WO1997030315A1 - Elimination des micro-organismes des echangeurs thermiques a ventilation dotes d'un refroidissement par evaporation - Google Patents

Elimination des micro-organismes des echangeurs thermiques a ventilation dotes d'un refroidissement par evaporation Download PDF

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Publication number
WO1997030315A1
WO1997030315A1 PCT/SE1997/000112 SE9700112W WO9730315A1 WO 1997030315 A1 WO1997030315 A1 WO 1997030315A1 SE 9700112 W SE9700112 W SE 9700112W WO 9730315 A1 WO9730315 A1 WO 9730315A1
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WIPO (PCT)
Prior art keywords
air
heat
water
heat exchanger
supply
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Application number
PCT/SE1997/000112
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English (en)
Swedish (sv)
Inventor
Thunberg Svante
Original Assignee
Pen Bryn Investments Ltd.
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 Pen Bryn Investments Ltd. filed Critical Pen Bryn Investments Ltd.
Priority to AU15636/97A priority Critical patent/AU1563697A/en
Publication of WO1997030315A1 publication Critical patent/WO1997030315A1/fr

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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
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/0035—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using evaporation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F3/147—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification with both heat and humidity transfer between supplied and exhausted air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/54—Free-cooling systems

Definitions

  • the aim is to compensate the fridge-compressor in air conditioners with a new energy effective process.
  • the climatic character of the fridge-compressor is to circulate a cold medium where liquid turns to gas, and the gas back to liquid, causing a transfer of energy. It is a very costly process in energy to compress gas to liquid. This liquid has to be substituted by adding water that is evaporated in an open atmospheric system in an air to air heat-exchanger.
  • This technique can be understood as follows: One can saturate the exhaust air in the flow ducting.
  • the air can contain ca 4 weight percent water in the form of moisture at 760 mm hg at 20 grad Celsius. Water that in a cycle changes to moisture has a larger volume and a latent heat content that presses the surrounding air molecules. This process sinks the air mass temperature.
  • Our effective refrigeration system uses only energy saving techniques based on natural laws of science.
  • the invention heat-exchange combined with open evaporation is correct for use of in the environment, it is cheaper to run, it is cheaper to produce and maintain in comparison with compressors for cooling, but it needs to be adjusted to the local climate.
  • the climate of the whole day and the time of the year affect as well as the nurisment in the air to micro-biological growth and filth.
  • the invention can be used by both regenerative- recuperative/regenerative and recuperative heat exchangers.
  • the airstream will receive running water and in the form of water droplets or as steam.
  • the water cooperate with the airstream and the law of gravitation and transport, dust, particles and icro-Organisms in the heat-exchanger in order to transport them to a collector in the lower part of the heat-exchanger.
  • the airstream turns uppvard, running water, heavy water droplets, dust and other particles continue downwards and are separated from the airstream. The friction by the air will not transport the water and heavier particles upwards.
  • the first and the most important moment in cleaning and eliminating of Micro ⁇ organisms in the device for ventilation is to with regularity empty the sump at the bottom of the device
  • the sump dries out and can be heated and refilled with fresh water. This may be automatic through connection of the device to fresh water supply and recipient by means of piping.
  • the cleaning process takes the warmed up air together with the dried- out contamination, micro biological nurisment that then is set free by forced air. After sanitation the contamination is blown out of the canal system and deposited outdoor. Thereby the warmed up device is cooled and fresh water is filled in the collecting container that also function as storage of evaporating water.
  • the method of cleaning and the technical solution can be used on regenerative, regenerative/recuperative and recuperative heat-exchangers as evaporation of liquid is carried out in the system of heat exchanger where heat is supplied down stream the evaporation zone or kondensation zone.
  • the airstream is supplied with large droplets and atomised water and steam. Trough preferably allow evaporation down wards, vertical, the waterdrops will have kinetic energy downward. Then the air is led upward whereby large water drips according to the law of gravity are separated and supplied to a sump in the lower part of canal system. Only tiny water droplets, steam and evaporated water are led away.
  • the temperature of the air in the evaporasion zone is less than the outdoor and indoor temperatures. Through heat exchange the temperature of the air will increase and also the ability of the air to dissolve water on its way out of the equipment. Said warming up can be provided from fresh outdoor air or indoor air. The air that leaves the ventilation equipment will receive a higher temperature than the temperature of the air that is in the evaporation zone or condensation zone of the equipment.
