CN112097366B - Control method based on heat exchange system - Google Patents
Control method based on heat exchange system Download PDFInfo
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- CN112097366B CN112097366B CN201910524077.1A CN201910524077A CN112097366B CN 112097366 B CN112097366 B CN 112097366B CN 201910524077 A CN201910524077 A CN 201910524077A CN 112097366 B CN112097366 B CN 112097366B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a control method based on a heat exchange system, which comprises a control unit, wherein the control unit comprises a control module, a temperature detection module and a time module, the temperature detection module is used for detecting a temperature signal of a coil pipe of an outdoor heat exchanger and transmitting the corresponding temperature signal to the control module, and the control module receives the temperature signal and controls the outdoor fan to rotate according to a time signal of the time module. In addition, when the system needs defrosting, the heat exchange system is unchanged in heating working condition, the outdoor fan is stopped and then reversed, the frost is blown off, and the traditional defrosting time is reduced or even eliminated as much as possible.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method based on a heat exchange system.
Background
The refrigerating capacity requirement of the refrigerating air conditioner is far greater than the heating capacity requirement, and the refrigerating and heating requirements also have energy efficiency requirements. The track air conditioner uses the variable frequency compressor to cope with the demands of different working conditions, however, when nominal heating is performed, the measured heating quantity is larger, and the energy efficiency is lower. If the frequency of the compressor is further reduced to improve the energy efficiency, the energy efficiency cannot be improved, and the problems of difficult oil return, quick frosting period, frequent defrosting and the like are caused by too low flow of the system refrigerant due to too low frequency of the compressor.
The capacity degradation during defrosting is more obvious, and the contribution of the air conditioner to indoor heating during defrosting is 0, so that the average heating capacity is reduced. Because the conventional air conditioner is generally designed in a refrigeration countercurrent mode, the air conditioner is generally frosted in a countercurrent mode on the air outlet side during heating. When defrosting, the frost on the fins of the outdoor fan can be removed only by heat melting due to the unchanged wind direction, and the time is long.
Disclosure of Invention
The control method based on the heat exchange system is used for solving the technical problems that frost on fins of an outdoor fan in the prior art can only be melted and removed by heat, and the time is long.
The invention adopts the following technical scheme:
the control method based on the heat exchange system comprises a control unit, wherein the control unit comprises a control module, a temperature detection module and a time module, the temperature detection module is used for detecting a temperature signal of a coil pipe of an outdoor heat exchanger and transmitting the corresponding temperature signal to the control module, the control module receives the temperature signal, controls the outdoor fan to rotate according to the temperature signal and the time signal of the time module, controls the heat exchange system to heat and the outdoor fan to rotate positively, and reverses the outdoor fan when the temperature of the coil pipe of the outdoor heat exchanger is larger than or equal to tc1; when the outdoor fan rotates reversely, when the coil temperature of the outdoor heat exchanger is smaller than or equal to tc2, the outdoor fan is stopped and then rotates forwards, wherein tc2 is smaller than tc1.
In one embodiment, when the outdoor fan rotates positively, the positive rotation time of the outdoor fan is controlled to be greater than or equal to T1; when the outdoor fan is reversed, controlling the reversing time of the outdoor fan to be more than or equal to T2.
In one embodiment, the method further comprises the steps of:
when the coil of the outdoor heat exchanger is smaller than or equal to tc3, the outdoor fan stops running, the blower is not stopped, the heat exchange system is in a refrigeration mode for defrosting, and tc3 is smaller than tc2.
In one embodiment, the coil temperature rises to tc4 or the defrost time of the outdoor fan reaches T3, and the heat exchange system exits defrost mode.
In one embodiment, the ambient temperature is Te, and when Te is greater than 5 degrees, T1 is 5 minutes, T2 is 30 minutes, tc1 is 3 ℃, tc2 is 1 ℃, and tc3 is-3 ℃.
