CN106403422B - A kind of polycyclic pipeline heat exchanger defrosting starting point determination method of air source heat pump and system - Google Patents
A kind of polycyclic pipeline heat exchanger defrosting starting point determination method of air source heat pump and system Download PDFInfo
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- CN106403422B CN106403422B CN201610846163.0A CN201610846163A CN106403422B CN 106403422 B CN106403422 B CN 106403422B CN 201610846163 A CN201610846163 A CN 201610846163A CN 106403422 B CN106403422 B CN 106403422B
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- 238000010257 thawing Methods 0.000 title claims abstract description 54
- 125000003367 polycyclic group Chemical group 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 239000003507 refrigerant Substances 0.000 claims description 40
- 238000004364 calculation method Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 5
- 239000002699 waste material Substances 0.000 abstract description 7
- 238000012546 transfer Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012356 Product development Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000013383 initial experiment 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
- 230000008719 thickening Effects 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
-
- 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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
- F25B2347/023—Set point defrosting
-
- 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
-
- 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
-
- 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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- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention provides a kind of polycyclic pipeline heat exchanger defrosting starting point determination methods of air source heat pump, comprising the following steps: calculates frosting critical value A according to the overall heat exchange amount of outdoor heat exchanger；Obtain the coil temperature T of outdoor heat exchanger in each looptubeAnd the dry-bulb temperature T of outdoor aira；According to coil temperature TtubeWith dry-bulb temperature TaCalculate the EMF value of each outdoor heat exchanger；The quantity for counting outdoor heat exchanger of the EMF value less than or equal to frosting critical value A opens defrosting mode when quantity is more than the half of all outdoor heat exchangers, makes indoor heat back transfer to outdoor, the frosting on outdoor heat exchanger is removed.It does not need to calculate heat exchange amount repeatedly during normal operation, need to only measure this index of temperature.The characteristics of substantially envisaging polycyclic pipeline heat exchanger, measurement result is accurate, avoids the waste of the energy.The present invention also provides a kind of polycyclic pipeline heat exchanger defrosting starting point decision-making system of air source heat pump, which may be implemented technical effect same as described above.
Description
Technical field
The present invention relates to air source heat pump technical fields, are furthermore to be related to a kind of polycyclic road of air source heat pump to change
Hot device defrosting starting point determination method and system.
Background technique
Heat pump be it is a kind of so that heat is flowed to from low level heat energy the energy saver of high-order heat source using high potential, have extensive
Application scenarios and huge market value.It is convenient, high-efficient, easy to operate, pollution-free etc. that there is air source heat pump heat source to obtain
Plurality of advantages has obtained extensive concern and application.
Air source heat pump in winter heating operation when, outdoor air side heat exchanger plays evaporator, due to evaporation temperature
To spend lower, the temperature of heat exchanger surface also declines therewith, and even lower than 0 DEG C, when outdoor air flows through heat exchanger coils, institute
The moisture contained will be precipitated to form frost layer, and the frost layer gradually to thicken increases thermal conduction resistance, make the air mass flow for flowing through heat exchanger
It is greatly reduced, thereby reduces the heat transfer coefficient of heat exchanger.With thickening for frost layer, evaporating temperature decline, system will finally occur
Heat decline, fan performance decaying, and then the heating efficiency of system entirety is influenced, it will appear shutdown when serious, unit can not be just
Often work.Therefore it needs to carry out outdoor heat exchanger periodically defrosting operation, at present mainly using reverse cycle defrosting.
When air source heat pump is with reverse cycle defrosting mode operation, indoor heat exchanger is changed by the condenser under Heating State
Heat is taken from interior for evaporator, outdoor heat exchanger is changed into condenser to outdoor heat release from the evaporator under Heating State.To keep away
Exempt from the unnecessary waste of the energy, it is necessary to choose appropriate defrosting starting point determination method.Heat pump outdoor heat exchanger defrosts at present
The main having time criterion of the determination method of initial point, time-temperature criterion, pressure criterion, optics criterion etc., wherein when
Between criterion and time-temperature criterion application it is the most universal.Above all generally existing reference indexs of multi-method are excessive, physics
The problems such as parameter measurement bigger error, detecting instrument high expensive.
