CN109654774A - Defrosting control method and air source heat pump system - Google Patents
Defrosting control method and air source heat pump system Download PDFInfo
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- CN109654774A CN109654774A CN201811551164.8A CN201811551164A CN109654774A CN 109654774 A CN109654774 A CN 109654774A CN 201811551164 A CN201811551164 A CN 201811551164A CN 109654774 A CN109654774 A CN 109654774A
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- 238000010257 thawing Methods 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 83
- 230000008569 process Effects 0.000 claims abstract description 39
- 239000003507 refrigerant Substances 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 239000003570 air Substances 0.000 claims description 83
- 238000001514 detection method Methods 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 8
- 239000012080 ambient air Substances 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims 2
- 239000007788 liquid Substances 0.000 description 8
- 238000001704 evaporation Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
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Classifications
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- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
-
- 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
-
- 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
- F25B2600/01—Timing
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/02—Humidity
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Defrosting Systems (AREA)
Abstract
the invention discloses a defrosting control method and an air source heat pump system, which comprises the following steps of (1) detecting an air temperature Ts, a coil temperature Tg and an ambient temperature Ta close to an evaporator refrigerant inlet position according to a period T, (2) calculating a difference value △ T1 between the air temperature Ts and the coil temperature Tg and calculating a difference value △ T2 between the ambient temperature Ta and the air temperature Ts, (3) if the △ T1 is not greater than a first set threshold and the △ T2 is not less than a second set threshold, enabling the system to enter a defrosting process, and if not, enabling the system to run a heating process.
Description
Technical field
The present invention relates to a kind of defrosting control technology fields, specifically, being to be related to a kind of defrosting control method and heat pump
Water heater.
Background technique
Air source heat pump in winter heat supply running when, frost will usually occur for outdoor heat exchanger, when frost layer reaches one
When determining thickness, heat exchanging device is needed to defrost, the Defrost method being most widely used at present be indoor/outdoor two temperature-when
Between method, this method is simple, it is cheap, be easy to implement, but it is applied under cold dry operating condition (such as North China), is but often gone out
Defrosting accident is now missed, studies have shown that under the operating condition, always the defrost ratio of number of " frostless defrosting " accident Zhan is up to 70%, causes
Effective heating load of system is substantially lost, and COP declines to a great extent, and threatens the safe operation of unit, system reliability of operation
It substantially reduces, there are also some other Defrost methods, such as temperature-humidity-time, air side pressure difference, blower electric current-evaporation temperature
Degree, Laser Measuring frost, photoelectric coupling and conversion method etc., cause due to these methods are being not easy to carry out, cost is excessively high etc. its
It is difficult to apply in practice, so research and development are simple and reliable, at low cost, whatsoever environment can realize the defrosting side of " defrosting on demand "
Method is necessary, and is the important guarantee of air source heat pump high efficient and reliable operation.
Summary of the invention
The present invention enters defrosting condition judgement inaccuracy to solve existing air source heat pump, is easy to appear the event that accidentally defrosts
Barrier, the technical issues of leading to energy loss, while threatening unit safety operation, proposes a kind of defrosting control method, can solve
The certainly above problem.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following scheme:
A kind of defrosting control method, comprising the following steps:
(1), air themperature Ts, coil temperature Tg at the evaporator refrigerant inlet position and separate are detected according to period t
Environment temperature Ta at evaporator position；
(2), the difference △ T1 of air themperature Ts and coil temperature Tg are calculated and calculate environment temperature Ta and air themperature Ts it
Between difference △ T2；
(3) if, △ T1 is no more than the first given threshold and △ T2 is not less than the second given threshold, execute defrosting control logic,
Otherwise, defrosting control logic is not executed.
Further, before step (1), further include the steps that the air humidity φ for detecting evaporator air inlet, and root
Period t is determined according to the air humidity φ.
Further, the method for period t being determined according to the air humidity φ are as follows:
As air humidity φ < m1, period t value 0 does not detect environment temperature Ts,
As m1≤φ < m2, period t value t1,
As m2≤φ < m3, period t value t2,
As m3≤φ < m4, period t value t3,
As φ >=m4, period t value t4；
Wherein, 0 < m1 < m2 < m3 < m4 < 1, t1 > t2 > t3 > t4 > 0.
