Patent Description:
Evaporative humidifiers and cooler apparatuses are used to humidify and cool different types of spaces in buildings. Electric equipment within a building may generate heat, which increases the temperature within the building. Increased temperature may decrease the performance of the equipment. Electric equipment may also be sensitive to static electricity. If the humidity in a space within the building falls below a certain level, static electricity may be generated.

Evaporative humidifiers and cooler apparatuses comprises an inorganic non-combustible cooling and humidification media, also known as an evaporative media. Fluid, such as water, is supplied to the top of the evaporative media via a fluid distribution element. The water flows down the evaporative media, which may have a corrugated surface. As warm and dry air passes through the evaporative media, it evaporates a proportion of the water and thus produces cold, humidified air. The rest of the water assists in washing and cleaning the evaporative media, and is drained to a fluid tray. The warm and dry air may be directed through the evaporative media by means of a forced air flow, which is generated by a fan.

The energy that is needed for the evaporation of the fluid is taken from the air itself. The air that leaves the apparatus is therefore humidified and cooled simultaneously without any external energy supply for the evaporation due to an adiabatic cooling process.

The tray is filled with fluid from a fluid supply. When there is a humidity and cooling demand, a pump starts and circulates the fluid over the evaporative media via the fluid distribution element. The fluid may contain a certain amount of minerals and salts with a predetermined concentration. During the evaporation, the fluid is released to the air. The minerals and salts remain in the fluid and are returned to the fluid tray. A proportion of the fluid in the fluid tray is continually drained and replaced with fresh fluid from the supply in order to control the mineral concentration.

<CIT> discloses a system and a method for air cleaning by the means of chlorine dioxide. The device is provided with humidification media configured to receive an evaporative fluid, a fluid distribution element for distributing the fluid, a tray for collecting the fluid according to the preamble of claim <NUM> and claim <NUM> respectively.

<CIT> discloses a device for humidification of an airflow wherein a pH-value of the aqueous solution is controlled and an acid or a brine is added accordingly.

<CIT> discloses a system for cooling a fluid comprising a filter unit a pump and a tray for collecting the fluid wherein a cleaning agent for descaling is added to the fluid either on a regular scheduled basis or when scale is visually identified on the surface of the tank, the evaporative pads or the pipes.

In addition to the remaining minerals and salts in the fluid, also bacteria and fungi may be formed in the fluid and on the cooling and humidification media. Minerals, salt, bacteria and/or fungi in the fluid may also result in deposits and sediments on the cooling and humidification media, resulting in a need for de-scaling of the cooling and humidification media.

Thus, there is a need to develop a method for cleaning an evaporative humidifier and cooler apparatus, which is based on the condition of a cooling and humidification media of the apparatus. There is also a need to develop a computer program and a computer-readable medium for executing the method. Also, there is a need to develop a system comprising an evaporative humidifier and cooler apparatus for humidification and cooling of air, which evaporative humidifier and cooler apparatus is cleaned based on the condition of a cooling and humidification media of the apparatus.

The object of the invention is therefore to develop a method for cleaning an evaporative humidifier and cooler apparatus, which is based on the condition of a cooling and humidification media of the apparatus.

A further object of the invention is to develop a computer program and a computer-readable medium for executing the method.

Another object of the invention is to develop a system comprising an evaporative humidifier and cooler apparatus for humidification and cooling of air, which evaporative humidifier and cooler apparatus is cleaned based on the condition of a cooling and humidification media of the apparatus.

In order to achieve the above objects there is proposed a method for cleaning an evaporative humidifier and cooler apparatus according to claim <NUM> and a system comprising an evaporative humidifier and cooler apparatus according to claim <NUM>.

Further, the above objects are achieved by a computer program as defined in claim <NUM> and computer-readable medium as defined in claim <NUM>.

According to an aspect of the invention a method, performed by a control device, for cleaning an evaporative humidifier and cooler apparatus for humidification and cooling of air is provided. The apparatus comprises: a cooling and humidification media, which is configured to receive and evaporate a fluid; a fluid distribution element, which is configured to distribute the fluid to the cooling and humidification media; and a tray arranged to collect fluid downstream of the cooling and humidification media; wherein the fluid distributed by the fluid distribution element is collected from the tray. The method comprises: determining the condition of the cooling and humidification media based on data from a sensor device arranged in fluid communication with the fluid downstream of the cooling and humidification media; and supplying at least one cleaning fluid to the cooling and humidification media dependent on the condition of the cooling and humidification media, wherein the method further comprises:
supplying at least one cleaning fluid to the cooling and humidification media dependent on the condition of the cooling and humidification media, wherein supplying the at least one cleaning fluid to the cooling and humidification media comprises supplying a first cleaning fluid when the cooling and humidification media has a condition requiring de-scaling of the cooling and humidification media and/or supplying a second cleaning fluid when the cooling and humidification media has a condition requiring disinfection of the cooling and humidification media.

