CN112393345B - Water pump frequency control method and device, evaporative cooler and air conditioning system - Google Patents
Water pump frequency control method and device, evaporative cooler and air conditioning system Download PDFInfo
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- CN112393345B CN112393345B CN202011376279.5A CN202011376279A CN112393345B CN 112393345 B CN112393345 B CN 112393345B CN 202011376279 A CN202011376279 A CN 202011376279A CN 112393345 B CN112393345 B CN 112393345B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The application relates to a water pump frequency control method, a water pump frequency control device, an evaporative cooler and an air conditioning system, wherein the water pump frequency control method comprises the steps of calculating the temperature difference of inlet water and outlet water of a heat exchange tube; when the temperature difference of inlet and outlet water of the heat exchange tube exceeds a first preset temperature difference range, the frequency of the cooling water pump is adjusted according to a first experimental formula so that the frequency of the water pump reaches a preset target range. The problem that the difference in temperature of inlet and outlet water in the heat exchange pipe can not meet the requirement and the water temperature fluctuation is large due to the fact that the frequency of the cooling water pump is not matched is solved, the operation stability and the economical efficiency of the system are improved, and the popularization of the evaporative cooler is facilitated.
Description
Technical Field
The application belongs to the technical field of air conditioners, and particularly relates to a water pump frequency control method and device, an evaporative cooler and an air conditioning system.
Background
With the continuous rise of air conditioning equipment, the air conditioning equipment is gradually perfected, for example, the traditional cooling tower has the problems of difficult site selection, high energy consumption and the like, so that the evaporative condenser is produced at the same time. The evaporative condenser has the advantages of high reliability, low failure rate, energy conservation and the like, but the existing evaporative condenser does not effectively control the flow of a water pump, so that the evaporative condenser has the defects of large noise, uneven water-gas ratio, large energy consumption and the like, and the problem of poor system operation stability caused by overhigh or too low temperature difference of inlet water and outlet water of a heat exchange pipe is caused, so that the popularization and the application of the evaporative cooler are hindered.
Disclosure of Invention
In order to overcome the defects that the existing evaporative condenser is large in noise, uneven in water-gas ratio and large in energy consumption due to the fact that the flow of a water pump is not effectively controlled, and the problem that the popularization and application of an evaporative cooler are hindered due to the fact that the temperature difference between inlet water and outlet water of a heat exchange tube is too high or too low is solved, the water pump frequency control method and device, the evaporative cooler and the air conditioning system are provided.
In a first aspect, the present application provides a water pump frequency control method, including:
calculating the temperature difference of inlet and outlet water of the heat exchange tube;
when the temperature difference of inlet and outlet water of the heat exchange tube exceeds a first preset temperature difference range, the frequency of the cooling water pump is adjusted according to a first experimental formula so that the frequency of the water pump reaches a preset target range.
Further, the preset target range includes:
the temperature difference of inlet and outlet water of the heat exchange tube is in a first preset temperature difference range,
or the like, or, alternatively,
the temperature difference of the inlet water and the outlet water of the heat exchange pipe is in a first preset temperature difference range, and the temperature difference of the evaporative cooler filler outlet and the evaporative cooling air outlet wet bulb is in a second preset temperature difference range.
Further, the method also comprises the following steps:
when the temperature difference of the inlet water and the outlet water of the heat exchange pipe meets a first preset temperature difference range, judging whether the temperature difference between a filler outlet of the evaporative cooler and a wet bulb of an evaporative cooling air outlet meets a second preset temperature difference range;
and if so, judging that the frequency of the water pump reaches a preset target range.
Further, the method also comprises the following steps:
and when the temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet wet bulb exceeds a second preset temperature difference range, adjusting the frequency of the spray water pump according to a second empirical formula so as to enable the frequency of the water pump to reach a preset target range.
