CN101025317A - Condensation pressure control method - Google Patents
Condensation pressure control method Download PDFInfo
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- CN101025317A CN101025317A CN 200610008113 CN200610008113A CN101025317A CN 101025317 A CN101025317 A CN 101025317A CN 200610008113 CN200610008113 CN 200610008113 CN 200610008113 A CN200610008113 A CN 200610008113A CN 101025317 A CN101025317 A CN 101025317A
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Abstract
The invention discloses a kind of control method of refrigerating pressure, it includes processes as follow: To make sure the corresponding refrigerating pressure when the first fan is turned on; According to the corresponding refrigerating pressure, to get the corresponding ambient temperature of the pressure control points on the combination refrigerating pressure-ambient temperature curve of fan; According to the corresponding ambient temperature of the pressure control points, to get the corresponding refrigerating pressure of the pressure control points on the refrigerating pressure-ambient temperature curve of the first fan; According to the sum of the corresponding refrigerating pressure and control parameters of the pressure control points, to get the corresponding refrigerating pressure when the second fan is turned on. This invention can set the start-stop pressure of multi-groups fans appropriately yet, avoiding frequent start-stop of fans and fans overloading.
Description
Technical field
The present invention relates to a kind of control method of air-cooled air-conditioning unit, specifically, relate to a kind of condensation pressure control method
Background technology
Adopt the air-cooled type of cooling to realize the air-conditioning unit of kind of refrigeration cycle, condensing pressure changes with variation of ambient temperature.When outdoor environment temperature is low, when particularly environment temperature is lower than the standard design operating mode of air-conditioning unit, cause the condensing pressure of refrigeration system lower, the air-conditioning unit time can produce a lot of problems in operation, for example can cause that the thermal expansion valve events is bad, the compressor oil return is bad etc.In order to improve the condensing pressure of system, set up certain high-low pressure pressure differential, way commonly used is to control the variation of condensing pressure by the start and stop of control condensation fan.Existing control method all is to control under designer's working experience, for example sets the start and stop force value of blower fan artificially, opens when condensing pressure is higher than the setting value blower fan, prevents that condensing pressure is too high; When condensing pressure is lower than the start and stop force value of setting, blower fan stops, and keeps certain condensing pressure.But, this setting value determine do not have concrete foundation or computational methods, usually because the improper blower fan frequent start-stop that causes of design, cause the fault of blower fan overload.
Summary of the invention
Technical problem solved by the invention provides a kind of condensation pressure control method, is used to set up certain high-low pressure pressure differential.
Technical scheme of the present invention is as follows:
A kind of condensation pressure control method comprises the following steps:
A, fixed first blower fan are opened corresponding condensing pressure;
B, on the combination condensing pressure-environment temperature curve of blower fan, obtain the environment temperature of pressure control point correspondence according to the condensing pressure of the unlatching correspondence of first blower fan;
C, on the condensing pressure-environment temperature curve of first blower fan, obtain the condensing pressure of pressure control point correspondence according to the environment temperature of pressure control point correspondence;
D, according to the condensing pressure of pressure control point correspondence and control parameter and obtain second blower fan and open corresponding condensing pressure.
Preferably, the corresponding condensing pressure of described first blower fan unlatching is the minimum condensing pressure of air-conditioning unit operate as normal.
Preferably, the corresponding condensing pressure of described first blower fan unlatching is between 1.2MPa～1.3MPa.
Preferably, described control parameter is determined according to structure of condenser.
Preferably, described control parameter is between 0.2Mpa to 0.3Mpa.
Preferably, described condensing pressure-environment temperature curve and combination condensing pressure-environment temperature curve are determined according to structure of condenser.
Described condensation pressure control method also comprises the steps:
E, open corresponding condensing pressure according to second blower fan and on the combination condensing pressure-environment temperature curve of three groups of blower fans, obtain the 3rd blower fan and open corresponding environment temperature;
F, open corresponding environment temperature according to the 3rd blower fan and on the condensing pressure-environment temperature curve of two groups of blower fans, obtain the 3rd blower fan and open corresponding condensing pressure.
Preferably, described condensing pressure is relevant with the operating characteristic of heating power expansion valve or compressor.
