• 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:SE1150709A1
    申请号:SE1150709
    申请日:2011-07-15
    公开日:2013-01-16
    发明作者:Bengt Svensson；Per-Eric Magnusson
    申请人:Iv Produkt Ab；
    IPC主号:
    专利说明:

    The second object of the invention is to provide a method for optimally controlling the defrosting of the air treatment system according to the invention.
    Brief summary of the invention The first object is achieved according to the invention with an air treatment system, which comprises the features of the preamble and is characterized in that the damper device is divided into at least three individually controllable parts, of which a first part is arranged to completely stop an inflow of supply air into in the bypass, to allow a predetermined restricted inflow of supply air into the bypass or to allow an unthrottled inflow of supply air into the bypass, a second part is arranged to completely stop an inflow of supply air into a first half of the heat exchanger supply air part or to allow an unthrottled inflow of supply air into said first half, and a third part is arranged to completely stop an inflow of supply air into a second half of the heat exchanger supply air part or to allow an unstriped inflow of supply air into said second half.
    The advantage of this solution compared to the previously known one is that it enables more and better operating methods adapted to different operating conditions, especially with regard to defrosting but also with regard to energy consumption.
    The various parts of the damper device in the system according to the invention preferably comprise a plurality of rotatable slats, which are arranged to be controlled by means of one actuator per part. The advantage of such slats is that they enable a damper device which has a very low construction height and which is thus easy to install even in tight spaces. In addition, the rotational movement required for their control is easy to achieve even with small actuators.
    In order to further facilitate the installation of the damper device, the rotatable slats of the various parts of the damper device are preferably suspended in a common frame, said actuator suitably also being supported by the common frame.
    The second object of the invention is achieved by means of a method of controlling the defrosting of the air treatment system according to the invention, which system in normal heat exchange operation operates with a certain pressure drop across the heat exchanger exhaust air part and with a completely closed bypass and a completely open supply air part. The method according to the invention is characterized by the steps of measuring the temperature of the supply air into the system outdoors, of measuring the pressure upstream of the heat exchanger part of the heat exchanger, of measuring the pressure downstream of the heat exchanger part of the heat exchanger, of calculating the pressure drop. measured outdoor temperature below the freezing point and an increased pressure drop transition to a fixed defrost cycle, which is divided into four consecutive time periods, namely a first and a fourth time period, during which the inflow of supply air into the bypass is partially restricted, the inflow of supply air into the the first half of the heat exchanger supply air part is completely stopped and the inflow of supply air into the second half of the heat exchanger supply air part is unthrottled, and a second and a third time period, during which the inflow of supply air into the bypass is partially restricted, the inflow of supply air into the first hall - used of the heat exchanger supply air part is unthrottled and the inflow of ti air into the other half of the heat exchanger supply air part is completely stopped.
    The great advantage of the method according to the invention compared with the state of the art is that it takes into account that a limited ice growth has time to occur on an already defrosted half of the heat exchanger supply air part while a second half of it is defrosted. Partial defrosting of the first half of the heat exchanger during a period of the defrost cycle, followed by defrosting of the second half of the heat exchanger during two such periods and termination of defrosting of the first half of the heat exchanger during another such period means that optimal consideration is given to said limited ice growth, wherein the ice growth on the second half of the heat exchanger while the first half is defrosted for the second time is limited by the fact that the second half of the heat exchanger was defrosted immediately before for a longer period of time for two consecutive periods. The time for the entire defrost and thus the time during which the air treatment system works with reduced efficiency can thus be effectively minimized.
    The method according to the invention may further comprise the further step of, when the time between the end of a timed defrost cycle and the beginning of a new timed defrost cycle is shorter than the predetermined time of the defrost cycle, after the new defrost cycle transition to an operating mode with reduced heat exchange , during which the supply of supply air 4 into the bypass is partially restricted and the supply of supply air into both parts of the supply air part of the heat exchanger is unthrottled.
    The advantage of this further step is that the resulting operating mode by bypassing some air past the otherwise open supply air part of the heat exchanger results in less ice build-up on it under difficult operating conditions and also a to a certain extent maintained heat exchange for the air treatment system.
    Brief Description of the Drawings A preferred embodiment of the air treatment system according to the invention and of the manner of controlling it is described in more detail below with reference to the accompanying drawings, in which: Fig. 1 is a perspective view showing the air treatment system with partially broken away parts, and Fig. 2 is a perspective view, which also with partially broken away parts shows only a central part of the air treatment system.
