DE102014107119A1 - Method for ventilating a room and ventilation system therefor - Google Patents

Abstract

By means of the sensors (3, 4) from the relative humidity (LFrel.) And the temperature (T) and possibly the prevailing pressure (p), the absolute humidity of the outside air and the inside air determined and caused by the control only then ventilated when the dew-point temperature TT, in particular the absolute humidity of the outside air, lower, in particular by a predetermined difference (5) is lower than that of the inside air.

Description

I. Field of application

The invention relates to the ventilation of particular cool rooms such as cellars or garages in which precipitates due to excessive humidity condensation on the walls.

At the beginning, the masonry will absorb this moisture, but from a certain saturation of the masonry with absorbed moisture, this will lead to mold on the insides of the walls of the room.

II. Technical background

This has already been tried by conventional ventilation to avoid, so either by the windows of this room were at least slightly open to a high proportion of time or by regular breather, with the aim of the humid air to flow out of the room to the outside and / or to let in dry air from outside.

For this purpose, with manual ventilation, the windows have been opened by feeling, so if you had the feeling that the air outside is drier than inside, which was subjectively often decided on the outside prevailing temperature:
So it was usually aired when the outside temperature was higher than in the room and in winter usually not at all, so as not to cool the room any further.

The disadvantage of this method is, on the one hand, that one had to actively open the windows manually, if one had this impression, and that even then due to the open windows alone, the air flow and exchange from inside to outside was relatively low due to lack of active generation of an air flow and thus also the incoming effect.

In addition, a higher outdoor temperature than the indoor temperature does not always mean that the air outside is drier than inside the room to be ventilated.

The absolute humidity, which expresses the amount of water dissolved in grams in a volume fraction of air, can not be measured directly, or measured only with great effort.

The humid air perceived by humans is the relative humidity, which can amount to a maximum of 100%, which corresponds to a saturation of the air with steam. A maximum saturation of the air with moisture, ie water vapor, thus a relative humidity of 100%, is at any temperature and at an associated air pressure - more precisely: associated partial pressure of the water - or vice versa for a given air pressure - associated partial pressure of the water - at a certain temperature. In a pT diagram, this can be done as a so-called dew point curve according to 2a represent.

As a rule, the air temperature T _Li inside and outside T _{La are known} from the current state.

However, with conventional methods, only the relative humidity FL _rel can be measured directly or by measuring the prevailing pressure and temperature as shown in the diagram in 2a determine.

For this current state (x), the dew point, which is at the same pressure level, can be read on the dew point curve, as well as the dew point temperature T _T.

III. Presentation of the invention

a) Technical task

It is therefore the object of the invention to provide a method for ventilating a room with too humid air for the purpose of reducing the humidity in the room, which can be carried out reliably and with little effort, and to provide a ventilation system for this purpose ,

b) Solution of the task

This object is solved by the features of claims 1 and 14. Advantageous embodiments will be apparent from the dependent claims.

The introduction of outside air into the room, whose internal air is to be reduced in terms of moisture contained, makes sense only if the absolute humidity, ie the amount of water contained in one cubic meter of air, is lower in the outdoor air than in the indoor air.

Only then is the ventilation of the moisture content of the indoor air reduced, which is the primary goal, not least to deliver already stored in the masonry moisture from the wall back to the air of the interior and thereby long-term to dry the masonry again.

To achieve this, the method can be used to permanently or at short intervals by means of appropriate sensors to determine the absolute humidity in the room and outside the room, so the outside air, and automatically by activating the at least one fan outside air in the To transport space only when the absolute humidity of the outside air is lower than that of the indoor air, preferably by a predetermined absolute humidity difference. Because if this difference is too small, the effect of reducing the absolute humidity in the room is so low that the energy required for the fan is not worthwhile.

Since the determination of the absolute humidity from the data usually available, namely air temperature and relative humidity of the air, can not be determined with great effort or without knowledge of the water vapor partial pressure, according to the invention is preferably for the decision whether to be aired should or not, instead of the absolute humidity inside and outside of the room, the dew point temperature inside and outside the room used:
The supply and discharge of outside air, so the ventilation, takes place only when the dew point temperature of the outside air is lower than the dew point temperature of the indoor air.

