CN106403422A - Defrosting start point judgment method and defrosting start point judgment system for multi-loop heat exchanger of air source heat pump - Google Patents
Defrosting start point judgment method and defrosting start point judgment system for multi-loop heat exchanger of air source heat pump Download PDFInfo
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- CN106403422A CN106403422A CN201610846163.0A CN201610846163A CN106403422A CN 106403422 A CN106403422 A CN 106403422A CN 201610846163 A CN201610846163 A CN 201610846163A CN 106403422 A CN106403422 A CN 106403422A
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- 238000010257 thawing Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000005259 measurement Methods 0.000 claims abstract description 25
- 125000003367 polycyclic group Chemical group 0.000 claims description 36
- 239000003507 refrigerant Substances 0.000 claims description 32
- 238000001514 detection method Methods 0.000 claims description 5
- 239000002699 waste material Substances 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000012356 Product development Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000013383 initial experiment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- F25B47/02—Defrosting cycles
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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
- 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
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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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
- F25B2347/023—Set point defrosting
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2103—Temperatures near a heat exchanger
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2106—Temperatures of fresh outdoor air
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Abstract
The invention provides a defrosting start point judgment method for a multi-loop heat exchanger of an air source heat pump. The defrosting start point judgment method comprises the following steps: calculating a frosting critical value A according to an overall heat exchange amount of outdoor heat exchangers; acquiring a coil pipe temperature Ttube of the outdoor heat exchanger in each loop and the dry-bulb temperature Ta of outdoor air; calculating an EMF value of each outdoor heat exchanger according to the coil pipe temperature Ttube and the dry-bulb temperature Ta; and counting the amount of the outdoor heat exchangers of which the EMF values are smaller than or equal to the frosting critical value A, and starting a defrosting mode if the amount is larger than a half of the amount of all outdoor heat exchangers so that the indoor heat is reversely transmitted to the outdoor environment in order to remove the frost on the outdoor heat exchangers. In a normal running process, the heat exchange amount needs not to be calculated repeatedly, and only the index of temperature needs to be measured. The method disclosed by the invention has the advantages of fully considering the characteristics of the multi-loop heat exchanger, realizing accurate measurement results and avoiding waste of energy. The invention also provides a defrosting start point judgment system for the multi-loop heat exchanger of the air source heat pump, and the system can realize the same technical effects.
Description
Technical field
The present invention relates to air source heat pump technical field, it is furthermore to be related to a kind of many loops of air source heat pump to change
Hot device defrosting starting point decision method and system.
Background technology
Heat pump be a kind of make heat flow to the energy saver of high-order thermal source from low level heat energy using high potential, have widely
Application scenarios and huge market value.Air source heat pump has thermal source and obtains convenience, efficiency high, simple to operate, pollution-free etc.
Plurality of advantages, has obtained extensive concern and application.
Air source heat pump in the winter time heating operation when, outdoor air side heat exchanger plays the effect of evaporimeter, due to evaporation temperature
Degree is relatively low, and the temperature of heat exchanger surface also declines therewith, even below 0 DEG C, when outdoor air flows through heat exchanger coils, its institute
The moisture containing will separate out formation frost layer, and progressively thickening frost layer increased thermal conduction resistance, makes to flow through the air mass flow of heat exchanger
It is greatly reduced, and then reduce the heat transfer coefficient of heat exchanger.Thickening with frost layer, finally will appear from evaporating temperature and declines, makes
Heat declines, fan performance decay, and then affects the overall heating efficiency of system, shutdown occurs, unit cannot be just when serious
Often work.It is thus desirable to operation that outdoor heat exchanger is periodically defrosted, mainly use reverse cycle defrosting at present.
When air source heat pump is with reverse cycle defrosting mode operation, indoor heat exchanger is changed by the condenser under Heating State
Take heat for evaporimeter from interior, the evaporimeter under Heating State for the outdoor heat exchanger is changed into condenser to outdoor heat release.For keeping away
Exempt from the unnecessary waste of the energy it is necessary to choose appropriate defrosting starting point decision method.Heat pump outdoor heat exchanger defrosts at present
The decision method of initial point mainly has time criterion, Time-temperature criterion, pressure criterion, optics criterion etc., when wherein
Between criterion and Time-temperature criterion application the most universal.All multi-method generally existing reference indexs are excessive above, physics
The problems such as parameter measurement bigger error, detecting instrument high expensive.
