CN115727479A - Defrosting judgment method based on Internet of things and air conditioning unit - Google Patents
Defrosting judgment method based on Internet of things and air conditioning unit Download PDFInfo
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- CN115727479A CN115727479A CN202211485947.7A CN202211485947A CN115727479A CN 115727479 A CN115727479 A CN 115727479A CN 202211485947 A CN202211485947 A CN 202211485947A CN 115727479 A CN115727479 A CN 115727479A
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Abstract
The invention discloses a defrosting judgment method based on the Internet of things and an air conditioning unit, wherein the defrosting judgment method comprises the following steps: detecting working parameters of an outdoor heat exchanger when the air conditioning unit is in a heating mode; judging whether the outdoor heat exchanger meets the frosting condition or not according to the working parameters; if yes, judging whether the outdoor heat exchanger frosts according to the Internet of things, and starting a defrosting program when judging that the outdoor heat exchanger frosts. Compared with the prior art, the invention judges whether the outdoor heat exchanger frosts by combining the internet of things, and executes the defrosting program, thereby improving the accuracy of judging defrosting by the system, realizing defrosting with frost and defrosting without frost, and reducing the influence on the indoor air temperature when the air conditioning unit frosts.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to a defrosting judgment method based on the Internet of things and an air conditioning unit.
Background
At present, most manufacturers judge whether frosting occurs according to the pipe temperature of the outdoor heat exchanger in the fixed defrosting period under the condition of low environmental temperature, but the outdoor heat exchanger does not always frost under the condition of low air humidity under the actual low-temperature working condition, and misjudgment is caused and the defrosting times are increased if judgment is only carried out according to the pipe temperature. In defrosting, a heating cycle is generally switched to a cooling cycle, a compressor is used as a heat source, and a high-temperature gas refrigerant from the compressor flows into an outdoor heat exchanger for defrosting, so that the indoor temperature is greatly reduced, the time required for the room temperature to reach a set temperature is prolonged, and the comfort of a user is greatly reduced.
Therefore, how to design a defrosting judgment method based on the internet of things and an air conditioning unit, which can improve the accuracy of judging frosting by a system, is an urgent technical problem to be solved in the industry.
Disclosure of Invention
The invention provides a defrosting judgment method based on the Internet of things and an air conditioning unit, and aims to solve the problem that in the prior art, the accuracy of judging the frosting of an outdoor heat exchanger by a system is poor.
The invention provides a defrosting judgment method based on the Internet of things, which comprises the following steps:
detecting working parameters of an outdoor heat exchanger when the air conditioning unit is in a heating mode;
judging whether the outdoor heat exchanger meets the frosting condition or not according to the working parameters;
if yes, judging whether the outdoor heat exchanger frosts according to the Internet of things, and starting a defrosting program when judging that the outdoor heat exchanger frosts.
Further, judge according to the thing networking whether outdoor heat exchanger frosts, include:
acquiring defrosting time of a plurality of air conditioning units nearby the current air conditioning unit;
recording the air conditioning units with the defrosting time length longer than a first preset time length, and judging whether the number of the air conditioning units with the defrosting time length longer than the first preset time length reaches half of all the air conditioning units or not;
if yes, the outdoor heat exchanger is judged to be frosted, otherwise, the outdoor heat exchanger is judged not to be frosted.
Further, the operating parameters include a tube temperature of the outdoor heat exchanger and a pressure of the economizer.
Further, judging whether the outdoor heat exchanger meets the frosting condition according to the working parameters, and the method comprises the following steps:
judging whether the tube temperature of the outdoor heat exchanger is lower than a preset temperature or not;
if yes, detecting the duration that the tube temperature of the outdoor heat exchanger is lower than the preset temperature, and judging that the outdoor heat exchanger meets the frosting condition when the duration is longer than a second preset duration.
Further, before determining that the outdoor heat exchanger satisfies the frosting condition, the method further includes:
judging whether the pressure of the economizer is in a preset pressure range or not, and if so, judging that the outdoor heat exchanger meets the frosting condition;
if not, the user can not select the specific application, it is determined again whether the tube temperature of the outdoor heat exchanger is lower than a preset temperature.