Preferably, there should be a certain minimum distance between the two dew-point temperatures, namely a freely selectable dew-point temperature difference, because if the two dew-point temperatures are too narrow, the effect of reducing the humidity of the inner air would be so low that the not worthwhile for the fan energy expenditure.

For the determination of the dew point temperature inside and outside the room is technically much easier than the determination of the respective absolute humidities, and in most cases, when the absolute humidity outside is lower than inside the room, the corresponding dew point -Temperature outside lower than inside.

In a few exceptional situations, such as when outside the room there is a very humid, humid air at high temperature, such as just before a thunderstorm, this synchronicity is broken, and then control of aeration could be dependent on the relation of dew point temperatures lead to a faulty control.

However, as these exceptional cases are very rare, the overall result of the ventilation is only slightly reduced and can be accepted because of the advantage of much simpler control.

If you want to prevent in any case, that even in some cases humid outside air, ie with a higher absolute humidity outside of the room, flows into the room, so instead of or in addition the absolute humidity inside and outside the room must be determined and compared with each other and only be ventilated outside the room of lower absolute humidity than in the room.

Normally, in addition to temperature and relative humidity, it is also necessary to determine the current air pressure.

However, since in the generally prevailing temperature range of -20 ° C to + 40 ° C, the actual air pressure on the result of absolute humidity plays only a minor role, according to the present invention, the current air pressure present at the respective altitude of the site Average air pressure replaced and given the control, preferably even independent of the respective sea level for this purpose, the standard air pressure stored in the controller.

Even if controlled according to this parameter, there should be at least an absolute absolute humidity difference between the absolute outside air humidity and the inside air humidity in order to make ventilation more efficient.

When ventilation is in progress, it is ended when the dew point temperature difference and / or the absolute humidity difference falls below the respective predetermined minimum difference.

Preferably, the dew point temperature difference and / or the absolute humidity difference can be selected and set.

In order to avoid overcooling the room below a predetermined minimum temperature, ventilation can only be provided if the air temperature in the room is above this minimum set temperature, and the ventilation stops when the temperature in the room has dropped to this predetermined minimum temperature.

In the same way, a maximum temperature can be selected as the air temperature inside the room.

Ventilation may preferably be at intervals, with preferably the ventilation intervals being no longer than the pause intervals, preferably only 1/5 as long, better still only 1/10 as long, better still only 1/20 as long as the pause intervals.

The temperature sensor and / or the moisture sensor both on the outside and / or on the inside is activated for the measurement at most every 1000 milliseconds. In this case, the distance between the activated phases, that is to say the measurements, and thus also the ratio of durations of deactivity to activity of these sensors, is increased the lower the measured temperature is.

• – bei einem 12 Bit Prozessor: C1 = –2.0468; C2 = 0,0367; C3 = –1,5955 × e^–6
• – bei einem 8 Bit Prozessor: C1 = 2.0468; C2 = 0.5872; C3 =. –4,0845 × e^–4

Preferably, the measured relative air humidity prior to further processing, in particular for calculating the absolute humidity, linearized to LF ' _rel according to the formula _LF'rel = C ₁ + C ₂ × LF _rel + C ₃ × LF _rel ² (% LF _rel ) in which

• For a 12-bit processor: C1 = -2.0468; C2 = 0.0367; C3 = -1.5955 × e ^-6
• For an 8 bit processor: C1 = 2.0468; C2 = 0.5872; C3 =. -4.0845 × e ^-4

• – bei einem 12 Bit-Prozessor T1 = 0,01 und T2 = 0,00008 betragen und
• – bei einem 8 Bit-Prozessor T1 = 0,01 und T2 = 0,00128 betragen.

