CN1072350C - Control method for removing frost from inverter-type air conditioner - Google Patents
Control method for removing frost from inverter-type air conditioner Download PDFInfo
- Publication number
- CN1072350C CN1072350C CN92114987A CN92114987A CN1072350C CN 1072350 C CN1072350 C CN 1072350C CN 92114987 A CN92114987 A CN 92114987A CN 92114987 A CN92114987 A CN 92114987A CN 1072350 C CN1072350 C CN 1072350C
- Authority
- CN
- China
- Prior art keywords
- defrosting
- temperature
- yard piping
- inverter
- running
- 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.)
- Expired - Fee Related
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
- F25D21/006—Defroster control with electronic control circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/025—Motor control arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
A procedure is provided for defrosting an inverter-driven air conditioning unit where the rime on the outdoor heat exchanger is melted off. First, it is determined whether the temperature measured by a sensor on an outdoor duct is appropriate for the initiation of defrosting and then a four way valve is adjusted to block the flow of cooling medium so that the defrost cycle can commence. Next, the defrost condition is evaluated and the compressor drive frequency and heating element phase are changed so that the defrosting takes a preset time dependent on the measured temperature. The defrosting process is then monitored continuously with adjustments in these two parameters if necessary. ADVANTAGE - Defrost time determined by measured temperature of outdoor duct.
Description
The present invention relates to inverter-type air conditioner, be particularly related to the defrosting control method of inverter-type air conditioner, this method, because along with the yard piping variations in temperature can be controlled compressor and heater changeably, shortened the defrosting time of removing frosting on the outdoor heat converter, can often remain on the heating efficient of certain space more than the certain level.
Usually, the dual-purpose inverter-type air conditioner of refrigeration heating (as: separate type heat pump (changes in temperature) type inverter-type air conditioner) when being used for heating, cross valve makes refrigerant circulate according to the order of compressor → storage heater → indoor heat converter → expansion gear → outdoor heat converter → cross valve → compressor.And when refrigeration, cross valve control refrigerant circulates according to the order of compressor → cross valve → outdoor heat converter → expansion gear → indoor heat converter → storage heater → compressor.
Fig. 1 represents to have the compressor drive circuit in the inverter-type air conditioner of above-mentioned refrigeration heating circulation.That is, when commercial ac voltage 1 was input to the drive circuit of compressor 4, rectifier 2 became DC voltage to commercial ac voltage 1.For with inverter 3 drive compression machine 3 actions once more, will become the DC voltage inverse transformation after the above-mentioned conversion alternating voltage to come drive compression machine 4 again.
The driver 6 of control device 5 control transistor bases so that control the action of above-mentioned inverter 3, thereby can change the output frequency of inverter 3.At this moment, control device 5 is controlled transistor base driver 6 according to the yard piping temperature of outdoor temperature sensor 7 and 8 perception of yard piping temperature sensor, makes the operating frequency of compressor 4 rise and descend, thus control heating or refrigeration running.
Here, not elsewhere specified label α is the heater control module, and it is wound on the yard piping of indoor heat converter and storage heater, is used for controlling the caloric value of heat energy being fallen the heater on refrigerant.
, when carrying out the heating running at the appointed time, the ventilating fan outwards cold air of discharging makes frosting on the outdoor heat exchanger, and in order to remove these frosts, running must defrost.In a word, as shown in Figure 2, carry out certain hour t
1Heating running, certain hour t
2Defrosting running after, carry out certain hour t again
1Heating operation.
As mentioned above, during the heating running,, carry out Defrost operation during heating at any time in order to remove the frosting on the outdoor heat converter.Here, as long as the control cross valve moves refrigerant cycle and refrigerant cycles together, running just can defrost.
; the temperature of outdoor temperature and yard piping is not considered in defrosting running originally, only carries out according to fixing control model in specified time limit, and problem is at the appointed time; even surpassed the time of actual defrosting, the yard piping temperature rise time (defrosting time) can not shorten.That is to say that as shown in Figure 2, the temperature (as 12 ℃) of the yard piping temperature of defrosting running zero-time being brought up to regulation will spend long-time t
2In addition, even, also frosting is not eliminated, because frosting is still arranged on the outdoor heat converter to after the stipulated time, the defrosting running finished, cause heat exchanger effectiveness to descend, heating efficient must reduce, thereby causes power consumption to increase, even, not only can freeze phenomenon by the generation chamber outer heat-exchanger, nor the environment of possibility Creating Comfort.