In view of this, South Korea scholar Min-Hwan Kim and Kwan-Soo Lee proposes that one kind is sentenced based on temperature index in recent years
Determine EMF method (the Determination method of defrosting start-time of air source heat pump defrosting starting point
based on temperature measurements,Applied Energy).This method by outdoor heat exchanger into
The measurement of outlet refrigerant temperature and air themperature is realized that the heat exchange amount of outdoor heat exchanger and outdoor air calculates, and then is realized
The real-time monitoring of the heat exchange amount, and defrosting starting point is obtained by analytical calculation.
With air source heat pump application further extensively, the structure size of heat exchanger also obtains Continuous optimization, of today
Net for air-source heat pump units outdoor heat exchanger is all made of more loop versions.Since the frosting situation of outdoor polycyclic pipeline heat exchanger is changed
Refrigerant distribution and its influence of the factors such as outside air distribution and flow, the frosting degree on surface are often and uneven on the inside of hot device
It is even, namely there are different " non-homogeneous frosting " phenomenons of the frosting degree on each loop surface.When the EMF method is applied to non-homogeneous
When frosting condition, by the measurement and analysis of the inlet and outlet refrigerant temperature and air themperature of outdoor heat exchanger entirety, actually
It is difficult to realize the accurate judgement to frosting situation.EMF method is difficult to avoid that caused by non-homogeneous frosting in practical applications and accidentally removes
Frost.And traditional time criterion and time-temperature criterion does not simply fail to solve because of the uneven institute of polycyclic pipeline heat exchanger frosting
Caused by accidentally defrosting phenomenon, start defrosting when being also easy to occur frostless, and the operation of delay start defrosting is lost when having frost
Accidentally phenomenon, seriously affects the normal operation of heat pump system, has in turn resulted in a large amount of energy dissipation.Therefore, it develops a kind of extensive
Applied to the defrosting starting point determination method of polycyclic pipeline heat exchanger, not only there is important learning value, be also equipped with great reality
Border application value.
Summary of the invention
The present invention provides a kind of polycyclic pipeline heat exchanger defrosting starting point determination method of air source heat pump and systems, fully
The characteristics of considering polycyclic pipeline heat exchanger, measurement result is accurate, avoids the waste of the energy.Concrete scheme is as follows:
A kind of polycyclic pipeline heat exchanger defrosting starting point determination method of air source heat pump, comprising:
Frosting critical value A is calculated according to the overall heat exchange amount of outdoor heat exchanger；
The coil temperature T of outdoor heat exchanger described in each loop is obtained under heat supply modetubeAnd outdoor air is dry
Ball temperature Ta；
According to the coil temperature TtubeWith the dry-bulb temperature TaCalculate the EMF value of each outdoor heat exchanger；
The quantity for counting the outdoor heat exchanger of the EMF value less than or equal to the frosting critical value A, when quantity is super
Defrosting mode is opened when crossing the half of all outdoor heat exchangers (1).
Optionally, the dry-bulb temperature TaInlet air temperature T including the outdoor heat exchangerA, inWith outlet air temperature
Spend TA, out, the calculation formula of the EMF value are as follows:
EMF=(Ta,in-Ta,out)/(Ta,in-Ttube)
Wherein, TA, inFor the inlet air dry-bulb temperature of the outdoor heat exchanger, TA, outFor going out for the outdoor heat exchanger
Mouth air dry-bulb temperature, TtubeFor the coil temperature of the outdoor heat exchanger.
Optionally, the coil temperature TtubeFor being averaged for the outdoor heat exchanger refrigerant inlet temperature and outlet temperature
Value.
Optionally, the frosting critical value A is according to the overall heat exchange amount Q of the outdoor heat exchanger and outdoor airtot?
It arrives.
Optionally, when the heat that takes of the outdoor heat exchanger is the overall heat exchange amount QtotHalf when obtain the knot
White critical value A.
