• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:SE1050265A1
    申请号:SE1050265
    申请日:2010-03-23
    公开日:2011-09-24
    发明作者:Rikard Bergsten
    申请人:Rikard Bergsten；
    IPC主号:
    专利说明:

    2 A device has previously been described (WO2009 / 038534A1) with which a crawl space is ventilated with outdoor air only when the steam content inside is higher than outside. A device of this type is of course just as useful in a cold attic space. According to the document, it is proposed that such a device be supplemented with a heating element that is triggered by the risk of mold growth, whereby a wind or a crawl space is protected from the occurrence of mold damage (Bergsten, 2006). The technology has been found to work well, especially the combined solution with both vapor content controlled ventilation and heating in cases where the ventilation is not sufficient to reach a mold-safe climate. In connection with the fact that, as mentioned above, there are also internal sources of moisture such as, for example, leakage of moist air to an attic space from the living area, it has sometimes proved difficult to avoid point damage as a result of locally too high vapor levels. , which, despite the device locally, can nevertheless mean that conditions for, for example, mold growth are met. To eliminate this problem as well, a device has been constructed which in one unit provides the entire hitherto affected solution in a package, which in addition contains a fl genuine for circulation of the air enclosed in the space even when no ventilation takes place with outdoor air. The air mixture thus obtained effectively eliminates the problems just mentioned.
    The control of when ventilation with outdoor air is to take place or not takes place as previously described on the basis of information from humidity sensors, whereby the respective moisture content is measured with a sensor on the inside and a sensor on the outside.
    It is common to often use the term moisture sensors somewhat carelessly. This is admittedly a functionally descriptive word, but does not really say anything about what is actually being measured. However, the temperature T and the relative moisture content Rh are normally measured, which values together give the steam content.
    The relationships are as follows: Rh = Steam content / saturation steam content (which applies in general).
    Since the saturation vapor content is a temperature-dependent quantity, this is available as a table value. Rewriting of the above relationship gives: Steam content = Rh x saturation steam content 3 In other words, moisture sensors can be described as something that measures the temperature and the relative moisture content and something that extracts a signal from these values that corresponds to the steam content.
    A peculiarity of humidity sensors is that they have long-term stable precision but that they tend to operate in accuracy over time. This has meant that previous systems either needed regular calibration or had a worse function than what is possible with correctly calibrated sensors. However, no one has so far succeeded in constructing a ventilation device which is long-term stable and which provides a good function even in cases where the accuracy of the sensors deteriorates over time.
    In connection with the design work to find a solution to avoid point damage, which as described above can occur as a result of locally occurring excessive steam contents, it was surprisingly realized how using the self-acquired knowledge about the physical device, it could be realized also a solution to the problem of how it would be easiest to eliminate the problem of a long-term stable function.
    Thus, it has been a main object in connection with the work of the present invention to find a method and a device by means of which it is ensured that ventilation and moisture measurement is feasible in such a way that the effect of operation on the accuracy of moisture sensors in this context can be eliminated.
    According to the invention, a moisture sensor connected to the control system is arranged in chamber A so that the same sensor can measure the moisture content of air supplied from an opening, either outdoor air or recirculated indoor air, to compare with the control system B3 the moisture content therein, after which the control system arranged to always ensure that the air with the lowest moisture content is supplied to the space.
    By measuring the moisture content from the two openings with one and the same sensor, the drift will eliminate itself in the comparisons in that the measurement error that may exist is the same when measuring these parameters, regardless of whether they occur on outdoor or indoor air.
    If the device according to the invention in connection with the use of only one sensor is additionally equipped with a heating element to give the air in the room an opportunity to absorb 4 more moisture, a consequent problem arises which has to do with the single sensor actually giving the measurement error whose function is eliminated of the device according to the invention. The measuring error that probably eventually arises during the service life of the device affects the relative moisture content trigger point at which the heating element in question is intended to be switched on.
    Since the heating element is controlled against the measured absolute value of the relative humidity, which can consequently have a fault, the trigger point for the connection of the element is thus affected, which risks leading to either unnecessarily high energy consumption or substandard function.
    It is therefore a further object of the present invention to provide a method by which the effect of this measurement error is completely or substantially eliminated.
    This is done according to the invention by measuring the relative moisture content Rh of the air in which the sensor passes before the element is switched on and the value is registered in the control unit, after which the air vapor content is determined by multiplying the measured air in the control unit by the saturation vapor content. the passing air reaches a higher value (eg 50 ° C), a nominal Rh is given by dividing the previously determined steam content in the control unit by the saturation steam content at the said higher temperature value against which the sensor can be calibrated, which reduces the measurement error.
    This iterative approach can, in the event that the measurement error is large, be repeated as many times as necessary to reach a reliable value of the relative moisture content for regulatory purposes. In other words, it can be said that the device according to the invention, with the support of the method according to the same invention, is given an opportunity to continuously calibrate itself.
