Summary of the invention
In order to solve the problems, such as or mitigate at least one in the above problem in the presence of the relevant technologies, the present invention provides onePlant the control method and a kind of associated air-conditioning system for controlling the operation of air-conditioning system, it is intended to improve the anti-of air-conditioning systemFreeze performance and/or refrigerating capacity regulation performance.
According to an aspect of the present invention, it provides a kind of for controlling the control method of the operation of air-conditioning system.The skyAdjusting system includes the First Heat Exchanger being arranged in the circulation loop of the air-conditioning system and the second heat exchanger, the circulation loopIn operating fluid crosses described in First Heat Exchanger and absorb heat and flow through second heat exchanger and discharge heat.It is describedControl method is the following steps are included: First Heat Exchanger detecting step, that is, detects the operating parameter of the First Heat Exchanger, whereinThe First Heat Exchanger detecting step includes: the pressure and/or temperature for detecting the First Heat Exchanger (10)；
The First Heat Exchanger (10) is evaporator, and
The First Heat Exchanger detecting step includes: evaporating pressure and/or the evaporation for detecting the First Heat Exchanger (10)Temperature；And the second heat exchanger regulating step, that is, second heat exchanger is adjusted according to the operating parameter of the First Heat ExchangerOperation, thus the operating parameter of the First Heat Exchanger is changed to predefined parameter range；
In the case where detecting the evaporating pressure of the First Heat Exchanger (10), the second heat exchanger regulating step packetIt includes: when the detection evaporating pressure of the First Heat Exchanger (10) is less than or equal to first threshold (M), reducing second heat exchanger(30) heat exchange area, and when the detection evaporating pressure of the First Heat Exchanger (10) is more than or equal to than the first threshold (M)When big second threshold (P), increase the heat exchange area of second heat exchanger (30).
Preferably, in above-mentioned control method: second heat exchanger includes more the second heat exchangers being connected in parallel, withAnd the second heat exchanger regulating step includes: when the detection evaporating pressure of the First Heat Exchanger is less than or equal to described firstWhen threshold value, the unlatching number of units of second heat exchanger is reduced to reduce the heat exchange area of second heat exchanger, when described theWhen the detection evaporating pressure of one heat exchanger is more than or equal to the second threshold, increase the unlatching number of units of second heat exchanger so as toIncrease the heat exchange area of second heat exchanger.
Preferably, in above-mentioned control method: second heat exchanger includes heat exchange blower fan, and, detecting described theIn the case where the evaporating pressure of one heat exchanger, the second heat exchanger regulating step includes: the detection when the First Heat ExchangerWhen evaporating pressure is less than or equal to first threshold, reduce the revolving speed of the heat exchange blower fan, and when the detection of the First Heat Exchanger is steamedWhen sending out pressure more than or equal to the second threshold bigger than the first threshold, increase the revolving speed of the heat exchange blower fan.
Preferably, in above-mentioned control method, the first threshold corresponds to such value, when the First Heat ExchangerThere is bursting by freezing in the First Heat Exchanger when evaporating pressure is less than the value, and the second threshold corresponds to such value, when described theThere is cooling supply deficiency in the air-conditioning system when evaporating pressure of one heat exchanger is greater than the value.
Preferably, in above-mentioned control method: the air-conditioning system further includes that being located in the circulation loop is arranged inThe upstream of the First Heat Exchanger and be located at second heat exchanger downstream pump, and, the control method further include pumpRegulating step --- when the detection evaporating pressure of the First Heat Exchanger is less than or equal to the first threshold, reduce the pumpPumpability, and when the detection evaporating pressure of the First Heat Exchanger is more than or equal to the second threshold, increase the pumpPumpability.
Preferably, in above-mentioned control method: the pump is variable frequency pump, and, the pump regulating step includes: when describedWhen the detection evaporating pressure of First Heat Exchanger is less than or equal to first threshold, reduce the working frequency of the pump, and works as described firstWhen the detection evaporating pressure of heat exchanger is more than or equal to the second threshold bigger than the first threshold, increase the work frequency of the pumpRate.
