CN101451779B - Defrosting control method for heat pump air conditioner - Google Patents

Defrosting control method for heat pump air conditioner Download PDF

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CN101451779B
CN101451779B CN200710195430A CN200710195430A CN101451779B CN 101451779 B CN101451779 B CN 101451779B CN 200710195430 A CN200710195430 A CN 200710195430A CN 200710195430 A CN200710195430 A CN 200710195430A CN 101451779 B CN101451779 B CN 101451779B
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heat exchanger
outdoor heat
outdoor
temperature range
exchanger temperature
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CN200710195430A
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Chinese (zh)
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CN101451779A (en
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国德防
毛守博
何建奇
王海胜
赵晓红
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海尔集团公司
青岛海尔空调电子有限公司
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Abstract

The invention discloses a method for controlling defrosting of a heat pump air-conditioner, comprising the following steps: 1) dividing outdoor environment temperatures into a plurality of stages; 2) setting a plurality of outdoor heat exchanger temperature ranges corresponding to each outdoor environment temperature stage; wherein each temperature range is corresponding to a predetermined cumulative time standard length; 3) calculating the total of the time when the outdoor heat exchanger temperature is within the range of each outdoor heat exchanger temperature; 4) calculating the quotient of the time calculated in step 3) and the corresponding cumulative time standard length set in step 2); 5) calculating the sum of the quotient of the total of the time when the outdoor heat exchanger temperature is within the range of each outdoor heat exchanger temperature calculated in step 3) and the corresponding cumulative time standard length, to obtain accumulated calculation coefficient; and 6)when the accumulated calculation coefficient is more than or equal to 1, starting the defrosting operation. The inventive method for controlling defrosting of the heat pump air-conditioner is used for solving the technical problem that the air-conditioner defrosting starting time is not accurate in prior art.

Description

Defrosting control method for heat pump air conditioner

Technical field

The present invention relates to a kind of method of air-conditioner defrosting, particularly a kind of defrosting control method of wind-cooling type heat pump air-conditioning system and system.

Background technology

Outdoor wind-cooling type heat pump air-conditioning system, frosting easily on the outdoor condenser makes the heat exchange deleterious of outside, thereby causes the indoor heating deleterious of system when low-temperature heating.When frosting acquired a certain degree, it is very poor that the indoor set heating effect will become, even blow a cold wind over.At this time just need remove the frost of tying on the outdoor condenser,, improve the heating effect of indoor set with the heat exchange effect in the recovery room outside.

At present, the wind-cooling type heat pump air-conditioning system generally all is the mode that switches to refrigeration through the cross valve switching-over, carries out the defrosting of outdoor heat exchanger.For the control of air-conditioner defrosting, key is the definite of entry condition that defrost.Just right defrosting entry condition will make air-conditioning system be in the steady running state to greatest extent, guarantees user's result of use, can also effectively reduce the consumption of electric energy simultaneously, reduces the operating cost of air-conditioning.

Air-cooled heat pump air-conditioning system in the market, the defrosting entry condition generally has two kinds: a kind of is when outdoor ring temperature is low, and every separated set time gets into the defrosting running.This mode is controlled fairly simple; Use wider; But have following defective: every separated set time gets into the Defrost mode of defrosting running, can't judge the real frosting situation of off-premises station, is mechanical every separated set time to switch to cooling operation to defrost.Therefore, when off-premises station does not have frosting or frosting seldom, occur the situation of defrosting running easily, cause waste of electric energy, also make the indoor heating effect fluctuation occur.When frosting is too much in the outside, occur long situation about just defrosting of duration easily, defrosting also can make the indoor heating effect reduce not to the utmost when causing the defrosting running.

Another kind of defrosting entry condition is when outdoor environment temperature is low, through the temperature at sensing chamber external heat exchanger middle part, judges whether get into the defrosting running.This mode is controlled fairly simple, uses extensivelyr, but also has following defective:

Temperature through sensing chamber external heat exchanger middle part is judged the mode that whether gets into the defrosting running, just judges whether get into defrosting according to detected condenser middle part temperature in the short time, true frosting situation that under many circumstances can not the agent's room outside.Condense into the accumulation of frost because outdoor heat exchanger frosting process is a kind of water in air part, and the heat exchanger that detects in short time middle part temperature fluctuates because of the variation of indoor and outdoor load easily, thus the entry time that can cause defrosting in advance or postpone.When off-premises station has frosting or frosting seldom, do not get into defrosting in advance, can cause waste of electric energy, make the indoor heating effect fluctuation occur.Just get into the defrosting running when frosting is too much in the outside, defrosting also can make the indoor heating effect reduce not to the utmost in the time of can causing the defrosting running.