Therefore, for solving above-mentioned variety of problems, inverter type air conditioner defrosting control method of the present invention has been proposed, the purpose of this invention is to provide a kind of inverter-type air conditioner, its control device is judged best defrosting time according to the yard piping temperature, in the best defrosting time of judging, the frosting on the outdoor heat converter is removed fully, thereby shortened defrosting time.
For achieving the above object, in the inverter-type air conditioner of the defrosting of the frosting of removing outdoor heat converter running (refrigeration running), feature according to defrosting control method of the present invention is: the first step is the yard piping temperature of judging by the perception of yard piping temperature sensor, when satisfying the condition of the running that defrosts, the control cross valve, so that change the flow direction of refrigerant, running defrosts; Second step was to judge present defrost state, so that defrost in official hour, judged then whether the phase angle of heater of the operating frequency of compressor can change; The 3rd step was the judged result according to second step, the operating frequency of control compressor and the phase angle of heater, and running defrosts.
Fig. 1 is the compressor drive circuit of common inverter-type air conditioner.
Fig. 2 is the movement state diagram of existing inverter-type air conditioner.
Fig. 3 A is the defrosting control method flow chart of inverter-type air conditioner of the present invention.
Fig. 3 B is the detail flowchart of defrosting control program on Fig. 3 A.
Fig. 3 C is the flow chart of compressor operation frequency programs among Fig. 3 A.
Fig. 4 A is a yard piping variation of temperature rate flow chart of the present invention.
Fig. 4 B is the performance plot of expression yard piping rate of temperature change and heater phase angle relationship.
Fig. 4 C is the performance plot of the compressor operation frequency relation of expression yard piping rate of temperature change.
According to the defrosting control method of inverter-type air conditioner of the present invention is to have white control method on the outdoor heat converter in order to remove in during official hour after the heating running, and Fig. 3 A represents to carry out the flow chart of this method.
With reference to Fig. 3 A, in a single day start according to inverter-type air conditioner of the present invention, in the S1 step control device 5 is restPosed earlier.In S2 step, will convert numerical data to the analog/digital converters that are installed in the control device 5 by yard piping temperature sensor 8 sensings and the sensing temperature that is input to control device 5, judge at that time yard piping temperature T is what and spends.Go on foot at S3 then, when the yard piping temperature T of being judged by S2 step reached the condition that defrosts, the control cross valve made refrigerant circulate according to the order of compressor → cross valve → outdoor heat converter → expansion gear → indoor heat converter → storage heater → compressor.So inverter-type air conditioner forms kind of refrigeration cycle, carry out the S40 defrosting control program in step, remove the frosting on the outdoor heat converter.
Shown in Fig. 3 B, judge whether to be in the defrost process at S41, if defrost, enter the S42 step, judge whether the defrosting running restores.That is, whether the yard piping temperature T of judging the yard piping temperature sensor senses has reached more than the set point of temperature (for example 12 ℃).If the result that the S42 step is judged is that the yard piping temperature T does not reach more than the temperature of regulation, i.e. under the non-restoring situation of defrosting running, enter the S43 step, calculate initial temperature rate of change Y1.
At this moment, a reference value at desired compression machine operating frequency and heater phase angle when rate of temperature change Y has become decision defrosting running, this rate of change is obtained by following formula
In other words, shown in Fig. 4 A, for the yard piping temperature T from defrosting running time started t
0The yard piping temperature T
0Reach the releasing defrosting time T that frosting is eliminated
1The time temperature T
1, just must keep the rate of temperature change Y that obtains by (1) formula.
Therefore, can know can be at official hour (△ t=T when how big the rate of change of the input temp T of yard piping temperature sensor 8 perception be for control device 5
1-T
0) in make temperature reach the temperature T that can eliminate the frosting on the outdoor heat converter fully
1In other words, controller 5 can not be at official hour (△ T=t as keeping defrosting running from the rate of temperature change Y that (1) formula is obtained
1-t
0) in reach the temperature T that frost is eliminated
1
So, suppose by yard piping temperature sensor 8 sensings and at defrosting running time started T
0Be input to the yard piping temperature T of controller 5
0Be-12 ℃, defrosting fortune releasing time yard piping temperature T
1It is 12 ℃.Can be by (1) formula decision initial temperature rate of change Y
1 
If get above-mentioned defrosting (the △ t=t duration of runs
1-t
0) be 3 minutes, rate of temperature change Y
1Then be:
Per minute improves 8 ℃ to the yard piping temperature T in other words, just can eliminate frosting through 3 minutes.
