FI129735B - Arrangement and method for carrying out ventilation - Google Patents

Abstract

An arrangement for carrying out the ventilation of a property (200) comprising several separate rooms (202-206), comprising one or more ventilation channels (230) for leading the incoming air to the separate rooms or for leading the exhaust air away from the separate rooms. The ventilation duct (230) is arranged as an at least substantially continuous loop.

Description

ARRANGEMENT AND METHOD FOR IMPLEMENTING AIR EXCHANGE

FIELD The present invention relates to an arrangement and method for implementing ventilation in buildings.

BACKGROUND In buildings such as offices, schools, kindergartens and residential buildings, savings are often sought by closing, or at least significantly reducing ventilation at night and when the space is not in use.

However, reducing the ventilation in large spaces causes problems, because due to pressure losses, the ventilation of spaces located far from the ventilation machine may be reduced to a fraction of the original or planned ventilation, changing the building's pressure conditions, which in turn may contribute to the occurrence of moisture damage and other indoor air problems, for example.

When operating at low power, or even when it is stopped, the ventilation naturally does not remove the air pollutants that are present in the building or small particle emissions from structures or the like, which is what the ventilation system was designed and built for in the building.

The purpose of the invention is to present an improved solution to the problems mentioned above.

BRIEF EXPLANATION The aim of the invention is to present an improved ventilation arrangement and method. The goal is achieved with an invention that is the subject of independent patent claims. Advantageous embodiments are described in non-independent patent claims. O In the invention, the ventilation duct is arranged as an essentially uniform ~ loop. This achieves the advantage that the air can be moved evenly throughout the ventilation duct x and thereby to the building where the ventilation duct S is installed. In the ventilation duct installed in the shape of a loop, essentially the same pressure prevails everywhere, ensuring an even distribution of air to the desired = area in the building. > The invention achieves the advantage that ventilation can be carried out with normal or larger air volumes than usual, the energy consumption remains

however, significantly smaller. In this case, the ventilation does not need to be reduced or completely closed for reasons of energy saving. Planning and implementing the ventilation arrangement according to the invention is also simpler and more reliable than before.

Adequate ventilation is normally understood as ventilation, where the amount of ventilation is adjusted between 0-100%, where 100% refers to the planned ventilation of the space, i.e. replacing indoor air with outdoor air. The need for ventilation can be determined from the number of people in the space, the carbon dioxide concentration of the space, the temperature or other measurable quantity, so if one of these values is exceeded, the value according to the ventilation plan can also be exceeded.

According to the invention, the ventilation is made to work at 100% and even more power by filtering the air in an energy-efficient way. In addition, the air exchange is organized as a rule in a closed cycle in a loop/ring, so the definition of suitability is not formed based on the mutual exchange rate of indoor and outdoor air, but by means of the constancy of the amount of air in the building. According to the invention, the intake of heated outdoor air, i.e. fresh air, is reduced or even completely eliminated and the amount of ventilation remains so high that the equipment works in a balanced manner throughout the building. A significant advantage is that when the amount of fresh air taken in is smaller, energy is saved considerably. At the same time, the need for ventilation is implemented by cleaning the air with filters that can clean the indoor air even cleaner than fresh air. As the pressure loss of the filters is very small, the pressure level of the fans and the electricity consumption do not increase, but even decrease compared to what is known, so the energy efficiency improves when the air volumes remain large or in accordance with the plans.

» By designing and implementing a ventilation system according to the object of the invention, the entire building can be covered by functional ventilation in all operating situations and at all times. Moisture and indoor air problems caused by solutions in accordance with known technology and usage patterns can be avoided in the building. E In a situation where the on-demand ventilation co according to the invention works, fresh air is not constantly needed in the building thanks to the air cleaning function =. In this case, the moisture released from the moisture sources in the building remains 2 and circulates through the ductwork into the building. The described filtration method does not in itself remove moisture from the air circulating in the ductwork and the building, but the moisture can be removed by momentarily adding fresh air or using a dehumidifier connected to the filters. Moisture removal can be controlled with the help of moisture detectors in the building and ductwork. Dehumidification can also be carried out with heat pump methods, so that energy efficiency remains high and good. When removing moisture, energy is also transferred and lost, so the removal of moisture should be optimized to a suitable level.