Granted publication number is CN1215295C; Denomination of invention is the Chinese invention patent of " air conditioner and Defrost method thereof "; A kind of self adaptation Defrost method of air conditioner is disclosed; The central control unit of air conditioner is through the variation relation between detected outdoor heat exchanger temperature T 2 and the outdoor environment temperature T1, and combines compressor operating time and Defrost operation time, judge long-pending frost and the defrosting situation on the off-premises station according to the following steps and control entering or withdraw from Defrost operation: A, heating operation begins; Timer is to carrying out timing the running time of compressor; When the time of heating reached Tm1, the temperature T 2 and the outdoor environment temperature T1 of measuring cell external heat exchanger calculated temperature approach between the two, and preserve as the standard temperature approach; B, when the time of heating is equal to or greater than Tm2, temperature T of kinetic measurement outdoor heat exchanger 2 and outdoor environment temperature T1 are calculated dynamic temperature difference value between the two; C, when said dynamic temperature difference value more than or equal to predetermined temperature difference controlling value X1 during with said standard temperature approach sum, entering Defrost operation, and the Defrost operation time carry out timing by timer team; D, when Defrost operation time during less than predetermined maximum defrosting time; If the temperature of outdoor heat exchanger is lower than predetermined defrosting end temp; Then keep Defrost operation and timing; If the temperature of outdoor heat exchanger is equal to or greater than predetermined defrosting end temp, then judge whether to carry out parameter adjustment and finish Defrost operation; If the E Defrost operation time is equal to or greater than predetermined maximum defrosting time, then judge whether to carry out parameter adjustment and finish Defrost operation.Wherein, said Tm1 is the moment that measures the normal temperature difference, and promptly air-conditioning gets into stable operation and is in moment of best heat pump state, and said Tm2 is the shortest heating operation time of heat pump operating mode.

The said Defrost method of this patent can in conjunction with compressor operating time and Defrost operation time, confirm to get into Defrost operation and the condition that finishes Defrost operation according to the variation relation between outdoor heat exchanger temperature T 2 and the outdoor environment temperature T1.But this patent just according to the standard temperature approach of the temperature difference of the temperature of outdoor heat exchanger and outdoor environment temperature and setting relatively, is confirmed the condition that defrosting gets into, and the moment that possibly cause entering to defrost is inaccurate.This be since outdoor air-cooled heat pump air-conditioning when low-temperature heating turns round; Determine the principal element of its outside frosting degree not only to comprise the temperature difference of outside condenser temperature and outdoor environment temperature; The factors such as water capacity that also comprise outdoor environment temperature, outdoor air; When other conditions are identical, the water capacity of outdoor air is big more, and the frost of tying on the outdoor heat exchanger in the identical time is just many more.

Therefore, how a kind of defrosting control method for heat pump air conditioner being provided, solving defrosting entering inaccurate problem of the moment in the prior art, is those skilled in the art's technical issues that need to address.

Summary of the invention

The purpose of this invention is to provide a kind of defrosting control method for heat pump air conditioner, be used for solving the prior art air-conditioner defrosting and get into inaccurate technical problem constantly.

Specifically, the present invention provides a kind of defrosting control method for heat pump air conditioner, may further comprise the steps:

1) outdoor environment temperature is divided into a plurality of stages;

2) corresponding each outdoor environment temperature stage is provided with a plurality of outdoor heat exchanger temperature ranges, and each said outdoor heat exchanger temperature range correspondence is provided with the cumulative time full-length in advance;

3) cumulative calculation outdoor heat exchange actuator temperature is in the time of each outdoor heat exchanger temperature range;

4) calculation procedure 3) time and the corresponding step 2 calculated) merchant between the cumulative time full-length of setting;

5) calculate the outdoor environment temperature that step 4) is calculated be in each outdoor heat exchanger temperature range cumulative time with corresponding cumulative time full-length merchant's and, obtain the accumulation calculating coefficient;

6) when said accumulation calculating coefficient more than or equal to 1 the time, get into Defrost operation.

