GB2372312A - A method for controlling an air conditioner - Google Patents
A method for controlling an air conditioner Download PDFInfo
- Publication number
- GB2372312A GB2372312A GB0118232A GB0118232A GB2372312A GB 2372312 A GB2372312 A GB 2372312A GB 0118232 A GB0118232 A GB 0118232A GB 0118232 A GB0118232 A GB 0118232A GB 2372312 A GB2372312 A GB 2372312A
- Authority
- GB
- United Kingdom
- Prior art keywords
- damper
- air
- return air
- outdoor air
- outdoor
- 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
Links
Classifications
-
- 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
- F24F1/02—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing
- F24F1/022—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing comprising a compressor cycle
- F24F1/027—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing comprising a compressor cycle mounted in wall openings, e.g. in windows
-
- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/76—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by means responsive to temperature, e.g. bimetal springs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
Abstract
An air conditioner comprising at least one compressor 12a,b, an evaporator 21, outdoor air intake damper 30, return air damper 28 and a duct 27 for providing the room with air, uses a subtraction value that is obtained by subtracting an outdoor air temperature from a set room temperature. If this value is greater than a certain set value, the opening degree of the outdoor air intake damper 30 and the opening degree of the return air damper 28 are controlled at certain time intervals without actuating the compressors 12a,b carrying out a cooling control.
Description
AIR CONDITIONER AND METHOD FOR CONTROLLING IT The present invention relates to an air conditioner, which carries out an air conditioning control, or a socalled economizer operation, wherein temperatures, such as a return air temperature, a supply air temperature and an outdoor air temperature are detected, and the opening degrees of an outdoor air damper and a return air damper are controlled in response to the detected temperatures.
A conventional economizer control has been disclosed in, e. g. , JP-U-264841.
In the conventional economizer control, return air is upwardly supplied through a return air damper in a bottom portion of a unit, ambient air is supplied through an economizer damper in a lateral side of the unit, these two air flows are mixed in a section where an air temperature is detected by a mixed air thermostat, the mixed air flows to an indoor fan through between the portions of a coiled pipe of an indoor heat exchanger, and the mixed air is downwardly supplied, as air
conditioned supply air, to an area to air-condition, through a bottom portion of the unit.
However, the conventional economizer control has created a problem in that the arrangement, wherein the setting of the opening degrees of both dampers is modified at a fixed time, lacks in a follow-up property to load fluctuations after having initially set functions, a compressor is caused to be frequently driven, and an energy saving effect can not be offered in a sufficient manner.
It would be desirable to be able to solve the problem and to provide an-air conditioner and a method for controlling an air conditioner capable of detecting a return air temperature and controlling the opening degrees of an outdoor air intake damper and a return air damper in response to the detected temperature to lengthen an economizer operating time, increasing an energy saving effect.
The present invention provides an air conditioner comprising a compressor, an evaporator, an outdoor air intake damper for taking in outdoor air, a return air damper for taking in indoor air, a duct for providing a room with air passed through the evaporator, and a controller for controlling operations of the compressor, the outdoor air intake damper and the return air damper, wherein if a subtraction value that is obtained by subtracting an outdoor air temperature from a set room
temperature is greater than a certain set value, the controller controls an opening degree of the outdoor air intake damper and an opening degree of the return air damper at certain time intervals without actuating the compressor.
The controller may control the outdoor air intake damper and the return air damper so as to keep a sum of the opening degrees of both dampers constant.
The certain set value may be 10oC.
The present invention also provides a method for controlling an air conditioner comprising a compressor, an evaporator, an outdoor air intake damper for taking in outdoor air, a return air damper for taking in indoor air, a duct for providing a room with air passed through the evaporator, and a controller for controlling operations of the compressor, the outdoor air intake damper and the return air damper; which comprises a first step for determining whether a first subtraction value that is obtained by subtracting an outdoor air temperature from a set room temperature is greater than a first set value, if a temperature of return air taken in though the return air damper is higher than the set room temperature; a second step for opening the outdoor air intake damper and opening the return air damper without actuating the compressor, if it is determined at the first step that the subtraction value is greater than the first set value; and a third step for increasing an opening degree
of the outdoor air intake damper and decreasing an opening degree of the return air damper, if a current return air temperature is higher than the latest return air temperature before lapse of a certain period of time at a time after lapse of the certain period of time, and for decreasing the opening degree of the outdoor air intake damper and increasing the opening degree of the return air damper, if the current return air temperature is not higher than the latest return air temperature before lapse of the certain period of time at the time after lapse of the certain period of time.