Further, the first preset temperature difference range includes a first lower limit value and a first upper limit value, and the adjusting the frequency of the cooling water pump according to the first experimental formula so that the frequency of the water pump reaches a preset target range includes:
when the temperature difference of the inlet water and the outlet water of the heat exchange tube is larger than or equal to a first upper limit value, adjusting the frequency of a cooling water pump according to a first experimental formula so as to enable the temperature difference of the inlet water and the outlet water of the heat exchange tube to meet a preset target range;
the first empirical formula is: the cooling water pump frequency is equal to the initial frequency value + empirical factor (first upper limit value-first lower limit value)/2.
Further, the adjusting the frequency of the cooling water pump according to the first empirical formula to make the frequency of the water pump reach a preset target range further includes:
when the temperature difference of the inlet water and the outlet water of the heat exchange tube is smaller than or equal to a first lower limit value, adjusting the frequency of a cooling water pump according to a first experimental formula so as to enable the temperature difference of the inlet water and the outlet water of the heat exchange tube to meet a preset target range;
the first empirical formula is: the cooling water pump frequency is the initial frequency-empirical factor (first upper limit value-first lower limit value)/2.
Further, the second preset temperature difference range includes a second lower limit value and a second upper limit value, and the adjusting the frequency of the spray water pump according to a second empirical formula so that the frequency of the spray water pump reaches a preset target range includes:
when the temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet wet bulb is smaller than or equal to a second lower limit value, adjusting the frequency of the spray water pump according to a second empirical formula so that the temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet wet bulb meets a preset target range;
the second empirical formula is: the frequency of the spray water pump is equal to the initial value of the frequency-an empirical coefficient (a second upper limit value-a second lower limit value)/2.
Further, the adjusting the frequency of the spray water pump according to the second empirical formula so that the frequency of the spray water pump reaches a preset target range further includes:
when the temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet wet bulb is greater than or equal to a second lower limit value, adjusting the frequency of the spray water pump according to a second empirical formula so that the temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet wet bulb meets a preset target range;
the second empirical formula is: the frequency of the spray water pump is equal to the initial frequency value plus an empirical coefficient (a second upper limit value-a second lower limit value)/2.
Further, the empirical coefficient is valued according to a preset rule.
Further, the preset rule includes:
when the difference value between the temperature difference and the upper limit value or the lower limit value is in a first value range, the empirical coefficient is a first coefficient value;
when the difference value between the temperature difference and the upper limit value or the lower limit value is in a second value range, the empirical coefficient is a second coefficient value;
and when the difference value between the temperature difference and the upper limit value or the lower limit value is in a third value range, the empirical coefficient is a third coefficient value.
Further, the first value range is greater than or equal to 0 and less than or equal to 2; the first coefficient value is 0.9.
Further, the second value range is greater than 2 and less than or equal to 4; the second coefficient value is 1.1.
Further, the third value range is greater than 4 and less than or equal to 6; the third coefficient value is 1.3.
In a second aspect, the present application provides a water pump frequency control apparatus, comprising:
the calculation module is used for calculating the temperature difference of inlet and outlet water of the heat exchange tube;
and the first adjusting module is used for adjusting the frequency of the cooling water pump according to a first experimental formula so that the frequency of the water pump reaches a preset target range when the temperature difference of inlet and outlet water of the heat exchange tube exceeds a first preset temperature difference range.
In a third aspect, the present application provides an evaporative cooler comprising:
a cooling water pump and a controller, wherein the controller comprises a water pump frequency control device according to the second aspect;
the water inlet temperature sensor is arranged at the inlet of the heat exchange tube, and the water outlet temperature sensor is arranged at the outlet of the heat exchange tube;
the controller calculates the water inlet and outlet temperature difference of the heat exchange tube according to the temperature parameters obtained by the water inlet temperature sensor and the water outlet temperature sensor at the outlet, and when the water inlet and outlet temperature difference of the heat exchange tube exceeds a first preset temperature difference range, the frequency of the cooling water pump is adjusted according to a first experimental formula so that the frequency of the water pump reaches a preset target range.
Further, the method also comprises the following steps:
the spray pump, the wet bulb temperature sensor arranged at the air outlet and the wet bulb temperature sensor arranged at the filler outlet are arranged on the filter;
the controller is further used for calculating the wet bulb temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet according to the temperature parameters obtained by the wet bulb temperature sensor and the filler outlet wet bulb temperature sensor, and when the wet bulb temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet exceeds two preset temperature difference ranges, the frequency of the spray water pump is adjusted according to a second empirical formula so that the frequency of the spray water pump reaches a preset target range.
