US20070261412A1 - Air dryer in a wind power station - Google Patents

Air dryer in a wind power station Download PDF

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Publication number
US20070261412A1
US20070261412A1 US11/797,750 US79775007A US2007261412A1 US 20070261412 A1 US20070261412 A1 US 20070261412A1 US 79775007 A US79775007 A US 79775007A US 2007261412 A1 US2007261412 A1 US 2007261412A1
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United States
Prior art keywords
air dryer
cooled
air
heat
wind power
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Abandoned
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US11/797,750
Inventor
Raimo Heine
Jaakko Heikonen
Timo Koivuluoma
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ABB Oy
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ABB Oy
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Assigned to ABB OY reassignment ABB OY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOIVULUOMA, TIMO, HEIKONEN, JAAKKO, HEINE, RAIMO
Publication of US20070261412A1 publication Critical patent/US20070261412A1/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/0212—Condensation eliminators
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/0213—Venting apertures; Constructional details thereof

Definitions

  • the invention relates to an air dryer in a wind power station comprising a frequency converter with liquid cooling, the air dryer comprising a Peltier element, the first side of which is connected to an element to be cooled and the second side to a heat-receiving element, and while the element to be cooled is cooled, humidity condenses on the surface of this element.
  • the invention also relates to a method for using such an air dryer.
  • frequency converters are located either in the lower part of the tower or in a room which is not typically heated or air-conditioned.
  • Wind power station electronics are cooled in smaller devices of less than 2 MW usually by outside air, but in bigger devices the volume of air becomes so large that liquid cooling must be adopted, by which dissipation power can be conveniently transferred out of the tower.
  • a fully sealed device cannot, however, be manufactured with reasonable costs.
  • An example of a small-scale application is an air-sealed package, inside of which there is a bag containing a substance absorbing humidity from air.
  • the bag could be closed in entirely dry conditions, but this is often difficult to implement, since really dry air is required, for instance, to prevent humidity from condensing in the device during transportation, which immediately causes problems.
  • a previous air drying method in connection with wind power stations is known from publication DE 102 45 103 A1, wherein an electronics cabinet of a wind power station is dried by using a Peltier element. Air is blown via the hot side of the Peltier system and the heated air is transferred to electrical instruments, whereby the hot air binds moisture in itself and flows then to the cold side of the Peltier system, where the humidity condenses and flows finally along a channel out of the device cabinet as condensate water.
  • Publication JP 2003 93829 describes an air dryer utilizing a Peltier element but no blower. Air flow is produced in channels for hot and cold air by the gravity.
  • the method of the invention is characterized by what is disclosed in the characterizing part of claim 6 .
  • drying in the present invention is carried out locally only inside the frequency converter cabinet, if needed, drying is very rapid and it does not require much electricity.
  • Drying may be started even after a fairly long shutdown in a totally wet space without pre-drying, because the dryer itself is entirely resistant to condensate water.
  • the structure of the dryer is simple and reliable, because it does not include movable parts, such as blowers of prior art devices.
  • FIG. 1 shows an air dryer of the invention
  • FIG. 2 shows a second air dryer of the invention.
  • FIG. 1 shows an air dryer of the invention, consisting of a Peltier system with an element to be cooled 1 , such as a cooling rib set, a heat-receiving element 2 and a Peltier element 3 therebetween, which, during its operation, cools down the element 1 and transfers heat from it to the element 2 .
  • a Peltier system with an element to be cooled 1 , such as a cooling rib set, a heat-receiving element 2 and a Peltier element 3 therebetween, which, during its operation, cools down the element 1 and transfers heat from it to the element 2 .
  • the air dryer is located inside a frequency converter cabinet (not shown) of a wind power station, the cabinet being cooled with liquid cooling.
  • the heat-receiving element 2 is attached to the surface of a main water pipe 4 for liquid cooling, to which heat produced in the Peltier element 3 is transferred by means of said element 2 .
  • the element 1 is cooled to a dew temperature, at which air humidity condenses on the surface of the element 1 .
  • the use of the air dryer is controlled most preferably by a condensate water sensor 6 , which may be located in the channel 5 or, for instance, in the part of the apparatus that dries most slowly or is the most sensitive to condensate water.
  • a suitable direct-current supply is arranged for the use.
  • the dew point sensor When the temperature of the device is always kept above a certain temperature, such as at +10 degrees, in some manner, e.g. by a thermostat, the dew point sensor may be used for measuring whether the dew point is below this temperature, in which case the device is probably dry. When the temperature is measured, no preset temperature is required. In practice, one dew point sensor and a plurality of temperature measurements could be employed, but this is, however, not very likely, since dew point sensors are still quite expensive.
  • relative humidity When relative humidity is measured, it must be measured in a plurality of places or a dew point temperature must be calculated on the basis of it, since temperatures and humidity may vary greatly between the upper and lower parts of the cabinet.
  • a cheap indicator for relative humidity may be based, for instance, on bi metal strips.
  • the implementation shown in FIG. 2 differs from the solution according to FIG. 1 in that the heat-receiving element 2 is arranged in connection with piping 7 branched off the main water pipe 4 .
  • the piping 7 may then be guided through the element 2 , as shown in FIG. 2 .
  • part of the piping 7 forms the element 2 itself.