Further, before step (1), further include the steps that system operation time timing, step (3) if in it is full simultaneously
Pedal system runing time is not less than the first setting time, then executes defrosting control logic.
Further, further include the steps that judging current air temperature Ts in step (3), when Ts is met certain condition simultaneously
When, system just can enter defrosting process, and otherwise, system runs heating operations, if current air temperature Ts is greater than the first setting temperature
Degree and less than the second set temperature, then system enters defrosting process, wherein the first set temperature is less than the second set temperature.
Further, if current air temperature Ts is greater than third set temperature and when less than the 4th set temperature, system into
Enter defrosting process, then compressor is out of service, and the fan of evaporator operates normally, wherein third set temperature is greater than first and sets
Determine temperature and less than the 4th set temperature.
It further, further include sentencing when the defrosting process of system is reverse cycle defrosting mode or hot gas bypass defrosting mode
The step of disconnected current air temperature Ts, if current air temperature Ts is greater than the 5th set temperature, system defrosting process terminates, extensive
Multiple normal heating operations, wherein the 5th set temperature is greater than 0.
Further, system enters in the third setting time after defrosting process in step (3), further include calculate it is current
The step of air themperature Ts change rate, if current air temperature Ts change rate is greater than the second given threshold, system exits defrosting
Process.
Further, when the defrosting process of system be reverse cycle defrosting mode except other Defrost modes when, step (3)
The middle defrosting process that enters further includes the steps that carrying out timing to defrosting duration later, if defrosting duration is set not less than second
Between, then system exits defrosting process.
The present invention proposes a kind of heat pump system, including compressor, evaporator simultaneously, and the evaporator includes and the pressure
The coil pipe and the fin fixed with the coil pipe of contracting machine connection further include the first temperature sensor and second temperature sensor with
And third temperature sensor, first temperature sensor are set to when heating mode close to evaporator refrigerant inlet position
Place, positioned at adjacent two fin between, and there is gap in first temperature sensor and the fin and coil pipe, and described the
Two temperature sensors are arranged on the coil pipe, for detecting coil temperature, are provided with around the second temperature sensor
Insulating layer, for completely cutting off it with ambient air, the third temperature sensor is for detecting environment temperature, the heat pump
System carries out defrosting control according to defrosting control method documented by any bar of front.
Compared with prior art, the advantages and positive effects of the present invention are: defrosting control method of the invention, passes through detection
Air themperature Ts at evaporator refrigerant inlet position should in system heating operation and evaporator surface generation frosting
Last frosting at position, and temperature of the position before non-frosting be close to environment temperature, flows and surrounding air in coil pipe
The low temperature refrigerant of heat exchange, so the temperature difference △ T1 between the air themperature Ts measured and coil temperature Tg is larger, with environment temperature
The absolute value △ T2 of difference between Ta is smaller, when there is frosting, for detecting the sensor of air themperature Ts by by frost layer
Covering, and frost layer is in close contact with coil pipe, so the difference between air themperature Ts rapid drawdown detected, with coil temperature Tg
Value △ T1 substantially reduces, and the absolute value △ T2 of the difference between environment temperature Ta is significantly increased, and this programme is judged close with this
Frosting situation at evaporator refrigerant inlet position illustrates that entire fin has tied Man Shuan, so when frosting occurs in the position
Control system enters defrosting process afterwards, and the defrosting of this defrosting control method judges that mechanism is based on evaporimeter frosting process frost layer
Growth characteristic and the regularity of distribution, accuracy of judgement can be realized " defrosting on demand ", be not in that existing double temperature sensor method exists
The phenomenon that accidentally defrosting is frequently occurred under Cold and dry environment, substantially increases the Energy Efficiency Ratio and reliability of system operation.With it is other
Laser acquisition, photoelectric conversion Defrost method are compared, and the configuration of the present invention is simple is at low cost, are very easy to and existing heat pump system
In conjunction with popularization and use.
