CN113432352B - Air source heat pump defrosting regulation and control method and system based on 5G Internet of things technology - Google Patents
Air source heat pump defrosting regulation and control method and system based on 5G Internet of things technology Download PDFInfo
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- CN113432352B CN113432352B CN202110694738.2A CN202110694738A CN113432352B CN 113432352 B CN113432352 B CN 113432352B CN 202110694738 A CN202110694738 A CN 202110694738A CN 113432352 B CN113432352 B CN 113432352B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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Abstract
The invention provides an air source heat pump defrosting regulation and control method and system based on a 5G internet of things technology, wherein the method is applied to a background management end of an air source heat pump cluster, the air source heat pump cluster comprises at least two air source heat pumps, and each air source heat pump is in communication connection with the background management end; the method comprises the following steps: the method comprises the following steps of S1, acquiring state information of each air source heat pump in an air source heat pump cluster, wherein the state information of the air source heat pumps comprises state acquisition information or working state information; the working state comprises a standby state, a heating state, a natural defrosting state and a reverse cycle defrosting state; and S2, controlling the working state conversion of each air source heat pump according to the total water inlet and outlet temperature information of the current air source heat pump cluster and the state information of the air source heat pumps. The invention intelligently controls the defrosting and working states of the air source heat pump based on the background management end, and is beneficial to improving the energy-saving level of the defrosting control of the air source heat pump.
Description
Technical Field
The invention relates to the technical field of new energy conservation, in particular to a defrosting regulation and control method and system for an air source heat pump based on a 5G internet of things technology.
Background
The air source heat pump is a device which is driven by a motor and adopts a vapor compression refrigeration cycle to transfer heat in low-grade heat source air to a high-level heat source such as water or air. When the ambient temperature is low and the humidity is high, the frosting phenomenon can occur in the heating process of the air source heat pump, and the heating efficiency is influenced. At this time, the air-source heat pump needs to be defrosted. The existing air source heat pump judges and controls defrosting conditions by the existing air source heat pump. For the judgment of the frosting condition, the existing air source heat pump judges the frosting condition according to the environmental temperature and the fin temperature, or adopts a timing defrosting mode. And if the frosting condition is met, defrosting by using a reverse circulation method. However, the air source heat pump in the prior art has the condition of unreasonable defrosting control, which causes energy waste.
Disclosure of Invention
Aiming at the problem that the defrosting control of the air source heat pump is unreasonable, the invention aims to provide an air source heat pump defrosting control method and system based on the 5G Internet of things technology.
The purpose of the invention is realized by adopting the following technical scheme:
on one hand, the invention discloses an air source heat pump defrosting regulation and control method based on a 5G internet of things technology, which is applied to a background management end of an air source heat pump cluster, wherein the air source heat pump cluster comprises at least two air source heat pumps, and each air source heat pump is in communication connection with the background management end; the method comprises the following steps:
s1, acquiring state information of each air source heat pump in an air source heat pump cluster, wherein the state information of the air source heat pumps comprises state acquisition information or working state information; the working state comprises a standby state, a heating state, a natural defrosting state and a reverse cycle defrosting state;
and S2, controlling the working state conversion of each air source heat pump according to the total water inlet and outlet temperature information of the current air source heat pump cluster and the state information of the air source heat pumps.
In one embodiment, a heat pump control unit is arranged on the air source heat pump, and is used for acquiring state information of the air source heat pump and controlling the air source heat pump to complete working state conversion according to a control command sent by a background management end, wherein the heat pump control unit is in communication connection with the background management end;
in step S1, obtaining state information of each air source heat pump in the air source heat pump cluster includes:
and receiving the state information of the air source heat pump transmitted by the heat pump control unit, wherein the state acquisition information comprises the ambient temperature, the ambient humidity, the fin temperature and the suction pressure of the air source heat pump acquired by the heat pump control unit.
