CN107466187B - Liquid cooling heat exchange device and control method thereof - Google Patents
Liquid cooling heat exchange device and control method thereof Download PDFInfo
- Publication number
- CN107466187B CN107466187B CN201710670985.2A CN201710670985A CN107466187B CN 107466187 B CN107466187 B CN 107466187B CN 201710670985 A CN201710670985 A CN 201710670985A CN 107466187 B CN107466187 B CN 107466187B
- Authority
- CN
- China
- Prior art keywords
- water
- heat exchanger
- frequency
- loop
- primary side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures
- H05K7/20281—Thermal management, e.g. liquid flow control
Abstract
The invention discloses a liquid cooling heat exchange device and a control method thereof, wherein the liquid cooling heat exchange device comprises a heat exchanger, a secondary side water loop for cooling external equipment, a primary side water loop for cooling the secondary side water loop, and an adjusting device for adjusting the primary side water loop so that the outlet water temperature of the secondary side water loop reaches a preset temperature; the primary side water loop and the secondary side water loop are respectively connected with two ends of the heat exchanger, and the primary side water loop and the secondary side water loop are both connected with the adjusting device. According to the invention, the bypass control valve is regulated to regulate the flow rate of the primary side water loop flowing into the heat exchanger, and the frequency converter is regulated to regulate the rotation speed of the water pump, so that the outlet water temperature of the secondary side water loop is kept at a preset temperature, thereby avoiding the influence of various interferences such as traffic volume, environmental change and the like on the controlled parameter, stabilizing the controlled temperature on a set value and ensuring that the liquid cooling system always maintains higher temperature control quality.
Description
Technical Field
The invention relates to the technical field of liquid cooling heat exchange structures, in particular to a liquid cooling heat exchange device and a control method thereof.
Background
At present, the liquid cooling system provides a new solution for heat dissipation of high heat flux density electronic devices by high heat dissipation efficiency, can effectively solve the problem of heat dissipation of high-power consumption equipment, enables the equipment to obtain more reliable working temperature and lower energy consumption, and has been developed and applied in a plurality of fields such as data centers, servers and the like.
However, in the existing temperature control technology, regarding the liquid cooling system, a primary side water loop and a secondary side water loop are additionally arranged at two ends of a heat exchanger, and the primary side water loop flows into the heat exchanger to cool the secondary side water loop, so that the water outlet temperature of the secondary side water loop is reduced, and therefore, when the secondary side water loop cools external equipment such as a server or the like, the cooling system is still limited to a simple temperature feedback control system, and when the external equipment such as the server or the like cools, the service bearing capacity of the CPU of the server suddenly increases in the liquid cooling system, the water temperature of a water inlet pipe of the secondary side water loop entering the heat exchanger can be directly caused to rise, or the water supply temperature of the primary side water loop to the heat exchanger is influenced by the rise of the ambient temperature, and the water outlet temperature of the secondary side water loop can be caused to rise. The existing liquid cooling system cannot timely regulate and control the water supply temperature of the secondary side water loop to the server according to the interference changes, and cannot realize liquid cooling high-precision constant-temperature cooling.
Accordingly, the prior art is still in need of improvement and development.
Disclosure of Invention
The invention aims to solve the technical problems, and aims to provide a liquid cooling heat exchange device and a control method thereof, which aim to timely regulate and control a liquid cooling system when the liquid cooling system cannot supply cold at constant temperature due to temperature change caused by external influence.
The technical scheme adopted for solving the technical problems is as follows:
the liquid cooling heat exchange device comprises a heat exchanger, a secondary side water loop for cooling external equipment, a primary side water loop for cooling the secondary side water loop, and an adjusting device for adjusting the primary side water loop to enable the outlet water temperature of the secondary side water loop to reach a preset temperature; the primary side water loop and the secondary side water loop are respectively connected with two ends of the heat exchanger, and the primary side water loop and the secondary side water loop are both connected with the adjusting device.
The liquid cooling heat exchange device comprises a power supply, a controller connected with the power supply, a water flow control device, a first flowmeter and a second flowmeter, wherein the first flowmeter is used for detecting water flow of a secondary water loop at one side in the heat exchanger; the water flow control device and the first flowmeter are arranged at the water inlet end of the primary side water loop and are positioned outside the heat exchanger; the second flowmeter is arranged at the water outlet end of the secondary side water loop and is positioned outside the heat exchanger; the water outlet end of the primary side water loop outside the heat exchanger is also connected with the water flow control device; a primary side temperature detection device is arranged on the primary side water loop; the secondary side water loop is provided with a secondary side temperature detection device; the water flow control device, the first flowmeter, the second flowmeter, the primary side temperature detection device and the secondary side temperature detection device are all connected with the controller.
The liquid cooling heat exchange device comprises a water flow control device, a liquid cooling heat exchange device and a water flow control device, wherein the water flow control device comprises a variable-frequency water pump device and a bypass control valve; the bypass control valve is positioned between the variable-frequency water pump device and the heat exchanger; and the water outlet end of the primary side water loop outside the heat exchanger is connected with the bypass control valve.
The liquid cooling heat exchange device comprises a variable frequency water pump device and a liquid cooling heat exchange device, wherein the variable frequency water pump device comprises a water pump and a frequency converter; the water pump is arranged at the water inlet end of the primary side water loop; one end of the frequency converter is connected with the controller, and the other end of the frequency converter is connected with the water pump.
The liquid cooling heat exchange device is characterized in that the bypass control valve is a three-way valve.