The advantages of the invention are also emphasized in situations where the fresh air is not cleaner than the indoor air. The fresh air coming from outside therefore brings impurities into the indoor air, which is also a common problem in ventilation systems internationally. It is clear that the use of the invention is particularly advantageous in large cities, where the outdoor air is dirty, containing various small particles and other pollutants, and is even safe to breathe.

The whole can be controlled by continuous measurement of the conditions of the described system. The measurement can be based on analyzing artificial intelligence (AiT), which learns about the building's operation with the help of installed logic. Continuous measurement produces data that is analyzed for changes. The changes trigger functions that remove impurities and/or moisture from the system. A learning system means that the measured quantities produce data for the artificial intelligence, from which the air exchange of the object in question can be learned and predicted. Changes are calculated from the data, with the help of which the operating values of the ventilation can be reduced or increased as necessary to realize a longer and more affordable life cycle of the building.

DRAWINGS The invention and its preferred embodiments are shown in the following figures, in which figure 1 illustrates a ventilation system according to known technology; = Figure 2 illustrates an air exchange arrangement according to one embodiment of the invention; and 2, figure 3 illustrates the air exchange machine according to one embodiment of the invention as a diagram.

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DETAILED EXPLANATION Figure 1 illustrates known ventilation solutions for building > 100 ventilation. Several rooms and/or S separate rooms 102-110 are arranged in the building, each of which is led by ventilation ducts 130A, 130B, 132A and 132B. Ventilation ducts 130A and 132A are intake air ducts for conducting intake air to the respective separate rooms. Correspondingly, suction exchange ducts 130B and 132B are exhaust air ducts for conducting exhaust air away from separate rooms.

In the ventilation ducts, air intake air valves shown in circles and exhaust air valves shown in X are placed near the separate spaces.

Spaces 108-110 are located relatively close to the ventilation machine 120, while spaces 102-106 are located far from the ventilation machine. The distances can be, for example, such that rooms 108-110 are within twenty meters of the ventilation machine, but the distance between rooms 102-106 can be, for example, 100-150 meters.

Next to the intake air ducts, the air blowing strength (l/s) to different points is shown in relation to the normal value for daily use, which is scaled to 100 in this example.

The situation in Figure 1 shows an exemplary night-time situation, in which case the blowing strength of the ventilation machine would be set to 50% of the normal value, i.e. 50. As you can see, in the nearby rooms 108-110, the blowing strength is still fairly close to the set value of 50, but in the far rooms, the blowing strength has dropped quite significantly to the level of 10-20 due to the supply air valves (not shown in the figure) due to the pressure loss in the ventilation machine, its devices in the ventilation system , in the ventilation ductwork and in the terminals. The total pressure loss depends on the air volume, as the size of the ductwork does not naturally change during the adjustment procedures. For example, when the amount of air is 100% of the set value, the pressure drop can be 300 Pa, and when the amount of air is 50% of the set value, the pressure drop can be 100 Pa. The pressure loss is not linear and because of this the amount of air at the end of the ductwork is significantly lower than what a linear pressure loss would correspond to.

= In addition, it is known that there is always a fixed relationship between the intake and exhaust ducts, so that the exhaust air volume is usually greater in buildings than the intake air volume. The purpose of this precise planning and dimensioning phase is to create a slight negative pressure in the building, the task of which is to cause air flows in the structures of building E from the outside to the inside. The mentioned direction is better in terms of humidity when the outside air is usually drier, or this direction of flow in structures ensures that the dew point does not remain in the middle of the structures, in which case moisture would form in the structures, causing various problems for the indoor air and structures. N Figure 1 illustrates the problem in terms of the intake air duct, but a similar situation can also exist in the exhaust air duct. If the suction power of the ventilation machine is set to the night value of 50, the real suction power in distant rooms 102, 104 may be very low, for example in the order of 10-20.