In one embodiment, in step S2, controlling the working state of each air source heat pump to be switched according to the total water inlet and outlet temperature information of the current air source heat pump cluster and the state information of the air source heat pump, specifically includes:
s21, judging whether a heating requirement exists according to the total water inlet and outlet temperature information of the current air source heat pump cluster; if the heating requirement exists, selecting an air source heat pump in a standby state and sending a control instruction to the air source heat pump to enable the air source heat pump to be converted into a heating state;
s22, judging whether a heating stopping demand exists according to the total water inlet and outlet temperature information of the current air source heat pump cluster; if the heating stop requirement exists, selecting an air source heat pump in a heating state and sending a control instruction to the air source heat pump to enable the air source heat pump to be switched to a natural defrosting state;
s23, aiming at the air source heat pump in the natural defrosting state, judging whether the natural defrosting state is finished or not according to the refrigerant temperature and the fin temperature of the air source heat pump, and if the refrigerant temperature and the fin temperature are both greater than 0 ℃, sending a control instruction to the air source heat pump to enable the air source heat pump to be converted to the standby state.
In one embodiment, when the air source heat pump is in a natural defrosting state, the heat pump control unit controls a compressor of the air source heat pump to be in a closed state according to a received control instruction, the four-way reversing valve is in a heating state, the electronic expansion valve keeps a standby opening degree to enable a refrigerant in the evaporator to be communicated with the liquid storage device, and the fan is in an automatic operation state;
the automatic running state of the fan is related to the environment temperature detected by the heat pump, if the environment temperature is less than or equal to 0 ℃, the fan stops, and if the environment temperature is greater than 0 ℃, the fan runs intermittently according to a set period.
In one embodiment, step S21 further includes:
if the air source heat pump cluster does not have the heating requirement, the background management terminal further judges whether the current air source heat pump cluster has the standby defrosting replacement requirement or not, if the standby defrosting replacement requirement exists, one air source heat pump in the heating state is selected and a control instruction is sent to the air source heat pump, so that the air source heat pump is switched to the natural defrosting state, and one air source heat pump in the standby state is selected and a control instruction is sent to the air source heat pump, so that the air source heat pump is switched to the heating state.
In one embodiment, the step S21, if there is a heating requirement, further includes:
further detecting whether an air source heat pump in a standby state exists in the current air source heat pump cluster, if the air source heat pump in the standby state exists, selecting one air source heat pump in the standby state and sending a control instruction to the air source heat pump to enable the air source heat pump to be switched to a heating state; if the air source heat pump in the standby state does not exist, selecting one air source heat pump in the natural defrosting state and sending a control command to the air source heat pump to enable the air source heat pump to be converted into the reverse cycle defrosting state.
In one embodiment, step S22 further comprises:
if the heating requirement is not stopped, further judging whether the air source heat pump in the heating state reaches the optimal defrosting time, and if the optimal defrosting time is not reached, controlling the air source heat pump to keep the heating state; if the optimal defrosting time is reached, further judging whether an air source heat pump in a standby state exists in the current air source heat pump cluster, and if no air source heat pump in the standby state exists, sending a control instruction to the air source heat pump reaching the optimal defrosting time to enable the air source heat pump to be converted into a reverse cycle defrosting state; if the air source heat pump in the standby state exists at present, a standby defrosting replacement requirement is generated, a control instruction is sent to the air source heat pump reaching the optimal defrosting time to enable the air source heat pump to be converted to the natural defrosting state, and one air source heat pump in the standby state is selected to send the control instruction to the air source heat pump to enable the air source heat pump to be converted to the heating state.
In one embodiment, in step S2, controlling the working state of each air source heat pump to be switched according to the total water inlet and outlet temperature information of the current air source heat pump cluster and the state information of the air source heat pump, further includes:
and S24, judging whether the reverse cycle defrosting is finished or not according to the temperature of the fins of the air source heat pump aiming at the air source heat pump in the reverse cycle defrosting state, and if the reverse cycle defrosting is finished, sending a control instruction to the air source heat pump to enable the air source heat pump to be converted into the heating state.
In one embodiment, the method further comprises: aiming at the environment temperature data collected by each air source heat pump, performing mean square error calculation on the environment temperature data collected by all the air source heat pumps, and if the mean square error is smaller than or equal to a set threshold value, the environment temperature of the heat pump cluster is equal to the average value of the environment temperature data collected by all the air source heat pumps; and if the mean square deviation is larger than the set threshold, judging that external conditions exist to cause the detection data to be inaccurate, performing data processing on all the environment temperature data, sequentially filtering the deviated environment temperature data until the mean square deviation of the residual data is smaller than or equal to the set threshold, and using the average value of the residual environment temperature data as the environment temperature of the air source heat pump cluster.