Abstract

The invention relates to an air dryer in a wind power station comprising a frequency converter with liquid cooling, the air dryer comprising a Peltier element (3), the first side of which is connected to an element to be cooled (1) and the second side to a heat-receiving element (2), and while the element to be cooled (1) is cooled, humidity condenses on the surface of this element. The air dryer is located inside a frequency converter cabinet and the heat-receiving element (2) of the air dryer is connected to contact piping (4) for liquid cooling or formed as a part of the piping. The invention also relates to a method for using such an air dryer.

Description

    BACKGROUND OF THE INVENTION
  • The invention relates to an air dryer in a wind power station comprising a frequency converter with liquid cooling, the air dryer comprising a Peltier element, the first side of which is connected to an element to be cooled and the second side to a heat-receiving element, and while the element to be cooled is cooled, humidity condenses on the surface of this element. The invention also relates to a method for using such an air dryer.
  • In wind power stations, frequency converters are located either in the lower part of the tower or in a room which is not typically heated or air-conditioned. Wind power station electronics are cooled in smaller devices of less than 2 MW usually by outside air, but in bigger devices the volume of air becomes so large that liquid cooling must be adopted, by which dissipation power can be conveniently transferred out of the tower.
  • When it is foggy, air absorbed by cooled devices is moist, wherefore the moisture resistance of the devices should be good. In air-cooled devices, salt can also enter inside the devices. If entirely closed devices were manufactured and heat was transferred away by means of a liquid, this would have great benefits also in corrosion prevention.
  • A fully sealed device cannot, however, be manufactured with reasonable costs. An example of a small-scale application is an air-sealed package, inside of which there is a bag containing a substance absorbing humidity from air. As an alternative for the bag, the device could be closed in entirely dry conditions, but this is often difficult to implement, since really dry air is required, for instance, to prevent humidity from condensing in the device during transportation, which immediately causes problems.
  • Also, delivered devices are usually opened, so even though the device would be entirely air-proof and air-sealed, air tightness disappears immediately when the device is opened.
  • A previous air drying method in connection with wind power stations is known from publication DE 102 45 103 A1, wherein an electronics cabinet of a wind power station is dried by using a Peltier element. Air is blown via the hot side of the Peltier system and the heated air is transferred to electrical instruments, whereby the hot air binds moisture in itself and flows then to the cold side of the Peltier system, where the humidity condenses and flows finally along a channel out of the device cabinet as condensate water.
  • Another known solution is shown in publication U.S. 2005/0002787 A1, which also uses the Peltier system either with or without blowers and wherein as a result of air circulation, humidity condenses on the cold side of the Peltier system. In this implementation, either the entire interior of the wind power station or its engine room is dried, and the condensate water is guided out of a collecting container. In an implementation, the heat-receiving side of the Peltier system is connected to a wall of the wind power station tower or formed by the tower wall itself.
  • Publication JP 2003 93829 describes an air dryer utilizing a Peltier element but no blower. Air flow is produced in channels for hot and cold air by the gravity.
  • In the previous solutions, it is typical that the entire interior of a wind power station or at least a large part of the interior is kept dry, whereby it is assumed that electricity consumed by the dryer is available all the time.
    • SUMMARY OF THE INVENTION
  • It is an object of the present invention to provide efficient and rapid local dehumidification in the previously mentioned wind power station. This is achieved by a solution of the invention, which is characterized in that the air dryer is located inside a frequency converter cabinet and that the heat-receiving element of the air dryer is connected to contact piping for liquid cooling or formed as a part of the piping.
  • The method of the invention is characterized by what is disclosed in the characterizing part of claim 6.
  • Since drying in the present invention is carried out locally only inside the frequency converter cabinet, if needed, drying is very rapid and it does not require much electricity.
  • Drying may be started even after a fairly long shutdown in a totally wet space without pre-drying, because the dryer itself is entirely resistant to condensate water.
  • Energy is only used during drying, and thus energy is consumed much less than in previous systems with continuous drying. Drying is only needed if the frequency converter cabinet becomes damp in special cases, because normally heat losses of the frequency converter are enough to keep humidity absent.
  • The structure of the dryer is simple and reliable, because it does not include movable parts, such as blowers of prior art devices.
    • LIST OF FIGURES
  • The invention will now be described in greater detail with preferred examples and with reference to the attached drawings, in which
  • FIG. 1 shows an air dryer of the invention; and
  • FIG. 2 shows a second air dryer of the invention.