In one embodiment, the ambient temperature is Te, and when Te is more than 0 and less than or equal to 5, T1 is 5min, T2 is 25min, tc1 is 1 ℃, tc2 is-1 ℃, and tc3 is-5 ℃.
In one embodiment, the ambient temperature is Te, and when Te is less than or equal to-5 and less than or equal to 0, T1 is 5min, T2 is 20min, tc1 is-4 ℃, tc2 is-6 ℃, and tc3 is-10 ℃.
In one embodiment, the ambient temperature is Te, and when Te is less than or equal to-5, T1 is 5min, T2 is 15min, tc1 is 15 ℃, tc2 is-7 ℃, and tc3 is-13 ℃.
In one embodiment, the heat exchange system comprises a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger and a throttling element, wherein the throttling element is arranged between the indoor heat exchanger and the outdoor heat exchanger, the compressor, the outdoor heat exchanger and the indoor heat exchanger form a loop through the four-way valve, and the four-way valve switches the flow direction of a refrigerant in the loop.
Compared with the prior art, the control method based on the heat exchange system provided by the invention has the following advantages:
when the heat exchange system heats, the outdoor fan is controlled to rotate positively and reversely, the average power of the outdoor fan is reduced, energy is saved on the basis of meeting the heating quantity requirement, and the energy efficiency requirement is met. In addition, when the system needs defrosting, the heat exchange system is unchanged in heating working condition, the outdoor fan is stopped and then reversed, the frost is blown off, and the traditional defrosting time is reduced or even eliminated as much as possible.
Drawings
The following drawings are only for better understanding of the technical solution of the present invention by those skilled in the art, and are not limiting of the present invention, and other drawings can be obtained according to the technical solution of the present invention by those skilled in the art.
FIG. 1 is a schematic diagram of a heat exchange system according to an embodiment of the present invention;
FIG. 2 is a control system block diagram of a heat exchange system;
FIG. 3 is a flow chart of a control method based on a heat exchange system;
fig. 4 is a logic diagram of a control method based on a heat exchange system.
Description of the reference numerals:
100. a heat exchange system; 10. a liquid storage tank; 20. a compressor; 30. a four-way valve; 31. a first valve port; 32. a second valve port; 33. a third valve port; 34. a fourth valve port; 40. an indoor heat exchanger; 50. an outdoor heat exchanger; 51. an outdoor fan; 60. a throttle element; 70. a control unit; 71. a control module; 72. a temperature detection module; 73. and a time module.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For a better description and illustration of embodiments of the present application, reference may be made to one or more of the accompanying drawings, but additional details or examples used to describe the drawings should not be construed as limiting the scope of any one of the inventive, presently described embodiments or preferred modes of carrying out the present application.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, the heat exchange system 100 according to the present invention is capable of effectively controlling the temperature of a target environment, and using its own cooling or heating capacity to supply cooling or heating to the target environment, so that an object in the target environment is in a suitable target temperature range.
The heat exchange system 100 comprises a compressor 20, a four-way valve 30, an indoor heat exchanger 40, an outdoor heat exchanger 50 and a throttling element 60, wherein the throttling element 60 is arranged between the indoor heat exchanger 40 and the outdoor heat exchanger 50, the compressor 20, the outdoor heat exchanger 50 and the indoor heat exchanger 40 form a loop through the four-way valve 30, and the four-way valve 30 switches the refrigerant flow direction in the loop. The refrigerant is an intermediate medium in the heat exchange loop for circulating and changing the ambient temperature, wherein the compressor 20 is used for compressing a low-pressure gaseous refrigerant into a high-pressure gaseous refrigerant, the throttling element 60 is used for throttling and reducing the pressure to change the high-pressure liquid refrigerant into the low-pressure liquid refrigerant, the outdoor heat exchanger 50 is used for exchanging heat between the refrigerant and a heat exchange medium such as air passing through the outdoor heat exchanger 50, and the four-way valve 30 is used for switching the flow direction of the refrigerant to realize the switching of the refrigerating or heating heat exchange loop.
