• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
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  • 优先权
    • 专利摘要:
    One object is to provide a control method for a defrost heater in front of an air conditioner which is capable of properly controlling an antifreeze defrost heater arranged on an outdoor unit base, preventing wasteful energy consumption, and reliably preventing re-freezing drainage water. A control method for a defrost heater is provided for an air conditioner for preventing freezing of drainage water on an outdoor unit base by switching on an antifreeze heater installed on the outdoor unit base in a defrost state. The defrost heater is switched on and heated to a given temperature when an outdoor air temperature (ThO-A) and a temperature of an outdoor heat exchanger (ThO-R) are each equal to or lower than preset temperatures and the temperature difference between the outdoor air temperature (ThO-A) and the temperature of the outdoor heat exchanger (ThO-R) is equal to or higher than a set value determined according to the outdoor air temperature (ThO-A).
    公开号:SE1100833A1
    申请号:SE1100833
    申请日:2010-08-27
    公开日:2011-11-09
    发明作者:Yasuhiro Naitoh
    申请人:Mitsubishi Heavy Ind Ltd；
    IPC主号:
    专利说明:

    25 30 2 drainage water. Patent literature 2 further describes a method in which an outdoor air temperature or a temperature of an outdoor heat exchanger is detected during defrosting and the heater is switched on when the temperature is low, thereby preventing re-freezing of drainage water.
    Patent literature 3 further describes a method in which a drainage trough heater is arranged on a drainage trough installed below a cooler of a refrigerator and the drainage trough heater is switched on during the defrosting operation and is also continuously switched on for a predetermined period of time after the defrosting operation. of drainage water and prevent wasteful switching on by varying a switch-off time delay of the drainage tray heater according to a preset temperature of the refrigerator.
    Citation list Patent literature PTL 1: Japanese peer-reviewed patent application, publication number Sho 61-6310 (see Fig. 3).
    PTL 2: Japanese Examined Utility Pattern Application, Publication No. Hei 04-10496 (see Figs. 1 and 2).
    PTL 3: Japanese Unexamined Patent Application, Publication No. 2000-337756 (see Fig. 2).
    Summary of the invention Technical problem The method for switching on the defrost heater by detecting that the outdoor air temperature, or the temperature of the heat exchanger, drops to a preset temperature, or lower, has a problem in that the defrost heater is switched on even in a situation when frost does not form on the outdoor heat exchanger , even when the outdoor air temperature or the temperature of the heat exchanger is low, in other words even in a situation where drainage water does not occur and does not freeze on the base, and consequently wastes energy as opposed to saving energy. In addition, in the method of turning on the defrost heater when the defrost operation is started, when drainage water drips on the base that has not been heated, the drainage water can freeze again. When frost or ice remains on the outdoor unit base, it is in particular very likely that the drainage water will freeze again. As a result of preventing even drainage of drainage water, the drainage water is stored in the form of ice, which causes flock splitting. Furthermore, when the defrost heater is turned on continuously during the defrost operation, the defrost heater may boil dry because the fan is generally stopped and an excessive temperature rise can cause problems.
    The present invention has been made in view of the above circumstances and an object thereof is to provide a control method for a defrost heater for an air conditioner capable of properly controlling an antifreeze defrost heater arranged on an outdoor unit base, to prevent wasteful energy consumption, prevent freezing of drainage water.
    Solution to the problem The control method of a defrost heater for an air conditioner according to the present invention uses the following solutions to solve the problems described above.
    In particular, in one aspect, the present invention provides a control method for a defrost heater for an air conditioner for preventing freezing of drainage water on an outdoor unit base by turning on an antifreeze defrost heater installed on the outdoor unit base in a defrosting state, in which method the defrost is heated. a given temperature when an outdoor air temperature and a temperature of an outdoor heat exchanger are each equal to or lower than preset temperatures, and the temperature difference between the outdoor air temperature and the temperature of the outdoor heat exchanger is equal to or higher than a set value determined according to the outdoor air temperature.
