CN114413358B - Indirect evaporative cooling air conditioner, control method thereof, storage medium and control equipment - Google Patents

Abstract

The invention relates to the technical field of air conditioners, in particular to an indirect evaporative cooling air conditioner, a control method, a storage medium and control equipment thereof, wherein the method comprises the following steps: acquiring the dry bulb temperature of a primary air outlet, the wet bulb temperature of a secondary air inlet and the wet bulb temperature of a secondary air outlet of the indirect evaporative cooling air conditioner; calculating the wet bulb enthalpy difference between the secondary air inlet and the secondary air outlet based on the secondary air inlet wet bulb temperature and the secondary air outlet wet bulb temperature; based on the dry bulb temperature and wet bulb enthalpy difference of the primary air outlet, adjusting the running state of the indirect evaporative cooling air conditioner to control the dry bulb temperature of the primary air outlet within a first target range and control the wet bulb enthalpy difference within a second target range; the operation state of the indirect evaporative cooling air conditioner can be adjusted from multiple angles, and the power consumption required by adjusting the operation state of the indirect evaporative cooling air conditioner is reduced.

Description

Indirect evaporative cooling air conditioner, control method thereof, storage medium and control equipment

Technical Field

The invention relates to the technical field of air conditioners, in particular to an indirect evaporative cooling air conditioner, a control method thereof, a storage medium, control equipment and an air conditioner.

Background

The refrigerating capacity of the indirect evaporative cooling air conditioning unit is affected by the temperature and humidity of outdoor fresh air. At present, the air supply quantity is regulated by changing the rotating speed of a fan so as to meet the indoor cold load demand. However, the power consumption of the adjusting fan is high, so that the energy consumption of the air conditioner control is high.

It follows that there is a need in the art for a solution to optimize the energy consumption of indirect evaporative cooling air conditioning control.

Disclosure of Invention

The invention provides an indirect evaporative cooling air conditioner, a control method, a storage medium and control equipment thereof, which solve the technical problem of higher energy consumption of the control of the indirect evaporative cooling air conditioner in the prior art.

In a first aspect, the present invention provides a control method of an indirect evaporative cooling air conditioner, including:

acquiring the dry bulb temperature of a primary air outlet, the wet bulb temperature of a secondary air inlet and the wet bulb temperature of a secondary air outlet of the indirect evaporative cooling air conditioner;

calculating the wet bulb enthalpy difference between the secondary air inlet and the secondary air outlet based on the secondary air inlet wet bulb temperature and the secondary air outlet wet bulb temperature;

based on the dry bulb temperature and wet bulb enthalpy difference of the primary air outlet, the operation state of the indirect evaporative cooling air conditioner is adjusted so as to control the dry bulb temperature of the primary air outlet within a first target range and the wet bulb enthalpy difference within a second target range.

In some embodiments, adjusting the operating state of an indirect evaporative cooling air conditioner includes: and adjusting the operating frequency of the water pump, the operating frequency of the primary fan and/or the operating frequency of the secondary fan.

In some embodiments, when the primary air outlet dry bulb temperature is less than a preset dry bulb temperature lower limit, adjusting the operation state of the indirect evaporative cooling air conditioner based on the primary air outlet dry bulb temperature and the wet bulb enthalpy difference, including:

if the wet-ball enthalpy difference is higher than the preset wet-ball enthalpy difference upper limit, reducing the running frequency of the water pump;

if the wet-ball enthalpy difference is between the preset wet-ball enthalpy difference upper limit and the preset wet-ball enthalpy difference intermediate value, reducing the operation frequency of the secondary fan;

if the wet-ball enthalpy difference is lower than the preset wet-ball enthalpy difference intermediate value, the operation frequency of the primary fan is increased.

In some embodiments, when the primary air outlet dry bulb temperature is between the preset dry bulb temperature lower limit and the preset dry bulb temperature upper limit, adjusting the operation state of the indirect evaporative cooling air conditioner based on the primary air outlet dry bulb temperature and the wet bulb enthalpy difference, including:

if the wet-ball enthalpy difference is lower than a preset wet-ball enthalpy difference lower limit, increasing the operating frequency of the water pump;

if the wet-ball enthalpy difference is higher than the preset wet-ball enthalpy difference upper limit, the operation frequency of the water pump is reduced.

