CN107664339B - Control method and device for cooling water pump of central air conditioner and central air conditioner - Google Patents
Control method and device for cooling water pump of central air conditioner and central air conditioner Download PDFInfo
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- CN107664339B CN107664339B CN201710994539.7A CN201710994539A CN107664339B CN 107664339 B CN107664339 B CN 107664339B CN 201710994539 A CN201710994539 A CN 201710994539A CN 107664339 B CN107664339 B CN 107664339B
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Abstract
The embodiment of the invention provides a control method and device for a cooling water pump of a central air conditioner and the central air conditioner, and belongs to the technical field of air conditioners. The central air conditioner comprises a cooling tower, and the method comprises the following steps: detecting the outdoor wet bulb temperature, the current cooling water return temperature of the cooling water pump and the current cooling water supply temperature; determining the ideal return water temperature of the cooling water according to the outdoor wet bulb temperature and the coefficient of the cooling tower; and controlling the working frequency of the cooling water pump according to the current cooling water return temperature, the current cooling water supply temperature, the supply and return water temperature difference preset value, the temperature deviation allowable value and the ideal cooling water return temperature. The invention can make the cooling water pump meet the heat release capacity limit of the cooling tower, and operate in the optimal energy-saving state aiming at the required heat release.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for controlling a cooling water pump of a central air conditioner and the central air conditioner.
Background
The central air-conditioning system mainly comprises three parts: the air conditioner comprises a refrigeration host, an air conditioning water system and an air conditioning air system.
The refrigeration host is the core of the whole system and provides refrigeration for the whole system. The principle of the general refrigeration main machine is that a compressor compresses steam with lower pressure into steam with higher pressure, so that the volume of the steam is reduced, and the pressure is increased. The compressor sucks working medium steam with lower pressure processed by the evaporator, the working medium steam is sent to the condenser after the pressure is increased, the working medium steam is condensed into liquid with higher pressure in the condenser, the liquid is throttled by the throttle valve and then is sent to the evaporator, the liquid is evaporated by absorbing heat in the evaporator to form steam with lower pressure, and then the steam is sent to the inlet of the compressor, so that the refrigeration cycle is completed.
The air conditioning water system comprises a refrigerating water system and a cooling water system. The chilled water system is used for conveying chilled water from the refrigeration main machine to a fan coil of a building room for heat exchange, and returning the chilled water subjected to heat exchange to the refrigeration main machine for refrigeration. The cooling water system mainly has the functions that heat at one end of chilled water is absorbed by the refrigeration main machine and is input into the cooling tower for cooling, and then the chilled water returns to the refrigeration main machine to absorb heat at one end of the chilled water.
The cooling water system in the air-conditioning water system comprises a cooling water loop and a cooling tower loop, wherein in the cooling water loop, water supply of a condenser is transmitted by a water pump, and heat exchange between cooling return water and a refrigerant is realized. In the cooling tower loop, cooling water from the condenser carries a large amount of heat, and exchanges heat with the surrounding environment in the cooling tower to realize cooling.
The inventor of the present application finds that the above solution of the prior art has the following disadvantages in the process of implementing the present invention: in a cooling water loop in the prior art, a cooling water pump and a cooling tower fan cannot run coordinately, generally, the cooling water pump runs under the maximum frequency to meet the heat dissipation requirement of a cooling tower and exceeds the limit of the heat dissipation capacity of the cooling tower, the water amount of the cooling tower is excessive, the efficiency is low, and the energy consumption is large.
Disclosure of Invention
The embodiment of the invention aims to provide a control method and a control device of a cooling water pump of a central air conditioner and the central air conditioner.
In order to achieve the above object, an embodiment of the present invention provides a method for controlling a cooling water pump of a central air conditioner including a cooling tower, the method including: detecting the outdoor wet bulb temperature, the current cooling water return temperature of the cooling water pump and the current cooling water supply temperature; determining the ideal return water temperature of the cooling water according to the outdoor wet bulb temperature and the coefficient of the cooling tower; and controlling the working frequency of the cooling water pump according to the current cooling water return temperature, the current cooling water supply temperature, the supply and return water temperature difference preset value, the temperature deviation allowable value and the ideal cooling water return temperature.
Preferably, the ideal cooling water return water temperature is calculated by the following formula: t is2＝(a+1)×T1+bWherein, T1Is the outdoor wet bulb temperature, a and b are the cooling tower coefficients, T2The ideal cooling water return water temperature is obtained.