    According to the control method of a defrost heater for an air conditioner according to this aspect of the present invention, the defrost heater is turned on only when the outdoor air temperature and the temperature of the outdoor heat exchanger are equal to or lower than preset temperatures, and the temperature difference between air and air temperature of the outdoor heat exchanger is equal to or higher than a set value determined according to the outdoor air temperature.
    Therefore, if it is very unlikely that frost will form on the outdoor heat exchanger, the defrost heater will not switch on, even when the outdoor air temperature and the temperature of the outdoor heat exchanger are equal to or lower than preset temperatures. The defrost heater is switched on and heated to a given temperature only when the temperature difference between the outdoor air temperature and the temperature of the outdoor heat exchanger is equal to or higher than a set value determined according to the outdoor air temperature, and a start condition for the defrost heater is met. It is therefore possible to minimize the energy supplied to the defrost heater and consequently avoid wasteful energy consumption and achieve energy savings.
    In the control method of a defrost heater for an air conditioner described above, the defrost heater can be turned on before a defrost operation for an outdoor heat exchanger is started and turned off when the defrost operation is started and an outdoor fan is stopped.
    According to this control method, the defrost heater is switched on before the defrosting operation of the outdoor heat exchanger is started and switched off when the defrosting operation is started and the outdoor fan is stopped.
    The outdoor unit base can therefore be heated in advance by the defrost heater, before the defrosting operation for the outdoor heat exchanger is started. Therefore, even if there is residual ice on the outdoor unit base, it is possible to remove the ice in advance and to prevent drainage water dripping from the outdoor heat exchanger 13 when the defrosting operation is started from freezing on the surface of the cooled outdoor unit base. Furthermore, since the defrost heater is switched off when the outdoor fan is stopped, it is possible during the defrosting operation to prevent an excessive temperature increase caused when the defrost heater is boiled dry. Note that during the defrosting operation, drainage water flowing down to the outdoor base unit is heated by the outdoor heat exchanger and there is no risk of re-freezing.
    In the control method of a defrost heater for an air conditioner described above, the defrost heater can be turned on and off again for a predetermined period of time when the defrost operation ends and the outdoor fan is restarted.
    According to this control method, the defrost heater is switched on again and switched on vigorously for a predetermined period of time when the defrosting operation ends and the outdoor fan is restarted. Consequently, in a state in which the amount of drainage water is greatest after the end of the defrosting operation and the drainage water tends to freeze, even when the heating operation is resumed before the drainage water is completely drained from the outdoor unit base, it is therefore possible to heat the drainage water with the defrosting heater. prevent the drainage water from freezing again.
    Problems with, for example, storage of re-frozen drainage water and fan jamming caused by stored re-frozen drainage water can consequently be solved.
    In the control method of a defrost heater for an air conditioner described above, the predetermined time period may be variable according to the number of times defrost is performed, the defrost interval, an operating condition of the outdoor fan, or a cumulative operating time of a compressor.
    According to this control method, the time period during which the defrost heater is vigorously switched on is variable according to the number of times defrost is performed, the defrost interval, the operating condition of the outdoor fan, or the cumulative operating time of the compressor. Accordingly, according to the operating condition of the air conditioner, etc., it is possible to carefully control the time period during which the defrost heater is vigorously switched on after the end of the defrost operation and to make the time period for switching on more suitable and shorter. This can also suppress wasteful energy consumption to achieve energy savings.
    In one of the control methods for a defrost heater for an air conditioner described above, the on and off state of the defrost heater can be controlled by a thermostat which detects a surface temperature of the defrost heater.
    According to this control method, the on and off state of the defrost heater is controlled by a thermostat which detects the surface temperature of the defrost heater. Accordingly, the thermostat detects the surface temperature of the defrost heater, turns off the defrost heater when the surface temperature is equal to or higher than a preset temperature, and turns on the defrost heater when the surface temperature is equal to or lower than a preset temperature, thereby enabling the surface temperature to be controlled within a suitable range. . It is therefore possible to reliably prevent the freezing of drainage water and to prevent an excessive increase in temperature, and consequently suppress wasteful energy consumption and achieve energy savings.