Preferably, the linearized relative humidity is then converted from 25 ° C in a true relative humidity LF '' _rel when the temperature at the sensor deviates from the formula LF '' _rel = (t _{° C} -25) × (T1 + T2 × LF _rel ) + LF ' _rel , where T1 and T2

• For a 12-bit processor T1 = 0.01 and T2 = 0.00008 and
• For an 8-bit processor, T1 = 0.01 and T2 = 0.00128.

wobei Zustand t_Bereich (°C) α (hPa) β λ (°C) Über Wasser –45–60 6.112 17.62 243.12 Über Eis –80–0.01 6.112 22.46 272.62 The absolute humidity is determined from the relative humidity and the temperature, in particular on the basis of a fixed predetermined, in particular average, air pressure according to the formula

in which Status t _range (° C) α (hPa) β λ (° C) About water -45-60 6112 17.62 243.12 Over ice -80-0.01 6112 22:46 272.62

wobei T-Bereich T_n (°C) m Über Wasser, 0–50°C 243-12 17,62 Über Eis, –40–0°C 274,62 22,46 If the dew point temperatures are used for the control, the respective dew point temperature is determined according to the formula:

in which T area T _n (° C) m Over water, 0-50 ° C 243-12 17.62 Over ice, -40-0 ° C 274.62 22.46

• – mindestens einen motorisch antreibbaren, vorzugsweise elektrisch betreibbaren, Lüfter,
• – einen Innensensor, zumindest für die Temperatur,
• – einen Außensensor, zumindest für die Temperatur, sowie
• – eine Steuerung, die die Messwerte der Sensoren erhält und den wenigstens einen Lüfter ansteuert.

A corresponding ventilation system for ventilating a room according to the invention thus comprises

• At least one motor-driven, preferably electrically operable, fan,
• An internal sensor, at least for the temperature,
• - an outdoor sensor, at least for the temperature, as well
• - A controller that receives the measured values of the sensors and controls the at least one fan.

In order for the sensors and / or the controller to be able to determine at least the dew point temperature inside and outside the room, ie at the inner sensor and the outer sensor, the two sensors can either measure the relative humidity and the temperature or directly measure the absolute humidity, from which the controller, or a processor eg in the respective sensor, the absolute humidity is calculated.

As the air pressure is then a predetermined, for this height, on which the ventilation system operates, mean air pressure, or independently of the sea level known standard air pressure entered into the controller, except indoor sensor and outdoor sensor are also able to measure the current air pressure , Then the latter is used.

The absolute humidity is determined from temperature and relative humidity according to the known contexts, see in particular 3 ,

Calculated by the controller, the absolute humidity from the relative humidity and the temperature is determined, in particular on the basis of a fixed predetermined, in particular average, air pressure according to the formulas given above.

If dew point temperatures are used for the control, the respective dew point temperature is also determined according to the formula explained in the procedure.

The controller preferably has a display which separately displays the dew point temperatures and / or the absolute humidity for the inner sensor and the outer sensor.

In addition, the dew point temperature difference and / or the absolute humidity difference between inside and outside can be displayed.

In addition, the display can in particular also display the current temperature in the room and outside the room, as measured at the respective sensors.

The two sensors and / or the at least one fan are signal-technically connected by cable or wirelessly, in particular by radio.

If the ventilation system comprises a second fan, so that one fan transports outside air into the room and the other fan discharges inside air to the outside, the two fans are preferably located opposite each other in the room, with a maximum possible distance to each other to flow through its entirety as well as possible.

If the system comprises only one fan, in addition - preferably again at a point as far as possible from the one fan of the room - another air opening is necessary, which is only open when it is ventilated. It thus has a closure element, which is only when activating the fan, preferably active, opened, for example in the form of a flap.

The one or the existing two fans also have flaps that close the air passage opening as tight as possible with the fan off, and are open only when the fan is running.

The controller usually contains a relay. Preferably, the controller also includes a test function for this relay to always be able to determine whether the relay is working properly, which is crucial for the overall function of the controller.

The controller may preferably include a program for continuous ventilation in which ventilation is continuous, provided that the prerequisite is met, ie dew point temperature outside <as dew point temperature in the room to be ventilated or / and absolute humidity outside <as absolute humidity in the ventilated Room.

The controller may also preferably include a refrigeration program in which the temperature in the room may be lowered by supplying colder outside air. The supply of outside air can be continued as long as either the relative humidity in the room and / or the absolute humidity in the room does not exceed a corresponding predetermined maximum limit, ie maximum predetermined relative humidity or maximum predetermined absolute humidity, if not previously the desired target temperature is reached.