Preferably, controlling the operating frequency of the cooling water pump according to the current cooling water return temperature, the current cooling water supply temperature, a supply and return water temperature difference preset value, a temperature deviation allowable value and the ideal cooling water return temperature includes: when the current cooling water return temperature is determined to be greater than the sum of the ideal cooling water return temperature and the temperature deviation allowable value, controlling the cooling water pump to operate at the maximum frequency value of the cooling water pump; when the current cooling water return temperature is determined to be smaller than the difference between the ideal cooling water return temperature and the temperature deviation allowable value, controlling the cooling water pump to operate at the minimum frequency value of the cooling water pump; and when the current cooling water return temperature is determined to be less than or equal to the sum of the ideal cooling water return temperature and the temperature deviation allowable value and is determined to be greater than or equal to the difference between the ideal cooling water return temperature and the temperature deviation allowable value, controlling the working frequency of the cooling water pump according to the current cooling water return temperature, the current cooling water supply temperature, the supply and return water temperature difference preset value and the temperature deviation allowable value.
Preferably, the controlling the working frequency of the cooling water pump according to the current cooling water return temperature, the current cooling water supply temperature, the supply and return water temperature difference preset value and the temperature deviation allowable value comprises: when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be larger than the sum of the preset water supply and return temperature difference value and the temperature deviation allowable value, increasing the frequency of the cooling water pump; when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be smaller than the difference between the water supply and return temperature difference preset value and the temperature deviation allowable value, reducing the frequency of the cooling water pump; and when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be less than or equal to the sum of the preset water supply and return temperature difference value and the allowable temperature deviation value and is determined to be greater than or equal to the difference between the preset water supply and return temperature difference value and the allowable temperature deviation value, controlling the frequency of the cooling water pump to be unchanged.
Preferably, the method further comprises: detecting the current cooling water return flow; and controlling the running number of the cooling water pumps according to the current cooling water return flow.
An embodiment of the present invention further provides a control device for a cooling water pump of a central air conditioner, where the central air conditioner includes a cooling tower, and the control device includes: the device comprises a detection unit, a processing unit and a control unit, wherein the detection unit is used for detecting the outdoor wet bulb temperature, the current cooling water return water temperature and the current cooling water supply water temperature of the cooling water pump; the processing unit is used for determining the ideal return water temperature of the cooling water according to the outdoor wet bulb temperature and the coefficient of the cooling tower; and the control unit is used for controlling the working frequency of the cooling water pump according to the current cooling water return temperature, the current cooling water supply temperature, a supply and return water temperature difference preset value, a temperature deviation allowable value and the ideal cooling water return temperature.
Preferably, the processing unit is further configured to calculate the ideal cooling water return water temperature by the following formula: t is2＝(a+1)×T1+ b, wherein, T1Is the outdoor wet bulb temperature, a and b are the cooling tower coefficients, T2The ideal cooling water return water temperature is obtained.
Preferably, the control unit is further configured to: when the current cooling water return temperature is determined to be greater than the sum of the ideal cooling water return temperature and the temperature deviation allowable value, controlling the cooling water pump to operate at the maximum frequency value of the cooling water pump; when the current cooling water return temperature is determined to be smaller than the difference between the ideal cooling water return temperature and the temperature deviation allowable value, controlling the cooling water pump to operate at the minimum frequency value of the cooling water pump; and when the current cooling water return temperature is determined to be less than or equal to the sum of the ideal cooling water return temperature and the temperature deviation allowable value and is determined to be greater than or equal to the difference between the ideal cooling water return temperature and the temperature deviation allowable value, controlling the working frequency of the cooling water pump according to the current cooling water return temperature, the current cooling water supply temperature, the supply and return water temperature difference preset value and the temperature deviation allowable value.
Preferably, in a case where it is determined that the current cooling-water return temperature is equal to or less than the sum of the ideal cooling-water return temperature and the temperature deviation allowance value, and equal to or more than the difference between the ideal cooling-water return temperature and the temperature deviation allowance value, the control unit is further configured to: when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be larger than the sum of the preset water supply and return temperature difference value and the temperature deviation allowable value, increasing the frequency of the cooling water pump; when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be smaller than the difference between the water supply and return temperature difference preset value and the temperature deviation allowable value, reducing the frequency of the cooling water pump; and when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be less than or equal to the sum of the preset water supply and return temperature difference value and the allowable temperature deviation value and is determined to be greater than or equal to the difference between the preset water supply and return temperature difference value and the allowable temperature deviation value, controlling the frequency of the cooling water pump to be unchanged.