In view of this, Korea S scholar Min-Hwan Kim and Kwan-Soo Lee in recent years propose one kind sentenced based on temperature index
Determine EMF method (the Determination method of defrosting start-time of air source heat pump defrosting starting point
based on temperature measurements,Applied Energy).The method is by entering to outdoor heat exchanger
Outlet refrigerant temperature and the measurement of air themperature, the heat exchange amount realizing outdoor heat exchanger with outdoor air calculates, and then realizes
The real-time monitoring of this heat exchange amount, and defrosting starting point is drawn by analytical calculation.
Further extensive with air source heat pump application, the physical dimension of its heat exchanger also obtains Continuous optimization, of today
Net for air-source heat pump units outdoor heat exchanger is all using many loop version.Frosting situation due to outdoor polycyclic pipeline heat exchanger is changed
The impact of the factor such as cold-producing medium distribution and its outside air distribution and flow inside hot device, the frosting degree on its surface is often and uneven
Even, namely there is " non-homogeneous frosting " phenomenon that the frosting degree on each loop surface differs.When this EMF method be applied to non-homogeneous
During frosting condition, by measurement and the analysis of the overall import and export refrigerant temperature of outdoor heat exchanger and air themperature, actually
It is difficult to the accurate judgement to frosting situation.EMF method is difficult to avoid that the mistake that non-homogeneous frosting leads to is removed in actual applications
Frost.And traditional time criterion and Time-temperature criterion do not simply fail to solve because of the uneven institute of polycyclic pipeline heat exchanger frosting
The mistake defrosting phenomenon causing, starts defrosting when being also easy to frostless, and the operation having delay start defrosting when frost is lost
Phenomenon, has a strong impact on the normal operation of heat pump, has in turn resulted in substantial amounts of energy dissipation by mistake.Therefore, develop one kind extensively
It is applied to the defrosting starting point decision method of polycyclic pipeline heat exchanger, not only there is important learning value, be also equipped with great reality
Border using value.
Content of the invention
The invention provides a kind of air source heat pump polycyclic pipeline heat exchanger defrosting starting point decision method and system, fully
Consider the feature of polycyclic pipeline heat exchanger, measurement result is accurate, it is to avoid the waste of the energy.Concrete scheme is as follows：
A kind of polycyclic pipeline heat exchanger of air source heat pump defrosts starting point decision method, including：
Overall heat exchange amount according to outdoor heat exchanger calculates frosting critical value A；
The coil temperature T of outdoor heat exchanger described in each loop is obtained under heat supply modetube, and outdoor air is dry
Ball temperature Ta；
According to described coil temperature TtubeWith described dry-bulb temperature TaCalculate the EMF value of each described outdoor heat exchanger；
Count the quantity that described EMF value is less than or equal to the described outdoor heat exchanger of described frosting critical value A, when quantity surpasses
Defrosting mode is opened during the half crossing all described outdoor heat exchangers (1).
Alternatively, described dry-bulb temperature TaInlet air temperature T including described outdoor heat exchangerA, inWith outlet air temperature
Degree TA, out, the computing formula of described EMF value is：
EMF=(Ta,in-Ta,out)/(Ta,in-Ttube)
Wherein, TA, inFor the inlet air dry-bulb temperature of described outdoor heat exchanger, TA, outFor going out of described outdoor heat exchanger
Mouth air dry-bulb temperature, TtubeCoil temperature for described outdoor heat exchanger.
Alternatively, described coil temperature TtubeAverage for described outdoor heat exchanger refrigerant inlet temperature and outlet temperature
Value.
Alternatively, described frosting critical value A is according to overall heat exchange amount Q of described outdoor heat exchanger and outdoor airtot?
Arrive.
Alternatively, when the heat that takes of described outdoor heat exchanger is described overall heat exchange amount QtotHalf when obtain described knot
White critical value A.
Alternatively, described inlet air dry-bulb temperature TA, inAverage for the multiple measurement point of described outdoor heat exchanger windward side
Temperature；Described outlet air dry-bulb temperature TA, outMean temperature for the multiple measurement point of described outdoor heat exchanger leeward side.