  • the new technic enables the invention to free the airstream from the very tiny small waterdrips (aerosols) that cover bacteria and spread infection.
  • the process can be adjusted as to free the air aerosols and also obtain a relative humidity that creates a to bacteria and other infections negative survival conditions.
  • An evaporative ventilation system with open evaporation can be compared with a person that have been infected with a bad influenza and all the time cough and sneeze and distribute extremely tiny infected liquid drops to those around him. It is necessary to regularly eliminate micro organisms that exists in air Conditioning equipment and care for the removal of humulus products from the aggregates.
  • the exchanger will in this case be divided up in several exchange functions against respective openings as air to air exchanger try to attain the extreme temperatures.
  • the lowest temperature on the air flow acquires at the same time, however, as the separation of aerosols to the room from the plant will be the highest.
  • Aerosol separation from the arrangement can be reduced by vaporising in a bounded zone within the heat-exchanger. This means that additional energy will be added which increase the air temperature before it leaves the heat-exchanger. This state of things can occur in both flow and return air, depending on if the exchanger works like heat recoverer or coolingplant. Raised temperature in the outflowzones of the plant reduces the number of aerosols and dissolves By either place a de- humidifier in the air flow downstream the evaporative heat -exchanger or by warming the air afterwards, before it leaves the plant the number of aerosols can be reduced.
  • the aerosols can also be catched through a hygroscope filter if the fresh airs relative moisture is capable of vaporising the water. Heat must be supplied to vaporise the aerosols. This heat can when vaporising takes place downstream the heat-exchanger gasifies the condensateprecipitation that has not before been separated in the plants air flow duct.
  • a camber that assemble drops or a heat exchanger that collect heat from the air in the room result in a lower room temperature at the same time as the aerosols gasifies which reduce the risk of infection from micro organisms in the airborne water droplets.
  • the supply of heat from the room through the cover of the equipment result in that the aerosols dissolve in the heat exchanger and that the effect of cooling benefit the indoor climate at the same time as the risk for infection deminish.
  • the reality is that aerosols that carry germs infection will not be stopped by variable humidity shift.
  • a direct mixing with warm fresh air together with the damp and cool will dry up the aerosols more effective. Mixing by warm outdoor air that trough a bypass is added to the cool fresh air offer increased possibilities to control the flow and the moisture content.
  • Legionella Pneumophilia and other diseases that are infectious for people and the buildings are spread from lakes and watercourses, on land and in the air. Just these types of bacteria increase in warm water system and in the environment of a ventilation duct where water stands and the temperature is correct for bacteria to grow.
  • the bacteria spreads by air infection, by water droplets, dust or small particles (aerosols) which are in the air of a ventilation system.
  • UV-bombardment is an alternative but is not a bacteria safe result. Chemical treatment damages the cell-wall and causes the death of the bacteria.
  • the method is not reliable , work intensive and costly and dangerous for human health and the environment.
  • the most effective method to destroy bacteria and other micro organisms are trough a rise of the temperature.
  • the ventilation equipment have then to regularly be heated . preferably daily under a 10 minutes period.
  • the process can be compared with pasteurising of the micro organisms. It also dries and decomposit the rest.
  • a ventilation system In a ventilation system a large number of airborne nutriment, moisture with right degree of temperature and acidity oxygen of necessity for the metabolism and growth.
  • the nourishment consists priminarly of coal, nitrogen, sulphur, oxygen, and hydrogen.
  • Different bacteria raise different demands regarding to types for that reason there is no universal method to hinder the growth of bacteria.
  • the growth When the growth have reached a certain point the cell is ready to multiply through cell- division.
  • a Process according to the species can take 15 to 30 minutes up to several days. As continuos supply of nutrition take place by way of the air that passes trough the ventilation system the growth of bacteria and the amount of waste products grow and causes new hygienic problems.
  • Bacterius and other one-celled organisms lives in and is depending of a humid environment to be able to grow.
  • the tolerance against dehydration is poor and cause the death of the majority of the Bacterius, even if exeptions exists.
  • Many Bacterius grows and propagate faster in the dark than in the light.
  • Most Bacterius prefer light alkaline environment (pH somewhat above 7) or neutral solution.
  • the humid and by organically materials nutrious environment that exists in ventilationsystems is suitable breeding ground for fungi's and protozoa.