Preferably, said outdoor heat exchange actuator temperature is specially the measurement temperature at outdoor heat exchanger middle part.

Preferably, said outdoor heat exchange actuator temperature is through being installed in the temperature sensor measurement of outdoor heat exchanger coil temperature lowest point.

Preferably, said accumulated time full-length is heating when running, through testing the predefined defrost interval time at said air-conditioning.

Preferably, said step 1) is divided into a plurality of stages with outdoor environment temperature, specifically divides according to the difference of saturated air water capacity under the varying environment temperature.

Preferably, outdoor environment temperature is divided into three phases, is specially A stage, B stage and C stage.

Preferably, the said outdoor environment temperature A stage is provided with 3 outdoor heat exchanger temperature ranges, is specially the first outdoor heat exchanger temperature range, the second outdoor heat exchanger temperature range and the 3rd outdoor heat exchanger temperature range;

The said outdoor environment temperature B stage is provided with 2 outdoor heat exchanger temperature ranges, is specially fourth ventricle external heat exchanger temperature range and the 5th outdoor heat exchanger temperature range;

The said outdoor environment temperature C stage is provided with 2 outdoor heat exchanger temperature ranges, is specially the 6th outdoor heat exchanger temperature range and the 7th outdoor heat exchanger temperature range.

Preferably, said first outdoor heat exchanger temperature range cumulative time full-length not; Said other outdoor heat exchanger temperature range is provided with the cumulative time full-length respectively accordingly in advance.

Preferably, outdoor environment temperature is divided into four-stage, is specially I stage, II stage, III stage and IV stage;

The said outdoor environment temperature I stage is provided with 3 outdoor heat exchanger temperature ranges, is specially the tenth outdoor heat exchanger temperature range, the 11 outdoor heat exchanger temperature range and the 12 outdoor heat exchanger temperature range;

The said outdoor environment temperature II stage is provided with 2 outdoor heat exchanger temperature ranges, is specially the 13 outdoor heat exchanger temperature range and the 14 outdoor heat exchanger temperature range;

The said outdoor environment temperature III stage is provided with 2 outdoor heat exchanger temperature ranges, is specially the 15 outdoor heat exchanger temperature range and the 16 outdoor heat exchanger temperature range.

The said outdoor environment temperature IV stage is provided with 2 outdoor heat exchanger temperature ranges, is specially the 17 outdoor heat exchanger temperature range and the 18 outdoor heat exchanger temperature range.

Preferably, said the tenth outdoor heat exchanger temperature range cumulative time full-length not; Said other outdoor heat exchanger temperature range is provided with the cumulative time full-length respectively accordingly in advance

The embodiment of the invention is through the judgement to the accumulation calculating coefficient, to confirm the appropriate entry condition of Defrost operation.Said accumulation calculating coefficient has comprised the outdoor heat exchange actuator temperature of outdoor environment temperature and detection, and the principal element of the decision off-premises station frostings such as humidity relation of temperature range outside the different chamber, therefore can confirm the entry condition that Defrost operation is appropriate exactly.Heat pump air conditioner Defrost method according to the invention avoids false defrosting and defrosting phenomenon not to the utmost to take place effectively, has guaranteed user's result of use, has saved the consumption of electric energy.

Description of drawings

Fig. 1 is a defrosting control method for heat pump air conditioner flow chart according to the invention;

Fig. 2 is heat pump type air conditioning system figure according to the invention.

The specific embodiment

The present invention provides a kind of defrosting control method for heat pump air conditioner, is used for solving the prior art air-conditioner defrosting and gets into inaccurate technical problem constantly.

Below in conjunction with accompanying drawing the specific embodiment of the invention is described.

Referring to Fig. 1 and Fig. 2, Fig. 1 is a defrosting control method for heat pump air conditioner flow chart according to the invention; Fig. 2 is heat pump type air conditioning system figure according to the invention.

General knowledge according to the refrigeration specialty can be known; Outdoor air-cooled heat pump air-conditioning determines the principal element of its outside frosting degree to have when low-temperature heating turns round: the temperature difference of the water capacity of outdoor environment temperature, outdoor air, outside condenser middle part temperature and outdoor environment temperature.