The inventive method can improve the condensing pressure of refrigeration system, makes refrigeration system set up certain high-low pressure pressure differential.Simultaneously, the inventive method can also rationally be set the start and stop pressure of many group blower fans, avoids the frequent start-stop and the blower fan overload of blower fan.
Description of drawings
Fig. 1 is the condensing pressure-environment temperature functional arrangement of one of preferred embodiment of the present invention;
Fig. 2 is condensing pressure-environment temperature functional arrangement of two of the preferred embodiment of the present invention.
The specific embodiment
Refrigeration system can be divided high and low pressure two parts when operation.To choke valve, this section is called condensing pressure to high pressure section, also can be described as pressure at expulsion from the exhaust outlet of compressor.Low pressure stage is meant that choke valve is exported to the air entry of compressing surface, and this section is called evaporating pressure.The air entry pressure of compressor is called pressure of inspiration(Pi), and pressure of inspiration(Pi) approaches evaporating pressure, and both differences are exactly the flow resistance of pipeline.The pressure loss generally is limited in below the 0.015MPa.For simplicity, the evaporating pressure of refrigeration system and condensing pressure all detect at suction, the exhaust outlet of compressor.Promptly be commonly referred to suction, the pressure at expulsion of compressor.Detecting the suction of refrigeration system, the purpose of pressure at expulsion, is the evaporating temperature and the condensation temperature that will obtain refrigeration system, obtains the operation conditions of refrigeration system with this.In refrigeration system when operation,, its pressure at expulsion is corresponding with condensation temperature, and the flow of condensation temperature and its cooling medium and temperature, cold-producing medium injection rate, cooling load etc. are relevant.When checking refrigeration system, should adorn an exhaust gas pressure gage at the blast pipe place, detect pressure at expulsion, as the analysis of failure data.
The effect of heating power expansion valve is with cold-producing medium throttling step-down, so that gasification heat absorption in evaporimeter; Regulate liquid supply rate, meet the needs of the thermic load of freezing; Guarantee that cold-producing medium has certain degree of superheat, in order to avoid the utilization rate of " liquid hammer " and assurance evaporimeter.
The inventive method can be applied to have the condensing unit of many group blower fans.
Be described in detail below in conjunction with one of 1 pair of preferred embodiment of the present invention of accompanying drawing.
In this preferred embodiment, air-cooled air-conditioning unit is provided with two groups of blower fans, is respectively first blower fan and second blower fan, and the opening pressure difference of these two groups of blower fans can drop into one group or two groups of blower fan work respectively under different condensing pressures.
Among Fig. 1, ordinate P represents the condensing pressure under the different operating modes, and abscissa T represents environment temperature.The curve in top is represented put into operation operation curve under the situation of first group of blower fan, and a following curve is represented put into operation simultaneously operation curve under the situation of two groups of blower fans.
At first, determine the i.e. opening pressure P1 of first blower fan of first group of blower fan.Minimum condensing pressure when this opening pressure P1 chooses air-cooled air-conditioning unit operate as normal.Opening pressure P1 generally is taken as between 1.2MPa～1.3MPa, this parameter is relevant with the operating characteristic of heating power expansion valve, if condensing pressure is lower than this value, the height pressure reduction of system is corresponding lower, coolant quantity by expansion valve will significantly reduce, and it is unfavorable that compressor is set up oil pressure.T1 represents the minimum environment temperature of unit operation.
Open corresponding condensing pressure P1 according to first blower fan, make to be parallel to the straight line of abscissa, on the combination condensing pressure-environment temperature curve of two groups of blower fans, obtain the environment temperature T ' of pressure control point correspondence;
According to the environment temperature T ' of pressure control point correspondence, make to be parallel to the straight line of ordinate, on the condensing pressure-environment temperature curve of first blower fan, obtain the condensing pressure value P ' of pressure control point correspondence;
Under this environment temperature, the pressure set points P2 that controls the unlatching of second blower fan must be greater than the condensing pressure value P ' of the pairing pressure control point correspondence of T ' point, simultaneously, consider the situation of force value fluctuation, second blower fan is opened the condensing pressure value P ' that corresponding condensing pressure P2 chooses the pressure control point correspondence and is added certain control parameter in this preferred embodiment.It is relevant that this control parameter and structure of condenser are provided with, and chooses between 0.2MPa～0.3MPa in this preferred embodiment.As can be seen from Figure,, near second blower fan frequent start-stop phenomenon environment temperature T ' will occur, cause fault if get P2＜P '.