Preferably, the detection unit is further configured to detect a return water flow of the current cooling water; the control unit is also used for controlling the running quantity of the cooling water pumps according to the current cooling water return flow.
The embodiment of the invention also provides a central air conditioner which comprises a cooling water pump, a cooling tower and the control device of the cooling water pump of the central air conditioner.
By adopting the technical scheme, the method and the device for controlling the cooling water pump of the central air conditioner and the central air conditioner provided by the invention comprise the following steps: detecting the outdoor wet bulb temperature, the current cooling water return temperature of the cooling water pump and the current cooling water supply temperature; determining the ideal return water temperature of the cooling water according to the outdoor wet bulb temperature and the coefficient of the cooling tower; and controlling the working frequency of the cooling water pump according to the current cooling water return temperature, the current cooling water supply temperature, the supply and return water temperature difference preset value, the temperature deviation allowable value and the ideal cooling water return temperature. The required target water temperature is determined according to the outdoor wet bulb temperature, the cooling water pump is enabled to operate according to the requirement, the cooling water pump meets the heat release capacity limitation of the cooling tower, and the cooling water pump operates in the optimal energy-saving state according to the required heat release quantity.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 is a flowchart illustrating a method for controlling a cooling water pump of a central air conditioner according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for controlling a cooling water pump of a central air conditioner according to another embodiment of the present invention;
fig. 3 is a flowchart of a method for controlling a cooling water pump of a central air conditioner according to another embodiment of the present invention;
fig. 4 is a flowchart of a method for controlling a cooling water pump of a central air conditioner according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a control device of a cooling water pump of a central air conditioner according to an embodiment of the present invention.
Description of the reference numerals
1 detection unit 2 processing unit
3 a control unit.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a flowchart illustrating a method for controlling a cooling water pump of a central air conditioner according to an embodiment of the present invention. As shown in fig. 1, the central air conditioner includes a cooling tower, and the method includes: detecting the outdoor wet bulb temperature, the current cooling water return water temperature and the current cooling water supply water temperature of the cooling water pump (step S11); determining an ideal cooling water return water temperature according to the outdoor wet bulb temperature and the coefficient of the cooling tower (step S12); and controlling the working frequency of the cooling water pump according to the current cooling water return temperature, the current cooling water supply temperature, the supply and return water temperature difference preset value, the temperature deviation allowable value and the ideal cooling water return temperature (step S13).
In the embodiment of the present invention, the device for controlling the operating frequency of the cooling water pump may be an inverter, and the operating frequency of the cooling water pump may be changed by changing the output frequency of the inverter.
The approach temperature of the cooling tower increases along with the reduction of the outdoor wet bulb temperature, and the approach temperature and the outdoor wet bulb temperature present a remarkable linear relation; that is, the approach temperature can be expressed as a function of the wet bulb temperature: the approach temperature of the cooling tower is a multiplied by the wet bulb temperature + b, wherein a <0, b >0, and a and b are determined by the model of the cooling tower and are mainly influenced by the filling weight loss coefficient of the cooling tower. The control of the cooling tower adopts a cooling tower approach temperature control method: the temperature of the outlet water (return water of cooling water) of the cooling tower is equal to the wet bulb temperature plus the approaching temperature of the cooling tower.
Therefore, in the embodiment of the present invention, the ideal cooling water return water temperature may be calculated by the following formula: t is2＝(a+1)×T1+ b, wherein, T1Is the outdoor wet bulb temperature, a and b are the cooling tower coefficients, T2The ideal cooling water return water temperature is obtained.
Through the formula, after the current outdoor wet bulb temperature is detected, the ideal return water temperature of the cooling water at the outdoor wet bulb temperature can be obtained. And then, the working frequency of the cooling water pump can be adjusted according to the detected current cooling water return temperature and current cooling water supply temperature, the preset water supply and return temperature difference preset value and temperature deviation allowable value and the calculated ideal cooling water return temperature. The allowable value of the temperature deviation can be a very small value, for example, 1.5 ℃, and the preset value of the temperature difference between the supplied water and the returned water can be optimized in real time according to the load condition of the system.
