CN105115196A - VRF air conditioning system recooling circuit flow control method and device - Google Patents
VRF air conditioning system recooling circuit flow control method and device Download PDFInfo
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- CN105115196A CN105115196A CN201510395414.3A CN201510395414A CN105115196A CN 105115196 A CN105115196 A CN 105115196A CN 201510395414 A CN201510395414 A CN 201510395414A CN 105115196 A CN105115196 A CN 105115196A
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Abstract
The invention discloses a VRF air conditioning system recooling circuit flow control method and device; the method comprises the following steps: calculating a pressure difference between two ends of a second electron expansion valve according to pressure values of a first pressure sensor and a second pressure sensor; obtaining a first refrigerant flow of a heating inner machine, and obtaining a second refrigerant flow of a refrigeration inner machine; calculating a third refrigerant flow according to the first and second refrigerant flows; controlling opening degree of the second electron expansion valve according to the pressure difference and the third refrigerant flow. The VRF air conditioning system recooling circuit flow control method can accurately control refrigerating capacity of the refrigeration inner machine.
Description
Technical field
The present invention relates to technical field of electric appliances, particularly a kind of flow control methods of cooling circuit again of multiple on-line system and device.
Background technology
When two pipes system heat-reclamation multi-compressors system is run with main heating mode, through the refrigerant that heat exchanger cools again, a part finally enters the low-voltage tube of off-premises station by electric expansion valve, and another part is by also entering the low-voltage tube of off-premises station after machine heat absorption in refrigeration.
Aperture due to electric expansion valve can affect and enter the refrigerant flow of machine in refrigeration, such as, when electric expansion valve aperture not at that time, the refrigerant flow entering machine in refrigeration is reduced, thus the refrigeration of machine in impact refrigeration.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, one object of the present invention is the flow control methods of cooling circuit again proposing a kind of multiple on-line system, the refrigerating capacity of the interior machine that can accurately control to freeze.
Second object of the present invention is the volume control device of cooling circuit again proposing a kind of multiple on-line system.
The flow control methods of cooling circuit again of the multiple on-line system of embodiment according to a first aspect of the present invention, wherein, described multiple on-line system comprises by First Heat Exchanger, second heat exchanger, the cooling circuit again that first electric expansion valve and the second electric expansion valve are formed, and current divider and the first pressure sensor described in being arranged on again in cooling circuit, second pressure sensor, first temperature sensor and the second temperature sensor, said method comprising the steps of: the pressure differential calculating described second electric expansion valve two ends according to the force value of described first pressure sensor and the second pressure sensor, obtain the first cold medium flux heating interior machine, and obtain the second cold medium flux of machine in refrigeration, the 3rd cold medium flux by described second electric expansion valve is calculated according to described first cold medium flux and described second cold medium flux, according to described pressure differential and described 3rd cold medium flux, the aperture to described second electric expansion valve controls.
According to the flow control methods of cooling circuit again of the multiple on-line system of the embodiment of the present invention, the refrigerant cooled again is made to flow to machine and off-premises station in refrigeration respectively by two pipelines, and electric expansion valve is set on the pipeline flowing to off-premises station, by the pressure differential of the cold medium flux and two ends that obtain this electric expansion valve, and the aperture of electric expansion valve is controlled according to cold medium flux and pressure differential, accurately to the cold medium flux of machine in refrigeration, thus can accurately control the refrigerating capacity of machine in refrigeration by control flow check thus.