Because second blower fan is opened corresponding condensing pressure P2 greater than the pressure control point pressure P ', so when condensing pressure is low, drop into a blower fan and can guarantee the unit operate as normal, when condensing pressure continues to raise, make when condensing pressure reaches the opening pressure P2 of second blower fan, drop into second blower fan, prevent that condensing pressure is too high, can also prevent simultaneously the frequent start-stop of second blower fan, cause the blower fan overload.
Above-mentioned condensing pressure-environment temperature curve and combination condensing pressure-environment temperature curve are determined according to structure of condenser.
Be described in detail below in conjunction with two of 2 pairs of preferred embodiment of the present invention of accompanying drawing.
When air-cooled air-conditioning unit is provided with three groups or more groups of blower fans, the start and stop pressure of many group blower fans can be set by this method.
In this preferred embodiment, air-cooled air-conditioning unit is provided with three groups of blower fans, is respectively first blower fan, second blower fan and the 3rd blower fan, and the opening pressure difference of these three groups of blower fans can drop into one group or organize blower fan work respectively more under different condensing pressures.
Among Fig. 2, ordinate P represents the condensing pressure under the different operating modes, and abscissa T represents environment temperature.The curve in top is represented put into operation operation curve under the situation of first blower fan, and the operation curve that two groups of blower fans of middle representative drop into, a following curve are represented put into operation simultaneously operation curve under the situation of three groups of blower fans.
At first, determine the i.e. opening pressure P1 of first blower fan of first group of blower fan.Minimum condensing pressure when this opening pressure P1 chooses air-cooled air-conditioning unit operate as normal usually, this parameter is relevant with the operating characteristic of heating power expansion valve, if condensing pressure is lower than this value, the height pressure reduction of system is corresponding lower, coolant quantity by expansion valve will significantly reduce, thereby it is unfavorable that compressor is set up oil pressure.
In this preferred embodiment, opening pressure P1 generally is taken as between 1.2MPa～1.3MPa, and T1 represents the minimum environment temperature of unit operation.
Open corresponding condensing pressure P1 according to first blower fan, make to be parallel to the straight line of abscissa, on the combination condensing pressure-environment temperature curve of two groups of blower fans, obtain the environment temperature T ' of pressure control point correspondence;
According to the environment temperature T ' of pressure control point correspondence, make to be parallel to the straight line of ordinate, on the condensing pressure-environment temperature curve of first blower fan, obtain the condensing pressure value P ' of pressure control point correspondence;
Under this environment temperature, the pressure set points P2 that controls the unlatching of second blower fan must be greater than the condensing pressure value P ' of the pairing pressure control point correspondence of T ' point, simultaneously, consider the situation of force value fluctuation, second blower fan is opened corresponding condensing pressure P2 and is chosen for condensing pressure value P ' and adds certain control parameter in this preferred embodiment.It is relevant that this control parameter and structure of condenser are provided with, and chooses between 0.2MPa～0.3MPa in this preferred embodiment.By among Fig. 2 as can be seen, if get P2＜P ', near second blower fan frequent start-stop phenomenon environment temperature T ' will appear, cause fault.
Because second blower fan is opened corresponding condensing pressure P2 greater than the pressure control point pressure P ', so when condensing pressure is low, drop into one group of blower fan and can guarantee the unit operate as normal, when condensing pressure continues to raise, make when condensing pressure reaches the opening pressure P2 of second blower fan, drop into second blower fan, prevent that condensing pressure is too high, can also prevent simultaneously the frequent start-stop of second blower fan, cause the blower fan overload.
Open corresponding condensing pressure P2 according to second blower fan, make to be parallel to the straight line of abscissa, on the combination condensing pressure-environment temperature curve of three groups of blower fans, obtain the environment temperature T3 of the 3rd blower fan correspondence;
Open corresponding environment temperature T3 according to the 3rd blower fan, make straight line, on the condensing pressure-environment temperature curve of two groups of blower fans, obtain the 3rd blower fan and open corresponding condensing pressure P3 perpendicular to ordinate.With reference to choosing of P2, consider the influence of pressure oscillation to the 3rd blower fan, P3 can increase a suitable preset parameter, and this preset parameter is chosen between 0.2MPa～0.3MPa.