Figure 2 shows a solution according to one embodiment of the invention. The figure shows a building/property 200 with several separate spaces 202-206 located at different distances from the ventilation machine 220. In this context, separate spaces can refer to rooms, corridors, washrooms or similar closed or closable spaces, or in the simplest terms to different locations in the property. Inevitably, separate spaces are therefore not separated from each other or corridor spaces, for example, by partitions, but only refer to certain areas in the property.

The figure also shows the ventilation duct 230, which in this case is an intake air duct, but the building may have a corresponding parallel exhaust air duct. Supply air valves shown in a circle are placed in the supply air duct in connection with the separate spaces, of which valves 234A and 234B are numbered as an example.

Furthermore, as can be seen in figure 2, the circulating supply air duct of the property is arranged as at least an essentially uniform loop. In one embodiment, this means that the ventilation duct does not have actual ends, such as the beginning and end, but that the duct forms a complete loop. It can also be defined that the air cleaning/filtering part of the system determines the beginning and end of the channel, i.e. the channel starting from the filter in the direction of flow can be seen as the beginning of the channel.

In another embodiment, the duct can have two ends, the outlet end of the duct and the return end of the duct, but in this case the ends are connected to each other through an intermediate space that essentially prevents pressure losses. Such a situation can occur, for example, if both ends of the ventilation duct are arranged in the ventilation S machine, but the ends are not physically connected to each other. In this case, the ends of the duct & are in flow connection with each other and they are essentially in the same space in terms of air pressure, i.e. there are not many pressure losses in the ventilation machine.

== Therefore, the loop is preferably constructed in such a way that the ventilation E machine is part of the loop. Alternatively, the loop can be realized in such a way that © the ventilation machine is outside it but connected to the duct = that forms the loop. In this case, the loop does not necessarily pass through the interior space 2 of the ventilation unit, but the fan of the ventilation unit can be connected to the ventilation duct N by means of a separate connection.

In the solutions according to the embodiments, when the ventilation duct is loop-shaped, the air flow direction in the duct can be in either direction and can be changed, as needed.

Although in Figure 2 the duct/duct system is shown as a rectangle, the embodiments are not limited to the shape shown, but the duct system can be implemented in any shape required.

Advantageously, according to the invention, the ductwork can be realized with the same pipe size, i.e. for example, the supply air ductwork 230 shown in Figure 2 can be a ventilation pipe with the same diameter.

The property's ductwork can be realized with the help of one or more sub-ducts. For example, it can be thought that the embodiment shown in Figure 2 would describe one floor of an apartment building and a corresponding duct system is arranged on the second floor of the same building. The whole house may have one ventilation machine, in which case all subducts located on different floors can be connected to each other. In this case, the ductwork can still form a flow-wise uniform loop, even if it has a vertical layout in addition to the horizontal layout. Due to the shape and structure of the ductwork and the building, the ventilation machine system may contain separate units, such as fans and other devices in the ductwork. The task of the air exchange machine or machines is to control the air exchange equipment/system of the entire building.

In the case of several ventilation machines, the control preferably also takes into account the whole of the ventilation machines. The purpose of an individual ventilation machine is to serve its own ductwork and zone, while the control of the system is intended to serve the entire building in such a way that, by the time the system of one ventilation machine is closed, a situation does not arise in the building that could lead to problems with indoor air quality or the building's humidity = control.

Although the solution according to the invention, a loop-shaped ventilation duct, essentially uniform air pressure can be achieved everywhere in the duct, in one embodiment, one or more actuators can also be installed in the ventilation duct, such as a constant flow device to compensate, for example, for what happens in connection with the supply air or exhaust air valves pressure fluctuation. The constant flow device can be installed, for example, in connection with the flow channel 2 leading to a separate room, or it can be, for example, sub-loop specific in a situation where the air exchange loop consists of, for example, sub-loops located in different layers.