In addition, the flow control methods of cooling circuit again of multiple on-line system according to the above embodiment of the present invention can also have following additional technical characteristic:
In one embodiment of the invention, the first cold medium flux that described acquisition heats interior machine specifically comprises: the saturation pressure P obtaining saturated vapor in current divider
c; According to the saturation pressure P of described saturated vapor
cobtain the saturation temperature T of described saturated vapor
cwith the described enthalpy h heating interior machine porch
c; The supercooling temperature T in interior machine exit is heated described in measurement
2Aand pressure P
c; According to the described supercooling temperature T heating interior machine exit
2Aand pressure P
cthe enthalpy h in interior machine exit is heated described in calculating
2A; Heat described in acquisition interior machine windscreen and described in heat the indoor return air temperature T of interior machine
1 heats; According to the saturation temperature T of described saturated vapor
c, enthalpy h
c, described in heat the windscreen of interior machine, described indoor return air temperature T
1 heatswith the described enthalpy h heating interior machine exit
2Athe first cold medium flux of interior machine is heated described in calculating.
Further, by heating the first cold medium flux of interior machine described in following formulae discovery: Gr1=KA
heat* (T
c-T
1 system heat)/(h
c-h
2A), wherein Gr1 is described first cold medium flux, KA
heatfor heating the coefficient of the windscreen inquiry of interior machine described in basis.
In one embodiment of the invention, described the second cold medium flux obtaining machine in refrigeration specifically comprises: the enthalpy h calculating machine porch in described refrigeration according to the force value of the first pressure sensor and the temperature value of described first temperature sensor
m2; The enthalpy h in machine exit in described refrigeration is calculated according to the force value of described second pressure sensor and the temperature value of described second temperature sensor
m3; The saturation temperature T of the refrigerant of machine in described refrigeration is calculated according to the force value of described second pressure sensor
e; Obtain the indoor return air temperature T of machine in the windscreen of machine in described refrigeration and described refrigeration
1 refrigeration; According to the saturation temperature T of described refrigerant
e, the enthalpy h of machine porch in described refrigeration
m2, the enthalpy h in machine exit in described refrigeration
m3, the windscreen of machine and described indoor return air temperature T in described refrigeration
1 refrigerationcalculate the second cold medium flux of machine in described refrigeration.
Further, by the second cold medium flux of machine in refrigeration described in following formulae discovery: Gr2=KA
refrigeration* (T
1 refrigeration-T
e)/(h
m3-h
m2), wherein Gr2 is described second cold medium flux, KA
refrigerationfor the coefficient inquired about according to the windscreen of machine in described refrigeration.
In one embodiment of the invention, by the aperture of the second electric expansion valve described in following formulae discovery: O=A* (Gr3/ (Δ P)
0.5)
2, wherein, O is the aperture of described second electric expansion valve, and Gr3 is described 3rd cold medium flux, and Δ P is described pressure differential, and A is the conclusion constant obtained by experiment.
The volume control device of cooling circuit again of the multiple on-line system of embodiment according to a second aspect of the present invention, wherein, described multiple on-line system comprises by First Heat Exchanger, second heat exchanger, the cooling circuit again that first electric expansion valve and the second electric expansion valve are formed, and current divider and the first pressure sensor described in being arranged on again in cooling circuit, second pressure sensor, first temperature sensor and the second temperature sensor, described device comprises: the first computing module, for calculating the pressure differential at described second electric expansion valve two ends according to the force value of described first pressure sensor and the second pressure sensor, acquisition module, for obtaining the first cold medium flux heating interior machine, and obtains the second cold medium flux of machine in refrigeration, second computing module, for calculating the 3rd cold medium flux by described second electric expansion valve according to described first cold medium flux and described second cold medium flux, control module, for according to described pressure differential and described 3rd cold medium flux, the aperture to described second electric expansion valve controls.
According to the volume control device of cooling circuit again of the multiple on-line system of the embodiment of the present invention, the refrigerant cooled again is made to flow to machine and off-premises station in refrigeration respectively by two pipelines, and electric expansion valve is set on the pipeline flowing to off-premises station, by the pressure differential of the cold medium flux and two ends that obtain this electric expansion valve, and the aperture of electric expansion valve is controlled according to cold medium flux and pressure differential, accurately to the cold medium flux of machine in refrigeration, thus can accurately control the refrigerating capacity of machine in refrigeration by control flow check thus.