Because the 3rd blower fan is opened the condensing pressure P2 of corresponding condensing pressure P3 greater than the second blower fan correspondence, when the unit condensing pressure of actual motion is between P3 and P2, drop into two groups of blower fans and can guarantee the unit operate as normal, if condensing pressure continues to raise, make condensing pressure reach the opening pressure P3 of the 3rd blower fan, can in time drop into the 3rd blower fan, prevent that condensing pressure is too high, can also prevent simultaneously the frequent start-stop of the 3rd blower fan, cause the blower fan overload.
Above-mentioned condensing pressure is relevant with the operating characteristic of heating power expansion valve or compressor, and the combination condensing pressure-environment temperature curve of the condensing pressure of first blower fan-environment temperature curve and three groups of blower fans is determined according to structure of condenser.
Claims (8)
1, a kind of condensation pressure control method comprises the following steps:
A, determine that first blower fan opens corresponding condensing pressure;
B, on the combination condensing pressure-environment temperature curve of blower fan, obtain the environment temperature of pressure control point correspondence according to the condensing pressure of the unlatching correspondence of first blower fan;
C, on the condensing pressure-environment temperature curve of first blower fan, obtain the condensing pressure of pressure control point correspondence according to the environment temperature of pressure control point correspondence;
D, according to the condensing pressure of pressure control point correspondence and control parameter and obtain second blower fan and open corresponding condensing pressure.
2, condensation pressure control method according to claim 1 is characterized in that, it is the minimum condensing pressure of air-conditioning unit operate as normal that described first blower fan is opened corresponding condensing pressure.
3, condensation pressure control method according to claim 2 is characterized in that, it is between 1.2MPa～1.3MPa that described first blower fan is opened corresponding condensing pressure.
4, condensation pressure control method according to claim 1 is characterized in that, described control parameter is determined according to structure of condenser.
5, condensation pressure control method according to claim 4 is characterized in that, described control parameter is between 0.2Mpa to 0.3Mpa.
6, condensation pressure control method according to claim 1 is characterized in that, described condensing pressure-environment temperature curve and combination condensing pressure-environment temperature curve are determined according to structure of condenser.
7, condensation pressure control method according to claim 1 is characterized in that, also comprises:
E, open corresponding condensing pressure according to second blower fan and on the combination condensing pressure-environment temperature curve of three groups of blower fans, obtain the 3rd blower fan and open corresponding environment temperature;
F, open corresponding environment temperature according to the 3rd blower fan and on the condensing pressure-environment temperature curve of two groups of blower fans, obtain the 3rd blower fan and open corresponding condensing pressure.
According to each described condensation pressure control method of claim 1 to 7, it is characterized in that 8, described condensing pressure is relevant with the operating characteristic of heating power expansion valve or compressor.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100081131A CN100447509C (en) | 2006-02-20 | 2006-02-20 | Condensation pressure control method |
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| CNB2006100081131A CN100447509C (en) | 2006-02-20 | 2006-02-20 | Condensation pressure control method |
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| CN101025317A true CN101025317A (en) | 2007-08-29 |
| CN100447509C CN100447509C (en) | 2008-12-31 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103697642A (en) * | 2013-12-31 | 2014-04-02 | 上海爱控自动化设备有限公司 | Automatic control method and system for energy-saving refrigeration of condenser |
