CN115942708A - Control method and control device for two-phase fluid loop - Google Patents
Control method and control device for two-phase fluid loop Download PDFInfo
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Abstract
The present application provides a control method and a control device for a two-phase fluid circuit, the two-phase fluid circuit including: a gear pump, an evaporator, a condenser and a liquid storage tank; an outlet of the liquid storage tank is connected to an inlet of the evaporator through the gear pump, an outlet of the evaporator is connected to an inlet of the condenser, and an outlet of the condenser is connected to an inlet of the liquid storage tank; the method comprises the following steps: acquiring the outlet temperature of the evaporator; and respectively adjusting the rotating speed of the gear pump and the rotating speed of a fan in the condenser based on the outlet temperature and the preset target temperature so as to control the working condition of the two-phase fluid loop to be stable through the gear pump and the condenser. Therefore, the working condition of the two-phase fluid loop is stable through the multi-actuator integrated control of the gear pump and the condenser.
Description
Technical Field
The present application relates to the field of two-phase fluid circuit technology, and in particular, to a control method and a control device for a two-phase fluid circuit.
Background
With the rapid development of electronic information technology, the power consumption of electronic chips represented by CPUs of supercomputers is increasing, and the demand for heat dissipation is also increasing. The heat flow density is rapidly increased to more than 100W/cm2 from the traditional 0-50W/cm2, and even partially reaches 500W/cm2. The capacity of the traditional liquid cooling heat dissipation or air cooling heat dissipation cannot meet the high heat dissipation requirement, and the traditional liquid cooling heat dissipation or air cooling heat dissipation needs a high-power pump or fan, so that the energy consumption is greatly increased.
The two-phase fluid loop can cool the heat source by utilizing the latent heat of the phase change evaporation of the working medium, compared with liquid cooling heat dissipation or air cooling heat dissipation, the heat carrying capacity of unit mass flow and the heat exchange capacity of unit area are greatly improved, the work of a compressor is not needed, the evaporation temperature is higher, the energy consumption is reduced, the COP value is improved, and the problem of condensation and frosting of the evaporator is effectively avoided. Therefore, the two-phase fluid loop is an important technical means for solving the heat dissipation problem of the high-power integrated circuit and the chip in the future. However, since the evaporation of the fluid is vigorous, it is a challenge to effectively control how the two-phase fluid loop remains stable.
Disclosure of Invention
In view of this, an object of the present invention is to provide a control method and a control device for a two-phase fluid circuit, which can stabilize the working condition of the two-phase fluid circuit by integrating and controlling multiple actuators of a gear pump and a condenser.
Embodiments of the present application provide a method of controlling a two-phase fluid circuit, the two-phase fluid circuit comprising: a gear pump, an evaporator, a condenser and a liquid storage tank; an outlet of the liquid storage tank is connected to an inlet of the evaporator through the gear pump, an outlet of the evaporator is connected to an inlet of the condenser, and an outlet of the condenser is connected to an inlet of the liquid storage tank; the control method comprises the following steps:
acquiring the outlet temperature of the evaporator;
and respectively adjusting the rotating speed of the gear pump and the rotating speed of a fan in the condenser based on the outlet temperature and the preset target temperature so as to control the working condition of the two-phase fluid loop to be stable through the gear pump and the condenser.
Further, before the adjusting the rotation speed of the gear pump and the rotation speed of the blower in the condenser respectively based on the outlet temperature and the preset target temperature to control the working condition of the two-phase fluid loop to be stable through the gear pump and the condenser, the control method further comprises:
constructing an integrated control loop of the two-phase fluid loop; the first actuator in the integrated control loop is the gear pump, the second actuator is the fan in the condenser, the controlled object is the evaporator, and the integrated control loop adopts negative feedback control.