A control method based on a liquid cooling heat exchange device comprises the following steps:
A. detecting and acquiring the water outlet temperature T1 of a secondary side water loop connected with the heat exchanger, comparing the T1 with a preset temperature T, and judging whether the T1 is equal to the preset temperature T or not;
B. when T1 is not equal to the preset temperature, calculating the water flow L' of a primary side water loop in the heat exchanger when T1 reaches T;
C. detecting a primary side water loop connected with the heat exchanger, acquiring water flow L of the primary side water loop in the heat exchanger, comparing L with L ', and adjusting a water flow control device which is arranged at the water inlet end of the primary side water loop and is positioned outside the heat exchanger according to the comparison result of L and L ', until the water flow of the primary side water loop in the heat exchanger is equal to L '.
The control method based on the liquid cooling heat exchange device, wherein the step A further comprises the following steps:
a00, detecting and acquiring a water outlet temperature signal of a secondary side water loop, a water flow signal of the secondary side water loop, a water flow signal of a primary side water loop in a heat exchanger and an outdoor wet bulb temperature;
a01, setting the water outlet temperature of the secondary side water loop to be the preset temperature T according to the acquired water outlet temperature signal of the secondary side water loop, the water flow signal of the primary side water loop in the heat exchanger and the outdoor wet bulb temperature.
The control method based on the liquid cooling heat exchange device, wherein the step C specifically comprises the following steps:
when L is smaller than L ', calculating the water flow L' of a primary side water loop in the heat exchanger when the opening of a valve on the bypass control valve facing the heat exchanger is maximum and the frequency of the variable-frequency water pump device is the lowest allowable frequency, comparing L 'with L', and correspondingly adjusting the water flow control device according to a comparison result;
and C2, when L 'is smaller than L, calculating the water flow L' of a primary side water loop in the heat exchanger when the opening of the valve on the bypass control valve facing the heat exchanger is maximum and the frequency of the variable-frequency water pump device is the lowest allowable frequency, comparing L 'with L', and correspondingly adjusting the water flow control device according to the comparison result.
The control method based on the liquid cooling heat exchange device, wherein the step C1 specifically comprises the following steps:
when L ' is smaller than L ', acquiring the current water flow passing through a variable-frequency water pump device in the water flow control device, the current valve opening of a bypass control valve connected with the variable-frequency water pump device in the water flow control device towards the heat exchanger side, the current water inlet temperature of a secondary side water loop, the current water inlet temperature of a primary side water loop in the heat exchanger and the current water outlet temperature of the primary side water loop in the heat exchanger, calculating the frequency of the variable-frequency water pump device when the valve opening of the bypass control valve towards the heat exchanger side is maximum and the water flow of the primary side water loop in the heat exchanger is L ', adjusting the valve opening of the bypass control valve towards the heat exchanger side to be maximum, and correspondingly adjusting the variable-frequency water pump device;
and C12, when L 'is smaller than L', acquiring the current water flow passing through a variable-frequency water pump device in the water flow control device, the current valve opening of a bypass control valve connected with the variable-frequency water pump device in the water flow control device and facing to the heat exchanger side, the current water inlet temperature of a secondary side water loop, the current water inlet temperature of a primary side water loop in the heat exchanger and the current water outlet temperature of the primary side water loop in the heat exchanger, calculating the valve opening of the bypass control valve and correspondingly adjusting the bypass control valve under the current water flow passing through the variable-frequency water pump device in the water flow control device.
The control method based on the liquid cooling heat exchange device, wherein the step C2 specifically comprises the following steps:
c21 ' is smaller than L ', the current water flow passing through a variable-frequency water pump device in the water flow control device, the opening of a valve facing the heat exchanger side on a bypass control valve connected with the variable-frequency water pump device in the water flow control device, the water inlet temperature of a current secondary side water loop, the water inlet temperature of a primary side water loop in the current heat exchanger and the water outlet temperature of a primary side water loop in the current heat exchanger are obtained, the frequency of the variable-frequency water pump device is calculated on the premise that the opening of the valve facing the heat exchanger side on the bypass control valve connected with the variable-frequency water pump device in the water flow control device is the water flow of the primary side water loop in the heat exchanger is L ', and the variable-frequency water pump device is correspondingly regulated;
and C22, when L ' is smaller than L ', acquiring the current water flow passing through a variable-frequency water pump device in the water flow control device, the current valve opening of a bypass control valve connected with the variable-frequency water pump device in the water flow control device, which is towards the heat exchanger side, the current water inlet temperature of a secondary side water loop, the current water inlet temperature of a primary side water loop in the heat exchanger and the current water outlet temperature of the primary side water loop in the heat exchanger, calculating the frequency of the variable-frequency water pump device, and when the frequency of the variable-frequency water pump device is regulated to the lowest allowable frequency and the water flow of the primary side water loop in the heat exchanger is L ', regulating the frequency of the variable-frequency water pump device to the smallest allowable frequency by the valve opening of the bypass control valve, and correspondingly regulating the valve opening of the bypass control valve, which is towards the heat exchanger side.
The beneficial effects are that: compared with the prior art, the invention detects the primary side water loop through the adjusting device, and respectively obtains the water flow L of the primary side water loop in the heat exchanger and the water flow L ' of the primary side water loop in the heat exchanger when the water outlet temperature of the secondary side water loop connected with the heat exchanger reaches the preset temperature, compares L with L ', adjusts the water flow of the primary side water loop flowing into the heat exchanger through the bypass control valve under the temperature feedback adjusting effect according to the comparison result of L and L ', and simultaneously adjusts the rotating speed of the water pump through the frequency converter, so that the water outlet temperature of the secondary side water loop is kept at the preset temperature, thereby avoiding the influence of various interferences such as business volume, environmental change and the like on the controlled parameter, stabilizing the controlled temperature on the set value, and ensuring that the liquid cooling system always keeps higher temperature control quality.
Drawings
FIG. 1 is a schematic diagram of a liquid-cooled heat exchanger apparatus according to the present invention;
FIG. 2 is a flow chart of a control method based on a liquid-cooled heat exchange device in the invention;
fig. 3 is a functional block diagram of a liquid-cooled heat exchanger apparatus according to the present invention.