When outdoor environment temperature is low more, when the temperature difference of outdoor heat exchange condenser middle part temperature and outdoor environment temperature is big more, airborne moisture content is just formed frost more easily.Under the same conditions, the water capacity of outdoor air is big more, and frosting degree is just many more on the interior outdoor heat exchanger of identical time.

The said heat pump air conditioner Defrost method of the embodiment of the invention specifically may further comprise the steps:

S10, outdoor environment temperature is divided into a plurality of stages.

It specifically is to divide according to the difference of saturated air water capacity under the varying environment temperature that outdoor environment temperature is divided, and can be divided into a plurality of stages.

S20, corresponding each outdoor environment temperature stage are provided with a plurality of outdoor heat exchanger temperature ranges, and each said temperature range correspondence is provided with the cumulative time full-length in advance.

Said outdoor heat exchange actuator temperature is specially the measurement temperature at outdoor heat exchanger middle part.Said outdoor heat exchange actuator temperature is through being installed in the temperature sensor measurement of outdoor heat exchanger coil temperature lowest point.

S30, cumulative calculation outdoor heat exchange actuator temperature are in the time of each outdoor heat exchanger temperature range.

Merchant between the cumulative time full-length that time that S40, calculation procedure S30 calculate and corresponding step S20 are provided with.

S50, the outdoor environment temperature that step S40 is calculated are in each outdoor heat exchanger temperature range cumulative time and corresponding cumulative time full-length merchant addition, obtain the accumulation calculating coefficient.

S60, whether judge said accumulation calculating coefficient more than or equal to 1, if, execution in step S70 then, otherwise execution in step S30.

S70, entering Defrost operation.

The embodiment of the invention is through the judgement to the accumulation calculating coefficient, to confirm the appropriate entry condition of Defrost operation.Said accumulation calculating coefficient has comprised the outdoor heat exchange actuator temperature of outdoor environment temperature and detection, and the principal element of the decision off-premises station frostings such as humidity relation of temperature range outside the different chamber, therefore can confirm the entry condition that Defrost operation is appropriate exactly.Heat pump air conditioner Defrost method according to the invention avoids false defrosting and defrosting phenomenon not to the utmost to take place effectively, has guaranteed user's result of use, has saved the consumption of electric energy.

Because when environment temperature was low more, the water capacity of air was low more, frosting is just few more within a certain period of time, and the outdoor heat exchanger middle part temperature and the environment temperature temperature difference are big more, and frosting is just fast more.Therefore, can judge the frosting situation of outdoor heat exchanger more exactly according to the accumulated time of outdoor heat exchanger middle part temperature under certain outdoor environment temperature.

It specifically is to divide according to the difference of saturated air water capacity under the varying environment temperature that outdoor environment temperature is divided, and can be divided into a plurality of stages.

According to this principle, under the varying environment temperature, according to temperature value and accumulation definite defrosting duration of runs entry condition of outdoor heat exchanger middle part detection.As shown in table 1, data are merely example in the table, are not definite value.

Referring to table 1, we specify control procedure of the present invention outdoor environment temperature is divided into the situation of three phases.

Table 1: outdoor environment temperature is divided into the defrosting entry condition table under the three phases situation

Shown in the table 1, outdoor environment temperature is divided into three phases, be specially >=A stage of-3.0 ℃, >=-10 ℃ and<B stage of-3.0 ℃, and<C stage of-10 ℃.

The said outdoor environment temperature A stage is provided with 3 outdoor heat exchanger temperature ranges; Be specially>-4.0 ℃ the first outdoor heat exchanger temperature range,>=-7.0 ℃ and≤-4.0 ℃ of second outdoor heat exchanger temperature range, and<-7.0 ℃ the 3rd outdoor heat exchanger temperature range.

The said outdoor environment temperature B stage is provided with 2 outdoor heat exchanger temperature ranges, be specially >=-12.0 ℃ fourth ventricle external heat exchanger temperature range and<-12.0 ℃ the 5th outdoor heat exchanger temperature range.