In addition, the volume control device of cooling circuit again of multiple on-line system according to the above embodiment of the present invention can also have following additional technical characteristic:
In one embodiment of the invention, described acquisition module is specifically for the saturation pressure P that obtains saturated vapor in current divider
c; According to the saturation pressure P of described saturated vapor
cobtain the saturation temperature T of described saturated vapor
cwith the described enthalpy h heating interior machine porch
c; The supercooling temperature T in interior machine exit is heated described in measurement
2Aand pressure P
c; According to the described supercooling temperature T heating interior machine exit
2Aand pressure P
cthe enthalpy h in interior machine exit is heated described in calculating
2A; Heat described in acquisition interior machine windscreen and described in heat the indoor return air temperature T of interior machine
1 heats; According to the saturation temperature T of described saturated vapor
c, enthalpy h
c, described in heat the windscreen of interior machine, described indoor return air temperature T
1 heatswith the described enthalpy h heating interior machine exit
2Athe first cold medium flux of interior machine is heated described in calculating.
Further, by heating the first cold medium flux of interior machine described in following formulae discovery: Gr1=KA
heat* (T
c-T
1 system heat)/(h
c-h
2A), wherein Gr1 is described first cold medium flux, KA
heatfor heating the coefficient of the windscreen inquiry of interior machine described in basis.
In one embodiment of the invention, described acquisition module is concrete also for the enthalpy h calculating machine porch in described refrigeration according to the force value of the first pressure sensor and the temperature value of described first temperature sensor
m2; The enthalpy h in machine exit in described refrigeration is calculated according to the force value of described second pressure sensor and the temperature value of described second temperature sensor
m3; The saturation temperature T of the refrigerant of machine in described refrigeration is calculated according to the force value of described second pressure sensor
e; Obtain the indoor return air temperature T of machine in the windscreen of machine in described refrigeration and described refrigeration
1 refrigeration; According to the saturation temperature T of described refrigerant
e, the enthalpy h of machine porch in described refrigeration
m2, the enthalpy h in machine exit in described refrigeration
m3, the windscreen of machine and described indoor return air temperature T in described refrigeration
1 refrigerationcalculate the second cold medium flux of machine in described refrigeration.
Further, by the second cold medium flux of machine in refrigeration described in following formulae discovery: Gr2=KA
refrigeration* (T
1 refrigeration-T
e)/(h
m3-h
m2), wherein Gr2 is described second cold medium flux, KA
refrigerationfor the coefficient inquired about according to the windscreen of machine in described refrigeration.
In one embodiment of the invention, by the aperture of the second electric expansion valve described in following formulae discovery: O=A* (Gr3/ (Δ P)
0.5)
2, wherein, O is the aperture of described second electric expansion valve, and Gr3 is described 3rd cold medium flux, and Δ P is described pressure differential, and A is the conclusion constant obtained by experiment.
Accompanying drawing explanation
Fig. 1 is the flow chart of the flow control methods of cooling circuit again of multiple on-line system according to an embodiment of the invention;
Fig. 2 is the structural representation of multiple on-line system according to an embodiment of the invention;
Fig. 3 is the structured flowchart of the volume control device of cooling circuit again of multiple on-line system according to an embodiment of the invention.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
Fig. 1 is the flow chart of the flow control methods of cooling circuit again of multiple on-line system according to an embodiment of the invention.
In an embodiment of the present invention, as shown in Figure 2, multiple on-line system comprises the cooling circuit be again made up of First Heat Exchanger, the second heat exchanger, the first electric expansion valve and the second electric expansion valve, and current divider and be arranged on again the first pressure sensor, the second pressure sensor, the first temperature sensor and the second temperature sensor in cooling circuit.
As shown in Figure 1, the flow control methods of cooling circuit again of the multiple on-line system of the embodiment of the present invention, comprises the following steps:
S101, calculates the pressure differential at the second electric expansion valve two ends according to the force value of the first pressure sensor and the second pressure sensor.