On the other hand, the air source heat pump defrosting regulation and control system based on the 5G internet of things technology comprises a background management end and an air source heat pump cluster, wherein the air source heat pump cluster comprises at least two air source heat pumps, and each air source heat pump is provided with a heat pump control unit; the heat pump control unit is in communication connection with the background management terminal;
the heat pump control unit is used for acquiring state information of the air source heat pump and controlling the air source heat pump to complete working state conversion according to a control instruction sent by the background management end;
the background management end is used for realizing the air source heat pump defrosting regulation and control method based on the 5G Internet of things technology in any one of the above embodiments.
The beneficial effects of the invention are as follows:
the invention intelligently controls the defrosting and working states of the air source heat pump based on the background management end, and is beneficial to improving the energy-saving level of the defrosting control of the air source heat pump.
According to the invention, the data connection between the air source heat pump and the background management end is established by utilizing a 5G or other mobile communication network. The strong information processing capacity of a computer is utilized, the background management end collects the state information of the air source heat pump cluster, and the control instruction is sent to each air source heat pump through data processing and calculation, so that cluster control of the heat pump unit is realized.
The invention increases the 'natural defrosting' running state of the air source heat pump and utilizes the ambient temperature to the maximum extent to defrost. Under the natural defrosting state, whether defrosting is finished or not is judged by combining the temperature of the fins and the saturated evaporation temperature of the refrigerant in the evaporator. The energy-saving level of the defrosting of the air source heat pump can be effectively improved.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, without inventive effort, further drawings may be derived from the following figures.
Fig. 1 is a flowchart of a method of an exemplary embodiment of a defrosting regulation and control method of an air source heat pump based on a 5G internet of things technology;
FIG. 2 is a flow chart illustrating an air source heat pump defrost control in accordance with an embodiment of the present invention;
FIG. 3 is a block diagram of a heat pump control unit frame according to an embodiment of the present invention;
FIG. 4 is a schematic view illustrating an exemplary embodiment of an air source heat pump operating state transition control;
FIG. 5 is a schematic view of an air-source heat pump according to an embodiment of the present invention;
fig. 6 is a frame structure diagram of an exemplary embodiment of a defrosting regulation and control system of an air source heat pump based on 5G internet of things technology.
Detailed Description
The invention is further described in connection with the following application scenarios.
Referring to fig. 1, the air source heat pump defrosting regulation and control method based on the 5G internet of things is shown, wherein the method is applied to a background management end of an air source heat pump cluster, the air source heat pump cluster comprises at least two air source heat pumps, each air source heat pump is provided with a heat pump control unit, the heat pump control units are used for acquiring state information of the air source heat pumps, sending the state information to the background management end, and controlling the air source heat pumps to complete working state conversion according to a control instruction sent by the background management end, and the heat pump control units are in communication connection with the background management end; the method comprises the following steps:
and S0, the background management end executes initialization operation and loads air source heat pump information in the air source heat pump cluster.
S1, a background management end acquires state information of each air source heat pump in an air source heat pump cluster, wherein the state information of the air source heat pumps comprises state acquisition information or working state information; the working state comprises a standby state, a heating state, a natural defrosting state, a reverse cycle defrosting state and the like; the state acquisition information comprises the ambient temperature, the ambient humidity, the fin temperature, the suction pressure and the like of the air source heat pump acquired by the heat pump control unit.
S2, the background management end controls the working state conversion of each air source heat pump according to the total water inlet and outlet temperature information of the current air source heat pump cluster and the state information of the air source heat pumps.