The evaporative humidifier and cooler apparatus will be cleaned dependent on the condition of the cooling and humidification media. The sensor device is configured to detect characteristics of the fluid. Based on data achieved from the detection of the characteristics of the fluid, the condition of the cooling and humidification media can be determined. The type of cleaning is performed based on the condition of the cooling and humidification media. Dependent on the condition of the cooling and humidification media, at least one cleaning fluid is supplied to the cooling and humidification media. The data from the sensor device is communicated to the control device. The data is processed in the control device and based on the data from the sensor device a suitable cleaning fluid or a combination of cleaning fluids may be supplied to the cooling and humidification media. The at least one cleaning fluid may be supplied directly to the cooling and humidification media or to the fluid, which is distributed by the fluid distribution element to the cooling and humidification media. When supplying the at least one cleaning fluid to the cooling and humidification media, the evaporative humidifier and cooler apparatus will be cleaned.

The fluid used in the apparatus will contain a certain amount of substances, such as salts and minerals, the concentration of which varies from place to place. During the cooling and humidification process, fluid free from such substances is released to the air. The substances remain in the fluid in the apparatus and are returned to the fluid tray. The method will keep the surface of the cooling and humidification media clean. The result is that the service life of the cooling and humidification media may be significantly extended.

According to an aspect of the invention a system comprising an evaporative humidifier and cooler apparatus for humidification and cooling of air, a control device and a sensor device arranged in communication with the control device is provided. The apparatus comprising: a cooling and humidification media, which is configured to receive and evaporate a fluid; a fluid distribution element, which is configured to distribute the fluid to the cooling and humidification media; and a tray arranged to collect fluid downstream of the cooling and humidification media; wherein the fluid distributed by the fluid distribution element is collected from the tray; and wherein the control device is configured to determine the condition of the cooling and humidification media based on data from the sensor device arranged in fluid communication with the fluid downstream of the cooling and humidification media; and wherein at least one cleaning fluid is supplied to the cooling and humidification media by a fluid pump via the fluid distribution element dependent on the condition of the cooling and humidification media, wherein the control device configured to supply the at least one cleaning fluid to the cooling and humidification media comprises supplying a first cleaning fluid when the cooling and humidification media has a condition requiring de-scaling of the cooling and humidification media; and/or wherein the control device configured to supply the at least one cleaning fluid to the cooling and humidification media comprises supplying a second cleaning fluid when the cooling and humidification media has a condition requiring disinfection of the cooling and humidification media.

The evaporative humidifier and cooler apparatus of the system will be cleaned by the at least one cleaning fluid. The sensor device is arranged in fluid communication with the fluid downstream of the cooling and humidification media. In a circulating process, where the fluid is collected in a tray after the fluid has passed the cooling and humidification media, the fluid is brought back to the cooling and humidification media by for an example a circulating pump. Thus, the sensor device may be arranged in fluid communication with the fluid at any position in a circuit containing the cooling and humidification media, since any position in a circuit will be a position downstream of the cooling and humidification media. Data from the sensor device is communicated to the control device. The data is processed in the control device. Based on the data, the condition of the cooling and humidification media can be determined and thus a suitable cleaning fluid or a combination of cleaning fluids may be supplied to the cooling and humidification media. When supplying the at least one cleaning fluid to the cooling and humidification media, the evaporative humidifier and cooler apparatus will be cleaned.

The apparatus of the system uses the physical principle of fluid evaporation. Air is forced through the cooling and humidification media by a fan. While the air passes through the wet cooling and humidification media, it releases heat to the fluid, thereby cooling itself. The quantity of moisture present in the air determines the level of temperature reduction of the air treated.

Additional objectives, advantages and novel features of the invention will be apparent to one skilled in the art from the following details, and through exercising the invention. While the invention is described below, it should be apparent that modifications can be made by one skilled in the art, without departing from the scope of the appended claims.

For fuller understanding of the present disclosure and further objects and advantages of it, the detailed description set out below should be read together with the accompanying drawings, in which the same reference notations denote similar items in the various figures, and in which:.

According to the present invention, a method, performed by a control device, for cleaning an evaporative humidifier and cooler apparatus for humidification and cooling of air is provided. The apparatus comprises: a cooling and humidification media, which is configured to receive and evaporate a fluid; a fluid distribution element, which is configured to distribute the fluid to the cooling and humidification media; and a tray arranged to collect fluid downstream of the cooling and humidification media; wherein the fluid distributed by the fluid distribution element is collected from the tray. The method comprises: determining the condition of the cooling and humidification media based on data from a sensor device arranged in fluid communication with the fluid downstream of the cooling and humidification media; and supplying at least one cleaning fluid to the cooling and humidification media dependent on the condition of the cooling and humidification media.