Optionally, the inlet air dry-bulb temperature TA, inFor being averaged for the multiple measurement points of outdoor heat exchanger windward side
Temperature；The outlet air dry-bulb temperature TA, outFor the mean temperature of the multiple measurement points of outdoor heat exchanger leeward side.
The present invention also provides a kind of polycyclic pipeline heat exchanger defrosting starting point decision-making systems of air source heat pump, comprising:
The dry-bulb temperature sensor being set on each outdoor heat exchanger fin；
The refrigerant temperature sensors being set on each outdoor heat exchanger refrigerant tubing；
According to the detection numerical value of the dry-bulb temperature sensor and the refrigerant temperature sensors, calculates the outdoor and change
The controller of hot device EMF value, the controller, which can analyze the EMF value and reach the outdoor of the frosting critical value A, to be changed
The quantity of hot device, to judge whether to reach defrosting starting point.
Optionally, the dry-bulb temperature sensor include be set on the outdoor heat exchanger air inlet side fin into
Outlet air sensor on mouth air borne sensor and air outlet slit side fin；The refrigerant temperature sensors include being set to
Inlet temperature sensor and the outdoor heat exchanger refrigerant outlet pipeline on the outdoor heat exchanger refrigerant inlet pipeline
On outlet temperature sensor.
Optionally, the inlet air sensor is at least arranged two, is respectively arranged at the outdoor heat exchanger windward side
Diagonal position；The outlet air sensor is at least arranged two, is respectively arranged at pair of the outdoor heat exchanger leeward side
Angle Position.
Optionally, the dry-bulb temperature sensor and the refrigerant temperature sensors are thermocouple.
The present invention provides a kind of polycyclic pipeline heat exchanger defrosting starting point determination methods of air source heat pump, including following step
It is rapid: to calculate frosting critical value A previously according to the overall heat exchange amount of outdoor heat exchanger；Under heat supply mode, room in each loop is obtained
The coil temperature T of external heat exchangertubeAnd 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；The quantity for counting outdoor heat exchanger of the EMF value less than or equal to frosting critical value A, works as number
Amount opens defrosting mode when being more than the half of all outdoor heat exchangers, makes indoor heat back transfer to outdoor, outdoor is changed
Frosting on hot device is removed.
The critical value that defrosting starting is determined in system initial launch, does not need to calculate repeatedly during normal operation
Heat exchange amount only need to measure this index of temperature, and measurement process is simple.It can be " frostless to avoid being encountered in Temperature-time determination method
And defrost " and the problem of " more frost without removing ", the characteristics of substantially envisaging polycyclic pipeline heat exchanger, measurement result is accurate, avoids
The waste of the energy.
In addition, the present invention also provides a kind of polycyclic pipeline heat exchanger defrosting starting point decision-making systems of air source heat pump, comprising: dry
The structures such as ball temperature sensor, refrigerant temperature sensors and reversal valve, dry-bulb temperature sensor are set to each outdoor heat exchange
On device fin；Refrigerant temperature sensors are set on each outdoor heat exchanger refrigerant tubing；Reversal valve is according to dry-bulb temperature
Sensor and the detected value of refrigerant temperature sensors change refrigerant flow direction.The system may be implemented same as described above
Technical effect.
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 flow chart of specific embodiment of present invention defrosting starting point determination method；
Fig. 2 is the structure and operational mode schematic diagram of air source heat pump system；
Fig. 3 A is the windward side structural schematic diagram 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 leeward structural schematic diagram of Three links theory outdoor heat exchanger；
Fig. 4 is that air source heat pump system heating mode and defrosting mode run switching flow figure.
Wherein:
Outdoor heat exchanger 1, dry-bulb temperature sensor 2, inlet air temperature sensor 21, outlet air temperature sensor
22, 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, dry valve 10
Specific embodiment
Core of the invention is to provide a kind of polycyclic pipeline heat exchanger defrosting starting point determination method of air source heat pump and is
The characteristics of uniting, substantially envisaging polycyclic pipeline heat exchanger, measurement result is accurate, avoids the waste of the energy.