    Beneficial effects of the invention According to the present invention, the defrost heater is not switched on if there is almost no risk of frost forming on the outdoor heat exchanger, even when the outdoor air temperature and the temperature of the heat exchanger are equal to or lower than the preset temperatures. The defrost heater is switched on and heated to a given temperature only when the temperature difference between the outdoor air temperature and the temperature of the outdoor heat exchanger is equal to or higher than a set value, which is determined according to the outdoor air temperature, and the defrost heater start condition is met. It is therefore possible to minimize the energy supplied to the defrost heater, and consequently avoid wasteful energy consumption and achieve energy savings.
    Brief Description of the Drawings Fig. 1 is an exploded perspective view of an outdoor unit in which a method of controlling a defrost heater for an air conditioner is applied according to a first embodiment of the present invention. Fig. 2 is an exploded perspective view of an outdoor heat exchanger and a defrost heater to be installed on an outdoor unit base shown in Fig. 1.
    Fig. 3 is a perspective view of a state in which the defrost heater has been installed on the outdoor unit base shown in Fig. 2.
    Fig. 4 is a control flow diagram for the defrost heater.
    Fig. 5 is a diagram showing a start condition (ON) for the defrost heater.
    Fig. 6 is a diagram showing the relationship between the start condition of the defrost heater and a start condition of defrost.
    Fig. 7 is a diagram showing the start condition (ON) for defrosting.
    Fig. 8 is a control time diagram for the defrost heater.
    Description of Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.
    A First Embodiment Hereinafter, a first embodiment of the present invention will be described using Figs. 1 to 8.
    Fig. 1 is an exploded perspective view showing an outdoor unit of an air conditioner in which the present invention is applied, Fig. 2 is an exploded perspective view showing a main part thereof, and Fig. 3 is a perspective view showing a state in which the defrost heater has been installed.
    An outdoor unit 1 for the air conditioner includes a horizontal elongate, rectangular chassis 7 which consists of an outdoor unit base 2, a front and left surface panel 3, a right surface panel 4, a service cover 5, and a top surface panel 6.
    The space in the chassis 7 is divided by a partition plate 8 in a machine chamber 9 and a heat exchanger chamber 10. A compressor (compressor or comp.) 11, pipe 12, a four-way changeover valve (four-way valve), an expansion valve, and a control box are arranged in the machine chamber 9. An outdoor heat exchanger 13, an outdoor fan, 14, an anti-freeze defrost heater (heater) 15 for the outdoor unit base 2 are arranged in the heat exchanger chamber 10. The compressor 11, the outdoor heat exchanger 13, the outdoor fan 14 and the outdoor defrost heater 2 on the outdoor dehumidifier heater 2.
    As shown in Fig. 3, the outdoor unit base 2 is a rectangular die-cast component having a cup-shaped shape and having an upright wall 16 around its periphery. Fixing legs 17 are formed integrally with the rear surface of the outdoor unit base 2, close to both its left and right sides.
    As shown in Fig. 3, on the bottom surface of the outdoor unit base 2 there are three installation seats 18 used to install the compressor 11 arranged at positions on the left side, an installation seat 19 used to install the outdoor fan 14 is arranged at a position slightly to the right about the center, and four installation seats 20 used to install the outdoor heat exchanger 13 are arranged at positions from a rear side (the closer side in Fig. 3) to a side on the left (the right side in Fig. 3). Each installation seat 18, 19 and 20 is formed in a convex shape so that it projects upwards from the bottom surface of the outdoor unit base 2 with a predetermined height.
