EP0789201A2 - Klimaanlage mit aufgeteilten Geräten - Google Patents

Klimaanlage mit aufgeteilten Geräten Download PDF

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Publication number
EP0789201A2
EP0789201A2 EP96116437A EP96116437A EP0789201A2 EP 0789201 A2 EP0789201 A2 EP 0789201A2 EP 96116437 A EP96116437 A EP 96116437A EP 96116437 A EP96116437 A EP 96116437A EP 0789201 A2 EP0789201 A2 EP 0789201A2
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EP
European Patent Office
Prior art keywords
ice
outdoor
air conditioner
split type
type air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96116437A
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English (en)
French (fr)
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EP0789201B1 (de
EP0789201A3 (de
Inventor
Toshiharu Nishizuka
Koji Hatano
Hideki Matsumi
Masatoshi Nagano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0789201A2 publication Critical patent/EP0789201A2/de
Publication of EP0789201A3 publication Critical patent/EP0789201A3/de
Application granted granted Critical
Publication of EP0789201B1 publication Critical patent/EP0789201B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing

Definitions

  • the present invention relates to a split type air conditioner which has an indoor unit and an outdoor unit.
  • FIG. 4 is a circuit diagram of an electrical configuration of a conventional split type air conditioner capable of performing cooling and heating operation.
  • the conventional split type air conditioner comprises an indoor unit 1, an outdoor unit 2 and an indoor-outdoor connection cable 3 for electrically connecting the indoor unit 1 and the outdoor unit 2 with each other.
  • a main switch 4 thereof is connected to a power source 22, and the other end of the main switch 4 is connected to an indoor electronic control unit 50.
  • An indoor fan motor 6, such as a transistor motor which is controlled by a transistor circuit, is connected to the indoor electronic control unit 50.
  • a main relay 7 is ON/OFF-controlled by the indoor electronic control unit 50.
  • a heating operation relay 8 shown in FIG. 4 is turned on at the time of heating.
  • a de-ice operation detection circuit 9 is provided to detect de-ice operation.
  • the outdoor unit 2 is provided with an outdoor electronic control unit 11 to which electric power is supplied from a transformer 17 for the outdoor electronic control unit.
  • a de-ice operation relay 10 and a four-way valve 12 are controlled by the outdoor electronic control unit 11.
  • the four-way valve 12 has a function for selecting the refrigerant passage for a cooling cycle or a heating cycle depending on the cooling or heating operation.
  • the four-way valve 12 is operated by the ON/OFF operation of a four-way valve relay 15 controlled by the outdoor electronic control unit 11.
  • the outdoor unit 2 is provided with an outdoor fan motor 13, such as an induction motor, and a capacitor 14 for the outdoor fan motor.
  • the outdoor fan motor 13 is driven and controlled by the ON/OFF operation of an outdoor fan motor relay 16 controlled by the outdoor electronic control unit 11.
  • the outdoor unit 2 is also provided with a compressor 18 and a compressor capacitor 19 as shown in FIG. 4.
  • the outdoor unit 2 is provided with a temperature sensor 20 for an outdoor heat exchanger and an outdoor-air temperature sensor 21.
  • the one end of the main switch 4 of the indoor unit 1 is connected to the power source 22, and the other end of the main switch 4 is connected to the indoor electronic control unit 50.
  • the indoor electronic control unit 50 starts control operation and rotates the indoor fan motor 6. By the rotation of the indoor fan motor 6, indoor air passes through an indoor heat exchanger (not shown), thereby starting the circulation of the indoor air.
  • the indoor electronic control unit 50 activates the main relay 7 to supply electric power from the power source 22 to the outdoor unit 2.
  • electric power is supplied from the power source 22 to the compressor 18 to start the rotation of the compressor 18.
  • electric power is also supplied from the power source 22 to the outdoor fan motor 13 via the outdoor fan motor relay 16 to start the supply of outdoor air to an outdoor heat exchanger (not shown).
  • the four-way valve 12 for refrigerant passage selection is connected so that electric power is supplied to the four-way valve 12 via the heating operation relay 8 and the four-way valve relay 15.
  • the heating operation relay 8 is maintained in the OFF state by the indoor electronic control unit 50. In this state, the split type air conditioner starts cooling operation.
  • the indoor electronic control unit 50 activates the heating operation relay 8, and electric power is supplied from the power source 22 to the four-way valve 12 via the four-way valve relay 15.