In a fourth aspect, the present application provides an air conditioning system comprising:
an evaporative cooler as claimed in the third aspect.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
according to the water pump frequency control method, the water pump frequency control device, the evaporative cooler and the air conditioning system, the water pump frequency control method comprises the step of calculating the temperature difference of water inlet and outlet of the heat exchange tube, when the temperature difference of the water inlet and outlet of the heat exchange tube exceeds a first preset temperature difference range, the cooling water pump frequency is adjusted according to a first experimental formula so that the water pump frequency reaches a preset target range, the problems that the temperature difference of the water inlet and outlet of the heat exchange tube cannot meet the requirement due to mismatching of the cooling water pump frequency and the water temperature fluctuation is large are solved, the system operation stability and the economical efficiency are improved, and the popularization of the evaporative cooler is facilitated.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a flowchart of a water pump frequency control method according to an embodiment of the present disclosure.
Fig. 2 is a flowchart of a water pump frequency control method according to another embodiment of the present disclosure.
Fig. 3 is a flowchart of a water pump frequency control method according to another embodiment of the present disclosure.
Fig. 4 is a functional structure diagram of a water pump frequency control device according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of an evaporative cooler according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a flowchart of a water pump frequency control method according to an embodiment of the present application, and as shown in fig. 1, the water pump frequency control method includes:
s11: calculating the temperature difference of inlet and outlet water of the heat exchange tube;
s12: when the temperature difference of inlet and outlet water of the heat exchange tube exceeds a first preset temperature difference range, the frequency of the cooling water pump is adjusted according to a first experimental formula so that the frequency of the water pump reaches a preset target range.
The evaporative condenser does not effectively control the flow of the water pump, so that the evaporative condenser has the defects of high noise, uneven water-gas ratio, high energy consumption and the like, the problem of poor system operation stability caused by too high or too low temperature difference of inlet water and outlet water of the heat exchange tube occurs, and the popularization and application of the evaporative cooler are hindered.
In this embodiment, through calculating the business turn over water difference in temperature of heat exchange tube, when the business turn over water difference in temperature of heat exchange tube surpassed first preset difference in temperature scope, adjust the cooling water pump frequency so that the water pump frequency reaches and predetermines the target range according to first experimental formula, solved the unmatched problem that leads to the business turn over water difference in heat exchange tube not to reach the requirement, the temperature fluctuation is big of cooling water pump frequency, improve system operation stability and economic nature, be favorable to the popularization of evaporative cooler.
The preset target range includes that the temperature difference of water inlet and outlet of the heat exchange tube is within a first preset temperature difference range, or the temperature difference of water inlet and outlet of the heat exchange tube is within a first preset temperature difference range, and the temperature difference of a filler outlet of an evaporative cooler and a wet bulb of an evaporative cooling air outlet is within a second preset temperature difference range, and when the preset target range is that the temperature difference of the filler outlet of the evaporative cooler and the wet bulb of the evaporative cooling air outlet is within the second preset temperature difference range, an embodiment of the application provides another water pump frequency control method, as shown in a flow chart shown in fig. 2, and the preset target range includes that the water pump frequency control method comprises the following steps:
s21: when the temperature difference of inlet and outlet water of the heat exchange tube meets a first preset temperature difference range, judging whether the temperature difference between a filler outlet of the evaporative cooler and a wet bulb of an evaporative cooling air outlet meets a second preset temperature difference range;
s22: and if so, judging that the frequency of the water pump reaches a preset target range.
S23: and when the temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet wet bulb exceeds a second preset temperature difference range, adjusting the frequency of the spray water pump according to a second empirical formula so as to enable the frequency of the water pump to reach a preset target range.