The frosting of the air source heat pump is influenced by various factors such as the ambient temperature, the humidity, the wind speed, the operation state of the heat pump and the like. The method aims at the problem that the existing air source heat pump is generally subjected to frosting judgment and defrosting control by a single chip microcomputer in the heat pump, is limited by the information processing capacity of the single chip microcomputer, and is inaccurate in frosting judgment and defrosting control, so that energy waste is caused. According to the embodiment of the invention, the data connection between the air source heat pump and the background management terminal is established by utilizing the 5G or other mobile communication networks. The strong information processing capability of a computer is utilized, the background management end collects the state information of the air source heat pump cluster, and the control instruction is sent to each air source heat pump through data processing and calculation, so that the cluster control of the heat pump unit is realized.
The air source heat pump cluster comprises a plurality of air source heat pumps which jointly complete a target heating task.
In one embodiment, the background management end comprises intelligent terminal equipment such as a background computer, a system management platform and a cloud server; the heat pump control unit comprises control circuits arranged on each air source heat pump, or a special device and an external control device of the air source heat pump, and the like.
In one scenario, referring to fig. 2, the defrosting control process of the air source heat pump cluster is completed by the air source heat pump control circuit and the background computer together, the air source heat pump control circuit realizes the acquisition of sensor information and the execution of state conversion, and the background computer realizes the data calculation and the issuing of control instructions.
And the background computer executes initialization operation and loads the information of the air source heat pump in the air source heat pump cluster.
The air source heat pump control circuit first performs acquisition of the sensor signal every cycle.
And the air source heat pump control circuit sends the air source heat pump control circuit to the background computer according to a set time interval.
And the background computer performs data calculation by using data of all the air source heat pumps of the cluster according to the received information sent by the air source heat pump to form a control instruction.
And the background computer sends a control command to the related air source heat pump.
After receiving a control instruction of a background computer, the air source heat pump judges whether the working state needs to be changed or not, and if so, the working state is converted.
The air source heat pump control circuit performs the automatic control function of the heat pump.
In one embodiment, referring to fig. 3, the heat pump control unit includes a central processing module, a power module, a collection module, a driving module, and a 5G communication module;
the power supply module is used for converting a 220V alternating current power supply into a low-voltage direct current power supply required by the heat pump control unit;
the acquisition module is used for acquiring state acquisition information of the air source heat pump, wherein the state acquisition information comprises ambient temperature, ambient humidity, fin temperature, suction pressure and the like;
the driving module comprises a compressor of the air source heat pump, a four-way reversing valve, a fan, an electronic expansion valve and the like;
the central processing module is used for transmitting the state acquisition information of the air source heat pump acquired by the acquisition module to the background management end, receiving the control instruction transmitted by the background management end, and controlling the driving module to complete the working state conversion according to the received control instruction;
the 5G communication module is connected with the SIM card and used for establishing a TCP/IP data channel between the heat pump control unit and the background management end and realizing bidirectional data transmission between the heat pump control unit and the background management end.
In one embodiment, referring to fig. 4, in step S2, controlling the working state transition of each air source heat pump according to the total water inlet and outlet temperature information of the current air source heat pump cluster and the state information of the air source heat pump specifically includes:
s21, judging whether a heating requirement exists or not (for example, whether heating equipment needs to be added to improve the water temperature or not) by the background management end according to the total water inlet and outlet temperature information of the current air source heat pump cluster; if the air source heat pump needs to be heated, the background management end selects one standby air source heat pump and sends a control instruction to the standby air source heat pump, so that the air source heat pump is switched to a heating state;
s22, judging whether a heating stopping requirement exists or not by the background management end according to the total water inlet and outlet temperature information of the current air source heat pump cluster; if the heating stopping requirement exists, the background management end selects an air source heat pump in a heating state and sends a control instruction to the air source heat pump to enable the air source heat pump to be converted into a natural defrosting state;
s23, aiming at the air source heat pump in the natural defrosting state, the background management end judges whether the natural defrosting state is finished or not according to the refrigerant temperature and the fin temperature of the air source heat pump, and if the refrigerant temperature and the fin temperature are both greater than 0 ℃, the background management end sends a control instruction to the air source heat pump to enable the air source heat pump to be converted into the standby state.