  • the refrigerant passage for the heating cycle is selected by this operation, and heating operation starts.
  • outdoor air is supplied to the outdoor heat exchanger by the outdoor fan motor 13, and the heat of the outdoor air is transferred to the refrigerant via the outdoor heat exchanger.
  • the refrigerant evaporates and is gasified.
  • the refrigerant is then supplied to the indoor heat exchanger by the compressor 18.
  • the temperature sensor 20 detects the temperature of the outdoor heat exchanger at all times, and the outdoor-air temperature sensor 21 also detects outdoor-air temperature at all times.
  • outdoor-air temperature happens to become relatively high during heating operation, or when the temperature of the outdoor heat exchanger happens to become relatively high, the discharge pressure of the compressor 18 becomes high, thereby causing a overload condition of the compressor 18.
  • the outdoor electronic control unit 11 deactivates the outdoor fan motor relay 16, thereby to reduce the heat exchange of the outdoor heat exchanger.
  • the outdoor electronic control unit 11 deactivates the four-way valve relay 15 to set the four-way valve 12 to the cooling cycle side.
  • the outdoor electronic control unit 11 activates a de-ice operation detection relay 10 to supply electric power to the de-ice operation detection circuit 9.
  • the outdoor electronic control unit 11 informs the indoor electronic control unit 50 that the de-ice operation is carried out.
  • the cooling operation is performed during the de-ice operation, and ice is removed by the heating of the outdoor heat exchanger.
  • the indoor electronic control unit 50 performs control operations, such as the control of the entry of cool air to the indoor space, by stopping or decelerating the indoor fan motor 6 for example.
  • the above-mentioned conventional split type air conditioner requires an outdoor electronic control unit provided in the outdoor unit.
  • the semiconductor components in electronic control units are more susceptible to heat than other components.
  • Semiconductors in the outdoor electronic control unit may be heated beyond their allowable temperature limit and may cause thermal runaway when used in the outdoor electronic control unit which is heated by high-temperature outdoor air or direct sunlight during cooling operation.
  • it is essential to take actions such as the addition of heat sinks to the electronic components in the outdoor electronic control unit.
  • the conventional outdoor electronic control unit has a factor which lowers the serviceability for maintenance because of the increase in component count.
  • the conventional split type air conditioner is provided with electronic control units in both the indoor unit and outdoor unit, resulting in increase in production cost.
  • some conventional split type air conditioners perform de-ice operation control during heating operation by using only the indoor electronic control unit.
  • this kind of indoor electronic control unit is required to infer the temperature of the heat exchanger of the outdoor unit from the temperature of the heat exchanger of the indoor unit and the current flowing through the circuit.
  • various setting values must be selectively determined for each model, thereby impairing versatility in the de-ice operation control.
  • An object of the present invention is to provide a split type air conditioner which can resist high-temperature and attains highly versatile de-ice operation control and can perform de-ice operation control accurately and properly even during heating operation in cold area where an outside-air temperature is low.
  • Another object of the present invention is to provide a split type air conditioner having enhanced maintainability by removing the outdoor electronic control unit.
  • the split type air conditioner of the present invention having an indoor unit and an outdoor unit comprises:
  • the temperature detection means provided in the outdoor heat exchanger of the outdoor unit detects the frosted condition of the outdoor heat exchanger and transmits the frosted condition of the outdoor heat exchanger to the electronic control unit provided in the indoor unit.
  • the electronic control unit then issues a de-ice operation command. Therefore, the split type air conditioner of the present invention can properly perform de-ice operation control without providing an electronic control unit in the outdoor unit. Consequently, the de-ice operation control unit can be made at lower cost and can have enhanced maintainability. Additionally, the split type air conditioner of the present invention can attain de-ice operation control superior in accuracy and versatility, since the frosted/defrosted conditions of the outdoor heat exchanger are directly detected by the measurement of the temperature of the outdoor heat exchanger.
  • FIGs. 1 to 3 An embodiment of the split type air conditioner of the present invention is explained below referring to FIGs. 1 to 3.
  • FIG. 1 is a circuit diagram of an electric configuration of this embodiment of the split type air conditioner capable of cooling and heating.
  • FIG. 2 is a flowchart showing control performed at the start of de-ice operation of this embodiment.
  • FIG. 3 is a flowchart showing control performed at the end of de-ice operation of this embodiment.