Further, before detecting the working parameters of the outdoor heat exchanger, the method further comprises the following steps: and presetting the preset temperature, the preset pressure range and a second preset time according to the frosting condition of the outdoor heat exchanger.
Further, after the defrosting program is started, whether the air conditioning unit meets a defrosting stopping condition or not is detected, if yes, defrosting is stopped, and the frosting condition is returned to be judged.
Further, the preset temperature is-4 ℃, the preset pressure range is 250-400 kpa, and the second preset time is 5min.
Further, the first preset time is 1.5min.
The invention also provides an air conditioning unit which is provided with the defrosting judgment method.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the invention, on the basis of the traditional frosting judgment logic, the process of analyzing and judging the Internet of things is additionally added, the accuracy of judging frosting by the system is improved, frosting is realized, frosting is not generated, the influence on the indoor air temperature when the air conditioning unit is frosted is reduced, and the comfort level for the user and the heating effect of the air conditioner are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow chart of a defrosting judgment method according to the present invention;
fig. 2 is a control flow chart of the whole system.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the invention, and does not imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
The existing method for judging whether the outdoor heat exchanger frosts by the air conditioning unit is judged by the temperature of the tube of the outdoor heat exchanger, but under the condition of low air humidity, when the temperature of the tube of the outdoor heat exchanger is lower than the preset temperature, the outdoor heat exchanger does not frost. Therefore, the current frost judgment mode is easy to cause misjudgment, so that the defrosting times of the air conditioning unit are increased, the heating cycle of the air conditioning unit is generally required to be switched to the refrigerating cycle during defrosting, and the compressor is used as a heat source. Aiming at the problems, the idea of the invention is that the Internet of things analysis and judgment is additionally added on the basis of the traditional frosting judgment logic, the accuracy of frosting judgment is improved, the effects of frosting and frost-free defrosting are achieved, and the using comfort level of a user is improved.
Referring to fig. 2, the defrosting determination method provided by the present invention includes:
detecting working parameters of an outdoor heat exchanger when the air conditioning unit is in a heating mode;
judging whether the outdoor heat exchanger meets the frosting condition or not according to the working parameters;
if yes, judging whether the outdoor heat exchanger frosts according to the Internet of things, and starting a defrosting program when judging that the outdoor heat exchanger frosts.
According to the defrosting judgment method, the working parameters of the outdoor heat exchanger are only used for judging whether the outdoor heat exchanger meets the frosting condition or not, and whether the specific outdoor heat exchanger is frosted or not, and further judgment needs to be carried out according to the Internet of things, so that the accuracy of frosting judgment is improved.
Here, the judgment logic of the internet of things is only executed when the outdoor heat exchanger meets the frosting condition, the calculation time of the system can be saved, if the frosting judgment of the outdoor heat exchanger is totally based on the judgment of the internet of things, the real-time operation of the internet of things needs to be ensured, the frosting judgment is carried out, and the calculation pressure of the internet of things is greatly increased. In addition, the defrosting judgment method is only carried out when the air conditioning unit is in the heating mode, and because the external environment temperature is generally higher when the air conditioning unit is in the cooling mode, the frosting phenomenon cannot occur, therefore, the whole judgment logic can be arranged when the air conditioning unit is in the heating mode, the detection time of the air conditioning unit can be reduced, and unnecessary operation logic is saved.
Further, the action of judging whether the outdoor heat exchanger frosts according to the internet of things comprises the following steps:
acquiring defrosting time of a plurality of air conditioning units nearby the current air conditioning unit;
recording the air conditioning units with the defrosting time length longer than a first preset time length, and judging whether the number of the air conditioning units with the defrosting time length longer than the first preset time length reaches half of all the air conditioning units or not;
if yes, the outdoor heat exchanger is judged to be frosted, otherwise, the outdoor heat exchanger is judged not to be frosted.