The said outdoor environment temperature C stage is provided with 2 outdoor heat exchanger temperature ranges, be specially >=-22.0 ℃ the 6th outdoor heat exchanger temperature range and<-22.0 ℃ the 7th outdoor heat exchanger temperature range.

The said first outdoor heat exchanger temperature range is the cumulative time full-length not; Said other outdoor heat exchanger temperature range is provided with the cumulative time full-length respectively accordingly in advance.

The corresponding cumulative time full-length of the said second outdoor heat exchanger temperature range is the second cumulative time full-length, is specially 75min.

The corresponding cumulative time full-length of said the 3rd outdoor heat exchanger temperature range is the 3rd cumulative time full-length, is specially 45min.

The corresponding cumulative time full-length of said fourth ventricle external heat exchanger temperature range is the 4th cumulative time full-length, is specially 100min.

The corresponding cumulative time full-length of said the 5th outdoor heat exchanger temperature range is the 5th cumulative time full-length, is specially 70min.

The corresponding cumulative time full-length of said the 6th outdoor heat exchanger temperature range is the 6th cumulative time full-length, is specially 115min.

The corresponding cumulative time full-length of said the 7th outdoor heat exchanger temperature range is the 7th cumulative time full-length, is specially 85min.

The stage of outdoor environment temperature not necessarily only is divided into 3 stages according to different division of saturated air water capacity under the varying environment temperature, can divide thinner during practical application.The accumulated time full-length is in different accordingly outdoor environment temperature stages and different outdoor heat exchanger temperature ranges, heats the blanking time of the optimum defrosting that running tests.

When outdoor environment temperature is divided into three phases, said outdoor heat exchanger middle part temperature installation table 1 mode is divided, and said accumulated time full-length also is in the table 1 during predefined numerical value, and the computing formula of said accumulation calculating coefficient is following:

Said accumulation calculating coefficient=∑ (T A2/ 75+T A3/ 45+T B4/ 100+T B5/ 70+T C6/ 115+T C7/ 85)

Wherein, T A2Be in environment temperature respectively at A during the stage, the time that outdoor heat exchanger middle part temperature is accumulated in the second outdoor heat exchanger temperature range;

T A3Be in environment temperature respectively at A during the stage, the time that outdoor heat exchanger middle part temperature is accumulated in the 3rd outdoor heat exchanger temperature range;

T B4Be in environment temperature respectively at B during the stage, the time that outdoor heat exchanger middle part temperature is accumulated in fourth ventricle external heat exchanger temperature range;

T B5Be in environment temperature respectively at B during the stage, the time that outdoor heat exchanger middle part temperature is accumulated in the 5th outdoor heat exchanger temperature range;

T C6Be in environment temperature respectively at C during the stage, the time that outdoor heat exchanger middle part temperature is accumulated in the 6th outdoor heat exchanger temperature range;

T C7Be in environment temperature respectively at C during the stage, the time that outdoor heat exchanger middle part temperature is accumulated in the 7th outdoor heat exchanger temperature range;

Te is detected outdoor heat exchanger middle part temperature (testing the temperature sensor location of this temperature, generally is the minimum point of this outdoor heat exchanger coil temperature when heating running).

Defrosting entry condition: satisfy " accumulation calculating coefficient >=1 " condition and continue reasonable time, can get into the defrosting running.

If the outdoor environment temperature in somewhere afternoon to evening changes between-2 ℃~-5 ℃, said air-conditioning is heating running.In operation process, there is frosting in outdoor heat exchanger.According to the different chamber's outer shroud temperature sensor stage and the interior accumulated time of different chamber's external heat exchanger temperature range in the table 1 of being in of each parameter value in the table 1 and reality, draw table 2.

Table 2: outdoor environment temperature is divided into the actual conditions table of three phases situation

Because outdoor environment temperature at-2 ℃~-5 ℃, therefore belongs to A, B stage in subordinate list 1 and the table 2.

Accumulation design factor=∑ (T A2/ 75+T A3/ 45+T B4/ 100+T B5/ 70+T C6/ 115+T C7/ 85)

=∑(T A2/75+T A3/45+T B4/100+T B5/70)

Accumulated time T when test A2, T A3, T B4, T B5, in the time of after above-mentioned formula calculating, satisfying " accumulation design factor>=1 ", the cross valve of said air-conditioning switches the entering defrosting and turns round.Can certainly adopt the mode of not switching cross valve in the prior art to carry out Defrost operation.