    DESCRIPTION OF THE PREFERRED EMBODIMENT The air treatment system 1 shown in Fig. 1 in its entirety and in Fig. 2 is modularly constructed of sheet metal clad parts and comprises a central module 6, which is surrounded by an inner module 7 (right in Fig. 1) and an outer module. 8 (left in Fig. 1). The central module comprises a heat exchanger 10, which is substantially in the form of a parallelepiped, which in a known manner for so-called plate heat exchangers comprises a large number of parallel plates (not shown in more detail) and rests obliquely on one longitudinal edge. The heat exchanger 10 is intended for transferring heat from hot exhaust air E, which flows into the system 1 via bag filter 9 in an exhaust air duct 2 in the inner module 7 and leaves it via an exhaust air fan 3 in the outer module 8 and in between passes an exhaust air part 11 of the heat exchanger 10 , to cold supply air I, which flows into the system 1 via the corresponding bag filter in a supply air duct 4 in the outer module 8 and leaves it via a supply air fan 5 in the inner module 7 and in between passes a supply air part 12 of the heat exchanger 10. The supply air part 12 is, again in a known manner for plate heat exchangers and therefore not described in more detail, hermetically separated from the above-mentioned exhaust air part 11.
    In addition to through the heat exchanger 10, the supply air I in the air treatment system 1 according to the invention can also flow through a bypass 13. This is arranged next to the heat exchanger 10 in the central module 6 and is connected to the supply air duct 4 upstream of said supply air part 12 and to the supply air fan 5 downstream. and has a size which provides a flow resistance corresponding to the normal flow resistance of the heat exchanger part 12 of the heat exchanger 10. As a result, it can be used in operating conditions when no heat exchange is desired to lead supply air I past the heat exchanger 10 without abnormal pressure drop.
    According to the invention, a damper device 20 is arranged upstream of the supply air part 12 of the heat exchanger 10. This is divided into three individually controllable parts 21-23. The first 21 of these are arranged to completely stop an inflow of supply air I into the bypass 13, to allow a predetermined restricted inflow of supply air I into the bypass 13 or to allow an unthrottled inlet of supply air I into the bypass 13. The second part 22 is arranged to completely stop an inflow of supply air I into a first half 14 of the supply air part 12 of the heat exchanger 10 or to allow an unthrottled inflow of supply air I into said first half 14. The third part 23 is arranged to completely stop an inflow of supply air I into a second half 15 of the heat air supply part 12 of the heat exchanger or to allow an unstriped inflow of supply air I into said second half 15. How these control possibilities are suitably utilized is described in more detail below in connection with the description of the method according to the invention.
    According to the preferred embodiment of the invention, all three parts 21-23 of the damper device 20 comprise a plurality of rotatable slats 24, which are suspended in a common frame 28. The slats 24 can be individually individually adjusted to a completely closed position for each part 21-23. or a fully open position or in other desired positions in between. They are thereby controlled jointly by means of an actuator 25-27 per part 21-23, for example in the form of servomotors, which are also supported by said frame 28. The damper device 20 thus forms a compact unit which can be easily handled and, as shown, is mounted in direct connection with the supply air part 12 of the heat exchanger 10. 6 The air treatment system 1 described above can be controlled very fl visibly thanks to the damper device 20. This is used according to the invention in order to achieve efficient and energy-efficient defrosting in cold weather with a risk of ice formation in the heat exchanger part 11 of the heat exchanger 10 and to delay the ice formation between extreme times when defrosting is required under extreme conditions.
    The method of defrosting includes a number of steps. During normal heat exchange operation for the air treatment system 1, where the supply air part 12 of the heat exchanger 10 is completely open and the bypass 13 is completely closed by means of the damper device and a certain pressure drop is expected over the exhaust air part 11 of the heat exchanger 10, the temperature of the supply air I is measured outdoors. the pressure upstream of the exhaust air part 11 of the heat exchanger 10, and before the exhaust air (6) the pressure downstream of the exhaust air part 11 of the heat exchanger 10 The latter in order to be able to calculate the pressure drop across the exhaust air part 11 of the heat exchanger 10.