Therefore, in the judgment logic of the Internet of things, the defrosting conditions of the air conditioning units are combined for analysis, and the accuracy of judging the frosting of the outdoor heat exchanger is greatly improved. In the invention, the condition for judging whether the outdoor heat exchanger frosts is not as follows: whether the number of the air conditioning units with the defrosting time length longer than the first preset time length reaches half of all the air conditioning units or not. Here, the first preset time is used for determining whether other air conditioning units enter a defrosting mode, and if more than half of the other surrounding air conditioning units enter the defrosting mode, it can be determined with greater accuracy that the outdoor heat exchanger has a frosting phenomenon, and a defrosting procedure can be performed.
In the invention, in order to improve the judgment precision of the Internet of things, a plurality of air conditioning units near the current air conditioning unit are only selected, and if the air conditioning unit with a longer distance is selected, the environment where the current air conditioning unit and other air conditioning units are located is different due to the fact that the distance is too far, so that the judgment accuracy of the Internet of things is influenced. The air conditioning unit is preferably within 1.5 kilometers of the current air conditioning unit, whether the outdoor heat exchanger frosts or not is further judged by comprehensively planning the defrosting conditions of the plurality of air conditioning units, and the accuracy of frosting judgment is greatly improved.
Specifically, the first preset time set in the invention is 1.5min, and the judgment action based on the internet of things is as follows: when the outdoor heat exchanger meets the frosting condition, the Internet of things analyzes the defrosting time of the air conditioning unit within 1.5 kilometers away from the current air conditioning unit within one hour by adopting a data analysis algorithm, and if more than half of the defrosting time of the air conditioning unit reaches a first preset time, the frosting of the outdoor heat exchanger is judged. In order to improve the accuracy of the analysis of the internet of things, a plurality of air conditioning units can be selected for analysis, and ten air conditioning units closest to the current air conditioning unit are adopted for analysis.
In addition, on the action of analyzing based on the internet of things, the traditional frosting judgment method is optimized, in the traditional frosting judgment method, judgment is carried out only on the basis of the pipe temperature of the outdoor heat exchanger, and large errors exist.
Specifically, the working parameters collected in the present invention include the temperature of the tubes of the outdoor heat exchanger and the pressure of the economizer, and the judgment of whether the outdoor heat exchanger meets the frosting condition according to the working parameters includes:
judging whether the tube temperature of the outdoor heat exchanger is lower than a preset temperature or not;
if yes, detecting the duration that the tube temperature of the outdoor heat exchanger is lower than the preset temperature, and judging that the outdoor heat exchanger meets the frosting condition when the duration is longer than the second preset duration.
The steps are based on the judgment logic of the tube temperature of the outdoor heat exchanger, and in order to avoid the condition of misjudgment caused by the fluctuation of the ambient temperature, when the tube temperature of the outdoor heat exchanger is lower than the preset temperature, the continuous time length lower than the preset temperature is further detected, only when the continuous time length reaches the second preset time length, the outdoor heat exchanger is determined to meet the frosting condition, and the misjudgment caused by the fluctuation of the ambient temperature is avoided.
It should be noted that the duration here does not refer to the total duration of the outdoor heat exchanger being lower than the preset temperature in the whole detection process, but the duration of the outdoor heat exchanger being lower than the preset temperature once, for this reason, when the tube temperature of the outdoor heat exchanger is detected, if the duration of the outdoor heat exchanger being lower than the preset temperature is detected to be less than the second preset duration, the recorded duration will be cleared when the tube temperature of the outdoor heat exchanger is raised back to the preset temperature, so as to detect the duration next time. Through this design, the misjudgment that environmental temperature change caused has been avoided to very big degree.
Specifically, the preset temperature is set to-4 ℃, the second preset time is set to 5min, and the specific detection logic is as follows: when the temperature of the outdoor heat exchanger is detected to be lower than minus 4 ℃, the time duration of the next time of the temperature of the outdoor heat exchanger is detected, the outdoor heat exchanger is determined to be frosted only when the time duration reaches 5min, otherwise, the recorded time duration is cleared, and the detection is restarted.