  • the fungi's form among others downy mycelium and gets its nutriment from organic material without assimilating energy from the sun with assistance of chlorophyll.
  • Protozoa lack cellular tissue but have cellmembrane which gives them a irregular and changing shape. They are primilarly stagnant water which points out the importance that ventilation systems with evaporisation of water regularly is dried out and being heated in order to kill different forms of micro organisms and to make it possibly to remove contamination's.
  • a liquid evaporate, as water, in a air to air heat exchanger By changing to an open evaporating system according to the invention a liquid evaporate, as water, in a air to air heat exchanger. Thereby a very positive cooling process is received that lower the temperature of the ventilated air. It is possible to improve indoor climate at the same time as destructive energy use are diminished. As principle it becomes possible to cool and heat ventilated air with the use of less than 10 percent of the energy used by compressor technics of today.
  • the technic of energy saving developed by this invention will in the future probably correspond to very profitable part of the worldmarket.
  • a technically advanced energy saving industry is possible to develop that diminish harm caused by one's environment and save limited natural resources.
  • a change from the cooling compressor technic of today to a global system that make use of air to air heat exchange with open cooling by evaporation is estimated to diminish the global outlet of carbon dioxide by 10 percent in the future. This is equivalent to 10.000 billion kilowatt hours every year as 40 percent of the global energy today is used to the purpose of indoor climate and that the ventilation correspond to more than 30 percent of this energy consumption.
  • Fresh useful ventilated air will with regenerative air to air heat exchanger be preheated or cooled to 90 percent of the temperature efficiency with energy that is recovered from exhaust air. Furthermore can the useful ventilation air that is brought into the building by evaporative cooling be cooled another 10 degrees Celsius.
  • the explanation is effective heat exchange technic and evaporisation of water. Much less energy is used to transport existing water to an open in a heat exchanger than to constantly change freon-gas to liquid in a sealed circulating system where the liquid then is changed to gas to collect heat.
  • FIG 4. show the evaporisation process.
  • the invention is based upon the very energy consuming phase change from water to gas to cool the ventilated air and the indoor climate.
  • the aim is to take away as much energy as possible by use of a process that need as much energy as possible and lead energy away from the building and installation by exhaust air.
  • More energy is used to evaporate one litre of water then to melt 7 kilo of ice.
  • Cooling efficacy i an air stream can be reached by water supply. Heat is used to increase the temperature of the water whereupon the water can be led away from the air stream. The water also can evaporate whereby heat is used to change the phase in the water to steam and gas. Heat is also used to increase the temperature of the gas. Trough cooling the out door air in a heat exchanger, further cool trough water injection, with wick or mechanical water supply, remove water surplus with refrigerating plant or absorption and have the water evaporating in the exhaust airstream before and under the heat exchange a favourable process with circulating energy quantities is reached. The invention now enables that surplus of humidity can be removed without refrigerating plant. In many of the climate zones of the earth it is enough with water injection, if the humidity supply in the premises is small.
  • the heat exchanger may comprise of several parts connected in parallel or series. It shall always be elongated in order to allow good separation of temperature.
  • the method of the invention is to provide heat from the heat exchanger when large water particles have been separated and evaporate airborne water drops and steam which have great importance to hinder the spread of living micro organisms and harmful humus impurities dissolved in water.
  • the technic with effective gasification of water is a process of cleaning.As the temperature increases the ability to dissolve water to gas increases.
  • the weight of the steam in one cubic-metre of air that has been saturated with humidity, gram The weight of the steam in one cubic-metre of air that has been saturated with humidity, gram.
  • the condense is always building up without possibility to evaporate as the air is filled with humid. When sufficient amount of condense has precipitated it pour and is diverted from the airstream and transported to evaporisation in the exhaust canal. By some rise of the temperature upstream condensing zone in the heat exchanger the condensation will be discontinued and airborne water particles and steam gasify before the fresh air is brought into the room.
  • the installation dehumidify consequently the fresh air and the humidity can be transported trough the exhaust where it is evaporated and contribute to the cooling of the fresh air.
  • the technic enables that the high humidity of the out door air is stopped from getting inside the house trough controlled ventilation.