Such method is performed by a control device. The control device may be a component of the evaporative humidifier and cooler apparatus or a component independent and arranged at a distance from the evaporative humidifier and cooler apparatus. The evaporative humidifier and cooler apparatus may be configured for humidification of air. Thus, the apparatus may increase the humidity in air or keep the humidity in air at a predetermined level. The apparatus may also decrease the temperature of air or keep the temperature at a constant level. The cooling and humidification media is made of a material which is able to receive and evaporate a fluid. The cooling and humidification media may have a corrugated surface, which increases the surface of the media. The cooling and humidification media may be arranged in cassettes, which are supported by a rigid frame of the apparatus. The fluid, received and evaporated by the media, may be water or any other suitable fluid which may be evaporated by the media. The fluid may preferably be environmentally friendly.

The fluid distribution element is configured to distribute the fluid to the cooling and humidification media. The fluid may flow over and through the cooling and humidification media by means of gravity. A first fluid pump may be connected to the fluid distribution element, wherein the first fluid pump is configured to deliver fluid to the fluid distribution element. The first fluid pump may suck the fluid from the tray and deliver the fluid to the fluid distribution element. The first fluid pump may be driven by and electric motor. The first fluid pump may be driven at different speeds in order to deliver fluid to the fluid distribution element with different flow rates and different volume flows. During start up of the apparatus, an increased flow of fluid may be provided by the first fluid pump to the fluid distribution element, in order to increase the wetting of the cooling and humidification media. When the cooling and humidification media has absorbed the fluid, and is completely wet, the flow of fluid provided by the first fluid pump may be reduced to a normal fluid delivery level. When shutting down the apparatus, the first fluid pump is stopped, so no fluid is delivered to the fluid distribution element. The fluid distribution element may be connected to the frame of the cassette. The fluid distribution element may be an elongated sprinkler, arranged at the top of the media. The fluid distribution element may have small calibrated holes orientated upwards. This design feature prevents the clogging and thus ensures efficient water distribution over the entire cooling and humidification media. Efficient water distribution over the entire cooling and humidification media is also ensured even in cases where the cooling and humidification media are not perfectly horizontally aligned, for example due to ground movements. Alternatively, or in combination with the elongated sprinkler, a single fluid nozzle may be arranged to distribute fluid to the media.

The tray is arranged to collect fluid downstream of the cooling and humidification media. Fluid distributed to the cooling and humidification media will be released to the surrounding air in the space to be treated by the evaporative humidifier and cooler apparatus. However, not all fluid distributed to the media will be released to the surrounding air and therefore fluid may flow by means of gravity along the media and into the tray arranged downstream or below the media. As mentioned above, the first fluid pump may suck the fluid from the tray and deliver the fluid to the fluid distribution element. Since fluid is released to the surrounding air, fluid should continuously be supplied to the tray from a fluid supply tank or from a fluid pipe network. The fluid from the fluid supply tank or from the fluid pipe network may be supplied to the tray by a second fluid pump. A proportion of the fluid in the tray may continually be drained and replaced with fresh fluid from the fluid supply tank to control the concentration of unwanted substances in the fluid.

According to an aspect, determining the condition of the cooling and humidification media comprises determining the pH-value, hardness, turbidity, salt content, and/or presence of bacteria/fungi in the fluid downstream of the cooling and humidification media.

The sensor device is configured to detect characteristics of the fluid connected to the pH-value, hardness, turbidity, salt content, and/or presence of bacteria/fungi in the fluid. Based on these detected characteristics of the fluid, data is achieved from the sensor device for determining the pH-value, hardness, turbidity, salt content, and/or presence of bacteria/fungi in the fluid. Alternatively, the data achieved from the sensor device is processed in the control device in order to determining the pH-value, hardness, turbidity, salt content, and/or presence of bacteria/fungi in the fluid. Based on this information, the condition of the cooling and humidification media may be determined. The sensor device may be arranged in the tray and in contact with the fluid in the tray.

According to an aspect, supplying at least one cleaning fluid to the cooling and humidification media dependent on the condition of the cooling and humidification media comprises determining a dosage of the at least one cleaning fluid based on the condition of the cooling and humidification media.