In some embodiments, when the primary air outlet dry bulb temperature is greater than a preset dry bulb temperature upper limit, adjusting the operation state of the indirect evaporative cooling air conditioner based on the primary air outlet dry bulb temperature and the wet bulb enthalpy difference includes:

if the wet-ball enthalpy difference is lower than a preset wet-ball enthalpy difference lower limit, increasing the operating frequency of the water pump;

if the wet-ball enthalpy difference is higher than the preset wet-ball enthalpy difference upper limit, the operation frequency of the secondary air blower is increased;

if the wet-ball enthalpy difference is between the preset wet-ball enthalpy difference upper limit and the preset wet-ball enthalpy difference intermediate value, increasing the operating frequency of the water pump and the operating frequency of the secondary fan;

if the wet-ball enthalpy difference is between the preset wet-ball enthalpy difference lower limit and the preset wet-ball enthalpy difference intermediate value, the operation frequency of the primary fan is reduced.

In a second aspect, the present invention provides a control device of an indirect evaporative cooling air conditioner, comprising:

the acquisition module is used for acquiring the dry bulb temperature of the primary air outlet, the wet bulb temperature of the secondary air inlet and the wet bulb temperature of the secondary air outlet of the indirect evaporative cooling air conditioner;

the calculating module is used for calculating the wet bulb enthalpy difference between the secondary air inlet and the secondary air outlet based on the wet bulb temperature of the secondary air inlet and the wet bulb temperature of the secondary air outlet;

and the adjusting module is used for adjusting the running state of the indirect evaporative cooling air conditioner based on the dry bulb temperature of the primary air outlet and the wet bulb enthalpy difference so as to control the dry bulb temperature of the primary air outlet within a first target range and control the wet bulb enthalpy difference within a second target range.

In a third aspect, the present invention provides a storage medium having stored thereon a computer program which, when executed by one or more processors, implements a method of controlling an indirect evaporative cooling air conditioner as in the first aspect.

In a fourth aspect, the present invention provides a control apparatus comprising a memory and one or more processors, the memory having stored thereon a computer program which, when executed by the one or more processors, implements a control method of an indirect evaporative cooling air conditioner as in the first aspect.

In a fifth aspect, the present invention provides an indirect evaporative cooling air conditioner comprising the control device of the fourth aspect.

In some embodiments, the indirect evaporative cooling air conditioner further comprises:

the temperature sensing device is arranged at the primary air outlet, the secondary air inlet and/or the secondary air outlet, is connected with the control equipment and is used for collecting the dry bulb temperature of the primary air outlet, the wet bulb temperature of the secondary air inlet and the wet bulb temperature of the secondary air outlet.

According to the indirect evaporative cooling air conditioner, the control method, the storage medium and the control equipment thereof, the primary air outlet dry bulb temperature, the secondary air inlet wet bulb temperature and the secondary air outlet wet bulb temperature of the indirect evaporative cooling air conditioner are obtained; calculating the wet bulb enthalpy difference between the secondary air inlet and the secondary air outlet based on the secondary air inlet wet bulb temperature and the secondary air outlet wet bulb temperature; based on the dry bulb temperature and wet bulb enthalpy difference of the primary air outlet, adjusting the running state of the indirect evaporative cooling air conditioner to control the dry bulb temperature of the primary air outlet within a first target range and control the wet bulb enthalpy difference within a second target range; the operation state of the indirect evaporative cooling air conditioner can be adjusted from multiple angles, and the power consumption required by adjusting the operation state of the indirect evaporative cooling air conditioner is reduced.

Drawings

The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings:

FIG. 1 is a flow chart of a control method of an indirect evaporative cooling air conditioner according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an indirect evaporative cooling air conditioner according to an embodiment of the present invention;

fig. 3 is a schematic control diagram of an indirect evaporative cooling air conditioner according to an embodiment of the present invention.

In the drawings, like parts are given like reference numerals, and the drawings are not drawn to scale.

Detailed Description

In order to better understand the technical solutions of the present invention and how to apply technical means to solve the technical problems of the present invention, and to fully understand and implement the implementation process of achieving the corresponding technical effects, the following description will clearly and completely describe the technical solutions of the embodiments of the present invention with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The embodiment of the invention and the characteristics in the embodiment can be mutually combined on the premise of no conflict, and the formed technical scheme is within the protection scope of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.

Example 1

Fig. 1 is a flowchart of an air conditioner control method according to an embodiment of the present invention. As shown in fig. 1, an air conditioner control method includes:

step S1, acquiring the dry bulb temperature of a primary air outlet, the wet bulb temperature of a secondary air inlet and the wet bulb temperature of a secondary air outlet of an indirect evaporative cooling air conditioner;

step S2, calculating the wet bulb enthalpy difference between the secondary air inlet and the secondary air outlet based on the wet bulb temperature of the secondary air inlet and the wet bulb temperature of the secondary air outlet;

and step S3, adjusting the running state of the indirect evaporative cooling air conditioner based on the dry bulb temperature of the primary air outlet and the wet bulb enthalpy difference so as to control the dry bulb temperature of the primary air outlet within a first target range and control the wet bulb enthalpy difference within a second target range.