Referring to fig. 5, the present solution defines four operating states of the air source heat pump: standby state, heating state, reverse cycle defrosting state and natural defrosting state. The first three operating states are prior art. When the air source heat pump is in a natural defrosting state, the heat pump control unit controls a compressor of the air source heat pump to be in a closing state according to a received control instruction, the four-way reversing valve is in a heating state, the electronic expansion valve keeps a standby opening degree to enable a refrigerant in the evaporator to be communicated with the liquid storage device, and the fan is in an automatic operation state; the automatic running state of the fan is related to the environment temperature detected by the heat pump, if the environment temperature is less than or equal to 0 ℃, the fan stops, and if the environment temperature is greater than 0 ℃, the fan runs intermittently according to a set period. The conversion of each working state of the air source heat pump is controlled by a background computer.
The technical problem that energy is wasted due to the fact that a defrosting method is unreasonable due to the fact that a heat pump in the prior art immediately turns to a reverse cycle defrosting mode when judging that an air source heat pump meets defrosting conditions and returns to a heating mode after defrosting is completed is solved. In actual operation, if the environmental conditions allow, the heat pump can be completely shut down and another standby heat pump can be started, and the frost is dissolved by using natural conditions. The invention increases the 'natural defrosting' running state of the air source heat pump, and utilizes the environmental temperature to the maximum extent to defrost. Under the natural defrosting state, whether defrosting is finished or not is judged by combining the temperature of the fins and the saturated evaporation temperature of the refrigerant in the evaporator. The energy-saving level of the air source heat pump defrosting can be effectively improved.
In one embodiment, step S21 further includes:
if the air source heat pump cluster does not have a heating requirement, the background management terminal further judges whether the current air source heat pump cluster has an standby defrosting replacement requirement (for example, a certain device in the cluster needs to be switched from a heating state to a natural defrosting state, and a standby device needs to be supplemented for heating to maintain heat source output).
In one embodiment, step S21, if there is a heating requirement, further includes:
the background management end further detects whether an air source heat pump in a standby state exists in the current air source heat pump cluster, if the air source heat pump in the standby state exists, the background management end selects one air source heat pump in the standby state and sends a control instruction to the air source heat pump so that the air source heat pump is converted into a heating state; if the air source heat pump in the standby state does not exist, the background management end selects one air source heat pump in the natural defrosting state and sends a control instruction to the air source heat pump, so that the air source heat pump is converted into the reverse cycle defrosting state.
In one embodiment, step S22 further comprises:
if the heating requirement is not stopped, the background management end further judges whether the air source heat pump in the heating state reaches the optimal defrosting time, and if the optimal defrosting time is not reached, the background management end controls the air source heat pump to keep the heating state; if the optimal defrosting time is reached, the background management end further judges whether the current environment temperature is greater than 0 ℃, and if the environment temperature is less than or equal to 0 ℃, the background management end sends a control instruction to the air source heat pump to enable the air source heat pump to be converted into a reverse cycle defrosting state; if the environmental temperature is higher than 0 ℃, the background management end further judges whether the air source heat pump in the standby state exists in the current air source heat pump cluster, and if the air source heat pump in the standby state does not exist at present, the background management end sends a control instruction to the air source heat pump reaching the optimal defrosting time to enable the air source heat pump to be converted into the reverse cycle defrosting state; if the air source heat pump in the standby state exists at present, the background management end generates a standby defrosting replacement demand, sends a control instruction to the air source heat pump reaching the optimal defrosting time to enable the air source heat pump to be converted into the natural defrosting state, and simultaneously selects one air source heat pump in the standby state to send the control instruction to the air source heat pump to enable the air source heat pump to be converted into the heating state.
In one embodiment, the step S22 of determining whether the optimal defrosting time of the air source heat pump in the heating state is reached specifically includes:
the background management end calculates the current frosting degree according to the state acquisition information of the air source heat pump, and the method comprises the following steps: according to the data sent by each heat pump, each frosting process is automatically recorded, the big data is used for calculating, the change characteristic value of each state acquisition information in the frosting process in various temperature and humidity environments is generated, and the current frosting degree is obtained according to the acquired state acquisition information.
And the background management end calculates the optimal defrosting time according to the current frosting degree.
Because the energy efficiency of the air source heat pump is reduced when the air source heat pump heats under the frosting condition, the optimal energy efficiency state can be reached after the heat pump is started or stopped for a while. According to the method, an energy efficiency curve of the frosting and defrosting starting process is established in the background management end, and an optimal defrosting time point is obtained by utilizing an optimal algorithm.