Further, the adjusting the rotation speed of the gear pump and the rotation speed of the fan in the condenser respectively based on the outlet temperature and the preset target temperature to control the stable working condition of the two-phase fluid loop through the gear pump and the condenser comprises:
determining a target temperature difference between the outlet temperature and the target temperature;
a controller in the integrated control loop determines flow parameters of air based on the target temperature difference, and sends the flow parameters of the air to the condenser and the arithmetic unit respectively;
the arithmetic unit determines the flow parameter of the liquid working medium based on the flow parameter of the air and sends the flow parameter of the liquid working medium to the gear pump;
the gear pump adjusts the rotating speed of the gear pump according to the received flow parameter of the liquid working medium, and the fan in the condenser adjusts the rotating speed of the fan according to the received flow parameter of the air, so that the outlet temperature of the evaporator in the two-phase fluid loop is controlled to be kept stable through the gear pump and the condenser.
Further, the controller adopts a PID controller.
Further, the arithmetic unit determines the flow parameter of the liquid working medium based on the flow parameter of the air by the following formula:
in the formula, G m Denotes the liquidFlow parameters of the body working medium;
a flow parameter indicative of the air; />
Represents an inlet temperature of the condenser; t is a unit of enviroment Represents the ambient temperature; hs represents the enthalpy of saturated steam; hf represents the enthalpy of the liquid working substance; x represents the outlet dryness of the evaporator; c' and C ′ Is a constant.
Embodiments of the present application also provide a control device for a two-phase fluid circuit, the two-phase fluid circuit including: a gear pump, an evaporator, a condenser and a liquid storage tank; an outlet of the liquid storage tank is connected to an inlet of the evaporator through the gear pump, an outlet of the evaporator is connected to an inlet of the condenser, and an outlet of the condenser is connected to an inlet of the liquid storage tank; the control device includes:
the acquisition module is used for acquiring the outlet temperature of the evaporator;
and the adjusting module is used for respectively adjusting the rotating speed of the gear pump and the rotating speed of the fan in the condenser based on the outlet temperature and the preset target temperature so as to control the working condition of the two-phase fluid loop to be stable through the gear pump and the condenser.
Further, the control device further includes: building a module; the building module is used for:
constructing an integrated control loop of the two-phase fluid loop; the first actuator in the integrated control loop is the gear pump, the second actuator is the fan in the condenser, the controlled object is the evaporator, and the integrated control loop adopts negative feedback control.
Further, when the adjusting module is configured to adjust the rotation speed of the gear pump and the rotation speed of the blower in the condenser based on the outlet temperature and a preset target temperature, respectively, so as to control stable working conditions of the two-phase fluid circuit through the gear pump and the condenser, the adjusting module is configured to:
determining a target temperature difference between the outlet temperature and the target temperature;
a controller in the integrated control loop determines flow parameters of air based on the target temperature difference and respectively sends the flow parameters of the air to the condenser and the arithmetic unit;
the arithmetic unit determines the flow parameter of the liquid working medium based on the flow parameter of the air and sends the flow parameter of the liquid working medium to the gear pump;
the gear pump adjusts the rotating speed of the gear pump according to the received flow parameter of the liquid working medium, and the fan in the condenser adjusts the rotating speed of the fan according to the received flow parameter of the air, so that the outlet temperature of the evaporator in the two-phase fluid loop is controlled to be kept stable through the gear pump and the condenser.
Further, the controller adopts a PID controller.
Further, the arithmetic unit determines the flow parameter of the liquid working medium based on the flow parameter of the air by the following formula:
in the formula, G m Representing a flow parameter of the liquid working medium;
a flow parameter indicative of the air; />
Represents an inlet temperature of the condenser; t is enviroment Represents the ambient temperature; hs represents the enthalpy of saturated steam; hf represents the enthalpy of the liquid working substance; x represents the outlet dryness of the evaporator; c' and C ′ Is a constant.
An embodiment of the present application further provides an electronic device, including: a processor, a memory and a bus, the memory storing machine readable instructions executable by the processor, the processor and the memory communicating over the bus when the electronic device is operating, the machine readable instructions when executed by the processor performing the steps of a method of controlling a two-phase fluid circuit as described above.
Embodiments of the present application also provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of a method of controlling a two-phase fluid circuit as described above.