    On the bottom surface of the outdoor unit base 2, concave drainage channels 21 and 22 are further arranged, which are slightly lower than the bottom surface of the base, along the front side (the far side in Fig. 3) of the area of the heat exchanger chamber 10 and its back side (the closer side in Figs. 3). Drainage channels 21 and 22 are used to collect drainage water on the bottom surface of the base to drain it to the outside. Drainage holes 23 and 24 are drilled at two lowest positions of the drainage channels 21 and 22, respectively.
    As shown in Figs. 2 and 3, the defrost heater 15 is further installed along a lower portion of the outdoor heat exchanger 13, in the drainage channel 22 which is arranged in the bottom surface of the outdoor unit base 2, and is bent in an L-shape. The defrost heater 15 is formed by bending a rod-like jacket heater, is installed along the drainage channel 22, and is axed at two positions with the brackets 25. The defrost heater 15 is further connected to a harness 26 which is used for energy supply and is arranged 10 15 20 25 30 9 with an excessive temperature rise thermostat 27 which detects the surface temperature of the defrost heater 15, turns off the defrost heater 15 when the surface temperature is equal to or higher than a preset temperature (for example 35 ° C), and turns on the defrost heater 15 when the surface temperature is equal to or lower than a preset temperature (for example 25 ° C).
    Next, a turn-on control method for the defrost heater (heater) 15 will be described with reference to Figs. 4 to 8.
    Fig. 4 is a control flow diagram of the defrost heater 15. When the operation of the air conditioner is started, it is first determined in Step S1 whether the operating mode is a "cooling mode" or a "heating mode". If the operating mode is the cooling mode, it is not necessary to turn on the defrost heater 15, whereby the defrost heater 15 is set to an off state, and the flow returns to the start. If the operating mode is the heating mode, the flow continues to Step S2 and it is determined whether the compressor (compressor or comp.) 11 is in operation.
    If it is determined in Step S2 that the compressor 11 is in a stop state, the defrost heater 15 is set in the off state and the flow returns to the start.
    If the compressor 11 is in operation, the flow continues to Step S3 and it is determined whether the air conditioner performs a defrost operation. If the defrost operation is "ON", the defrost heater 15 is set to the off state and the flow returns to the start. If the defrost operation is "OFF", the flow continues to Step S4.
    Note that the defrost operation is started, for example, when a "defrost start condition" shown in Fig. 7 is met. The "defrost start condition" can be set as desired, but here five conditions (a) to (e) shown in Fig. 7 be met to meet the start condition (ON condition).
    Note that the defrost operation can be implemented by a known method, such as a reverse circuit method, a positive circuit method, or a hot gas bypass method.
    In Step S4, it is determined whether the outdoor fan (outdoor fan motor) 14 is in operation. If the outdoor fan 14 is stopped (OFF), the defrost heater 15 is set to the off state and the flow returns to the start. If the outdoor fan 14 is in operation (ON), the flow continues to Step S5. In step S5, it is determined whether the current time is within a predetermined time period (for example five minutes) after the end of the defrosting operation. In the event of "YES", the defrost heater 15 is switched on. In the event of "NO", the flow continues to Step S6. Accordingly, energy is strongly supplied to the defrost heater 15 only for the predetermined period of time (five minutes) after the end of the defrost operation.
    In Step S6, it is determined whether the defrost heater 15 meets a start condition (ON condition). An example of a start condition (ON condition) of the defrost heater 15 is shown in Fig. 5. Specifically, it is determined that the start condition is met (YES), and the defrost heater 15 is set to the condition when the following four conditions (a) to (d) are met. . In the event of NO, on the other hand, the defrost heater 15 is set to the off state and the flow returns to the start. (a) The operating mode is the heating mode. (b) A temperature of an outdoor heat exchanger (heat exchanger temperature) ThO-R detected by a heat exchanger sensor (not shown) attached to the outdoor heat exchanger 13 is equal to or lower than -2 ° C (ThO-R s -2 ° C ). (c) The temperature difference (ThO-A) - (ThO-R) between an outdoor air temperature ThO-A detected by an outdoor air temperature sensor (not shown) and the temperature of the outdoor heat exchanger ThO-R is equal to or higher than a set value A which is set according to the outdoor air temperature ThO-A ((ThO-A) - (ThO-R) 2 A) (for example when 0 ° C s the outdoor air temperature ThO-A applies, A is set to 4.0, as shown in Fig. 5; when -5 ° C s ThO-A <0 ° C applies, set A to 2.0; when -10 ° C s ThO-A <5 ° C applies, set A to 1.5; when -15 ° C s ThO-A <10 ° C applies, set A to 1.0; and when ThO-A <-15 ° C applies, A is set to -5.0). (d) The outdoor air temperature ThO-A detected by the outdoor air temperature sensor is equal to or lower than 0 ° C (ThO-A s 0 ° C).