    The invention in brief The invention will be described in more detail below with reference to exemplary embodiments shown in the accompanying drawings, in which: Fig. 1 shows a first very simplified embodiment of a device according to the invention, in the form of a principle view, Fig. 2 shows a first further developed embodiment of a device according to the invention and the flow principle applied, likewise in the form of a principle view and Fig. 3 shows a second embodiment of a device according to the invention, also here in the form of a principle view.
    Detailed description With reference to Fig. 1, a device according to the invention is shown in its simplest conceivable embodiment. According to this, the device comprises a chamber A with two different openings, a first opening 1 and a second opening 2. The opening 1 is in turn connected via a duct 10 to outdoor air and to a space 3 via a duct 6, which space 3 must be ventilated / conditioned_ The opening 2 is connected to the space 3 on the air side. Thus, either fresh outdoor air or recirculated indoor air from the space 3 can be supplied to the space 3 from the chamber A via its connection 2. Which is the case depends on which (possibly both) of some connections connected at the opening 1, either for outdoor air 10 or for recirculation 6 arranged fan A1 in the first case or B1 in the second case, which is operated at each time. A non-return damper A2, which can also consist of a motor-controlled valve, prevents outflow of air via the duct 10 via each channel via which, as stated above, fresh outdoor air can be supplied. In the mouth of the opening 2 there is a humidity sensor A3, which in turn is connected to a control system B3, arranged to detect by alternating operation of the fan A1 or the fan B1 whether it is the outdoor air or the air in the space which has the highest moisture content. After it has been determined which air is driest, this air is used as ventilation or, where applicable, recirculation air. Sensing of the relationship between the mentioned relative moisture contents takes place at regular intervals, for example once an hour, whereby a change of whether ventilation or recirculation takes place from this time. The same procedure then runs uninterrupted.
    Fig. 2 shows a second further developed embodiment of the device according to the invention.
    The device shown comprises two chambers A and B. The first chamber A is connected partly to indoor air in the space 3 via a connection 4, partly to outdoor air via a connection and partly to the second space B via a connection 6. The second space B is connected to indoor air with connection 7 and to the space Avia connection 6. A fan A1 is located so that it can drive air from outside (connection 5) and in via a damper A2 to 6 the indoor air connection 4. The connection 6 between A and B is located after the damper A2 in A. The non-return damper A2 is designed so that it opens when the fan A1 iA is active and closes when the fan A1 iA is inactive, a fan B1 in B at B's connection 7 to indoor air being active. In order for the non-return damper A1 to always open when desired, the fan B1 should be designed so that it gives an equal or weaker overpressure than the fan A1 _ B1 is placed in B so that it drives air from the indoor air connection to B into A. further developed embodiment of the invention, a heating element B2 is placed in B next to the connection 6 between A and B. The device according to Fig. 2 also comprises a control system B3. A sensor A3 is in this embodiment placed in connection with the connection between A and B.
    As can be seen from Fig. 3, the device according to the invention has in a third further developed embodiment a slightly changed layout. The device here comprises two chambers A and B separated from each other, but the connection between the two chambers has figuratively been rotated 90 ° clockwise while the connection 4 to the space 3, to which air is forced either from outside or as recirculated air from the chamber B, has been moved downwards compared to figure 2. This design can be advantageous for flow reasons because the flows from the two chambers with this layout balance each other better.
    The control system B3 has a location which substantially corresponds to that according to the second embodiment. The sensor A3 is in this embodiment placed in the mouth of the connection 4 to the space 3.
    Sensor A3 is intended for measuring relative humidity and temperature. The control system B3 takes measured values from the sensor A3 and controls the fans A1 and B1 as well as the heating element B2 according to the following.
    The control system B3 periodically makes measurements on outdoor air by activating the fan A1 and switching off the fan B1 and the heating element B2 and, after the time it takes for the sensors to acclimatize, makes one or more consecutive measurements to determine vapor pressure and / or vapor content in the outdoor air. Furthermore, the control system B3 periodically makes measurements on indoor air by switching off the ventilation fan A1 and the heating element B2 (insofar as it has been switched on) and switching on the fl switch B1 and, after the time it takes for the sensor to acclimatize, one or more consecutive measurements to determine vapor pressure and / or vapor content in indoor air. One or both fans A1 or B1 are always in operation.
    The control system (B3) controls, between the measuring periods, the fan A1 so that it blows air from the outside in when the steam pressure or steam content is higher in the indoor air than in the outdoor air, in a further developed design in such a way that the speed is kept at a lower level vapor pressure or vapor content is small and the speed is maintained at a higher or normal operating level when the difference in vapor pressure or vapor content is large, possibly with an offset as the starter fan only if a certain minimum difference in vapor pressure or vapor content is measured.