Particularly, the first pressure sensor and the force value measured by the second pressure sensor are the force value at the second electric expansion valve two ends, and the difference of two force value is the pressure differential Δ P at the second electric expansion valve two ends.
S102, obtains the first cold medium flux heating interior machine, and obtains the second cold medium flux of machine in refrigeration.
In one embodiment of the invention, can according to the saturation temperature T of saturated vapor
c, heat the enthalpy h of interior machine porch
c, heat the windscreen of interior machine, heat the indoor return air temperature T of interior machine
1 heatswith the enthalpy h heating interior machine exit
2Athe first cold medium flux heating interior machine is calculated etc. parameter.
For the acquisition process of above each parameter, particularly, by obtaining the saturation pressure P of saturated vapor in current divider
c, and according to the saturation pressure P of saturated vapor
cobtain the saturation temperature T of saturated vapor
cwith the enthalpy h heating interior machine porch
c; By measuring the supercooling temperature T heating interior machine exit
2Aand pressure P
c, and according to heating the supercooling temperature T in interior machine exit
2Aand pressure P
ccalculate the enthalpy h heating interior machine exit
2A, in one embodiment of the invention, heating interior machine can serve as condenser, and pressure in condenser is almost constant, so can according to the supercooling temperature T heating interior machine exit
2Aand pressure P
cobtain the enthalpy h heating interior machine exit
2A; Obtain simultaneously and heat the windscreen of interior machine and heat the indoor return air temperature T of interior machine
1 heats, wherein, the windscreen according to heating interior machine can obtain COEFFICIENT K A by tabling look-up
heat.After each parameter of acquisition, the first cold medium flux of interior machine can be heated according to following formulae discovery:
Gr1=KA
heat* (T
c-T
1 heats)/(h
c-h
2A) (1)
Wherein, Gr1 is the first cold medium flux, KA
heatfor the coefficient inquired about according to the windscreen heating interior machine.
In one embodiment of the invention, can according to the saturation temperature T of the refrigerant of machine in refrigeration
e, the enthalpy h of machine porch in refrigeration
m2, the enthalpy h in machine exit in refrigeration
m3, the windscreen of machine and indoor return air temperature T in refrigeration
1 refrigerationcalculate the second cold medium flux of machine in refrigeration.
For the acquisition process of above each parameter, particularly, the enthalpy h of machine porch in refrigeration can be calculated according to the temperature value of the force value of the first pressure sensor and the first temperature sensor
m2; And the enthalpy h in machine exit in refrigeration is calculated according to the force value of the second pressure sensor and the temperature value of the second temperature sensor
m3; The saturation temperature T of the refrigerant of machine in refrigeration is calculated again according to the force value of the second pressure sensor
e, wherein, T
ebe approximately equal to the temperature of heat exchanger surface in machine in refrigeration; Obtain the windscreen of machine in refrigeration and the indoor return air temperature T of the interior machine of refrigeration simultaneously
1 refrigeration, wherein, can COEFFICIENT K A be obtained according to the windscreen of machine in refrigeration by tabling look-up
refrigeration.After each parameter of acquisition, the second cold medium flux of interior machine can be heated according to following formulae discovery:
Gr2=KA
refrigeration* (T
1 refrigeration-T
e)/(h
m3-h
m2) (2)
Wherein Gr2 is the second cold medium flux, KA
refrigerationfor the coefficient of the windscreen inquiry according to machine in refrigeration.
S103, calculates the 3rd cold medium flux by the second electric expansion valve according to the first cold medium flux and the second cold medium flux.
Particularly, Gr3=Gr1-Gr2, namely the first cold medium flux deducts the second cold medium flux, can obtain the 3rd cold medium flux of the second electric expansion valve.
S104, according to pressure differential and the 3rd cold medium flux, the aperture to the second electric expansion valve controls.