In some embodiments, adjusting the operating state of an indirect evaporative cooling air conditioner includes: and adjusting the operating frequency of the water pump, the operating frequency of the primary fan and/or the operating frequency of the secondary fan.

In practical application, the control method of the present embodiment may be applied to an indirect evaporative cooling air conditioner shown in fig. 2, where the air conditioner includes:

the heat exchange device 9 adopts a vertical heat exchanger and comprises a plurality of heat exchange pipes for carrying out heat exchange on primary air entering from a primary air inlet and secondary air entering from a secondary space air inlet, wherein the inner side of the heat exchange pipe provides a passage for the secondary air, and a passage is provided between the outer side of the heat exchange pipe and the shell of the heat exchange device 9; the primary air is dry air entering the outer side of each radiating pipe from the atmospheric environment, and the secondary air is air entering the inner side of each radiating pipe from the atmospheric environment.

The water pump 1 is used for delivering water to the upper part of the heat exchange device 9, and spraying the water of the water pump to the inner side of the heat exchange device 9 through the spray head 10 which is arranged above the heat exchange device 9 and connected with the water pump so as to cool the secondary air; the dry secondary air is mixed with spray water mist sprayed from a spray nozzle 10 above the heat exchange pipe at the inner side of the heat exchange pipe, and the enthalpy-increasing humidifying process of the dry secondary air is realized through water mist evaporation, so that the dry secondary air is finally converted into wet secondary air. The number of the spray heads 10 can be determined according to the number of the heat exchange pipes of the heat exchange device 9;

the secondary air blower 2 is arranged above the heat exchange device 9 and is used for enabling secondary air to flow through the inner sides of the heat exchange tubes so as to exchange heat with the heat exchange tubes and reduce the temperature of the heat exchange tubes; the secondary fan 2 can be a variable frequency fan;

the primary air blower 3 is arranged at one side of the heat exchange device and is used for sucking annular air into the outer space of the heat exchange device 9 through a primary air inlet to form primary air, so that the primary air flows through the outer side of the heat exchange device 9 and exchanges heat with each radiating pipe of the heat exchange pipe device 9, the primary air realizes the along-the-way constant-humidity cooling, and the cooled primary air is finally sent into a cooling area;

the water tank 4 is arranged below the heat exchange device 9, is connected with the water pump 1, and is used for collecting water flowing out of each heat exchange tube and providing a water source for the water pump;

and a control device 8 for implementing the control method provided in the present embodiment.

When the indirect evaporative cooling air conditioner is in operation, the water mist sprayed by the spray head 10 and the secondary air entering the heat exchange pipe are subjected to heat mass exchange, and the secondary air entering the heat exchange pipe is humidified and cooled. The indirect evaporative cooling air conditioner utilizes cold energy generated by secondary air evaporative cooling to absorb heat of primary air, so that the constant humidity cooling of the primary air is realized. Since the secondary air entering the heat exchange tubes is at a lower temperature than the primary air, the primary air transfers heat to the secondary air through the walls of the heat exchange tubes, which ultimately converts to high temperature and high humidity gas and is exhausted to the atmosphere through the secondary air blower 2. The water mist sprayed from the spray head 10 above the heat exchange pipe is partially evaporated and then is carried away by secondary air, and the other part is not evaporated and finally falls into the water tank 4 under the action of gravity. The water pump 1 sends the water in the water tank 4 to the spray head 10 for spraying again, so that the closed circulation of the spray water system is realized. The water tank 4 is also provided with a water supplementing port for compensating the floating water loss generated by the evaporation and sputtering of the spray water.

The refrigerating capacity of the indirect evaporative cooling air conditioner is influenced by a plurality of factors such as primary air volume, secondary air volume, spray water volume and the like, so that the energy efficiency can be optimized by comprehensively adjusting the primary air volume, secondary air volume, spray water volume and the like of the indirect evaporative cooling air conditioner on the premise of meeting the cold load of the indirect evaporative cooling air conditioner. Specifically, in this embodiment, the dry bulb temperature of the primary air outlet, the wet bulb temperature of the secondary air inlet and the wet bulb temperature of the secondary air outlet of the indirect evaporative cooling air conditioner are obtained, and based on the wet bulb temperature of the secondary air inlet and the wet bulb temperature of the secondary air outlet, the wet bulb enthalpy difference between the secondary air inlet and the secondary air outlet is calculated, so as to obtain data required by controlling the indirect evaporative cooling air conditioner, and further based on the dry bulb temperature and the wet bulb enthalpy difference of the primary air outlet, the operation state of the indirect evaporative cooling air conditioner is adjusted, so that the dry bulb temperature of the primary air outlet is controlled within a first target range, and the wet bulb enthalpy difference is controlled within a second target range; the operation state of the indirect evaporative cooling air conditioner can be adjusted from multiple angles of the primary air blower, the secondary air blower, the water pump and the like, rather than the operation state of the indirect evaporative cooling air conditioner which is adjusted by the air blower, so that the energy consumption of the air conditioner is reduced on the premise of ensuring that the cooling load requirement is met, and the indirect evaporative cooling air conditioner is operated in an optimal state.