    The control system B3 controls, between the measuring periods, the fan B1 so that it blows air from inside into space A and via its connection to the indoor air back to the indoor air in the room 3, when the fan A1 is not active or when the heating element B2 is active. as the fan A1 is active). The control system (B3) controls, between the measuring periods and if a heating element is included, the heating element so that it is active through a trigger point when the relative humidity of the indoor air exceeds said trigger point. The trigger point can be a fixed value of relative humidity or depend on the temperature and possibly the time that the indoor air has been more humid than the trigger point value, so that the trigger point follows the risk of microbial growth which in itself is also temperature and time dependent 12.
    Because the difference in steam content, for example, is calculated as a difference between two measured values measured with the same sensor, an error due to poor accuracy will be self-extracting, as long as the sensor has good precision, which moisture sensors usually have.
    This avoids that operation of the sensors affects the drying effect the ventilation control is intended to have.
    The control of the heating element B2 switching on and off takes place against an absolute value of the relative humidity and an operation in the accuracy with regard to a measurement of this thus affects the trigger point which can lead to either unnecessarily high energy consumption or substandard function.
    A calibration method is thus desirable and one is made possible by the heating element B2 being placed in the connection between space A and space B. The control system B3 measures relative humidity and temperature at the same time as the fan A1 and the heating element B2 are switched off and the fan B1 is operated, one or more measured values being taken after the time it takes for the sensor A3 to acclimatize, after which the steam content is determined as the saturation steam content of the measured temperature multiplied by the relative humidity. Then the heating element B2 is activated and after the time it takes for the heating element B2 to heat up and for the sensor A3 to acclimatize so that the air next to it has been raised significantly compared to the temperature in the room 3 (eg 50 ° C higher temp), one or several consecutive measurements of temperature and relative humidity. Then the relative humidity that nominally applies is calculated as the steam content at the first measurement time divided by the saturation steam content at the second time. This nominal value of relative humidity will have an error that is reduced in relation to the difference in the saturation vapor content at the first 8 measurement time and the second. Then, the measured relative humidity is calibrated against the thus obtained nominal relative humidity and the calibration value (the difference between the nominal relative humidity and the measured value of relative humidity) and saved for future adjustments of the measurements. The following example shows such a case in practice: The system measures relative humidity (Rh) with an error of +/- 10% to 90% Rh at the temperature 0 ° C. The vapor content is then the relative humidity value multiplied by the saturation vapor content of the temperature in question, which in the case of 0 ° C is 4.86 g / ms, thus 90% * 4.86 g / mß = 4.374 g / ms (+/- 10%). Then the heating element is activated and the temperature is raised to 50 ° C. The saturation vapor content at 50 ° C is about 83.11 g / m 3. Nominal Rh value, the steam content is divided by the saturation steam content, which becomes 4.374 g / m3 / 83.11 g / ms = 5.26%. If the sensor measured 10% error earlier, the nominal Rh error is thus calculated with 10% * 4.86 / 83.11 = 0.58 percentage points. A calibration against the nominal Rh then reduces the error from 10% to 0.58%. If the measurement error thus measured (the difference between measured Rh and nominal Rh) was very large, the procedure can be repeated after the calibration so that the measurement error can be further reduced.
    Due to the alleged design, a drying effect is obtained in the indoor space because the air is reacted with outdoor air when the ventilation has a drying effect and not otherwise; in this way, the space is dried with outdoor air when the supplied outdoor air contains less moisture than the air that is ventilated out of the space; through the heating element, the air temperature can be raised - and thus the relative humidity lowered - when the relative humidity would otherwise have allowed mold growth; because at least one fan is always active, the air will always be rotated in the indoor space, which reduces the risk that local leakage or local temperature differences will create local elevated humidity values; by using the same sensor (s) to determine vapor pressure or vapor content in indoor air and outdoor air, it is avoided that operation of the sensors gives incorrect measurement values - a sensor that measures errors due to operation will measure equal errors for both outdoor air and indoor air and the difference calculation will to substantially equalize in that the vapor content and vapor pressure around a certain temperature can be approximated by a linear function; by using the heating element to create a nominal relative humidity with a significantly lower error than the measurement error of the relative humidity sensor, the sensor's measurement error can be continuously reduced by calibration against the nominal humidity. The invention can of course be varied in a number of ways where a person skilled in the art will nevertheless benefit from this announcement. For example, the space B can be reduced to only the fan housing B1; the control system B3 can be placed in space A, B or outside both of these spaces.
    Self-calibrating hygrodynamic dehumidifier Suggested design | æ | A3 Outdoor air »__- r M. A2 f Indoor air --- + Bi E33 K Indoor air Self-calibrating hygienic humidifier Alternative design | § Outdoor air --- 1 ~ ÅF! A2 \\ »Innelufx - + A, f 'Bi __, .P33 ¶> ** I: Inneluft 11 References Improved Model to Predict Mold Growth in Building Materials. Viitanen H, Ojanen T, 2007.
