EP1170555A1 - Weather-protection grill with frost preventing device - Google Patents

Weather-protection grill with frost preventing device Download PDF

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Publication number
EP1170555A1
EP1170555A1 EP00114488A EP00114488A EP1170555A1 EP 1170555 A1 EP1170555 A1 EP 1170555A1 EP 00114488 A EP00114488 A EP 00114488A EP 00114488 A EP00114488 A EP 00114488A EP 1170555 A1 EP1170555 A1 EP 1170555A1
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EP
European Patent Office
Prior art keywords
air
defrosting
grille
weather
frost
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00114488A
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German (de)
French (fr)
Inventor
Herbert Schartmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ROX Lufttechnik GmbH
Original Assignee
ROX Lufttechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ROX Lufttechnik GmbH filed Critical ROX Lufttechnik GmbH
Priority to EP00114488A priority Critical patent/EP1170555A1/en
Publication of EP1170555A1 publication Critical patent/EP1170555A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/082—Grilles, registers or guards
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/52—Weather protecting means, e.g. against wind, rain or snow

Definitions

  • HVAC systems Air conditioning systems
  • Geological locations can include weather grilles that are built as outside air intakes are made of rain-repellent slats and a so-called bird protection grid "overgrow” by maturing.
  • the forced airflow apparently promotes that Crystal formation.
  • frost Metal structures such as wire mesh, plastic profiles and filter fibers.
  • the Outside temperature range between about -3 ° C to + 3 ° C and at certain values the hoarfrost can cross the air passage cross section in a short time close.
  • the outside air supply to the HVAC system is not secured.
  • the System is faulty.
  • the outside air grille in a known construction is equipped with an air duct Air outlet nozzles for warm air in a special arrangement in the passage cross section of the Combined outside air.
  • the nozzles allow the inflow to be warmer and drier Air from the supply air area on the pressure side from the fan of the HVAC unit, the warm exhaust air area of the exhaust air system or separately heated air.
  • the air passage cross section is narrowed, the pressure drop across the Air intake rises.
  • the flap of a bypass or the separate fan with air heater activated The emerging warm air mixes deals with the cold outside air and, depending on the nozzle configuration, prevents Warm air volume flow and air temperature in the whole cross section or in part Icing or tires.
  • everyone is supplied with outside air Weather conditions secured.
  • Outside air [1] flows through a so-called bird guard [2] and a droplet separator [3] into the outside air duct or the outside air chamber of the HVAC central unit [4].
  • the outside air intake element is completely or partially surrounded by an insulated channel [5] in which air outlet openings [6] are installed as nozzles or slots.
  • the nozzle duct will be supplied with warm supply air from the device via a bypass flap [7] and bypass duct.
  • the flap [7] opens when the differential pressure [8] rises above the suction device due to tires, ice or snow.
  • This control circuit is only activated as a function of the outside temperature [9] in winter, since an increase in pressure would also be possible due to the suction of leaves or other material in the air inlet cross section.
  • An air heater can be placed in the bypass duct to increase the air temperature to be built in. Defrosting is intensified accordingly
  • exhaust air with room temperature via a flap [10] can also be used to defrost the weather protection grille if the proximity of the exhaust air to the outside air intake enables this and there are no hygienic concerns.
  • room air from the building or tempered outside air can also be supplied to the duct [5] and the nozzles [6] for defrosting the grille [2] and droplet separator [3] via a separate fan [11] ,
  • the heating and pumping energy required is not a loss, since it benefits the supply air as preheating.
  • partial defrosting is sufficient of the intake cross-section with a reduced outside air volume flow.
  • the fans of the HVAC system are then turned on at a reduced speed - possibly in Dependence of the resistance on the weather protection grille - operated.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The weather-proof grille has rain-deflecting slats arranged horizontally or vertically, bird-deterrent grille (2) made of wire mesh, uncoated wire or punched metal plate, air ducts for dry warm air with air outlets (6) for blowing air towards the outside air inlet. At least one side of the weather-proof grille has an air duct with air outlets for discharging warm air for defrosting the outside air inlet.