Example two

FIG. 3 is a schematic diagram of an indirect evaporative cooling air conditioner control. As shown in fig. 3, on the basis of the above embodiment, when the primary air outlet dry-bulb temperature is less than the preset dry-bulb temperature lower limit, the operation state of the indirect evaporative cooling air conditioner is adjusted based on the primary air outlet dry-bulb temperature and the wet-bulb enthalpy difference, including:

if the wet-ball enthalpy difference is higher than the preset wet-ball enthalpy difference upper limit, reducing the running frequency of the water pump;

if the wet-ball enthalpy difference is between the preset wet-ball enthalpy difference upper limit and the preset wet-ball enthalpy difference intermediate value, reducing the operation frequency of the secondary fan;

if the wet-ball enthalpy difference is lower than the preset wet-ball enthalpy difference intermediate value, the operation frequency of the primary fan is increased.

In this embodiment, some of the identifiers will be described first.

t1 represents the dry bulb temperature of the primary air outlet;

Δh represents the secondary air inlet-outlet wet-bulb enthalpy difference, i.e., Δh = secondary air outlet enthalpy-secondary air inlet enthalpy; the enthalpy value has a functional relation with the wet bulb temperature, i.e. the corresponding enthalpy value can be calculated by the measured wet bulb temperature.

The value A represents the lower limit value of the dry bulb temperature of the primary air outlet, which is also called the preset lower limit value of the dry bulb temperature;

the B value represents the upper limit value of the dry bulb temperature of the primary air outlet, which is also called a preset upper limit value of the dry bulb temperature;

c represents the lower limit value of the wet-ball enthalpy difference of the secondary air inlet and outlet, which is also called as the preset lower limit value of the wet-ball enthalpy difference, and the value of C is 20;

d represents the intermediate value of the wet-ball enthalpy difference of the secondary air inlet and outlet, which is also called as the preset intermediate value of the wet-ball enthalpy difference, and the value of D is 28;

e represents the upper limit value of the wet-ball enthalpy difference of the secondary air inlet and outlet, which is also called the preset upper limit value of the wet-ball enthalpy difference, and the value of E is 36 for example.

In this embodiment, when the primary air outlet dry bulb temperature t1 is less than the preset dry bulb temperature lower limit a, the wet bulb enthalpy difference Δh of the secondary air inlet and outlet is detected:

(1) If the wet-bulb enthalpy difference delta H of the secondary air inlet and outlet is higher than the preset wet-bulb enthalpy difference upper limit E, namely delta H is larger than E, the secondary air side heat exchange effect exceeds the normal level, and the water evaporation heat exchange capacity is larger due to the fact that the spraying water quantity is larger at the moment, and the running frequency of the variable-frequency spray water pump is reduced at the moment; the method is characterized in that the running frequency and/or the power of the spray water pump 1 are reduced under the condition that the temperature of the air outlet is ensured to be in a reasonable range, so that the effect of energy-saving control is achieved.

(2) If the wet-bulb enthalpy difference is between the preset upper limit of the wet-bulb enthalpy difference and the preset middle value of the wet-bulb enthalpy difference, namely D is less than or equal to delta H is less than or equal to E, which indicates that the secondary side heat exchange effect exceeds the normal level, at the moment, the secondary air side air quantity is considered to be larger, so that the secondary air side heat exchange effect is better, and the secondary air side heat exchange effect is reduced by reducing the frequency of the secondary air fan; the method is characterized in that under the condition that the temperature of the air outlet is ensured to be in a reasonable range, the power of the secondary air blower is reduced, and the effect of energy-saving control is achieved.

(3) If the wet-bulb enthalpy difference is lower than a preset wet-bulb enthalpy difference intermediate value, namely delta H is smaller than D, the secondary side heat exchange effect is at a normal level, at the moment, the primary air side air quantity is considered to be smaller, so that the primary air outlet temperature is lower, and the primary air side air quantity is increased, namely the frequency of the primary fan is increased; the primary air side air quantity is improved, and the primary air side air outlet temperature is controlled within a reasonable range.