Furthermore, the logic for judging whether the outdoor heat exchanger is frosted based on the pressure of the economizer, which is pointed out in the invention, comprises the following steps:
judging whether the pressure of the economizer is in a preset pressure range or not, and if so, judging that the outdoor heat exchanger meets the frosting condition;
if not, whether the tube temperature of the outdoor heat exchanger is lower than the preset temperature is judged again.
The pressure judgment logic is arranged before the pipe temperature judgment logic of the outdoor heat exchanger judges that the frosting condition is met, namely the pressure judgment logic is executed only when the pipe temperature of the outdoor heat exchanger meets the frosting condition, and is used for further judging whether the outdoor heat exchanger meets the frosting condition or not and avoiding the problem of misjudgment caused by judging only by the pipe temperature.
In the invention, the preset pressure range is set to be 250-400 kpa, when the judgment logic of the pressure of the economizer is carried out, the frosting condition of the outdoor heat exchanger is determined to occur only when the pressure of the economizer is in the preset pressure range, otherwise, the judgment logic of the tube temperature of the outdoor heat exchanger is returned again, and the judgment action of the tube temperature of the outdoor heat exchanger is started again.
The preset temperature, the preset pressure range and the second preset time indicated by the defrosting judgment method are calculated according to the frosting condition of the outdoor heat exchanger. Specifically, the calculation of the parameters can be obtained through the internet of things, the environmental parameters of the outdoor heat exchanger of the air conditioning unit under the frosting condition are recorded for many times, and the average value of the environmental parameters is obtained to determine the environmental parameters, so that the accuracy of frosting judgment by adopting the parameters is high.
Specifically, the preset temperature is-4 ℃, the preset pressure range is 250-400 kpa, and the second preset time is 5min. The setting of each parameter is arranged before the working parameters of the outdoor heat exchanger are detected, so that the subsequent frosting judgment can be facilitated.
Furthermore, after the defrosting procedure is started, in order to prevent the air conditioning unit from being in the defrosting procedure for a long time, whether defrosting of the outdoor heat exchanger is completed needs to be detected, so that the method further comprises the following steps of:
and detecting whether the air conditioning unit meets the defrosting stop condition, if so, stopping defrosting, and returning to the judgment of the defrosting condition.
The defrosting stop condition can be set according to the frosting condition indicated above, specifically, the frosting condition is that the tube temperature of the outdoor heat exchanger is lower than-4 ℃, and the pressure of the economizer is 250 kpa-400 kpa. Through the setting of the condition of stopping frosting, the air conditioning unit can be prevented from being in the defrosting mode for a long time, and the electric energy waste is avoided.
Please refer to fig. 1, which is an overall flowchart of the defrosting determination method based on the internet of things according to the present invention;
firstly, the judgment is carried out according to the tube temperature T of the outdoor heat exchanger, if the tube temperature T of the outdoor heat exchanger is greater than the preset temperature Ts, the outdoor heat exchanger can be directly judged not to be frosted, the normal operation of the current air conditioning unit is judged, otherwise, if the tube temperature T of the outdoor heat exchanger is less than the preset temperature Ts, the duration time that the tube temperature T of the outdoor heat exchanger is less than the preset temperature Ts needs to be further judged, namely, in the figure 1, whether the tube temperature T < Ts lasts is judged, when the duration time reaches the second preset time, the judgment logic of the pressure of the economizer can be entered, and otherwise, the timing can be restarted.
The judgment logic of the economizer pressure is that whether the economizer pressure belongs to the set range is judged in the graph 1, the set range indicated here is the preset pressure range indicated above, the frosting phenomenon of the outdoor heat exchanger can be judged only when the pressure of the economizer is within the preset pressure range, otherwise, the misjudgment of the pipe temperature T of the outdoor heat exchanger can be judged, and the air conditioning unit can be normally operated.