Description

Problemstellung:Problem:

Raumlufttechnische Anlagen (RLT-Anlagen) haben die Aufgabe Außenluft zu filtern, diese im Winter zu erwärmen, im Sommer zu kühlen, in die zu lüftenden Räume zu transportieren und kontaminierte Abluft aus den Räumen zu fördern. In besonderen geologischen Lagen können Wetterschutzgitter, die als Außenluftansaugung gebaut werden, aus regenabweisenden Lamellen und einem sogenannten Vogelschutzgitter durch Reifansatz "zuwachsen". Der erzwungene Luftstrom fördert offenbar die Kristallbildung. Wie an jeden Grashalm oder Zweig in der Natur bereifen auch Metallstrukturen wie Drahtgitter, Kunststoffprofile und Filterfasern. Im Außentemperaturbereich zwischen etwa -3°C bis +3°C und bei bestimmten Werten der Luftfeuchtigkeit kann der Reif den Luftdurchtrittsquerschnitt in kurzer Zeit verschließen. Die Außenluftversorgung der RLT-Anlage ist nicht gesichert. Die Anlage ist gestört.Air conditioning systems (HVAC systems) have the task of filtering outside air, to heat them in winter, to cool them in summer, to the rooms to be ventilated transport and convey contaminated exhaust air from the rooms. In particular Geological locations can include weather grilles that are built as outside air intakes are made of rain-repellent slats and a so-called bird protection grid "overgrow" by maturing. The forced airflow apparently promotes that Crystal formation. As with any blade of grass or twig in nature, also frost Metal structures such as wire mesh, plastic profiles and filter fibers. in the Outside temperature range between about -3 ° C to + 3 ° C and at certain values the hoarfrost can cross the air passage cross section in a short time close. The outside air supply to the HVAC system is not secured. The System is faulty.

Bekannte Lösungsversuche:Known solutions:

Es gab Versuche mit elektrisch beheizten Wetterschutzgittem das Problem zu lösen. Die Ergebnisse waren unbefriedigend. Glattrohr-Wärmeaustauscher (Heizwasserdurchflossene Rohre) zur Frostsicherung, direkt mit dem Außenluftgitter verbunden, führen zu hohen Wärmeverlusten bei Anlagenstillstand. Die Einfriergefahr der Wärmeaustauscher selbst muß durch den Zusatz von Frostschutzmittel verhindert werden. Ein separater Warmwasserkreislauf muß erstellt werden. Diese Lösung konnte sich wegen der hohen Kosten in der Praxis nicht durchzetzen.Attempts have been made to solve the problem with electrically heated weather protection grilles. The results were unsatisfactory. Smooth tube heat exchanger (heating water flow through Pipes) for frost protection, directly connected to the outside air grille, lead to high heat losses when the system is at a standstill. The risk of freezing The heat exchanger itself must be prevented by the addition of antifreeze become. A separate hot water circuit must be created. This solution could not prevail in practice due to the high costs.

Erfindergedanke:Inventor thought:

Das Außenluftgitter in bekannter Konstruktion wird mit einem Luftkanal mit Luftaustrittsdüsen für Warmluft in spezieller Anordnung im Durchlaßquerschnitt der Außenluft kombiniert. Die Düsen ermöglichen die Zuströmung warmer und trockener Luft aus dem Zuluftbereich druckseitig vom Ventilator des RLT-Gerätes, dem warmen Fortluftbereich der Abluftanlage oder separat erwärmter Luft. Bei Reifbildung wird der Luftdurchtrittsquerschnitt verengt, der Druckfall über den Lufteintritt steigt. In Abhängigkeit des Differenzdruckes über dem Wetterschutzgitter und der Außentemperatur wird die Klappe eines Bypasses geöffnet oder der separate Ventilator mit Lufterwärmer aktiviert. Die austretende Warmluft vermischt sich mit der kalten Außenluft und verhindert je nach Düsenbestückung, Warmluftvolumenstrom und Lufttemperatur im ganzen Querschnitt oder teilweise die Vereisung bzw. Bereifung. Die Versorgung der Räume mit Außenluft ist bei allen Witterungsbedingungen gesichert. The outside air grille in a known construction is equipped with an air duct Air outlet nozzles for warm air in a special arrangement in the passage cross section of the Combined outside air. The nozzles allow the inflow to be warmer and drier Air from the supply air area on the pressure side from the fan of the HVAC unit, the warm exhaust air area of the exhaust air system or separately heated air. at The air passage cross section is narrowed, the pressure drop across the Air intake rises. Depending on the differential pressure above the weather protection grille and the outside temperature opens the flap of a bypass or the separate fan with air heater activated. The emerging warm air mixes deals with the cold outside air and, depending on the nozzle configuration, prevents Warm air volume flow and air temperature in the whole cross section or in part Icing or tires. Everyone is supplied with outside air Weather conditions secured.