After the detailed description of embodiment of the present invention is read in conjunction with the figure, the other features and advantages of the invention will become more
Add clear.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of embodiment flow chart of defrosting control method proposed by the invention；
Fig. 2 is a kind of embodiment schematic diagram of heat pump system proposed by the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one, air source heat pump is in winter under the lower operating condition of environment temperature when heating operation, the finned tube of evaporator
Surface usually all can frosting, in Frost formation process, the distribution situation of fin surface frost layer is related with the temperature of fin pipe surface, and
The temperature of fin pipe surface is related with the fluid interchange characteristic of refrigerant.Studies have shown that when low temperature refrigerant flows in pipe, due to pipe
The pressure of the presence of wall friction resistance, refrigerant can be gradually reduced, theoretically, when turbulent frictional resistance pressure drop and fluid velocity square at
Direct ratio, so influence of the variation of refrigerant flow rate to frictional resistance pressure drop is very big, and the gas liquid ratio of the variation of refrigerant flow rate and refrigerant
Example is related, and ratio shared by liquid is bigger (quality is bigger), and refrigerant flow rate is smaller (usually between 0.5-1.0m/s), with liquid
The heat absorption of state refrigerant vaporizes, and ratio shared by gas is gradually increased, flow velocity gradually increase (usually in 2.0m/s or more), refrigerant
Pressure drop gradually increases, i.e. the evaporating temperature of refrigerant is gradually reduced, and the temperature corresponding to fin pipe surface is relatively low, easier knot
Frost, so finned tube temperature corresponding to general refrigerant (liquid) entrance is higher, often last frosting, refrigerant (gaseous state) outlet
The corresponding finned tube temperature in place is lower, often frosting at first, evaporator surface frosting when inventor does knot defrosting experiment early period
Uneven phenomenon also demonstrates this point.Therefore, the present embodiment is by detecting the air at evaporator refrigerant inlet position
Temperature Ts, at the position when non-frosting, air themperature Ts is flowed and surrounding air heat exchange in coil pipe close to environment temperature
Low temperature refrigerant, therefore the temperature difference between measured air themperature Ts and coil pipe is larger and smaller with the difference of environment temperature, when
When there is frosting, the sensor surface for detecting air themperature covers frost layer, therefore air themperature rapid drawdown detected, with
Difference between coil temperature substantially reduces, and the difference between environment temperature is significantly increased, and this programme is judged with this close to steaming
The frosting situation at device refrigerant inlet position is sent out, due to the close last frosting in evaporator refrigerant inlet position, if be judged herein
Illustrate that entire fin has tied Man Shuan for frosting, control system enters defrosting process then, specifically, the defrosting of the present embodiment controls
Method, as shown in Figure 1, comprising the following steps:
S1, air themperature Ts, coil temperature Tg at the evaporator refrigerant inlet position are detected according to period t and far from steaming
Send out the environment temperature Ta at device position；
Between S2, the difference △ T1 for calculating air themperature Ts and coil temperature Tg and calculating environment temperature Ta and air themperature Ts
Difference △ T2；
If S3, △ T1 are no more than the first given threshold and △ T2 is not less than the second given threshold, defrosting control logic is executed, it is no
Then, defrosting control logic is not executed.
As shown in Fig. 2, the evaporator in the present embodiment includes coil pipe 11 and the coil pipe 12 that is fixed on fin 11, in fin
11 and the side of coil pipe be additionally provided with blower (not shown), fin 11 and coil pipe 12 are mutually perpendicular to composition finned tube, blower
Positioned at the side of fin 11 and coil pipe 12, suction air flow crosses fin tube structure when fan operation, with the low temperature cold in coil pipe 12
Matchmaker exchanges heat, and the flow direction of refrigerant is as shown by arrows in heat pump system heating operations, and it is last that the first temperature sensor 13 is placed in evaporator
The position of frosting, it is preferred that the first temperature sensor 13 is being provided at evaporator refrigerant inlet position, the first temperature passes
Sensor 13 is placed in the gap of adjacent two panels fin 11, and the first temperature sensor 13 not fin 11 and copper pipe 12 with the position
It is in contact, second temperature sensor 14 is provided on coil pipe 12, be provided with third temperature sensor 15 at separate evaporator position,
For detecting environment temperature, position of the second temperature sensor 14 for detecting coil temperature, where the first temperature sensor 13
When non-frosting, air is flowed through herein under the drive of blower, therefore the first temperature sensor 13 is cold close to evaporator for detecting
Air themperature at matchmaker entry position, value Ts and environment temperature Ta are close, and the absolute value △ T2 of the difference between the two is generally 0 ~ 2
DEG C, larger with the difference △ T1 of coil temperature Tg, generally 7 ~ 12 DEG C, when the position frosting, frost layer is led to air circulation
Road blocking, the first temperature sensor are covered by frost layer, and temperature detected is the temperature of frost layer, and frost layer closely connects with coil pipe
Touching is so the difference △ T1 between its value and coil temperature Tg substantially reduces, and generally 1 ~ 3 DEG C, it is preferred that the first given threshold
2 DEG C are taken, the absolute value △ T2 of the difference between environment temperature Ta is significantly increased, and generally 5 ~ 10 DEG C, it is preferred that the second setting
Threshold value takes 5 DEG C.First temperature sensor 13 of the present embodiment is different from existing environment temperature sensor, due to its setting
Specific position, temperature change detected can directly reactive evaporation device whether tie Man Shuan, and existing environment temperature sensor is remote
From evaporator and position it is any, no matter under any state of evaporator, detection be for reactive evaporation device air inlet temperature
The environment temperature of degree.