The method may further comprise a fourth step for fully opening the outdoor air intake damper and completely closing the return air damper, if it is determined at the first step that the first subtraction value is not greater than the certain set value; and a fifth step for actuating the compressor, if a second subtraction value that is obtained by subtracting the set room temperature from the current return air temperature is greater than a second set value, and for stopping the compressor, if the second subtraction value is not greater than the second set value.
In the method, the sum of the opening degree of the outdoor air damper and the opening degree of the return air damper may be constant.
As explained, in accordance with the present invention, the operation wherein the outdoor air intake
damper and the return air damper are finely controlled without driving the compressor or the operation wherein the compressor is driven can be finely controlled in response to an outdoor air temperature to extremely increase an energy saving effect.
The control can be optimized by using a temperature difference of about 10 C between a set room temperature and an outdoor air temperature as a measure in determining whether the compressor is required to be driven.
In the drawings:
Fig. 1 is a schematic view showing the structure of a rooftop air conditioner according to a first embodiment;
Fig. 2 is a schematic circuit diagram;
Fig. 3 is a flowchart showing the operation of the rooftop air conditioner according to the first embodiment;
Fig. 4 is a graph showing the relationship between an outdoor air temperature and an outdoor air intake ratio;
Fig. 5 is a schematic view showing the relationship between an outdoor air temperature and first and second compressors; and
Fig. 6 is a flowchart showing the operation of a rooftop air conditioner according to a second embodiment.
EMBODIMENT 1 Fig. 1 is a schematic view showing the structure of a rooftop air conditioner according to a first embodiment.
Referring to this figure, the rooftop air conditioner 1 has the interior divided into an outdoor side 10 and an indoor side 20 by a central partition 2.
The outdoor side 10 includes an outdoor heat exchanger 11, a first compressor 12a, a second compressor 12b, an outdoor fan motor 13 and an outdoor fan 14 driven by the outdoor fan motor 13.
On the other hand, the indoor side 20 includes an evaporator 21, an indoor fan motor 22, a motor pulley 23 fixed so as to have a common rotary shaft with the indoor fan motor 22, an indoor blower 24, a blower pulley 25 fixed so as to have a common rotary shaft with the indoor blower 24, a belt 26 entrained about both of the motor pulley 23 and the blower pulley 25, a duct box 27 for supplying a room to air-condition with the air passed through the evaporator 21, a return air damper 28 provided at a lower portion to take in return air from the room, a return air damper drive 29 for driving the return air damper 28, an outdoor air intake damper 30 provided a lateral portion to take in outdoor air, an outdoor air intake damper drive 31 for driving the outdoor air intake damper 30, and hood 32 for protect against rain. Additionally, the rooftop air conditioner 1 includes a controller for carrying out the operation controls of the entire devices, which is connected,
through a cable, to a parameter input device (not shown) provided in the room. A user can set a room temperature or the outlet direction of supply air through the parameter input device.
When both of the return air damper 28 and the outdoor air intake damper 30 are opened in the rooftop air conditioner 1 thus constructed, return air (indicated by"Return air"in Fig. 1) is supplied from the room into the indoor side 20 through the return air damper 28, and outdoor air (indicated by"Fresh air"in Fig. 1) is supplied into the indoor side 20 through the outdoor air intake damper 30. The return air and the outdoor air are mixed, and the mixed air passes through the evaporator 21, flows into the indoor blower 24 and is supplied as supply air (indicated by"Supply air"in Fig. 1) into the room through the duct box 27.
Next, the controller for carrying out the entire control of the rooftop air conditioner 1 will be described, referring to the circuit diagram of Fig. 2.
In Fig. 2, reference numeral 50 designates a microcomputer board with a microcomputer mounted thereon as the controller.
The microcomputer board 50 includes an outdoor air temperature detection thermister 51 for detecting an outdoor air temperature (Tout), a return air temperature detection thermister 52 for detecting a return air temperature (TO, Tl) and a supply air temperature
detection thermister 53 for detecting a supply air temperature (T2).