Preferably, in above-mentioned control method: the air-conditioning system further includes that being located in the circulation loop is arranged inThe valve of the upstream of the First Heat Exchanger, and, the control method further includes valve regulation step --- when the First Heat ExchangerDetection evaporating pressure when being less than or equal to first threshold, reduce the aperture of the valve, and when the detection of the First Heat Exchanger is steamedWhen sending out pressure more than or equal to the second threshold, increase the aperture of the valve.
Preferably, in above-mentioned control method, the second heat exchanger regulating step includes: to change second heat exchangeAfter the heat exchange area of device, when the detection evaporating pressure change of the First Heat Exchanger to more than the first threshold and it is less than instituteWhen stating the third value of second threshold, restore the heat exchange area of second heat exchanger to former heat exchange area.
According to another aspect of the present invention, a kind of air-conditioning system is provided.The air-conditioning system includes control device, the controlControl method controls the operation of the air-conditioning system to device processed as described above.
Preferably, in above-mentioned air-conditioning system, the air-conditioning system is air cooling cold water air conditioning group, and the circulation loop isNatural cooling circulation loop.
According to the present invention, by detecting the operating parameter of First Heat Exchanger then according to the operating parameter tune of First Heat ExchangerIt saves the operation of the second heat exchanger and/or adjusts the pumpability etc. of pump, be able to solve (low temperature) natural cooling circulatorCase tube heat exchanger hypotony temperature is too low to the problem of package bursting by freezing occur when group operation, thereby guarantees that unit is reliable for operationProperty.On the other hand, by changing the revolving speed of the heat exchange area of the second heat exchanger, the heat exchange blower fan for changing the second heat exchanger, changingThe aperture (the especially co-operatings of these modes) of the revolving speed of pump and/change valve, can be reliably achieved air-conditioning system with certainlyThe reliable adjustment (such as being adjusted between 10%-100%) of refrigerating capacity when right cooling cycle operation.Also on the one hand, due to adoptingWith variable frequency pump, compared with using the scheme of fixed frequency pump, can when natural cooling Cycle Unit is run solution determine frequency pump capacity withoutMethod adjusts and determines the problem of frequency pumps normally opened normal pass and influences the reliability of pump while influencing client's comfort.
Specific embodiment
With reference to the accompanying drawings, by illustrative embodiments, the present invention will be described in detail.To it is of the invention it is following in detailThin description is definitely not to the present invention and its application or the limitation of purposes merely for the sake of illustration purpose.
Uniquely scheme to be Fig. 1 (Fig. 1 is the structural block diagram for showing air-conditioning system according to the present invention) referring to the application, according toAir-conditioning system AC of the invention includes the First Heat Exchanger 10 being arranged in the circulation loop CL of air-conditioning system AC and the second heat exchangeDevice 30.
The working fluid circulated in circulation loop CL can flow through First Heat Exchanger 10 and can change firstHeat (that is, cooling capacity is discharged to environment) is absorbed in hot device 10.The working fluid circulated in circulation loop CL can flowHeat (that is, receiving cooling capacity from environment) can be discharged through the second heat exchanger 30 and in the second heat exchanger 30.
Air-conditioning system AC can be air cooling cold water air conditioning group.Specifically, the second heat exchanger 30 can carry out heat with airExchange and heat is discharged into air, and First Heat Exchanger 10 can with water carry out heat exchange and absorb the heat in water toThere is provided cold water thus can be to indoor offer cold air by cold water.Circulation loop CL can be natural cooling circulation loop,In this case, the device such as can be omitted compressor in circulation loop CL.