The sensor is configured to detect characteristics of the fluid connected to the pH-value, hardness, turbidity, salt content, and/or presence of bacteria/fungi in the fluid. The concentration or grade of the pH-value, hardness, turbidity, salt, and/or bacteria/fungi in the fluid may be detected by the sensor device. Based on this information, the condition of the cooling and humidification media may be determined, and thus a dosage of the at least one cleaning fluid may be determined. The dosage of the at least one cleaning fluid may also be dependent on the characteristics of the at least one cleaning fluid. The at least one cleaning fluid may preferably be environmentally friendly.

According to an aspect, supplying at least one cleaning fluid to the cooling and humidification media comprises supplying the at least one cleaning fluid to the tray.

A first fluid pump may be connected to the fluid distribution element, wherein the first fluid pump is configured to deliver fluid to the fluid distribution element. The fluid distribution element is configured to distribute the fluid to the cooling and humidification media. The first fluid pump may suck the fluid from the tray and deliver the fluid to the fluid distribution element. Supplying the at least one cleaning fluid to the tray results in that the cleaning fluid will be mixed with the fluid in the tray. The blended fluid in the tray and the cleaning fluid are supplied to the fluid distribution element, which distributes the blended fluid in the tray and the cleaning fluid the cooling and humidification media for cleaning the cooling and humidification media. The blended fluid in the tray and the cleaning fluid may be supplied to the fluid distribution element by the first fluid pump. The at least one cleaning fluid may be supplied to the tray by a third fluid pump. Alternatively, the tray may be drained before supplying the cleaning fluid to the tray. When the cleaning fluid has been supplied to the tray, the cleaning fluid is supplied to the fluid distribution element, which distributes the cleaning fluid to the cooling and humidification media for cleaning the cooling and humidification media. In this case, only cleaning fluid may be supplied to the fluid distribution element by the first fluid pump.

According to an aspect, supplying the at least one cleaning fluid to the cooling and humidification media comprises supplying the at least one cleaning fluid to the fluid distribution element.

The first fluid pump may be connected to the fluid distribution element, wherein the first fluid pump is configured to deliver fluid to the fluid distribution element. The first fluid pump may suck the fluid from the tray and deliver the fluid to the fluid distribution element. The at least one cleaning fluid may be supplied to the fluid distribution element by a third fluid pump. Before reaching fluid distribution element, the at least one cleaning fluid may pass a regulator valve, which is arranged between the third fluid pump and the fluid distribution element. Also the fluid sucked from the tray by means of the first fluid pump may pass the regulator valve. The at least one cleaning fluid to may be mixed with the fluid in the tray by regulating the regulator valve. The blended fluid in the tray and the cleaning fluid may be supplied to the fluid distribution element by the first fluid pump. Alternatively, the regulator valve may close the connection between the tray and the fluid distribution element, so that only cleaning fluid is supplied to the fluid distribution element, which distributes the cleaning fluid to the cooling and humidification media for cleaning the cooling and humidification media.

According to an aspect, determining the condition of the cooling and humidification media comprises circulating fluid from the tray to a container comprising the sensor device.

The container may be separated from the tray. The fluid in the container may be separated from the fluid in the tray. The fluid from the tray may be circulated to the container by a fourth fluid pump. The sensor device may be arranged in the container and in contact with the fluid circulated from the tray. The fluid in the container may be circulated back to the tray by a fifth fluid pump. Such container with the sensor device may be connectable to a tray of an evaporative humidifier and cooler apparatus in order to determining the condition of the cooling and humidification media.

According to the present invention, supplying the at least one cleaning fluid to the cooling and humidification media comprises supplying a first cleaning fluid when the cooling and humidification media has a condition requiring de-scaling of the cooling and humidification media, and/or supplying the at least one cleaning fluid to the cooling and humidification media comprises supplying a second cleaning fluid when the cooling and humidification media has a condition requiring disinfection of the cooling and humidification media.

Minerals, salt, bacteria and/or fungi in the fluid may result in deposits and sediments on the cooling and humidification media, may result in a need for de-scaling of the cooling and humidification media. By detecting characteristics of the fluid connected to the pH-value, hardness, turbidity, salt content, and/or presence of bacteria/fungi in the fluid, the sensor device alone or the control device may determine if the cooling and humidification media has a condition requiring de-scaling of the cooling and humidification media. The first cleaning fluid has characteristics, which will clean the cooling and humidification media from deposits and thus de-scaling of the cooling and humidification media. De-scaling the cooling and humidification media is a result of cleaning the evaporative humidifier and cooler apparatus. The first cleaning fluid may preferably be environmentally friendly.