If dew point control is used, outside air supply continues as long as the dew point temperature is lower than the inside dew point temperature.

The controller may also include a heating program in which the temperature in the room can be increased by supplying warmer outside air. The supply of outside air can be continued until the relative humidity in the room does not rise above a predetermined maximum relative humidity in the room and / or the absolute humidity in the room does not rise above a predetermined maximum absolute humidity in the room and / or the dew point. Temperature in the room does not fall below the dew-point temperature outside the room unless the desired target temperature has already been reached.

Preferably, the moisture sensor is a capacitive sensor, as they measure very accurately and are durable.

For the same reason, the temperature sensor is preferably a bend-gap sensor.

The ventilation system is preferably constructed so that no significant temperature line from the controller, in particular from its processor, to the sensor, in particular the humidity sensor takes place.

c) embodiments

Embodiments according to the invention are described in more detail below by way of example. Show it:

1 : a ventilation situation,

2a , b: the dew point as a function of the water vapor partial pressure and the air temperature,

3 : the dew point temperature depending on the air temperature and the relative humidity

1 shows the typical application where the ventilation system is installed in a room 50 , whose interior air 52 too humid, for example in a garage or a cellar room:
At points as far apart as possible, the air entry point - in this case, left, the air inlet opening 9 - And the air outlet point - in this case right the air outlet opening 11 - is in each case a motor-driven fan 1 assembled. The fan 1 on the left side in the air inlet opening 9 has such a sense of rotation that it is outside air 51 in the room 50 transported.

The fan shown on the right 1 in the air outlet 11 has in the activated state such a sense that he indoor air 52 outside the room 50 removed.

When deactivated, the fans close 1 or in particular fasteners attached thereto 12 the respective opening 9 . 11 as close as possible. Is only in one of the openings 9 . 11 a fan 1 present, the other opening must at least such flaps 12 exhibit that with inactive fan 1 Close the corresponding opening as tightly as possible.

Outside the room 50 , as close as possible to the air inlet opening 9 , is an outdoor sensor 4 arranged, and inside the room 50 an interior sensor 3 both of which measure the prevailing temperature of the air as well as the relative humidity in their respective positions.

They give their measurements to a controller 2 further, preferably weather-protected, in the interior of the room, for example 50 , is arranged, and the signal also with the two fans 1 and / or the flaps 12 the openings 9 . 11 is connected and this controls, so the fan 1 on or off and possibly regulated in its speed as well as the flaps 12 opens or closes.

Aeration is only made and the at least one corresponding fan 1 set in rotation if the prerequisites described above exist.

2a shows the relationship between the air temperature, the water vapor partial pressure, the relative humidity LF _rel. and the dew point temperature T _T in the form of the so-called dew point curve.

It can be seen that the dew point, ie 100% relative humidity, plotted against the air temperature, forms an exponentially rising curve and the dew point is present at a different water vapor partial pressure at each temperature.

The air pressure is composed of the partial pressures of the constituents contained in the air, in the case of air laden with water vapor thus the partial pressure of the water vapor, the partial pressure of the oxygen, the partial pressure of the nitrogen and the partial pressure of the other components contained in the air.

If, in a current situation, for example in the form of moist air, their temperature T _L and their relative humidity LF _rel. You can enter this current situation in this diagram in the form of a vertical line at the present temperature:
Their length from the horizontal abscissa to the dew point curve means 100% rel. Humidity and on this route can from below the current situation x corresponding to the percentage of relative humidity LF _rel. be plotted in the form of this percentage on the mentioned distance from below, eg 42%.

On the horizontal one can read from this current situation x that the actual water vapor partial pressure is 20 kPa. Where this horizontal intersects the dew point curve, exactly below can be read the dew point temperature T _T for the current situation x.

If, in the current situation, one were to lower the air temperature to the dew-point temperature T _T , the moisture contained in the air would condense as of this temperature and precipitate out as water.

This graph also shows that when the temperature changes, but the amount of dissolved water per unit volume of air remains constant, the relative humidity LF _rel. changes, and thus from this graph, the relationship between absolute and relative humidity can not be determined.