In some instances, First Heat Exchanger 10 can be evaporator, and the second heat exchanger 30 can be condenser.EspeciallyGround, First Heat Exchanger 10 can be case tube heat exchanger such as shell-tube evaporator, and the second heat exchanger 30 can be finned heat exchangerSuch as fin condenser.It will be appreciated, however, that according to the present invention, First Heat Exchanger 10 and the second heat exchanger 30 are also possible to itThe heat exchanger of its type, for example, working fluid can not undergone veritably in First Heat Exchanger 10 and the second heat exchanger 30Evaporation process and condensation process.In this case it is possible, for example, to use water as working fluid, and sky according to the present inventionThe purpose of adjusting system essentially consists in the reliable adjustment of refrigerating capacity.
In the example shown in the series of figures, the second heat exchanger 30 may include more the second heat exchangers being connected in parallel.Every secondHeat exchanger is provided with corresponding control valve 34.When control valve 34 is opened, corresponding second heat exchanger 30 of operating fluid crosses, fromAnd the overall heat exchange area of the second heat exchanger 30 can be increased.When control valve 34 is closed, working fluid is prevented from flow through accordinglyThe second heat exchanger 30, so as to reduce the overall heat exchange area of the second heat exchanger 30.
In the example shown in the series of figures, the second heat exchanger 30 may include heat exchange blower fan 32.It include parallel connection in the second heat exchanger 30In the case where more the second heat exchangers of connection, corresponding heat exchange blower fan 32 can be set for every second heat exchanger.Preferably,Heat exchange blower fan 32 can be frequency conversion fan (it is of course also possible to for that can change other hot ventilating fans of revolving speed), and thus, it is possible to logicalThe revolving speed crossed the working frequency for changing heat exchange blower fan 32 and change heat exchange blower fan 32.
Air-conditioning system AC can also include be arranged in circulation loop CL positioned at First Heat Exchanger 10 upstream and be located atThe pump (working fluid pump) 50 in the downstream of the second heat exchanger 30.Pump 50 can be used for supplying to First Heat Exchanger 10 to be changed from secondThe working fluid (refrigerant) of hot device and the working fluid that output to First Heat Exchanger 10 can be controlled and controlling its revolving speedFlow.In a preferable example, pump 50 is variable frequency pump.
In some instances, air-conditioning system AC can also include being arranged in circulation loop CL to be located at First Heat Exchanger 10Upstream valve (such as solenoid valve) 60, for example, valve 60 can be located at pump 50 and First Heat Exchanger 10 between, particularly, valve 60The amount that the working fluid flowed into First Heat Exchanger 10 is controlled at the inlet tube of First Heat Exchanger 10 can be located at.
In the example shown in the series of figures, air-conditioning system AC can also include being arranged in circulation loop CL to be located at First Heat Exchanger10 downstream and be located at the second heat exchanger 30 upstream valve (such as solenoid valve) 70.The workflow flowed out from First Heat Exchanger 10Body enters in the second heat exchanger 30 via valve 70.
According to the present invention, it provides a kind of for controlling the control method of the operation of air-conditioning system AC.
Control method may include First Heat Exchanger detecting step and the second heat exchanger regulating step.
In First Heat Exchanger detecting step, the operating parameter of First Heat Exchanger 10 is detected.For example, passing through First Heat ExchangerIn pressure sensor detection First Heat Exchanger 10 in working fluid pressure (such as evaporating pressure), then will test pressure againSignal (data) feedback arrives mainboard (control device).
In the second heat exchanger regulating step, the behaviour of the second heat exchanger 30 is adjusted according to the operating parameter of First Heat Exchanger 10Make, thus changes the operating parameter of First Heat Exchanger 10 to predefined parameter range.
First Heat Exchanger detecting step may include: the pressure and/or temperature for detecting First Heat Exchanger 10.That is,The operating parameter of First Heat Exchanger 10 may include the pressure and/or temperature of First Heat Exchanger 10.Here, First Heat Exchanger 10Pressure and temperature can for example refer to the pressure and temperature of working fluid in First Heat Exchanger 10.
Particularly, in the case where First Heat Exchanger 10 is evaporator, First Heat Exchanger detecting step may include: detectionEvaporating pressure and/or the evaporating temperature (evaporating pressure of working fluid and/or the evaporation in First Heat Exchanger 10 of First Heat Exchanger 10Temperature).