The embodiment of the application provides a control method and a control device of a two-phase fluid loop, wherein the two-phase fluid loop comprises the following components: a gear pump, an evaporator, a condenser and a liquid storage tank; an outlet of the liquid storage tank is connected to an inlet of the evaporator through the gear pump, an outlet of the evaporator is connected to an inlet of the condenser, and an outlet of the condenser is connected to an inlet of the liquid storage tank; the method comprises the following steps: acquiring the outlet temperature of the evaporator; determining a target temperature difference value based on the outlet temperature, the current ambient temperature and a preset target temperature; and respectively adjusting the rotating speed of the gear pump and the rotating speed of a fan in the condenser based on the target temperature difference so as to control the working condition of the two-phase fluid loop to be stable through the gear pump and the condenser.
Therefore, the working condition of the two-phase fluid loop is stable through the multi-actuator integrated control of the gear pump and the condenser.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 shows a schematic diagram of a two-phase fluid circuit provided by an embodiment of the present application;
FIG. 2 illustrates a flow chart of a method of controlling a two-phase fluid circuit provided by an embodiment of the present application;
FIG. 3 is a block diagram of a control system of an integrated control loop provided in an embodiment of the present application;
fig. 4 shows a control system block diagram of a control loop 1 provided in the embodiment of the present application;
fig. 5 shows a control system block diagram of a control loop 2 provided in the embodiment of the present application;
FIG. 6 is a schematic diagram showing a control apparatus of a two-phase fluid circuit according to an embodiment of the present application;
fig. 7 shows a schematic structural diagram of an electronic device provided in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. Every other embodiment that one skilled in the art can obtain without inventive effort based on the embodiments of the present application falls within the scope of protection of the present application.
Research shows that with the rapid development of electronic information technology, the power consumption of electronic chips represented by CPUs of supercomputers is increasing, and the demand for heat dissipation is also increasing. The heat flow density is rapidly increased to more than 100W/cm2 from the traditional 0-50W/cm2, and even partially reaches 500W/cm2. The capacity of the traditional liquid cooling heat dissipation or air cooling heat dissipation cannot meet the high heat dissipation requirement, and the traditional liquid cooling heat dissipation or air cooling heat dissipation needs a high-power pump or fan, so that the energy consumption is greatly increased.
The two-phase fluid loop can utilize the latent heat of the phase change evaporation of the working medium to cool a heat source, compared with liquid cooling heat dissipation or air cooling heat dissipation, the heat carrying capacity of unit mass flow and the heat exchange capacity of unit area are greatly improved, a compressor is not needed to work, the evaporation temperature is higher, the energy consumption is reduced, the COP value is increased, and the problem of condensation and frosting of an evaporator is effectively avoided. Therefore, the two-phase fluid loop is an important technical means for solving the heat dissipation problem of the high-power integrated circuit and the chip in the future. However, since the evaporation of the fluid is vigorous, it is a challenge to effectively control how the two-phase fluid loop remains stable.
Based on this, the embodiment of the application provides a control method and a control device for a two-phase fluid circuit, which can be integrally controlled by multiple actuators of a gear pump and a condenser, so that the working condition of the two-phase fluid circuit is stable.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a two-phase fluid circuit according to an embodiment of the present disclosure. As shown in fig. 1, the two-phase fluid circuit comprises: a gear pump, an evaporator, a condenser and a liquid storage tank; the two-phase fluid circuit further comprises a connecting pipeline; the outlet of the liquid storage tank is connected to the inlet of the evaporator through the gear pump, the outlet of the evaporator is connected to the inlet of the condenser, and the outlet of the condenser is connected to the inlet of the liquid storage tank.
