Namibia refers to the events which occurred and will occur in the year of 2009 in the Republic of Namibia.
high frequency heating,induction heating,induction heating machine http://www.gpgyjr.com.cn How does Induction Heating work ?
A source of high frequency electricity is used to drive a large alternating current through a coil. This coil is known as the work coil. See the picture opposite.
The passage of current through this coil generates a very intense and rapidly changing magnetic field in the space within the work coil. The workpiece to be heated is placed within this intense alternating magnetic field.
Depending on the nature of the workpiece material, a number of things happen...
The alternating magnetic field induces a current flow in the conductive workpiece. The arrangement of the work coil and the workpiece can be thought of as an electrical transformer. The work coil is like the primary where electrical energy is fed in, and the workpiece is like a single turn secondary that is short-circuited. This causes tremendous currents to flow through the workpiece. These are known as eddy currents.
In addition to this, the high frequency used in induction heating applications gives rise to a phenomenon called skin effect. This skin effect forces the alternating current to flow in a thin layer towards the surface of the workpiece. The skin effect increases the effective resistance of the metal to the passage of the large current. Therefore it greatly increases the heating effect caused by the current induced in the workpiece.
(Although the heating due to eddy currents is desirable in this application, it is interesting to note that transformer manufacturers go to great lengths to avoid this phenomenon in their transformers. Laminated transformer cores, powdered iron cores and ferrites are all used to prevent eddy currents from flowing inside transformer cores. Inside a transformer the passage of eddy currents is highly undesirable because it causes heating of the magnetic core and represents power that is wasted.)
Da Wei Induction Heating Machine Co.,Ltd ADD:Pingxiang,Jiangxi,(or DongGuan,GuangDong or QingDao,ShanDong)China Tel:86-0799-7232075 SKYPE:Cali0086 Fax: 86-0799-7232075 MSN:chensongliang333@hotmail.com E-mail:inductionheating@gpgyjr.com.cn /admin@gpgyjr.com.cn Web:http://www.gpgyjr.com.cn
http://www.induction-heating.com.cn
Politics
The 2009 general election will take place in November. Two candidates, current President Hifikepunye Pohamba of the SWAPO party and former cabinet minister Hidipo Hamutenya of the Rally for Democracy and Progress were confirmed by their party's as candidates for President for the election while other parties were expected to annouce their candidates later in the year.
Sport
On 2 January, boxer Paulus Moses beat Yusuke Kobori of Japan to win the World Boxing Association (WBA) lightweight title.[1]
In May, 4 Deserts will host RacingThePlant: Namibia 2009, which is a 7 day, 6 stage footrace between Keetmanshoop and Lüderitz in Karas Region, southern Namibia.[2]
Deaths
- Eben van Zijl, 71, former White politician in South West Africa, the forerunner to Namibia
References
- ^ Namibia's Moses becomes new WBA lightweight champion Agence France-Presse, 2 January 2008
- ^ Namibia 2009 at 4deserts.com
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