In the case where detecting the evaporating pressure of First Heat Exchanger 10, the second heat exchanger regulating step may include: when theWhen the detection evaporating pressure of one heat exchanger 10 is less than or equal to first threshold M (Kpa), reduce the heat exchange area of the second heat exchanger 30,And when the detection evaporating pressure of First Heat Exchanger 10 is more than or equal to second threshold P (Kpa) bigger than first threshold M, increase theThe heat exchange area of two heat exchangers 30.
In some instances, first threshold M can correspond to such value, when the evaporating pressure of First Heat Exchanger 10 is less thanFirst Heat Exchanger 10 when the value is it is possible that bursting by freezing (for example, when First Heat Exchanger 10 is case tube heat exchanger and package exchanges heatHave that when will be by water that working fluid cools down, the evaporating pressure of First Heat Exchanger 10 be too small so that water is freezed and is caused in devicePackage bursting by freezing), second threshold P can correspond to such value, the air-conditioning when the evaporating pressure of First Heat Exchanger 10 is greater than the valueSystem AC is it is possible that cooling supply is insufficient.In this case, the predetermined ginseng of the operation of First Heat Exchanger 10 as described aboveNumber range can refer to: the evaporating pressure range of First Heat Exchanger 10 being between M and P.
In the case where the second heat exchanger 30 includes more the second heat exchangers being connected in parallel, the second heat exchanger regulating stepIt may include: to reduce opening for the second heat exchanger 30 when the detection evaporating pressure of First Heat Exchanger 10 is less than or equal to first threshold MNumber of units (such as reducing one) is opened to reduce the heat exchange area of the second heat exchanger 30, when the detection vapor pres- sure of First Heat Exchanger 10When power is more than or equal to second threshold P, the unlatching number of units (such as increasing by one) for increasing by the second heat exchanger 30 is changed to increase secondThe heat exchange area of hot device 30.
In the case where the second heat exchanger 30 includes heat exchange blower fan 32, the second heat exchanger regulating step may include: when theWhen the detection evaporating pressure of one heat exchanger 10 is less than or equal to first threshold M, reduce the revolving speed of heat exchange blower fan 32 (preferably by subtractingThe working frequency of small heat exchange blower fan 32), and when the detection evaporating pressure of First Heat Exchanger 10 is more than or equal to bigger than first threshold MWhen second threshold P, increase the revolving speed (working frequency preferably by increasing heat exchange blower fan 32) of heat exchange blower fan 32.
Here, it should be noted that the second heat exchanger regulating step can by dual-purpose change heat exchange area in a manner of and changeThe mode of heat exchange blower fan revolving speed.
Control method can also include pump regulating step: when the detection evaporating pressure of First Heat Exchanger 10 is less than or equal to firstWhen threshold value M, reduce the pumpability of pump 50, and when the detection evaporating pressure of First Heat Exchanger 10 is more than or equal to second threshold P,Increase the pumpability of pump 50.Here, although it is preferred that the second heat exchanger regulating step and pump regulating step is used in combination, soAnd it is contemplated that pump regulating step can substitute the second heat exchanger regulating step individually to realize the fortune of First Heat Exchanger 10Row parameter change is to predefined parameter range.
Particularly, in the case where pump 50 is variable frequency pump, pump regulating step may include: the detection when First Heat Exchanger 10When evaporating pressure is less than or equal to first threshold M, reduce the working frequency of pump 50, and works as the detection evaporating pressure of First Heat Exchanger 10When more than or equal to the second threshold P bigger than first threshold M, increase the working frequency of pump 50.
In some instances, in the case where air-conditioning system AC further includes valve 60 for controlling flow, control method is alsoIt may include valve regulation step: when the detection evaporating pressure of First Heat Exchanger 10 is less than or equal to first threshold M, reducing valve 60Aperture, and when the detection evaporating pressure of First Heat Exchanger 10 is more than or equal to second threshold P, increase the aperture of valve 60.