When the outdoor heat exchanger is judged to meet the frosting condition through the pressure of the economizer, the judgment logic of the Internet of things is entered, a plurality of air conditioning units nearby the current air conditioning unit are collected through the Internet of things to be determined, and the accuracy of the current judgment is improved. According to the method, 10 air conditioning units are collected, the first preset time is set to be 1.5min, indicated judgment logic based on the Internet of things, namely ' whether the ratio of the defrosting time of the 10 units closest to the unit in the last hour is greater than 1.5min is larger than 50% or not in analysis ' in figure 1 ', and only when the judgment logic is yes, the outdoor heat exchanger of the current air conditioning unit is determined to be frosted, and a defrosting program is started.
After the defrosting program is started, whether the air conditioning unit meets a defrosting stop condition needs to be judged, and when the air conditioning unit meets the defrosting stop condition, the heating mode is restored again, and the judgment logic of frosting of the outdoor heat exchanger is started.
The invention also provides an air conditioning unit which adopts the defrosting judgment method based on the Internet of things.
In summary, compared with the prior art, the invention additionally adds the process of analyzing and judging the internet of things on the basis of the traditional frosting judgment logic, improves the accuracy of judging frosting by the system, achieves frosting and frostless defrosting, reduces the influence on the indoor air temperature when the air conditioning unit is frosted, and improves the comfort level of the user and the heating effect of the air conditioner.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A defrosting judgment method based on the Internet of things is characterized by comprising the following steps:
detecting working parameters of an outdoor heat exchanger when the air conditioning unit is in a heating mode;
judging whether the outdoor heat exchanger meets the frosting condition or not according to the working parameters;
if yes, judging whether the outdoor heat exchanger frosts according to the Internet of things, and starting a defrosting program when judging that the outdoor heat exchanger frosts.
2. The defrosting judgment method according to claim 1, wherein judging whether the outdoor heat exchanger frosts according to the internet of things comprises:
acquiring defrosting time of a plurality of air conditioning units nearby the current air conditioning unit;
recording the air conditioning units with the defrosting time length longer than a first preset time length, and judging whether the number of the air conditioning units with the defrosting time length longer than the first preset time length reaches half of all the air conditioning units or not;
if yes, judging that the outdoor heat exchanger frosts, otherwise, judging that the outdoor heat exchanger does not frost.
3. The defrosting determination method of claim 1 wherein the operating parameters comprise a tube temperature of an outdoor heat exchanger and an economizer pressure.
4. The defrosting judgment method according to claim 1, wherein judging whether the outdoor heat exchanger satisfies a frosting condition according to the operating parameter comprises:
judging whether the tube temperature of the outdoor heat exchanger is lower than a preset temperature or not;
if yes, detecting the duration that the tube temperature of the outdoor heat exchanger is lower than the preset temperature, and judging that the outdoor heat exchanger meets the frosting condition when the duration is longer than a second preset duration.
5. The defrosting determination method according to claim 4, further comprising, before determining that the outdoor heat exchanger satisfies the frosting condition:
judging whether the pressure of the economizer is in a preset pressure range or not, and if so, judging that the outdoor heat exchanger meets the frosting condition;
if not, whether the tube temperature of the outdoor heat exchanger is lower than the preset temperature is judged again.
6. The defrosting judgment method according to claim 4, further comprising, before detecting the operating parameter of the outdoor heat exchanger: and presetting the preset temperature, the preset pressure range and a second preset time according to the frosting condition of the outdoor heat exchanger.
7. The defrosting judgment method according to claim 1, further comprising detecting whether the air conditioning unit meets a defrosting stop condition after the defrosting program is started, if so, stopping defrosting, and returning to judgment of the defrosting condition.
8. The defrosting judgment method according to claim 6, wherein the preset temperature is-4 ℃, the preset pressure range is 250kpa to 400kpa, and the second preset time period is 5min.
9. The defrosting judgment method according to claim 2, wherein the first preset time period is 1.5min.
10. Air conditioning unit, characterized in that, the air conditioning unit adopts the defrosting judgment method of any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211485947.7A CN115727479A (en) | 2022-11-24 | 2022-11-24 | Defrosting judgment method based on Internet of things and air conditioning unit |
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| CN202211485947.7A CN115727479A (en) | 2022-11-24 | 2022-11-24 | Defrosting judgment method based on Internet of things and air conditioning unit |
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