In order to make those skilled in the art more fully understand technical solution of the present invention, below in conjunction with attached drawing and specifically
Embodiment, to the polycyclic pipeline heat exchanger of the air source heat pump of the application defrost starting point determination method and system carry out it is detailed
Introduce explanation.
As shown in Figure 1, a kind of flow chart of specific embodiment for present invention defrosting starting point determination method.The present invention
The polycyclic pipeline heat exchanger defrosting starting point determination method of the air source heat pump of offer, comprising the following steps: S1, changed previously according to outdoor
The overall heat exchange amount of hot device 1 calculates frosting critical value A, and frosting critical value A actual environment according to locating for outdoor heat exchanger 1 is true
It is fixed, if low EMF value thinks to start frosting when being less than or equal to A.S2, under heat supply mode, obtain outdoor heat exchanger 1 in each loop
Coil temperature Ttube, while also needing to obtain the dry-bulb temperature T of outdoor aira, TtubeAnd TaIt is polycyclic pipeline heat exchanger for hot-die
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, it using the two numerical value, is counted in corresponding calculation formula of submitting the article
It calculates, to obtain actual EMF value.The quantity of the outdoor heat exchanger 1 of S4, statistics EMF value less than or equal to frosting critical value A,
And it carries out step S5, judge whether the quantity of outdoor heat exchanger 1 of the EMF value less than or equal to frosting critical value A is more than to be had family
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 regular intervals respectively to each room
External heat exchanger 1 is once calculated, and thinks normal if EMF value is greater than frosting critical value A, frosting does not occur；If EMF value is small
Then think to start frosting in or equal to frosting critical value A, each outdoor heat exchanger 1 not necessarily all starts frosting at this time, is spaced one section
Duplicate measurements after time, until half or more than 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
Become evaporator and take heat from interior, outdoor heat exchanger 1 is changed into condenser to outdoor heat release from the evaporator under Heating State.It passes
When system time-temperature criterion mutually at regular intervals the temperature difference of measuring chamber external heat exchanger and outside air temperature to determine whether
The case where needing to enter defrosting mode, judge that point tolerance is larger, and being easy to appear " frostless and defrost " and " mostly white without removing ".
Method of the invention determines the critical value of defrosting starting in system initial launch, during normal operation not
It needs to calculate heat exchange amount repeatedly, only need to measure this index of temperature, measurement process is simple.It can be to avoid Temperature-time judgement side
The problem of encountering in method, the characteristics of substantially envisaging polycyclic pipeline heat exchanger, measurement result is accurate, avoids the waste of the energy.
On this basis, the dry-bulb temperature T used in the present inventionaInlet air temperature T including outdoor heat exchanger 1A, inWith
Outlet air temperature TA, outTwo parameters, according to the two Parameters Calculations EMF value, calculation 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, outFor the outlet air of outdoor heat exchanger 1
Dry-bulb temperature, TtubeFor the coil temperature of outdoor heat exchanger 1.After obtaining real-time EMF value according to above-mentioned formula, carried out with A
Compare, to judge whether to start frosting.
Further, coil temperature TtubeFor the average value of 1 refrigerant inlet temperature and outlet temperature of outdoor heat exchanger.?
A refrigerant temperature sensors 3 are respectively set on 1 inlet pipeline of outdoor heat exchanger and outlet conduit of each loop, with average value
As coil temperature TtubeKeep judging result more accurate.
Further, frosting critical value A is according to the overall heat exchange amount Q of outdoor heat exchanger 1 and outdoor airtotIt obtains.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 following formula:
Qtot=(Qa+Qr)/2 (2)
Wherein, QaFor the full heat of air, including sensible heat part and latent heat part；QrFor the inlet and outlet enthalpy difference of refrigerant.Qa
Calculation formula are as follows:
QrCalculation formula are as follows:
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, outRespectively room
The absolute humidity of external heat exchanger inlet and outlet air.
Simultaneous formula (1-4) obtains the overall heat exchange amount Q of outdoor polycyclic pipeline heat exchangertotAnd EMF value.When outdoor is more
Loop heat exchanger takes heat rapidly to lower, and when by half for maximum value, has:
According to the temperature parameter of initial experiment loop and environment temperature and humidity condition, can be calculated according to formula (1-5)
The EMF=A installed to the loop, this is the default decision content of the defrosting mode starting point of the loop.