  • the split type air conditioner comprises an indoor unit 100, an outdoor unit 200 and an indoor-outdoor connection cable 300 for electrically connecting the indoor unit 100 and outdoor unit 200 with each other.
  • a main switch 4 In the indoor unit 100, one end of a main switch 4 is connected to a power source 22, and the other end of the main switch 4 is connected to an electronic control unit 5.
  • a main relay 7, a heating operation relay 8 and an outdoor fan motor relay 16 are ON/OFF-controlled by the electronic control unit 5. The heating operation relay 8 is turned on in heating operation mode.
  • the outdoor unit 200 is not provided with an electronic control unit.
  • the indoor unit 100 is provided with the electronic control unit 5.
  • a four-way valve 12 is ON/OFF-controlled by the heating operation relay 8.
  • the four-way valve 12 has a function for selecting the refrigerant passage for a cooling cycle or a heating cycle depending on the cooling or heating operation.
  • the outdoor unit 200 is provided with an outdoor fan motor 13, such as an induction motor, and a capacitor 14 for the outdoor fan motor.
  • the outdoor fan motor 13 is connected to an outdoor fan motor selector 25 which drives and controls the outdoor fan motor 13.
  • a connection terminal X of the outdoor fan motor selector 25 is connected to the outdoor fan motor relay 16, such as a solid-state relay (SSR), via a CT (current transformer) 24.
  • the connection terminal Y of the outdoor fan motor selector 25 is connected to the heating operation relay 8 for ON/OFF-controlling the four-way valve 12.
  • the outdoor unit 200 is provided with a compressor 18, and a known compressor capacitor 19 is connected to the compressor 18. Furthermore, the outdoor unit 200 is provided with a mechanical temperature detector 23 used as a temperature sensor for an outdoor heat exchanger (not shown).
  • the mechanical temperature detector 23 provided to the outdoor heat exchanger comprises a bimetal or the like to detect change of temperature of the outdoor heat exchanger. As a result, the frosted/defrosted conditions of the outdoor heat exchanger is detected by the mechanical temperature detector 23.
  • the ON and OFF operation temperatures, at which the mechanical temperature detector 23 is activated, are set in consideration of the growth rate of frost and the degree of defrosting at the outdoor heat exchanger, and the thermal response and variations in various factors of the mechanical temperature detector 23. In the mechanical temperature detector 23 of this embodiment, the ON operation temperature is set at -3°C, and the OFF operation temperature is set at 4°C.
  • the indoor unit 100 is connected to the power source 22.
  • the main switch 4 When the main switch 4 is turned on, electric power is supplied to the electronic control unit 5.
  • the electronic control unit 5 then starts control operation and rotates the indoor fan motor 6.
  • indoor air passes through an indoor heat exchanger (not shown) and circulates in the indoor space.
  • the electronic control unit 5 turns on the main relay 7, thereby supplying electric power from the power source 22 to the outdoor unit 200.
  • electric power is supplied to the compressor 18, and the compressor 18 starts to rotate.
  • electric power is also supplied from the power source 22 to the outdoor fan motor 13 via the outdoor fan motor relay 16, such as a solid-state relay (SSR), so as to start the supply of outdoor air to the outdoor heat exchanger.
  • the outdoor fan motor relay 16 is turned on, whereby an outdoor fan control relay 26 is turned on.
  • the electronic control unit 5 turns on the heating operation relay 8, so as to turn on the four-way valve 12. As a result, the refrigerant passage for the heating cycle is selected and heating operation starts.
  • the CT 24 provided in the electronic control unit 5 functions as receiving means for detection signal of the mechanical temperature detector 23. During usual heating operation, the CT 24 recognizes a certain current value. In these circumstances, when the temperature of the outdoor heat exchanger becomes less than -3°C, the mechanical temperature detector 23 is turned on, and the connection of the outdoor fan motor selector 25 is switched from the connection terminal X to the connection terminal Y. As a result, electric power supplied to the outdoor fan motor 13 through the connection terminal X of the outdoor fan motor selector 25 is supplied from the connection terminal Y connected to the heating operation relay 8. Consequently, no current flows through the circuit of the connection terminal X of the outdoor fan motor selector 25, and the current value at the CT 24 changes from the certain value to almost 0.
  • FIG. 2 is the flowchart showing control performed at the start of the de-ice operation in accordance with this embodiment.
  • the mechanical temperature detector 23 is turned on first, and the value of the current flowing through the CT 24 provided in the electronic control unit 5 is reduced to almost 0 (step 101).