The four-way valve 30 is provided with a first valve port 31, a second valve port 32, a third valve port 33 and a fourth valve port 34, wherein the first valve port 31 is connected with the compressor 20, the second valve port 32 is connected with the indoor heat exchanger 40, the third valve port 33 is connected with the liquid storage tank 10, and the fourth valve port is connected with the outdoor heat exchanger 50. During cooling of the heat exchange system 100: the first port 31 communicates with the fourth port 34, and the second port 32 communicates with the third port 33. When the heat exchange system 100 heats: the first port 31 communicates with the second port 32, and the third port 33 communicates with the fourth port 34.
The heating cycle principle of the heat exchange system 100 is as follows: refrigerant is sucked from the liquid storage tank 10 by the compressor 20, is conveyed to the first valve port 31 of the four-way valve 30, flows into the indoor heat exchanger 40 from the second valve port 32, flows into the outdoor heat exchanger 50 through the throttling element 60, then flows into the fourth valve port 34 of the four-way valve 30, and finally flows into the liquid storage tank 10 through the third valve port 33 of the four-way valve 30, and at the moment, the heat exchange system 100 achieves the aim of heating; the low-pressure gaseous refrigerant is again introduced into the compressor 20 to form the next heating cycle.
The principle of the refrigeration cycle of the heat exchange system 100 is as follows: refrigerant is sucked from the liquid storage tank 10 by the compressor 20, is conveyed to the first valve port 31 of the four-way valve 30, flows into the outdoor heat exchanger 50 from the fourth valve port 34, flows into the indoor heat exchanger 40 through the throttling element 60, then flows into the second valve port 32 of the four-way valve 30, and finally flows into the liquid storage tank 10 through the third valve port 33 of the four-way valve 30, and at the moment, the heat exchange system 100 achieves the aim of refrigeration; the low-pressure gaseous refrigerant is again introduced into the compressor 20 to form the next refrigeration cycle.
The compressor 20 includes a motor (not shown), a crankshaft (not shown), a connecting rod (not shown), a piston (not shown), a cylinder (not shown), an intake pipe (not shown), an exhaust pipe (not shown), and the like, and the compression process of the compressor 20 is as follows: the compressor 20 is directly driven by the motor to rotate the crankshaft, which drives the connecting rod to reciprocate the piston, resulting in a change in cylinder volume. The low-pressure gaseous refrigerant is introduced into the cylinder through the intake valve due to the variation of the pressure in the cylinder, and is compressed into the high-pressure gaseous refrigerant due to the reduction of the cylinder volume in the compression stroke.
The compressor 20 in the heat exchange system 100 may be a reciprocating compressor or a rotary compressor, as long as the purpose of compressing the refrigerant is achieved.
In one embodiment, the inlet pipe end of the compressor 20 is further connected with a liquid storage tank 10, and the liquid storage tank 10 is used for separating the gas-liquid mixture entering the compressor 20, so as to prevent the liquid from entering the compressor 20 and avoid damage to the compressor 20 caused by the liquid.
In one embodiment, the throttling element 60 is a bi-directional throttling element. The bidirectional throttling element is used for realizing the purpose of bidirectional throttling and depressurization in the heat exchange system 100. The refrigerant can pass through the throttling element 60 to achieve the purpose of flow regulation both in the refrigerating heat exchange loop and in the heating heat exchange loop.
In one embodiment, the throttling element 60 is an electronic expansion valve that is mounted between the indoor heat exchanger 40 and the outdoor heat exchanger 50. The electronic expansion valve comprises a sensing element (not shown), an electric control element (not shown), a valve needle assembly (not shown) and a valve body (not shown), and the electric control unit adjusts the opening degree of the valve needle assembly through an electric signal transmitted by the sensing element, so that the purpose of adjusting the flow rate of the refrigerant is achieved. The throttling and depressurization process of the electronic expansion valve is as follows: the high-pressure liquid refrigerant is throttled by the electronic expansion valve to be a low-pressure gas-liquid mixed refrigerant, and then flows to the indoor heat exchanger 40 or the outdoor heat exchanger 50. The use of an electronic expansion valve as the throttling element 60 can enhance the accuracy of controlling the flow rate of the refrigerant.