Minerals, salt, bacteria and/or fungi in the fluid may result in a need of disinfection of the cooling and humidification media. By detecting characteristics of the fluid connected to the pH-value, hardness, turbidity, salt content, and/or presence of bacteria/fungi in the fluid, the sensor device alone or the control device may determine if the cooling and humidification media has a condition which requires disinfection of the cooling and humidification media. The second cleaning fluid has characteristics, which will clean the cooling and humidification media from minerals, salt, bacteria and/or fungi and thus disinfect the cooling and humidification media. Disinfection of the cooling and humidification media is a result of cleaning the evaporative humidifier and cooler apparatus. The second cleaning fluid may preferably be environmentally friendly.

The present invention also relates to a computer program comprising instructions which, when the program is executed by a computer, causes the computer to carry out the method disclosed above. The invention further relates to a computer-readable medium comprising instructions, which when executed by a computer causes the computer to carry out the method disclosed above. The method may be comprised in pre-programmed software, which may be implemented into the drilling unit suitable for utilizing the method. The pre-programmed software may be stored in the control device. Alternatively, or in combination, the software may be stored in a memory or in computer at a distance from the control device.

According to the present invention, a system comprising an evaporative humidifier and cooler apparatus for humidification and cooling of air, a control device and a sensor device arranged in communication with the control device is provided. The apparatus comprising: a cooling and humidification media, which is configured to receive and evaporate a fluid; a fluid distribution element, which is configured to distribute the fluid to the cooling and humidification media; and a tray arranged to collect fluid downstream of the cooling and humidification media; wherein the fluid distributed by the fluid distribution element is collected from the tray; and wherein the control device is configured to determine the condition of the cooling and humidification media based on data from the sensor device arranged in fluid communication with the fluid downstream of the cooling and humidification media; and supply at least one cleaning fluid to the cooling and humidification media dependent on the condition of the cooling and humidification media.

It will be appreciated that all the examples described for the method aspect of the invention performed by the control device are also applicable to the system aspect of the invention. That is, the control device of the system may be configured to perform any one of the steps of the method according to the various examples described above. Thus, according to the following aspects, the control device of the system may be configured to perform the method steps according to the corresponding examples and aspects described above.

According to an aspect, the control device may thus be configured to determine the condition of the cooling and humidification media by determining the pH-value, hardness, turbidity, salt content, and/or presence of bacteria/fungi in the fluid downstream of the cooling and humidification media. According to a further aspect, the control device may be configured to supply the at least one cleaning fluid to the cooling and humidification media dependent on the condition of the cooling and humidification media by determining a dosage of the at least one cleaning fluid based on the condition of the cooling and humidification media. According to a further aspect, the control device may be configured to supply the at least one cleaning fluid to the cooling and humidification media by supplying the at least one cleaning fluid to the tray. According to a further aspect, the control device may be configured to supply the at least one cleaning fluid to the cooling and humidification media by supplying the at least one cleaning fluid to the fluid distribution element. According to a further aspect, the system may further comprising a container comprising the sensor device, the container being arranged in fluid communication with the tray, wherein the control device is configured to circulate fluid from the tray to the container. According to a further aspect, the control device is configured to supply the at least one cleaning fluid to the cooling and humidification media comprises supplying a first cleaning fluid when the cooling and humidification media has a condition requiring de-scaling of the cooling and humidification media. According to a further aspect, the control device may be configured to supply the at least one cleaning fluid to the cooling and humidification media comprises supplying a second cleaning fluid when the cooling and humidification media has a condition requiring disinfection of the cooling and humidification media.

The fluid pumps described above may be driven by electric motors.

The method, performed by a control device, for cleaning an evaporative humidifier and cooler apparatus, the system comprising an evaporative humidifier and cooler apparatus, the computer program and the computer-readable medium will now be described together with the appended drawings.

<FIG> schematically illustrate a system <NUM> according to a first example. The system comprising an evaporative humidifier and cooler apparatus <NUM> for humidification and cooling of air. A control device <NUM> is provided, which is connected to a sensor device <NUM>. The apparatus <NUM> comprising a cooling and humidification media <NUM>, which is configured to receive and evaporate a fluid <NUM>. A fluid distribution element <NUM> is configured to distribute the fluid <NUM> to the cooling and humidification media <NUM>. A tray <NUM> is arranged to collect fluid <NUM> downstream of the cooling and humidification media <NUM>. The fluid <NUM> distributed by the fluid distribution element <NUM> is collected from the tray <NUM>. A first fluid pump <NUM> is be connected to the fluid distribution element <NUM>, wherein the first fluid pump <NUM> is configured to deliver fluid <NUM> to the fluid distribution element <NUM>. The first fluid pump <NUM> is arranged at a fluid pipe arranged between the tray <NUM> and the fluid distribution element <NUM>. The first fluid pump <NUM> may suck the fluid <NUM> from the tray <NUM> and deliver the fluid <NUM> to the fluid distribution element <NUM>. A fluid supply tank <NUM> is in fluid connection with the tray <NUM> by a fluid pipe. Fluid <NUM> may be supplied to the tray <NUM> from the fluid supply tank <NUM>. The fluid <NUM> from the fluid supply tank <NUM> is supplied to the tray <NUM> by a second fluid pump <NUM>. Vertically directed arrows <NUM> represent the direction of fluid <NUM> through the fluid distribution element <NUM>, the cooling and humidification media <NUM> and further to a fluid tray <NUM>. A drain valve <NUM> is arranged at the tray <NUM> and the fluid <NUM> in the tray <NUM> is may be drained via the drain valve <NUM>. An additional sensor device <NUM> may be connected to the control device <NUM>, which additional sensor device <NUM> is may detect temperature and humidity in the air surrounding the apparatus <NUM>.