Konstruktionsbeschreibung:Construction description:

Außenluft[1] strömt über ein sogenanntes Vogelschutzgitter[2] und einen Tropfenabscheider[3] in den Außenluftkanal oder die Außenluftkammer des RLT-Zentralgerätes[4]. Das Außenluftansaugelement wird von einem isolierten Kanal[5] ganz oder teilweise umgeben in den Luftauslaßöffnungen[6] als Düsen oder Schlitze eingebaut sind. Der Düsenkanal wird über eine Bypassklappe[7] und Bypasskanal mit warmer Zuluft aus dem Gerät versorgt werden. Die Klappe[7] öffnet bei Anstieg des Differenzdruckes[8] über der Ansaugeeinrichtung durch Bereifung, Eis oder Schnee. Dieser Regelkreis wird nur in Abhängigkeit der Außentemperatur[9] im Winter freigeschaltet, da ein Druckanstieg auch durch angesaugtes Laub oder anderes Material im Lufteintrittsquerschnitt möglich wäre.Outside air [1] flows through a so-called bird guard [2] and a droplet separator [3] into the outside air duct or the outside air chamber of the HVAC central unit [4]. The outside air intake element is completely or partially surrounded by an insulated channel [5] in which air outlet openings [6] are installed as nozzles or slots. The nozzle duct will be supplied with warm supply air from the device via a bypass flap [7] and bypass duct. The flap [7] opens when the differential pressure [8] rises above the suction device due to tires, ice or snow. This control circuit is only activated as a function of the outside temperature [9] in winter, since an increase in pressure would also be possible due to the suction of leaves or other material in the air inlet cross section.

Zur Erhöhung der Lufttemperatur kann in den Bypasskanal ein Lufterwärmer eingebaut werden. Die Entfrostung wird hierdurch entsprechend intensiviertAn air heater can be placed in the bypass duct to increase the air temperature to be built in. Defrosting is intensified accordingly

Statt warmer Zuluft kann auch Fortluft mit Raumtemparatur über eine Klappe[10] zum Entfrosten des Wetterschutzgitters verwendet werden, wenn die räumliche Nähe der Fortluft zur Außenluftansaugung dies ermöglicht und hygienische Bedenken nicht bestehen.Instead of warm supply air, exhaust air with room temperature via a flap [10] can also be used to defrost the weather protection grille if the proximity of the exhaust air to the outside air intake enables this and there are no hygienic concerns.

Statt Luft aus dem Zuluftsystem oder der Abluftanlage kann auch Raumluft aus dem Gebäude oder temperierte Außenluft über einen separaten Ventilator[11] dem Kanal[5] und den Düsen[6] zur Entfrostung von Gitter[2] und Tropfenabscheider[3], zugeführt werden. Die erforderliche Heiz- und Förderenergie ist kein Verlust, kommt sie doch der Zuluft als Vorwärmung zugute.Instead of air from the supply air system or the exhaust air system, room air from the building or tempered outside air can also be supplied to the duct [5] and the nozzles [6] for defrosting the grille [2] and droplet separator [3] via a separate fan [11] , The heating and pumping energy required is not a loss, since it benefits the supply air as preheating.