Particularly, by the aperture of following formulae discovery second electric expansion valve:
O＝A*(Gr3/(ΔP)
0.5)
2(3)
Wherein, O is the aperture of the second electric expansion valve, and Gr3 is the 3rd cold medium flux, and Δ P is pressure differential, and A is the conclusion constant obtained by experiment.Thus the aperture to the second electric expansion valve can control according to pressure differential and the 3rd cold medium flux.
According to the flow control methods of cooling circuit again of the multiple on-line system of the embodiment of the present invention, the refrigerant cooled again is made to flow to machine and off-premises station in refrigeration respectively by two pipelines, and electric expansion valve is set on the pipeline flowing to off-premises station, by the pressure differential of the cold medium flux and two ends that obtain this electric expansion valve, and the aperture of electric expansion valve is controlled according to cold medium flux and pressure differential, accurately to the cold medium flux of machine in refrigeration, thus can accurately control the refrigerating capacity of machine in refrigeration by control flow check thus.
For realizing the flow control methods of cooling circuit again of the multiple on-line system of above-described embodiment, the present invention also proposes a kind of volume control device of cooling circuit again of multiple on-line system.
Fig. 3 is the structured flowchart of the volume control device of cooling circuit again of multiple on-line system according to an embodiment of the invention.
In an embodiment of the present invention, as shown in Figure 2, multiple on-line system comprises the cooling circuit be again made up of First Heat Exchanger, the second heat exchanger, the first electric expansion valve and the second electric expansion valve, and current divider and be arranged on again the first pressure sensor, the second pressure sensor, the first temperature sensor and the second temperature sensor in cooling circuit.
As shown in Figure 3, the volume control device of cooling circuit again of the multiple on-line system of the embodiment of the present invention, comprising: the first computing module 10, acquisition module 20, second computing module 30 and control module 40.
Wherein, the first computing module 10 is for calculating the pressure differential at the second electric expansion valve two ends according to the force value of the first pressure sensor and the second pressure sensor.
Particularly, the first pressure sensor and the force value measured by the second pressure sensor are the force value at the second electric expansion valve two ends, and the difference of two force value is the pressure differential Δ P at the second electric expansion valve two ends.
Acquisition module 20 heats the first cold medium flux of interior machine for obtaining, and obtains the second cold medium flux of machine in refrigeration.
In one embodiment of the invention, acquisition module 20 can according to the saturation temperature T of saturated vapor
c, heat the enthalpy h of interior machine porch
c, heat the windscreen of interior machine, heat the indoor return air temperature T of interior machine
1 heatswith the enthalpy h heating interior machine exit
2Athe first cold medium flux heating interior machine is calculated etc. parameter.
Particularly, acquisition module 20 is by obtaining the saturation pressure P of saturated vapor in current divider
c, and according to the saturation pressure P of saturated vapor
cobtain the saturation temperature T of saturated vapor
cwith the enthalpy h heating interior machine porch
c; By measuring the supercooling temperature T heating interior machine exit
2Aand pressure P
c, and according to heating the supercooling temperature T in interior machine exit
2Aand pressure P
ccalculate the enthalpy h heating interior machine exit
2A, in one embodiment of the invention, heating interior machine can serve as condenser, and pressure in condenser is almost constant, so can according to the supercooling temperature T heating interior machine exit
2Aand pressure P
cobtain the enthalpy h heating interior machine exit
2A; Obtain simultaneously and heat the windscreen of interior machine and heat the indoor return air temperature T of interior machine
1 heats, wherein, the windscreen according to heating interior machine can obtain COEFFICIENT K A by tabling look-up
heat.After each parameter of acquisition, the first cold medium flux of interior machine can be heated according to following formulae discovery:
Gr1=KA
heat* (T
c-T
1 heats)/(h
c-h
2A) (1)
Wherein, Gr1 is the first cold medium flux, KA
heatfor the coefficient inquired about according to the windscreen heating interior machine.