The defrosting of defrosting control method judges that mechanism is that the growth based on evaporimeter frosting process frost layer is special in the present embodiment
Point and the regularity of distribution, accuracy of judgement can be realized " defrosting on demand ", be not in that existing double temperature sensor method is dry in cold
The phenomenon that accidentally defrosting is frequently occurred under dry environment, substantially increases the Energy Efficiency Ratio and reliability of system operation.It is visited with other laser
The defrosting control methods such as survey, photoelectric conversion are compared, and the configuration of the present invention is simple is at low cost, are very easy to and existing heat pump system
In conjunction with popularization and use.
As a preferred embodiment, the method that period t is determined according to the relative humidity φ of the air are as follows:
As relative humidity φ < m1, period t value 0 does not detect environment temperature Ts,
As m1≤φ < m2, period t value t1,
As m2≤φ < m3, period t value t2,
As m3≤φ < m4, period t value t3,
As φ >=m4, period t value t4；
Wherein, 0 < m1 < m2 < m3 < m4 < 1, t1 > t2 > t3 > t4 > 0.
Studies have shown that the relative humidity of air has significant impact to frosting rate, relative humidity is bigger, frosting rate
Faster, shorter corresponding to detection cycle of the temperature sensor for temperature detection, the humidity of China different regions is different, same
The humidity of regional every day is also variation, and therefore, this step passes through the relative humidity φ of detection evaporator air inlet air,
And detection cycle t is determined according to the relative humidity φ, so that detection cycle t is suitable for any area, any psychrometric condition
Lower work, to improve the accuracy of this control method.
The mode that the relative humidity of above-mentioned air and the corresponding relationship of detection cycle can be made into look-up table is stored in memory, is
When system heating operation, humidity sensor constantly detects the relative humidity of air, and searches temperature detection corresponding to current humidity
Cycle T.Preferably, m1 takes 50%, T to take 0；M2 takes 65%, T to take 10 minutes；M3 takes 80%, T to take 7 minutes；M4 takes 95%, T to take 4
Minute.
It further include the step to system continuous heating runing time timing before step S1 as a preferred embodiment
Suddenly, wherein system refers to air source heat pump system, in step S3, if the temperature gap in step S2 is not more than the first given threshold
And system continuous heating runing time is not less than the first setting time, then system enters defrosting process.It is fast due to frosting rate
Slowly there is direct relation with air humidity, studies have shown that the relative humidity of air is bigger, frosting rate is faster, even if opposite
Under operating condition of the humidity greater than 95%, the full frost of evaporator surface knot is also obtained 40 minutes or more, it is advantageous to, the first setting time can
It is set as 40 minutes, that is to say, that system, which at least wants continuous heating to run, could issue defrosting instruction for 40 minutes, thus further
Improve the accuracy of this defrosting control method.
There are many Defrost modes, such as reverse cycle defrosting, hot gas bypass defrosting, electric heated defrosting, no matter is removed using which kind of
White mode belongs to the protection scope of this patent when judging to enter the condition of defrosting as system using this defrosting control method.