Detailed Description
The invention provides a liquid cooling heat exchange device and a control method thereof, which are used for making the purposes, technical schemes and advantages of the invention clearer and more definite, and the invention is further described in detail below by referring to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention will be further described by the description of embodiments with reference to the accompanying drawings.
The invention provides a liquid cooling heat exchange device, as shown in fig. 1 and 3, which comprises a heat exchanger 1, a secondary side water loop 2 for cooling external equipment, a primary side water loop 3 for cooling the secondary side water loop 2, and an adjusting device for adjusting the primary side water loop 3 to enable the water outlet temperature of the secondary side water loop 2 to reach a preset temperature; the primary side water loop 3 and the secondary side water loop 2 are respectively connected with two ends of the heat exchanger 1, and the primary side water loop 3 and the secondary side water loop 2 are both connected with the regulating device.
Preferably, the liquid cooling heat exchange device further comprises a timing device, and the timing device is connected with the adjusting device, so that the adjusting device detects and correspondingly adjusts the outlet water temperature of the secondary side water loop 2 every other preset time; furthermore, in order to realize constant temperature cooling of the liquid cooling heat exchange device to external equipment, the adjusting device can detect the outlet water temperature of the secondary side water loop 2 in real time and correspondingly adjust the outlet water temperature.
The liquid cooling heat exchange device comprises a power supply 4, a controller 5 connected with the power supply 4, a water flow control device, a first flowmeter 6 and a second flowmeter 7, wherein the first flowmeter 6 is used for detecting the water flow of a secondary water loop 3 at one side in the heat exchanger 1; the water flow control device and the first flowmeter 6 are both arranged at the water inlet end 31 of the primary side water loop and are positioned outside the heat exchanger 1; the second flowmeter 7 is arranged at the water outlet end 22 of the secondary side water loop and is positioned outside the heat exchanger 1; the water outlet end 32 of the primary side water loop outside the heat exchanger 1 is also connected with the water flow control device; a primary side temperature detection device is arranged on the primary side water loop 3; the secondary side water loop 2 is provided with a secondary side temperature detection device; the water flow control device, the first flowmeter 6, the second flowmeter 7, the primary side temperature detection device and the secondary side temperature detection device are all connected with the controller 5; the timing device is connected to the controller 5.
The adjusting device further comprises a human-computer interface 100, the human-computer interface 100 is connected with the controller 5, and a worker can adjust the preset time interval of the timing device through the human-computer interface 100; the human-computer interface 100 may also display the current working state of the liquid-cooled heat exchange device. The liquid cooling heat exchange device also comprises an upper computer 200; the upper computer 200 is connected with the controller 5.
Further, the primary side temperature detecting device comprises a primary side water inlet temperature sensor 33 and a primary side water outlet temperature sensor 34; the primary side water temperature sensor 33 is arranged at the water inlet end 31 of the primary side water circuit and is positioned between the first flowmeter 6 and the heat exchanger 1; the primary side water outlet temperature sensor 34 is arranged at the water outlet end of the primary side water loop; the primary side water inlet temperature sensor 33 and the primary side water outlet temperature sensor 34 are both connected to the controller 5. The secondary side temperature detection device comprises a secondary side water inlet temperature sensor 23 and a secondary side water outlet temperature sensor 24; the secondary side water temperature sensor 23 is arranged at the water inlet end 21 of the secondary side water loop; the secondary side water outlet temperature sensor 24 is arranged at the water outlet end 22 of the secondary side water loop; the secondary side water inlet temperature sensor 23 and the secondary side water outlet temperature sensor 24 are both connected with the controller 5.
The water flow control device comprises a variable-frequency water pump device and a bypass control valve 9; the bypass control valve 9 is positioned between the variable-frequency water pump device and the heat exchanger 1; the primary water outlet end outside the heat exchanger 1 is connected with the bypass control valve 9. The variable-frequency water pump device comprises a water pump 8 and a frequency converter 81; the water pump 8 is arranged at the water inlet end 31 of the primary side water loop; one end of the frequency converter 81 is connected with the controller 5, and the other end is connected with the water pump 8. The bypass control valve 9 is a three-way valve.
Before the adjusting device detects the outlet water temperature of the secondary side water circuit 2 and determines whether adjustment is needed and corresponding adjustment is needed, the controller 5 controls the secondary side outlet water temperature sensor 24 and the first flowmeter 6 to be started, detects the outlet water temperature of the secondary side water circuit 2, obtains the outlet water temperature signal of the secondary side water circuit 2, the water flow signal of the secondary side water circuit 2 and the water flow signal of the primary side water circuit 3 in the heat exchanger 1, and the controller 5 calculates the current outdoor wet bulb humidity according to the current outdoor environment temperature and humidity. The controller 5 brings the obtained water outlet temperature signal of the secondary side water loop 2 and the obtained water flow signal of the primary side water loop 3 in the heat exchanger 1 into PID control variables, and then sets the water outlet temperature of the secondary side water loop 2 to be the preset temperature T according to a PID algorithm by referring to the local outdoor annual average wet bulb humidity and the normal working temperature range of external equipment, so that the preset temperature T is greater than the sum of the current outdoor wet bulb humidity and a preset fixed deviation and is smaller than the difference between the working temperature upper limit value of the external equipment and the preset fixed deviation, and brings the preset temperature T into a PID given value.