    Mold growt prediction by computational simulation. Sedlbauer, K et al 2001. 1) “Värm | andsstudien”, Linda Hägerhed Engman 2006 2) Evaluation of the Småhusskadenämnden's archive regarding creeping grounds, Charlotte Svensson 1999 Moisture on cold winds, E Borglund, CAhrnens, 2007
    权利要求:
    Claims (11)
    [1]
    An air exchange device for a space 3 in a building, which is normally unheated, comprising: at least one chamber (A), which chamber (A) has at least two connections, a first connection (1) connecting the chamber A to either a possibility of forced outdoor air via a damper (A2), or alternatively connects the chamber (A) to the space (3), pre-forced recirculation of the air in the space (3), a second connection (2) which is in free contact with the space (3) , and a control system (B3) characterized in that a humidity sensor (A3) connected to the control system (B3) is arranged in the chamber (A) so that it can measure the moisture content of the air supplied from the connection (1), either outdoor air or recirculated indoor air. , in order to compare with the control system B3 the moisture contents therein, after which the control system in connection with ventilation / re-circulation is arranged to always ensure that the air with the lowest moisture content is supplied to the space by controlled forced supply of either outdoor or indoor air.
    [2]
    Device according to claim 1, characterized in that the chamber A has three connections, one connection (10) for supplying forced outdoor air if necessary, another connection (6) for forcibly recirculating the air in the space (3) via the chamber if necessary. A, and a connection (2) that is in free contact with the space 3.
    [3]
    Device according to Claim 2, characterized in that the connection for forced re-circulation (6) is arranged between the chamber (A) and a further chamber (B).
    [4]
    Device according to Claim 3, characterized in that the means for forcing the air flow consist of fans, partly (A1) at the connection (10) for outdoor air in A, partly B1 at the connection (6, 7) for recirculation in A resp. B.
    [5]
    Device according to Claim 4, characterized in that a heating element (B2) is arranged in the direction of flow after the fan (B1). 13
    [6]
    Device according to Claim 5, characterized in that the fan (B1) and the heating element (B2) are both arranged in the separate chamber B.
    [7]
    Device according to claim 6, characterized in that the heating element B2 is placed immediately next to a connection (6) between the chambers (A) and (B), preferably before this connection in the flow direction.
    [8]
    Device according to claim 7, characterized in that the humidity sensor (A3) is composed of a sensor for Rh and a sensor for temperature.
    [9]
    Device according to Claim 8, characterized in that the moisture sensor (A3) is a meadow content sensor or a vapor pressure sensor.
    [10]
    10.) By means of an air exchange or air circulation device to a space 3 in a building, which is normally unheated, ensure that a heating element (B2), which is included in the device, is activated by means of a control system (B3) included in the device, independently of a time-dependent measurement accuracy deviation in a humidity sensor (A3) included in the device, characterized in that, the relative moisture content (Rh) and the temperature (T) of the air in passing the sensor (A3) are measured by this before the element B2 is switched on and the value is registered in the control unit. B3, the vapor content of the air is determined by multiplying the measured Rh of the air in the control unit by the saturation bed content at the current temperature, the heating element B2 is activated until the temperature of this passing air reaches a significantly higher value (eg 50 ° above the air temperature in space 3), a nominal Rh is given by dividing the previously determined steam content in the control unit by the saturation bed content at the current temperature (50 ° C), which reduces the measurement error.
    [11]
    11.) A method according to claim 10, characterized in that it is carried out the required number of times until an error of the nominal value acceptable in view of current requirements is reached.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1050265A|SE535032C2|2010-03-23|2010-03-23|System and method for reducing measurement error of a moisture sensor during air exchange or air circulation of a space|SE1050265A| SE535032C2|2010-03-23|2010-03-23|System and method for reducing measurement error of a moisture sensor during air exchange or air circulation of a space|
    US13/636,685| US20130015253A1|2010-03-23|2011-03-22|Arrangement and a Method for Ventilation of a Space|
    PCT/SE2011/050311| WO2011119092A1|2010-03-23|2011-03-22|A system and a method relating to measuring humidity in a ventilated space|
    EP11759793.0A| EP2550570A4|2010-03-23|2011-03-22|An arrangement and a method for ventilation of a space|
    EP11759794.8A| EP2550508A4|2010-03-23|2011-03-22|A system and a method relating to measuring humidity in a ventilated space|
    PCT/SE2011/050310| WO2011119091A1|2010-03-23|2011-03-22|An arrangement and a method for ventilation of a space|
    US13/636,686| US8978445B2|2010-03-23|2011-03-22|System and a method relating to measuring humidity in a ventilated space|
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