Additionally, the microcomputer board 50 has a resistor 54, which is connected to terminals of an outdoor air intake damper driving motor 31a provided in the outdoor air intake damper drive 31 and terminals of a return air damper driving motor 29a provided in the return air damper drive 29. The return air damper driving motor 29a receives an inverted signal with respect to the outdoor air intake damper driving motor 31a. In detail, the resistor 54 has a terminal A at one end connected to one of the terminals of the outdoor air intake damper driving motor 31a, a terminal C at the other end connected to one of the terminals of the return air damper driving motor 29a and a laterally slidable terminal B at an intermediate position connected to the other terminal of the outdoor air intake damper driving motor 31a and the other terminal of the return air damper driving motor 29a. The microcomputer controls the position of the terminal B based on an outdoor air temperature, a return air temperature and a supply air temperature.
If the value of the resistivity between the
terminals A and B is RI, if the value of the resistivity between the terminals B and C is R2 and if the value of the resistivity between the terminals A and C is R, the following equation is established:
R=Rl+R2 The opening degrees of the dampers are proportional to the values of the resistivity R1 and R2.
Specifically, when the terminal B is slid and set at a position with the equations of R1=R and R2=0 established, the outdoor air intake damper driving motor 31a sets the opening degree of the outdoor air intake damper 30 at 100%, and the return air damper driving motor 29a sets the opening degree of the return air damper 28 at 0%. When the terminal B is slid and set at a position with the equations of RI=0. 3R and R2=0.7R established, the outdoor air damper driving motor 31a sets the opening degree of the outdoor air intake damper 30 at 30%, and the return air damper driving motor 29a sets the opening degree of the return air damper 28 at 70%.
Additionally, the microcomputer board 50 includes an indoor fan motor electromagnetic contactor relay 55 for activating an indoor fan motor electromagnetic contactor 60, a first compressor electromagnetic contactor relay 56 for actuating a first compressor electromagnetic contactor 61, and a second compressor electromagnetic contactor relay 57 for actuating a second compressor electromagnetic contactor 62.
Reference numeral 58 designates a start switch of the rooftop air conditioner 1, and reference numeral 59 designates a transformer.
Now, the operation of the rooftop air conditioner 1 having the structure shown in Figs. 1 and 2 will be explained in reference to the flowchart of Fig. 3.
First, when the start switch 58 turns on, the indoor fan motor electromagnetic contactor relay 55 is energized, normally-open pair of contacts are closed to turn on the indoor fan motor electromagnetic contactor 60, and the indoor blower 24 rotates (Step (hereinbelow, referred to as"S") 1).
Next, an identifier A is set at 0, the equations of R1=0 and R2=R are established, completely closing the outdoor air damper 30 and fully opening the return air damper 28 (S2).
Next, it is determined whether a current return air temperature Tl is higher than a set room temperature Ts or not (S3).
If it is determined at S3 that the current return air temperature T1 is not higher than the set room temperature Ts, the first compressor 12a and the second compressor 12b are turned off, the outdoor air intake damper 30 is completely closed, and the return air damper 28 is fully opened since cooling is not needed (S4).
If it is determined at S3 that the current return air temperature T1 is higher than the set room temperature Ts, it is determined whether the difference between the set room temperature Ts and an outdoor air temperature Tout is not greater than 0, between 0 and 10,
or not smaller than 10 (S5). If the difference between the set room temperature Ts and the outdoor air temperature Tout is greater than 0, outdoor air can be utilized to improve cooling efficiency.
If it is determined at S5 that the difference between the set room temperature Ts and the outdoor air temperature Tout is not smaller than 10, it is determined whether the identifier A is 0 or not (S6). If in the affirmative, the outdoor air temperature Tout and the
current return air temperature T1 are detected, and the value of the resistivity R1 for the outdoor air intake damper driving motor 31a and the value of the resistivity
R2 for the outdoor air intake damper driving motor 29a are controlled so that the difference between the return
air temperature Tl and a supply air temperature (the temperature of"Supply air"in Fig. 1 : T2) reaches to 10 C (S7), which correspond to 100% of required cooling capacity.
Based on the values of the resistivity R1 and R2, the opening degrees f (Xo) and g (Xo) of both dampers are determined, and the return air damper 28 and the outdoor air intake damper 30 are opened accordingly (S8). If it is determined at S6 that the identifier is not 0 but 1,
Step 7 and Step 8 are skipped since the opening degrees of the return air damper 28 and the outdoor air intake damper 30 have been already controlled.