    At a measured outdoor temperature below the freezing point and an increased pressure drop, a transition takes place to a time-limited defrosting cycle, which is divided into four consecutive time periods, which preferably have the same duration. During the first and the fourth of these time periods, the inflow of supply air I into the bypass 13 by means of the damper device 20 is partially restricted, the inflow of supply air I into the first half 14 of the heat exchanger part 12 of the heat exchanger 10 is completely stopped and the inflow of supply air I into the second half 15 of the heat exchanger supply air part 12 unthrottled. During the second and third of these time periods, the inflow of supply air I into the model 13 is partially restricted, the inflow of supply air I into the first half 14 of the heat exchanger part 12 of the heat exchanger 10 is unthrottled and the inflow of supply air I into the second half 15 of the heat exchanger 10 of the heat exchanger 10 12 completely stopped.
    The division of the defrost cycle according to the invention takes into account that a limited ice growth has time to occur on an already defrosted half (here the first half 14) of the supply air part 12 of the heat exchanger 10 while a second half (here the second half 15) of it is defrosted. Thereby, the total time for defrosting and thus the time during which the air treatment system 1 operates with reduced efficiency can be effectively shortened.
    Under severe weather conditions with great cold outdoors and relatively high humidity in the exhaust air E, defrost cycles can occur at 7 very frequent intervals. To extend these intervals under such conditions, the method according to the invention may comprise the further step of, when the time between the end of a time-limited defrosting cycle and the beginning of a new time-limited defrost cycle is shorter than the predetermined time of the defrost cycle, after the new defrost cycle an operating mode with reduced heat exchange. During this operating mode, the supply of supply air I into the bypass 13 is partially restricted by means of the damper device 20 and the supply of supply air I into both parts of the supply air part 12 of the heat exchanger 12 is unthrottled. The resulting bypassing of some supply air past the otherwise open supply air part 12 of the heat exchanger 10 results in less cooling of the heat exchanger part 11 of the heat exchanger 1 and thus slower ice build-up thereon, whereby the heat exchange is still maintained to a certain extent.
    It will be appreciated that the air handling system 1 described above and the intended method may be varied in various ways within the scope of the claims.
    It is also understood that the four equally long time periods described above, for example, can also be considered as a first time period, a second twice as long time period and a third time period, which in turn is as long as the first. Finally, it will be appreciated that the four time periods described need not be exactly as long, but that those skilled in the art can, based on the idea behind the invention, in certain cases arrive at other lengths of time. Incidentally, the same person skilled in the art can also easily calculate and thereby determine in advance an appropriate degree of restriction of the supply of supply air I in Appendix 13 in cases where this supply is to be partially restricted.
    权利要求:
    Claims (6)
    [1]
    An air treatment system (1), comprising on the one hand a heat exchanger (10) for transferring heat from hot exhaust air (E), which flows into the system (1) via an exhaust air duct (2) and leaves it via an exhaust air fan (3) and in between, an exhaust air part (11) of the heat exchanger (10) passes, to cold supply air (I), which flows into the system (1) via a supply air duct (4) and leaves it via a supply air fan (5) and in between a supply air part passes (12) of the heat exchanger (10), which supply air part (12) is separated from said exhaust air part (11), and a bypass (13), which is connected to the supply air duct (4) upstream of said supply air part (12) and to the supply air fan (5) downstream thereof and has a flow resistance corresponding to the normal flow resistance of the supply air part (12) of the heat exchanger (10), and on the other hand a damper device (20), which enables opening and closing of the bypass (13) and of said supply air part (12) on the upstream side of the supply air part (12), known that the damper device (20) is divided into at least three individually controllable parts (21-23), of which a first part (21) is arranged to completely stop an inflow of supply air (I) into the bypass (13), to allow a predetermined restricted inflow of supply air (I) into the bypass (13) or to allow an unthrottled inflow of supply air (I) into the bypass (13), a second part (22) is arranged to completely stop an inflow of supply air (I) ) into a first half (14) of the supply air part (12) of the heat exchanger (10) or to allow an unthrottled inflow of supply air (I) into said first half (14), and a third part (23) is arranged to stop completely an inflow of supply air (I) into a second half (15) of the supply air part (12) of the heat exchanger (10) or to allow an unthrottled inflow of supply air (I) into said second half (15).
    [2]
    System (1) according to claim 1, in which the different parts (21-23) of the damper device (20) comprise a plurality of rotatable slats (24), which are arranged to be controlled by means of an actuator (25-27) per part ( 21 -23). 10 15 20 25 30 9
    [3]
    System (1) according to claim 2, in which the rotatable lamellae (24) of the various parts (21-23) of the damper device (20) are suspended in a common frame (28).