After the defrosting running finished, said air-conditioning switched to and heats operating condition.Then, carry out corresponding time accumulative total according to the said defrosting control method for heat pump air conditioner of the embodiment of the invention once more, calculate said cumulative calculation coefficient in real time, during through judgement " accumulation design factor >=1 ", control said air-conditioning and get into Defrost operation.So circulation is carried out.

Defrost operation process according to the invention can be carried out according to conventional control mode in the prior art with the defrosting exit criteria, and the present invention does not do at this and gives unnecessary details.

Heating process according to the invention, the flow process of cold-producing medium is specially: compressor 4 exhaust outlets---tracheae stop valve 7---indoor heat exchanger 2---liquid pipe stop valve 6---throttling arrangement (not shown among Fig. 2)---outdoor heat exchanger 1---cross valve 3---gas-liquid separator 5---compressor 4 air intake ducts.

Defrost operation process according to the invention, the flow process of cold-producing medium is specially: compressor 4 exhaust outlets---cross valve 3---outdoor heat exchanger 1---throttling arrangement (not shown among Fig. 2)---liquid pipe stop valve 6---indoor heat exchanger 2---tracheae stop valve 7---cross valve 3---gas-liquid separator 5---compressor 4 air intake ducts.

Under the varying environment temperature, according to temperature value and accumulation definite defrosting duration of runs entry condition of outdoor heat exchanger middle part detection.Referring to table 3, outdoor environment temperature is divided into the situation of four-stage, specify control procedure of the present invention.Data are merely example in the table 3, are not definite value.

Table 3: outdoor environment temperature is divided into the defrosting entry condition table under the four-stage situation

Shown in the table 3, outdoor environment temperature is divided into four-stage, be specially >=I stage of-3.0 ℃, >=-7 ℃ and<II stage of-3.0 ℃, >=-10 ℃ and<III stage of-7.0 ℃ and<-10 ℃ the IV stage.

The said outdoor environment temperature I stage is provided with 3 outdoor heat exchanger temperature ranges; Be specially>-4.0 ℃ the tenth outdoor heat exchanger temperature range,>=-7.0 ℃ and≤-4.0 ℃ of the 11 outdoor heat exchanger temperature range, and<-7.0 ℃ the 12 outdoor heat exchanger temperature range.

The said outdoor environment temperature II stage is provided with 2 outdoor heat exchanger temperature ranges, be specially >=-12.0 ℃ the 13 outdoor heat exchanger temperature range and<-12.0 ℃ the 14 outdoor heat exchanger temperature range.

The said outdoor environment temperature III stage is provided with 2 outdoor heat exchanger temperature ranges, be specially >=-18.0 ℃ the 15 outdoor heat exchanger temperature range and<-18.0 ℃ the 16 outdoor heat exchanger temperature range.

The said outdoor environment temperature IV stage is provided with 2 outdoor heat exchanger temperature ranges, be specially >=-22.0 ℃ the 17 outdoor heat exchanger temperature range and<-22.0 ℃ the 18 outdoor heat exchanger temperature range.

Said the tenth outdoor heat exchanger temperature range is the cumulative time full-length not; Said other outdoor heat exchanger temperature range is provided with the cumulative time full-length respectively accordingly in advance.

The corresponding cumulative time full-length of said the 11 outdoor heat exchanger temperature range is the 11 cumulative time full-length, is specially 75min.

The corresponding cumulative time full-length of said the 12 outdoor heat exchanger temperature range is the 12 cumulative time full-length, is specially 45min.

The corresponding cumulative time full-length of said the 13 outdoor heat exchanger temperature range is the 13 cumulative time full-length, is specially 100min.

The corresponding cumulative time full-length of said the 14 outdoor heat exchanger temperature range is the 14 cumulative time full-length, is specially 70min.

The corresponding cumulative time full-length of said the 15 outdoor heat exchanger temperature range is the 15 cumulative time full-length, is specially 110min.

The corresponding cumulative time full-length of said the 16 outdoor heat exchanger temperature range is the 16 cumulative time full-length, is specially 80min.