The present invention also provides a kind of air source heat pump polycyclic pipeline heat exchanger defrosting starting point decision-making system, including：
It is arranged at the dry-bulb temperature sensor on each outdoor heat exchanger fin；
It is arranged at the refrigerant temperature sensors on each described outdoor heat exchanger refrigerant tubing；
According to the detection numerical value of described dry-bulb temperature sensor and described refrigerant temperature sensors, calculate described outdoor and change
The controller of hot device EMF value, the described outdoor that described controller can analyze described EMF value described frosting critical value A of arrival is changed
The quantity of hot device, to judge whether to reach defrosting starting point.
Alternatively, described dry-bulb temperature sensor includes being arranged at entering on described outdoor heat exchanger air inlet side fin
Outlet air sensor on mouth air borne sensor and air outlet slit side fin；Described refrigerant temperature sensors include being arranged at
Inlet temperature sensor on described outdoor heat exchanger refrigerant inlet pipeline and described outdoor heat exchanger refrigerant outlet pipeline
On outlet temperature sensor.
Alternatively, described inlet air sensor, at least provided with two, is respectively arranged at described outdoor heat exchanger windward side
Diagonal position；Described outlet air sensor, at least provided with two, is respectively arranged at the right of described outdoor heat exchanger leeward side
Angle Position.
Alternatively, described dry-bulb temperature sensor and described refrigerant temperature sensors are thermocouple.
The starting point decision method the invention provides a kind of polycyclic pipeline heat exchanger of air source heat pump defrosts, includes following step
Suddenly：Overall heat exchange amount previously according to outdoor heat exchanger calculates frosting critical value A；Under heat supply mode, obtain room in each loop
The coil temperature T of external heat exchangertube, and the dry-bulb temperature T of outdoor aira；According to coil temperature TtubeWith dry-bulb temperature TaMeter
Calculate the EMF value of each outdoor heat exchanger；Statistics EMF value is less than or equal to the quantity of the outdoor heat exchanger of frosting critical value A, works as number
Amount exceedes opens defrosting mode during the half of all outdoor heat exchangers, the heat back transfer making interior, to outdoor, outdoor is changed
Frosting on hot device is removed.
Determine the critical value that defrosting starts in system initial launch, do not need repeatedly to calculate during normal operation
Heat exchange amount, only needs this index of measurement temperature, and measurement process is simple.Can avoid running in Temperature-time decision method " frostless
And defrost " and " how frost and do not remove " problem, substantially envisage the feature of polycyclic pipeline heat exchanger, measurement result is accurate, it is to avoid
The waste of the energy.
Additionally, the present invention also provides a kind of air source heat pump polycyclic pipeline heat exchanger defrosting starting point decision-making system, including：Dry
The structures such as ball temperature sensor, refrigerant temperature sensors and reversal valve, dry-bulb temperature sensor is arranged at each outdoor heat exchange
On device fin；Refrigerant temperature sensors are arranged on each outdoor heat exchanger refrigerant tubing；Reversal valve is according to dry-bulb temperature
The detected value of sensor and refrigerant temperature sensors changes cold-producing medium flow direction.This system can be realized same as described above
Technique effect.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
A kind of flow chart of specific embodiment for present invention defrosting starting point decision method for the Fig. 1；
Fig. 2 is structure and the operational mode schematic diagram of air source heat pump system；
Fig. 3 A is the windward side structural representation of Three links theory outdoor heat exchanger；
Fig. 3 B is the side structure schematic diagram of Three links theory outdoor heat exchanger；
Fig. 3 C is the lee face structural representation of Three links theory outdoor heat exchanger；
Fig. 4 is that air source heat pump system heating mode runs switching flow figure with defrosting mode.
Wherein：
Outdoor heat exchanger 1, dry-bulb temperature sensor 2, inlet air temperature sensor 21, outlet air temperature sensor
22nd, refrigerant temperature sensors 3, inlet temperature sensor 31, outlet temperature sensor 32, reversal valve 4, indoor heat exchanger 5, pressure
Contracting machine 6, liquid trap 7, electric expansion valve 8, check-valves 9, valve 10 is dried
Specific embodiment
The core of the present invention is to provide a kind of air source heat pump polycyclic pipeline heat exchanger defrosting starting point decision method and is
System, substantially envisages the feature of polycyclic pipeline heat exchanger, measurement result is accurate, it is to avoid the waste of the energy.