For example, in connection with an inlet air valve, the inlet air of the valve can be automatically adjusted to the desired value with a constant flow device. The device is adapted to work in such a way that when the pressure in the channel increases, the device closes, reducing the flow in the channel and keeping the flow constant over the device. As the pressure decreases, the device, on the other hand, is arranged to increase the flow in the channel so that the pressure in the channel remains at the desired constant pressure.

A constant flow device can be based, for example, on two adjustment parts connected via a spring, which can be, for example, plates or similar pieces. In the supply air duct, a route can be arranged to allow air flow to the control part further away from the ventilation unit in the direction of flow, and the closer plate can be uniform. The high pressure prevailing in the duct overcomes the spring force, so the regulating part closer to the air exchange machine in the flow direction presses close to or even sticks to the regulating part farther away, which allows the air flow to pass through, adjusting the air flow through the device to a lower level. In one embodiment, the more distant adjustment means comprises one or more through-flow openings, and in the case of high air pressure prevailing in the duct, the closer adjustment means at least partially covers said one or more through-flow openings of the further adjustment means, limiting the air flow in the air flow channel.

The spring of the constant flow device can include a separate adjustment device, which can be used to adjust the sensitivity and force of the spring. In one embodiment, the adjustment device comprises a nut working with a threaded connection to adjust the spring force and further to adjust the amount of air in the channel as desired.

This control feature of the constant flow device makes it unnecessary to adjust the terminal device of the channel leading to the separate space, such as a valve, i.e. the separate space-specific terminal device can be adjustment-free. In other words, in practice, the separate room is only led to a space-specific branch of the ventilation pipe, in which case the terminal devices of that branch can be designed and commercially made in a completely new way, e.g. as interior elements.

N As an alternative to spring-powered adjustment, the device can be - — equipped with remote control, in which case the spring adjustment is carried out with the help of a spindle motor or similar to control the pressure ratios and flows in the ductwork. The remote-controlled co constant flow device helps in implementing the necessary regulation of the building. The control of the controller can be done, for example, in such a way that a building with several loops can be air-conditioned as a whole with the 50 N% power of the ventilation machine, but is controlled to one loop from the air conditioning required by the loop.

for example 120%, which function can be performed one loop at a time and repeated for example at night.

This is especially so when outdoor air is needed, which needs to be heated.

The above-described increased air flow in the loop, so-called ventilation, can be realized in the solution according to the embodiments without oversized fans.

If, for example, it is desired to temporarily obtain 150% air flow in relation to the normal value for one loop, the increase in air flow can be realized by lowering the air volume of another loop to, for example, 50%, or even by closing the flow in another loop completely.

By using the air filtering/cleaning according to the embodiments, the ventilation described above is an inexpensive and effective way to improve the indoor air in the building.

The constant flow device can still have measuring devices or measuring connections for an external measuring device, for example for detecting the pressure difference in the duct, and means for transferring information to the ventilation control system to improve the building's humidity control and energy efficiency.

The actuator according to the embodiments in connection with the ventilation duct comprises a fastening section for installation inside the ventilation duct, the actuator further comprising a first adjustment means and a second adjustment means for fitting inside the ventilation duct, and means for adjusting the distance between the first and second adjustment means to control the flow intensity in the duct.

In other words, the constant flow device includes a mounting section to be installed inside the ventilation duct so that the constant flow device as a whole is placed inside the duct, inside the duct/pipe or at the junction of two duct sections.

In its simplest form, a mounting section refers to a surface or projection formed on the device to be placed in the corresponding space in the channel.

Both adjustment means of the constant flow device, as well as the device in general, are adapted to be installed as a whole inside the ventilation duct.

If desired, the constant flow device can be installed with the same type of inlet and/or outlet air duct, as the direction of flow determines the installation method.