    • DETAILED DESCRIPTION OF THE INVENTION
  • FIG. 1 shows an air dryer of the invention, consisting of a Peltier system with an element to be cooled 1, such as a cooling rib set, a heat-receiving element 2 and a Peltier element 3 therebetween, which, during its operation, cools down the element 1 and transfers heat from it to the element 2.
  • The air dryer is located inside a frequency converter cabinet (not shown) of a wind power station, the cabinet being cooled with liquid cooling. The heat-receiving element 2 is attached to the surface of a main water pipe 4 for liquid cooling, to which heat produced in the Peltier element 3 is transferred by means of said element 2. The element 1 is cooled to a dew temperature, at which air humidity condenses on the surface of the element 1.
  • Under the element 1 there is a channel 5, in which the condensate water is collected. From the channel 5 the water is then drained out of the cabinet in a controlled manner.
  • The use of the air dryer is controlled most preferably by a condensate water sensor 6, which may be located in the channel 5 or, for instance, in the part of the apparatus that dries most slowly or is the most sensitive to condensate water. A suitable direct-current supply is arranged for the use.
  • Other useful implementations for controlling the operation could be
      • an arrangement based on a temperature difference between outside and inside air, for instance, or between some components and the cold surface of the air dryer
      • an arrangement based on relative humidity, which is the most common application in previous heating arrangements
      • an arrangement based on relative humidity and temperatures
      • a dew point sensor (preset air is always kept above a certain temperature, the dew point below it)
      • an arrangement based on a dew point sensor and temperatures.
  • When the temperature of the device is always kept above a certain temperature, such as at +10 degrees, in some manner, e.g. by a thermostat, the dew point sensor may be used for measuring whether the dew point is below this temperature, in which case the device is probably dry. When the temperature is measured, no preset temperature is required. In practice, one dew point sensor and a plurality of temperature measurements could be employed, but this is, however, not very likely, since dew point sensors are still quite expensive.
  • All the above operation controls of the air dryer tend to measure the same thing but with different approaches. In principle, the easiest way is to use an arrangement based on temperature differences, but it is cumbersome to measure the temperature of a dryer surface, because, if the surface is wet all the time, it either gets dirty or organic growth develops on it, which complicates the prediction of the surface temperature, i.e. the dew point.
  • When relative humidity is measured, it must be measured in a plurality of places or a dew point temperature must be calculated on the basis of it, since temperatures and humidity may vary greatly between the upper and lower parts of the cabinet. Like cheap thermometers, a cheap indicator for relative humidity may be based, for instance, on bi metal strips.
  • The implementation shown in FIG. 2 differs from the solution according to FIG. 1 in that the heat-receiving element 2 is arranged in connection with piping 7 branched off the main water pipe 4. The piping 7 may then be guided through the element 2, as shown in FIG. 2. In principle, it is also possible that part of the piping 7 forms the element 2 itself.
  • The above description of the invention is only intended to illustrate the basic idea of the invention. A person skilled in the art may, however, modify its details within the attached claims.

Claims (7)

1. An air dryer in a wind power station comprising a frequency converter with liquid cooling, the air dryer comprising a Peltier element, the first side of which is connected to an element to be cooled and the second side to a heat-receiving element, and while the element to be cooled is cooled, humidity condenses on the surface of this element, wherein the air dryer is located inside a frequency converter cabinet and that the heat-receiving element of the air dryer is connected to contact piping for liquid cooling or formed as a part of the piping.
2. An air dryer as claimed in claim 1, wherein the heat-receiving element of the air dryer is connected to a surface of a main water pipe.
3. An air dryer as claimed in claim 1, wherein the heat-receiving element of the air dryer is arranged in connection with the piping branched off the main water pipe.
4. An air dryer as claimed in claim 1, wherein the operating energy of the air dryer is direct current.
5. An air dryer as claimed in claim 1, wherein the operation control of the air dryer is implemented by means of a condensate water sensor.
6. A method for drying air in a wind power station comprising a frequency converter with liquid cooling, wherein the drying is carried out by an air dryer comprising a Peltier element, the first side of which is connected to an element to be cooled and the second side to a heat-receiving element, and while the element to be cooled is cooled, humidity condenses on the surface of this element, by locating the air dryer inside a frequency converter cabinet, connecting the heat-receiving element of the air dryer to contact piping for liquid cooling or forming it as a part of the piping, and carrying out the drying only if necessary, without pre-drying.
7. A method as claimed in claim 6, by controlling the drying by means of a condensate water sensor.
US11/797,750 2006-05-10 2007-05-07 Air dryer in a wind power station Abandoned US20070261412A1 (en)