According to the embodiment, the automatic control strategy realized by the control method provided by the embodiment is applied to the indirect evaporative cooling air conditioner, so that the primary air output and the secondary air output of the air conditioner are controlled by adjusting the running frequency of the fan under the condition that the primary air output temperature is in a reasonable range, and the spraying water quantity is controlled by adjusting the running frequency of the water pump, so that the optimal control of the air conditioner is realized, the power of the fan and the water pump is minimized, and the energy-saving control effect is achieved.

Example III

On the basis of the above embodiment, when the dry-bulb temperature of the primary air outlet is between the preset dry-bulb temperature lower limit and the preset dry-bulb temperature upper limit, the operation state of the indirect evaporative cooling air conditioner is adjusted based on the dry-bulb temperature and the wet-bulb enthalpy difference of the primary air outlet, including:

if the wet-ball enthalpy difference is lower than a preset wet-ball enthalpy difference lower limit, increasing the operating frequency of the water pump;

if the wet-ball enthalpy difference is higher than the preset wet-ball enthalpy difference upper limit, the operation frequency of the water pump is reduced.

In this embodiment, when the primary air outlet dry bulb temperature is between the preset dry bulb temperature lower limit and the preset dry bulb temperature upper limit, that is, a is equal to or less than t1 and equal to or less than B, the secondary air side inlet enthalpy difference is detected:

(1) If the wet-bulb enthalpy difference is lower than the preset wet-bulb enthalpy difference lower limit, namely delta H < C, the secondary air side enthalpy difference is smaller at the moment, which means that the water evaporation amount is smaller, and the operation frequency of the spray water pump is increased at the moment; after the spray water quantity at the secondary air side is improved, the water evaporation quantity is increased, so that the heat exchange stability in the heat exchange tube is ensured, and the temperature of the dry bulb at the primary air outlet is stably controlled within A is less than or equal to t1 and less than or equal to B.

(2) If the wet ball enthalpy difference is higher than the preset upper limit of the wet ball enthalpy difference, namely delta H & gtE, the enthalpy difference of the secondary air side inlet outlet is larger, namely the water evaporation capacity is larger, so that the wet ball temperature is rapidly increased, the frequency of the variable-frequency water pump is reduced, the operation frequency of the variable-frequency water pump is reduced under the condition that the temperature of the primary air outlet is in a reasonable range, and the energy-saving control effect is achieved;

(3) If the secondary air side inlet-outlet enthalpy difference is between the secondary air side enthalpy difference lower limit value and the secondary air side enthalpy difference upper limit value, namely C < delta H < E, the enthalpy difference is considered to be in a proper range, and the operation frequencies of the primary air, the secondary air fan and the spray water pump keep the existing state, so that the primary air outlet temperature is in a reasonable range, and the power of the primary air/secondary air fan and the power of the water pump are in a reasonable range.

According to the embodiment, the automatic control strategy realized by the control method of the embodiment is applied to the indirect evaporative cooling air conditioner, the water spraying quantity is controlled by adjusting the running frequency of the water pump under the condition that the air outlet temperature of primary air is in a reasonable range, so that the optimal control of the air conditioner is realized, the power of a fan and the power of a water pump are minimized, and the effect of energy-saving control is achieved.

Example IV

On the basis of the above embodiment, when the primary air outlet dry-bulb temperature is greater than the preset dry-bulb temperature upper limit, the operation state of the indirect evaporative cooling air conditioner is adjusted based on the primary air outlet dry-bulb temperature and the wet-bulb enthalpy difference, including:

if the wet-ball enthalpy difference is lower than a preset wet-ball enthalpy difference lower limit, increasing the operating frequency of the water pump;

if the wet-ball enthalpy difference is higher than the preset wet-ball enthalpy difference upper limit, the operation frequency of the secondary air blower is increased;

if the wet-ball enthalpy difference is between the preset wet-ball enthalpy difference upper limit and the preset wet-ball enthalpy difference intermediate value, increasing the operating frequency of the water pump and the operating frequency of the secondary fan;

if the wet-ball enthalpy difference is between the preset wet-ball enthalpy difference lower limit and the preset wet-ball enthalpy difference intermediate value, the operation frequency of the primary fan is reduced.

In this embodiment, when the dry bulb temperature of the primary air outlet is greater than the preset upper dry bulb temperature limit, i.e., t1 > B, the enthalpy difference of the secondary air side inlet is detected:

(1) If the wet-bulb enthalpy difference is lower than the preset wet-bulb enthalpy difference lower limit, namely delta H < C, the secondary air side enthalpy difference is smaller at the moment, which means that the water evaporation amount is smaller, and the operation frequency of the spray water pump is increased at the moment; the water evaporation amount is increased due to the increase of the spray water quantity, the secondary air side heat exchange effect is enhanced, and the temperature of the air-dried balls discharged from the primary air side is reduced;

(2) If the wet-bulb enthalpy difference is higher than the preset upper limit of the wet-bulb enthalpy difference, namely delta H is larger than E, the enthalpy difference is larger, the air quantity is smaller, and the operation frequency of the secondary air blower is increased; the air quantity of the secondary air side is increased, the heat exchange effect of the secondary air side is enhanced, and the temperature of the air-dried balls discharged from the primary air side is reduced.