In the embodiment, when the temperature difference between the filler outlet of the evaporative cooler and the wet bulb of the evaporative cooling air outlet exceeds a second preset temperature difference range, the frequency of the spray water pump is adjusted according to a second empirical formula so that the frequency of the spray water pump reaches a preset target range, and the frequency of the spray water pump is adjusted according to the temperature difference between the filler outlet of the evaporative cooler and the wet bulb of the evaporative cooling air outlet on the basis of adjusting the water pump frequency of the evaporative cooler according to the temperature difference between the inlet and the outlet of the heat exchange tube, so that the energy change process in the evaporative cooler can be fully reflected, and the running stability and the economical efficiency of the system are improved.
Fig. 3 is a flowchart of a water pump frequency control method according to an embodiment of the present application, and as shown in fig. 3, the water pump frequency control method includes:
s31: judging whether the temperature difference delta T1 between the inlet and the outlet of the heat exchange tube meets the following conditions: a is less than or equal to delta T1 and less than or equal to B, if yes, S32 is executed, and otherwise, S33 is executed;
the first preset temperature difference range comprises a first lower limit value A and a first upper limit value B;
s32: judging whether the temperature difference between the evaporation cold filler outlet and the evaporation cold outlet wet bulb meets the condition that delta T2 is not less than C and is not more than D, if so, executing S36, and otherwise, executing S34;
the second preset temperature difference range comprises a second lower limit value C and a second upper limit value D;
s33: judging whether the delta T1 is greater than or equal to B or the delta T1 is less than or equal to A, and calculating the frequency value of the cooling water pump according to a first experimental formula;
adjusting the frequency of the cooling water pump according to a first experimental formula so that the frequency of the water pump reaches a preset target range, comprising:
when the delta T1 is larger than or equal to B, the frequency of the cooling water pump 3 is adjusted according to the formula M0+ alpha (B-A)/2, and the generated effect is that the frequency of the cooling water pump is increased to a preset target range;
when the delta T1 is less than or equal to A, the frequency is adjusted according to the formula M0-alpha (B-A)/2, and the effect is to reduce the frequency of the cooling water pump to a preset target range.
Wherein M is the frequency of the cooling water pump, M0 is the initial value of the frequency, and alpha is an empirical coefficient.
S34: and D, judging whether the delta T2 is larger than or equal to D or the delta T2 is smaller than or equal to C, and calculating the frequency value of the spray water pump according to a second empirical formula.
When the delta T2 is less than or equal to C, the frequency of the spray water pump of the evaporative cooler is adjusted according to the formula P0-alpha (B-A)/2, and the effect is to reduce the frequency of the spray water pump to a preset target range.
Wherein, P is the frequency of the cooling water pump, P0 is the initial value of the frequency, and alpha is the empirical coefficient.
When the delta T2 is larger than or equal to D, the spray water pump frequency of the evaporative cooler is adjusted according to the formula P0+ alpha (B-A)/2, and the spray water pump frequency is increased to a preset target range.
S35: after the frequency adjustment of the spray water pump of the evaporative cooler is finished through the wet bulb temperature difference, whether the temperature difference of inlet and outlet water in the pipe meets A which is not less than T and not more than B is judged again, and if not, S32 is executed; if yes, go to S36;
s36: the control is ended.
In some embodiments, the empirical coefficient α is evaluated according to a preset rule.
The preset rules include:
when the difference value between the temperature difference and the upper limit value or the lower limit value is in a first value range, the empirical coefficient is a first coefficient value;
when the difference value between the temperature difference and the upper limit value or the lower limit value is in a second value range, the empirical coefficient is a second coefficient value;
and when the difference value between the temperature difference and the upper limit value or the lower limit value is in a third value range, the empirical coefficient is a third coefficient value.