In 3 on the other hand, the dew point temperature T _{T is} plotted and read in a simple form above the air temperature T _L , specifically for different relative air humidities LF _rel .

For the state inside (I) of a room, the temperature inside as well as the dew point temperature inside T _{Ti is} directly readable.

The situation A1.1 is recorded as a typical external summer situation, with a temperature significantly higher than that of the interior and a lower relative humidity.

Immediately readable here is that then the dew-point temperature outside T _{TA is} lower than the dew-point temperature inside T _TI , and can be ventilated.

The same applies to the illustrated typical winter situation at A1.3, where the outside temperature is significantly lower than the temperature in the interior, but also at a lower relative humidity than in the interior. Again, the conditions for ventilation are given.

At the same time, an exceptional situation in the form of the summer situation is shown as A1.2, namely humid, humid summer air, ie at the same high temperature as in A1.1, but with significantly higher relative humidity. It is immediately apparent that then the dew-point temperature T _TA outside is higher than the dew-point temperature T _TI inside and should not be aired.

2 B now shows in a detail situation 2a for the relevant temperature range also the situation in the interior (I) as well as the outside situation in two typical summer situations A1.1 and A1.2 and a typical winter situation A1.3.

Since the water vapor partial pressure correlates strongly with the absolute humidity (mass of water per unit volume of air), the vertical coordinate is also to be regarded as absolute humidity.

This also shows immediately that there can be situations like A1.2 where the dew-point temperature T _{TA1.2 is} higher outside than the dew-point temperature inside T _Ti , and yet the absolute humidity outside may be higher than inside and thus ventilation of the room would be counterproductive.

For absolutely safe ventilation, therefore, the absolute humidities inside and outside would have to be compared with each other, but a much higher evaluation and conversion effort is required in the evaluation of the sensor measured values.

However, as the situations of A1.1 and A1.3 show in comparison to I, in most cases a comparison of the dew point temperatures (eg T _Ta1.1 <T _Ti ) is sufficient as a basis for the decision for the ventilation.

LIST OF REFERENCE NUMBERS

1

Fan

2

control

3

internal sensor

4

outdoor sensor

5

temperature difference

6

7

minimum temperature

8th

display

9

Air inlet opening

10

flow direction

11

Air outlet opening

12

flap

50

room

51

outside air

52

indoor air

LF _rel.

relative humidity

LF _abs.

absolute humidity

p

air pressure

_Ti

Dew point temperature inside

T _Ta

Dew point temperature outside

T _Li

Air temperature inside

T _La

Air temperature outside

X

current situation

Claims (32)