(3) If the wet-ball enthalpy difference is between the preset upper limit of the wet-ball enthalpy difference and the preset intermediate value of the wet-ball enthalpy difference, namely D is less than or equal to delta H and less than or equal to E, the enthalpy difference is larger at the moment, the air quantity and the spraying water quantity are smaller, and the secondary fan frequency and the spraying water pump frequency are increased at the same time;

(4) If the wet-bulb enthalpy difference is between the preset lower limit of the wet-bulb enthalpy difference and the preset intermediate value of the wet-bulb enthalpy difference, namely C is smaller than delta H and smaller than D, the secondary air side is normal in heat exchange, the primary air side air quantity is larger, so that the primary air-out ball temperature is higher, and the operation frequency of the primary fan is reduced. The power of the primary fan is optimized under the condition that the temperature of the primary air outlet air-dried balls is ensured to be in a reasonable range.

According to the embodiment, the automatic control strategy realized by the control method provided by the embodiment is applied to the indirect evaporative cooling air conditioner, so that the primary air output and the secondary air output of the air conditioner are controlled by adjusting the running frequency of the fan under the condition that the primary air output temperature is in a reasonable range, and the spraying water quantity is controlled by adjusting the running frequency of the water pump, so that the optimal control of the air conditioner is realized, the power of the fan and the water pump is minimized, and the energy-saving control effect is achieved.

Example five

On the basis of the above embodiments, this embodiment provides a control device of an indirect evaporative cooling air conditioner, including:

the acquisition module is used for acquiring the dry bulb temperature of the primary air outlet, the wet bulb temperature of the secondary air inlet and the wet bulb temperature of the secondary air outlet of the indirect evaporative cooling air conditioner;

the calculating module is used for calculating the wet bulb enthalpy difference between the secondary air inlet and the secondary air outlet based on the wet bulb temperature of the secondary air inlet and the wet bulb temperature of the secondary air outlet;

and the adjusting module is used for adjusting the running state of the indirect evaporative cooling air conditioner based on the dry bulb temperature of the primary air outlet and the wet bulb enthalpy difference so as to control the dry bulb temperature of the primary air outlet within a first target range and control the wet bulb enthalpy difference within a second target range.

In some embodiments, when the primary air outlet dry bulb temperature is less than a preset dry bulb temperature lower limit, adjusting the operation state of the indirect evaporative cooling air conditioner based on the primary air outlet dry bulb temperature and the wet bulb enthalpy difference, including:

if the wet-ball enthalpy difference is higher than the preset wet-ball enthalpy difference upper limit, reducing the running frequency of the water pump;

if the wet-ball enthalpy difference is between the preset wet-ball enthalpy difference upper limit and the preset wet-ball enthalpy difference intermediate value, reducing the operation frequency of the secondary fan;

if the wet-ball enthalpy difference is lower than the preset wet-ball enthalpy difference intermediate value, the operation frequency of the primary fan is increased.

In some embodiments, when the primary air outlet dry bulb temperature is between the preset dry bulb temperature lower limit and the preset dry bulb temperature upper limit, adjusting the operation state of the indirect evaporative cooling air conditioner based on the primary air outlet dry bulb temperature and the wet bulb enthalpy difference, including:

if the wet-ball enthalpy difference is lower than a preset wet-ball enthalpy difference lower limit, increasing the operating frequency of the water pump;

if the wet-ball enthalpy difference is higher than the preset wet-ball enthalpy difference upper limit, the operation frequency of the water pump is reduced.

In some embodiments, when the primary air outlet dry bulb temperature is greater than a preset dry bulb temperature upper limit, adjusting the operation state of the indirect evaporative cooling air conditioner based on the primary air outlet dry bulb temperature and the wet bulb enthalpy difference, including:

if the wet-ball enthalpy difference is lower than a preset wet-ball enthalpy difference lower limit, increasing the operating frequency of the water pump;

if the wet-ball enthalpy difference is higher than the preset wet-ball enthalpy difference upper limit, the operation frequency of the secondary air blower is increased;

if the wet-ball enthalpy difference is between the preset wet-ball enthalpy difference upper limit and the preset wet-ball enthalpy difference intermediate value, increasing the operating frequency of the water pump and the operating frequency of the secondary fan;

if the wet-ball enthalpy difference is between the preset wet-ball enthalpy difference lower limit and the preset wet-ball enthalpy difference intermediate value, the operation frequency of the primary fan is reduced.