In this way, be 4 minutes the duration of runs if regulation defrosts, and rate of temperature change has just become 6 ℃/minute, as per minute the temperature of yard piping is improved 6 ℃, then can not eliminate frost in 4 minutes.
According to above-mentioned method, as long as obtain initial rate of temperature change Y
1, control device 5 is just controlled the phase angle of the operating frequency and the heater of compressor, and yard piping rate of temperature change γ just becomes the rate of temperature change Y that obtains at first
1That is: the phase place of heater is according to controlling with the rate of temperature change Y shown in (1) formula with being directly proportional, and the operating frequency of compressor 4 is according to controlling inversely with the rate of temperature change shown in (1) formula.
Below with reference to Fig. 4 B, the phase angle of heater and rate of temperature change Y are inversely proportional to.
On Fig. 4 C, the operating frequency of compressor is directly proportional with rate of temperature change Y.
So as Fig. 4 B, shown in the 4C, if according to heater phase angle X0 and compressor operation Xf driving frequently operation of air conditioner, yard piping rate of temperature change Y just remains the variations in temperature Y that initial calculation is come out so
1
As mentioned above, control device 5 calculates initial temperature rate of change Y in the S43 step
1Afterwards, just carry out the S44 step, calculate current rate of temperature change Yx in the S44 step.
At this moment, after the defrosting action, according to yard piping temperature sensor 8 sensings and be input to the yard piping temperature of controller 5, calculate above-mentioned current rate of temperature change Yx by (1) formula, here, official hour △ T can set arbitrarily.
When calculating current rate of temperature change Yx in the S44 step, control device 5 went on foot the size of the current rate of temperature change Yx that calculates in the S44 step and the above-mentioned variations in temperature Y that calculates in the S43 step in S45 step and S46
1Compare.If presentation of results relatively is initial temperature rate of change Y
1With current rate of temperature change Y
xIdentical, according to the heater phase angle of now and the phase frequency running of compressor, in the time bar of setting, just can reach the yard piping temperature of defined.
Like this, control device 5 goes on foot the state that the corresponding frequencies of heater phase angle and compressor is all remained on initial setting at S47, controls air conditioner.But, if above-mentioned S45 step and S466 step result relatively means that current rate of temperature change Yx is than initial rate of temperature change Y
1, turn round according to heater phase angle and compressor phase frequency at this moment, in the time bar of setting, just can not reach the yard piping of regulation.Be that amplitude during the yard piping temperature improves is little, if, just can not in the time bar of setting, reach the yard piping temperature of regulation only according to the operating frequency Xf operation of basic heater phase angle and compressor.
So, will increase rate of temperature change Y in the S48 step.
In the S40 step rate of temperature change is increased, on Fig. 4 B, the phase angle of heater reduces (caloric value increase), and on Fig. 4 C, the operating frequency of compressor improves (the indoor rate of coagulating that causes increases, and defrosting efficiency improves).
Shown in Fig. 4 B, 4C, in other words, during with the compressor operation frequency drives heater of the heater phase angle that reduces and raising and compressor, improve the yard piping temperature according to the rate of temperature change Y that increases, thereby in the time bar of setting, reach the temperature of regulation.In addition, the comparative result explanation in the step in S45 step and S46 is if current rate of temperature change Yx is greater than initial temperature rate of change Y
1,, before the time bar of setting, just can reach the yard piping temperature of regulation according to the phase frequency running of at this moment heater phase angle and compressor.
That is to say,,, before the time bar of setting, just can reach the yard piping temperature of regulation according to basic heater phase angle and compression operation frequency Xf running owing to make yard piping temperature ascensional range big.So, will reduce rate of temperature change Y in the S49 step.
Shown in Fig. 4 B, reduce the said temperature rate of change, just make the heater phase angle increase (caloric value reduces), shown in Fig. 4 C, and the operating frequency of compressor is descended (indoor freezing capacity descends, and defrosting efficiency descends).
Shown in Fig. 4 B and 4C, this just means that if drive heater and compressor according to phase angle that increases and the operating frequency that reduces, then the yard piping temperature rises according to the rate of temperature change Y that reduces, thereby can reach the temperature of regulation at the time bar of setting.
On the one hand,, restore (end), just remove defrosting running action (the control cross valve changes flowing of circulating cooling agent, carries out heating operation once more) in the S39 step if be judged as defrosting in the S42 step of judging whether the defrosting running restores.
