• 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:
    The present invention relates to a method for preventing the emergence of mist on a heat recovery device (7) in a ventilation machine, and a ventilation machine. The method comprises introducing supply air (5) into a heat exchanger (3) into the heat recovery device (7) for heating the supply air (5), and introducing exhaust air (2) into the heat exchanger (3), using the extract air (2) for heating the supply air (5) in the heat exchanger (3). The method further comprises heating the exhaust air (2) with a heating device (10) before the exhaust air is introduced into the heat exchanger to intensify the heating of the supply air (5).
    公开号:FI20175676A1
    申请号:FI20175676
    申请日:2017-07-11
    公开日:2019-01-12
    发明作者:Taneli Timlin
    申请人:Koja Oy；
    IPC主号:
    专利说明:

    METHOD FOR PREVENTING FROSTING AND HEATING SUPPLY FLOW
    20175676 prh 11 -07- 2017
    ENGINEERING
    The invention relates to a method for preventing misting of the heat recovery device of a ventilation machine and for heating the supply air stream.
    TECHNICAL BACKGROUND
    Ventilation machines with a heat recovery device are known, where a heat exchanger 10 is designed to recover heat energy by transferring heat energy from the exhaust air to the supply air. This is typically done by a heat exchanger having one inlet for exhaust air and another inlet for supply air. The heat exchanger is designed so that the heat transfer from the exhaust air to the supply air is as efficient as possible. A problem in such a heat recovery device may be the condensation of moisture in the exhaust air 15 to the surfaces of the heat exchanger, as shown e.g.
    Fogging. Such misting of heat recovery units is a very common problem especially in high temperature heat recovery units. With current methods in use, fogging and defrosting either consume a lot of energy and / or reduce the building conditions.
    Conventional airflow (supply air) vaporization is usually prevented by pre-heating, reducing the supply air flow or lowering the efficiency of the heat recovery unit. All of the above methods can consume a significant amount of energy or degrade the conditions in the building. In particular, reducing the supply airflow can significantly reduce indoor air quality. During the additional heat requirement, the supply air flow of the ventilation unit is conventionally directly heated, for example, by a liquid-circulating heating coil after the heat recovery unit. Because the fresh air outside the heat exchanger can be extremely cold, it is often below 0 ° C during the winter season. In this case, the use of a water-based heating coil to prevent frostbite in a conventional method is generally not possible.
    20175676 prh 11 -07- 2017 list, but must use, for example, a glycol-based fluid or an electric heater. A water coil can be used to heat the supply air stream after the heat recovery unit.
    Figure 1 is a simplified view of a prior art ventilation machine 11. The supply air 4 is supplied to the supply air duct of the heat exchanger 3 of the heat recovery apparatus 7 and the exhaust air is supplied to the exhaust air duct of the heat exchanger 2. In this case, the heat energy is transferred from the warmer air to the colder air, which in practice means that the exhaust air removed from the building during the heating season heats the supply air from the cooler outdoor space. In the heat exchanger, the heated supply air is removed from the 5 heat exchangers and supplied to the interior of the building via a ventilation duct (not shown). Correspondingly, in the heat exchanger, the cooled exhaust air due to the transfer of thermal energy is led to 6 outdoor air.
    BRIEF SUMMARY OF THE INVENTION
    It is an object of the present invention to provide an improved method for preventing fogging of a heat recovery device and heating the supply air stream, and an air-conditioning machine with less fogging and possibly better efficiency of heating the supply air stream. In a method according to a preferred embodiment of the present invention, to prevent misting of the ventilation unit heat recovery unit, the exhaust air flow of the ventilation unit is heated to a higher temperature before being introduced into the heat exchanger.
    The method according to the present invention is mainly characterized in that the method further comprises heating the exhaust air with a heating device prior to introducing the exhaust air into the heat exchanger to enhance the warming of the supply air. The ventilation unit according to the present invention is essentially characterized in that the ventilation unit further comprises means for heating the exhaust air prior to introducing the exhaust air into the heat exchanger to enhance the warming of the supply air.
    Some preferred embodiments of the invention are set forth in the dependent claims.
    The process of the present invention can provide several advantages over known solutions. Fewer frost build-up may occur, reducing the need for defrosting of the heat recovery unit. At least part of the heating energy added to the exhaust air is transferred to the heating of the supply air stream, whereby the average temperature level of the heat recovery device is higher compared to the situation where the exhaust air is not heated. This can reduce the amount of frost accumulation and the total energy consumption may be significantly lower than the conventional solution and possibly exclude the supply air heater. For example, the exhaust air flow heater is a water-based heating coil, which is typically not possible to use for fresh air preheating, as noted above. Also, the method does not weaken the building conditions in any way and, due to lower energy consumption, the overall heat recovery efficiency may be higher.