N With the help of a constant flow device, the desired part of the ductwork remains constant in terms of flow = intensity within certain limits, even if the fan's power and air volume E are increased or decreased.

Furthermore, with a constant flow device or devices ©, certain parts of the duct system can be managed, such as for example the valve of one room or even one or more ventilation duct loops at the same time.

The constant flow device helps in maintaining a constant flow also in the event that, for example, the filters of the ventilation system become blocked, causing a decrease in pressure, in which case the constant flow regulator opens and does not limit the flow. In other words, when the pressure drop of the filter increases, the pressure drop of the constant flow regulator decreases accordingly.

By presenting the embodiment of the invention in Figure 2, the significant advantage is achieved that since the ventilation duct is practically a continuous loop, the same over/under pressure prevails throughout, which is set to 10/100 in the example of the figure. Consequently, the invention achieves the significant advantage that the air blowing power can be set to a very low value, whereby savings are achieved in addition to the consumption of thermal energy in the consumption of electrical energy, but in such a way that all parts of the building receive exchange air in the same proportion. Compared to, for example, known technology, the typical nighttime setting value for the blowing power has been 50% of the daytime value, but with the help of the invention, a blowing power of up to 10% or less can be used in relation to the daytime value.

In Figure 2, the exhaust air ductwork is not shown, but in practice it can be realized as a parallel ductwork in the same way as the shown intake air ductwork. Since the exhaust air duct system is also at least essentially uniform and loop-like, the pressures in the entire exhaust air duct are also easily controlled. In this case, it can be ensured that the output of the exhaust air is slightly higher than the input air output, so that a slight negative pressure prevails throughout the property to prevent moisture damage.

It can be shown that with the loop-like ductwork structure according to the embodiments, the power used for blowing/suction that implements the ventilation can roughly be halved compared to the traditional ductwork structures that end in or start from the rooms as shown in Figure 1, if the same ventilation is required.

Furthermore, because the solution according to the embodiments of the invention eliminates or at least can significantly reduce the intake of fresh air, savings in heating costs are also achieved when there is no need to heat cold fresh air. N It has been shown above that in the case of underutilization of the building, such as = at night, the suction power can be reduced, for example, to a level of 50% or 10% compared to the planned daily value of 100%. However, with the help of the invention, it is possible © to keep the night use level even at the planned value of 100% for the air volume. = In this case, however, the fresh air intake is advantageously closed, whereby the same recycled air is recycled and cleaned in the system, and heating costs can be saved when there is no need to heat cold fresh air. Of course, the fresh air intake can also be partially restricted, or if it is completely closed, it can be switched on at certain intervals, for example for half an hour. During fresh air intake, the amount of air corresponding to the intake is removed via the exhaust air duct.

Applying the calculation example of the energy certificate guide published by the Ministry of the Environment, it can be estimated that the use of lower blowing and suction power, as well as a lower heating need, enable savings of up to 40% in the total energy consumption related to ventilation.

By using a loop-like ventilation duct structure, due to smaller pressure losses, a known smaller pipe size can be used in the ductwork. For example, in residential buildings, the typical pipe size is 200 mm, but in a solution according to an advantageous embodiment, a pipe size between 10-150 mm, even a pipe size between 10-65 mm can be used. Typical pipe sizes in factory buildings are known to vary between 200-1500 mm, but the solution according to the embodiments allows the use of pipe sizes between 65-150 mm. Furthermore, in known solutions, typically the air pressure in the channel is in the order of 0.3 — 0.8 bar, but in solutions according to the embodiments, pressure can be used, for example, between 1 and 10 bar.

Figure 3 shows a simplified ventilation machine 340 of one embodiment. The ventilation machine is connected to an intake air duct, of which 330A depicts the outlet end of the intake air duct and 330B the other end of the same duct. A filter unit 342 is fitted between these, being part of the intake air duct, whereby the intake air duct forms a continuous loop. The filter unit can be implemented, for example, as an electric filter unit.