When the preset time set by the timing device arrives, the controller 5 compares T1 with T, judges whether T1 is equal to T, and if so, does not perform an adjustment action; if not, the controller 5 obtains the frequency of the current frequency converter 81 and calculates the current water flow L11 flowing through the water pump 8 according to the frequency of the current frequency converter 81; the controller 5 further obtains a valve opening L2 facing the heat exchanger 1 side at the bypass control valve 9, a water inlet temperature T3 of the primary water circuit 3 detected by the primary water inlet temperature sensor 33, a water outlet temperature T4 of the primary water circuit 3 detected by the primary water outlet temperature sensor 34, a water flow L of the primary water circuit 3 in the heat exchanger 1 detected by the first flowmeter 6, a water inlet temperature T2 of the secondary water circuit 2 detected by the secondary water temperature sensor 23, a water outlet temperature T1 of the secondary water circuit 2 detected by the secondary water outlet temperature sensor 24, and a water flow Le of the secondary water circuit 2 detected by the second flowmeter 7 (the water outlet temperature of the secondary water circuit 2 is adjusted in the present invention, i.e., le is not adjusted). The controller 5 may calculate according to a heat exchange flow feedforward-temperature feedback composite control system, a flow temperature difference method heat exchange calculation principle, a heat exchange energy conservation law and a PID control algorithm to obtain a water flow L 'of the primary side water loop 3 in the heat exchanger 1 when the outlet water temperature of the secondary side water loop 2 is T, and then calculate according to the flow temperature difference method heat exchange calculation principle and the heat exchange energy conservation law, i.e., l×4-T3) =le×2-T1, when T1 reaches T, l=l', when T1 deviates from T, T2 and T1 are changed in association, and on the premise that Le is a constant value, L values (T3, T4 and L are changed in association) need to be adjusted to change T1 in a direction approaching T; secondly, carrying out data comparison analysis on L and L ', calculating the frequency of the water pump 8 and the valve opening of the bypass control valve 9 towards the heat exchanger 1 side when the water flow of the primary side water loop 3 in the heat exchanger 1 is L' by adopting a PID setting method, and correspondingly adjusting the frequency converter 81 and the bypass control valve 9 through the controller 5. The specific adjusting process is as follows:
when L is smaller than L', the water flow of the primary side water loop 3 in the heat exchanger 1 is smaller, and the controller 5 preferably regulates L2 to be larger. The controller 5 calculates, according to a PID control algorithm, that when the opening of the valve on the bypass control valve 9 toward the heat exchanger 1 is maximized and the frequency of the variable frequency water pump 8 is the lowest allowable frequency, the water flow rate l″ of the primary water circuit 3 in the heat exchanger 1 is compared with L' (when the opening of the valve on the bypass control valve 9 toward the heat exchanger 1 is maximized, the water flowing through the water pump 8 does not flow to the return water end of the primary water circuit 3 any more, but flows into the heat exchanger 1 all through the valve on the bypass control valve 9 toward the heat exchanger 1:
when L "is smaller than L', even if the opening of the valve on the bypass control valve 9 facing the heat exchanger 1 is adjusted to the maximum, the water flow rate of the primary water inlet loop in the heat exchanger 1 is still small, and at this time, the frequency of the water pump 8 needs to be adjusted, so that the water flow rate passing through the water pump 8 is increased. The controller 5 obtains the current water flow passing through a variable-frequency water pump device in the water flow control device, the opening of a valve facing the heat exchanger side on a bypass control valve connected with the variable-frequency water pump device in the current water flow control device, the water inlet temperature T2 of a current secondary side water loop 2, the water inlet temperature T3 of a primary side water loop 1 in the current heat exchanger and the water outlet temperature T4 of a primary side water loop in the current heat exchanger, and adjusts PID parameters by combining a damping curve method and an empirical test method through a closed-loop transfer function relation and interference complete compensation requirement in a heat exchange flow feedforward-temperature feedback composite control system, the gain factor P value, the integral action value and the differential action value are respectively determined, then according to the PID automatic regulation result, when the valve opening of the bypass control valve 9 facing the heat exchanger 1 side is regulated to be maximum and the water flow of the primary side water loop 3 in the heat exchanger 1 is L ', the frequency of the water pump 8 is calculated, and converted into an analog electric signal form and output to the frequency converter 81, meanwhile, the frequency converter 81 converts the received electric signal into a frequency signal, correspondingly regulates the running rotating speed of the water pump 8, and regulates the valve opening of the bypass control valve 9 facing the heat exchanger 1 side to be maximum until the water flow of the primary side water loop 3 in the heat exchanger 1 is equal to L'.
When L' is smaller than L ", the valve opening of the bypass control valve 9 toward the heat exchanger 1 is only required to be adjusted. The controller 5 obtains the current water flow passing through the variable-frequency water pump device in the water flow control device, the current valve opening facing the heat exchanger side on the bypass control valve connected with the variable-frequency water pump device in the water flow control device, the current water inlet temperature T2 of the secondary side water circuit 2, the current water inlet temperature T3 of the primary side water circuit 1 in the heat exchanger and the current water outlet temperature T4 of the primary side water circuit in the heat exchanger, then the closed-loop transfer function relation and the interference complete compensation requirement in the heat exchange flow feedforward-temperature feedback composite control system are utilized, PID parameters are set by combining an attenuation curve method and an empirical test method, the gain factor P value, the integral action value and the differential action value are respectively determined, then the valve opening facing the heat exchanger 1 side on the bypass control valve 9 required on the premise of the current water flow passing through the variable-frequency water pump device in the water flow control device is calculated according to the PID automatic adjustment result, and the bypass control valve 9 is correspondingly adjusted until the water flow of the primary side water circuit 3 in the heat exchanger 1 is equal to L'.