In this embodiment, the electronic expansion valve may be an electromagnetic electronic expansion valve or an electric electronic expansion valve, as long as the purpose of throttling and depressurization can be achieved.
The indoor heat exchanger 40 may be any type of indoor heat exchanger 40, such as a water-cooled type, an air-cooled type, or a water-air mixed cooling type, as long as a process of converting a refrigerant from a gas state to a liquid state (when heating) can be realized.
In the refrigerating state, the low-pressure liquid condensed liquid passes through the indoor heat exchanger 40 to exchange heat with the heat exchange medium, the vaporization absorbs heat to form a low-pressure gaseous refrigerant, the vaporization process absorbs heat, and the cooled air is blown out by the cross-flow fan, so that the refrigerating effect is achieved. The process of the heating state of the heat exchange system is opposite to the process of the refrigerating state.
In the present embodiment, the indoor heat exchanger 40 and the outdoor heat exchanger 50 are two devices for changing the refrigerant state in the cooling state of one heat exchange system 100, respectively, and the indoor heat exchanger 40 also serves as a condenser and the outdoor heat exchanger 50 also serves as an evaporator in the heating state of the heat exchange system 100, so that the indoor heat exchanger 40 and the outdoor heat exchanger 50 are heat exchange devices in the heat exchange system 100.
Further, as shown in fig. 2, the heat exchange system 100 further includes a control unit 70, where the control unit 70 includes a control module 71, a temperature detection module 72, and a time module 73, where the temperature detection module 72 is configured to detect a temperature signal of a coil of the outdoor heat exchanger 50 and transmit the corresponding temperature signal to the control module 71, and the control module 71 receives the temperature signal and controls the outdoor fan 51 to rotate according to the time signal of the time module 73.
The control module 71 is a single chip microcomputer, a PLC, an FPGA, or the like, and it is understood that the processing unit is an electronic device that can perform the above functions and is understood by those skilled in the art, and the embodiment is not limited specifically. To avoid the problem of insufficient disclosure.
Similarly, the temperature detection module 72 may be the DS18B21, the time module 73 is a timer, and it is understood that the temperature detection module 72 and the time module 73 are electronic devices that can perform the above functions as understood by those skilled in the art, and the embodiment is not limited specifically. To avoid the problem of insufficient disclosure.
Further, as shown in fig. 3, a control method based on the heat exchange system 100 includes the following steps:
controlling the heat exchange system 100 to heat and the outdoor fan 51 to rotate positively, and reversing the outdoor fan 51 when the coil temperature of the outdoor heat exchanger 50 is greater than or equal to tc1;
when the outdoor fan 51 is reversed, and when the coil temperature of the outdoor heat exchanger 50 is less than or equal to tc2, the outdoor fan 51 is stopped and then rotated forward, wherein tc2 is less than tc1;
it will be appreciated that when the heat exchange system 100 is in heating, the outdoor fan 51 rotates forward to determine whether the temperature of the coil (not shown) of the outdoor heat exchanger 50 is greater than or equal to tc1; if the requirements are met, the outdoor fan 51 is reversed, the air quantity of the outdoor heat exchanger 50 is reduced, the power of the heat exchange system 100 is correspondingly reduced, and the wind directions are opposite; if the first preset requirement is not met, the outdoor fan 51 continues to rotate in the forward direction.
When the heat exchange system 100 enters a heating working condition, judging whether the coil temperature of the outdoor heat exchanger 50 is less than or equal to tc2 or not reaches the requirement; if the requirement is met, the outdoor fan 51 stops for 5S-10S, and then the outdoor fan 51 starts to rotate positively; if the demand is not met, the outdoor fan 51 continues to reverse.