Je nach Intensität der Bereifung oder Vereisung genügt eine teilweise Entfrostung des Ansaugquerschnittes bei einem reduzierten Außenluftvolumenstrom. Die Ventilatoren der RLT-Anlage werden dann mit reduzierter Drehzahl - evtl. in Abhängigkeit des Widerstandes am Wetterschutzgitter - betrieben. Depending on the intensity of the tires or icing, partial defrosting is sufficient of the intake cross-section with a reduced outside air volume flow. The The fans of the HVAC system are then turned on at a reduced speed - possibly in Dependence of the resistance on the weather protection grille - operated.

Die Konstruktion eines Wetterschutzgitters mit Frostsicherung wird durch folgende Abbildungen gezeigt

Fig.1:
Schnitt durch ein Wetterschutzgitter mit umgebendem Luftkanal und Luftauslässen in Richtung Außenlufteintritt eines RLT-Zentralgerätes oder Luftkanals blasend
Fig. 2:
Ansicht eines Wetterschutzgitters mit umlaufendem Luftkanal und Luftauslässen für Warmluft zur Entfrostung.
Fig. 3:
Ansicht eines Wetterschutzgitters mit drei senkrechten und einem waagerechten angeordneten Luftkanal und Luftauslässen für Warmluft zur Entfrostung.
Fig. 4.
RLT-Zentralgerät mit Wetterschutzgitter und Entfrostung. Die Warmluft wird nach Filterung und Erwärmung druckseitig vom Zuluftventilator über Klappe und Bypaß dem Wetterschutzgitter in Abhängigkeit von Außenlufttemperatur und Druckverlust des Außenluftgitters zugeführt.
Fig. 5:
RLT-Zentralgerät für Zu- und Abluft. Die Warmluft zur Entfrostung des Außenluftgitters wird aus dem Abluftgerät der RLT-Anlage - druckseitig vom Abluftventilator - entnommen. Eine Regelung öffnet die Bypaßklappe nur bei Druckanstieg durch Bereifung in einem bestimmten Temperaturbereich.
Fig. 6:
Ein RLT-Zentralgerät mit Wetterschutzgitter und Frostsicherung erhält die Warmluft zur Entfrostung über ein eigenes kleines Luftheizgerät bestehend aus Lufterwärmer und Ventilator.
The following illustrations show the construction of a weather protection grille with frost protection
Fig.1:
Section through a weather protection grille with surrounding air duct and air outlets blowing towards the outside air inlet of an HVAC central unit or air duct
Fig. 2:
View of a weather protection grille with all-round air duct and air outlets for warm air for defrosting.
Fig. 3:
View of a weather protection grille with three vertical and one horizontal air duct and air outlets for warm air for defrosting.
Fig. 4.
HVAC central unit with weather protection grille and defrosting. After filtering and heating, the warm air is fed from the supply air fan via the flap and bypass to the weather protection grille depending on the outside air temperature and pressure loss of the outside air grille.
Fig. 5:
HVAC central unit for supply and exhaust air. The warm air for defrosting the outside air grille is taken from the exhaust air unit of the HVAC system - on the pressure side by the exhaust air fan. Regulation only opens the bypass flap when the pressure rises due to tires in a certain temperature range.
Fig. 6:
An HVAC central unit with weather protection grille and frost protection receives the warm air for defrosting via its own small air heater consisting of air heater and fan.

Claims (6)