The control device <NUM> is configured to determine the condition of the cooling and humidification media <NUM> based on data from the sensor device <NUM> arranged in fluid communication with the fluid <NUM> downstream of the cooling and humidification media <NUM>. The condition of the cooling and humidification media <NUM> may be determined by determining the pH-value, hardness, turbidity, salt content, and/or presence of bacteria/fungi in the fluid <NUM> downstream of the cooling and humidification media <NUM>. Depending on the condition of the media <NUM> a first cleaning fluid <NUM> and/or a second cleaning fluid <NUM> will be supplied to the cooling and humidification media <NUM>.

A container <NUM> is provided, which contains the fluid <NUM> and the first and second cleaning fluids <NUM>, <NUM>. The fluids <NUM>, <NUM>, <NUM> are separated from each other in the container by partition walls <NUM> arranged in the container <NUM>. Three independent containers may also constitute the container <NUM>. According to the first example, the part of the container <NUM> comprising the fluid <NUM> is arranged in fluid communication with the tray <NUM> by means of a pipes comprising a fourth fluid pump <NUM> and a fifth fluid pump <NUM> and a first valve <NUM>. The part of the container <NUM> containing the fluid <NUM> also comprising the sensor device <NUM>. The control device <NUM> is configured to circulate fluid <NUM> from the tray <NUM> to the part of the container <NUM> containing the fluid <NUM>. The parts of the container <NUM> containing the first and second cleaning fluids <NUM>, <NUM> are in fluid connection with the tray <NUM> by pipes comprising a third fluid pump <NUM> and a second valve <NUM> and third valve <NUM>.

The control device <NUM> is configured to supply the first and/or second cleaning fluid <NUM>, <NUM> to the cooling and humidification media <NUM> by supplying the first and/or cleaning fluid <NUM>, <NUM> to the tray <NUM>. The control device <NUM> is configured to supply a first cleaning fluid <NUM> to the cooling and humidification media <NUM> when the cooling and humidification media <NUM> has a condition requiring de-scaling of the cooling and humidification media <NUM>. The control device <NUM> is configured to supply a second cleaning fluid <NUM> to the cooling and humidification media <NUM> when the cooling and humidification media <NUM> has a condition requiring disinfection of the cooling and humidification media <NUM>. In addition, based on the condition of the cooling and humidification media <NUM>, the control device <NUM> is configured to determine a dosage of the first and/or cleaning fluid <NUM>, <NUM>.

A fan <NUM> is configured to generate an air flow through the cooling and humidification media <NUM>. The fan <NUM> may generate a forced air flow through the cooling and humidification media <NUM>. The fan <NUM> may be arranged behind the cooling and humidification media <NUM> and thus force the air flow through the cooling and humidification media <NUM> by a pressure. Alternatively, or in combination, a fan <NUM> may be arranged in front of the cooling and humidification media <NUM> and thus force the air flow through the cooling and humidification media <NUM> by sucking the air flow through the cooling and humidification media <NUM>. The fan <NUM> may generate a regulated forced air flow through the first and second cooling and humidification media <NUM>.