In specific implementation, the working principle of the two-phase fluid loop is as follows: the liquid working medium in the liquid storage tank is used as a heat carrier and is conveyed into the evaporator under the drive of the working medium pump, heat absorption and phase change heat exchange are carried out in the evaporator, the vaporized liquid working medium enters the condenser through the gas pipeline, the vaporized liquid working medium is condensed into the liquid working medium again in the condenser and releases heat, and the liquid working medium finally enters the liquid storage tank to complete the whole heat absorption and heat release cycle. In this process, in order to secure the operation performance of the two-phase fluid circuit, it is necessary to control the system temperature and pressure of the two-phase fluid circuit. Wherein, the liquid working medium can be R134a. Illustratively, in designing the system parameters of the two-phase fluid loop, at 65 ℃, the saturated vapor pressure of R134a is 1.9MPa, and the whole loop circulation flow resistance, namely the head of the circulation pump, is designed to be 1.0MPa. The whole system is designed to have the pressure resistance of 3.5MPa, the safety valve is positioned at the outlet of the circulating pump, and the air release pressure is 3.0MPa. Meanwhile, when the temperature of R134a is 65 ℃, the latent heat of vaporization is 130.58KJ/Kg, and assuming that the dryness of the outlet of the evaporator is 50%, the mass flow required by calculating 30KW heat transfer quantity is as follows: 0.46kg/s. And at 50 ℃, calculating the required volume flow rate to be 27L/min if the density rho =1020kg/m3 of the liquid working medium. At the moment, the specific volume of the gaseous working medium is 0.00969m3/kg, the flow rate of the gaseous working medium is 133.7L/min, and the volume flow rate of the two-phase fluid at the outlet of the evaporator is 147.2L/min.
Referring to fig. 2, fig. 2 is a flow chart of a control method of a two-phase fluid circuit according to an embodiment of the present application. As shown in fig. 2, a control method provided in an embodiment of the present application includes:
s201, obtaining the outlet temperature of the evaporator.
In implementation, the outlet temperature of the evaporator can be obtained in real time by using a measuring device such as a temperature sensor.
S202, respectively adjusting the rotating speed of the gear pump and the rotating speed of a fan in the condenser based on the outlet temperature and a preset target temperature, so as to control the working condition of the two-phase fluid loop to be stable through the gear pump and the condenser.
In the step, the control target of the working condition of the two-phase fluid loop can be comprehensively set according to the heat dissipation requirement, the working temperature, the selection condition of the working medium and the system characteristic of the two-phase fluid loop.
In specific implementation, before step S202, the control method further includes: an integrated control loop of the two-phase fluid loop is constructed.
Referring to fig. 3, fig. 3 is a block diagram of a control system of an integrated control loop according to an embodiment of the present application, where a first actuator in the integrated control loop is the gear pump, a second actuator is the fan in the condenser, a controlled object is the evaporator, the integrated control loop adopts negative feedback control, and a controller in the integrated loop may adopt a PID controller.
As shown in fig. 3, adjusting the rotation speed of the gear pump and the rotation speed of the fan in the condenser based on the target temperature difference respectively in step S202 to control the stable working condition of the two-phase fluid circuit through the gear pump and the condenser may include:
s2021, determining a target temperature difference value between the outlet temperature and the target temperature.
S2022, the controller in the integrated control loop determines flow parameters of air based on the target temperature difference, and sends the flow parameters of air to the condenser and the arithmetic unit respectively.
S2023, the arithmetic unit determines a flow parameter of the liquid working medium based on the flow parameter of the air, and sends the flow parameter of the liquid working medium to the gear pump.
S2024, the gear pump adjusts the rotating speed of the gear pump according to the received flow parameter of the liquid working medium, and the fan in the condenser adjusts the rotating speed of the fan according to the received flow parameter of the air, so that the gear pump and the condenser jointly control the outlet temperature of the evaporator in the two-phase fluid loop to keep stable.
In a specific implementation, in step S2023, the arithmetic unit may determine the flow parameter of the liquid working medium based on the flow parameter of the air by using the following formula:
in the formula, G m Representing a flow parameter of the liquid working medium;
a flow parameter indicative of the air; />
Represents an inlet temperature of the condenser; t is a unit of enviroment Represents the ambient temperature; hs represents the enthalpy of saturated steam; hf represents the enthalpy of the liquid working substance; x represents the outlet dryness of the evaporator; c' and C ′ Is a constant.
The construction concept of an integrated control loop and the establishment process of a formula for determining a flow parameter of a liquid working medium provided in the embodiments of the present application will be described in detail below.