When L' is smaller than L, the water flow of the primary side water loop 3 in the heat exchanger 1 is more, and the controller 5 preferentially adjusts the operation frequency of the water pump 8, but does not adjust the opening of the valve on the bypass control valve 9 towards the heat exchanger 1 side. The controller 5 calculates the water flow rate l″ of the primary side water circuit 3 in the heat exchanger 1 when the valve opening of the bypass control valve 9 toward the heat exchanger 1 reaches the maximum and the frequency of the variable frequency water pump 8 is the minimum allowable frequency according to the PID control algorithm, and compares l″ with L':
when L "is smaller than L ', the controller 5 obtains the current water flow passing through the variable-frequency water pump device in the water flow control device, the valve opening facing the heat exchanger side on the bypass control valve connected with the variable-frequency water pump device in the current water flow control device, the current water inlet temperature T2 of the secondary side water circuit, the current water inlet temperature T3 of the primary side water circuit in the heat exchanger, and the current water outlet temperature T4 of the primary side water circuit in the heat exchanger, and adjusts the PID parameters by combining the decay curve method and the empirical test method, respectively determines the gain coefficient P value, the integral action value and the differential action value, then calculates the frequency of the water pump 8 when the water flow of the primary side water circuit in the heat exchanger is L ' and converts the frequency into an analog electrical signal 81, outputs the analog electrical signal to the frequency converter, and simultaneously adjusts the frequency of the water pump 8 until the frequency of the water pump is equal to the frequency of the primary side of the frequency converter 8 according to the PID automatic adjustment result, and calculates the frequency of the water pump 8 when the water flow of the primary side water circuit in the heat exchanger is L ' and the frequency of the primary water pump 8 is equal to the frequency of the water pump 8.
When L 'is smaller than L ", the controller 5 obtains the current water flow passing through the variable-frequency water pump device in the water flow control device, the opening of the valve facing the heat exchanger on the bypass control valve connected with the variable-frequency water pump device in the current water flow control device, the water inlet temperature T2 of the current secondary side water circuit, the water inlet temperature T3 of the primary side water circuit in the current heat exchanger, and the water outlet temperature T4 of the primary side water circuit in the current heat exchanger, adjusts the PID parameters by a closed-loop transfer function relation and a disturbance complete compensation requirement in the heat exchange flow feedforward-temperature feedback composite control system, and combines an attenuation curve method and an empirical test method to determine the gain factor P value, an integral action value and a differential action value, respectively, then calculates the opening of the valve facing the heat exchanger 1 on the bypass control valve 9 when the water pump 8 operates at the lowest allowable frequency and the water flow rate of the primary side water circuit 3 in the heat exchanger 1 is L', correspondingly adjusts the valve opening of the bypass control valve 9 facing the heat exchanger 1 and adjusts the water pump 8 until the allowable frequency of the water pump 8 is equal to the allowable frequency of the primary side water circuit 3 in the heat exchanger 1 according to the PID automatic adjustment result.
The invention also provides a control method based on the liquid cooling heat exchange device, as shown in fig. 2, comprising the following steps:
s100, detecting and acquiring the water outlet temperature T1 of a secondary side water loop connected with a heat exchanger, comparing the T1 with a preset temperature T, and judging whether the T1 is equal to the preset temperature T;
s200, when T1 is not equal to the preset temperature, calculating the water flow L' of a primary side water loop in the heat exchanger when T1 reaches T;
s300, detecting a primary side water loop connected with the heat exchanger, obtaining water flow L of the primary side water loop in the heat exchanger, comparing L with L ', and adjusting a water flow control device which is arranged at a water inlet end of the primary side water loop and is positioned outside the heat exchanger according to a comparison result of L and L ', until the water flow of the primary side water loop in the heat exchanger is equal to L '.
The step S100 further includes:
s10, detecting and acquiring a water outlet temperature signal of a secondary side water loop, a water flow signal of a primary side water loop in a heat exchanger and an outdoor wet bulb temperature;
s11, setting the water outlet temperature of the secondary side water loop to be the preset temperature T according to the obtained water outlet temperature signal of the secondary side water loop, the water flow signal of the primary side water loop in the heat exchanger and the outdoor wet bulb temperature.
The step S300 specifically includes:
s30, when L is smaller than L ', calculating the water flow L' of a primary side water loop in the heat exchanger when the opening of a valve on the bypass control valve facing the heat exchanger is maximum and the frequency of the variable-frequency water pump device is the lowest allowable frequency, comparing L 'with L', and adjusting the water flow control device according to a comparison result;
and S31, when L 'is smaller than L, calculating the water flow L' of a primary side water loop in the heat exchanger when the opening of the valve on the bypass control valve facing the heat exchanger is maximum and the frequency of the variable-frequency water pump device is the lowest allowable frequency, comparing L 'with L', and adjusting the water flow control device according to the comparison result.
The step S30 specifically includes:
s301, when L ' is smaller than L ', acquiring the current water flow passing through a variable-frequency water pump device in the water flow control device, the current valve opening of a bypass control valve connected with the variable-frequency water pump device in the water flow control device and facing the heat exchanger, the current water inlet temperature of a secondary side water loop, the current water inlet temperature of a primary side water loop in the heat exchanger and the current water outlet temperature of a primary side water loop in the heat exchanger, calculating the frequency of the variable-frequency water pump device when the valve opening of the bypass control valve facing the heat exchanger is maximum and the water flow of the primary side water loop in the heat exchanger is L ', adjusting the valve opening of the bypass control valve facing the heat exchanger to be maximum, and correspondingly adjusting the variable-frequency water pump device;
s302, when L 'is smaller than L', acquiring the current water flow passing through a variable-frequency water pump device in the water flow control device, the current valve opening of a bypass control valve connected with the variable-frequency water pump device in the water flow control device and facing to the heat exchanger side, the current water inlet temperature of a secondary side water loop, the current water inlet temperature of a primary side water loop in the heat exchanger and the current water outlet temperature of a primary side water loop in the heat exchanger, calculating the valve opening of the bypass control valve and correspondingly adjusting the bypass control valve under the current water flow passing through the variable-frequency water pump device in the water flow control device.