Further include the steps that judging current air temperature Ts in step S3, if meeting current air temperature Ts simultaneously is greater than the
One set temperature and less than the second set temperature, then system enters defrosting process.Studies have shown that evaporator is in environment temperature -10
DEG C ~ 5 DEG C between when be possible to frosting, it is super go beyond the scope substantially will not frosting, corresponding frost layer temperature is -15 DEG C ~ 0 DEG C,
Preferably, the first set temperature may be set to -15 DEG C, and the second set temperature may be set to 0 DEG C, may be that there are it in step S3
His unexpected situation causes different moments difference in air temperature detected to meet the condition into defrosting process, accidentally removes to cause
Frost, this step solves the problems, such as this by the judgement of further condition, to improve the accuracy of this defrosting control method.
If current air temperature Ts is greater than third set temperature and when less than the 4th set temperature, compressor stops fortune
The fan of row, evaporator operates normally, it is preferred that third set temperature is -5 DEG C, and the 4th set temperature is 0 DEG C, that is, works as environment
For temperature between 1 DEG C ~ 5 DEG C when (corresponding frost layer temperature is -5 DEG C ~ 0 DEG C), the present invention utilizes the heat nature defrosting in environment,
Defrosting energy consumption can be greatly reduced (defrosting energy is only the wasted work of blower, considerably less).
It further include judging current air temperature Ts when system defrosting process is inverse circulation or hot gas bypass defrosting mode
Step, during defrosting, with the thawing of frost layer around temperature sensor, air themperature starts to increase, when temperature is more than the 5th
When set temperature, illustrate that the frost layer of evaporator surface is all melted, i.e. defrosting process terminates.Rule of thumb, it is preferred that the
Five set temperatures are 20 DEG C desirable.
System enters in the third setting time after defrosting process (inverse circulation or hot gas bypass defrosting mode), further includes
The step of calculating current air temperature Ts change rate, if current air temperature Ts change rate is greater than the second given threshold, system
Exit defrosting process.When system occurs accidentally to defrost, since, without frost, temperature is very short around the first temperature sensor 13
Time in will rise it is very high, it is preferred that 20 DEG C are increased in 5s, i.e. the second given threshold is 4, the step can effectively solve be
The problem of system accidentally defrosts because occurring and breaks down.When other defrostings that defrosting process is non-inverse circulation and hot gas bypass defrosting
Enter defrosting process when mode, in step S3 to further include the steps that carrying out timing to defrosting duration later, if defrosting duration is not small
In the second setting time, then system exits defrosting process, restores normal heating operations.Such Defrost mode can be removed by fixation
White duration, experiments verify that the frost layer of evaporator surface can substantially remove when meeting certain defrosting duration.Second setting
Time can set based on experience value, for example, can set 10 minutes, certainly, can be set, be not limited to the present embodiment according to actual state
It is middle to be illustrated.
Only in a heating mode, and outdoor environment temperature is in (generally -10 DEG C of a certain range to air source heat pump system
~ 5 DEG C) when, frosting is possible to, namely just need the control that defrosts, further includes judging currently to run mould before step S1 therefore
The step of formula, if being judged as, present mode of operation is indoor heating mode, thens follow the steps S1~S3.It otherwise, is not indoor system
Heat pattern, corresponding without executing step S1~S3, it is system that air themperature Ts detected, which can be used as outdoor environment temperature, at this time
It is used.
Embodiment two, the present embodiment propose a kind of air source heat pump system, including compressor, evaporator, evaporator packet
The coil pipe 12 for including coil pipe 11 and being fixed on fin 11 is additionally provided with blower in the side of fin 11 and coil pipe and (does not show in figure
Out), fin 11 and coil pipe 12 are mutually perpendicular to composition finned tube, and blower is located at the side of fin 11 and coil pipe 12, when fan operation
Suction air flow crosses fin tube structure, exchanges heat with the low temperature refrigerant in coil pipe 12, the flow direction of refrigerant in heat pump system heating operations
As shown by arrows, the first temperature sensor 13 is being provided at the evaporator refrigerant inlet position, the is provided on coil pipe 12
Two temperature sensors 14, temperature surface and the coil pipe of second temperature sensor 14 fit closely, for detecting coil temperature, the second temperature
Be provided with insulating layer 17 around degree sensor 14, for itself and ambient air to be completely cut off, prevent its detect temperature by
The interference of environment temperature, the realization of the material with heat insulation function, such as heat-preservation cotton can be used in insulating layer 17, far from evaporator position
Place is provided with third temperature sensor 15, and for detecting environment temperature, second temperature sensor 14 is used to detect coil temperature, the
One temperature sensor 13 is placed in the position of the last frosting of evaporator, and the first temperature sensor 13 is placed between adjacent two panels fin 11
In gap, and the first temperature sensor 13 is not in contact with the fin 11 of the position and copper pipe 12, and the humidity sensor is set to
The air inlet of the evaporator, the heat pump system carry out defrosting control according to defrosting control method documented by any bar of front
System.