In order to enable a two-phase fluid circuit to operate stably under rated operating conditions, two basic conditions need to be satisfied: (1) The heat dissipating capacity and the heat absorbing capacity of the two-phase fluid loop system are equal, namely the system is in a heat balance state; (2) In the system, two-phase working medium at the evaporator is in a stable evaporation mode, and the proportion of gaseous working medium at the outlet of the evaporator is generally required to be controlled within a certain range. In order to satisfy the two basic conditions, the heat dissipation capacity of the condenser (generally, the heat of the heat source is considered as an input condition, and the heat source needs to be adapted to the system) and the flow rate of the working medium in the system need to be controlled respectively.
Referring to fig. 4 and 5, fig. 4 is a block diagram of a control system of a control loop 1 according to an embodiment of the present disclosure, and fig. 5 is a block diagram of a control system of a control loop 2 according to an embodiment of the present disclosure. As shown in fig. 4 and 5, first, the two-phase fluid loop control system should be separable into two independent closed-loop control loops on the basis of basic control logic; wherein, control circuit 1 is negative feedback control, and the volume flow that is controlled for liquid working medium, and the executor is the gear pump, realizes through the gear pump speed governing, and the input variable is indirect parameter: condenser inlet temperature-ambient temperature; the control loop 1 is designed to ensure that the flow rate of the liquid working medium can be adapted to the power of the current heat source, so that the dryness of the evaporator outlet is kept within a proper interval. The control loop 2 is also in negative feedback control, the controlled quantity is cooling air quantity, the actuator is a condenser, the speed regulation is realized through a fan in the condenser, and the input variable is the outlet temperature of the evaporator. The control loop 2 is designed to ensure that the heat output of the condenser can be adapted to the power of the current heat source, so that the degree of supercooling at the outlet of the condenser is kept within a proper range.
However, the two independent control loops are not favorable for the consistency of the system, and in an actual physical system, due to the influence of disturbance factors such as environment, opposite control tendencies may occur between the two control loops, which causes the system to be unstable, and leads to a complex system structure and a large lag. The embodiment of the present application therefore requires that the two control loops 1 and 2 are integrated into one control loop and the same measurable physical quantity is used as a feedback input.
In the control loop 1, the control logic is to control the flow rate of the gear pump to adapt to the change of the load, to ensure that the dryness of the outlet of the evaporator is fixed, and the potential input physical quantity is the heat load of the evaporator, but the physical quantity cannot be directly measured, so that in the control loop 1, the condenser inlet temperature and the ambient temperature are measured
The difference in (b) indirectly obtains the magnitude of this physical quantity.
The theoretical basis is as follows:
we believe that the heat leakage of the pipeline in equation (1) is negligible by measures such as pipeline heat preservation, i.e. heat leakage of the pipeline is negligible
And the difference between the average condenser temperature and the condenser inlet temperature is a constant value C, i.e. < >>
Then there are:
namely:
in the above formula, the heat dissipation area A of the condenser c Is a constant determined by the condenser structure, and constant C ′ ＝a c C。
In the control loop 2, the controller will adjust the condenser air volume so that the system energy equation (1) is satisfied at the specified temperature, and the system temperature is in the equilibrium state. Still ignoring system heat leaks, there are:
the calculation formula of the convection heat transfer coefficient of the air side of the outer surface of the integral finned tube, which is provided by Goolin, is as follows:
in the formula, n is approximately equal to-0.28, m is approximately equal to 0.5, the rest are constants, re is Reynolds number, then a c ＝C″u air 0.5 。
Represented by the formula (3-2):
at this time, note that the air flow rate u air Which is in fact the output of the control loop 2. This is because, when the condenser structure is fixed, the air flow rate u is constant air Air flow Air Vdot = flow area a airflow And a flow area A airflow Is a constant.
Finally, all constants in the above equation (6) are combined to obtain:
and because:
then:
in the formula, Q is phase change heat carrying capacity; hs is the enthalpy of saturated steam; hf is the enthalpy of the liquid working medium; x is the dryness of the outlet of the evaporator; g m Representing the flow parameter of the liquid working medium, in particular the mass flow of the liquid working medium,
a flow parameter indicative of the air; />
Represents an inlet temperature of the condenser; t is a unit of enviroment Represents the ambient temperature; c' and C ′ Is a constant.