Method for ventilating a room ( 50 ) by means of controlled supply of outside air ( 51 ) at a supply point of the room ( 50 ) and discharge of indoor air ( 52 ) at a removal point away from the feed point, characterized in that the supply and discharge takes place only when the dew-point temperature (T _Ta ) of the outside air ( 51 ) by a temperature difference ( 5 ) is less than the dew point temperature (T _Ti ) of the indoor air ( 52 ). Method for cross ventilation of a room ( 50 ) by means of controlled supply of outside air ( 51 ) at a supply point of the room ( 50 ) and discharge of internal air at a removal point away from the feed point, in particular according to claim 1, characterized in that the supply and discharge takes place only when the absolute humidity (LF _abs ) of the outside air ( 51 ) is less than the absolute humidity (LF _abs ) of the indoor air ( 52 ). Method for cross ventilation of a room ( 50 ), in particular according to claim 1, characterized in that the supply and discharge takes place only when the absolute humidity (LF _abs ) of the outside air ( 51 ) by an absolute humidity difference is less than the absolute humidity (LF _abs ) of the indoor air ( 52 ). Method according to one of the preceding claims, characterized in that the dew point temperature difference ( 5 ) and / or the moisture difference is adjustable. Method according to one of the preceding claims, characterized in that the supply and discharge takes place only when the air temperature T _Li in the interior of a room ( 50 ) above a predetermined minimum temperature ( 7 ) lies. Method according to one of the preceding claims, characterized in that when the supply and discharge is in progress, this is terminated when the temperature difference ( 5 ) and / or the absolute humidity difference falls below a predetermined respective minimum difference. Method according to one of the preceding claims, characterized in that the supply and discharge in the presence of the minimum parameters, in particular minimum temperature ( 7 ), yet takes place only at intervals and the ventilation intervals are in particular no longer than the pause intervals, preferably only 1/5, better 1/10, better 1/20 as long as the pause intervals. Method according to one of the preceding claims, characterized in that inner sensor ( 3 ) and outdoor sensor ( 4 ) are able to measure the air pressure. Method according to one of the preceding claims, characterized in that the air pressure in the case of claims 1-7 is assumed as the average air pressure or in the case of an existing air pressure measurement of the actually measured air pressure is used. Method according to one of the preceding claims, characterized in that the measured relative humidity (LF _rel. ) Linearized (LF ' _rel. ) Before the further processing for calculating the absolute humidity according to the formula _LF'rel = C ₁ + C ₂ × LF _rel + C ₃ × LF _rel ² (% LF _rel ) where - for a 12-bit processor: C1 = -2.0468; C2 = 0.0367; C3 = -1.5955 × e ^-6 - for an 8-bit processor: C1 = 2.0468; C2 = 0.5872; C3 =. -4.0845 × e ^-4 is. Method according to one of the preceding claims, characterized in that the linearized relative humidity FL _rel. if the temperature at the sensor deviates from 25 ° C to a true relative humidity LF " _rel. is converted according to the formula LF '' _rel = (t _{° C} -25) × (T1 + T2 × LF _rel ) + LF ' _rel , where T1 and T2 - for a 12-bit processor T1 = 0.01 and T2 = 0.00008 and - for an 8-bit processor T1 = 0.01 and T2 = 0.00128. Method according to one of the preceding claims, characterized in that the absolute humidity (LF _abs. ) Is determined from the relative humidity (LF _rel. ) And that of a sensor ( 3 . 4 ) measured temperature (T _L ) of the air, in particular on the basis of an average air pressure (p), according to the formula

in which Status t _range (° C) α (hPa) β λ (° C) About water -45-60 6112 17.62 243.12 Over ice -80-0.01 6112 22:46 272.62 and / or the dew point temperature is determined

in which T area T _n (° C) m Over water, 0-50 ° C 243-12 17.62 Over ice, -40-0 ° C 274.62 22.46 Method according to one of the preceding claims, characterized in that the temperature sensor and / or the humidity sensor of the outdoor sensor ( 4 ) and / or the inner sensor ( 3 ) is activated at most every 1000 ms, depending on the last measured temperature, and the ratio of duration of deactivity to activity of these sensors ( 3 . 4 ) is increased with decreasing temperature. Ventilation system for ventilating a room ( 50 ) by means of controlled supply of outside air ( 51 ) and discharge of indoor air ( 52 ) with - at least one fan ( 1 ), - an interior sensor ( 3 ), - an outdoor sensor ( 4 ), - a controller ( 2 ), the at least one fan ( 1 ) and the measured values of the sensors ( 3 . 4 ), characterized in that - the internal sensor ( 3 ) and the outdoor sensor ( 4 ) are able either: - to measure the absolute humidity or - to measure the relative humidity (LF _rel. ) and the temperature (T _L ) of the air, - the control ( 2 ) is in particular capable, in the case of the measurement of relative humidity (LF _rel. ) and temperature (T _L ) of the air through the sensors ( 3 . 4 ) from it the absolute humidity (LF _abs ) at the internal sensor ( 3 ) and the outdoor sensor ( 4 ) to investigate. Ventilation system according to claim 14, characterized in that the interior sensor ( 3 ) and outdoor sensor ( 4 ) are able to measure the air pressure (p). Ventilation system according to one of the preceding device claims, characterized in that the air pressure (p) in the case of claims 1-7 is assumed as the average air pressure or in the case of an existing pressure measurement of the actually measured air pressure is used. Ventilation system according to one of the preceding device claims, characterized in that the control ( 2 ) is able to determine the absolute humidity from the relative humidity (LF _rel. ) and that of a sensor ( 3 . 4 ) measured temperature (T _L ) of the air, in particular on the basis of an average air pressure, according to the formula