  • the provided becomes dry and contribute to a more dry indoor climate and a increase in evaporative cooling when the air later is transported out through the ventilation system.
  • the fresh air is not dehumidified in the exchanger it becomes filled with humidity when introduced into the house and will not thereafter have the ability to dissolve an amount of air enough to reach an effective cooling by evaporisation when it is transported out of the room.
  • the additional heat will become evaporating heat at the same time as the higher temperature deminish the relative humidity of the air. This increases the ability to the air to change phase from water to steam/gas. With an effective heat exchange it thereby is possible to take away large quantities of bound energy in steam /gas from the exhaust airstream in the heat exchanger at the same time as the fresh air is cooled i the heat-exchanger To preheat the air that is to be cooled consequently increases the evaporisation process. Fans and fanmotor ought when cooling be placed on the same side of the heat exchanger as the outside air. At heat exchange wintertime they ought to be placed on the room side. The fans by then will give an additional heat of ca 10 %.
  • Outside air may before entrance into an effective air to air heat exchanger have received an higher temperature that in some ways makes it possible to cool the air through evaporating process and heat exchange to a lower temperature than the air had before it was preheated and even lower than the temperature of the exhaust. This is caused by that the exhaust air have an higher relative humidity than the outdoor air. Additional energy is needed to generate cold.
  • a specially favourable preheating is obtained when the out door air preferably is preheated by surplus energy from for example a dehumidifier run by compressor downstream the heat exchange or when the out door air passes a sun collector up stream the heat exchanger.
  • Preheating of the out door air upstream the evaporative heat exchanger that may be of regenerative, recuperative, or regenerative/recuperative combination of air to air heat exchanger makes it possible to sterilise the installation by heating and dehumidifying by pre airheater.
  • the preheater that preferably is a sunheater through which out door air passes into the ventilation system warm up the air that there after passes trough the remaining closed ventilation system and that the heated air instead of passing trough the air inlet to the room (8)it is directly connected to the exhaust air canal inlet and there after is led out of the ventilation system outdoors. Then all inside parts of the ventilation system are heated, dehumidified and sterilised from living micro organisms.
  • the preheater for outdoor air upstream the heat exchanger has at heat exchange in cold climate been tested according to the possibility to increase the temperature efficiency of the ventilation system.
  • the upstream or in beginning of the exchanger towards outdoor air open inlet provided heat is divided optimally the evaporative heat exchange process and self-regulating process for energy supply, evaporisation and effective heat exchange in elongated separation of temperatures in-between out- and indoors.
  • Cooling of ventilated air by means of heat for evaporisation have been carried out with heat exchanger. Water have in that connection been provided with exhaust air in the exhaust canal before the heat exchanger by wet cotton fibres. To provide atomised (sprinkled) water directly into the airstream have shown great advantages. To provide a small but for the evaporisation enough amount of water is of importance that the water not shall cause improved air resistance in the ventilation system.
  • Evaporisation of water in the exhaust canal occur when the exhaust air is not saturated that the air have ability to dissolve a larger amount of humidity as steam / gas. At temperature raise the air have ability to unite to a n increased amount of liquid. Exhaust air mostly have a higher air humidity and is because of that more energy rich than fresh ventilated air.
  • the low temperature of the air inlet shown i the following involves ca 50 % humidity which was the at the tests aimed airhumidity.
  • the attained results is shown to have good correspondence with theoretic estimated values.
  • Recuperative exchanger reached generally oppress result something that now due to this invention can be changed.
  • the temperature of the water is raised to evaporating temperature (formation of steam and evaporating temperature) through heat supply from the supply air canal of the heat exchanger.
  • This (the energy) is called latent evaporisation heat.
  • the specific latent evaporating heat for water at 760 mm hg is 23 x 10® joule per kilogram and the latent fusion (melting) heat 33 x 10® J/kg.
  • the energy needed to evaporate 1 kg water in the heat exchanger will be the equivalent of the energy needed to melt about 8 kg of ice. Of this cooling power the invention is able to benefit ca 90 percent.
  • Principe other types of heat exchanger may be used with preheating of the air that is meant to be cooled.
  • a matter of vital importance is that the degree of efficiency at the evaporative heat exchanger is highest possible to enable cooling of supply air below the exhaust air temperature from the room.
  • This heat is supplied to the evaporisation process from the fresh air at its passage trough the heat exchanger.