Fig. 2 is a flowchart of a method for controlling a cooling water pump of a central air conditioner according to another embodiment of the present invention. As shown in fig. 2, the method includes: detecting the outdoor wet bulb temperature, the current cooling water return water temperature and the current cooling water supply water temperature of the cooling water pump (step S21); determining an ideal cooling water return water temperature according to the outdoor wet bulb temperature and the coefficient of the cooling tower (step S22); judging whether the current cooling water return temperature is greater than the sum of the ideal cooling water return temperature and the temperature deviation allowable value (step S23); when the current cooling water return temperature is determined to be greater than the sum of the ideal cooling water return temperature and the temperature deviation allowable value, controlling the cooling water pump to operate at the maximum frequency of the cooling water pump (step S24); when it is determined that the current cooling water return temperature is not greater than the sum of the ideal cooling water return temperature and the temperature deviation allowable value, judging whether the current cooling water return temperature is less than the difference between the ideal cooling water return temperature and the temperature deviation allowable value (step S25); when the current cooling water return temperature is determined to be smaller than the difference between the ideal cooling water return temperature and the temperature deviation allowable value, controlling the cooling water pump to operate at the minimum frequency value of the cooling water pump (step S26); and when the current cooling water return temperature is determined to be less than or equal to the sum of the ideal cooling water return temperature and the temperature deviation allowable value and is determined to be greater than or equal to the difference between the ideal cooling water return temperature and the temperature deviation allowable value, controlling the working frequency of the cooling water pump according to the current cooling water return temperature, the current cooling water supply temperature, the supply and return water temperature difference preset value and the temperature deviation allowable value (step S27).
The embodiment provides a method for adjusting the working frequency of a cooling water pump. In this embodiment, the detected current cooling water return water temperature is mainly compared with the following two data: the first is the sum of the return water temperature of the ideal cooling water and the allowable value of the temperature deviation; the second is the difference between the return water temperature of the ideal cooling water and the allowable value of the temperature deviation. After comparison, three conditions can occur, and when the temperature is greater than the sum of the ideal return water temperature of the cooling water and the allowable value of the temperature deviation, the cooling water pump is controlled to operate at the maximum frequency value of the cooling water pump; when the difference is smaller than the difference between the ideal cooling water return temperature and the temperature deviation allowable value, controlling the cooling water pump to operate at the minimum frequency value of the cooling water pump; when the difference is less than or equal to the sum of the ideal cooling water return water temperature and the temperature deviation allowable value and is more than or equal to the difference between the ideal cooling water return water temperature and the temperature deviation allowable value, the working frequency of the cooling water pump can be linearly changed along with the cooling water return water temperature.
Fig. 3 is a flowchart of a method for controlling a cooling water pump of a central air conditioner according to another embodiment of the present invention. As shown in fig. 3, when it is determined that the current cooling-water return temperature is equal to or less than the sum of the ideal cooling-water return temperature and the allowable temperature deviation value, and equal to or more than the difference between the ideal cooling-water return temperature and the allowable temperature deviation value, the method further includes: judging whether the difference between the current cooling water return temperature and the current cooling water supply temperature is greater than the sum of the water supply and return temperature difference preset value and the temperature deviation allowable value (step S31); when it is determined that the difference between the current cooling water return temperature and the current cooling water supply temperature is greater than the sum of the supply-return water temperature difference predetermined value and the temperature deviation allowable value, increasing the frequency of the cooling water pump (step S32); when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be not greater than the sum of the supply and return water temperature difference preset value and the temperature deviation allowable value, judging whether the difference between the current cooling water return temperature and the current cooling water supply temperature is smaller than the difference between the supply and return water temperature difference preset value and the temperature deviation allowable value (step S33); reducing the frequency of the cooling water pump when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be smaller than the difference between the water supply and return temperature difference preset value and the temperature deviation allowable value (step S34); and when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be less than or equal to the sum of the preset water supply and return temperature difference value and the allowable temperature deviation value and is determined to be greater than or equal to the difference between the preset water supply and return temperature difference value and the allowable temperature deviation value, controlling the frequency of the cooling water pump to be unchanged (step S35).