Next, when it is confirmed that 5 minutes have
passed (S9), a current return air temperature (tel) is detected, and it is determined whether the difference between the detected current return air temperature and the latest return air temperature TO 5 minutes before is greater than 0 or not (S10). If it is determined at S10 that the difference is greater than 0, the opening degree of the outdoor air intake damper 30 is increased by AX, and the opening degree of the return air damper 28 is decreased by AX (S11) since the determination means that the return air temperature has risen than 5 minutes before, and that cooled air is in short supply.
Next, it is determined whether the difference between the set room temperature Ts and the current return air temperature T1 is smaller than laC or not (S12). If it is determined that the difference is
smaller than 1 C, it is determined again at S14 whether the difference between the set room temperature Ts and a current return air temperature T1 is smaller than 1 C after it is confirmed at S13 that 5 minutes have passed.
If it is determined at S14 that the difference is still smaller than 1 C, the processing returns to S13. Thus, the room can be maintained at a temperature close to the set room temperature.
If it is determined at S12 or S14 that the difference is not smaller than laC, the identifier A is set at 1 (S15), and the processing returns to S3.
If it is determined at S10 that the difference is
smaller than 0, the opening degree of the outdoor air intake damper 30 is decreased by AX, and the opening degree of the return air damper 28 is increased by AX (S16) since the determination means that the return air temperature has dropped than 5 minutes before, and that cooling air is in excessive supply.
Next, it is determined whether the difference between the set room temperature Ts and a current return air temperature Tl is smaller than 1 C or not (S17). If it is determined that the difference is smaller than 1 C, it is determined again at S19 whether the difference between the set room temperature Ts and a current return air temperature T1 is smaller than 1 C or not after it is confirmed at S18 that 5 minutes have passed. If it is
determined that the difference is still smaller than 1 C, the processing returns to S18.
If it is determined at S17 or S19 that the difference is not smaller than 1 C, the identifier A is set at 1 (S15), and the processing returns to S3.
If it is determined at S5 that the difference between the set room temperature Ts and the outdoor air temperature Tout is between 0 and 10, the outdoor air intake damper 30 is fully opened, and the return air damper 28 is completely closed (S20). Next, it is
determined whether the current return air temperature T1 is greater than the value that is obtained by adding 2 C to the set room temperature Ts (S21). If in the
affirmative, the first compressor 12A is actuated, regarding the utilization of only outdoor air as being insufficient for cooling (S22). If it is determined at
S21 that the current return air temperature is not greater than that value, the first compressor 12a is stopped, regarding the utilization of only outdoor air as being sufficient for cooling (S23).
If it is determined at S5 that the difference between the set room temperature Ts and the outdoor air temperature Tout is not greater than 0, the outdoor air damper is completely closed, the return air damper is fully opened (S24), and the second compressor 12b is actuated (S25). Then, it is determined whether the
current return air temperature T1 is greater than the value that is obtained by adding 2 C to the set room temperature Ts (S26). If in the affirmative, the first compressor 12a is actuated, regarding the actuation of only the second compressor 12b as being insufficient for cooling (S27).
When the step at S4, S22, S23 or S27 is completed, or if it is determined at S26 that the current return air temperature is not greater than that value, the identified A is set at 0 (S28), and the processing returns to S3.
Now, in order to explain an example according to the flowchart of Fig. 3, the relationship between an outdoor air intake rate and an outdoor air temperature are shown
in Fig. 4, and the relationship between the actuations of the first and second compressors and an outdoor air temperature is shown in Fig. 5.
In this case, the set room temperature is 25OC.
If the outdoor air temperature is not higher than
15OC, the processing at S6 and the subsequent steps are executed to carry out cooling by finely controlling the opening degrees of the outdoor air intake damper 30 and the return air damper 28 to follow loads without actuating the first compressor 12a or the second compressor 12b.
If the outdoor air temperature is between 15 C and 25OC, the processing at S20 and the subsequent steps is executed to fully open the outdoor air intake damper 30 and actuate the first compressor depending on loads.
If the outdoor air temperature is higher than 25OC, the processing at S24 and the subsequent steps is executed to completely close the outdoor air intake damper 30, fully open the return air damper 28, actuate the second compressor 12b, and actuate the first compressor depending on loads.