Further, when the outdoor fan 51 rotates forward, the forward rotation time of the outdoor fan 51 is controlled to be greater than or equal to T1; when the outdoor fan 51 is reversed, the reversing time of the outdoor fan 51 is controlled to be greater than or equal to T2.
It will be appreciated that when the heat exchange system 100 is in heating, the outdoor fan 51 rotates forward to determine whether the operation cycle of the outdoor fan 51 is greater than or equal to T1 and the temperature of the coil (not shown) of the outdoor heat exchanger 50 is greater than or equal to tc1; if the requirements are met, the outdoor fan 51 is reversed, the air quantity of the outdoor heat exchanger 50 is reduced, the power of the heat exchange system 100 is correspondingly reduced, and the wind directions are opposite; if the first preset requirement is not met, the outdoor fan 51 continues to rotate in the forward direction.
When the heat exchange system 100 enters a heating working condition, judging whether the running time period of the outdoor fan 51 is more than or equal to T2 and whether the coil temperature of the outdoor heat exchanger 50 is less than or equal to tc2 reaches the requirement or not; if the requirement is met, the outdoor fan 51 stops for 5S-10S, and then the outdoor fan 51 starts to rotate positively; if the demand is not met, the outdoor fan 51 continues to reverse.
The operation time periods T1 and T2 of the outdoor fan 51 are detected by the time module 73, the coil temperatures tc1 and tc2 of the outdoor heat exchanger 50 are detected by the temperature detection module 72, respectively, and then the detected data signals are transmitted to the control module 71, and the control module 71 processes the data signals and controls the outdoor fan 51 according to the processed data signals.
When the heat exchange system 100 heats, the outdoor fan 51 is controlled to rotate positively and reversely, the average power of the outdoor fan 51 is reduced, energy is saved on the basis of meeting the heating quantity requirement, and the energy efficiency requirement is met. In addition, when the heat exchange system 100 needs defrosting, the heat exchange system 100 is unchanged under the heating working condition, the outdoor fan 51 is stopped and then reversed, the frost is blown off as much as possible, and the traditional defrosting time is reduced or even eliminated as much as possible.
Further, as shown in fig. 3, when the air conditioner is heating, the method further comprises the following steps:
when the coil of the outdoor heat exchanger 50 is less than or equal to tc3, the outdoor fan 51 is stopped, the fan is stopped, the heat exchange system 100 is defrosted in the cooling mode, and tc3 is less than tc2.
It will be appreciated that the coil temperature of the outdoor heat exchanger 50 is monitored and a determination is made as to whether the coil temperature is less than or equal to tc3; if the temperature is less than or equal to tc3, the outdoor fan 51 stops rotating, the fan is not stopped, and the heat exchange system 100 is in a refrigerating mode for defrosting; if it is greater than tc3, the outdoor fan 51 continues to rotate forward.
By adjusting the four-way valve 30, the heat exchange system 100 is defrosted in the cooling mode, the coil temperature rises to tc4 or the outdoor fan 51 run time period reaches T3, and the heat exchange system 100 exits the defrost mode.
Wherein the temperature of the coil is detected by the temperature detection module 72, and then the detected data signal is sent to the control module 71, and the control module 71 processes the data signal and controls the outdoor fan 51 according to the processed data signal.
In this embodiment, tc4 is 6℃to 10℃and T3 is 450S to 500S. Preferably, tc4 is 8deg.C and T3 is 480S.
The following table sets the values for the parameters applied to the heat exchange system 100:
the other items are adjusted according to the specific conditions, and will not be described one by one.
Comparative test verification example:
from the table above, it can be seen that: the power becomes smaller when the outdoor fan 51 is reversed, and the energy efficiency ratio COP of the heat exchange system 100 is thereby improved.