In order that those skilled in the art more fully understands technical scheme, below in conjunction with accompanying drawing and specifically
Embodiment, the polycyclic pipeline heat exchanger of air source heat pump of the application defrosting starting point decision method and system are carried out detailed
Introduce explanation.
As shown in figure 1, a kind of flow chart of the specific embodiment of starting point decision method that defrosts for the present invention.The present invention
The air source heat pump polycyclic pipeline heat exchanger defrosting starting point decision method providing, comprises the following steps：S1, change previously according to outdoor
The overall heat exchange amount of hot device 1 calculates frosting critical value A, and actual environment according to residing for outdoor heat exchanger 1 for frosting critical value A is true
Fixed, if thinking beginning frosting when low EMF value is less than or equal to A.S2, under heat supply mode, obtain each loop in outdoor heat exchanger 1
Coil temperature Ttube, also need to obtain the dry-bulb temperature T of outdoor air simultaneouslya, TtubeAnd TaSupplying hot-die for polycyclic pipeline heat exchanger
The numerical value of actual measurement when working under formula.S3, according to coil temperature TtubeWith dry-bulb temperature TaCalculate each outdoor heat exchanger 1
EMF value, obtains coil temperature TtubeWith dry-bulb temperature TaAfterwards, using this two values, counted in corresponding computing formula of submitting the article
Calculate, thus obtaining the EMF value of reality.S4, statistics EMF value are less than or equal to the quantity of the outdoor heat exchanger 1 of frosting critical value A,
And carry out step S5, judge EMF value is had family less than or equal to whether the quantity of the outdoor heat exchanger 1 of frosting critical value A exceedes
The half of external heat exchanger 1；If then carrying out step S6, opening defrosting mode, if otherwise returning to step S2.
It should be noted that between above-mentioned calculating process need at regular intervals, at set intervals respectively to each room
External heat exchanger 1 is once calculated, if EMF value is more than frosting critical value A, thinks normal, frosting；If EMF value is little
In or then think beginning frosting equal to frosting critical value A, now each outdoor heat exchanger 1 not necessarily all starts frosting, is spaced one section
Duplicate measurements after time, until half or more outdoor heat exchanger 1 EMF value be less than or equal to frosting critical value A, then make be
System enters defrosting mode.
When air source heat pump is with reverse cycle defrosting mode operation, indoor heat exchanger 5 is turned by the condenser under Heating State
It is changed into evaporimeter and takes heat from interior, the evaporimeter under Heating State for the outdoor heat exchanger 1 is changed into condenser to outdoor heat release.Pass
During system, mutually measuring chamber external heat exchanger and the temperature difference of outside air temperature to judge whether Time-temperature criterion at regular intervals
Need to enter defrosting mode, judge that point tolerance is larger, and the situation of " frostless and defrost " and " how white and do not remove " easily occurs.
The method of the present invention determines the critical value that defrosting starts in system initial launch, during normal operation not
Need repeatedly to calculate heat exchange amount, only need this index of measurement temperature, measurement process is simple.Temperature-time judgement side can be avoided
The problem running in method, substantially envisages the feature of polycyclic pipeline heat exchanger, and measurement result is accurate, it is to avoid the waste of the energy.
On this basis, the dry-bulb temperature T adopting in the present inventionaInlet air temperature T including outdoor heat exchanger 1A, inWith
Outlet air temperature TA, outTwo parameters, according to this two Parameters Calculation EMF values, computing formula is as follows：
EMF=(Ta,in-Ta,out)/(Ta,in-Ttube) (1)
Wherein, TA, inFor the inlet air dry-bulb temperature of outdoor heat exchanger 1, TA, outOutlet air for outdoor heat exchanger 1
Dry-bulb temperature, TtubeCoil temperature for outdoor heat exchanger 1.After real-time EMF value is obtained according to above-mentioned formula, carry out with A
Relatively, to judge whether to start frosting.
Further, coil temperature TtubeMean value for outdoor heat exchanger 1 refrigerant inlet temperature and outlet temperature.?
It is respectively provided with refrigerant temperature sensors 3, with mean value on outdoor heat exchanger 1 inlet pipeline of each loop and outlet conduit
As coil temperature TtubeMake judged result more accurate.
Further, frosting critical value A is according to overall heat exchange amount Q of outdoor heat exchanger 1 and outdoor airtotObtain.Specifically
Ground, when the heat that takes of outdoor heat exchanger 1 is overall heat exchange amount QtotHalf when obtain frosting critical value A.