In the prior art, a fixed judgment condition is used as a basis for triggering defrosting, and if the condition is not met, defrosting is not performed. The energy efficiency of the air source heat pump is gradually reduced along with the aggravation of frosting, and if the defrosting triggering condition cannot be met for a long time, the overall energy efficiency of the heat pump is influenced. In the embodiment, the data of each heat pump at each working condition point is established by utilizing a big data technology, and the frosting degree is calculated by data comparison in the heating state of the heat pump. According to the comprehensive operation state of the heat pump cluster, whether the heat pump needs defrosting is judged by using an optimal algorithm, and a single-machine defrosting judgment method adopted in the prior art is replaced, so that the energy utilization is more reasonable.
In one embodiment, in step S2, the background management end controls the working state conversion of each air source heat pump according to the total water inlet and outlet temperature information of the current air source heat pump cluster and the state information of the air source heat pump, and the method further includes:
s24, the background management end judges whether reverse cycle defrosting is finished or not according to the temperature of the fins of the air source heat pump aiming at the air source heat pump in the reverse cycle defrosting state, and if the reverse cycle defrosting is finished, the background management end sends a control instruction to the air source heat pump to enable the air source heat pump to be converted into the heating state.
In one embodiment, the method further comprises: the background management end calculates the mean square deviation of the environmental temperature data collected by all the air source heat pumps aiming at the environmental temperature data collected by all the air source heat pumps, and if the mean square deviation is less than or equal to a set threshold value, the environmental temperature of the heat pump cluster is equal to the average value of the data collected by all the heat pumps; and if the mean square deviation is larger than the set threshold, judging that external conditions exist to cause the detection data to be inaccurate, processing all data, sequentially filtering deviated data until the mean square deviation of the residual data is smaller than or equal to the set threshold, and using the average value of the residual data as the ambient temperature of the air source heat pump cluster.
The problem that in the prior art, the frosting condition of a single air source heat pump is judged according to the environment temperature and the fin temperature, and the environment temperature is not accurately collected is solved. In order to ensure the accuracy of measurement, a standard method for measuring the ambient air temperature needs to use a louver, and an air source heat pump generally does not have the condition, so that the measured ambient temperature has deviation. The temperature difference of ambient temperature and fin temperature is used as the condition that frosting was judged for the single heat pump, and ambient temperature measuring's deviation can cause frosting to judge inaccurately, causes the phenomenon of two kinds of extravagant energy: firstly, the phenomenon of wrong defrosting is generated, namely defrosting operation is executed when the heat pump is not frosted; and secondly, the phenomenon of delayed defrosting or incomplete defrosting is generated, the heat pump has the condition of long-time frosting operation, and the heating energy efficiency is greatly lower than the normal value.
The method is based on a background management end, the values of the ambient temperature sensors of all air source heat pumps are collected to be used as calculation data, mean square deviation calculation is carried out on the data, and data with high temperature values and low temperature values are filtered. The frosting condition of each heat pump is judged by using the calculated and processed environmental temperature value instead of the acquisition numerical value of a single heat pump, so that the measurement deviation caused by factors such as sunshine or icing is reduced, and the judgment accuracy is improved.
In one scenario, the air humidity data may also be processed in the above manner to filter the data with higher and lower humidity values, thereby improving the accuracy of measurement and determination.
Referring to fig. 6, it shows that the air source heat pump defrosting regulation and control system based on the 5G internet of things technology comprises a background management end and an air source heat pump cluster, wherein the air source heat pump cluster comprises at least two air source heat pumps, and each air source heat pump is provided with a heat pump control unit; the heat pump control unit is in communication connection with the background management end;
the heat pump control unit is used for acquiring state information of the air source heat pump and controlling the air source heat pump to complete working state conversion according to a control instruction sent by the background management end;
the background management end is used for realizing the air source heat pump defrosting regulation and control method based on the 5G Internet of things technology in any one of the above embodiments.