The step S31 specifically includes:
s311, when L ' is smaller than L ', acquiring the current water flow passing through a variable-frequency water pump device in the water flow control device, the opening of a valve facing the heat exchanger side on a bypass control valve connected with the variable-frequency water pump device in the water flow control device, the water inlet temperature of a current secondary side water loop, the water inlet temperature of a primary side water loop in the current heat exchanger and the water outlet temperature of a primary side water loop in the current heat exchanger, calculating the frequency of the variable-frequency water pump device when the water flow of the primary side water loop in the heat exchanger is L ' on the premise of the opening of the valve facing the heat exchanger side on the bypass control valve connected with the variable-frequency water pump device in the water flow control device, and correspondingly adjusting the variable-frequency water pump device;
s312, when L ' is smaller than L ', acquiring the current water flow passing through a variable-frequency water pump device in the water flow control device, the current valve opening of a bypass control valve connected with the variable-frequency water pump device in the water flow control device, which is towards the heat exchanger side, the current water inlet temperature of a secondary side water loop, the current water inlet temperature of a primary side water loop in the heat exchanger and the current water outlet temperature of the primary side water loop in the heat exchanger, calculating the frequency of the variable-frequency water pump device to be the lowest allowable frequency, and when the water flow of the primary side water loop in the heat exchanger is L ', the valve opening of the bypass control valve, which is towards the heat exchanger side, adjusting the frequency of the variable-frequency water pump device to be the smallest allowable frequency, and correspondingly adjusting the valve opening of the bypass control valve, which is towards the heat exchanger side.
In summary, the liquid cooling heat exchange device and the control method thereof provided by the invention are characterized in that the primary side water loop is detected through the adjusting device, the water flow L of the primary side water loop in the heat exchanger and the water flow L 'of the primary side water loop in the heat exchanger are respectively obtained when the water outlet temperature of the secondary side water loop connected with the heat exchanger reaches a preset temperature, the water flow L' of the primary side water loop in the heat exchanger is compared with the water flow L ', the water flow of the primary side water loop flowing into the heat exchanger is adjusted through the bypass control valve under the temperature feedback adjustment effect according to the comparison result of the L and the L', and meanwhile, the water pump rotating speed is adjusted through the frequency converter, so that the water outlet temperature of the secondary side water loop is kept at the preset temperature, the influence of various interferences such as traffic and environmental changes on the controlled parameter is avoided, and the controlled temperature is stabilized on the set value, so that the liquid cooling system always keeps higher temperature control quality.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (8)
1. The liquid cooling heat exchange device comprises a heat exchanger and is characterized by further comprising a secondary side water loop for cooling external equipment, a primary side water loop for cooling the secondary side water loop and an adjusting device for adjusting the primary side water loop to enable the outlet water temperature of the secondary side water loop to reach a preset temperature; the primary side water loop and the secondary side water loop are respectively connected with two ends of the heat exchanger, and the primary side water loop and the secondary side water loop are both connected with the regulating device;
the regulating device comprises a power supply, a controller connected with the power supply, a water flow control device, a first flowmeter and a second flowmeter, wherein the first flowmeter is used for detecting the water flow of a primary side water loop in the heat exchanger; the water flow control device and the first flowmeter are arranged at the water inlet end of the primary side water loop and are positioned outside the heat exchanger; the second flowmeter is arranged at the water outlet end of the secondary side water loop and is positioned outside the heat exchanger; the water outlet end of the primary side water loop outside the heat exchanger is also connected with the water flow control device; a primary side temperature detection device is arranged on the primary side water loop; the secondary side water loop is provided with a secondary side temperature detection device; the water flow control device, the first flowmeter, the second flowmeter, the primary side temperature detection device and the secondary side temperature detection device are all connected with the controller; the water flow control device comprises a variable-frequency water pump device and a bypass control valve; the bypass control valve is positioned between the variable-frequency water pump device and the heat exchanger; the water outlet end of the primary side water loop outside the heat exchanger is connected with the bypass control valve;
the controller is used for acquiring the water outlet temperature T1 and the water inlet temperature T2 of the secondary side water loop through the secondary side temperature detection device, acquiring the water inlet temperature T3 and the water outlet temperature T4 of the primary side water loop through the primary side temperature detection device, detecting the water flow L of the primary side water loop in the heat exchanger through the first flowmeter, detecting the water flow Le of the secondary side water loop through the second flowmeter, and calculating L 'according to L (T4-T3) =le (T2-T1) and L being equal to the water flow L' of the primary side water loop in the heat exchanger when T1=preset temperature T; and (3) carrying out data comparison analysis on the L and the L ', and calculating the frequency of the variable-frequency water pump device and the opening of the valve of the bypass control valve facing the side of the heat exchanger when the water flow of the primary side water loop in the heat exchanger is L ' by adopting a PID setting method, and correspondingly adjusting the variable-frequency water pump device and the bypass control valve until the L and the L ' are equal.
2. The liquid cooling heat exchange device according to claim 1, wherein the variable frequency water pump device comprises a water pump and a frequency converter; the water pump is arranged at the water inlet end of the primary side water loop; one end of the frequency converter is connected with the controller, and the other end of the frequency converter is connected with the water pump.
3. The liquid cooled heat exchanger of claim 1 wherein the bypass control valve is a three-way valve.
4. A control method based on the liquid-cooled heat exchange device according to any one of claims 1 to 3, characterized by comprising the steps of:
A. detecting and acquiring the water outlet temperature T1 of a secondary side water loop currently connected with the heat exchanger, comparing the T1 with a preset temperature T, and judging whether the T1 is equal to the preset temperature T or not;
B. when T1 is not equal to the preset temperature T, calculating the water flow L' of a primary side water loop in the heat exchanger when T1 reaches T;
C. detecting a primary side water loop connected with a heat exchanger, acquiring water flow L of the primary side water loop in the heat exchanger, comparing L with L ', acquiring water outlet temperature T1 and water inlet temperature T2 of the secondary side water loop through the secondary side temperature detection device, acquiring water inlet temperature T3 and water outlet temperature T4 of the primary side water loop through the primary side temperature detection device, detecting water flow Le of the secondary side water loop through the second flowmeter, and calculating L ' according to L (T4-T3) =le (T2-T1), wherein L is equal to the water flow L ' of the primary side water loop in the heat exchanger when T1=T; and (3) carrying out data comparison analysis on the L and the L ', and calculating the frequency of the variable-frequency water pump device and the opening of the valve of the bypass control valve facing the side of the heat exchanger when the water flow of the primary side water loop in the heat exchanger is L ' by adopting a PID setting method, and correspondingly adjusting the variable-frequency water pump device and the bypass control valve until the L and the L ' are equal.