The corresponding cumulative time full-length of said the 17 outdoor heat exchanger temperature range is the 17 cumulative time full-length, is specially 120min.

The corresponding cumulative time full-length of said the 18 outdoor heat exchanger temperature range is the 18 cumulative time full-length, is specially 85min.

When outdoor environment temperature is divided into four-stage, said outdoor heat exchanger middle part temperature installation table 3 mode is divided, and said accumulated time full-length also is in the table 3 during predefined numerical value, and the computing formula of said accumulation calculating coefficient is following:

Said accumulation calculating coefficient=∑ (T A1175+T A12/ 45+T B13/ 100+T B14/ 70+T C15/ 110+T C16/ 80+T D17/ 120+T D18/ 85)

Wherein, T A11Be in environment temperature respectively at I during the stage, the time that outdoor heat exchanger middle part temperature is accumulated in the 11 outdoor heat exchanger temperature range;

T A12Be in environment temperature respectively at I during the stage, the time that outdoor heat exchanger middle part temperature is accumulated in the 12 outdoor heat exchanger temperature range;

T B13Be in environment temperature respectively at II during the stage, the time that outdoor heat exchanger middle part temperature is accumulated in the 13 outdoor heat exchanger temperature range;

T B14Be in environment temperature respectively at II during the stage, the time that outdoor heat exchanger middle part temperature is accumulated in the 14 outdoor heat exchanger temperature range;

T C15Be in environment temperature respectively at III during the stage, the time that outdoor heat exchanger middle part temperature is accumulated in the 15 outdoor heat exchanger temperature range;

T C16Be in environment temperature respectively at III during the stage, the time that outdoor heat exchanger middle part temperature is accumulated in the 16 outdoor heat exchanger temperature range;

T D17Be in environment temperature respectively at IV during the stage, the time that outdoor heat exchanger middle part temperature is accumulated in the 17 outdoor heat exchanger temperature range;

T D18Be in environment temperature respectively at IV during the stage, the time that outdoor heat exchanger middle part temperature is accumulated in the 18 outdoor heat exchanger temperature range;

Te is detected outdoor heat exchanger middle part temperature (testing the temperature sensor location of this temperature, generally is the minimum point of this outdoor heat exchanger coil temperature when heating running).

The corresponding cumulative time full-length of said the 11 outdoor heat exchanger temperature range is the 11 cumulative time full-length; The corresponding cumulative time full-length of said the 12 outdoor heat exchanger temperature range is the 12 cumulative time full-length; The corresponding cumulative time full-length of said the 13 outdoor heat exchanger temperature range is the 13 cumulative time full-length; The corresponding cumulative time full-length of said the 14 outdoor heat exchanger temperature range is the 14 cumulative time full-length; The corresponding cumulative time full-length of said the 15 outdoor heat exchanger temperature range is the 15 cumulative time full-length; The corresponding cumulative time full-length of the 16 outdoor heat exchanger temperature range is the 16 cumulative time full-length; The corresponding cumulative time full-length of the 17 outdoor heat exchanger temperature range is the 17 cumulative time full-length.The concrete time value of above-mentioned cumulative time full-length can be with reference to corresponding numerical value among the figure 3.

Accumulated time T when test A11, T A12, T B13, T B14, T C15, T C16, T D17And T D18, through the said accumulation calculating coefficient=∑ of above-mentioned formula (T A1175+T A12/ 45+T B13/ 100+T B14/ 70+T C15/ 110+T C16/ 80+T D17/ 120+T D18When/85) after the calculating, satisfying " accumulation design factor>=1 ", the cross valve switching of said air-conditioning gets into the running that defrosts.Can certainly adopt the mode of not switching cross valve in the prior art to carry out Defrost operation.

After the defrosting running finished, said air-conditioning switched to and heats operating condition.Then, carry out corresponding time accumulative total according to the said defrosting control method for heat pump air conditioner of the embodiment of the invention once more, calculate said cumulative calculation coefficient in real time, during through judgement " accumulation design factor >=1 ", control said air-conditioning and get into Defrost operation.So circulation is carried out.

Defrost operation process according to the invention can be carried out according to conventional control mode in the prior art with the defrosting exit criteria, and the present invention does not do at this and gives unnecessary details.

The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.