The device can also comprise a fresh air duct 344 for leading fresh air to the device and further to the intake air duct 330A. Under normal conditions, the fresh air duct does not need to be used, but the air circulates in the supply air duct 330B -> 330A through the filter unit, continuing to the supply air duct in the property. The system also includes an exhaust air duct (not shown), through which an amount of air corresponding to the fresh air taken in through the fresh air duct can be removed.

N The ventilation machine also includes a control unit 350 for controlling the ventilation of the device/devices/ventilation machines. The control unit includes E fan 346 control means 352 in the ventilation duct to circulate the event air. The adjustment means 352 can also be used to adjust the fresh air intake power through the fresh air channel 344 = if necessary. Furthermore, the control unit can include means for measuring air humidity or pressure or other concentration N 354. The measurement of the condition can take place either in the ventilation machine or, alternatively, the measurement result can be received from the sensors in the ducts. In order to receive or send information, the air conditioner can have communication means 356, which can be implemented wired or wirelessly. In one embodiment, communication devices can also be used to adjust constant flow devices placed in the ductwork to ensure a constant flow in the ductwork.

The subject of the invention is also a method for installing a ventilation system. The ventilation system comprises pipes of the same diameter throughout. During the installation phase, the ventilation duct, such as the supply air duct, is installed as a loop, whereby the outlet end and inlet end of the duct are in flow connection with each other. The outlet and inlet end of the duct can be defined in relation to the air filter installed in the duct.

Preferably, one or more constant flow devices are installed in the duct, which adjust automatically according to the prevailing pressure in the duct or can be adjusted so that the pressure conditions in the duct are essentially constant.

Constant flow devices can be installed in the ductwork in the correct places at the factory or manufacturer or at the contractor's place of work, in which case the invention enables the ventilation system to be delivered to the construction site already adjusted. The difference to known installation methods and systems is that in them the installation work takes place on the construction site, after which all parts are measured and adjusted as a separate job to work correctly. The installation method according to the invention considerably reduces the amount of work and speeds up the construction time compared to known solutions.

Advantageously, in the arrangement according to the invention, a very small number of different parts are used in the construction of the ventilation duct. The fact that the entire channel uses a uniform pipe size is a significant improvement over known solutions using several pipe sizes S Kona, where the upstream end of the channel typically uses a larger & pipe size, decreasing steadily towards the downstream end of the channel. The similarity of the parts increases serial production and makes the parts used even more affordable = to manufacture and easier to install. With the help of the invention, it is possible to considerably reduce the possibility of errors in installations and to a significant extent free yourself from the need to adjust the pressures of the ductwork afterwards.

= Furthermore, in general, the guideline for planning and implementing ventilation systems has been that pressure sensors in the ductwork are used for fan control. For the optimal placement of the sensor, you can use either the center of the static pressure of the duct system or a part of the branch duct where the lowest static pressure prevails, which placement point is usually at the end of the duct at the last outlet. Even this well-known work step can be avoided with the help of the invention.

The solution presented in the embodiments for implementing ventilation is simple from the point of view of the design of the ventilation system. When the structure of the ventilation duct is at least essentially a uniform loop, in which at least essentially the same pressure prevails everywhere, the ventilation duct can be designed to have a uniform diameter throughout. Consequently, the entire ventilation duct can be designed from a pipe of the same diameter. This is a significant improvement to the known technology, where typically the pipe located near the air exchange machine has a larger diameter than the pipe far from the air exchange machine, because the pipe near the air exchange machine has to be dimensioned according to the maximum amount of air to be distributed. Such a duct, comprising pipes of different diameters, is challenging, even impossible to plan in terms of optimal control of air pressures in accordance with the various needs of the building. Air can be led into the loop from both ends, and because of that, the installation is simple, there are fewer errors and the implementation is more affordable.