Control program (S40 step) defrost as mentioned above afterwards, and control device 5 is determined program at S50 step operation compressor frequency.
Fig. 3 C is the definite flow chart of compressor frequency of representing above-mentioned steps S50 in more detail, with reference to Fig. 3 C, in the S51 step, judges whether the compressor operation frequency changes.Promptly, judged whether to occur to make the situation of compressor operation frequency change by the result of the defrosting control of carrying out the S40 step in order to change yard piping rate of temperature change Y.
In the S51 judged result in step, if must change the compressor operation frequency, control device 5 carries out the S52 step so.Output a control signal to transistor base driver 6 in the S52 step.Make the action of compressor according to the operating frequency of new settings.The above-mentioned control signal control inverter 3 of transistor base driver 6 usefulness is by pulse amplitude modulation signal (pwm signal) the drive compression machine that has changed.
Like this, changed the operating frequency of compressor.In the desirable time, can be turned round by refrigeration (defrosting running) removes the frost of knot on outdoor heat converter.Then, in S53 step and S54 step, the operating frequency of used now is compared with the spot frequency of abideing by the defrosting condition in the compressor operation, whether they are consistent, comparative result is with current frequency drives compressor, if current frequency ratio spot frequency is low, improve current frequency in the S55 step and make it to reach spot frequency, come the drive compression machine.In addition,, current frequency is reduced, make it consistent, then the drive compression machine with spot frequency in the S56 step if current frequency is higher than the target frequency.
So, owing to adjust the amount of refrigerant of circulation, make temperature reach the temperature of the yard piping of regulation, be optimum value so remove the defrosting time of yard piping frosting.As mentioned above, when changing the compressor operation frequency, the compressor operation frequency of variation simultaneously makes the defrosting condition be met, and defrosting time is shortened.As mentioned above, after S50 step compressor operation frequency determined that program is finished, control device 5 carried out the S6 step.In the above-mentioned S56 step, in holding chamber, determine the rotating speed of the outdoor ventilating fan of outside exhaust under the hot gas efficient state.
Then, in the S7 step, shown in Fig. 3 B, according to being come control heater, adjusted caloric value by the phase angle of defrosting control program adjustment, satisfy the condition that defrosts to greatest extent and while, running defrosts.
According to method of the present invention, flexibly control defrosting time according to the yard piping rate of temperature change, not only save defrosting time, and improved heating efficient, can also save power consumption widely.
In addition, the present invention points out clearly, can implement the scheme of all distortion of the present invention, but all not depart from the scope of the present invention.
Though only described inverter-type air conditioner above, yet both made heating equipment also be suitable for method of the present invention, can obtain same effect for the running that need not defrost.
Claims (5)
1. the defrosting control method of inverter-type air conditioner is characterized in that:
The first step is to defrost in the inverter-type air conditioner of running (refrigeration running) for removing frosting on the outdoor heat converter, when judging the yard piping temperature of yard piping temperature sensor senses and satisfying the predetermined condition of the running that defrosts, the logical valve of controller changes the flow of refrigerant direction and removes running;
Second step was judged current defrost state so that defrost in the time of setting, judge then whether the operating frequency of compressor and the phase angle of heater can change;
The 3rd step was the judgement according to aforementioned second step, the operating frequency of control compressor and the phase angle of heater, and running defrosts.
2. the defrosting control method of inverter-type air conditioner according to claim 1 is characterized in that:
Aforesaid second step comprises sensing yard piping rate of temperature change and judges the defrosting condition judgment step whether defrosting at the appointed time finishes; With the defrosting conditional decision step that determines the defrosting condition according to the judged result of aforementioned defrosting condition judgment step.
3. the defrosting control method of inverter-type air conditioner according to claim 2 is characterized in that:
Defrosting condition judgment step is the yard piping rate of temperature change and the yard piping rate of temperature change that periodically calculates later on, the step of judging again that comparison was calculated in the defrosting running starting stage
4. the defrosting control method of inverter-type air conditioner according to claim 3 is characterized in that:
Yard piping rate of temperature change Y is calculated by following formula:
(in the formula: △ is that t defrosting duration of runs, △ T are current yard piping temperature T
0Yard piping temperature T when finishing with the defrosting running
1Poor).