The first value range is greater than or equal to 0 and less than or equal to 2; the first coefficient value is 0.9;
the second value range is greater than 2 and less than or equal to 4; a second coefficient value of 1.1;
the third value range is more than 4 and less than or equal to 6; the third coefficient value is 1.3;
namely: when the absolute value of delta T1-B is more than or equal to 0 and less than or equal to 2 or the absolute value of A-delta T1 is more than or equal to 0 and less than or equal to 2 or the absolute value of C-delta T2 is more than or equal to 0 and less than or equal to 2 or the absolute value of delta T2-D is more than or equal to 0 and less than or equal to 2, the alpha is 0.9;
when 2 < DeltaT 1-B | ≦ 4 or 2 < | A-DeltaT 1| ≦ 4 or 2 < | C-DeltaT 2| ≦ 4 or 2 < DeltaT 2-D | ≦ 4, α is 1.1;
when 4 < | Δ T1-B | ≦ 6 or 4 < | A- Δ T1| ≦ 6 or 4 < | C- Δ T2| ≦ 6 or 4 < | Δ T2-D | ≦ 6, α is 1.3.
In the embodiment, the dynamic adjustment of the frequency of the cooling water pump and the frequency of the spray water pump of the evaporative cooler are realized through the signal feedback of the temperature difference of the water inlet and the water outlet in the heat exchange pipe and the temperature difference of the wet bulb of the filler outlet and the evaporative cold air outlet of the evaporative cooler, and the possibility that the running stability and the economical efficiency of the system are poor due to too high or too low frequency of the water pump is reduced.
Fig. 4 is a functional structure diagram of a water pump frequency control device according to an embodiment of the present application, and as shown in fig. 4, the water pump frequency control device includes:
the calculating module 41 is used for calculating the temperature difference of inlet and outlet water of the heat exchange tube;
and the first adjusting module 42 is used for adjusting the frequency of the cooling water pump according to a first experimental formula so that the frequency of the water pump reaches a preset target range when the temperature difference of the inlet water and the outlet water of the heat exchange tube exceeds a first preset temperature difference range.
In some embodiments, further comprising:
a judging module 43, configured to judge whether the temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet wet bulb satisfies a second preset temperature difference range when the temperature difference between the inlet and the outlet of the heat exchange tube satisfies the first preset temperature difference range
And the second adjusting module 44 is configured to adjust the frequency of the spray water pump according to a second empirical formula so that the frequency of the spray water pump reaches a preset target range when the temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet wet bulb exceeds a second preset temperature difference range.
In this embodiment, calculate the business turn over water difference in temperature of heat exchange tube through the calculation module, first adjusting module when the business turn over water difference in temperature of heat exchange tube surpasss first preset difference in temperature scope, adjust the cooling water pump frequency according to first experimental formula so that the water pump frequency reaches preset target range, solved the unmatched problem that leads to the business turn over water difference in the heat exchange tube of mismatching of cooling water pump frequency not to reach the requirement, the temperature fluctuation is big, improve system operation stability and economic nature, be favorable to the popularization of evaporative cooler.
Fig. 5 is a schematic structural diagram of an evaporative cooler provided in an embodiment of the present application, and as shown in fig. 5, the evaporative cooler 1 includes:
a cooling water pump 3 and a controller 13, wherein the controller 13 comprises a water pump frequency control device as described in the above embodiment;
the heat exchange pipe 6, an inlet water temperature sensor 10 arranged at the inlet of the heat exchange pipe and an outlet water temperature sensor 11 arranged at the outlet of the heat exchange pipe;
the controller 13 calculates the temperature difference between the inlet water and the outlet water of the heat exchange tube according to the temperature parameters obtained by the inlet water temperature sensor 10 and the outlet water temperature sensor 11, and adjusts the frequency of the cooling water pump according to a first experimental formula when the temperature difference between the inlet water and the outlet water of the heat exchange tube exceeds a first preset temperature difference range so that the frequency of the water pump reaches a preset target range.
In some embodiments, further comprising:
the spray water pump 5, the wet bulb temperature sensor 9 arranged at the air outlet and the wet bulb temperature sensor 12 arranged at the filler outlet;
the controller 13 is further configured to calculate a wet bulb temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet according to temperature parameters obtained by the wet bulb temperature sensor and the filler outlet wet bulb temperature sensor, and adjust the frequency of the spray water pump according to a second empirical formula so that the frequency of the spray water pump reaches a preset target range when the wet bulb temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet exceeds two preset temperature difference ranges.