Other details and beneficial effects of the technical features in this embodiment correspond to those of the foregoing embodiments, and are not described in detail in this embodiment.

Example six

On the basis of the above embodiments, the present embodiment provides a storage medium, on which a computer program is stored, which when executed by one or more processors, implements the control method of the indirect evaporative cooling air conditioner as in the above embodiments.

The storage medium may be a flash memory, a hard disk, a multimedia card, a card memory (e.g., SD or DX memory, etc.), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, an optical disk, a server, an App application store, etc.

For the content of the method, please refer to the foregoing embodiment, and the description is omitted in this embodiment.

Example seven

On the basis of the above embodiment, the present embodiment provides a control apparatus 8, including a memory and one or more processors, on which a computer program is stored, which when executed by the one or more processors, implements the control method of the indirect evaporative cooling air conditioner of the above embodiment. For the content of the method, please refer to the foregoing embodiment, and the description is omitted in this embodiment.

The processor may be an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), digital signal processor (Digital Signal Processor, DSP), digital signal processing device (Digital Signal Processing Device, DSPD), programmable logic device (Programmable Logic Device, PLD), field programmable gate array (Field Programmable Gate Array, FPGA), controller, microcontroller, microprocessor or other electronic component implementation for performing the methods of the above embodiments. For the content of the method, please refer to the foregoing embodiment, and the description is omitted in this embodiment.

The Memory may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as static random access Memory (Static Random Access Memory, SRAM for short), electrically erasable programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM for short), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM for short), programmable Read-Only Memory (Programmable Read-Only Memory, PROM for short), read-Only Memory (ROM for short), magnetic Memory, flash Memory, magnetic disk, or optical disk.

Example eight

On the basis of the above embodiments, the present embodiment provides an indirect evaporative cooling air conditioner including the control device of the above embodiments.

In some embodiments, the indirect evaporative cooling air conditioner further comprises: the temperature sensing device is arranged at the primary air outlet, the secondary air inlet and/or the secondary air outlet, is connected with the control equipment and is used for collecting the dry bulb temperature of the primary air outlet, the wet bulb temperature of the secondary air inlet and the wet bulb temperature of the secondary air outlet.

In some implementations, as shown in fig. 2, the temperature sensing device may include: the secondary air inlet temperature and humidity sensor 5, the primary air outlet temperature and humidity sensor 7 and the secondary air outlet temperature and humidity sensor 6 are used for detecting the temperature and humidity of the secondary air inlet, the primary air outlet and the secondary air outlet. In some cases, the temperature and humidity sensor 5 at the primary air side outlet of the indirect evaporative cooling air conditioner may be a bulb.

The method comprises the steps of detecting a primary air side outlet dry bulb temperature t1 and a secondary air side outlet wet bulb enthalpy difference delta H (delta H=secondary air outlet enthalpy value-secondary air inlet enthalpy value), adjusting the operation frequencies of a primary air variable frequency fan, a secondary air variable frequency fan and a variable frequency spray water pump according to the range of the primary air side outlet dry bulb temperature t1 and the secondary air inlet enthalpy difference delta H, and changing the secondary air water-air ratio (secondary air side spray water volume to air volume ratio) and the primary air/secondary air ratio (primary air side air volume to secondary air side air volume ratio) in an air conditioning unit, so that the primary air outlet dry bulb temperature is controlled, and the air conditioning unit stably operates.

Under the condition that the temperature and the humidity of the ambient air are determined, the wet bulb temperature of the secondary air inlet is a fixed value, when the delta H is increased, the water evaporation quantity is also increased, and the dry bulb temperature of the primary air outlet is correspondingly reduced. The dry bulb temperature of the primary air outlet and the wet bulb temperature of the secondary air inlet and outlet have the optimal operation range when the air conditioning unit operates under different environments: a is more than or equal to t1 and less than or equal to B; c < Δh < E.

The details and beneficial effects of the technical features in this embodiment correspond to those of the foregoing embodiments, and are not described in detail in this embodiment.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus embodiments described above are merely illustrative, for example, of the flowcharts and block diagrams in the figures that illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

It should be noted that, in the present invention, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the inclusion of an element by the phrase "comprising one … …" does not exclude the presence of other elements in a process, method, article, or apparatus that comprises an element.

Although the embodiments of the present invention are described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is still subject to the scope of the appended claims.