  • a determination means of the electronic control unit 5 confirms that the relay 16 is in the ON state (step 102).
  • a timer is used to confirm that the no-current time at the CT 24 has continued for a certain time period (such as 50 seconds) or more (step 103).
  • the electronic control unit 5 delivers a de-ice operation start signal when a frost detection signal of the mechanical temperature detector 23 is received continuously for a certain time period by the CT 24.
  • the determination means selects a de-ice operation prohibition period depending on the present count number N of de-ice operations stored in a counter of the electronic control unit 5 (step 104).
  • the determination means determines whether the operation time after the end of the last de-ice operation is not less than a de-ice operation prohibition period (such as 30 minutes) or not.
  • a de-ice operation prohibition period such as 30 minutes
  • the count number N of de-ice operations is incremented by 1 (step 107), and the timer is turned on to compute the de-ice operation time period (step 108).
  • the determination means determines whether the operation time period after the end of the last de-ice operation is not less than another de-ice operation prohibition period (such as 60 minutes) (step 105).
  • another de-ice operation prohibition period such as 60 minutes
  • the present count number N of de-ice operations is incremented by 1 (step 107), and the timer is turned on to compute the de-ice operation time period (step 108).
  • the determination means increments the number of de-ice operations stored in the counter.
  • the determination means then delivers the de-ice operation start signal to activate the timer so as to compute the de-ice operation time period as described above.
  • the electronic control unit 5 turns off the heating operation relay 8, whereby the four-way valve 12 and the outdoor fan motor 13 are turned off.
  • the de-ice operation starts.
  • the refrigerant passes through the passage for the cooling cycle, and the cooling operation is carried out.
  • FIG. 3 is the flowchart showing control at the end of the de-ice operation in accordance with this embodiment.
  • the mechanical temperature detector 23 is turned off first, and the value of the current flowing through the CT 24 is changed from almost 0 to a certain value.
  • the determination means then turns off the outdoor fan motor relay 16 once (step 202). After this, the determination means stops the outdoor fan motor 13 again.
  • the determination means computes a de-ice time period t from the start of the de-ice operation to the change to the OFF state of the mechanical temperature detector 23 (that is, the OFF state means that the current value of the CT 24 becomes larger than 0 and reaches a predetermined value) by using a computing means and the timer, which are provided in the electronic control unit 5.
  • the determination means computes the de-ice time period t from the time when the current value of the CT 24 is almost 0 to the time when the current value of the CT 24 becomes larger than 0. It is noted that in this embodiment the start of the de-ice operation corresponds to the time when the mechanical temperature detector 23 is turned on.
  • the electronic control unit 5 determines a de-ice operation time period corresponding to the computed de-ice time period t according to the table, and the de-ice operation is continued for the de-ice operation time period.
  • the de-ice time period t is less than 1 minute in this embodiment, the de-ice operation is forcibly carried out for 1 minute.
  • the de-ice time period t is in the range of 1 minute or more and less than 3 minutes, the de-ice operation is stopped.
  • the de-ice time period t is in the range of 3 minutes or more and less than 6 minutes, the de-ice operation is continued for 1 minute and then stopped.
  • the de-ice time period t is in the range of 6 minutes or more and less than 9 minutes
  • the de-ice operation is continued for 2 minute and then stopped.
  • the de-ice time period t is 9 minutes or more, the de-ice operation is continued for 3 minute and then stopped.
  • the electronic control unit 5 issues a de-ice operation stop command after a predetermined de-ice operation time period has passed, and the de-ice operation stops. Therefore, the total de-ice operation time period is defined as a period from the start of the de-ice operation to the time when the mechanical temperature detector 23 is turned off plus a de-ice operation continuation time determined according to the table depending on the period of the de-ice time.
  • the de-ice operation is carried out forcibly at least 1 minute, regardless of the time from the start of the de-ice operation to the time when the mechanical temperature detector 23 is turned off.
  • the maximum total de-ice operation time period is set at 12 minutes.
  • the outdoor fan control relay 26 which is controlled by the outdoor fan motor relay 16, performs outdoor fan control to prevent the pressure of the compressor 18 from rising high, regardless of the ON or OFF state of the mechanical temperature detector 23.
  • the outdoor fan motor 13 is ON/OFF-controlled by the ON/OFF operation of the outdoor fan motor relay 16.