    [4]
    A system (1) according to claim 3, wherein said actuator (25-27) is also supported by the common frame (28).
    [5]
    Method for controlling the defrosting of an air treatment system (1) according to one of the preceding claims, which system (1) during normal heat exchange operation operates with a certain pressure drop across the exhaust air part (11) of the heat exchanger (10) and with a completely closed bypass (13) and a fully open supply air part (12), characterized by the steps to measure the temperature of the supply air (I) outdoors in the system (1), to measure the pressure upstream of the heat exchanger (10) of the heat exchanger (10), to measure the pressure downstream of the heat exchanger (10) exhaust air part (11), to calculate the pressure drop across the heat exchanger part (11) of the heat exchanger (10), to switch to a time-limited defrost cycle, which is divided into four consecutive temperatures at a measured temperature outdoors below freezing point and an increased pressure drop. the following time periods, namely a first and a fourth time period, during which the inflow of supply air (I) into the bypass (13) is partially restricted, the inflow of supply air (I) into the first half (14) of heat exchangers ns (10) supply air part (12) is completely stopped and the inflow of supply air (I) into the second half (15) of the heat exchanger part (12) of the heat exchanger (10) is unthrottled, and a second and a third time period, during which the inflow of supply air (1) into the bypass (13) is partially restricted, the inflow of supply air (I) into the first half (14) of the supply air part (12) of the heat exchanger (10) is unthrottled and the inflow of supply air (I) into the the other half (15) of the supply air part (12) of the heat exchanger (10) is completely stopped.
    [6]
    A method according to claim 5, comprising the further step of, when the time between the end of a timed defrost cycle and the start of a new timed defrost cycle is shorter than the predetermined time of the defrost cycle, after the new defrost cycle switch to an operating mode with reduced heat exchange , during which the supply of supply air (I) into the bypass (13) is partially restricted and the supply of supply air (I) into both parts of the supply air part (12) of the heat exchanger (12) is unthrottled.
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE3030778A1|1980-08-14|1982-02-18|Weiss Technik GmbH Umwelt-Klima-Messtechnik, 6301 Reiskirchen|Stale air heat recovery heat exchanger - has stale and external air by=pass valves, operated separately|
    SE463944B|1990-02-23|1991-02-11|Stratos Ventilation Prod Ab|Register arrangement for plate heat exchanger with a shunt duct|
    NO310321B1|1999-09-20|2001-06-18|Villavent As|A method for defrosting a counter-current type heat exchanger and assembly comprising a heat exchanger in the form of such a counter-current heat exchanger|
    DE202005013250U1|2005-08-23|2006-01-05|Koch, Bruno|Air conditioning system for residential use has a heat recovery system with two cross-flow heat exchangers and a contra-flow heat exchanger|
    DE102008038938B4|2008-08-13|2010-07-22|Al-Ko Kober Ag|Heat recovery module of a central ventilation unit of a building ventilation system|GB2513095B|2013-02-15|2018-01-31|Nuaire Ltd|A heat exchanger device for use in a ventilation unit|
    SE540182C2|2014-10-16|2018-04-24|Swegon Operations Ab|Adaptive defrosting of an air treatment system|
    KR101651443B1|2015-06-16|2016-09-06|주식회사 휴앤텍|Two-pass damper and heat recovering ventilation apparatus using the same|
    SE542351C2|2017-10-20|2020-04-14|Swegon Operations Ab|Flow control arrangement for an air ventilation system|
    法律状态:
    2017-03-07| RPOP| Patent has been republished in amended form after opposition|
    优先权:
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    SE1150709A|SE536208E|2011-07-15|2011-07-15|Air treatment system and ways to control the defrosting of this|SE1150709A| SE536208E|2011-07-15|2011-07-15|Air treatment system and ways to control the defrosting of this|
    DK12176432.8T| DK2546581T3|2011-07-15|2012-07-13|System comprising air-to-air heat exchanger for heat recovery and method of controlling defrosting thereof|
    NO12176432A| NO2546581T3|2011-07-15|2012-07-13|
    EP12176432.8A| EP2546581B1|2011-07-15|2012-07-13|system comprising air-to-air-heat exchanger for heat recovery and method for controlling defrosting thereof|
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