Claims (10)

1. a defrosting control method for heat pump air conditioner is characterized in that, may further comprise the steps:
1) outdoor environment temperature is divided into a plurality of stages;
2) corresponding each outdoor environment temperature stage is provided with a plurality of outdoor heat exchanger temperature ranges, and each said outdoor heat exchanger temperature range correspondence is provided with the cumulative time full-length in advance;
3) cumulative calculation outdoor heat exchange actuator temperature is in the time of each outdoor heat exchanger temperature range;
4) calculation procedure 3) time and the corresponding step 2 calculated) merchant between the cumulative time full-length of setting;
5) calculate the outdoor environment temperature that step 4) is calculated be in each outdoor heat exchanger temperature range cumulative time with corresponding cumulative time full-length merchant's and, obtain the accumulation calculating coefficient;
6) when said accumulation calculating coefficient more than or equal to 1 the time, get into Defrost operation.
2. defrosting control method for heat pump air conditioner according to claim 1 is characterized in that, said outdoor heat exchange actuator temperature is specially the measurement temperature at outdoor heat exchanger middle part.
3. defrosting control method for heat pump air conditioner according to claim 2 is characterized in that, said outdoor heat exchange actuator temperature is through being installed in the temperature sensor measurement of outdoor heat exchanger coil temperature lowest point.
4. defrosting control method for heat pump air conditioner according to claim 1 is characterized in that, said accumulated time full-length is heating when running, through testing the predefined defrost interval time at said air-conditioning.
5. defrosting control method for heat pump air conditioner according to claim 1 is characterized in that said step 1) is divided into a plurality of stages with outdoor environment temperature, specifically divides according to the difference of saturated air water capacity under the varying environment temperature.
6. according to claim 4 or 5 described defrosting control method for heat pump air conditioner, it is characterized in that, outdoor environment temperature is divided into three phases, be specially A stage, B stage and C stage.
7. defrosting control method for heat pump air conditioner according to claim 6; It is characterized in that; The said outdoor environment temperature A stage is provided with 3 outdoor heat exchanger temperature ranges, is specially the first outdoor heat exchanger temperature range, the second outdoor heat exchanger temperature range and the 3rd outdoor heat exchanger temperature range;
The said outdoor environment temperature B stage is provided with 2 outdoor heat exchanger temperature ranges, is specially fourth ventricle external heat exchanger temperature range and the 5th outdoor heat exchanger temperature range;
The said outdoor environment temperature C stage is provided with 2 outdoor heat exchanger temperature ranges, is specially the 6th outdoor heat exchanger temperature range and the 7th outdoor heat exchanger temperature range.
8. defrosting control method for heat pump air conditioner according to claim 7 is characterized in that, the said first outdoor heat exchanger temperature range is the cumulative time full-length not; Said other outdoor heat exchanger temperature range is provided with the cumulative time full-length respectively accordingly in advance.
9. defrosting control method for heat pump air conditioner according to claim 5 is characterized in that, outdoor environment temperature is divided into four-stage, is specially I stage, II stage, III stage and IV stage;
The said outdoor environment temperature I stage is provided with 3 outdoor heat exchanger temperature ranges, is specially the tenth outdoor heat exchanger temperature range, the 11 outdoor heat exchanger temperature range and the 12 outdoor heat exchanger temperature range;
The said outdoor environment temperature II stage is provided with 2 outdoor heat exchanger temperature ranges, is specially the 13 outdoor heat exchanger temperature range and the 14 outdoor heat exchanger temperature range;
The said outdoor environment temperature III stage is provided with 2 outdoor heat exchanger temperature ranges, is specially the 15 outdoor heat exchanger temperature range and the 16 outdoor heat exchanger temperature range.
The said outdoor environment temperature IV stage is provided with 2 outdoor heat exchanger temperature ranges, is specially the 17 outdoor heat exchanger temperature range and the 18 outdoor heat exchanger temperature range.
10. defrosting control method for heat pump air conditioner according to claim 9 is characterized in that, said the tenth outdoor heat exchanger temperature range is the cumulative time full-length not; Said other outdoor heat exchanger temperature range is provided with the cumulative time full-length respectively accordingly in advance.
CN200710195430A 2007-11-28 2007-11-28 Defrosting control method for heat pump air conditioner CN101451779B (en)

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