As explained, in this embodiment, if the outdoor air temperature is extremely lower than the set room temperature, the outdoor air intake damper and the return air damper are finely controlled without the compressors being actuated. If the difference between the outdoor air temperature and the set room temperature is not so
great, a close control, such as actuation of a compressor, is carried out. Thus, the energy saving effect can be remarkably improved.
In addition, the control can be optimized by using a temperature difference of about 10 C between the outdoor air temperature and the set room temperature in determining whether the compressors are activated or not.
Although the outdoor air intake damper 30 is completely closed, and the return air damper 28 is fully opened at S24 in this embodiment, the processing is not limited to this mode. The opening degree of the outdoor intake damper 30 may be configured to be minimized at this step.
EMBODIMENT 2
Although the two compressors are used in the first embodiment, even the provision of a single compressor can be offer a similar effect.
Fig. 6 is flowchart showing the operation of a rooftop air conditioner in the case of a single compressor. Explanation of the structure of the rooftop air conditioner will be omitted since the structure is different from the structure of the rooftop air conditioner shown in Fig. 1 only in that a single compressor is provided.
The flowchart of Fig. 6 is different from the one of
Fig. 3 only in that the processing is different if it is determined at S5 that the difference between a set room
temperature Ts and an outdoor air temperature Tout is smaller than 10.
If it is determined that the difference between the set room temperature Ts and the outdoor air temperature
Tout is between 0 and 10, the outdoor air intake damper 30 is fully opened, and the return air damper 28 is completely closed (S20). Next, it is determined whether
a current return air temperature Tl is higher than the value that is obtained by adding 2 C to the set room temperature Ts (S21). If in the affirmative, the compressor is actuated, regarding the utilization of only outdoor air as being insufficient for cooling (S30). If it is determined at S21 that the current return air temperature is not higher than that value, the compressor is stopped, regarding the utilization of only outdoor air as being sufficient for cooling (S31).
If it is determined at S5 that the difference between the set room temperature Ts and the outdoor air temperature Tout is not greater than 0, the outdoor air intake damper 30 is completely closed, the return air damper 28 is fully opened (S24), and the compressor is actuated (S32).
Thus, even in the case of the single compressor, the energy saving effect can be remarkably improved as in the first embodiment.
Claims (7)
- CLAIMS : 1. An air conditioner comprising: a compressor; an evaporator; an outdoor air intake damper for taking in outdoor air; a return air damper for taking in indoor air; a duct for providing a room with air passed through the evaporator; and a controller for controlling operations of the compressor, the outdoor air intake damper and the return air damper; wherein if a subtraction value that is obtained by subtracting an outdoor air temperature from a set room temperature is greater than a certain set value, the controller controls an opening degree of the outdoor air intake damper and an opening degree of the return air damper at certain time intervals without actuating the compressor.
- 2. The air conditioner according to Claim 1, wherein the controller controls the outdoor air intake damper and the return air damper so as to keep a sum of the opening degrees of both dampers constant
- 3. The air conditioner according to Claim 1 or 2, wherein the certain set value is 10oC.
- 4. A method for controlling an air conditioner comprising a compressor, an evaporator, an outdoor airintake damper for taking in outdoor air, a return air damper for taking in indoor air, a duct for providing a room with air passed through the evaporator, and a controller for controlling operations of the compressor, the outdoor air intake damper and the return air damper; which comprises: a first step for determining whether a first subtraction value that is obtained by subtracting an outdoor air temperature from a set room temperature is greater than a first set value, if a temperature of return air taken in though the return air damper is higher than the set room temperature; a second step for opening the outdoor air intake damper and opening the return air damper without actuating the compressor, if it is determined at the first step that the subtraction value is greater than the first set value; and a third step for increasing an opening degree of the outdoor air intake damper and decreasing an opening degree of the return air damper, if a current return air temperature is higher than the latest return air temperature before lapse of a certain period of time at a time after lapse of the certain period of time, and for decreasing the opening degree of the outdoor air intake damper and increasing the opening degree of the return air damper, if the current return air temperature is not higher than the latest return air temperature before. apse of the certain period of time at the time after lapse of the certain period of time.
- 5. The method according to Claim 4, further comprising: a fourth step for fully opening the outdoor air intake damper and completely closing the return air damper, if it is determined at the first step that the first subtraction value is not greater than the certain set value; and a fifth step for actuating the compressor if a second subtraction value that is obtained by subtracting the set room temperature from the current return air temperature is greater than a second set value, and for stopping the compressor, if the second subtraction value is not greater than the second set value.