The present embodiment provides the manner mentioned in the above embodiment, in which the operating frequency of the cooling water pump is adjusted when the current cooling water return temperature is equal to or less than the sum of the ideal cooling water return temperature and the allowable value of the temperature deviation, and is equal to or more than the difference between the ideal cooling water return temperature and the allowable value of the temperature deviation.
In this embodiment, the difference between the current cooling water return temperature and the current cooling water supply temperature is mainly compared with the following two data: the first is the sum of the preset temperature difference value of the supply water and the return water and the allowable temperature deviation value; the second is the difference between the preset temperature difference value of the supplied and returned water and the allowable temperature deviation value. When the temperature difference is larger than the sum of the preset value of the temperature difference of the supplied and returned water and the allowable value of the temperature deviation, increasing the frequency of the cooling water pump; when the difference is smaller than the difference between the preset value of the temperature difference of the supplied and returned water and the allowable value of the temperature deviation, reducing the frequency of the cooling water pump; and when the difference is less than or equal to the sum of the preset water supply and return temperature difference value and the allowable temperature deviation value and is greater than or equal to the difference between the preset water supply and return temperature difference value and the allowable temperature deviation value, controlling the frequency of the cooling water pump to be unchanged and continuously monitoring.
Fig. 4 is a flowchart of a method for controlling a cooling water pump of a central air conditioner according to another embodiment of the present invention. As shown in fig. 4, the method further includes: detecting the current cooling water return flow (step S41); and controlling the operation quantity of the cooling water pumps according to the current cooling water return flow (step S42).
In the present embodiment, a scheme of controlling the number of cooling water pumps is provided. The running number of the cooling water pumps is related to the current return flow of the cooling water. The larger the return flow of the cooling water is, the more the running quantity of the cooling water pumps is, the smaller the return flow of the cooling water is, and the less the running quantity of the cooling water pumps is. The scheme of controlling the number of the cooling water pumps of the present embodiment may be used together with the scheme of controlling the operating frequency of the cooling water pumps of the above-described embodiments.
Fig. 5 is a schematic structural diagram of a control device of a cooling water pump of a central air conditioner according to an embodiment of the present invention. As shown in fig. 5, the central air conditioner includes a cooling tower, and the apparatus includes: the device comprises a detection unit 1, a processing unit 2 and a control unit 3, wherein the detection unit 1 is used for detecting the outdoor wet bulb temperature, the current cooling water return water temperature and the current cooling water supply water temperature of the cooling water pump; the processing unit 2 is used for determining an ideal cooling water return water temperature according to the outdoor wet bulb temperature and the coefficient of the cooling tower; and the control unit 3 is used for controlling the working frequency of the cooling water pump according to the current cooling water return temperature, the current cooling water supply temperature, a preset water supply and return temperature difference value, a temperature deviation allowable value and the ideal cooling water return temperature.
Preferably, the processing unit 2 is further configured to calculate the ideal cooling water return water temperature by the following formula: t is2＝(a+1)×T1+ b, wherein, T1Is the outdoor wet bulb temperature, a and b are the cooling tower coefficients, T2The ideal cooling water return water temperature is obtained.
Preferably, the control unit 3 is further configured to: when the current cooling water return temperature is determined to be greater than the sum of the ideal cooling water return temperature and the temperature deviation allowable value, controlling the cooling water pump to operate at the maximum frequency value of the cooling water pump; when the current cooling water return temperature is determined to be smaller than the difference between the ideal cooling water return temperature and the temperature deviation allowable value, controlling the cooling water pump to operate at the minimum frequency value of the cooling water pump; and when the current cooling water return temperature is determined to be less than or equal to the sum of the ideal cooling water return temperature and the temperature deviation allowable value and is determined to be greater than or equal to the difference between the ideal cooling water return temperature and the temperature deviation allowable value, controlling the working frequency of the cooling water pump according to the current cooling water return temperature, the current cooling water supply temperature, the supply and return water temperature difference preset value and the temperature deviation allowable value.
Preferably, in the case where it is determined that the current cooling-water return temperature is equal to or less than the sum of the ideal cooling-water return temperature and the temperature deviation allowable value, and equal to or more than the difference between the ideal cooling-water return temperature and the temperature deviation allowable value, the control unit 3 is further configured to: when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be larger than the sum of the preset water supply and return temperature difference value and the temperature deviation allowable value, increasing the frequency of the cooling water pump; when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be smaller than the difference between the water supply and return temperature difference preset value and the temperature deviation allowable value, reducing the frequency of the cooling water pump; and when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be less than or equal to the sum of the preset water supply and return temperature difference value and the allowable temperature deviation value and is determined to be greater than or equal to the difference between the preset water supply and return temperature difference value and the allowable temperature deviation value, controlling the frequency of the cooling water pump to be unchanged.