In some instances, the second heat exchanger regulating step can also include: to exchange heat in change (being decreased or increased) secondAfter the heat exchange area of device 30, when the detection evaporating pressure of First Heat Exchanger 10 changes (increasing or reducing) to more than first thresholdM and be less than second threshold P third value N (Kpa) when, restore the heat exchange area of the second heat exchanger 30 to former heat exchange area (i.e.Heat exchange area before change).Here, it should be noted that the reset mode be equally applicable to other regulating steps (such asPump regulating step and valve regulation step) and the change heat exchange blower fan revolving speed in the second heat exchanger regulating step mode.
In air-conditioning system AC according to the present invention, (the especially heat exchange of the second heat exchanger is adjusted by the second heat exchangerArea is adjusted) and the co-operating adjusted is pumped (wherein it is possible to which the variable frequency adjustment preferentially pumped then auxiliarily change by progress secondThe heat exchange area of hot device is adjusted, and the heat exchange area that can also preferentially carry out the second heat exchanger adjusts the change then auxiliarily pumpedFrequency modulation section), it can reliably and on a large scale adjust the refrigerating capacity of air-conditioning system AC.
Here, it is also necessary to explanation, although above mainly with the evaporating pressure of First Heat Exchanger and corresponding threshold valueControl method according to the present invention is described for comparing, however it is contemplated that in other examples, it is according to the present inventionControl method can also be executed based on the comparison of other parameters (such as temperature of First Heat Exchanger) its corresponding threshold value.
According to the present invention, a kind of air-conditioning system AC is also provided.Air-conditioning system AC may include that control device (may include masterPlate) CD.Control device CD control method can control the operation of air-conditioning system AC as described above.
According to the present invention, by detecting the operating parameter of First Heat Exchanger then according to the operating parameter tune of First Heat ExchangerIt saves the operation of the second heat exchanger and/or adjusts the pumpability etc. of pump, be able to solve (low temperature) natural cooling circulatorCase tube heat exchanger hypotony temperature is too low to the problem of package bursting by freezing occur when group operation, thereby guarantees that unit is reliable for operationProperty.On the other hand, by changing the revolving speed of the heat exchange area of the second heat exchanger, the heat exchange blower fan for changing the second heat exchanger, changingThe aperture (the especially co-operatings of these modes) of the revolving speed of pump and/change valve, can be reliably achieved air-conditioning system with certainlyThe reliable adjustment (such as being adjusted between 10%-100%) of refrigerating capacity when right cooling cycle operation.Also on the one hand, due to adoptingWith variable frequency pump, compared with using the scheme of fixed frequency pump, can when natural cooling Cycle Unit is run solution determine frequency pump capacity withoutMethod adjusts and determines the problem of frequency pumps normally opened normal pass and influences the reliability of pump while influencing client's comfort.
It should be noted that in the present specification, whenever referring to " some examples ", " other examples ", " example of diagram "Mean whens " preferred example " etc. for the example description specific feature, structure or feature include it is of the invention extremelyIn a few example.The appearance of these words different places in the present specification is not necessarily all referring to same example.In addition, working as needleWhen describing specific feature, structure or feature to any example, it will be understood that those skilled in the art also can be all describedThis feature, structure or feature are realized in other examples in example.
In addition, in present specification, term " includes " or its any other variant are intended to the packet of nonexcludabilityContain, so that the process, method, article or equipment for including a series of elements not only includes those elements, but also can be withIncluding the other elements being not explicitly listed, or can also include for this process, method, article or equipment institute inherentlyElement.
Finally it should be noted that, it is clear that, above embodiment/example is only intended to clearly illustrate made by the present invention and liftsExample, and not limitation of the present invention.To those skilled in the art, it can also be made on the basis of the above descriptionIts various forms of variation or variation.There is no need and unable to be exhaustive to all embodiment/examples.And thus drawnThe obvious changes or variations that Shen goes out are still in the protection scope of this invention.