  • the outdoor fan motor 13 is in a condition that electric power can be supplied again from the connection terminal X of the outdoor fan motor selector 25.
  • the outdoor fan motor relay 16 is in the OFF state, the outdoor fan motor 13 is in the OFF state.
  • connection of the outdoor fan motor selector 25 is shifted from the connection terminal X to the connection terminal Y by turning on the outdoor fan motor relay 16. Therefore, electric power is supplied from the power source 22 to the outdoor fan motor 13 via the heating operation relay 8.
  • the outdoor fan can be controlled by the outdoor fan motor relay 16 regardless of the ON or OFF state of the mechanical temperature detector 23.
  • the above-mentioned embodiment of the split type air conditioner is further provided with an indoor temperature detector (not shown) for detecting the temperature of the heat exchanger in the indoor unit 100.
  • the indoor temperature detector detects a temperature higher than a predetermined value at the indoor heat exchanger
  • the indoor temperature detector transmits the detection information to the electronic control unit 5.
  • the temperature information of the indoor heat exchanger has been included as one of the de-ice operation start conditions stored in the electronic control unit 5.
  • the de-ice operation start command is issued.
  • the de-ice operation start time can thus be selected more appropriately by providing such indoor temperature detection means and by including the temperature condition at the indoor heat exchanger in the de-ice operation start conditions as described above.
  • frost is generated in the outdoor unit 200 of the split type air conditioner
  • the growth rate of the frost differs depending on whether the frost grows in a low outdoor-air temperature condition because the temperature of the outdoor heat exchanger is lowered by low outdoor-air temperature or the frost grows in a relatively high outdoor-air temperature condition because the pressure of the compressor is lowered when the outdoor fan is stopped to prevent the compressor pressure from rising high.
  • the frost gradually grows because the pressure of the compressor is lowered when the outdoor fan is stopped in a relatively high outdoor-air temperature condition wherein the outdoor fan is ON/OFF-controlled to prevent the pressure of the compressor from rising high.
  • a so-called normal heating operation time period between a de-ice operation and the next of the de-ice operation can be made longer in the latter case than in the former case.
  • the de-ice operation start time can be delayed so that the deviation of the indoor air-conditioning temperature from a setting temperature is as less as possible.
  • the indoor temperature detector provided for the indoor heat exchanger detects the high-pressure condition of the indoor heat exchanger by measuring the temperature and sends the temperature information to the electronic control unit 5.
  • the electronic control unit 5 has recognized in advance of the relationship between the high pressure at the indoor heat exchanger 5 and the low pressure at the outdoor heat exchanger. Therefore, the electronic control unit 5 recognizes the high-pressure condition of the indoor heat exchanger according to the temperature information and estimates the low-pressure condition of the outdoor heat exchanger.
  • the electronic control unit 5 issues a de-ice operation start command when the electronic control unit 5 recognizes a low pressure value not more than a predetermined value wherein the de-ice operation is necessary for the outdoor heat exchanger.
  • the grow rate of frost in the outdoor unit 200 is estimated by using the temperature information from the indoor heat exchanger, and the temperature information from the indoor heat exchanger has been included as a condition of the de-ice operation start command conditions. Accordingly, it is possible to accurately determine the de-ice operation start time. Consequently, in the split type air conditioner of this embodiment, the deviation of the indoor temperature from a setting temperature is minimized by extending the heating operation time as long as possible and by delaying the de-ice operation start time.
  • the de-ice operation control is carried out in accordance with a memory table including informations on the amount of flow at the indoor fan, and the time period from the start of the de-ice operation to the start of the turning-off operation of the mechanical temperature detector 23. Accordingly, the de-ice operation of this embodiment can be performed at more appropriate times.
  • the de-ice operation control unit can be made more high temperature resistive at lower cost and have enhanced serviceability or maintainability.
  • the frosted/defrosted conditions of the outdoor heat exchanger are directly detected by measuring the temperature of the outdoor heat exchanger. Therefore, the determination of setting temperatures and other values are not required in designing various models. Consequently, the split type air conditioner of this embodiment can have high versatility.
  • the mechanical temperature detection means namely the mechanical temperature detector provided in the heat exchanger of the outdoor unit, detects the frost condition at the heat exchanger of the outdoor unit.
  • the detection means transmits the information on the frost condition to the electronic control unit provided in the indoor unit by using the drive power source circuit for the outdoor fan motor.