The air source heat pump defrosting regulation and control system provided by the invention is divided into two parts, wherein the first part is a heat pump control unit of the air source heat pump unit and is used for realizing state information acquisition and operation control of the air source heat pump. In the invention, each air source heat pump is controlled by a control circuit (heat pump control unit), and a plurality of air source heat pumps jointly form an air source heat pump cluster. The second part is a background management terminal (background computer) connected to the internet and used for remotely and automatically controlling the operation state of each heat pump in the air source heat pump cluster. The heating principle of the air source heat pump, the reverse cycle defrosting control principle, the water temperature regulation of the heat pump cluster and the like are known technologies, and the description of the technology is not repeated.
It should be noted that, functional units/modules in the embodiments of the present invention may be integrated into one processing unit/module, or each unit/module may exist alone physically, or two or more units/modules are integrated into one unit/module. The integrated units/modules may be implemented in the form of hardware, or may be implemented in the form of software functional units/modules.
From the above description of the embodiments, it is clear for a person skilled in the art that the embodiments described herein can be implemented in hardware, software, firmware, middleware, code or any appropriate combination thereof. For a hardware implementation, the processor may be implemented in one or more of the following units: an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a processor, a controller, a microcontroller, a microprocessor, other electronic units designed to perform the functions described herein, or a combination thereof. For a software implementation, some or all of the flow of the embodiments may be accomplished by a computer program instructing the associated hardware. In practice, the program may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. Computer-readable media can include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be analyzed by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. An air source heat pump defrosting regulation and control method based on 5G internet of things is applied to a background management end of an air source heat pump cluster, wherein the air source heat pump cluster comprises at least two air source heat pumps, each air source heat pump is in communication connection with the background management end, a heat pump control unit is arranged on each air source heat pump and used for acquiring state information of the air source heat pumps and controlling the air source heat pumps to complete working state conversion according to a control command sent by the background management end, and the heat pump control unit is in communication connection with the background management end; characterized in that the method comprises:
s1, acquiring state information of each air source heat pump in an air source heat pump cluster, wherein the state information of the air source heat pumps comprises state acquisition information or working state information; the working state comprises a standby state, a heating state, a natural defrosting state and a reverse cycle defrosting state;
the method for acquiring the state information of each air source heat pump in the air source heat pump cluster comprises the following steps:
receiving state information of the air source heat pump transmitted by the heat pump control unit, wherein the state acquisition information comprises the ambient temperature, the ambient humidity, the fin temperature and the suction pressure of the air source heat pump acquired by the heat pump control unit;
s2, controlling the working state of each air source heat pump to be switched according to the total water inlet and outlet temperature information of the current air source heat pump cluster and the state information of the air source heat pumps; the method specifically comprises the following steps:
s21, judging whether a heating requirement exists according to the total water inlet and outlet temperature information of the current air source heat pump cluster; if the air source heat pump has the heating requirement, selecting one standby air source heat pump and sending a control command to the standby air source heat pump to enable the air source heat pump to be switched to the heating state;
s22, judging whether a heating stopping demand exists according to the total water inlet and outlet temperature information of the current air source heat pump cluster; if the heating stopping requirement exists, selecting an air source heat pump in a heating state and sending a control instruction to the air source heat pump to enable the air source heat pump to be converted into a natural defrosting state;
s23, aiming at the air source heat pump in the natural defrosting state, judging whether the natural defrosting state is finished or not according to the refrigerant temperature and the fin temperature of the air source heat pump, and if the refrigerant temperature and the fin temperature are both greater than 0 ℃, sending a control instruction to the air source heat pump to enable the air source heat pump to be converted into a standby state;
the method further comprises the following steps: aiming at the environment temperature data collected by each air source heat pump, calculating the mean square error of the environment temperature data based on the environment temperature data collected by all the air source heat pumps, wherein if the mean square error is less than or equal to a set threshold value, the environment temperature of the heat pump cluster is equal to the average value of the environment temperature data collected by all the air source heat pumps; and if the mean square error is larger than the set threshold, judging that external conditions exist to cause the detected environment temperature data to be inaccurate, processing all environment temperature data, sequentially filtering the environment temperature data with deviation until the mean square error of the residual data is smaller than or equal to the set threshold, and using the average value of the residual environment temperature data as the environment temperature of the air source heat pump cluster.