| CN107120781A (en) * | 2016-02-25 | 2017-09-01 | 广州市华德工业有限公司 | The cooling system adjustment control method of evaporating type condensing air-conditioner set |
| CN109237747A (en) * | 2018-09-13 | 2019-01-18 | 珠海格力电器股份有限公司 | Unit condensation fan operation control method, device, medium, system and air conditioner |
| CN110243115A (en) * | 2018-03-07 | 2019-09-17 | 浙江盾安机电科技有限公司 | A kind of condensing pressure control system and method |
| CN110332620A (en) * | 2019-05-28 | 2019-10-15 | 广东申菱环境系统股份有限公司 | A kind of control method of air cooled heat pump condensation fan |
| CN110398100A (en) * | 2019-08-21 | 2019-11-01 | 珠海格力电器股份有限公司 | Condensing unit, operation control method and device of variable frequency fan of condensing unit and air conditioner |
| CN111189209A (en) * | 2019-12-25 | 2020-05-22 | 宁波奥克斯电气股份有限公司 | Air conditioner control method |
| CN111895671A (en) * | 2019-05-05 | 2020-11-06 | 维谛技术有限公司 | Air conditioning system |
| CN112902503A (en) * | 2021-02-03 | 2021-06-04 | 四川长虹空调有限公司 | Variable frequency multi-split air conditioning unit heating oil return control method |
| CN113701371A (en) * | 2021-08-03 | 2021-11-26 | 中国核电工程有限公司 | Direct evaporation type refrigerating unit and control method thereof |
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| JP2598080B2 (en) * | 1988-04-28 | 1997-04-09 | 株式会社東芝 | Air conditioner |
| JPH02279956A (en) * | 1989-04-21 | 1990-11-15 | Hitachi Ltd | Heating regenration capacity control device for ice regeneration type heat source device |
| JP2000018738A (en) * | 1998-06-23 | 2000-01-18 | Kobe Steel Ltd | Refrigeration device |
| JP2004245487A (en) * | 2003-02-13 | 2004-09-02 | Mitsubishi Electric Corp | Condensation pressure control device for refrigerating plant |
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- 2006-02-20 CN CNB2006100081131A patent/CN100447509C/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103697642A (en) * | 2013-12-31 | 2014-04-02 | 上海爱控自动化设备有限公司 | Automatic control method and system for energy-saving refrigeration of condenser |
| CN107120781A (en) * | 2016-02-25 | 2017-09-01 | 广州市华德工业有限公司 | The cooling system adjustment control method of evaporating type condensing air-conditioner set |
| CN107120781B (en) * | 2016-02-25 | 2019-09-20 | 广州市华德工业有限公司 | The cooling system adjustment control method of evaporating type condensing air-conditioner set |
| CN110243115A (en) * | 2018-03-07 | 2019-09-17 | 浙江盾安机电科技有限公司 | A kind of condensing pressure control system and method |
| CN110243115B (en) * | 2018-03-07 | 2021-09-28 | 浙江盾安机电科技有限公司 | Condensing pressure control system and method |
| CN109237747A (en) * | 2018-09-13 | 2019-01-18 | 珠海格力电器股份有限公司 | Unit condensation fan operation control method, device, medium, system and air conditioner |
| CN111895671A (en) * | 2019-05-05 | 2020-11-06 | 维谛技术有限公司 | Air conditioning system |
| CN110332620B (en) * | 2019-05-28 | 2021-07-30 | 广东申菱环境系统股份有限公司 | Control method of condensing fan of air-cooled air conditioning unit |
| CN110332620A (en) * | 2019-05-28 | 2019-10-15 | 广东申菱环境系统股份有限公司 | A kind of control method of air cooled heat pump condensation fan |
| CN110398100B (en) * | 2019-08-21 | 2020-09-11 | 珠海格力电器股份有限公司 | Condensing unit, operation control method and device of variable frequency fan of condensing unit and air conditioner |
| CN110398100A (en) * | 2019-08-21 | 2019-11-01 | 珠海格力电器股份有限公司 | Condensing unit, operation control method and device of variable frequency fan of condensing unit and air conditioner |
| CN111189209A (en) * | 2019-12-25 | 2020-05-22 | 宁波奥克斯电气股份有限公司 | Air conditioner control method |
| CN111189209B (en) * | 2019-12-25 | 2021-11-23 | 宁波奥克斯电气股份有限公司 | Air conditioner control method |
| CN112902503A (en) * | 2021-02-03 | 2021-06-04 | 四川长虹空调有限公司 | Variable frequency multi-split air conditioning unit heating oil return control method |
| CN113701371A (en) * | 2021-08-03 | 2021-11-26 | 中国核电工程有限公司 | Direct evaporation type refrigerating unit and control method thereof |
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| CN100447509C (en) | 2008-12-31 |
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