In some embodiments, the water tank 2, the filler 4, the spray head 7, and the evaporative cooler fan 8 are also included.
In this embodiment, the evaporative cooler mainly includes: the system comprises an evaporative cooler 1, a water tank 2, a cooling water pump 3, a filler 4, a spray water pump 5, a heat exchange pipe 6, a spray head 7, an evaporative cooler fan 8, an air outlet wet bulb temperature sensor 9, an inlet water temperature sensor 10, an outlet water temperature sensor 11, a filler outlet wet bulb temperature sensor 12 and a controller 13. The inlet water temperature sensor 10 and the outlet water temperature sensor 11 are used for measuring the inlet and outlet water temperatures of cooling water in the heat exchange tube, and feeding signals back to the controller 13. The controller 13 further adjusts the frequency of the cooling water pump 3 according to the temperature difference between the inlet and outlet water in the pipe.
The filler outlet wet bulb temperature sensor 12 and the air outlet wet bulb temperature sensor 9 are used for measuring the wet bulb temperature of the filler outlet and the air of the evaporative cooling air outlet and transmitting signals to the controller 13. The controller 13 calculates the wet-bulb temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet, and adjusts the frequency of the spray water pump of the evaporative cooler according to the wet-bulb temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet.
In the embodiment, the dynamic adjustment of the frequency of the cooling water pump and the spray water pump of the evaporative cooler is realized through the signal feedback of the temperature difference of water inlet and outlet in the pipe and the temperature difference of wet balls at the filler outlet and the evaporative cooling air outlet of the evaporative cooler.
The present embodiment provides an air conditioning system including: an evaporative cooler as described in the previous embodiments.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
It should be noted that the present invention is not limited to the above-mentioned preferred embodiments, and those skilled in the art can obtain other products in various forms without departing from the spirit of the present invention, but any changes in shape or structure can be made within the scope of the present invention with the same or similar technical solutions as those of the present invention.
Claims (10)
1. A method of controlling water pump frequency, comprising:
calculating the temperature difference of inlet and outlet water of the heat exchange tube;
when the temperature difference of the inlet water and the outlet water of the heat exchange pipe exceeds a first preset temperature difference range, the frequency of the cooling water pump is adjusted according to a first experimental formula so as to enable the frequency of the water pump to reach a preset target range,
the first preset temperature difference range comprises a first lower limit value and a first upper limit value, the frequency of the cooling water pump is adjusted according to a first experimental formula so that the frequency of the water pump reaches a preset target range, and the method comprises the following steps:
when the temperature difference of the inlet water and the outlet water of the heat exchange tube is larger than or equal to a first upper limit value, adjusting the frequency of a cooling water pump according to a first experimental formula so as to enable the temperature difference of the inlet water and the outlet water of the heat exchange tube to meet a preset target range;
the first empirical formula is: the frequency of the cooling water pump is equal to the initial frequency value plus an empirical coefficient (a first upper limit value-a first lower limit value)/2;
the empirical coefficient is valued according to a preset rule;
the preset rules include:
when the difference value between the temperature difference and the upper limit value or the lower limit value is in a first value range, the empirical coefficient is a first coefficient value;
when the difference value between the temperature difference and the upper limit value or the lower limit value is in a second value range, the empirical coefficient is a second coefficient value;
when the difference value between the temperature difference and the upper limit value or the lower limit value is in a third value range, the empirical coefficient is a third coefficient value;
the first value range is greater than or equal to 0 and less than or equal to 2; the first coefficient value is 0.9;
the second value range is greater than 2 and less than or equal to 4; a second coefficient value of 1.1;
the third value range is greater than 4 and less than or equal to 6; the third coefficient value is 1.3.
2. The water pump frequency control method according to claim 1, wherein the preset target range includes:
the temperature difference of inlet and outlet water of the heat exchange tube is in a first preset temperature difference range,
or the like, or, alternatively,
the temperature difference of the inlet water and the outlet water of the heat exchange pipe is in a first preset temperature difference range, and the temperature difference of the evaporative cooler filler outlet and the evaporative cooling air outlet wet bulb is in a second preset temperature difference range.