<FIG> schematically illustrate a system <NUM> according to a second example. The system of <FIG> corresponds to the system of <FIG> with the difference that the control device <NUM> is configured to supply the first cleaning fluid <NUM> and/or the second cleaning fluid <NUM> to the cooling and humidification media <NUM> by supplying the first cleaning fluid <NUM> and/or the second cleaning fluid <NUM> to the fluid distribution element <NUM>. The first cleaning fluid <NUM> and/or the second cleaning fluid <NUM> are supplied to the fluid distribution element <NUM> by the third fluid pump <NUM>. A regulator valve <NUM> is arranged between the third fluid pump <NUM> and the fluid distribution element <NUM>. Before reaching the fluid distribution element <NUM>, the first cleaning fluid <NUM> and/or the second cleaning fluid <NUM> will pass the regulator valve <NUM>, which is arranged between the third fluid pump <NUM> and the fluid distribution element <NUM>. Also the fluid <NUM> sucked from the tray <NUM> by means of the first fluid pump <NUM> may pass the regulator valve <NUM>. The first cleaning fluid <NUM> and/or the second cleaning fluid <NUM> may be mixed with the fluid <NUM> in the tray <NUM> by regulating the regulator valve <NUM>. The fluid in the tray <NUM> and the first cleaning fluid <NUM> and/or the second cleaning fluid <NUM> may together be supplied to the fluid distribution element <NUM> by the first fluid pump <NUM>. Alternatively, the regulator valve <NUM> may close the connection between the tray <NUM> and the fluid distribution element, so that only the first cleaning fluid <NUM> and/or the second cleaning fluid <NUM> is supplied to the fluid distribution element <NUM>, which distributes the first cleaning fluid <NUM> and/or the second cleaning fluid <NUM> to the cooling and humidification media <NUM> for cleaning the cooling and humidification media <NUM>.

<FIG> schematically illustrate a system <NUM> according to a third example. The system of <FIG> corresponds to the system of <FIG> with the difference that the sensor device <NUM> is arranged in the tray <NUM>. The sensor device <NUM> is configured to be in contact with fluid <NUM> in the tray <NUM>. The container <NUM> comprises a container for the first cleaning fluid <NUM> and a container for the second cleaning fluid <NUM>. The fluid supply tank <NUM> and the containers <NUM> for the first cleaning fluid <NUM> and a container for the second cleaning fluid <NUM> are in fluid connection with the tray <NUM> by means of fluid pipes. The second fluid pump <NUM> is configured to suck the fluid <NUM> from the fluid supply tank <NUM> and also from the containers <NUM> for the first cleaning fluid <NUM> and the second cleaning fluid <NUM>. A fourth valve <NUM> is arranged between the fluid supply tank <NUM> and the second fluid pump <NUM>.

<FIG> schematically illustrate a system <NUM> according to a fourth example. The system of <FIG> corresponds to the system of <FIG> with the difference that an additional cooling and humidification media <NUM>' and an additional fluid distribution element <NUM>' are arranged on and above the cooling and humidification media <NUM> and the fluid distribution element <NUM> shown in <FIG>. The tray <NUM> is in fluid communication with both the cooling and humidification media <NUM> and the fluid distribution element <NUM>, and the additional cooling and humidification media <NUM>' and an additional fluid distribution element <NUM>' via fluid pipes. A fifth valve <NUM> is arranged between the first fluid pump <NUM> and the fluid distribution element <NUM>. A sixth valve <NUM> is arranged between the first fluid pump <NUM> and the additional fluid distribution element <NUM>'. The fifth and sixth valves <NUM>, <NUM> may be individually controlled or commonly controlled.

The fluid distribution element <NUM> comprises connection means <NUM>, for connecting the fluid distribution element <NUM> to the additional cooling and humidification media <NUM>'. The additional fluid distribution element <NUM>' is configured to transfer the fluid <NUM>, which is distributed by the additional fluid distribution element <NUM>', to the additional cooling and humidification media <NUM>' and further to the cooling and humidification media <NUM>.

<FIG> shows a flowchart of a method according to an example. The method is performed by a control device <NUM>, for cleaning an evaporative humidifier and cooler apparatus <NUM> for humidification and cooling of air. The method thus relates to the system <NUM> comprising the apparatus <NUM> disclosed in <FIG>. The apparatus <NUM> comprises a cooling and humidification media <NUM>, which is configured to receive and evaporate a fluid <NUM>; a fluid distribution element <NUM>, which is configured to distribute the fluid <NUM> to the cooling and humidification media <NUM>; and a tray <NUM> arranged to collect fluid <NUM> downstream of the cooling and humidification media <NUM>; wherein the fluid <NUM> distributed by the fluid distribution element <NUM> is collected from the tray <NUM>.

The method comprising: determining s101 the condition of the cooling and humidification media <NUM> based on data from a sensor device <NUM> arranged in fluid communication with the fluid <NUM> downstream of the cooling and humidification media <NUM>; and supplying s102 at least one cleaning fluid <NUM>; <NUM> to the cooling and humidification media <NUM> dependent on the condition of the cooling and humidification media <NUM>.