In addition, program setting control system carries out the real time monitoring temperature data of each loop of outdoor polycyclic pipeline heat exchanger
Calculate real-time EMF value.If the polycyclic pipeline heat exchanger loop number is n, when there is (n+1)/2 (rounding) a loop to meet EMF≤A
When this condition, air source heat pump system enters defrosting mode.
Further, inlet air dry-bulb temperature TA, inFor the mean temperature of the multiple measurement points of 1 windward side of outdoor heat exchanger；
Outlet air dry-bulb temperature TA, outFor the mean temperature of the multiple measurement points of 1 leeward side of outdoor heat exchanger.Outdoor heat exchanger 1 windward
Multiple measurement points are arranged in side and leeward side, and the result of each measurement point is averaged.
In addition, the present invention also provides a kind of polycyclic pipeline heat exchanger defrosting starting point decision-making system of air source heat pump, such as Fig. 2
It is shown, it is the structure and operational mode schematic diagram of air source heat pump system.The system includes dry-bulb temperature sensor 2, refrigerant
The structures such as temperature sensor 3, controller and reversal valve 4, the present invention in reversal valve 4 preferably use four-way reversing valve.Wherein, it does
Ball temperature sensor 2 is set on each 1 fin of outdoor heat exchanger；Refrigerant temperature sensors 3 are set to each outdoor heat exchange
On 1 refrigerant tubing of device；Detection numerical value of the controller according to 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, with judgement
Whether arrival defrost starting point.When reaching defrosting starting point, controller controls reversal valve 4 and changes refrigerant flow direction, makes
Refrigerant 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 set on the fin of 1 air inlet side of outdoor heat exchanger, and outlet air sensor 22 is set to 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, are entered
Mouth temperature sensor 31 is set on the pipeline of 1 refrigerant inlet of outdoor heat exchanger, and outlet temperature sensor 32 is set to outdoor
On the pipeline of 1 refrigerant outlet of heat exchanger.The value that inlet temperature sensor 31 and outlet temperature sensor 32 measure substitutes into formula
(1) EMF value is calculated.
More specifically, inlet air sensor 21 is at least arranged two, it is respectively arranged at pair of 1 windward side of outdoor heat exchanger
Angle Position；Outlet air sensor 22 is at least arranged two, is respectively arranged at the diagonal position of 1 leeward side of outdoor heat exchanger.Such as
Shown in Fig. 3 A to Fig. 3 C, windward side structure, side structure and the leeward structural representation of Three links theory outdoor heat exchanger are respectively indicated
Figure；The arrow of Fig. 3 A and Fig. 3 C indicate the flow direction of refrigerant, and the arrow of Fig. 3 B indicates 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 1 windward side of outdoor heat exchanger；Two outlet air sensors 22
It is respectively arranged at the lower left corner and the upper right corner of 1 leeward of outdoor heat exchanger.
Dry-bulb temperature sensor 2 of the present invention and refrigerant temperature sensors 3 are thermocouple, can be examined in real time
Thermometric angle value.
As shown in Fig. 2, further including indoor heat exchanger 5, compressor 6, liquid trap 7, electric expansion valve 8, check-valves 9, drying
The structures such as valve 10.As shown in figure 4, running switching flow figure for air source heat pump system heating mode and defrosting mode.Open heat
Pumping system is first run with heat supply mode, and the too low heat exchanger frosting of outdoor temperature carries out Data Detection through thermocouple, works as controller
It when needing to defrost using the judgement of EMF method, is commutated by four-way reversing 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, is commutated by four-way reversing valve, air source heat pump system is run with heat supply mode.
Temperature point, the present invention is arranged by the refrigerant and air ports in each loop of polycyclic pipeline heat exchanger in the present invention
Attached drawing is illustrated with the heat exchanger of three loops.Pass through the heat exchange amount of outdoor heat exchanger 1 and outdoor air real time monitoring and meter
Point counting analysis, determines whether each loop reaches the critical state of defrosting starting, final to realize sentencing for air source heat pump defrosting starting point
It is fixed.