3. The water pump frequency control method according to claim 2, further comprising:
when the temperature difference of the inlet water and the outlet water of the heat exchange pipe meets a first preset temperature difference range, judging whether the temperature difference between a filler outlet of the evaporative cooler and a wet bulb of an evaporative cooling air outlet meets a second preset temperature difference range;
and if so, judging that the frequency of the water pump reaches a preset target range.
4. The water pump frequency control method according to claim 3, further comprising:
when the temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet wet bulb exceeds a second preset temperature difference range, adjusting the frequency of the spray water pump according to a second empirical formula so that the frequency of the spray water pump reaches a preset target range, wherein the second preset temperature difference range comprises a second lower limit value and a second upper limit value, and adjusting the frequency of the spray water pump according to the second empirical formula so that the frequency of the spray water pump reaches the preset target range, the method comprises the following steps:
when the temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet wet bulb is smaller than or equal to a second lower limit value, adjusting the frequency of the spray water pump according to a second empirical formula so that the temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet wet bulb meets a preset target range;
the second empirical formula is: the frequency of the spray water pump is equal to the initial frequency value-empirical coefficient (second upper limit value-second lower limit value)/2;
the empirical coefficient is valued according to a preset rule;
the preset rules include:
when the difference value between the temperature difference and the upper limit value or the lower limit value is in a first value range, the empirical coefficient is a first coefficient value;
when the difference value between the temperature difference and the upper limit value or the lower limit value is in a second value range, the empirical coefficient is a second coefficient value;
when the difference value between the temperature difference and the upper limit value or the lower limit value is in a third value range, the empirical coefficient is a third coefficient value;
the first value range is greater than or equal to 0 and less than or equal to 2; the first coefficient value is 0.9;
the second value range is greater than 2 and less than or equal to 4; a second coefficient value of 1.1;
the third value range is greater than 4 and less than or equal to 6; the third coefficient value is 1.3.
5. The water pump frequency control method according to claim 1, wherein the adjusting the cooling water pump frequency according to the first empirical formula to bring the water pump frequency to a preset target range further comprises:
when the temperature difference of the inlet water and the outlet water of the heat exchange tube is smaller than or equal to a first lower limit value, the frequency of the cooling water pump is adjusted according to a first experimental formula, so that the temperature difference of the inlet water and the outlet water of the heat exchange tube meets a preset target range.
6. The water pump frequency control method of claim 4, wherein the adjusting the spray pump frequency according to the second empirical formula to bring the water pump frequency to a preset target range further comprises:
and when the temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet wet bulb is greater than or equal to a second lower limit value, adjusting the frequency of the spray water pump according to a second empirical formula so that the temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet wet bulb meets a preset target range.
7. A water pump frequency control apparatus, comprising:
the calculation module is used for calculating the temperature difference of inlet and outlet water of the heat exchange tube;
the first adjusting module is used for adjusting the frequency of the cooling water pump according to a first experimental formula so that the frequency of the water pump reaches a preset target range when the temperature difference of inlet and outlet water of the heat exchange tube exceeds a first preset temperature difference range;
the first preset temperature difference range comprises a first lower limit value and a first upper limit value, the frequency of the cooling water pump is adjusted according to a first experimental formula so that the frequency of the water pump reaches a preset target range, and the method comprises the following steps:
when the temperature difference of the inlet water and the outlet water of the heat exchange tube is larger than or equal to a first upper limit value, adjusting the frequency of a cooling water pump according to a first experimental formula so as to enable the temperature difference of the inlet water and the outlet water of the heat exchange tube to meet a preset target range;
the first empirical formula is: the frequency of the cooling water pump is equal to the initial frequency value plus an empirical coefficient (a first upper limit value-a first lower limit value)/2;
the empirical coefficient is valued according to a preset rule;
the preset rules include:
when the difference value between the temperature difference and the upper limit value or the lower limit value is in a first value range, the empirical coefficient is a first coefficient value;
when the difference value between the temperature difference and the upper limit value or the lower limit value is in a second value range, the empirical coefficient is a second coefficient value;
when the difference value between the temperature difference and the upper limit value or the lower limit value is in a third value range, the empirical coefficient is a third coefficient value;
the first value range is greater than or equal to 0 and less than or equal to 2; the first coefficient value is 0.9;
the second value range is greater than 2 and less than or equal to 4; a second coefficient value of 1.1;
the third value range is greater than 4 and less than or equal to 6; the third coefficient value is 1.3.