    LIST OF FIGURES
    The invention will now be described in more detail with reference to the accompanying drawings, in which Fig. 1 is a simplified version of a prior art ventilation machine, Fig. 2 is a simplified version of an ventilation machine according to an embodiment of the invention, and
    20175676 prh 11 -07- 2017
    Figure 3 shows a method according to an embodiment of the invention in a reduced circuit diagram.
    DETAILED DESCRIPTION OF THE INVENTION
    Figure 2 shows a reduced ventilation unit 11 according to a preferred embodiment of the invention and Figure 3 shows a method according to a preferred embodiment of the invention in a reduced circuit diagram. The ventilation machine 11 has mm. the supply air inlet30 channel 8a, the supply air outlet channel 8b, the exhaust air intake channel 9a, the exhaust air outlet channel 9b, and a heat recovery device 7 having e.g. heat exchanger 3. In heat exchanger 3
    20175676 prh 11 -07-2017 is preferably an inlet duct 3a and an exhaust duct 3b which are arranged relative to one another such that heat can be transmitted from one duct to another through the walls of the ducts.
    Supply air, which is normally taken from outside the building and used, for example, as replacement air for the interior of the building, is supplied to the supply air duct 8a of the ventilation unit 11, from which the supply air is further directed to the supply air duct 3a. Exhaust air from the building. the exhaust air is led 2 through the ventilation duct (not shown) inside the building to the exhaust duct 9a of the ventilation machine 11. A heater 10 is provided in connection with the exhaust air intake duct 9a or the exhaust air intake 10 between the duct 9a and the exhaust air duct 3b of the heat exchanger 3 or at a suitable location for the other purpose. In other words, the temperature of the exhaust air supplied to the heat exchanger 3 is increased, which means that more heat energy can be transferred from the exhaust air in the heat exchanger 3 than the supply air is not heated, and additionally the higher temperature exhaust air From the heat exchanger 3, the exhaust air is led to the exhaust duct 9b and further to the outside of the building, preferably to the outdoor air. The heated supply air in the heat exchanger 3 is led from the supply air duct 3a of the heat exchanger 3 through the supply air duct 8b to the ventilation ductwork of the building (not shown) and further to the interior of the building.
    Thus, in the solution of the present invention, the exhaust air flow of the ventilation machine is heated before being fed to the heat exchanger 3, whereby indirectly through the heat recovery device 7, it is sought to warm the supply air flow to the desired temperature (typically about + 20C). At the same time, the average temperature level of the heat recovery device 7 is higher compared to the situation where the exhaust air is not heated. Hereby, the accumulation of mist by the moisture contained in the exhaust air in the heat recovery device 7 can be prevented or at least reduced as the average temperature level of the heat recovery device 7 rises. In some circumstances, the energy added to the exhaust air stream can be almost completely transferred to the heating of the supply air stream, which can consume much less energy than the conventional solution. This, in turn, can improve the efficiency of the ventilation machine according to the invention. It should also be noted that heating the exhaust air does not
    20175676 prh 11 -07- 2017 increases the amount of humidity in it, which reduces the relative humidity of the exhaust air. If the conditions in the heat exchanger 3 are such that the so-called exhaust air is removed. since the dew point temperature is lower than the temperature of the walls of the exhaust air duct 3b of the heat exchanger, no condensation should occur.
    As an exhaust air flow heating device 10, for example, a water-based heating coil can be used, but it is possible to use, for example, an electric heating coil. The water-circulating heater may in some cases be connected to the other heating conduits in the building, without the need for separate equipment to provide water circulation in the heater 10.
    In the solution according to the invention, it is still possible to provide additional heating of the supply air in addition to the heating device 10 described above, by another heating device which can be disposed after the supply air duct 3a of the heat exchanger 3.
    In the ventilation unit according to the invention, if necessary, enhanced air circulation can be arranged, for example, by connecting a fan 12 to the supply air duct and / or the exhaust air duct. However, increasing the exhaust air flow rate may, to some extent, reduce the amount of thermal energy transferred from the exhaust air to the supply air, and there may be a need to adjust the flow rate to obtain an optimal situation. In addition, it is possible in connection with air ducts to use filters 13 for supply and / or exhaust air filtration and / or silencers 14 for suppressing any noise generated in the ventilation unit 11 and any noise emitted through the air ducts.
    It should also be noted that the need for heating the exhaust air can be influenced by e.g. the supply air temperature, whereby it may be advantageous to adjust the heat energy produced by the heating device 10 according to the heating need. During the warm season, heating may not be necessary at all, so that the heating device 10 can be switched off.