In system initial launch, the heat exchange amount by analyzing outdoor heat exchanger 1 and air is needed, so that it is determined that frosting is faced
Dividing value A does not need to calculate heat exchange amount repeatedly in its normal course of operation, need to only measure this index of temperature, measuring device peace
Dress is simple, and system initial cost and operating cost are low.
It defrosts determination method the present invention is based on EMF, in conjunction with actual conditions, the characteristics of having fully considered polycyclic pipeline heat exchanger,
It is possible to prevente effectively from missing defrosting problem caused by polycyclic pipeline heat exchanger frosting is uneven.This method and system do not need setting time
Parameter, thus can determine to avoid the time and Temperature-time determination method in " frostless and defrost " that encounters and " it is mostly white without
Except " mistake defrost problem, avoid the waste of system capacity.
Polycyclic pipeline heat exchanger frosting degree may be implemented by the real-time acquisition and its logic calculation analysis of temperature in the present invention
Real time monitoring effectively reduces the probability of accidentally defrosting.Facilitate system simultaneously and realizes that heat supply mode and the automatic of defrosting mode are cut
It changes, high degree of automation, provides and refer to and reference for intelligent product development.
The polycyclic pipeline heat exchanger defrosting starting point decision-making system of air source heat pump provided by the invention is based on temperature and measures, and shows
Some defrosting starting point determination methods are compared, and measurement device type is single, installation is simple, 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, and mistake when avoiding frostless defrosts and has
Delay defrosting phenomenon when white；Whole system design is rationally efficient, without additional drag is generated, takes up space small, after installation
It will not influence the normal operation of air source heat pump system；It is designed for polycyclic pipeline heat exchanger, it is possible to prevente effectively from uneven frosting
When mistake defrost phenomenon, have very high engineering application value.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, this hair
It is bright to be not intended to be limited to the embodiments shown herein, and be to fit to and the principles and novel features disclosed herein phase
Consistent widest scope.
Claims (7)
- The starting point determination method 1. a kind of polycyclic pipeline heat exchanger of air source heat pump defrosts characterized by comprisingFrosting critical value A is calculated according to the overall heat exchange amount of outdoor heat exchanger (1)；The coil temperature Ttube of outdoor heat exchanger described in each loop (1) and doing for outdoor air are obtained under heat supply mode Ball temperature Ta；The EMF value of each outdoor heat exchanger (1) is calculated according to the coil temperature Ttube and dry-bulb temperature Ta；The quantity for counting the outdoor heat exchanger (1) of the EMF value less than or equal to the frosting critical value A, when quantity is super Defrosting mode is opened when crossing the half of all outdoor heat exchangers (1)；The dry-bulb temperature Ta includes the inlet air temperature Ta, in and outlet air temperature Ta of the outdoor heat exchanger (1), Out, the calculation formula of the EMF value are as follows:EMF=(Ta,in-Ta,out)/(Ta,in-Ttube)Wherein, Ta, in are the inlet air dry-bulb temperature of the outdoor heat exchanger (1), and Ta, out are the outdoor heat exchanger (1) Outlet air dry-bulb temperature, Ttube be the outdoor heat exchanger (1) coil temperature；The frosting critical value A is obtained according to the outdoor heat exchanger (1) and the overall heat exchange amount Qtot of outdoor air；When described Outdoor heat exchanger (1) takes heat to obtain the frosting critical value A when half of the overall heat exchange amount Qtot.
- The starting point determination method 2. the polycyclic pipeline heat exchanger of air source heat pump according to claim 1 defrosts, which is characterized in that The coil temperature Ttube is the average value of the outdoor heat exchanger (1) refrigerant inlet temperature and outlet temperature.
- The starting point determination method 3. the polycyclic pipeline heat exchanger of air source heat pump according to claim 2 defrosts, which is characterized in that The inlet air dry-bulb temperature Ta, in are the mean temperature of the multiple measurement points of the outdoor heat exchanger (1) windward side；It is described go out Mouth air dry-bulb temperature Ta, out are the mean temperature of the multiple measurement points of the outdoor heat exchanger (1) leeward side.