5. The control method according to claim 4, wherein the step a is preceded by:
a1, detecting and acquiring a water outlet temperature signal of a secondary side water loop, a water flow signal of the secondary side water loop, a water flow signal of a primary side water loop in a heat exchanger and an outdoor wet bulb temperature;
a2, setting the water outlet temperature of the secondary side water loop to be the preset temperature T according to the obtained water outlet temperature signal of the secondary side water loop, the water flow signal of the primary side water loop in the heat exchanger and the outdoor wet bulb temperature.
6. The control method according to claim 4, wherein the step C specifically includes:
when L is smaller than L ', calculating the water flow L' of a primary side water loop in the heat exchanger when the opening of a valve on the bypass control valve facing the heat exchanger is maximum and the frequency of the variable-frequency water pump device is the lowest allowable frequency, comparing L 'with L', and correspondingly adjusting the water flow control device according to a comparison result;
and C2, when L 'is smaller than L, calculating the water flow L' of a primary side water loop in the heat exchanger when the opening of the valve on the bypass control valve facing the heat exchanger is maximum and the frequency of the variable-frequency water pump device is the lowest allowable frequency, comparing L 'with L', and correspondingly adjusting the water flow control device according to the comparison result.
7. The control method according to claim 6, wherein the step C1 specifically includes:
when L ' is smaller than L ', acquiring the current water flow passing through a variable-frequency water pump device in the water flow control device, the current valve opening of a bypass control valve connected with the variable-frequency water pump device in the water flow control device towards the heat exchanger side, the current water inlet temperature of a secondary side water loop, the current water inlet temperature of a primary side water loop in the heat exchanger and the current water outlet temperature of the primary side water loop in the heat exchanger, calculating the frequency of the variable-frequency water pump device when the valve opening of the bypass control valve towards the heat exchanger side is maximum and the water flow of the primary side water loop in the heat exchanger is L ', adjusting the valve opening of the bypass control valve towards the heat exchanger side to be maximum, and correspondingly adjusting the variable-frequency water pump device;
and C12, when L 'is smaller than L', acquiring the current water flow passing through a variable-frequency water pump device in the water flow control device, the current valve opening of a bypass control valve connected with the variable-frequency water pump device in the water flow control device and facing to the heat exchanger side, the current water inlet temperature of a secondary side water loop, the current water inlet temperature of a primary side water loop in the heat exchanger and the current water outlet temperature of the primary side water loop in the heat exchanger, calculating the valve opening of the bypass control valve and correspondingly adjusting the bypass control valve under the current water flow passing through the variable-frequency water pump device in the water flow control device.
8. The control method according to claim 6, wherein the step C2 specifically includes:
c21 ' is smaller than L ', the current water flow passing through a variable-frequency water pump device in the water flow control device, the opening of a valve facing the heat exchanger side on a bypass control valve connected with the variable-frequency water pump device in the water flow control device, the water inlet temperature of a current secondary side water loop, the water inlet temperature of a primary side water loop in the current heat exchanger and the water outlet temperature of a primary side water loop in the current heat exchanger are obtained, the frequency of the variable-frequency water pump device is calculated on the premise that the opening of the valve facing the heat exchanger side on the bypass control valve connected with the variable-frequency water pump device in the water flow control device is the water flow of the primary side water loop in the heat exchanger is L ', and the variable-frequency water pump device is correspondingly regulated;
and C22, when L ' is smaller than L ', acquiring the current water flow passing through a variable-frequency water pump device in the water flow control device, the current valve opening of a bypass control valve connected with the variable-frequency water pump device in the water flow control device, which is towards the heat exchanger side, the current water inlet temperature of a secondary side water loop, the current water inlet temperature of a primary side water loop in the heat exchanger and the current water outlet temperature of the primary side water loop in the heat exchanger, calculating the frequency of the variable-frequency water pump device, and when the frequency of the variable-frequency water pump device is regulated to the lowest allowable frequency and the water flow of the primary side water loop in the heat exchanger is L ', regulating the frequency of the variable-frequency water pump device to the smallest allowable frequency by the valve opening of the bypass control valve, and correspondingly regulating the valve opening of the bypass control valve, which is towards the heat exchanger side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710670985.2A CN107466187B (en) | 2017-08-08 | 2017-08-08 | Liquid cooling heat exchange device and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710670985.2A CN107466187B (en) | 2017-08-08 | 2017-08-08 | Liquid cooling heat exchange device and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107466187A CN107466187A (en) | 2017-12-12 |
| CN107466187B true CN107466187B (en) | 2023-08-08 |
Family