in which Status t _range (° C) α (hPa) β λ (° C) About water -45-60 6112 17.62 243.12 Over ice -80-0.01 6112 22:46 272.62 Ventilation system according to one of the preceding device claims, characterized in that the control ( 2 ) is able to determine the dew point temperature

in which T area T _n (° C) m Over water, 0-50 ° C 243-12 17.62 Over ice, -40-0 ° C 274.62 22.46 Ventilation system according to one of the preceding device claims, characterized in that the control ( 2 ) a display ( 8th ), which for outdoor and indoor sensor ( 4 . 3 ) separately displays the dew point temperature (T _T ) and / or the absolute air humidity (LF _abs ). Ventilation system according to one of the preceding device claims, characterized in that the control ( 2 ) a display ( 8th ), which for outdoor and indoor sensor ( 4 . 3 ) separately displays the current temperature (T _L ) of the air. Ventilation system according to one of the preceding device claims, characterized in that the two sensors ( 3 . 4 ) and the at least one fan ( 1 ) with the controller ( 2 ) Signaltechnisch wirelessly, in particular by radio, are connected. Ventilation system according to one of the preceding device claims, characterized in that the ventilation system has two fans ( 1 ) at distant points of the room ( 50 ), especially in space ( 50 ) lying opposite one another at points which are at a maximum distance from one another. Ventilation system according to one of the preceding device claims, characterized in that the external or internal sensor ( 4 . 3 ) include a processor, in particular a chip, in particular a CMOS chip. Ventilation system according to one of the preceding device claims, characterized in that the control ( 2 ) contains a test function for the included relay. Ventilation system according to one of the preceding device claims, characterized in that the control ( 2 ) contains a program for continuous ventilation in which ventilation is always provided, provided that the requirement (dew-point temperature outside (T _Ta ) <as dew-point temperature inside (T _Ti ) and possibly additionally outside absolute humidity <as absolute humidity inside) is met , Ventilation system according to one of the preceding device claims, characterized in that the control ( 2 ) contains a cooling program in which the temperature in the room ( 50 ) can be lowered by supplying colder outside air, provided that a relative and / or absolute humidity in the room does not exceed a predetermined max. relative and / or absolute indoor air humidity exceeds. Ventilation system according to one of the preceding device claims, characterized in that the control ( 2 ) contains a heating program in which the temperature in the room ( 50 ) can be increased by supplying warmer outside air, provided that a relative and / or absolute humidity in the room does not exceed a predetermined max. relative and or absolute humidity in the room ( 50 ) increases Ventilation system according to one of the preceding device claims, characterized in that the humidity sensor is a capacitive sensor. Ventilation system according to one of the preceding device claims, characterized in that the temperature sensor is a Bend-gap sensor. Ventilation system according to one of the preceding device claims, characterized in that the ventilation system is constructed so that no significant temperature line from the controller ( 2 ), in particular the processor thereof, to the humidity sensor. Ventilation system according to one of the preceding device claims, characterized in that the controller is able to linearize the measured relative humidity (LF _rel. ) To (LF ' _rel. ) Before further processing for calculating the absolute humidity according to the formula _LF'rel = C ₁ + C ₂ × LF _rel + C ₃ × LF _rel ² (% LF _rel ) where - for a 12-bit processor: C1 = -2.0468; C2 = 0.0367; C3 = -1.5955 × e ^-6 For an 8 bit processor: C1 = 2.0468; C2 = 0.5872; C3 =. -4.0845 × e ^-4 Ventilation system according to one of the preceding device claims, characterized in that the controller is capable of linearized relative humidity FL _rel. if the temperature at the sensor deviates from 25 ° C to a true relative humidity LF " _rel. to convert according to the formula LF '' _rel = (t _{° C} -25) × (T1 + T2 × LF _rel ) + LF ' _rel , where T1 and T2 - for a 12-bit processor T1 = 0.01 and T2 = 0.00008 and - for an 8-bit processor T1 = 0.01 and T2 = 0.00128.

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