Wetterschutzgitter mit Frostsicherung zum Einbau in ein Luftbehandlungsgerät oder einen Luftkanal, mit regenabweisenden Lamellen in waagerechter oder senkrechter Anordnung, Vogelschutzgitter aus Drahtgeflecht, Schweißdraht oder gestanztem Blech, Luftkanäle für trockene Warmluft mit Luftaustrittsöffnungen zur Lufteinblasung in Richtung Außenlufteinlaß, dadurch gekennzeichnet, daß mindestens an einer Seite des Wetterechutzgitters ein Luftkanal mit Luftauslässen zum Austritt von Warmluft zur Entfrostung des Außenlufteintrittes angeordnet ist.Weather protection grille with frost protection for installation in an air treatment device or an air duct, with rain-repellent slats in a horizontal or vertical arrangement, bird protection grilles made of wire mesh, welding wire or stamped sheet metal, air ducts for dry warm air with air outlet openings for blowing air in towards the outside air inlet, characterized in that at least on one side of the weather protection grille an air duct with air outlets for the discharge of warm air for defrosting the outside air inlet is arranged. Wetterschutzgitter mit Frostsicherung nach Anspruch 1, dadurch gekennzeichnet, daß Luftkanäle mit Luftauslässen an zwei, drei oder vier Seiten des Außenlufteintrittes angeordnet sind, oder der Ansaugquerschnitt zusätzlich oder alleine in der Mitte einen Luftkanal mit Luftauslässen zur Entfrostung aufweist.Weather protection grille with frost protection according to claim 1, characterized in that air ducts with air outlets are arranged on two, three or four sides of the outside air inlet, or the suction cross section additionally or alone in the middle has an air duct with air outlets for defrosting. Wetterschutzgitter mit Frostsicherung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß der Luftkanal zum Austritt der Warmluft diese über einen Bypass mit Klappe von Druckseite des Geräteventilators erhält.Weather protection grille with frost protection according to claim 1 and 2, characterized in that the air duct for the warm air to escape receives this via a bypass with a flap from the pressure side of the device fan. Wetterschutzgitter mit Frostsicherung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die Warmluft zur Entfrostung druckseitig vom Abluftventilator der RLT-Anlage über einen Bypass mit Klappe entnommen wird.Weather protection grille with frost protection according to claim 1 and 2, characterized in that the hot air for defrosting is taken from the exhaust air fan of the ventilation system via a bypass with a flap on the pressure side. Wetterschutzgitter mit Frostsicherung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß Warmluft zur Entfrostung von einem kleinen Luftheizgerät, bestehend aus Lufterwärmer und Ventilator zur Entfrostung dem Lufteinlaß zuströmt.Weather protection grille with frost protection according to claim 1 and 2, characterized in that warm air for defrosting flows from a small air heater consisting of air heater and defrosting fan to the air inlet. Wetterschutzgitter mit Frostsicherung nach Anspruch 1 bis 5, dadurch gekennzeichnet, daß die Warmluft zur Entfrostung des Außenluft-Eintrittsquerschnittes nur dann strömt, wenn ein Druckfühler den Druckanstieg durch Reif- oder Eisansatz gemessen hat Zusätzlich wird die Außentemperatur gemessen, um lediglich in einem frei zu wählenden Temperaturbereich im Winter - etwa zwischen -3°C und +3°C - die Entfrostung zu aktivieren.Weather protection grille with frost protection according to claims 1 to 5, characterized in that the warm air for defrosting the outside air inlet cross-section only flows when a pressure sensor has measured the pressure increase due to frost or ice build-up. In addition, the outside temperature is measured, in order to select only one Temperature range in winter - approximately between -3 ° C and + 3 ° C - to activate the defrosting.
EP00114488A 2000-07-06 2000-07-06 Weather-protection grill with frost preventing device Withdrawn EP1170555A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00114488A EP1170555A1 (en) 2000-07-06 2000-07-06 Weather-protection grill with frost preventing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP00114488A EP1170555A1 (en) 2000-07-06 2000-07-06 Weather-protection grill with frost preventing device

Publications (1)

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EP1170555A1 true EP1170555A1 (en) 2002-01-09

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EP00114488A Withdrawn EP1170555A1 (en) 2000-07-06 2000-07-06 Weather-protection grill with frost preventing device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT512454A3 (en) * 2011-10-25 2015-01-15 Holzer Tamara recirculation system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2201357A (en) * 1986-12-11 1988-09-01 Thaddeus Kowalczyk Air purifier filter for motor vehicle
US5193610A (en) * 1992-01-10 1993-03-16 Rene Morissette Defrostable ventilation system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2201357A (en) * 1986-12-11 1988-09-01 Thaddeus Kowalczyk Air purifier filter for motor vehicle
US5193610A (en) * 1992-01-10 1993-03-16 Rene Morissette Defrostable ventilation system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT512454A3 (en) * 2011-10-25 2015-01-15 Holzer Tamara recirculation system

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