    Fig. 6 further shows the respective operating start areas which are based on the "start condition for the defrost heater" and the "start condition for defrost".
    More specifically, the temperature of the outdoor heat exchanger ThO-R is inevitably lower than the outdoor temperature ThO-A when a heating operation is performed because heat is absorbed from the outdoor air when a heat pump with air source is used, the relationship between them being indicated in the area below the dotted line , and the start condition of the defrost heater covers the area of the defrost operation. Since the relationship between the temperature of the outdoor heat exchanger ThO-R and the outdoor air temperature ThO-A changes in the direction of the solid arrow when the heating operation starts, the defrosting operation starts after the defrost heater is turned on.
    Note that the "starting condition for defrosting" in this embodiment differs depending on whether the cumulative operating time of the compressor 11 is equal to or longer than 150 minutes or is shorter than 150 minutes.When the cumulative operating time is equal to or longer than 150 minutes starts defrosting early so as not to leave frost, as the time period for the heating operation is longer, compared to the case when the cumulative operating time is shorter than 150 minutes, and frost is formed easily.If the starting condition for defrosting is met earlier, in some cases the defrost operation before the defrost heater 15 is turned on.
    As described above, the defrost heater 15 is turned on to heat the outdoor unit base 2 only when the operating mode is the heating mode, when the compressor 11 and the outdoor fan (outdoor fan motor) 14 are both in operation (on), when the defrost heater start condition is met, and when the defrost operation is not performed. the current time is within five minutes after the end of the defrosting operation.
    However, the defrost heater 15 has the thermostat 27 to prevent excessive temperature rise which detects the surface temperature of the defrost heater 15 to perform on / off defrost heater 15. As shown in Step S7 for example, the defrost heater 15 is turned off if the surface temperature is equal to or higher than 35 ° C and the defrost heater 15 is switched on if the surface temperature is equal to or lower than 25 ° C.
    The heating temperature is therefore controlled within a set range from 25 ° C to 35 ° C to thereby prevent an excessive temperature increase.
    Fig. 8 is a control time diagram of the defrost heater 15 at the time of the defrost operation described above.
    At the time of the heating operation, the defrost heater 15 is turned on when the compressor 11 and the outdoor fan (outdoor fan motor) 14 are operated in an environment in which frost is easily formed on the outdoor heat exchanger 13, if the starting condition of the defrost heater 15 is met, to thereby start energy. Accordingly, the outdoor unit base 2 is preheated by the defrost heater 15 to a given temperature, before the defrost operation is started. As shown in Fig. 6, when the operation continues in this state, the start condition for defrosting is soon met, and the defrosting operation starts.
    The compressor 11 stops temporarily, the four-way changeover valve (four-way valve) (not shown) changes to change the cooling cycle from a heating cycle to a defrost cycle, and then the compressor 11 continues and the outdoor fan 14 is stopped. The defrost operation is started in this way. On the other hand, when the start condition for defrosting is met, the compressor 11 stops temporarily to start the defrosting operation; consequently, the defrost heater 15 is turned off and this off state (shutdown) continues during the defrost operation.