The above formula (8) illustrates the mass flow G of the liquid working medium m Flow rate of air
And the evaporator outlet quality x, and thus the relationship between control loop 1 and control loop 2, an integrated control loop is obtained in the embodiment of the application shown in fig. 3.
Therefore, after the arithmetic unit receives the air flow parameter determined by the controller through the PID algorithm according to the target temperature difference, the flow parameter of the liquid working medium can be determined according to the deformation formula of the formula (8). The deformation formula of the above equation (8) is:
in the formula, G m Representing a flow parameter of the liquid working medium;
a flow parameter indicative of the air; />
Represents an inlet temperature of the condenser; t is enviroment Represents the ambient temperature; hs represents the enthalpy of saturated steam; hf represents the enthalpy of the liquid working substance; x represents the outlet dryness of the evaporator; c' and C ′ Is a constant.
Wherein, the outlet dryness x of the evaporator can be preset based on a control target, for example, the dryness of the outlet of the evaporator is set to be kept at 50%; inlet temperature of condenser
Ambient temperature T enviroment All can be obtained by real-time measurement by using measurement equipment; enthalpy hs of saturated steam, enthalpy hf, C' and C of liquid working medium ′ The specific numerical value of the two-phase fluid loop can be determined by means of experiments and the like according to the system characteristics (such as the structures of an evaporator and a condenser, the physical properties of a working medium and the like) of the actual two-phase fluid loop.
Therefore, in specific implementation, the arithmetic unit can substitute the flow parameter of the air, the measured physical quantity of each temperature and each specific parameter value determined according to the system characteristics of the actual two-phase fluid loop into the formula, and then the flow parameter of the liquid working medium can be obtained.
By the mode, two originally independent control loops are integrated to form an integrated control loop based on a common measurable physical quantity, namely the outlet temperature of the evaporator as the feedback physical quantity of a control target, so that the control system is simple in structure and stable in performance, and the problem of large system lag caused by different feedback physical quantities is avoided.
Further, after the flow parameter of the liquid working medium is sent to the gear pump and the flow parameter of the air is sent to the condenser, the gear pump and the condenser can both store the mapping relation between the flow parameter and the rotating speed in advance, correspondingly, the gear pump determines and adjusts the rotating speed of the gear pump according to the received flow parameter of the liquid working medium, a fan in the condenser determines and adjusts the rotating speed of the fan according to the received flow parameter of the air, and the outlet temperature of the evaporator in the two-phase fluid loop is controlled together to be kept stable.
The embodiment of the application provides a control method of a two-phase fluid loop, wherein the two-phase fluid loop comprises the following steps: a gear pump, an evaporator, a condenser and a liquid storage tank; an outlet of the liquid storage tank is connected to an inlet of the evaporator through the gear pump, an outlet of the evaporator is connected to an inlet of the condenser, and an outlet of the condenser is connected to an inlet of the liquid storage tank; the method comprises the following steps: acquiring the outlet temperature of the evaporator; determining a target temperature difference value based on the outlet temperature, the current ambient temperature and a preset target temperature; and respectively adjusting the rotating speed of the gear pump and the rotating speed of a fan in the condenser based on the target temperature difference so as to control the working condition of the two-phase fluid loop to be stable through the gear pump and the condenser.
Therefore, the working condition of the two-phase fluid loop is stable and a better control effect is achieved through the multi-actuator integrated control of the gear pump and the condenser in the integrated control loop.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a control device of a two-phase fluid circuit according to an embodiment of the present application. The two-phase fluid circuit comprises: a gear pump, an evaporator, a condenser and a liquid storage tank; the outlet of the liquid storage tank is connected to the inlet of the evaporator through the gear pump, the outlet of the evaporator is connected to the inlet of the condenser, and the outlet of the condenser is connected to the inlet of the liquid storage tank. As shown in fig. 6, the control device 400 includes:
an obtaining module 410, configured to obtain an outlet temperature of the evaporator;
and the adjusting module 420 is configured to adjust the rotation speed of the gear pump and the rotation speed of the fan in the condenser respectively based on the outlet temperature and a preset target temperature, so as to control the working condition of the two-phase fluid loop to be stable through the gear pump and the condenser.