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FI20065310A FI20065310A0 (en) 2006-05-10 2006-05-10 Air dryer in a wind turbine
FI20065310 2006-05-10

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090165473A1 (en) * 2007-12-27 2009-07-02 Abb Oy Air dehumidifier for frequency converter arrangement
CN102562484A (en) * 2012-01-16 2012-07-11 国电联合动力技术有限公司 Radiating device of wind power generation water cooling system and water cooling system
US8256236B2 (en) 2008-02-01 2012-09-04 Gentherm Incorporated Condensation and humidity sensors for thermoelectric devices
CN103124489A (en) * 2011-11-17 2013-05-29 Abb有限公司 Method and arrangement for reducing the amount of condensed moisture inside an enclosure for electrical equipment
US9121414B2 (en) 2010-11-05 2015-09-01 Gentherm Incorporated Low-profile blowers and methods
CN105402094A (en) * 2015-12-03 2016-03-16 北京金风科创风电设备有限公司 Become oar cabinet cooling device and wind generating set
US9622588B2 (en) 2008-07-18 2017-04-18 Gentherm Incorporated Environmentally-conditioned bed
US9662962B2 (en) 2013-11-05 2017-05-30 Gentherm Incorporated Vehicle headliner assembly for zonal comfort
US9685599B2 (en) 2011-10-07 2017-06-20 Gentherm Incorporated Method and system for controlling an operation of a thermoelectric device
US9857107B2 (en) 2006-10-12 2018-01-02 Gentherm Incorporated Thermoelectric device with internal sensor
US9989267B2 (en) 2012-02-10 2018-06-05 Gentherm Incorporated Moisture abatement in heating operation of climate controlled systems
US10005337B2 (en) 2004-12-20 2018-06-26 Gentherm Incorporated Heating and cooling systems for seating assemblies
US10405667B2 (en) 2007-09-10 2019-09-10 Gentherm Incorporated Climate controlled beds and methods of operating the same
US10991869B2 (en) 2018-07-30 2021-04-27 Gentherm Incorporated Thermoelectric device having a plurality of sealing materials
US11033058B2 (en) 2014-11-14 2021-06-15 Gentherm Incorporated Heating and cooling technologies
US11152557B2 (en) 2019-02-20 2021-10-19 Gentherm Incorporated Thermoelectric module with integrated printed circuit board
US11240882B2 (en) 2014-02-14 2022-02-01 Gentherm Incorporated Conductive convective climate controlled seat
US11639816B2 (en) 2014-11-14 2023-05-02 Gentherm Incorporated Heating and cooling technologies including temperature regulating pad wrap and technologies with liquid system
US11857004B2 (en) 2014-11-14 2024-01-02 Gentherm Incorporated Heating and cooling technologies

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007054215A1 (en) * 2007-11-12 2009-05-20 Repower Systems Ag Wind energy plant with heating device

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US7061759B2 (en) * 2003-04-11 2006-06-13 Vacon Oyj Arrangement for the placement of frequency converters

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US5006905A (en) * 1988-10-07 1991-04-09 Konica Corporation Separating apparatus of transfer material
US5269146A (en) * 1990-08-28 1993-12-14 Kerner James M Thermoelectric closed-loop heat exchange system
US20050002787A1 (en) * 2001-08-10 2005-01-06 Aloys Wobben Wind energy installation
US7061759B2 (en) * 2003-04-11 2006-06-13 Vacon Oyj Arrangement for the placement of frequency converters