Preferably, the detection unit 1 is further configured to detect a return water flow of the current cooling water; the control unit 3 is further configured to control the number of running cooling water pumps according to the current cooling water return flow.
The embodiment of the invention also provides a central air conditioner which comprises a cooling water pump, a cooling tower and the control device of the cooling water pump of the central air conditioner.
By adopting the technical scheme, the control method and the control device for the cooling water pump of the central air conditioner and the central air conditioner provided by the invention can be used for determining the required target water temperature according to the outdoor wet bulb temperature, enabling the cooling water pump to operate according to the requirement, enabling the cooling water pump to meet the heat release capacity limitation of the cooling tower and operating in the optimal energy-saving state aiming at the required heat release quantity.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in 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 or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (9)
1. A method for controlling a cooling water pump of a central air conditioner, the central air conditioner including a cooling tower, the method comprising:
detecting the outdoor wet bulb temperature, the current cooling water return temperature of the cooling water pump and the current cooling water supply temperature;
determining the ideal return water temperature of the cooling water according to the outdoor wet bulb temperature and the coefficient of the cooling tower;
when the current cooling water return temperature is determined to be greater than the sum of the ideal cooling water return temperature and the temperature deviation allowable value, controlling the cooling water pump to operate at the maximum frequency value of the cooling water pump;
when the current cooling water return temperature is determined to be smaller than the difference between the ideal cooling water return temperature and the temperature deviation allowable value, controlling the cooling water pump to operate at the minimum frequency value of the cooling water pump;
and when the current cooling water return temperature is determined to be less than or equal to the sum of the ideal cooling water return temperature and the temperature deviation allowable value and is determined to be greater than or equal to the difference between the ideal cooling water return temperature and the temperature deviation allowable value, controlling the working frequency of the cooling water pump according to the current cooling water return temperature, the current cooling water supply temperature, the supply and return water temperature difference preset value and the temperature deviation allowable value.
2. The control method of a cooling water pump of a central air conditioner according to claim 1, wherein the desired cooling water return water temperature is calculated by the following formula:
T2＝(a+1)×T1+ b, wherein, T1Is the outdoor wet bulb temperature, a and b are the cooling tower coefficients, T2The ideal cooling water return water temperature is obtained.
3. The method for controlling a cooling water pump of a central air conditioner according to claim 1, wherein controlling the operating frequency of the cooling water pump according to the current cooling water return water temperature, the current cooling water supply water temperature, the supply and return water temperature difference predetermined value, and the temperature deviation allowable value comprises:
when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be larger than the sum of the preset water supply and return temperature difference value and the temperature deviation allowable value, increasing the frequency of the cooling water pump;
when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be smaller than the difference between the water supply and return temperature difference preset value and the temperature deviation allowable value, reducing the frequency of the cooling water pump;
and when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be less than or equal to the sum of the preset water supply and return temperature difference value and the allowable temperature deviation value and is determined to be greater than or equal to the difference between the preset water supply and return temperature difference value and the allowable temperature deviation value, controlling the frequency of the cooling water pump to be unchanged.
4. The method for controlling a cooling water pump of a central air conditioner according to claim 1, further comprising:
detecting the current cooling water return flow;
and controlling the running number of the cooling water pumps according to the current cooling water return flow.
5. A control device of a cooling water pump of a central air conditioner, characterized in that the central air conditioner includes a cooling tower, the device comprising:
a detection unit, a processing unit and a control unit, wherein,
the detection unit is used for detecting the outdoor wet bulb temperature, the current cooling water return temperature of the cooling water pump and the current cooling water supply temperature;
the processing unit is used for determining the ideal return water temperature of the cooling water according to the outdoor wet bulb temperature and the coefficient of the cooling tower;
the control unit is used for:
when the current cooling water return temperature is determined to be greater than the sum of the ideal cooling water return temperature and the temperature deviation allowable value, controlling the cooling water pump to operate at the maximum frequency value of the cooling water pump;
when the current cooling water return temperature is determined to be smaller than the difference between the ideal cooling water return temperature and the temperature deviation allowable value, controlling the cooling water pump to operate at the minimum frequency value of the cooling water pump;
and when the current cooling water return temperature is determined to be less than or equal to the sum of the ideal cooling water return temperature and the temperature deviation allowable value and is determined to be greater than or equal to the difference between the ideal cooling water return temperature and the temperature deviation allowable value, controlling the working frequency of the cooling water pump according to the current cooling water return temperature, the current cooling water supply temperature, the supply and return water temperature difference preset value and the temperature deviation allowable value. .