  • the heat is transferred to the accumulators of the heat exchanger or departing walls from the out door climate.
  • the evaporative process is provided with necessary heat to make latent heat by evaporation within reach of cooling.
  • This invention is a method for air to air heat exchanging and evaporative cooling and means to design these ventilation systems.
  • the invention aim at producing effective heat exchange and evaporative cooling in the heat exchanger itself as supplied air increases upstream in the heat exchanger and heat is supplied from exhaust air down stream the heat exchanger.
  • the increased ability to dissolve an increased amount of water as gas is taken care of.
  • To use this method to lead away more heat from the supplied fresh air result in a lower temperature of supplied air to the room and that evaporisation of water in the heat exchanger contribute to sink the temperature of the room.
  • the invention that is suitable on recuperative, regenerative and recuperative/regenerative heat exchangers mean that a well dimensioned amount of sprinkled water in a evaporisation zone in preferable upper part of the heat exchanger. Water that not immediately gazifies in this zone is spread as waterdrips or pouring water. The water follows the down wards aimed airstream to a combined sump and watering devise in the lower part of the exchanger where the water that not has evaporated is collected. Here the airstream change direction whereby the heavy water are separated from the airstream.
  • the advantage of evaporisation is that unsolved water particles and steam wont join the exhaust air from the ventilation system that minimise the spread of among others, as harmful micro organisms, pollution and bad odour from the ventilation.
  • the cooling of fresh air involve condensation in the heat exchanger.
  • the condense dissolve on the surface of the heat exchanger in supply air channel.
  • the weight of the liquid and low air friction at the departing walls cause the condense to separate from the airstream and pour downwards and be added to the water collecting sump of the evaporation process.
  • the invention is during the cold periods of the year a heat exchanger to recover vasted heat from exhaust air.
  • the warm ventilated air preheat the air that is ventilated indoor.
  • the method and means for heatexchange and evaporative cooling in accordance to the invention is for as well regenerative, recuperative and regenerative/recuperative type of ventilation system.
  • FIG. 1. Show the heatprocess through 1. preheater, 2 the evaporative heat exchanger where heat is changed from exhaust channel and heat reception is carried out through the evaporative process after which airborne humid and heat are leaving the ventilation system and the building.
  • Exhaust air, dark arrow at the bottom to the right Fig. 1. show that temperature loss occur in supply air in the heat exchanger upstream the dehumidifier 3. The air is cooled when it pass the cold surface of the dehumidifier 3. or absorption dehumidifier 3 that diminish the humidity of the supply air before it is provided the room.
  • FIG. 1 , 2, 3 the numbers refer to:
  • FIG.2. Show: preheater for outdoor air 1, preferably a sunheater that preheat outdoor air upstream evaporative heat exchanger 2, and the dehumidifier 3, then the airstream is led to the orifice the heat exchanger toward outdoor air.
  • preheated air is to pass trough the whole inside of the equipment and sterilise the whole equipment wit hot air which hinder survival, growth and spread of for the inhabitants and the building dangerous micro-organisms as Bacterius, virus and fungi's.
  • the sterilising process is automatic through that the channel for supplied air to the room and exhaust channel form the room is connected.
  • FIG 3. Show the air streams oh its way trough the equipment where the out door air 4, first passes the preheater, sun collector 1, heat treatment part to the dehumidifier, (not shown on FIG 3.) etc. there after passes through the air to air heat exchanger supply air system with evaporative cooling with water and after cooling dehumidifies in order to be let into the room 5, as dry air which temperature and humidity is levelled out with existing room air.
  • the air in the room is added extra humidity by personal load and humid generating activities and leakage.
  • the humidity of the room air ought by ventilation become so dry that it can solve additional humidity from the evaporation and cooling process of the heat exchanger.
  • FIG.4. Show the evaporisation process and its ability to bind the energy latent.
  • FIG. 5 Regenerative heat exchange with evaporative cooling.
  • A Supply air inlet
  • B Supply air outlet
  • D Exhaust air inlet
  • FIG. 13 Counter flow heater with common valve in between supplied air and exhaust air that at locked dampers at end point have separated canal systems and changed function.
  • heated outdoor air can first sanitate the supplied air channel system and thereafter the exhaust channel system where after the air is dismissed outdoors.
  • Water collecting means sump, to surplus water and secluded micro organisms and micro-material.
  • FIG. 14 Example on distribution of inlet and outlet on equipment seen from above.
  • FIG. 15 Example on air movement through an evaporative heat exchanger including underlying water collection means, sump, for surplus water and living and dead material.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