It is clear that as technology develops, an inventive idea can be implemented in different ways. The invention and its embodiments are not limited to the embodiments presented above, but may vary within the scope of the protection requirements.

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Claims (13)

PATENT CLAIMS 1. An arrangement for ventilating a building (200) comprising a plurality of separate rooms (202-206), comprising one or more ventilation ducts (230) to supply supply air to the separate rooms or to extract fresh air from the separate rooms, which ventilation duct (230) is arranged in at least one substantially continuous loop, which ventilation machine is arranged in the closed loop, characterized in that the arrangement includes an electric filter (342) for cleaning the air that circulates in the ventilation duct and that the arrangement includes a fresh air connection (344) for receiving fresh air to the ventilation duct (330A) and a fresh air connection for removing (346) fresh air from the ventilation duct when necessary, and that the arrangement includes means for circulating air within the loop-shaped ventilation duct through the filter (342) and limiting the intake of fresh air from the outside while the air is circulated in the ventilation duct. 2. The arrangement according to claim 1, characterized in that the ventilation channel comprises an air flow outlet end (330A) and an air flow return end (330B), whereby the outlet end and the return end are in flow connection with each other. 3. The arrangement according to claim 1 or 2, characterized in that the arrangement comprises a ventilation machine (340) operatively connected to the ventilation duct and that the outlet end (330A) and return end (330B) of the ventilation duct are connected to the ventilation machine so that the outlet end and the return end are in flow communication through the interior of the ventilation machine. N 4. The arrangement according to any preceding claim, characterized in that the length of the cross-sectional diameter of the ventilation duct (230) is coincident with the essential length of the ventilation duct. o - 5. The arrangement according to any preceding claim, characterized in that the arrangement includes a constant flow regulator (236A, 236B) to adjust the supply air and/or extract air flow to stay within a predetermined variation interval where the flow and pressure conditions change in the ventilation duct 2 (230). 6. Arrangement according to claim 5, characterized in that the constant flow device (236A) comprises first and second control means, wherein the first and second control means are arranged to limit the air flow in the ventilation channel (230) as a function of the distance between the control means. 7. Arrangement according to claim 6, characterized in that the constant flow device (236B) includes remote control means for remotely controlling the amount of flow in the ventilation duct. 8. Arrangement according to claim 5, characterized in that the constant flow regulator (236A) comprises first control means and second control means for adjusting the flow in the ventilation channel (230), and means for adjusting the distance between the first and second control means, which means for adjusting the propriety are arranged to function under the influence of the pressure in the ventilation duct. 9. Arrangement according to claim 5, characterized in that the constant flow regulator (236A) is arranged to function so that when the pressure in the channel increases, the regulator closes, which reduces the flow in the channel and pours the flow constantly over the regulator, and when the pressure decreases, the regulator is in in turn arranged to increase the flow so that the channel pressure remains at the desired constant pressure. 10. Arrangement according to any preceding claim, characterized in that the air flow direction in the channel can be changed as needed and can be in both directions. N 11. Arrangement according to any preceding claim, characterized AN in that the arrangement comprises one or more sub-channel systems which are interconnected to form a uniform loop in a flow-like manner, independent of the = horizontal and/or vertical arrangement of the channel systems. z 12. A method of implementing a ventilation system in a building - comprising several spaces, a ventilation duct (230) is constructed in a substantially = continuous loop by using a uniform pipe diameter throughout the ventilation duct, characterized in that the air recirculated in the loop is filtered through an electrofilter (342) and the building's ventilation is controlled so that the intake of fresh air into the ventilation duct (230) is temporarily limited while the air | the ventilation duct of the ventilation system is circulated, where the ventilation machine is part of a closed loop. 13. A method according to claim 12, characterized in that the ventilation duct (230) is provided with one or more constant flow regulators (236A, 236B) to pour the air flow constantly through the entire ventilation duct, which one or more constant flow regulators are pre-installed in the ventilation duct and preset - nan assembly in the building. N N O N O < Q o I Ao a i N ~ o O N