Further, the control device 400 further includes: building a module; the building module is used for:
constructing an integrated control loop of the two-phase fluid loop; the first actuator in the integrated control loop is the gear pump, the second actuator is the fan in the condenser, the controlled object is the evaporator, and the integrated control loop adopts negative feedback control.
Further, when the adjusting module 420 is configured to adjust the rotation speed of the gear pump and the rotation speed of the fan in the condenser based on the outlet temperature and the preset target temperature, respectively, so as to control stable operating conditions of the two-phase fluid circuit through the gear pump and the condenser, the adjusting module 420 is configured to:
determining a target temperature difference between the outlet temperature and the target temperature;
a controller in the integrated control loop determines flow parameters of air based on the target temperature difference and respectively sends the flow parameters of the air to the condenser and the arithmetic unit;
the arithmetic unit determines the flow parameter of the liquid working medium based on the flow parameter of the air and sends the flow parameter of the liquid working medium to the gear pump;
the gear pump adjusts the rotating speed of the gear pump according to the received flow parameters of the liquid working medium, and the fan in the condenser adjusts the rotating speed of the fan according to the received flow parameters of the air, so that the gear pump and the condenser jointly control the outlet temperature of the evaporator in the two-phase fluid loop to keep stable.
Further, the controller adopts a PID controller.
Further, the arithmetic unit determines the flow parameter of the liquid working medium based on the flow parameter of the air by the following formula:
in the formula, G m Representing a flow parameter of the liquid working medium;
a flow parameter indicative of the air; />
Represents an inlet temperature of the condenser; t is enviroment Represents the ambient temperature; hs represents the enthalpy of saturated steam; hf represents the enthalpy of the liquid working substance; x represents the outlet dryness of the evaporator; c' and C ′ Is a constant.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure. As shown in fig. 7, the electronic device 500 includes a processor 510, a memory 520, and a bus 530.
The memory 520 stores machine-readable instructions executable by the processor 510, when the electronic device 500 operates, the processor 510 communicates with the memory 520 through the bus 530, and when the machine-readable instructions are executed by the processor 510, the steps of the method for controlling a two-phase fluid circuit in the method embodiments shown in fig. 1 to fig. 5 can be executed.
Embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method for controlling a two-phase fluid circuit in the method embodiments shown in fig. 1 to 5 may be executed.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the exemplary embodiments of the present application, and are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A control method of a two-phase fluid circuit, characterized in that the two-phase fluid circuit comprises: a gear pump, an evaporator, a condenser and a liquid storage tank; an outlet of the liquid storage tank is connected to an inlet of the evaporator through the gear pump, an outlet of the evaporator is connected to an inlet of the condenser, and an outlet of the condenser is connected to an inlet of the liquid storage tank; the control method comprises the following steps:
acquiring the outlet temperature of the evaporator;
and respectively adjusting the rotating speed of the gear pump and the rotating speed of a fan in the condenser based on the outlet temperature and the preset target temperature so as to control the working condition of the two-phase fluid loop to be stable through the gear pump and the condenser.
2. The control method according to claim 1, wherein before the adjusting the rotation speed of the gear pump and the rotation speed of the fan in the condenser based on the outlet temperature and the preset target temperature, respectively, to control the stable condition of the two-phase fluid circuit through the gear pump and the condenser, the control method further comprises:
constructing an integrated control loop of the two-phase fluid loop; the first actuator in the integrated control loop is the gear pump, the second actuator is the fan in the condenser, the controlled object is the evaporator, and the integrated control loop adopts negative feedback control.