Specifically, it is calculated by below equation：
Qtot=(Qa+Qr)/2 (2)
Wherein, QaFor the full heat of air, including sensible heat part and latent heat part；QrImport and export enthalpy difference for cold-producing medium.Qa
Computing formula be：
QrComputing formula be：
In formula (2) and formula (3), Cp,aFor the specific heat of outdoor air, LhFor the latent heat of vaporization of water, wA, in, wA, outIt is respectively room
External heat exchanger imports and exports the absolute humidity of air.
Simultaneous formula (1-4), draws overall heat exchange amount Q of outdoor polycyclic pipeline heat exchangertot, and EMF value.When outdoor is many
The heat that takes of loop heat exchanger rapidly lowers, and by for maximum half when, have：
Temperature parameter according to initial experiment loop and environment temperature and humidity condition, can calculate according to formula (1-5)
The EMF=A installing to this loop, this is the default decision content of the defrosting mode starting point of this loop.
In addition, the monitor in real time temperature data of each loop to outdoor polycyclic pipeline heat exchanger for the program setting control system is carried out
Calculate real-time EMF value.If this polycyclic pipeline heat exchanger loop number is n, meet EMF≤A when there being the individual loop in (n+1)/2 (rounding)
During this condition, air source heat pump system enters defrosting mode.
Further, inlet air dry-bulb temperature TA, inMean temperature for the multiple measurement point of outdoor heat exchanger 1 windward side；
Outlet air dry-bulb temperature TA, outMean temperature for the multiple measurement point of outdoor heat exchanger 1 leeward side.In outdoor heat exchanger 1 windward
Side and leeward side arrange multiple measurement points, and the result of each measurement point is averaged.
Additionally, present invention also offers a kind of air source heat pump polycyclic pipeline heat exchanger defrosting starting point decision-making system, such as Fig. 2
Shown, it is structure and the operational mode schematic diagram of air source heat pump system.This system includes dry-bulb temperature sensor 2, cold-producing medium
The structures such as temperature sensor 3, controller and reversal valve 4, in the present invention, reversal valve 4 is preferably by four-way change-over valve.Wherein, do
Ball temperature sensor 2 is arranged on each outdoor heat exchanger 1 fin；Refrigerant temperature sensors 3 are arranged at each outdoor heat exchange
On device 1 refrigerant tubing；Controller is according to the detection numerical value of dry-bulb temperature sensor 2 and refrigerant temperature sensors 3, counting chamber
The EMF value of external heat exchanger 1, controller can analyze the quantity that EMF value reaches the outdoor heat exchanger 1 of frosting critical value A, to judge
Whether arrival defrosting starting point.When reaching defrosting starting point, controller controls reversal valve 4 to change cold-producing medium flow direction, makes
Cold-producing medium flows in the opposite direction, and the heat of indoor heat exchanger 5 is transmitted to outdoor heat exchanger 1.
Specifically, dry-bulb temperature sensor 2 includes inlet air sensor 21 and outlet air sensor 22, inlet air
Sensor 21 is arranged on the fin of outdoor heat exchanger 1 air inlet side, and outlet air sensor 22 is arranged at outdoor heat exchanger 1
On the fin of air outlet slit side.Refrigerant temperature sensors 3 include inlet temperature sensor 31 and outlet temperature sensor 32, enter
Mouth temperature sensor 31 is arranged on the pipeline of outdoor heat exchanger 1 refrigerant inlet, and outlet temperature sensor 32 is arranged at outdoor
On the pipeline of heat exchanger 1 refrigerant outlet.The value of inlet temperature sensor 31 and outlet temperature sensor 32 measurement substitutes into formula
(1) calculate EMF value.
More specifically, inlet air sensor 21 is at least provided with two, it is respectively arranged at the right of outdoor heat exchanger 1 windward side
Angle Position；Outlet air sensor 22, at least provided with two, is respectively arranged at the diagonal position of outdoor heat exchanger 1 leeward side.As
Shown in Fig. 3 A to Fig. 3 C, represent windward side structure, side structure and the lee face structural representation of Three links theory outdoor heat exchanger respectively
Figure；The arrow of Fig. 3 A and Fig. 3 C represents the flow direction of cold-producing medium, and the arrow of Fig. 3 B represents the circulating direction of air.Two imports
Air borne sensor 21 is respectively arranged at the upper left corner and the lower right corner of outdoor heat exchanger 1 windward side；Two outlet air sensors 22
It is respectively arranged at the lower left corner and the upper right corner of outdoor heat exchanger 1 lee face.