5. the defrosting control method of inverter-type air conditioner according to claim 2 is characterized in that:
Defrosting action control step is the comparative result according to the yard piping rate of temperature change of initial yard piping rate of temperature change and later defrosting action phase, the operating frequency of decision heater phase angle and compressor.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR24641/91 | 1991-12-27 | ||
| KR91-24641 | 1991-12-27 | ||
| KR1019910024641A KR950000738B1 (en) | 1991-12-27 | 1991-12-27 | Method of controlling frost of invertor air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1073760A CN1073760A (en) | 1993-06-30 |
| CN1072350C true CN1072350C (en) | 2001-10-03 |
Family
ID=19326244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92114987A Expired - Fee Related CN1072350C (en) | 1991-12-27 | 1992-12-26 | Control method for removing frost from inverter-type air conditioner |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2514774B2 (en) |
| KR (1) | KR950000738B1 (en) |
| CN (1) | CN1072350C (en) |
| DE (1) | DE4243634C2 (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3598809B2 (en) * | 1997-08-25 | 2004-12-08 | 三菱電機株式会社 | Refrigeration cycle device |
| KR20050105029A (en) * | 2004-04-30 | 2005-11-03 | 엘지전자 주식회사 | Defrosting driving method for air conditioner |
| JP4836212B2 (en) * | 2009-07-22 | 2011-12-14 | シャープ株式会社 | Air conditioner |
| CN103123194A (en) * | 2012-03-31 | 2013-05-29 | 宁波奥克斯电气有限公司 | Defrosting method of multi-combination type air conditioning unit |
| CN102721115B (en) * | 2012-06-27 | 2014-10-29 | 美的集团股份有限公司 | Air conditioner and control method thereof |
| CN104214885B (en) * | 2013-05-29 | 2016-12-28 | 珠海格力电器股份有限公司 | Air conditioner defrosting control method and device and air conditioner |
| CN105953365B (en) * | 2016-05-16 | 2019-03-29 | 广东美的制冷设备有限公司 | Air conditioner and its defrosting control method |
| CN107588543A (en) * | 2017-11-03 | 2018-01-16 | 邹城市东基新热力管道防腐保温有限公司 | A kind of far infrared heater of wellhead anti-freezing |
| CN109084434B (en) * | 2018-08-29 | 2019-10-18 | 珠海格力电器股份有限公司 | Variable-frequency heat pump air conditioner and defrosting control method thereof |
| DE102018221328A1 (en) * | 2018-12-10 | 2020-06-10 | BSH Hausgeräte GmbH | Refrigeration device and method for initializing a defrosting process in a refrigeration device |
| CN110057029A (en) * | 2019-04-25 | 2019-07-26 | 宁波奥克斯电气股份有限公司 | A kind of air-conditioner defrosting control method, device and air conditioner |
| CN110470025B (en) * | 2019-08-04 | 2021-12-21 | 重庆海尔空调器有限公司 | Control method and device for defrosting of air conditioner and air conditioner |
| CN112283880A (en) * | 2020-09-17 | 2021-01-29 | 珠海格力电器股份有限公司 | Control system and control method for preventing air conditioner from freezing |
| CN112344622B (en) * | 2020-11-06 | 2022-01-28 | 中山市爱美泰电器有限公司 | Intelligent defrosting device of heat pump system and control method thereof |
| CN113074445B (en) * | 2021-03-08 | 2022-09-16 | 海信空调有限公司 | Air conditioner defrosting control method and device, air conditioner and computer readable storage medium |
| CN113091216B (en) * | 2021-04-14 | 2022-08-16 | 海信（广东）空调有限公司 | Defrosting control method for air conditioner |
| CN115682512A (en) * | 2021-07-30 | 2023-02-03 | 青岛海尔电冰箱有限公司 | Refrigerating and freezing device and control method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH079331B2 (en) * | 1986-12-26 | 1995-02-01 | 松下電器産業株式会社 | Operation control method for heat pump type air conditioner |
-
1991
- 1991-12-27 KR KR1019910024641A patent/KR950000738B1/en not_active IP Right Cessation
-
1992
- 1992-12-03 JP JP4324192A patent/JP2514774B2/en not_active Expired - Fee Related
- 1992-12-22 DE DE4243634A patent/DE4243634C2/en not_active Expired - Fee Related
- 1992-12-26 CN CN92114987A patent/CN1072350C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0666461A (en) | 1994-03-08 |
| CN1073760A (en) | 1993-06-30 |
| KR930013607A (en) | 1993-07-22 |
| DE4243634C2 (en) | 2002-08-14 |
| KR950000738B1 (en) | 1995-01-28 |
| DE4243634A1 (en) | 1993-07-01 |
| JP2514774B2 (en) | 1996-07-10 |
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