3. The control method according to claim 2, wherein the adjusting the rotation speed of the gear pump and the rotation speed of the fan in the condenser based on the outlet temperature and the preset target temperature respectively to control the stable working condition of the two-phase fluid circuit through the gear pump and the condenser comprises:
determining a target temperature difference between the outlet temperature and the target temperature;
a controller in the integrated control loop determines flow parameters of air based on the target temperature difference and respectively sends the flow parameters of the air to the condenser and the arithmetic unit;
the arithmetic unit determines the flow parameter of the liquid working medium based on the flow parameter of the air and sends the flow parameter of the liquid working medium to the gear pump;
the gear pump adjusts the rotating speed of the gear pump according to the received flow parameters of the liquid working medium, and the fan in the condenser adjusts the rotating speed of the fan according to the received flow parameters of the air, so that the gear pump and the condenser jointly control the outlet temperature of the evaporator in the two-phase fluid loop to keep stable.
4. A control method according to claim 3, characterised in that the controller employs a PID controller.
5. The control method according to claim 3, characterized in that the operator determines the flow parameter of the liquid working substance on the basis of the flow parameter of the air by means of the following formula:
in the formula, G m Representing a flow parameter of the liquid working medium;
a flow parameter indicative of the air; />
Represents an inlet temperature of the condenser; t is emviroment Represents the ambient temperature; hs represents the enthalpy of saturated steam; hf represents the enthalpy of the liquid working substance; x represents the outlet dryness of the evaporator; c '"and C' are constants.
6. A control device for a two-phase fluid circuit, said two-phase fluid circuit comprising: a gear pump, an evaporator, a condenser and a liquid storage tank; an outlet of the liquid storage tank is connected to an inlet of the evaporator through the gear pump, an outlet of the evaporator is connected to an inlet of the condenser, and an outlet of the condenser is connected to an inlet of the liquid storage tank; the control device includes:
the acquisition module is used for acquiring the outlet temperature of the evaporator;
and the adjusting module is used for respectively adjusting the rotating speed of the gear pump and the rotating speed of the fan in the condenser based on the outlet temperature and the preset target temperature so as to control the working condition of the two-phase fluid loop to be stable through the gear pump and the condenser.
7. The control device according to claim 6, characterized by further comprising: building a module; the building module is used for:
constructing an integrated control loop of the two-phase fluid loop; the first actuator in the integrated control loop is the gear pump, the second actuator is the fan in the condenser, the controlled object is the evaporator, and the integrated control loop adopts negative feedback control.
8. The control device of claim 7, wherein the adjustment module, when configured to adjust the rotational speed of the gear pump and the rotational speed of the fan in the condenser based on the outlet temperature and a preset target temperature, respectively, to control the stable operation of the two-phase fluid circuit via the gear pump and the condenser, is configured to:
determining a target temperature difference between the outlet temperature and the target temperature;
a controller in the integrated control loop determines flow parameters of air based on the target temperature difference, and sends the flow parameters of the air to the condenser and the arithmetic unit respectively;
the arithmetic unit determines the flow parameter of the liquid working medium based on the flow parameter of the air and sends the flow parameter of the liquid working medium to the gear pump;
the gear pump adjusts the rotating speed of the gear pump according to the received flow parameter of the liquid working medium, and the fan in the condenser adjusts the rotating speed of the fan according to the received flow parameter of the air, so that the outlet temperature of the evaporator in the two-phase fluid loop is controlled to be kept stable through the gear pump and the condenser.
9. An electronic device, comprising: a processor, a memory and a bus, the memory storing machine readable instructions executable by the processor, the processor and the memory communicating over the bus when the electronic device is in operation, the machine readable instructions when executed by the processor performing the steps of a method of controlling a two-phase fluid circuit according to any one of claims 1 to 5.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of a method of controlling a two-phase fluid circuit according to any one of claims 1 to 5.
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| CN110989803A (en) * | 2019-11-25 | 2020-04-10 | 华为技术有限公司 | Heat dissipation method and electronic equipment |
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| CN110989803A (en) * | 2019-11-25 | 2020-04-10 | 华为技术有限公司 | Heat dissipation method and electronic equipment |
| CN112325495A (en) * | 2020-09-30 | 2021-02-05 | 北京空间飞行器总体设计部 | Instantaneous high heat flux heat dissipation two-phase control method |
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