In one embodiment of the invention, acquisition module 20 can according to the saturation temperature T of the refrigerant of machine in refrigeration
e, the enthalpy h of machine porch in refrigeration
m2, the enthalpy h in machine exit in refrigeration
m3, the windscreen of machine and indoor return air temperature T in refrigeration
1 refrigerationcalculate the second cold medium flux of machine in refrigeration.
Particularly, acquisition module 20 can calculate the enthalpy h of machine porch in refrigeration according to the temperature value of the force value of the first pressure sensor and the first temperature sensor
m2; And the enthalpy h in machine exit in refrigeration is calculated according to the force value of the second pressure sensor and the temperature value of the second temperature sensor
m3; The saturation temperature T of the refrigerant of machine in refrigeration is calculated again according to the force value of the second pressure sensor
e, wherein, T
ebe approximately equal to the temperature of heat exchanger surface in machine in refrigeration; Obtain the windscreen of machine in refrigeration and the indoor return air temperature T of the interior machine of refrigeration simultaneously
1 refrigeration, wherein, can COEFFICIENT K A be obtained according to the windscreen of machine in refrigeration by tabling look-up
refrigeration.After each parameter of acquisition, the second cold medium flux of interior machine can be heated according to following formulae discovery:
Gr2=KA
refrigeration* (T
1 refrigeration-T
e)/(h
m3-h
m2) (2)
Wherein Gr2 is the second cold medium flux, KA
refrigerationfor the coefficient of the windscreen inquiry according to machine in refrigeration.
Second computing module 30 is for calculating the 3rd cold medium flux by the second electric expansion valve according to the first cold medium flux and the second cold medium flux.
Particularly, Gr3=Gr1-Gr2, namely the first cold medium flux deducts the second cold medium flux, can obtain the 3rd cold medium flux of the second electric expansion valve.
Control module 40 is for according to pressure differential and the 3rd cold medium flux, the aperture to the second electric expansion valve controls.
Particularly, by the aperture of following formulae discovery second electric expansion valve:
O＝A*(Gr3/(ΔP)
0.5)
2(3)
Wherein, O is the aperture of the second electric expansion valve, and Gr3 is the 3rd cold medium flux, and Δ P is pressure differential, and A is the conclusion constant obtained by experiment.Thus the aperture to the second electric expansion valve can control according to pressure differential and the 3rd cold medium flux.
According to the volume control device of cooling circuit again of the multiple on-line system of the embodiment of the present invention, the refrigerant cooled again is made to flow to machine and off-premises station in refrigeration respectively by two pipelines, and electric expansion valve is set on the pipeline flowing to off-premises station, by the pressure differential of the cold medium flux and two ends that obtain this electric expansion valve, and the aperture of electric expansion valve is controlled according to cold medium flux and pressure differential, accurately to the cold medium flux of machine in refrigeration, thus can accurately control the refrigerating capacity of machine in refrigeration by control flow check thus.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In describing the invention, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this description or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (12)
1. the flow control methods of cooling circuit again of a multiple on-line system, it is characterized in that, described multiple on-line system comprises the cooling circuit be again made up of First Heat Exchanger, the second heat exchanger, the first electric expansion valve and the second electric expansion valve, and current divider and the first pressure sensor, the second pressure sensor, the first temperature sensor and the second temperature sensor described in being arranged on again in cooling circuit, said method comprising the steps of:
The pressure differential at described second electric expansion valve two ends is calculated according to the force value of described first pressure sensor and the second pressure sensor;
Obtain the first cold medium flux heating interior machine, and obtain the second cold medium flux of machine in refrigeration;
The 3rd cold medium flux by described second electric expansion valve is calculated according to described first cold medium flux and described second cold medium flux;
According to described pressure differential and described 3rd cold medium flux, the aperture to described second electric expansion valve controls.