Claims (8)

1. A control method of an indirect evaporative cooling air conditioner, characterized by comprising:

acquiring the dry bulb temperature of a primary air outlet, the wet bulb temperature of a secondary air inlet and the wet bulb temperature of a secondary air outlet of the indirect evaporative cooling air conditioner;

calculating a wet bulb enthalpy difference between the secondary air inlet and the secondary air outlet based on the secondary air inlet wet bulb temperature and the secondary air outlet wet bulb temperature;

adjusting the operation state of the indirect evaporative cooling air conditioner based on the primary air outlet dry bulb temperature and the wet bulb enthalpy difference to control the primary air outlet dry bulb temperature within a first target range and the wet bulb enthalpy difference within a second target range;

wherein, the adjusting the operation state of the indirect evaporative cooling air conditioner comprises: adjusting the operation frequency of the water pump, the operation frequency of the primary fan and/or the operation frequency of the secondary fan;

when the dry bulb temperature of the primary air outlet is smaller than the preset lower limit of the dry bulb temperature, the operation state of the indirect evaporative cooling air conditioner is adjusted based on the dry bulb temperature of the primary air outlet and the wet bulb enthalpy difference, and the method comprises the following steps:

if the wet-ball enthalpy difference is higher than a preset wet-ball enthalpy difference upper limit, reducing the running frequency of the water pump;

if the wet-ball enthalpy difference is between the preset wet-ball enthalpy difference upper limit and the preset wet-ball enthalpy difference intermediate value, reducing the operation frequency of the secondary fan;

and if the wet-ball enthalpy difference is lower than a preset wet-ball enthalpy difference intermediate value, increasing the operating frequency of the primary fan.

2. The method according to claim 1, wherein when the primary air outlet dry bulb temperature is between a preset dry bulb temperature lower limit and a preset dry bulb temperature upper limit, the adjusting the operation state of the indirect evaporative cooling air conditioner based on the primary air outlet dry bulb temperature and the wet bulb enthalpy difference comprises:

if the wet-ball enthalpy difference is lower than a preset wet-ball enthalpy difference lower limit, increasing the running frequency of the water pump;

and if the wet-ball enthalpy difference is higher than a preset wet-ball enthalpy difference upper limit, reducing the running frequency of the water pump.

3. The method according to claim 1, wherein when the primary air outlet dry bulb temperature is greater than a preset dry bulb temperature upper limit, the adjusting the operation state of the indirect evaporative cooling air conditioner based on the primary air outlet dry bulb temperature and the wet bulb enthalpy difference comprises:

if the wet-ball enthalpy difference is lower than a preset wet-ball enthalpy difference lower limit, increasing the running frequency of the water pump;

if the wet-ball enthalpy difference is higher than a preset wet-ball enthalpy difference upper limit, the operation frequency of the secondary fan is increased;

if the wet-ball enthalpy difference is between the preset wet-ball enthalpy difference upper limit and the preset wet-ball enthalpy difference intermediate value, increasing the operation frequency of the water pump and the operation frequency of the secondary fan;

and if the wet-ball enthalpy difference is between the preset wet-ball enthalpy difference lower limit and the preset wet-ball enthalpy difference intermediate value, reducing the operation frequency of the primary fan.

4. A control device of an indirect evaporative cooling air conditioner, applied to the control method of an indirect evaporative cooling air conditioner according to any one of claims 1 to 3, characterized by comprising:

the acquisition module is used for acquiring the dry bulb temperature of the primary air outlet, the wet bulb temperature of the secondary air inlet and the wet bulb temperature of the secondary air outlet of the indirect evaporative cooling air conditioner;

the calculating module is used for calculating the wet bulb enthalpy difference between the secondary air inlet and the secondary air outlet based on the secondary air inlet wet bulb temperature and the secondary air outlet wet bulb temperature;

and the adjusting module is used for adjusting the running state of the indirect evaporative cooling air conditioner based on the dry bulb temperature of the primary air outlet and the wet bulb enthalpy difference so as to control the dry bulb temperature of the primary air outlet within a first target range and control the wet bulb enthalpy difference within a second target range.

5. A storage medium having stored thereon a computer program which, when executed by one or more processors, implements the control method of an indirect evaporative cooling air conditioner according to any one of claims 1 to 3.

6. A control apparatus comprising a memory and one or more processors, the memory having stored thereon a computer program which, when executed by the one or more processors, implements the control method of the indirect evaporative cooling air conditioner as claimed in any one of claims 1 to 3.

7. An indirect evaporative cooling air conditioner comprising the control device of claim 6.

8. The indirect evaporative cooling air conditioner of claim 7, further comprising:

the temperature sensing device is arranged at the primary air outlet, the secondary air inlet and/or the secondary air outlet, is connected with the control equipment and is used for collecting the dry bulb temperature of the primary air outlet, the wet bulb temperature of the secondary air inlet and the wet bulb temperature of the secondary air outlet.

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