  • the electronic control means namely the electronic control unit of the indoor unit, computes a de-ice operation time period depending on the transmitted information on the frost condition at the heat exchanger of the outdoor unit, and issues a de-ice operation start command. Since the split type air conditioner of the present invention is structured as described above, the split type air conditioner can perform de-ice control properly stably and reliably by means of the electronic control means including delicate semiconductor devices in the indoor unit.
  • the mechanical temperature detection means provided in the indoor heat exchanger detects a high-pressure state of the compressor by measuring its temperature and recognizes a low-pressure condition of the outdoor heat exchanger depending on the temperature.
  • the split type air conditioner starts the de-ice operation.
  • the de-ice operation start time can be determined accurately. Consequently, in the split type air conditioner of the present invention, the deviation of the indoor temperature from a setting temperature can be minimized by extending the heating operation time as long as possible and by delaying the start of the de-ice operation.
  • the same four-conductor cables as that for the conventional split type air conditioner can be used as the indoor-outdoor connection cable for the de-ice operation control.
  • the outdoor fan can be controlled so as to prevent the compressor pressure from rising high even when the mechanical temperature detection means provided in the outdoor heat exchanger has been activated. In other words, the cost reduction by eliminating delicate and expensive electronic control means in the outdoor unit, and the suitable control in conformity with the performances of the air conditioner can be attained without changing number of conventional four-conductor indoor-outdoor connection cables.
  • the electronic control unit of the split type air conditioner of the present invention is set previously in consideration of the thermal response and variations in various factors of the detection means. Therefore, the electronic control unit accurately detects such condition that the de-ice operation is necessary, and the electronic control unit also detects such condition that the stop of the de-ice operation is necessary. Accordingly, the split type air conditioner is structured to perform the de-ice operation properly.
  • the split type air conditioner of the present invention estimates the amount of frost generated at the heat exchanger of the outdoor unit on the basis of the time from the output of a frost detection signal to the output of a de-ice operation end signal from the mechanical temperature detection means provided in the outdoor unit.
  • the split type air conditioner then adds such a correction time that which varies depending on the period, to the period from the start of the de-ice operation to the input of the de-ice operation end signal.
  • the de-ice time period can have a proper value.
  • the split type air conditioner also corrects the thermal response and variations in various factors of the mechanical temperature detection means. Consequently, the split type air conditioner of the present invention can perform highly accurate de-ice operation control even when the outdoor-air temperature is low.
  • the amount of frost is small in the outdoor unit of the split type air conditioner of the present invention, and this eventually shortens the period between the output of the frost detection signal and the output of the de-ice operation end signal from the mechanical temperature detection means provided in the outdoor unit.
  • the de-ice time period in the split type air conditioner of the present invention is forcibly determined to have a predetermined value when the period from the output of the frost detection signal to the output of the de-ice operation end signal is not more than a predetermined value. In this way, the generation of such unusual noise is minimized at the time of the switching of the four-way valve.
  • a de-ice operation prohibition period is provided to specify the time period from the end of a de-ice operation to the start of the next de-ice operation so that the de-ice operation is forcibly disabled for a predetermined time period.
  • This de-ice operation prohibition period is constant regardless of the number of de-ice operations.
  • the temperature of the outdoor heat exchanger at the end of the de-ice operation has a relatively high value wherein frost is relatively hard to grow. Therefore, the de-ice operation prohibition period after repetition of several de-ice operations should be made longer than the prohibition period at the start of air conditioner operation.
  • the time period from the end of a de-ice operation to the start of the next de-ice operation after repetition of several de-ice operations has been is longer than the time period from the start of air conditioner operation to the start of the first de-ice operation.
  • the growth of frost is delayed after the de-ice operation has been conducted several times.
  • the number of de-ice operations from the start of air conditioner operation is counted so as to properly control the de-ice operation prohibition period.
  • the counter provided in the outdoor unit computes the number of de-ice operations from the start of air conditioner operation.
  • the number of de-ice operations is reset only when the electronic control unit used as receiving means to be supplied with operation start/stop signals is supplied with a stop signal.
  • the split type air conditioner in accordance with this invention resets the number of de-ice operations at appropriate timing.
  • the number of de-ice operations is not reset at the time of the selection of heating/cooling operation modes because of the following reasons.
  • the temperature of the outdoor heat exchanger has become a relatively high temperature as a matter of course at the time when the heating operation mode is switched to the cooling operation mode. If the number of de-ice operations is reset at the time of operation mode selection, the correction of the de-ice operation prohibition period becomes almost meaningless, and the heating operation time becomes short. This results in increase in the deviation of the indoor temperature from a setting temperature.