8. An evaporative cooler, comprising:
a cooling water pump, a controller, the controller comprising the water pump frequency control device of claim 7;
the water inlet temperature sensor is arranged at the inlet of the heat exchange tube, and the water outlet temperature sensor is arranged at the outlet of the heat exchange tube;
the controller calculates the water inlet and outlet temperature difference of the heat exchange tube according to the temperature parameters obtained by the water inlet temperature sensor and the water outlet temperature sensor at the outlet, and when the water inlet and outlet temperature difference of the heat exchange tube exceeds a first preset temperature difference range, the frequency of the cooling water pump is adjusted according to a first experimental formula so that the frequency of the water pump reaches a preset target range.
9. The evaporative cooler of claim 8, further comprising:
the spray pump, the wet bulb temperature sensor arranged at the air outlet and the wet bulb temperature sensor arranged at the filler outlet are arranged on the filter;
the controller is also used for calculating the wet bulb temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet according to the temperature parameters obtained by the wet bulb temperature sensor and the filler outlet wet bulb temperature sensor, and when the wet bulb temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet exceeds a second preset temperature difference range, the frequency of the spray water pump is adjusted according to a second empirical formula so that the frequency of the spray water pump reaches a preset target range;
the second preset temperature difference range comprises a second lower limit value and a second upper limit value, and the adjusting of the frequency of the spray water pump according to a second empirical formula enables the frequency of the spray water pump to reach a preset target range, and the adjusting of the frequency of the spray water pump comprises the following steps:
when the temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet wet bulb is smaller than or equal to a second lower limit value, adjusting the frequency of the spray water pump according to a second empirical formula so that the temperature difference between the evaporative cooler filler outlet and the evaporative cooling air outlet wet bulb meets a preset target range;
the second empirical formula is: the frequency of the spray water pump is equal to the initial frequency value-empirical coefficient (second upper limit value-second lower limit value)/2;
the empirical coefficient is valued according to a preset rule;
the preset rules include:
when the difference value between the temperature difference and the upper limit value or the lower limit value is in a first value range, the empirical coefficient is a first coefficient value;
when the difference value between the temperature difference and the upper limit value or the lower limit value is in a second value range, the empirical coefficient is a second coefficient value;
when the difference value between the temperature difference and the upper limit value or the lower limit value is in a third value range, the empirical coefficient is a third coefficient value;
the first value range is greater than or equal to 0 and less than or equal to 2; the first coefficient value is 0.9;
the second value range is greater than 2 and less than or equal to 4; a second coefficient value of 1.1;
the third value range is greater than 4 and less than or equal to 6; the third coefficient value is 1.3.
10. An air conditioning system, comprising: an evaporative cooler as claimed in claim 8 or 9.
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| CN114413358B (en) * | 2021-12-24 | 2023-05-26 | 珠海格力电器股份有限公司 | Indirect evaporative cooling air conditioner, control method thereof, storage medium and control equipment |
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| CN104596040A (en) * | 2015-02-04 | 2015-05-06 | 珠海格力电器股份有限公司 | Water pump control method and system of air conditioner cooling system and household central air conditioner |
| CN105318460B (en) * | 2015-10-15 | 2018-01-23 | 珠海格力电器股份有限公司 | Control system, control method and apply its handpiece Water Chilling Units |
| CN108006919B (en) * | 2017-11-15 | 2020-02-11 | 珠海格力电器股份有限公司 | Evaporative cooling type water chilling unit, and control method and control system thereof |
| CN111457542A (en) * | 2020-04-20 | 2020-07-28 | 宁波奥克斯电气股份有限公司 | Variable frequency water pump operation control method and device and air conditioning system |
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