6. The control device of the cooling water pump of the central air conditioner according to claim 5, wherein the processing unit is further configured to calculate the ideal cooling water return temperature by the following formula:
T2＝(a+1)×T1+ b, where T1 is the outdoor wet bulb temperature, a and b are the cooling tower coefficients, T2The ideal cooling water return water temperature is obtained.
7. The control device of the cooling water pump of the central air conditioner according to claim 5, wherein in the case where it is determined that the current cooling water return temperature is equal to or less than the sum of the ideal cooling water return temperature and the temperature deviation allowance value, and is equal to or greater than the difference between the ideal cooling water return temperature and the temperature deviation allowance value, the control unit is further configured to:
when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be larger than the sum of the preset water supply and return temperature difference value and the temperature deviation allowable value, increasing the frequency of the cooling water pump;
when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be smaller than the difference between the water supply and return temperature difference preset value and the temperature deviation allowable value, reducing the frequency of the cooling water pump;
and when the difference between the current cooling water return temperature and the current cooling water supply temperature is determined to be less than or equal to the sum of the preset water supply and return temperature difference value and the allowable temperature deviation value and is determined to be greater than or equal to the difference between the preset water supply and return temperature difference value and the allowable temperature deviation value, controlling the frequency of the cooling water pump to be unchanged.
8. The control device of the cooling water pump of the central air conditioner according to claim 5,
the detection unit is also used for detecting the current cooling water return flow;
the control unit is also used for controlling the running quantity of the cooling water pumps according to the current cooling water return flow.
9. A central air conditioner, characterized in that the central air conditioner comprises a cooling water pump, a cooling tower and a control device of the cooling water pump of the central air conditioner as claimed in any one of claims 5 to 8.
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| CN109945394B (en) * | 2019-01-22 | 2020-04-07 | 中山大学 | Accurate diagnosis method for small temperature difference syndrome of chilled water system of central air conditioner |
| CN110360868B (en) * | 2019-07-17 | 2020-06-26 | 珠海格力电器股份有限公司 | Cooling tower, method and device for adjusting upper limit frequency of variable frequency fan of cooling tower and air conditioning unit |
| CN112432307B (en) * | 2020-11-17 | 2021-11-02 | 珠海格力电器股份有限公司 | Water pump evaluation method and device, air conditioning system, storage medium and electronic equipment |
| CN112665233A (en) * | 2020-12-10 | 2021-04-16 | 珠海格力电器股份有限公司 | Control method and device for chilled water secondary pump, controller and water pump system |
| CN112665132B (en) * | 2020-12-24 | 2021-11-23 | 珠海格力电器股份有限公司 | Air conditioning system, energy-saving control method and device for cooling side of air conditioning system and controller |
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| KR20130118660A (en) * | 2012-04-20 | 2013-10-30 | 에스케이텔레콤 주식회사 | Device and method for controlling variable speed pumping of cooling water in network operating center building energy management system |
| CN104534628A (en) * | 2015-01-26 | 2015-04-22 | 珠海格力电器股份有限公司 | Control method and system for variable-frequency cooling water pump |
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Effective date of registration: 20210302 Address after: 200080 Room C, 14th floor, 309 Tanggu Road, Hongkou District, Shanghai Patentee after: Shanghai Meikong Intelligent Building Co.,Ltd. Patentee after: GD MIDEA HEATING & VENTILATING EQUIPMENT Co.,Ltd. Address before: 528311 Penglai Road Industrial Avenue, Beijiao Town, Shunde District, Foshan City, Guangdong Province Patentee before: GD MIDEA HEATING & VENTILATING EQUIPMENT Co.,Ltd. Patentee before: MIDEA GROUP Co.,Ltd. |