2. The air source heat pump defrosting regulation and control method based on the 5G internet of things technology according to claim 1, characterized in that when the air source heat pump is in a natural defrosting state, the heat pump control unit controls a compressor of the air source heat pump to be in a closed state according to a received control instruction, the four-way reversing valve is in a heating state, the electronic expansion valve keeps a standby opening degree to enable a refrigerant in the evaporator to be communicated with a liquid storage device, and the fan is in an automatic operation state;
the automatic running state of the fan is related to the ambient temperature detected by the heat pump, if the ambient temperature is less than or equal to 0 ℃, the fan stops, and if the ambient temperature is more than 0 ℃, the fan runs intermittently according to a set period.
3. The air source heat pump defrosting regulation and control method based on the 5G Internet of things technology according to claim 1, wherein the step S21 further comprises the following steps:
if the air source heat pump cluster does not have the heating requirement, the background management terminal further judges whether the current air source heat pump cluster has the standby defrosting replacement requirement or not, if the standby defrosting replacement requirement exists, one air source heat pump in the heating state is selected and a control instruction is sent to the air source heat pump, so that the air source heat pump is switched to the natural defrosting state, and one air source heat pump in the standby state is selected and a control instruction is sent to the air source heat pump, so that the air source heat pump is switched to the heating state.
4. The air source heat pump defrosting control method based on 5G Internet of things technology according to claim 1, wherein in step S21, if there is a heating demand, the method further comprises:
further detecting whether an air source heat pump in a standby state exists in the current air source heat pump cluster, if the air source heat pump in the standby state exists, selecting one air source heat pump in the standby state and sending a control instruction to the air source heat pump to enable the air source heat pump to be switched to a heating state; if the air source heat pump in the standby state does not exist, selecting one air source heat pump in the natural defrosting state and sending a control command to the air source heat pump to enable the air source heat pump to be switched to the reverse cycle defrosting state.
5. The air source heat pump defrosting regulation and control method based on the 5G Internet of things technology according to claim 1, wherein the step S22 further comprises the following steps:
if the heating requirement is not stopped, further judging whether the air source heat pump in the heating state reaches the optimal defrosting time, and if the optimal defrosting time is not reached, controlling the air source heat pump to keep the heating state; if the optimal defrosting time is reached, further judging whether an air source heat pump in a standby state exists in the current air source heat pump cluster, if no air source heat pump in the standby state exists, sending a control instruction to the current air source heat pump reaching the optimal defrosting time to enable the current air source heat pump to be converted into a reverse cycle defrosting state; if the air source heat pump in the standby state exists at present, a standby defrosting replacement requirement is generated, a control instruction is sent to the air source heat pump reaching the optimal defrosting time to enable the air source heat pump to be converted to the natural defrosting state, and one air source heat pump in the standby state is selected to send the control instruction to the air source heat pump to enable the air source heat pump to be converted to the heating state.
6. The air source heat pump defrosting regulation and control method based on the 5G internet of things technology according to claim 1, wherein in the step S2, the working state conversion of each air source heat pump is controlled according to the total water inlet and outlet temperature information of the current air source heat pump cluster and the state information of the air source heat pump, and the method further comprises the following steps:
s24, aiming at the air source heat pump in the reverse cycle defrosting state, judging whether reverse cycle defrosting is finished or not according to the temperature of the fins of the air source heat pump, and if the reverse cycle defrosting is finished, sending a control instruction to the air source heat pump to enable the air source heat pump to be switched to the heating state.
7. An air source heat pump defrosting regulation and control system based on a 5G internet of things technology is characterized by comprising a background management end and an air source heat pump cluster, wherein the air source heat pump cluster comprises at least two air source heat pumps, and each air source heat pump is provided with a heat pump control unit; the heat pump control unit is in communication connection with the background management end;
the heat pump control unit is used for acquiring state information of the air source heat pump and controlling the air source heat pump to complete working state conversion according to a control instruction sent by the background management end;
the background management end is used for realizing the air source heat pump defrosting regulation and control method based on the 5G Internet of things technology in any one of claims 1 to 6.
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