Dry-bulb temperature sensor 2 of the present invention and refrigerant temperature sensors 3 are thermocouple, can examine in real time
Thermometric angle value.
As shown in Fig. 2 also including indoor heat exchanger 5, compressor 6, liquid trap 7, electric expansion valve 8, check-valves 9, being dried
The structures such as valve 10.As shown in figure 4, running switching flow figure for air source heat pump system heating mode with defrosting mode.Open heat
Pumping system, is first run with heat supply mode, outdoor temperature too low heat exchanger frosting, carries out Data Detection through thermocouple, work as controller
When judging to need defrosting using EMF method, commutated by four-way change-over valve, air source heat pump system is run with defrosting mode, outdoor
Heat exchanger defrosting, then through thermocouple Data Detection, when controller judges that outdoor line temperature reaches setting value, defrosting process is complete
Finish, commutated by four-way change-over valve, air source heat pump system is run with heat supply mode.
The present invention passes through to arrange temperature point, the present invention in the cold-producing medium of each loop of polycyclic pipeline heat exchanger and air ports
Accompanying drawing is illustrated with the heat exchanger of three loops.By heat exchange amount monitor in real time and the meter of outdoor heat exchanger 1 and outdoor air
Point counting is analysed, and determines whether each loop reaches the critical condition that defrosting starts, and finally realizes sentencing of air source heat pump defrosting starting point
Fixed.
In system initial launch, need the heat exchange amount by analyzing outdoor heat exchanger 1 and air, so that it is determined that frosting is faced
Dividing value A, it is not necessary to repeatedly calculate heat exchange amount in its normal course of operation, only needs this index of measurement temperature, measuring apparatus are pacified
Dress is simple, and system initial cost and operating cost are low.
The present invention is based on EMF defrosting decision method, in conjunction with actual conditions, has taken into full account the feature of polycyclic pipeline heat exchanger,
The uneven mistake defrosting problem causing of polycyclic pipeline heat exchanger frosting can be prevented effectively from.This method and system do not need setting time
Parameter, thus the time can be avoided to judge and Temperature-time decision method in " frostless and defrost " that run into and " how white and not
Remove " mistake defrosting problem, it is to avoid the waste of system capacity.
The present invention passes through Real-time Collection and its logical calculated analysis of temperature, it is possible to achieve polycyclic pipeline heat exchanger frosting degree
Monitor in real time, effectively reduces the probability of defrosting by mistake.The system of concurrently facilitating realizes automatically cutting of heat supply mode and defrosting mode
Change, high degree of automation, provide reference and reference for intelligent product development.
The air source heat pump polycyclic pipeline heat exchanger defrosting starting point decision-making system that the present invention provides is based on temperature survey, with now
Some defrosting starting point decision methods are compared, and measurement device type is single, it is simple to install, and initial cost and operating cost are low；Pass through
The temperature monitoring of each loop and logic analysis, can effectively improve frosting monitoring precision, it is to avoid mistake when frostless defrosts and has
Time delay defrosting phenomenon when white；Whole system is reasonable in design efficiently, without producing additional drag, is taken up space little, after installation
Do not interfere with the normal operation of air source heat pump system；For the design of polycyclic pipeline heat exchanger, uneven frosting can be prevented effectively from
When mistake defrosting phenomenon, there is very high engineering application value.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple modifications to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle, can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, this
Bright be not intended to be limited to the embodiments shown herein, and be to fit to and principles disclosed herein and features of novelty phase
Consistent scope the widest.
Claims (10)
1. a kind of air source heat pump polycyclic pipeline heat exchanger defrosting starting point decision method is it is characterised in that include：
Overall heat exchange amount according to outdoor heat exchanger (1) calculates frosting critical value A；
The coil temperature T of outdoor heat exchanger (1) described in each loop is obtained under heat supply modetube, and the dry bulb of outdoor air
Temperature Ta；
According to described coil temperature TtubeWith described dry-bulb temperature TaCalculate the EMF value of each described outdoor heat exchanger (1)；
Count the quantity that described EMF value is less than or equal to the described outdoor heat exchanger (1) of described frosting critical value A, when quantity surpasses
Defrosting mode is opened during the half crossing all described outdoor heat exchangers (1).