    Although apparatus with separate supply air ducts and exhaust air ducts has been used as an example above, it is clear that the present invention can be applied to ventilation machines where the supply air and extract air flows are not sequenced.
    20175676 prh 11 -07- 2017 separate ducts, but their flow through the heat exchanger is arranged in some other way. One example is the so-called. rotary heat recovery unit using a rotor. Here, too, the exhaust air is heated if necessary before being fed to the heat exchanger of the ventilation unit.
    The operation of the ventilation unit and its components can be controlled manually and / or automatically. In this case, the system may include various sensors, some of which may be located in connection with the ventilation unit, for example to measure the supply air temperature and / or the extract air temperature. Inside the building, there may be temperature sensors, sensors for measuring carbon dioxide, etc. The measurement data provided by the sensors can be used, for example, to control the temperature of the heating device 10, to adjust the rotational speed of the fans, etc.
    In a preferred embodiment of the invention, the target indoor temperature of the building is determined, which is thus sought by the supply air 5 and any other indoor heating equipment. In addition, the temperature of the supply air 5 and the temperature of the exhaust air leaving the building are measured before the exhaust air is heated by the heating device 10. Based on the temperature measurements, the temperature difference between the supply air and the exhaust air is determined. This information on the temperature difference as well as the target indoor temperature can then be used to determine the heating need of the extract air 20, so that the temperature control of the heating device 10 can be made based on how much the extract air temperature should be increased. However, it is not always possible or energy-efficient to try to increase the exhaust air temperature by the amount indicated in the calculation, but the additional heating power that may be needed can be taken by other heating devices.
    It will be apparent to one skilled in the art that the present invention is not limited to the examples above, but may be varied within the scope of the appended claims. It is to be understood that the diagrams and devices shown in the drawing are exemplary and do not limit the invention. The invention relates to a method and apparatus which can be implemented in many different ways.
    权利要求:
    Claims (9)
    [1]
    A method of preventing misting of a heat recovery unit (7) of a ventilation machine, comprising:
    5 - the supply air (5) is supplied to a heat exchanger (3) in the heat recovery device (7) for heating the supply air (5),
    - the exhaust air (2) is supplied to the heat exchanger (3), wherein the exhaust air (2) is heated to the supply air (5) in the heat exchanger (3), characterized in that the method further heats the exhaust air (2) (5) to enhance warming.
    [2]
    Method according to Claim 1, characterized in that the heat energy produced by the heating device (10) in the exhaust air (2) is transmitted via a heat exchanger (3).
    15 for supply air (5) heating.
    [3]
    Method according to Claim 1 or 2, characterized in that the heated supply air (5) in the heat recovery device (7) is used as a replacement air for the interior of the building, whereby the heat supply air (5) heated in the heat recovery device (7)
    20 energy is used to heat the building.
    [4]
    A method according to claim 3, characterized in that the exhaust air (3) is taken from inside the building.
    25
    [5]
    Method according to claim 3 or 4, characterized in that the method:
    determining the target indoor temperature of the building, measuring the temperature of the supply air (5), measuring the temperature of the exhaust air to be removed from the building before the exhaust air is heated by the heating device (10),
    30 - determining the temperature difference between the supply air and the extract air, and adjusting the temperature of the heating device (10) based on said target temperature and temperature difference.
    [6]
    6. A ventilation machine comprising:
    35 - a heat recovery device (7) having a heat exchanger (3),
    - means for supplying the supply air (5) to the heat exchanger (3) for heating the supply air (5),
    means for supplying exhaust air (2) to the heat exchanger (3), the supply air (5) being arranged to be heated by the exhaust air (2) in the heat exchanger (3), characterized in that the ventilation machine further comprises means (10) supplying a heat exchanger (3) to enhance the warming of the supply air (5) and to prevent fogging of the ventilation unit.
    [7]
    Ventilation machine according to claim 6, characterized in that the means (10) for heating the exhaust air (2) comprise a water-circulating heating coil.
    10
    [8]
    The ventilation unit according to claim 6 or 7, characterized in that the ventilation unit is arranged to be used as a ventilation unit in a building.
    [9]
    The ventilation unit according to claim 8, characterized in that the ventilation unit comprises means for connecting the ventilation unit to the ventilation ductwork of the building.
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    同族专利:
    公开号 | 公开日
    FI128338B|2020-03-31|
    FI20175676A|2019-01-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
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    FI20175676A|FI128338B|2017-07-11|2017-07-11|Method of preventing frost formation and heating supply air flow|FI20175676A| FI128338B|2017-07-11|2017-07-11|Method of preventing frost formation and heating supply air flow|
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