- The starting point decision-making system 4. a kind of polycyclic pipeline heat exchanger of air source heat pump defrosts characterized by comprisingThe dry-bulb temperature sensor (2) being set on each outdoor heat exchanger (1) fin；The refrigerant temperature sensors (3) being set on each outdoor heat exchanger (1) refrigerant tubing；According to the detection numerical value of the dry-bulb temperature sensor (2) and the refrigerant temperature sensors (3), the outdoor is calculated The controller of heat exchanger (1) EMF value, the outdoor that the controller can analyze the EMF value arrival frosting critical value A are changed The quantity of hot device (1), to judge whether to reach defrosting starting point；The calculation formula of the EMF value are as follows:EMF=(Ta,in-Ta,out)/(Ta,in-Ttube)Wherein, Ta, in are the inlet air dry-bulb temperature of the outdoor heat exchanger (1), and Ta, out are the outdoor heat exchanger (1) Outlet air dry-bulb temperature, Ttube be the outdoor heat exchanger (1) coil temperature；The frosting critical value A is obtained according to the outdoor heat exchanger (1) and the overall heat exchange amount Qtot of outdoor air；When described Outdoor heat exchanger (1) takes heat to obtain the frosting critical value A when half of the overall heat exchange amount Qtot.
- The starting point decision-making system 5. the polycyclic pipeline heat exchanger of air source heat pump according to claim 4 defrosts, feature exist In the dry-bulb temperature sensor (2) includes the inlet air being set on the outdoor heat exchanger (1) air inlet side fin Outlet air sensor (22) on sensor (21) and air outlet slit side fin；The refrigerant temperature sensors (3) include The inlet temperature sensor (31) and the outdoor heat exchanger being set on the outdoor heat exchanger (1) refrigerant inlet pipeline (1) outlet temperature sensor (32) on refrigerant outlet pipeline.
- The starting point decision-making system 6. the polycyclic pipeline heat exchanger of air source heat pump according to claim 5 defrosts, which is characterized in that The inlet air sensor (21) is at least arranged two, is respectively arranged at the diagonal bits of the outdoor heat exchanger (1) windward side It sets；The outlet air sensor (22) is at least arranged two, is respectively arranged at the diagonal of the outdoor heat exchanger (1) leeward side Position.
- The starting point decision-making system 7. the polycyclic pipeline heat exchanger of air source heat pump according to claim 6 defrosts, which is characterized in that The dry-bulb temperature sensor (2) and the refrigerant temperature sensors (3) are thermocouple.
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| CN107202399B (en) * | 2017-05-17 | 2020-08-04 | 青岛海尔空调器有限总公司 | Defrosting control method for air conditioner |
| CN107178939B (en) * | 2017-05-17 | 2020-08-04 | 青岛海尔空调器有限总公司 | Defrosting control method for air conditioner |
| CN107179205A (en) * | 2017-06-07 | 2017-09-19 | 广东工业大学 | A kind of frosting cloud test method and system |
| CN109579384B (en) * | 2018-11-23 | 2020-07-10 | 广东日出东方空气能有限公司 | Defrosting method of air source heat pump hot water unit |
| WO2020150889A1 (en) * | 2019-01-22 | 2020-07-30 | 北京卡林新能源技术有限公司 | Control system for sequential defrosting of moist-air heat exchanger |
| CN111947350B (en) * | 2019-05-14 | 2023-05-12 | 广东万和电气有限公司 | Defrosting control method, defrosting control system and air source heat pump device |
| CN110793241A (en) * | 2019-10-10 | 2020-02-14 | 青岛新欧亚能源有限公司 | Large-scale air source heat pump frostless operation system and control method |
| CN110793239B (en) * | 2019-10-10 | 2021-07-27 | 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 |
| CN111609665B (en) * | 2020-05-15 | 2021-12-07 | 珠海格力电器股份有限公司 | Defrosting control method and device |
| 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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