2. the flow control methods of cooling circuit again of multiple on-line system as claimed in claim 1, it is characterized in that, the first cold medium flux that described acquisition heats interior machine specifically comprises:
Obtain the saturation pressure P of saturated vapor in current divider
c;
According to the saturation pressure P of described saturated vapor
cobtain the saturation temperature T of described saturated vapor
cwith the described enthalpy h heating interior machine porch
c;
The supercooling temperature T in interior machine exit is heated described in measurement
2Aand pressure P
c;
According to the described supercooling temperature T heating interior machine exit
2Aand pressure P
cthe enthalpy h in interior machine exit is heated described in calculating
2A;
Heat described in acquisition interior machine windscreen and described in heat the indoor return air temperature T of interior machine
1 heats;
According to the saturation temperature T of described saturated vapor
c, enthalpy h
c, described in heat the windscreen of interior machine, described indoor return air temperature T
1 heatswith the described enthalpy h heating interior machine exit
2Athe first cold medium flux of interior machine is heated described in calculating.
3. the flow control methods of cooling circuit again of multiple on-line system as claimed in claim 2, is characterized in that, by heating the first cold medium flux of interior machine described in following formulae discovery:
Gr1=KA
heat* (T
c-T
1 heats)/(h
c-h
2A), wherein Gr1 is described first cold medium flux, KA
heatfor heating the coefficient of the windscreen inquiry of interior machine described in basis.
4. the flow control methods of cooling circuit again of multiple on-line system as claimed in claim 1, is characterized in that, described the second cold medium flux obtaining machine in refrigeration specifically comprises:
The enthalpy h of machine porch in described refrigeration is calculated according to the force value of the first pressure sensor and the temperature value of described first temperature sensor
m2;
The enthalpy h in machine exit in described refrigeration is calculated according to the force value of described second pressure sensor and the temperature value of described second temperature sensor
m3;
The saturation temperature T of the refrigerant of machine in described refrigeration is calculated according to the force value of described second pressure sensor
e;
Obtain the indoor return air temperature T of machine in the windscreen of machine in described refrigeration and described refrigeration
1 refrigeration;
According to the saturation temperature T of described refrigerant
e, the enthalpy h of machine porch in described refrigeration
m2, the enthalpy h in machine exit in described refrigeration
m3, the windscreen of machine and described indoor return air temperature T in described refrigeration
1 refrigerationcalculate the second cold medium flux of machine in described refrigeration.
5. the flow control methods of cooling circuit again of multiple on-line system as claimed in claim 4, is characterized in that, the second cold medium flux by machine in refrigeration described in following formulae discovery:
Gr2=KA
refrigeration* (T
1 refrigeration-T
e)/(h
m3-h
m2), wherein Gr2 is described second cold medium flux, KA
refrigerationfor the coefficient inquired about according to the windscreen of machine in described refrigeration.
6. the flow control methods of cooling circuit again of multiple on-line system as claimed in claim 1, is characterized in that, the aperture by the second electric expansion valve described in following formulae discovery:
O=A* (Gr3/ (Δ P)
0.5)
2, wherein, O is the aperture of described second electric expansion valve, and Gr3 is described 3rd cold medium flux, and Δ P is described pressure differential, and A is the conclusion constant obtained by experiment.
7. the volume control device of cooling circuit again of a multiple on-line system, it is characterized in that, described multiple on-line system comprises the cooling circuit be again made up of First Heat Exchanger, the second heat exchanger, the first electric expansion valve and the second electric expansion valve, and current divider and the first pressure sensor, the second pressure sensor, the first temperature sensor and the second temperature sensor described in being arranged on again in cooling circuit, described device comprises:
First computing module, for calculating the pressure differential at described second electric expansion valve two ends according to the force value of described first pressure sensor and the second pressure sensor;
Acquisition module, for obtaining the first cold medium flux heating interior machine, and obtains the second cold medium flux of machine in refrigeration;
Second computing module, for calculating the 3rd cold medium flux by described second electric expansion valve according to described first cold medium flux and described second cold medium flux;
Control module, for according to described pressure differential and described 3rd cold medium flux, the aperture to described second electric expansion valve controls.