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10005337B2 (en) 2004-12-20 2018-06-26 Gentherm Incorporated Heating and cooling systems for seating assemblies
US9857107B2 (en) 2006-10-12 2018-01-02 Gentherm Incorporated Thermoelectric device with internal sensor
US10405667B2 (en) 2007-09-10 2019-09-10 Gentherm Incorporated Climate controlled beds and methods of operating the same
US8424320B2 (en) * 2007-12-27 2013-04-23 Abb Oy Air dehumidifier for frequency converter arrangement
US20090165473A1 (en) * 2007-12-27 2009-07-02 Abb Oy Air dehumidifier for frequency converter arrangement
US9651279B2 (en) 2008-02-01 2017-05-16 Gentherm Incorporated Condensation and humidity sensors for thermoelectric devices
US8256236B2 (en) 2008-02-01 2012-09-04 Gentherm Incorporated Condensation and humidity sensors for thermoelectric devices
US8505320B2 (en) 2008-02-01 2013-08-13 Gentherm Incorporated Climate controlled seating assembly with humidity sensor
US10228166B2 (en) 2008-02-01 2019-03-12 Gentherm Incorporated Condensation and humidity sensors for thermoelectric devices
US9335073B2 (en) 2008-02-01 2016-05-10 Gentherm Incorporated Climate controlled seating assembly with sensors
US11297953B2 (en) 2008-07-18 2022-04-12 Sleep Number Corporation Environmentally-conditioned bed
US10226134B2 (en) 2008-07-18 2019-03-12 Gentherm Incorporated Environmentally-conditioned bed
US9622588B2 (en) 2008-07-18 2017-04-18 Gentherm Incorporated Environmentally-conditioned bed
US10288084B2 (en) 2010-11-05 2019-05-14 Gentherm Incorporated Low-profile blowers and methods
US9121414B2 (en) 2010-11-05 2015-09-01 Gentherm Incorporated Low-profile blowers and methods
US11408438B2 (en) 2010-11-05 2022-08-09 Gentherm Incorporated Low-profile blowers and methods
US10208990B2 (en) 2011-10-07 2019-02-19 Gentherm Incorporated Thermoelectric device controls and methods
US9685599B2 (en) 2011-10-07 2017-06-20 Gentherm Incorporated Method and system for controlling an operation of a thermoelectric device
CN103124489A (en) * 2011-11-17 2013-05-29 Abb有限公司 Method and arrangement for reducing the amount of condensed moisture inside an enclosure for electrical equipment
CN102562484A (en) * 2012-01-16 2012-07-11 国电联合动力技术有限公司 Radiating device of wind power generation water cooling system and water cooling system
US10495322B2 (en) 2012-02-10 2019-12-03 Gentherm Incorporated Moisture abatement in heating operation of climate controlled systems
US9989267B2 (en) 2012-02-10 2018-06-05 Gentherm Incorporated Moisture abatement in heating operation of climate controlled systems
US10266031B2 (en) 2013-11-05 2019-04-23 Gentherm Incorporated Vehicle headliner assembly for zonal comfort
US9662962B2 (en) 2013-11-05 2017-05-30 Gentherm Incorporated Vehicle headliner assembly for zonal comfort
US11240882B2 (en) 2014-02-14 2022-02-01 Gentherm Incorporated Conductive convective climate controlled seat
US11240883B2 (en) 2014-02-14 2022-02-01 Gentherm Incorporated Conductive convective climate controlled seat
US11033058B2 (en) 2014-11-14 2021-06-15 Gentherm Incorporated Heating and cooling technologies
US11639816B2 (en) 2014-11-14 2023-05-02 Gentherm Incorporated Heating and cooling technologies including temperature regulating pad wrap and technologies with liquid system
US11857004B2 (en) 2014-11-14 2024-01-02 Gentherm Incorporated Heating and cooling technologies
CN105402094A (en) * 2015-12-03 2016-03-16 北京金风科创风电设备有限公司 Become oar cabinet cooling device and wind generating set
CN105402094B (en) * 2015-12-03 2019-07-26 北京金风科创风电设备有限公司 Become oar cabinet cooling device and wind generating set
US11223004B2 (en) 2018-07-30 2022-01-11 Gentherm Incorporated Thermoelectric device having a polymeric coating
US11075331B2 (en) 2018-07-30 2021-07-27 Gentherm Incorporated Thermoelectric device having circuitry with structural rigidity
US10991869B2 (en) 2018-07-30 2021-04-27 Gentherm Incorporated Thermoelectric device having a plurality of sealing materials
US11152557B2 (en) 2019-02-20 2021-10-19 Gentherm Incorporated Thermoelectric module with integrated printed circuit board

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DE202007006592U1 (en) 2007-09-06
FI20065310A0 (en) 2006-05-10

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