Determining s101 the condition of the cooling and humidification media <NUM> comprises determining the pH-value, hardness, turbidity, salt content, and/or presence of bacteria/fungi in the fluid <NUM> downstream of the cooling and humidification media <NUM>. Supplying s102 at least one cleaning fluid <NUM>; <NUM> to the cooling and humidification media <NUM> dependent on the condition of the cooling and humidification media <NUM> comprises determining a dosage of the at least one cleaning fluid <NUM>; <NUM> based on the condition of the cooling and humidification media <NUM>. Supplying s102 at least one cleaning fluid <NUM>; <NUM> to the cooling and humidification media <NUM> comprises supplying the at least one cleaning fluid <NUM>; <NUM> to the tray <NUM>. Supplying s102 the at least one cleaning fluid <NUM>; <NUM> to the cooling and humidification media <NUM> comprises supplying the at least one cleaning fluid <NUM>; <NUM> to the fluid distribution element <NUM>. Determining s101 the condition of the cooling and humidification media <NUM> comprises circulating fluid from the tray <NUM> to a container <NUM> comprising the sensor device <NUM>. Supplying s102 the at least one cleaning fluid <NUM>; <NUM> to the cooling and humidification media <NUM> comprises supplying a first cleaning fluid <NUM> when the cooling and humidification media <NUM> has a condition requiring de-scaling of the cooling and humidification media <NUM>. Supplying s102 the at least one cleaning fluid <NUM>; <NUM> to the cooling and humidification media <NUM> comprises supplying a second cleaning fluid <NUM> when the cooling and humidification media <NUM> has a condition requiring disinfection of the cooling and humidification media <NUM>.

<FIG> schematically illustrates a diagram of a version of a device <NUM>. The control device <NUM> described with reference to <FIG> may in a version comprise the device <NUM>. The device <NUM> comprises a non-volatile memory <NUM>, a data processing unit <NUM> and a read/write memory <NUM>. The non-volatile memory <NUM> has a first memory element <NUM> in which a computer programme, e.g. an operating system, is stored for controlling the function of the device <NUM>. The device <NUM> further comprises a bus controller, a serial communication port, I/O means, an A/D converter, a time and date input and transfer unit, an event counter and an interruption controller (not depicted). The non-volatile memory <NUM> has also a second memory element <NUM>.

There is provided a computer programme P which comprises instructions for carry out the above-mentioned method. The programme P may be stored in an executable form or in a compressed form in a memory <NUM> and/or in a read/write memory <NUM>.

Where the data processing unit <NUM> is described as performing a certain function, it means that the data processing unit <NUM> effects a certain part of the programme stored in the memory <NUM> or a certain part of the programme stored in the read/write memory <NUM>.

The data processing device <NUM> can communicate with a data port <NUM> via a data bus <NUM>. The non-volatile memory <NUM> is intended for communication with the data processing unit <NUM> via a data bus <NUM>. The separate memory <NUM> is intended to communicate with the data processing unit <NUM> via a data bus <NUM>. The read/write memory <NUM> is adapted to communicating with the data processing unit <NUM> via a data bus <NUM>.

When data are received on the data port <NUM>, they are stored temporarily in the second memory element <NUM>. When input data received have been temporarily stored, the data processing unit <NUM> is prepared to effect code execution as described above.

Parts of the methods herein described may be effected by the device <NUM> by means of the data processing unit <NUM> which runs the programme stored in the memory <NUM> or the read/write memory <NUM>. When the device <NUM> runs the programme, methods herein described are executed.

Claim 1:
A method, performed by a control device (<NUM>), for cleaning an evaporative humidifier and cooler apparatus (<NUM>) for humidification and cooling of air, the apparatus (<NUM>) comprises:
a cooling and humidification media (<NUM>), which is configured to receive and evaporate a fluid (<NUM>);
a fluid distribution element (<NUM>), which is configured to distribute the fluid (<NUM>) to the cooling and humidification media (<NUM>); and
a tray (<NUM>) arranged to collect fluid (<NUM>) downstream of the cooling and humidification media (<NUM>);
wherein the fluid (<NUM>) distributed by the fluid distribution element (<NUM>) is collected from the tray (<NUM>);
wherein the method comprises:
determining (s101) the condition of the cooling and humidification media (<NUM>) based on data from a sensor device (<NUM>) arranged in fluid communication with the fluid (<NUM>) downstream of the cooling and humidification media (<NUM>);
characterized in that the method further comprises:
supplying (s102) at least one cleaning fluid (<NUM>; <NUM>) to the cooling and humidification media (<NUM>) dependent on the condition of the cooling and humidification media (<NUM>), wherein supplying (s102) the at least one cleaning fluid (<NUM>; <NUM>) to the cooling and humidification media (<NUM>) comprises supplying a first cleaning fluid (<NUM>) when the cooling and humidification media (<NUM>) has a condition requiring de-scaling of the cooling and humidification media (<NUM>) and/or supplying a second cleaning fluid (<NUM>) when the cooling and humidification media (<NUM>) has a condition requiring disinfection of the cooling and humidification media (<NUM>).