L'invention se rapporte à un dispositif et à un procédé visant à permettre l'évaporation de l'eau dans un échangeur thermique air-air et à recueillir et à faire circuler l'eau excédentaire provenant de l'évaporation dans l'échangeur thermique air-air et de la précipitation d'eau condensée (déshumidification de l'air). On procède à la séparation du liquide excédentaire et des éléments de contamination de l'air ventilé en permettant, de préférence, aux courants d'air d'alimentation et d'air d'évacuation dans l'échangeur thermique de se diriger vers le bas en direction d'un puisard collecteur puis de se diriger vers le haut de sorte que l'énergie cinétique et/ou le poids des particules présentes dans la matière et l'eau excédentaire les entraîne(nt) dans les puisards collecteurs en bas de l'échangeur thermique. Après ce drainage et cet assèchement, un assainissement à chaud est effectué puis l'eau pure est ajoutée et le climatiseur redémarre. Lorsqu'on a recueilli de la poussière et des micro-organismes en quantité suffisante dans le puisard collecteur, l'eau est remplacée par de l'eau propre. On procède à la stérilisation de ce dispositif en utilisant une source d'énergie pour délivrer préalablement ou en supplément un courant qu'on force à passer dans le système de canal interne ou dans des parties du dispositif qu'il réchauffe jusqu'à ce que l'environnement favorisant la survie et la croissance des micro-organismes du type bactéries, virus et champignons se dégrade à l'intérieur du dispositif et de telle sorte que l'air se débarrasse de ses aérosols. L'invention concerne également un procédé de rinçage du système de canaux de l'échangeur thermique. On équipe la partie supérieure, qui le nécessite, d'un dispositif d'arrosage conçu pour arroser et rincer le système des canaux de l'échangeur thermique.
PCT/SE1997/000112 1996-01-23 1997-01-23 Elimination des micro-organismes des echangeurs thermiques a ventilation dotes d'un refroidissement par evaporation WO1997030315A1 (fr)

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AU15636/97A AU1563697A (en) 1996-01-23 1997-01-23 The separation of microorganisms from ventilation heat-exchangers with evaporative cooling

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SE9600246-4 1996-01-23
SE9600246A SE9600246D0 (sv) 1996-01-23 1996-01-23 Avskiljning av mikroorganismer från ventilation värmeväxlare med evaporativ kyla

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
DE10255530B3 (de) * 2002-11-27 2004-07-01 Hovalwerk Ag Verfahren und Vorrichtung zum Kühlen von Umluft
CN109749926A (zh) * 2018-12-28 2019-05-14 广州市赛特检测有限公司 一种微生物气溶胶富集设备及一种空气微生物的富集方法

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US7571900B2 (en) 2002-11-27 2009-08-11 Hovalwerk Ag Method and device for cooling circulating air
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SE9600246D0 (sv) 1996-01-23

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