  • the CT of the indoor fan drive circuit, the timer and the computing means provided in the indoor unit are used to compute the amount of flow at the indoor fan until up to the start of a de-ice operation. Furthermore, the determination means and the table are used to determine a de-ice operation time period. When the amount of flow at the indoor fan is changed, the amount of frost generated at the outdoor heat exchanger is also changed. Therefore, the split type air conditioner of the present invention corrects the de-ice operation time period depending on the amount of flow at the indoor fan, so as to appropriately set the de-ice operation time period. Thereby the heating operation time period is extended as long as possible. Moreover, the split type air conditioner of the present invention directly detects the temperature of the outdoor heat exchanger by using the mechanical temperature deteriorate means so as to carry out highly accurate de-ice operation control.
  • the relay used as the operation detection means for the outdoor fan and provided in the indoor unit detects the operation condition of the outdoor fan.
  • the determination means confirms that the outdoor fan is in the OFF state
  • the frost detection signal from the mechanical temperature detection means provided in the outdoor unit is ignored so as to disable the de-ice operation control.
  • This operation is adopted so as to extend the heating operation time period as long as possible in consideration of the case wherein outdoor fan control has been performed to prevent the compressor pressure from rising high.
  • the split type air conditioner of the present invention ignores the frost detection signal from the mechanical temperature detection means so as to appropriately set the start time of the de-ice operation.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
EP96116437A 1995-10-17 1996-10-14 Klimaanlage mit aufgeteilten Geräten Expired - Lifetime EP0789201B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP268207/95 1995-10-17
JP7268207A JPH09113075A (ja) 1995-10-17 1995-10-17 内外分離型空気調和装置
JP26820795 1995-10-17

Publications (3)

Publication Number Publication Date
EP0789201A2 true EP0789201A2 (de) 1997-08-13
EP0789201A3 EP0789201A3 (de) 2000-01-19
EP0789201B1 EP0789201B1 (de) 2002-08-28

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EP96116437A Expired - Lifetime EP0789201B1 (de) 1995-10-17 1996-10-14 Klimaanlage mit aufgeteilten Geräten

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Publication number Priority date Publication date Assignee Title
WO2016110871A2 (en) 2015-01-08 2016-07-14 Bry Air [Asia] Pvt. Ltd. Split level sorption refrigeration system

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JP3815463B2 (ja) * 2003-08-27 2006-08-30 松下電器産業株式会社 分離型空気調和機
JP2009085563A (ja) * 2007-10-03 2009-04-23 Panasonic Corp 空気調和機
CN108679782B (zh) * 2018-05-07 2020-09-04 广东美的暖通设备有限公司 空调化霜控制方法及其装置
CN110631186B (zh) * 2018-06-25 2021-07-23 重庆海尔空调器有限公司 一种空调的除霜控制方法及装置
CN110926093B (zh) * 2019-12-06 2021-07-23 四方科技集团股份有限公司 一种用于冷风机的按需融霜方法

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JPS6017976B2 (ja) * 1981-03-24 1985-05-08 シャープ株式会社 空気調和機
JPS5946439A (ja) * 1982-09-08 1984-03-15 Toshiba Corp スプリツトエアコンの制御信号回路
JPH07190458A (ja) * 1993-12-28 1995-07-28 Matsushita Electric Ind Co Ltd 内外分離型空気調和装置
JP3680336B2 (ja) * 1995-01-27 2005-08-10 松下電器産業株式会社 内外分離型空気調和装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016110871A2 (en) 2015-01-08 2016-07-14 Bry Air [Asia] Pvt. Ltd. Split level sorption refrigeration system
EP4306858A2 (de) 2015-01-08 2024-01-17 Bry-Air (Asia) Pvt. Ltd. Sorptionskälteanlage mit aufgeteilter ebene
US12276445B2 (en) 2015-01-08 2025-04-15 Bry-Air [Asia] Pvt. Ltd. Split level sorption refrigeration system

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JPH09113075A (ja) 1997-05-02
ES2182936T3 (es) 2003-03-16
EP0789201B1 (de) 2002-08-28
EP0789201A3 (de) 2000-01-19
CN1090736C (zh) 2002-09-11
CN1156809A (zh) 1997-08-13
MY117758A (en) 2004-08-30

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