(1) When nominal heating is performed, the nominal heating quantity and the energy efficiency are measured to meet the requirements of technical specifications, and the power of the outdoor fan 51 is reduced to 72.7% of the original power, so that the energy-saving effect is realized.
(2) In the nominal heating process, the condensation wind directions are opposite, at this time, the indoor heat exchanger 40 is in countercurrent during heating, the heat exchange effect is better, the energy efficiency is further improved, and the required condensation wind quantity is smaller.
(3) When the outdoor fan 51 is in nominal heating, the outdoor fan 51 runs reversely, condensed water and frost are formed on the air outlet side, the directivity is provided, the outdoor fan 51 is stopped and reversed, the air outlet side is changed into the air inlet side at the moment, the air temperature in contact with the frost forming side is increased, and the condensed water and the directivity frost can be blown off and melted as much as possible by the air temperature.
(4) The actual measurement is that the compressor rotates forward by 38Hz, the nominal heating working condition is 21.13kW, the energy efficiency ratio is 2.13, the energy efficiency ratio is 24.35kW, and the energy efficiency ratio is 2.48.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (6)
1. The control method based on the heat exchange system is characterized in that the heat exchange system comprises a control unit, the control unit comprises a control module, a temperature detection module and a time module, the temperature detection module is used for detecting a temperature signal of a coil pipe of an outdoor heat exchanger and transmitting the corresponding temperature signal to the control module, the control module receives the temperature signal, controls an outdoor fan to rotate according to the temperature signal and a time signal of the time module, controls the heat exchange system to heat and the outdoor fan to rotate positively, and reverses the outdoor fan when the temperature of the coil pipe of the outdoor heat exchanger is larger than or equal to tc1;
when the outdoor fan is reversed, stopping the outdoor fan and then rotating forward when the temperature of the coil pipe of the outdoor heat exchanger is smaller than or equal to tc2, wherein tc2 is smaller than tc1;
when the outdoor fan rotates positively, controlling the positive rotation time of the outdoor fan to be more than or equal to T1; when the outdoor fan reverses, controlling the reversing time of the outdoor fan to be more than or equal to T2;
when the temperature of the coil pipe of the outdoor heat exchanger is less than or equal to tc3, the outdoor fan stops running, the air blower is not stopped, the heat exchange system is in a refrigerating mode for defrosting, and tc3 is less than tc2;
and the temperature of the coil rises to tc4 or the defrosting time of the outdoor fan reaches T3, and the heat exchange system exits the defrosting mode.
2. The heat exchange system-based control method according to claim 1, wherein the ambient temperature is Te, and when Te is greater than 5 degrees, T1 is 5min, T2 is 30min, tc1 is 3 ℃, tc2 is 1 ℃, and tc3 is-3 ℃.
3. The heat exchange system-based control method according to claim 1, wherein the ambient temperature is Te, and when 0 < te.ltoreq.5, the T1 is 5min, the T2 is 25min, the tc1 is 1 ℃, the tc2 is-1 ℃, and the tc3 is-5 ℃.
4. The heat exchange system-based control method according to claim 1, wherein the ambient temperature is Te, and when-5 < Te is less than or equal to 0, the T1 is 5min, the T2 is 20min, the tc1 is-4 ℃, the tc2 is-6 ℃, and the tc3 is-10 ℃.
5. The heat exchange system-based control method according to claim 1, wherein the ambient temperature is Te, and when Te is less than or equal to-5, T1 is 5min, T2 is 15min, tc1 is 15 ℃, tc2 is-7 ℃, and tc3 is-13 ℃.
6. The heat exchange system-based control method according to any one of claims 1 to 5, wherein the heat exchange system comprises a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger, and a throttle element disposed between the indoor heat exchanger and the outdoor heat exchanger, the compressor, the outdoor heat exchanger, and the indoor heat exchanger forming a loop through the four-way valve, the four-way valve switching a flow direction of a refrigerant in the loop.
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