ID=60548577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710670985.2A Active CN107466187B (en) | 2017-08-08 | 2017-08-08 | Liquid cooling heat exchange device and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107466187B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110190039A (en) * | 2018-11-30 | 2019-08-30 | 中航光电科技股份有限公司 | Water water heat exchange liquid cooling system and its liquid cooling source feed flow temperature, flow control methods |
| CN110081537B (en) * | 2019-03-20 | 2021-06-15 | 深圳市成大机电科技有限公司 | Control method for ice melting and cold supply |
| CN111642108B (en) * | 2020-05-30 | 2021-07-16 | 华为技术有限公司 | Liquid cooling module, control method thereof and liquid cooling system for data center |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1908536A (en) * | 2006-08-16 | 2007-02-07 | 广州市远正智能科技有限公司 | Cold volume governing system for regionally concentrated cold supply second-stage cold volume exchange station |
| JP2009231529A (en) * | 2008-03-24 | 2009-10-08 | Hitachi Plant Technologies Ltd | Cooling system for electronic device |
| CN104252187A (en) * | 2014-09-19 | 2014-12-31 | 广东申菱空调设备有限公司 | Control method for heat dissipation system of secondary water loop server cabinet |
| CN105020822A (en) * | 2015-07-31 | 2015-11-04 | 新智能源系统控制有限责任公司 | Variable pressure difference control system applicable to air conditioner first-stage pump system |
| CN106168404A (en) * | 2016-07-13 | 2016-11-30 | 昆山台佳机电有限公司 | The secondary pump air-conditioner water system flow-changing control method of temperature difference correction and device |
| CN106647987A (en) * | 2016-11-15 | 2017-05-10 | 曙光节能技术（北京）股份有限公司 | Cooling system |
| CN106686944A (en) * | 2016-12-01 | 2017-05-17 | 无锡市优利康电气有限公司 | Liquid cooling frequency converter heat dissipation system |
| CN106766365A (en) * | 2016-11-28 | 2017-05-31 | 广东美的暖通设备有限公司 | Frequency conversion air-cooled heat pump water chiller-heater system and its control method and air-conditioning |
| CN207252118U (en) * | 2017-08-08 | 2018-04-17 | 广东申菱环境系统股份有限公司 | A kind of liquid cooling heat-exchanger |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6458649B2 (en) * | 2015-06-01 | 2019-01-30 | 富士通株式会社 | COOLING DEVICE, COOLING METHOD, AND INFORMATION PROCESSING SYSTEM |
-
2017
- 2017-08-08 CN CN201710670985.2A patent/CN107466187B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1908536A (en) * | 2006-08-16 | 2007-02-07 | 广州市远正智能科技有限公司 | Cold volume governing system for regionally concentrated cold supply second-stage cold volume exchange station |
| JP2009231529A (en) * | 2008-03-24 | 2009-10-08 | Hitachi Plant Technologies Ltd | Cooling system for electronic device |
| CN104252187A (en) * | 2014-09-19 | 2014-12-31 | 广东申菱空调设备有限公司 | Control method for heat dissipation system of secondary water loop server cabinet |
| CN105020822A (en) * | 2015-07-31 | 2015-11-04 | 新智能源系统控制有限责任公司 | Variable pressure difference control system applicable to air conditioner first-stage pump system |
| CN106168404A (en) * | 2016-07-13 | 2016-11-30 | 昆山台佳机电有限公司 | The secondary pump air-conditioner water system flow-changing control method of temperature difference correction and device |
| CN106647987A (en) * | 2016-11-15 | 2017-05-10 | 曙光节能技术（北京）股份有限公司 | Cooling system |
| CN106766365A (en) * | 2016-11-28 | 2017-05-31 | 广东美的暖通设备有限公司 | Frequency conversion air-cooled heat pump water chiller-heater system and its control method and air-conditioning |
| CN106686944A (en) * | 2016-12-01 | 2017-05-17 | 无锡市优利康电气有限公司 | Liquid cooling frequency converter heat dissipation system |
| CN207252118U (en) * | 2017-08-08 | 2018-04-17 | 广东申菱环境系统股份有限公司 | A kind of liquid cooling heat-exchanger |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107466187A (en) | 2017-12-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107466187B (en) | Liquid cooling heat exchange device and control method thereof | |
| US10271457B2 (en) | Heat dissipation apparatus, heat dissipation control method, and controller | |
| US8755948B2 (en) | Controlling fluid coolant flow in cooling systems of computing devices | |
| CN106610052B (en) | Hydraulic balance adjusting method and system for isothermal-difference variable flow | |
| US20160291605A1 (en) | Method, and device for controlling the output of the air volume and memory medium | |
| EP2986097B1 (en) | Liquid cooling system and control method therefor | |
| CN105953602A (en) | Energy-saving control method and device used for cooling tower and air-conditioning system | |
| CN104822242A (en) | Liquid cooling equipment control system, method and apparatus | |
| CN109185972A (en) | Thermal substation circulating pump optimal regulation method | |
| CN110925854A (en) | Flow regulation method and system for improving hydraulic imbalance of secondary heat supply network | |
| CN111442438A (en) | System and control method for refrigerating machine room | |
| CN109028286A (en) | A kind of heat supply balance regulation system based on monitor supervision platform and smart valve | |
| CN110881262B (en) | Control method for cold source output capacity of liquid cooling system of data machine room | |
| CN111322885B (en) | Device and method for controlling louver of indirect cooling system | |
| CN107027269A (en) | Computer-room air conditioning system control method | |
| CN115823706A (en) | Primary pump self-adaptive variable pressure difference energy-saving control system and method | |
| CN114727563A (en) | Flow-control liquid cooling heat dissipation system and method thereof and liquid cooling cabinet | |
| CN207252118U (en) | A kind of liquid cooling heat-exchanger | |
| CN210370836U (en) | Automatic engine oil temperature adjusting device | |
| RU2014127665A (en) | COOLING WITH A CLOSED CIRCUIT OF THE PLASMA GUN TO INCREASE THE SERVICE LIFE OF THE HARDWARE | |
| CN111864518A (en) | Low-cost laser instrument cooling system | |
| CN206422723U (en) | Efficiency control device and Energy Saving System of Water Pump | |
| CN115853817B (en) | Video judging system for variable-frequency energy-saving safety protection of fan | |
| CN110332603A (en) | A kind of heat exchange station secondary side circulation pump variable flow regulation method and system | |
| CN212512040U (en) | Workshop cooling circulation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |