CN110749049A - Control method of water-cooled air conditioning unit - Google Patents
Control method of water-cooled air conditioning unit Download PDFInfo
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- CN110749049A CN110749049A CN201810727859.0A CN201810727859A CN110749049A CN 110749049 A CN110749049 A CN 110749049A CN 201810727859 A CN201810727859 A CN 201810727859A CN 110749049 A CN110749049 A CN 110749049A
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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
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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
- F24F2110/00—Control inputs relating to air properties
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Abstract
The invention relates to the technical field of air conditioners, in particular to a control method of a water-cooled air conditioning unit. The invention aims to solve the problem of low cleaning efficiency of the existing water-cooled air conditioning unit. To this end, the control method of the water-cooled air conditioning unit of the present invention includes: acquiring the outlet water temperature of the heat exchange liquid circulating system and the pressure of a refrigerant in a heat exchanger exchanging heat with the heat exchange liquid circulating system during phase change; acquiring corresponding saturation temperature according to the pressure, and calculating a first difference between the water temperature and the saturation temperature; comparing the first difference value with a set threshold value; and selectively controlling the water-cooled air conditioning unit to automatically clean the heat exchanger or send a cleaning prompt according to the comparison result. The control method of the water-cooled air conditioning unit greatly reduces the probability of the fault of the compressor and further improves the safety performance of the water-cooled air conditioning unit.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of a water-cooled air conditioning unit.
Background
With the development and progress of technology, more and more commercial air conditioning units are developed and applied to large-scale places such as shopping malls and office buildings, and a water-cooled air conditioning unit is one of the air conditioning units. The water-cooled air conditioning unit generally includes a refrigerant circulation system and a heat exchange fluid circulation system. The refrigerant circulating system mainly comprises two heat exchangers, and the circulation is completed by the change of the refrigerant in the gas state and the liquid state in the two heat exchangers. At least one of the two heat exchangers is connected with a heat exchange liquid circulating system, and the purpose of changing temperature can be achieved by the heat exchange liquid in a heat exchange mode with the refrigerant in the heat exchanger when the heat exchange liquid passes through the heat exchanger, such as absorbing heat released by the refrigerant or absorbing heat from the heat exchange liquid by the refrigerant. The other heat exchanger is provided with a fan or is connected with the other heat exchange liquid circulating system to realize opposite heat exchange.
In the actual operation of the water-cooled air conditioning unit, the heat exchange effect of the heat exchanger is always in the process of reduction due to the influence of installation level, local water quality, air environment, scaling and other factors. Along with the continuous scale deposit of the heat exchanger that links to each other with the cooling water set, the heat transfer effect worsens gradually, consequently needs clear up as early as possible to guarantee the heat transfer effect of heat exchanger, make the unit be in the operation stage of high efficiency energy-conservation always.
In the existing control method, the heat exchange effect of the heat exchanger is ensured mainly by manual judgment or periodic cleaning of the heat exchanger. Although the scaling phenomenon of the heat exchanger is relieved to a certain extent by the method, obviously, the cleaning efficiency of the method is low, the heat exchanger cannot be cleaned in time, the comfort level of a user is affected, and the heat exchanger is damaged to a certain extent. And, when the cleaning frequency is too high, the cleaning cost is increased.
Accordingly, there is a need in the art for a new control method of a water-cooled air conditioning unit to solve the above problems.
Disclosure of Invention
In order to solve the above-mentioned problems in the prior art, that is, to solve the problem of low cleaning efficiency of the existing water-cooled air conditioning unit, the present invention provides a water-cooled air conditioning unit, which includes a refrigerant circulation system and a heat exchange liquid circulation system, wherein the heat exchange liquid circulation system can exchange heat with a heat exchanger of the refrigerant circulation system, and the control method includes:
acquiring the outlet water temperature of a heat exchange liquid circulating system and the pressure of a refrigerant in a heat exchanger exchanging heat with the heat exchange liquid circulating system during phase change;
acquiring a corresponding saturation temperature according to the pressure, and calculating a first difference value between the water outlet temperature and the saturation temperature;
comparing the first difference value with a set threshold value;
and selectively controlling the water-cooled air conditioning unit to automatically clean the heat exchanger or send a cleaning prompt according to the comparison result.
In a preferred technical solution of the control method of the water-cooled air conditioning unit, the heat exchanger is an evaporator and/or a condenser, the pressure is correspondingly an evaporation pressure and/or a condensation pressure, the saturation temperature is correspondingly an evaporation saturation temperature and/or a condensation saturation temperature, and correspondingly, the step of "calculating a first difference between the outlet water temperature and the saturation temperature" specifically includes:
calculating a first sub-difference value between the water outlet temperature and the saturated evaporation temperature; and/or
And calculating a second sub-difference value between the saturated condensing temperature and the outlet water temperature.
In a preferred embodiment of the above method for controlling a water-cooled air conditioning unit, "selectively controlling the water-cooled air conditioning unit to perform automatic cleaning of a heat exchanger or issue a cleaning reminder according to the comparison result" specifically includes:
when the first sub-difference value is larger than or equal to a first set threshold value, controlling the water-cooled air conditioning unit to automatically clean the heat exchanger or sending a cleaning prompt; and/or when the second sub-difference value is larger than or equal to a second set threshold value, controlling the water-cooled air conditioning unit to automatically clean the heat exchanger or sending a cleaning prompt.
In a preferred embodiment of the method for controlling a water-cooled air conditioning unit, the step of obtaining the corresponding saturation temperature according to the pressure specifically includes:
calculating the saturation temperature according to a set formula; or determining the saturation temperature according to the corresponding relation between the pressure and the saturation temperature.
In a preferred embodiment of the above method for controlling a water-cooled air conditioning unit, before the step of selectively controlling the water-cooled air conditioning unit to perform automatic cleaning of a heat exchanger or issue a cleaning reminder according to the comparison result, the method further includes:
judging whether the water-cooled air conditioning unit is in a stable state;
and when the water-cooled air conditioning unit is in a stable state, continuously executing the control method of the water-cooled air conditioning unit.
In a preferred embodiment of the method for controlling a water-cooled air conditioning unit, the steady state includes:
the starting time of the water-cooled air conditioning unit is greater than or equal to the set time; and/or the water-cooled air conditioning unit is not in a defrosting mode state; and/or the water temperature change rate of the water-cooled air conditioning unit is smaller than the set change rate.
In a preferred embodiment of the above method for controlling a water-cooled air conditioning unit, after the step of "controlling the water-cooled air conditioning unit to perform automatic cleaning of a heat exchanger or sending a cleaning reminder", the method further includes:
obtaining the temperature of the outlet water of the heat exchange liquid circulating system and the pressure of the refrigerant in the heat exchanger during phase change again;
acquiring a corresponding saturation temperature according to the pressure, and calculating a second difference value between the water outlet temperature and the saturation temperature;
comparing the second difference value with the set threshold value;
and selectively adjusting the set water temperature of the heat exchange liquid circulating system according to the comparison result.
In a preferred technical solution of the control method of the water-cooled air conditioning unit, the step of "calculating a second difference between the outlet water temperature and the saturation temperature" specifically includes:
calculating a third sub-difference value between the water outlet temperature and the saturated evaporation temperature; and/or calculating a fourth sub-difference between the saturated condensing temperature and the outlet water temperature.
In a preferred embodiment of the method for controlling a water-cooled air conditioning unit, the step of selectively adjusting the set temperature of the water temperature of the heat exchange fluid circulation system according to the comparison result specifically includes:
and when the third sub-difference value is larger than or equal to a third set threshold value and/or the fourth sub-difference value is larger than or equal to a fourth set threshold value, adjusting the set water temperature of the heat exchange liquid circulation system.
In a preferred embodiment of the method for controlling a water-cooled air conditioning unit, the step of "adjusting the set temperature of the water temperature of the heat exchange fluid circulation system" includes:
and adjusting the set water temperature according to the pressure protection value of the evaporator and/or the condenser.
As can be understood by those skilled in the art, in the above preferred embodiment, the control method of the water-cooled air conditioning unit includes: acquiring the outlet water temperature of the heat exchange liquid circulating system and the pressure of a refrigerant in a heat exchanger exchanging heat with the heat exchange liquid circulating system during phase change; acquiring corresponding saturation temperature according to the pressure, and calculating a first difference between the water temperature and the saturation temperature; comparing the first difference value with a set threshold value; and selectively controlling the water-cooled air conditioning unit to automatically clean the heat exchanger or send a cleaning prompt according to the comparison result.
The control method of the water-cooled air conditioning unit can judge whether the heat exchanger needs to be descaled by utilizing the heat exchange characteristics of the heat exchanger, has simple, effective, accurate and convenient steps, avoids the problems of inaccuracy of manual judgment and low cleaning efficiency of regularly cleaning the heat exchanger, greatly reduces the fault probability of a compressor and the cleaning and maintenance cost, and improves the safety performance of the water-cooled air conditioning unit. In other words, the invention solves the problem of low cleaning efficiency of the existing water-cooled air conditioning unit, improves the user experience, and is suitable for large-scale popularization because the method can be realized only based on the existing detection element without adding a new detection element.
Drawings
The control method of the water-cooled air conditioning unit according to the present invention will be described with reference to the accompanying drawings in conjunction with the connection of the condenser and the heat exchange fluid circulation system in the water-cooled air conditioning unit. In the drawings:
FIG. 1 is a flow chart illustrating a method for controlling a water-cooled air conditioning unit according to the present invention;
fig. 2 is a schematic diagram illustrating one embodiment of a method for controlling a water-cooled air conditioning unit according to the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, in fig. 2, it is determined whether the air conditioning unit is in a steady state although it is determined at the determination Tc-TwoThe step of determining whether the heat exchanger is in the normal state is carried out after the step of determining whether the heat exchanger is in the normal state > 8, but the steady state determining step is carried out before the step of controlling the heat exchanger to automatically clean or sending a cleaning prompt, namely before the detecting step.
First, referring to fig. 1, a method for controlling a water-cooled air conditioning unit according to the present invention will be described. Fig. 1 is a flowchart illustrating a method for controlling a water-cooled air conditioning unit according to the present invention.
As shown in fig. 1, in order to solve the problem of low cleaning efficiency of the existing water-cooled air conditioning unit, the present invention provides a control method of a water-cooled air conditioning unit, the water-cooled air conditioning unit includes a refrigerant circulation system and a heat exchange liquid circulation system, the heat exchange liquid circulation system can exchange heat with a heat exchanger of the refrigerant circulation system, the method mainly includes:
s100, acquiring a temperature of outlet water of the heat exchange liquid circulation system and a pressure of a refrigerant in a heat exchanger performing heat exchange with the heat exchange liquid circulation system during phase change, for example, acquiring a pressure (i.e., a condensing pressure and/or an evaporating pressure) of the refrigerant in the condenser and/or the evaporator during phase change and a temperature of the outlet water of the heat exchange liquid circulation system connected to the condenser and/or the evaporator, where the temperature of the outlet water refers to a temperature of the heat exchange liquid performing heat exchange with the condenser and/or the evaporator, and the heat exchange may be water or any other liquid capable of performing heat exchange;
s200, acquiring a corresponding saturation temperature according to the pressure, calculating a first difference between the water temperature and the saturation temperature, for example, acquiring a corresponding condensation saturation temperature and/or evaporation saturation temperature according to the condensation pressure and/or evaporation pressure, and calculating a first sub-difference between the water temperature and the evaporation saturation temperature and/or a second sub-difference between the condensation saturation temperature and the effluent temperature, wherein the first sub-difference and the second sub-difference are collectively referred to as a first difference;
s300, comparing the first difference value with a set threshold, for example, comparing the first sub-difference value with the first set threshold and/or comparing the second sub-difference value with the second set threshold, where the first set threshold and the second set threshold are collectively referred to as the set threshold;
s400, selectively controlling the water-cooled air conditioning unit to automatically clean the heat exchanger or sending a cleaning prompt according to the comparison result, for example, if the first difference is greater than a set threshold, controlling the heat exchanger to automatically clean the heat exchanger by the air conditioning unit, and if the first difference is greater than the set threshold, automatically cleaning the heat exchanger by means of defrosting and redissolving the air conditioning evaporator; or sending a cleaning reminder to the user, such as an audible and visual reminder or a text reminder;
s500, acquiring and calculating again, and selectively adjusting the water temperature set temperature of the heat exchange liquid circulating system according to the comparison result, for example, acquiring the outlet water temperature of the heat exchange liquid circulating system again and the condensation pressure and/or the evaporation pressure of the refrigerant in the heat exchanger during phase change; and acquiring the corresponding condensation saturation temperature and/or evaporation saturation temperature again according to the pressure, calculating a third sub-difference value of the water temperature and the evaporation saturation temperature and/or a fourth sub-difference value of the condensation saturation temperature and the outlet water temperature (similarly, collectively referred to as a second difference value), and if the second difference value is still larger than a set threshold value, adjusting the set water temperature upwards or downwards. Wherein the water temperature setting temperature is a target outlet water temperature set by a user.
According to the scheme, the water temperature and the pressure of the refrigerant during phase change are obtained, the saturation temperature is obtained according to the phase change pressure, then the difference value between the water temperature and the saturation temperature is calculated, automatic descaling or descaling reminding is carried out according to the comparison result of the difference value and the set threshold, the steps are repeated again after descaling, and the water temperature is selectively adjusted according to the comparison result; and the detection is carried out again after the cleaning, whether the descaling is carried out or not and the descaling effect can be detected, and the water temperature set temperature is adjusted in time under the condition of poor descaling effect or no descaling, so that the fault probability of the compressor is greatly reduced, and the safety performance of the water-cooled air conditioning unit is further improved.
It should be noted that the heat exchange liquid circulating system can be connected with a condenser in the air conditioning unit for heat exchange, and the outlet water temperature of the heat exchange liquid is increased compared with the inlet water temperature; the heat exchange liquid circulating system can also be connected with the evaporator for heat exchange, and the temperature of outlet water is reduced compared with the temperature of inlet water; of course, the heat exchange fluid circulation system may be connected to the evaporator and the condenser, respectively.
The method for controlling the water-cooled air conditioning unit according to the present invention will be described in detail with reference to fig. 1 and 2, in conjunction with an example in which the heat exchange fluid circulation system is connected to the condenser. Fig. 2 is a schematic diagram illustrating one embodiment of a method for controlling a water-cooled air conditioning unit according to the present invention.
As shown in fig. 1 and fig. 2, in a preferred embodiment, step S100 specifically includes:
and acquiring the outlet water temperature of the heat exchange system and the condensing pressure of the condenser. For example, the outlet water temperature is directly obtained from an outlet water temperature sensor of the heat exchange liquid circulating system, and the condensing pressure is directly obtained from a pressure gauge arranged on a condensing pipeline. Of course, it is conceivable to those skilled in the art that the elements for measuring the water temperature and the condensing pressure may be newly installed on the heat exchange liquid circulation system and the refrigerant circulation system to form a separate system for easy control and operation. If the air conditioner is used, the outlet water temperature and the condensing pressure are directly obtained from the air conditioner unit, other elements do not need to be installed, the existing structure does not need to be modified, and cost and time are saved.
After acquiring the temperature and the condensation pressure, in a possible embodiment, step S200 specifically comprises:
and acquiring the corresponding condensation saturation temperature according to the condensation pressure, and calculating a second sub-difference value between the condensation saturation temperature and the water outlet temperature. For example, the condensation saturation temperature corresponding to the current condensation pressure is found according to the corresponding relation between the condensation pressure and the condensation saturation temperature by referring to the table. And subtracting the outlet water temperature value from the obtained condensation saturation temperature value to obtain a second sub-difference value of the condensation saturation temperature and the outlet water temperature. The condensing saturation temperature is obtained according to the condensing pressure, and the difference value of the condensing saturation temperature is calculated, so that the method belongs to a simple operation method, and has the advantages of convenience, rapidness and effectiveness.
After calculating the difference between the condensation saturation temperature and the outlet water temperature, in a possible implementation manner, the step S300 specifically includes:
and comparing the second sub-difference value of the condensation saturation temperature and the outlet water temperature with the first set threshold value. The setting of the first set threshold value may be determined when the water-cooled air conditioning unit leaves a factory, or may be reset according to the operation aging condition of the compressor after the water-cooled air conditioning unit operates for a period of time. The first set threshold value is preferably 8 c in the present invention, but is not limited thereto, and those skilled in the art can select it according to the model and operation state of the compressor, for example, 6 c, 7 c, 9 c, etc.
After comparing the second sub-difference with the first set threshold, in a possible implementation, the step S400 specifically includes:
and selectively controlling the water-cooled air conditioning unit to automatically clean the heat exchanger or send a cleaning prompt according to the comparison result. For example, if the second sub-difference value between the condensation saturation temperature and the outlet water temperature is greater than the first set threshold value, it is proved that the heat exchange effect is poor due to scaling and the like, the heat exchanger needs to be cleaned in time, and the heat exchanger can start the automatic cleaning function of the heat exchanger or send a cleaning prompt to a user; if the second sub-difference value between the condensation saturation temperature and the water outlet temperature is smaller than the first set threshold value, the heat exchange effect is better, cleaning is not needed, the water outlet temperature and the condensation pressure are obtained again, the steps are repeated, the air conditioner set is monitored, and the detection can be carried out after the operation for a period of time. For example, the interval time between the two detections may be set by an operator of the water-cooled air conditioning unit.
In a preferred embodiment, before the heat exchanger is controlled to automatically clean or send out a cleaning prompt, whether the air conditioning unit is in a stable state or not can be judged, so that the misreport of the judgment result caused by the fact that the air conditioning unit is just started and is not in the stable state is avoided. If the unit is in a stable state, the subsequent steps are continuously executed, and if the unit is in an unstable state, the water outlet temperature and the condensing pressure are obtained again or all parameters of the system are detected again after the unit is operated for a period of time. Wherein the steady state comprises: the starting time of the water-cooled air conditioning unit is greater than or equal to the set time, for example, the set time is 5 minutes; the water-cooled air conditioning unit is not in a defrosting mode; the water temperature change rate of the water-cooled air conditioning unit is smaller than the set change rate, for example, the set change rate is 1 ℃/2 min. The air conditioning unit can continue to execute the next step only if all the conditions of the steady state are met.
Of course, those skilled in the art may add other steady-state conditions affecting the normal operation of the heat exchanger according to the operation condition of the air conditioning unit, for example, the outdoor fan is not in a low performance state, such as a low rotation speed of the outdoor fan due to a fault. The step of judging whether the air conditioning unit is in a stable state is executed before the heat exchanger is controlled to automatically clean or send a cleaning prompt, namely the step can be arranged before the temperature of the taken water is obtained, after the temperature of the taken water is obtained and before the condensation saturation temperature is calculated, after the second sub-difference value of the condensation saturation temperature and the temperature of the taken water is compared with the set threshold value, before the heat exchanger is controlled to automatically clean or send the cleaning prompt and the like. Of course, the number of times of steady state determination is not limited, and multiple detections may be performed, or detections may be performed at any time.
After the condenser is cleaned, in a possible implementation, step S500 specifically includes:
and acquiring the water outlet temperature and the condensation pressure of the heat exchange liquid circulating system again, acquiring the condensation saturation temperature according to the condensation pressure, calculating a fourth sub-difference value of the condensation saturation temperature and the water outlet temperature, comparing the fourth sub-difference value with a fourth set threshold value, and selectively adjusting the water temperature set temperature of the heat exchange liquid circulating system according to the comparison result. The fourth set threshold may be equal to the second set threshold, or may be set to any value smaller than the second set threshold. For example, the fourth sub-difference is greater than the fourth set threshold, which proves that although the heat exchanger is cleaned, the cleaning effect is not ideal; or the user does not clean the heat exchanger, and the scaling phenomenon still exists. At the moment, the set can adjust the water temperature to the set temperature downwards so as to avoid system faults caused by phenomena such as overload of the compressor and the like. Specifically, 1 °, 2 °, 3 °, 4 °, etc. can be adjusted downward; if the fourth sub-difference is smaller than the fourth set threshold, it is proved that the heat exchange effect of the cleaned heat exchanger has reached a better state, and at this time, the method is executed from the beginning or after running for a period of time.
When the water temperature is adjusted downwards, the adjustment is made according to the pressure protection value of the condenser, i.e. the maximum pressure of the condenser is lower than the condenser pressure protection value, e.g. PHeight of≤Pd1-0.1, wherein PHeight ofPressure of the condenser after setting the temperature for regulating the water temperature, Pd1Is the condenser pressure protection value.
The steady state determination may be performed in step S500, and may be performed before the water temperature setting temperature is adjusted. In addition, the control method of the water-cooled air conditioning unit of the present invention can omit the step S500, and can still achieve the final purpose of descaling when the step S500 is omitted.
The advantages of the preferred embodiment described above are: when the heat exchanger is not smooth in scaling operation, early warning or automatic cleaning can be carried out in advance, inaccuracy in manual subjective judgment is eliminated, damage to a compressor or overload operation condition caused by scaling of the heat exchanger is fully avoided, and the fault rate of a unit is reduced; and after the cleaning is finished, the operation data is obtained again and judged, and the water temperature set temperature is adjusted in time when the descaling effect is poor or the descaling is not performed, so that double-layer guarantee is provided for the operation safety of the water-cooled air conditioning unit.
The operation flow of the method for controlling the water-cooled air conditioning unit according to the present invention will be briefly described with reference to fig. 2.
As shown in fig. 2, the condenser condensing pressure P is detecteddAnd the temperature T of the outlet waterwo→ obtaining the condensing pressure P of the condenserdCorresponding condensation saturation temperature Tc→ judgment of Tc-TwoIf the judgment result is more than 8, the next step is carried out, if not, the step returns to the redetection → the judgment is carried out whether the air conditioning unit is in the stable state, if yes, the step is carried out, otherwise, the step returns to the redetection → the automatic cleaning of the condenser or the sending of the cleaning prompt → the step of repeated detection and calculation → the judgment Tc-TwoIf the temperature is more than 8, adjusting the set water temperature downwards by 2 degrees if the temperature is more than 8, otherwise, detecting again.
Finally, it should be noted that although the above embodiments are described by taking a condenser as an example, this is only used to illustrate the principle of the present invention, and is not intended to limit the protection scope of the present invention, it is obvious to those skilled in the art that the control method of the water-cooled air conditioning unit of the present invention can be applied to the evaporator of the air conditioning unit to ensure that the compressor does not have damage or overload operation due to the fouling phenomenon of the heat exchanger. When the method is applied to an evaporator, whether a first sub-difference value obtained by subtracting evaporation saturation temperature from outlet water temperature of the heat exchange liquid circulating system is larger than a first set threshold value or not is judged, data is obtained again after cleaning is finished, whether a third sub-difference value is larger than a third set threshold value or not is judged again, and if the third sub-difference value is larger than the third set threshold value, the water temperature set temperature is adjusted upwards according to a pressure protection value of the evaporator, for example, PIs low in≥Pd2+ 0.1; wherein, PIs low inPressure of evaporator after setting temperature for regulating water temperature, Pd2Is the evaporator pressure protection value.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A control method of a water-cooled air conditioning unit, the water-cooled air conditioning unit comprising a refrigerant circulation system and a heat exchange liquid circulation system, the heat exchange liquid circulation system being capable of exchanging heat with a heat exchanger of the refrigerant circulation system, the control method comprising:
acquiring the outlet water temperature of a heat exchange liquid circulating system and the pressure of a refrigerant in a heat exchanger exchanging heat with the heat exchange liquid circulating system during phase change;
acquiring a corresponding saturation temperature according to the pressure, and calculating a first difference value between the water outlet temperature and the saturation temperature;
comparing the first difference value with a set threshold value;
and selectively controlling the water-cooled air conditioning unit to automatically clean the heat exchanger or send a cleaning prompt according to the comparison result.
2. The control method of the water-cooled air conditioning unit according to claim 1, wherein the heat exchanger is an evaporator and/or a condenser, the pressure is correspondingly an evaporation pressure and/or a condensation pressure, the saturation temperature is correspondingly an evaporation saturation temperature and/or a condensation saturation temperature, and correspondingly, the step of "calculating the first difference between the outlet water temperature and the saturation temperature" is specifically:
calculating a first sub-difference value between the water outlet temperature and the saturated evaporation temperature; and/or
And calculating a second sub-difference value between the saturated condensing temperature and the outlet water temperature.
3. The method for controlling a water-cooled air conditioning unit according to claim 2, wherein the step of selectively controlling the water-cooled air conditioning unit to perform automatic cleaning of the heat exchanger or issue a cleaning reminder according to the comparison result specifically comprises:
when the first sub-difference value is larger than or equal to a first set threshold value, controlling the water-cooled air conditioning unit to automatically clean the heat exchanger or sending a cleaning prompt; and/or the like and/or,
and when the second sub-difference value is larger than or equal to a second set threshold value, controlling the water-cooled air conditioning unit to automatically clean the heat exchanger or sending a cleaning prompt.
4. The method for controlling a water-cooled air conditioning unit according to claim 1, wherein the step of obtaining the corresponding saturation temperature according to the pressure specifically comprises:
calculating the saturation temperature according to a set formula; or
And determining the saturation temperature according to the corresponding relation between the pressure and the saturation temperature.
5. The method for controlling a water-cooled air conditioning unit according to claim 1, wherein before the step of selectively controlling the water-cooled air conditioning unit to perform automatic cleaning of the heat exchanger or issue a cleaning reminder according to the comparison result, the method further comprises:
judging whether the water-cooled air conditioning unit is in a stable state;
and when the water-cooled air conditioning unit is in a stable state, continuously executing the control method of the water-cooled air conditioning unit.
6. The control method of the water-cooled air conditioning unit according to claim 5, wherein the steady state includes:
the starting time of the water-cooled air conditioning unit is greater than or equal to the set time; and/or
The water-cooled air conditioning unit is not in a defrosting mode state; and/or
And the water temperature change rate of the water-cooled air conditioning unit is smaller than the set change rate.
7. The control method of the water-cooled air conditioning unit according to any one of claims 1 to 6, wherein after the step of "controlling the water-cooled air conditioning unit to perform automatic cleaning of the heat exchanger or issuing a cleaning reminder", the control method further comprises:
obtaining the temperature of the outlet water of the heat exchange liquid circulating system and the pressure of the refrigerant in the heat exchanger during phase change again;
acquiring a corresponding saturation temperature according to the pressure, and calculating a second difference value between the water outlet temperature and the saturation temperature;
comparing the second difference value with the set threshold value;
and selectively adjusting the set water temperature of the heat exchange liquid circulating system according to the comparison result.
8. The control method of the water-cooled air conditioning unit according to claim 7 when dependent on any one of claims 2 to 6, wherein the step of calculating the second difference between the outlet water temperature and the saturation temperature specifically comprises:
calculating a third sub-difference value between the water outlet temperature and the saturated evaporation temperature; and/or
And calculating a fourth sub-difference value between the saturated condensing temperature and the outlet water temperature.
9. The method for controlling a water-cooled air conditioning unit according to claim 8, wherein the step of selectively adjusting the set temperature of the water temperature of the heat exchange fluid circulation system according to the comparison result specifically comprises:
and when the third sub-difference value is larger than or equal to a third set threshold value and/or the fourth sub-difference value is larger than or equal to a fourth set threshold value, adjusting the set water temperature of the heat exchange liquid circulation system.
10. The method for controlling a water-cooled air conditioning unit according to claim 9, wherein the step of adjusting the set temperature of the water temperature of the heat exchange fluid circulation system specifically comprises:
and adjusting the set water temperature according to the pressure protection value of the evaporator and/or the condenser.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113390161A (en) * | 2020-03-12 | 2021-09-14 | 青岛海尔空调电子有限公司 | Air-cooled heat pump hot water air conditioning unit and control method thereof |
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| CN115273429A (en) * | 2022-07-29 | 2022-11-01 | 呼伦贝尔安泰热电有限责任公司海拉尔热电厂 | Plate heat exchanger blockage early warning method, system, equipment and storage medium |
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