Evaporator air inlet is provided with humidity sensor 16, for detecting the air humidity φ of evaporator air inlet,
For determining period t.
For those of ordinary skill in the art it is to be understood that the refrigerant flow circuit of general wind-cooled evaporator is divided into multichannel,
And what Fig. 2 was provided is only that the process of refrigerant and corresponding fin tube structure, the present invention apply to of different sizes all the way
When in evaporator, the position that temperature sensor is put be would also vary from, such as the system of existing small-sized household heat pump air conditioner
Make producer to save cost, it (is normally using dedicated that the liquid separation of evaporator, which is typically all using multiple threeway parallel connection liquid separations,
Dispenser liquid separation, but price is more expensive, typically Large-scale machine set use), so will lead to liquid separation unevenness, i.e., per refrigerant all the way
Flow is different, and the local wind rate of evaporator surface will be different the combined influence of (influence of blower fan structure) in addition, finally lead
Middle part and the last frosting in top are caused, the experimental result that inventor does also demonstrates this point, so defrosting provided by the invention
When control method is mainly used on small-sized household air conditioner, temperature sensor is preferably placed on the middle part and top of evaporator,
For other kinds of unit, temperature sensor can be arranged in the position of last frosting according to the practical frosting situation of evaporator
It sets.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the those of ordinary skill in domain is made within the essential scope of the present invention, also should belong to this hair
Bright protection scope.
Claims (11)
1. a kind of defrosting control method, which comprises the following steps:
(1), air themperature Ts, coil temperature Tg at the evaporator refrigerant inlet position and separate are detected according to period t
Environment temperature Ta at evaporator position；
(2), the difference △ T1 of air themperature Ts and coil temperature Tg are calculated and calculate environment temperature Ta and air themperature Ts it
Between difference △ T2；
(3) if, △ T1 is no more than the first given threshold and △ T2 is not less than the second given threshold, system enters defrosting process,
Otherwise, system runs heating operations.
2. defrosting control method according to claim 1, which is characterized in that further include detection evaporator before step (1)
The step of air humidity φ of air inlet, and period t is determined according to the air humidity φ.
3. defrosting control method according to claim 2, which is characterized in that determine period t according to the air humidity φ
Method are as follows:
As air humidity φ < m1, period t value 0 does not detect environment temperature Ts,
As m1≤φ < m2, period t value t1,
As m2≤φ < m3, period t value t2,
As m3≤φ < m4, period t value t3,
As φ >=m4, period t value t4；
Wherein, 0 < m1 < m2 < m3 < m4 < 1, t1 > t2 > t3 > t4 > 0.
4. defrosting control method according to claim 1, which is characterized in that further include being run to system before step (1)
The step of time timing, step (3) if in meet system operation time simultaneously not less than the first setting time, execute defrosting control
Logic processed.
5. defrosting control method according to claim 1, which is characterized in that step further includes judging present air in (3)
The step of temperature Ts, when Ts is met certain condition simultaneously, system just can enter defrosting process, and otherwise, system operation heated
Journey, if current air temperature Ts is greater than the first set temperature and less than the second set temperature, system enters defrosting process,
In, the first set temperature is less than the second set temperature.
6. defrosting control method according to claim 5, which is characterized in that if current air temperature Ts is set greater than third
Temperature and when less than the 4th set temperature, system enters defrosting process, then compressor is out of service, and the fan of evaporator is normally transported
Row, wherein third set temperature is greater than the first set temperature and less than the 4th set temperature.
7. defrosting control method according to claim 1-6, which is characterized in that the defrosting process of system is inverse follows
When ring Defrost mode or hot gas bypass defrosting mode, further include the steps that judging current air temperature Ts, if current air temperature
Ts is greater than the 5th set temperature, then system defrosting process terminates, and restores normal heating operations, wherein the 5th set temperature is big
In 0.