8. the volume control device of cooling circuit again of multiple on-line system as claimed in claim 7, is characterized in that, described acquisition module specifically for:
Obtain the saturation pressure P of saturated vapor in current divider
c;
According to the saturation pressure P of described saturated vapor
cobtain the saturation temperature T of described saturated vapor
cwith the described enthalpy h heating interior machine porch
c;
The supercooling temperature T in interior machine exit is heated described in measurement
2Aand pressure P
c;
According to the described supercooling temperature T heating interior machine exit
2Aand pressure P
cthe enthalpy h in interior machine exit is heated described in calculating
2A;
Heat described in acquisition interior machine windscreen and described in heat the indoor return air temperature T of interior machine
1 heats;
According to the saturation temperature T of described saturated vapor
c, enthalpy h
c, described in heat the windscreen of interior machine, described indoor return air temperature T
1 heatswith the described enthalpy h heating interior machine exit
2Athe first cold medium flux of interior machine is heated described in calculating.
9. the volume control device of cooling circuit again of multiple on-line system as claimed in claim 8, is characterized in that, by heating the first cold medium flux of interior machine described in following formulae discovery:
Gr1=KA
heat* (T
c-T
1 heats)/(h
c-h
2A), wherein Gr1 is described first cold medium flux, KA
heatfor heating the coefficient of the windscreen inquiry of interior machine described in basis.
10. the volume control device of cooling circuit again of multiple on-line system as claimed in claim 7, is characterized in that, described acquisition module concrete also for:
The enthalpy h of machine porch in described refrigeration is calculated according to the force value of the first pressure sensor and the temperature value of described first temperature sensor
m2;
The enthalpy h in machine exit in described refrigeration is calculated according to the force value of described second pressure sensor and the temperature value of described second temperature sensor
m3;
The saturation temperature T of the refrigerant of machine in described refrigeration is calculated according to the force value of described second pressure sensor
e;
Obtain the indoor return air temperature T of machine in the windscreen of machine in described refrigeration and described refrigeration
1 refrigeration;
According to the saturation temperature T of described refrigerant
e, the enthalpy h of machine porch in described refrigeration
m2, the enthalpy h in machine exit in described refrigeration
m3, the windscreen of machine and described indoor return air temperature T in described refrigeration
1 refrigerationcalculate the second cold medium flux of machine in described refrigeration.
The volume control device of cooling circuit again of 11. multiple on-line system as claimed in claim 10, is characterized in that, the second cold medium flux by machine in refrigeration described in following formulae discovery:
Gr2=KA
refrigeration* (T
1 refrigeration-T
e)/(h
m3-h
m2), wherein Gr2 is described second cold medium flux, KA
refrigerationfor the coefficient inquired about according to the windscreen of machine in described refrigeration.
The volume control device of cooling circuit again of 12. multiple on-line system as claimed in claim 7, is characterized in that, the aperture by the second electric expansion valve described in following formulae discovery:
O=A* (Gr3/ (Δ P)
0.5)
2, wherein, O is the aperture of described second electric expansion valve, and Gr3 is described 3rd cold medium flux, and Δ P is described pressure differential, and A is the conclusion constant obtained by experiment.
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| CN105972860A (en) * | 2016-04-29 | 2016-09-28 | 广东美的暖通设备有限公司 | Multi-split system and valve control method of supercooling return circuit of multi-split system |
| CN111397179A (en) * | 2020-03-31 | 2020-07-10 | 广东美的暖通设备有限公司 | Control method and device of air conditioning system and air conditioning system |
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| CN101666559A (en) * | 2006-03-27 | 2010-03-10 | 三菱电机株式会社 | Refrigerating and air-conditioning plant |
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| CN105972860A (en) * | 2016-04-29 | 2016-09-28 | 广东美的暖通设备有限公司 | Multi-split system and valve control method of supercooling return circuit of multi-split system |
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|---|---|
| CN105115196B (en) | 2018-04-06 |
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