- 6. The method according to Claim 4 or 5, wherein a sum of the opening degree of the outdoor air damper and the opening degree of the return air damper is constant.
- 7. An air conditioner substantially as described with reference to, and as shown in, Figures 1 to 5 or Figure 6 of the accompanying drawings.S. A method for controlling an air conditioner, substantially as described with reference to Figures 1 to 5 or Figure 6 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001043379A JP4479111B2 (en) | 2001-02-20 | 2001-02-20 | Air conditioner and control method of air conditioner |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0118232D0 GB0118232D0 (en) | 2001-09-19 |
| GB2372312A true GB2372312A (en) | 2002-08-21 |
| GB2372312B GB2372312B (en) | 2002-12-31 |
Family
ID=18905551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0118232A Expired - Fee Related GB2372312B (en) | 2001-02-20 | 2001-07-26 | A method of controlling an air conditioner |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP4479111B2 (en) |
| AU (1) | AU780092B2 (en) |
| ES (1) | ES2180457B1 (en) |
| GB (1) | GB2372312B (en) |
| MY (1) | MY124872A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3640112B1 (en) | 2017-06-12 | 2021-11-17 | Mitsubishi Electric Corporation | Vehicular air-conditioning apparatus and air-conditioning method of vehicular air-conditioning apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011137597A (en) * | 2009-12-28 | 2011-07-14 | Hitachi Appliances Inc | Air conditioning device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5544697A (en) * | 1983-09-02 | 1996-08-13 | Carrier Corporation | Differential temperature control |
| US5829674A (en) * | 1997-05-02 | 1998-11-03 | Carrier Corporation | Zone system control |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07332737A (en) * | 1994-06-10 | 1995-12-22 | Kubota Corp | Air conditioning installation |
| JP3575118B2 (en) * | 1995-06-27 | 2004-10-13 | 松下電工株式会社 | Air conditioning control device |
| JPH10318593A (en) * | 1997-05-19 | 1998-12-04 | Mitsubishi Electric Corp | Control method for air-conditioning device and air-conditioning device |
| JP3334073B2 (en) * | 1998-01-29 | 2002-10-15 | 株式会社山武 | Outside air cooling air conditioning control system and air conditioning control device |
| JP3278821B2 (en) * | 1998-06-03 | 2002-04-30 | 株式会社山武 | Air conditioning control system |
-
2001
- 2001-02-20 JP JP2001043379A patent/JP4479111B2/en not_active Expired - Fee Related
- 2001-07-26 GB GB0118232A patent/GB2372312B/en not_active Expired - Fee Related
- 2001-07-31 MY MYPI20013608 patent/MY124872A/en unknown
- 2001-08-17 ES ES200101915A patent/ES2180457B1/en not_active Expired - Fee Related
- 2001-08-24 AU AU65443/01A patent/AU780092B2/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5544697A (en) * | 1983-09-02 | 1996-08-13 | Carrier Corporation | Differential temperature control |
| US5829674A (en) * | 1997-05-02 | 1998-11-03 | Carrier Corporation | Zone system control |
Non-Patent Citations (1)
| Title |
|---|
| JAPIO ABSTRACT OF JP60221650A * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3640112B1 (en) | 2017-06-12 | 2021-11-17 | Mitsubishi Electric Corporation | Vehicular air-conditioning apparatus and air-conditioning method of vehicular air-conditioning apparatus |
| US11299011B2 (en) | 2017-06-12 | 2022-04-12 | Mitsubishi Electric Corporation | Vehicular air-conditioning apparatus and air-conditioning method of vehicular air-conditioning apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0118232D0 (en) | 2001-09-19 |
| AU6544301A (en) | 2002-08-22 |
| MY124872A (en) | 2006-07-31 |
| ES2180457B1 (en) | 2004-03-16 |
| GB2372312B (en) | 2002-12-31 |
| JP2002243242A (en) | 2002-08-28 |
| AU780092B2 (en) | 2005-03-03 |
| ES2180457A1 (en) | 2003-02-01 |
| JP4479111B2 (en) | 2010-06-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 746 | Register noted 'licences of right' (sect. 46/1977) |
Effective date: 20051103 |
|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20160726 |