8. defrosting control method according to claim 7, which is characterized in that in step (3) system enter defrosting process it
In third setting time afterwards, further include the steps that calculating current air temperature Ts change rate, if current air temperature Ts changes
Rate is greater than the second given threshold, then system exits defrosting process.
9. defrosting control method according to claim 1-6, which is characterized in that when the defrosting process of system is inverse
Enter after defrosting process progress when further including to defrosting when other Defrost modes except circulating defrosting mode, in step (3)
The step of row timing, if defrosting duration is not less than the second setting time, system exits defrosting process.
10. defrosting control method according to claim 1-6, which is characterized in that executing the control logic that defrosts
In the process, further include the steps that calculating current environmental temperature Ts change rate, if current environmental temperature Ts change rate is set greater than third
Determine threshold value, then stop compressor operation, evaporator fan operates normally.
11. a kind of air source heat pump system, including compressor, evaporator, the evaporator includes being connected to the compressor
Coil pipe and the fin fixed with the coil pipe, which is characterized in that further include the first temperature sensor and second temperature sensor
And third temperature sensor, first temperature sensor are set to when heating mode close to evaporator refrigerant inlet position
Place, positioned at adjacent two fin between, and there is gap in first temperature sensor and the fin and coil pipe, and described the
Two temperature sensors are arranged on the coil pipe, for detecting coil temperature, are provided with around the second temperature sensor
Insulating layer, for completely cutting off it with ambient air, the third temperature sensor is for detecting environment temperature, the heat pump
System carries out defrosting control according to defrosting control method documented by claim any one of 1-9.
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| CN110332652A (en) * | 2019-07-25 | 2019-10-15 | 宁波奥克斯电气股份有限公司 | A kind of defrosting control method, device and air conditioner |
| CN110940135A (en) * | 2019-12-09 | 2020-03-31 | 珠海格力电器股份有限公司 | Refrigerator and defrosting detection device and defrosting control method thereof |
| CN111089393A (en) * | 2019-12-12 | 2020-05-01 | 珠海格力电器股份有限公司 | Intelligent defrosting method and device for air cooler and controller |
| CN111947350A (en) * | 2019-05-14 | 2020-11-17 | 广东万博电气有限公司 | Defrosting control method, defrosting control system and air source heat pump device |
| CN112781287A (en) * | 2020-07-28 | 2021-05-11 | 青岛海尔新能源电器有限公司 | Defrosting method and water heater |
| CN112902513A (en) * | 2021-01-27 | 2021-06-04 | 山东创佳新能源科技有限公司 | Defrosting control method and system of air source heat pump |
| CN114440448A (en) * | 2022-03-01 | 2022-05-06 | 浙江乾丰智能科技有限公司 | Air energy water heater defrosting method based on vibration and heat energy defrosting |
| CN114459151A (en) * | 2022-03-01 | 2022-05-10 | 浙江乾丰智能科技有限公司 | Air energy water heater defrosting method based on piezoelectric deformation and heat energy defrosting |
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| CN112902513A (en) * | 2021-01-27 | 2021-06-04 | 山东创佳新能源科技有限公司 | Defrosting control method and system of air source heat pump |
| CN112902513B (en) * | 2021-01-27 | 2022-05-17 | 山东创佳新能源科技有限公司 | Defrosting control method and system of air source heat pump |
| CN114459151A (en) * | 2022-03-01 | 2022-05-10 | 浙江乾丰智能科技有限公司 | Air energy water heater defrosting method based on piezoelectric deformation and heat energy defrosting |
| CN114659268A (en) * | 2022-03-01 | 2022-06-24 | 浙江乾丰智能科技有限公司 | Method for predicting frosting degree of air energy water heater |
| CN114440448A (en) * | 2022-03-01 | 2022-05-06 | 浙江乾丰智能科技有限公司 | Air energy water heater defrosting method based on vibration and heat energy defrosting |
| CN114440448B (en) * | 2022-03-01 | 2023-09-19 | 温岭煌格科技咨询有限公司 | Defrosting method of air energy water heater based on vibration and thermal energy defrosting |
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| CN114659268B (en) * | 2022-03-01 | 2023-10-03 | 温岭煌格科技咨询有限公司 | Method for predicting frosting degree of air energy water heater |
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