2. air source heat pump according to claim 1 polycyclic pipeline heat exchanger defrosting starting point decision method it is characterised in that
Described dry-bulb temperature TaInlet air temperature T including described outdoor heat exchanger (1)A, inWith outlet air temperature TA, out, described
The computing formula of EMF value is：
EMF=(Ta,in-Ta,out)/(Ta,in-Ttube)
Wherein, TA, inFor the inlet air dry-bulb temperature of described outdoor heat exchanger (1), TA, outFor described outdoor heat exchanger (1)
Outlet air dry-bulb temperature, TtubeCoil temperature for described outdoor heat exchanger (1).
3. air source heat pump according to claim 2 polycyclic pipeline heat exchanger defrosting starting point decision method it is characterised in that
Described coil temperature TtubeMean value for described outdoor heat exchanger (1) refrigerant inlet temperature and outlet temperature.
4. air source heat pump according to claim 3 polycyclic pipeline heat exchanger defrosting starting point decision method it is characterised in that
Described frosting critical value A is according to overall heat exchange amount Q of described outdoor heat exchanger (1) and outdoor airtotObtain.
5. air source heat pump according to claim 4 polycyclic pipeline heat exchanger defrosting starting point decision method it is characterised in that
When the heat that takes of described outdoor heat exchanger (1) is described overall heat exchange amount QtotHalf when obtain described frosting critical value A.
6. air source heat pump according to claim 4 polycyclic pipeline heat exchanger defrosting starting point decision method it is characterised in that
Described inlet air dry-bulb temperature TA, inMean temperature for the multiple measurement point of described outdoor heat exchanger (1) windward side；Described go out
Mouth air dry-bulb temperature TA, outMean temperature for the multiple measurement point of described outdoor heat exchanger (1) leeward side.
7. a kind of air source heat pump polycyclic pipeline heat exchanger defrosting starting point decision-making system is it is characterised in that include：
It is arranged at the dry-bulb temperature sensor (2) on each outdoor heat exchanger (1) fin；
It is arranged at the refrigerant temperature sensors (3) on each described outdoor heat exchanger (1) refrigerant tubing；
According to the detection numerical value of described dry-bulb temperature sensor (2) and described refrigerant temperature sensors (3), calculate described outdoor
The controller of heat exchanger (1) EMF value, described controller can analyze the described room that described EMF value reaches described frosting critical value A
The quantity of external heat exchanger (1), to judge whether to reach defrosting starting point.
8. air source heat pump according to claim 7 polycyclic pipeline heat exchanger defrosting starting point decision-making system it is characterised in that
The inlet air that described dry-bulb temperature sensor (2) includes being arranged on described outdoor heat exchanger (1) air inlet side fin passes
Outlet air sensor (22) on sensor (21) and air outlet slit side fin；Described refrigerant temperature sensors (3) include setting
It is placed in the inlet temperature sensor (31) on described outdoor heat exchanger (1) refrigerant inlet pipeline and described outdoor heat exchanger (1)
Outlet temperature sensor (32) on refrigerant outlet pipeline.
9. air source heat pump according to claim 8 polycyclic pipeline heat exchanger defrosting starting point decision-making system it is characterised in that
Described inlet air sensor (21), at least provided with two, is respectively arranged at the diagonal bits of described outdoor heat exchanger (1) windward side
Put；Described outlet air sensor (22), at least provided with two, is respectively arranged at the diagonal of described outdoor heat exchanger (1) leeward side
Position.
10. the polycyclic pipeline heat exchanger of air source heat pump according to claim 9 defrosts starting point decision-making system, and its feature exists
It is thermocouple in, described dry-bulb temperature sensor (2) and described refrigerant temperature sensors (3).
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| CN110793239A (en) * | 2019-10-10 | 2020-02-14 | 青岛新欧亚能源有限公司 | Large-scale air source heat pump frosting judgment and online defrosting system and method |
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| CN111879037A (en) * | 2020-08-04 | 2020-11-03 | 山东三土能源股份有限公司 | Air source heat pump water chilling unit frost suppression and defrosting equipment for different humidity and frost suppression and defrosting control method |
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