    When frost is removed from the outdoor heat exchanger 13 by the defrost operation, and the end of the defrost is detected by a temperature increase of the outdoor heat exchanger 13, the compressor 11 is stopped temporarily and the operation of the outdoor fan 14 is started to thereby end the defrost operation. At this time, the defrost heater 15 is turned on vigorously for a predetermined period of time (five minutes), regardless of whether the start condition of the defrost heater is met or not. Accordingly, the defrost heater 15 starts heating and continues to heat for the predetermined period of time (five minutes), unless the outdoor fan (outdoor fan motor) 14 is stopped.
    As described above, drainage water flowing from the outdoor heat exchanger 13 to the outdoor unit base 2 during the heating operation of the defrost heater 15, which is turned on vigorously during the predetermined period of time after the defrost operation ends, is passed through the drainage channels 21 and 22 without delay to the drain 23. the lowest positions of the drainage channels 21 and 22, and are drained to the outside without freezing on the outdoor unit base 2.
    According to this embodiment, the following advantages are offered. In this embodiment, the temperature difference between the outdoor air temperature ThO-A and the temperature of the outdoor heat exchanger ThO-R is checked as a start condition (ON condition) for the defrost heater. This is because an increase in the amount of frost on the outdoor heat exchanger 13 prevents heat exchange, thereby increasing the temperature difference between the outdoor air temperature ThO-A and the temperature of the outdoor heat exchanger ThO-R, and this increase in temperature difference increases the amount of frost on the outdoor heat exchanger 13 and defrost heater. it is stated that it is necessary.
    In other words, the temperature difference between the outdoor air temperature ThO-A and the temperature of the outdoor heat exchanger ThO-R is small when it is not necessary to turn on the defrost heater 15, because the amount of frost on the outdoor heat exchanger 13 is small, even if the outdoor air temperature is low. In this case, the defrost heater 15 is set to the off state, thereby making it possible to reduce wasteful energy consumption.
    It is therefore possible to achieve an efficient operation by supplying minimal energy to the defrost heater 15, in order thereby to avoid wasteful energy consumption and achieve energy savings.
    Furthermore, since the defrost heater 15 is turned on before the defrost operation of the outdoor heat exchanger 13 starts, and turned off when the defrost operation starts and the outdoor fan 14 stops, the outdoor base unit 2 can be heated in advance by the defrost heater 15, before the defrost operation of the outdoor heat exchanger 13. Thus, even if ice remains on the outdoor unit base 2, it is possible to remove the ice in advance and to prevent drainage water dripping from the outdoor heat exchanger 13 when the defrosting operation is started from re-freezing on the surface of the cooled outdoor unit base 2. Since the defrost heater 15 is turned off furthermore, when the outdoor fan 14 is stopped, it is possible during the defrosting operation to prevent an excessive temperature increase caused when the defrost heater 15 is boiled dry.
    The defrost heater 15 is further turned on again and turned on vigorously during the predetermined time period when the defrost operation ends and the operation of the outdoor fan 14 continues. In a state in which the amount of drainage water is greatest after the end of the defrosting operation and the drainage water tends to freeze, even when the heating operation continues before the drainage water is drained completely from the outdoor unit base 2, it is therefore possible to heat the drainage water with the defrosting heater 15. time period, and to reliably prevent the drainage water from re-freezing. Problems with, for example, storage of re-frozen drainage water and fan jamming caused by stored re-frozen drainage water can consequently be solved.
    The on and off state of the defrost heater 15 is controlled by the thermostat 27 which detects the surface temperature of the defrost heater 15. The thermostat 27 detects the surface temperature of the defrost heater 15, switches off the defrost heater 15 if the surface temperature is equal to or higher than a preset temperature, and turns on the defrost heater 15 if with or below a preset temperature. It is therefore possible to control the surface temperature of the defrost heater 15 within a suitable range. Consequently, it is possible to reliably prevent the freezing of drainage water and to prevent an excessive increase in temperature, thereby suppressing wasteful energy consumption and achieving energy savings.
    A Second Embodiment In the following, a second embodiment of the present invention will be described.
    This embodiment differs from the first embodiment described above in the manner of setting the time period for switching on the defrost heater 15 which is powerfully switched on after the end of the defrosting operation. The other features are the same as in the first embodiment and a description thereof will therefore be omitted.
    In the first embodiment described above, the time period for the powerful switch-on is set to a fixed time period, for example five minutes. However, the time period for the powerful switch-on can be made variable according to (a) the number of times the defrosting operation is performed, (b) the time interval of the defrosting operation, (c) the operating condition of the outdoor fan 14 (Hö, Me, Lå, etc.), or (d) the cumulative operating time of the compressor 11.
    As described above, when the period of time during which the defrost heater 15 is vigorously switched on after the end of the defrost operation is made variable according to the number of times the defrost operation is performed, the defrost interval, the operating condition of the outdoor fan 14, or the cumulative operating time of the compressor 11, the time period during which the defrost heater 15 is powerfully switched on after the end of the defrosting operation according to the operating condition of the air conditioner, etc., and to make the time period of the powerful switch-on more suitable and shorter. This can also suppress wasteful energy consumption and achieve energy savings.
    Note that the present invention is not limited to the embodiments described above and appropriate modifications may be made without departing from the scope of the invention. For example, specific numerical conditions set for the defrost heater start condition and the defrost start condition described in the embodiments described above are merely examples, and the present invention is of course not limited thereto.
    At the time of the defrost operation in the control time diagram of the defrost heater 15 shown in Fig. 8, when the compressor 11 is driven or stopped, its rotational speed is further controlled; the shift control of the four-way shift valve changes by several seconds relative to the continuation of the compressor 11; and when the outdoor fan 14 is driven or stopped, its rotational speed is further controlled. In these control operations, appropriate changes can be made within the scope described in the embodiments described above.
    List of reference designations 1 outdoor unit 2 outdoor unit base 11 compressor (compressor or comp.) 13 outdoor heat exchanger 14 outdoor fan (outdoor fan motor) 10 15 20 25 16 15 defrost heater (heater) 27 thermostat ThO-A Outdoor air temperature ThO-R outdoor temperature heating temperature value
    权利要求:
    Claims (1)
    [1]
    1. 0 15 20 25 30 17 REQUIREMENTS. Control method for a defrost heater for an air conditioner to prevent freezing of drainage water on an outdoor unit base by switching on an antifreeze defrost heater installed on the outdoor unit base in a defrost state, the defrost heater turning on and heating an air temperature to a given temperature temperature of an outdoor heat exchanger individually is equal to or lower than preset temperatures and the temperature difference between the outdoor air temperature and the temperature of the outdoor heat exchanger is equal to or higher than a set value determined according to the outdoor air temperature. . The method of controlling a defrost heater for an air conditioner according to claim 1, wherein the defrost heater is turned on before a defrost operation for an outdoor heat exchanger is started and turned off when the defrost operation is started and an outdoor fan is stopped. . Control method for a defrost heater for an air conditioner according to claim 2, wherein the defrost heater is switched on again and switched on vigorously for a predetermined period of time when the defrosting operation ends and the outdoor fl starts again. . A method of controlling a defrost heater for an air conditioner according to claim 3, wherein the predetermined time period is variable according to the number of times defrost is performed, a defrost interval, an operating condition of the outdoor fan, or a cumulative operating time of a compressor. . Control method for a defrost heater for an air conditioner according to any one of claims 1 to 4, wherein the on and off state of the defrost heater is controlled by a thermostat which detects a surface temperature of the defrost heater. 18
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    法律状态:
    2021-03-30| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    JP2009208101A|JP5554038B2|2009-09-09|2009-09-09|Defrost heater control method for air conditioner|
    PCT/JP2010/064589|WO2011030678A1|2009-09-09|2010-08-27|Defrost heater control method for air conditioner|
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