CN111829149A - Four-pipe heating unit recovery system and control method thereof - Google Patents
Four-pipe heating unit recovery system and control method thereof Download PDFInfo
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- CN111829149A CN111829149A CN202010705301.XA CN202010705301A CN111829149A CN 111829149 A CN111829149 A CN 111829149A CN 202010705301 A CN202010705301 A CN 202010705301A CN 111829149 A CN111829149 A CN 111829149A
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
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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
- F24F2140/10—Pressure
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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]
- Y02B30/56—Heat recovery units
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Abstract
The invention discloses a four-pipe heating unit recovery system and a control method thereof, and relates to the technical field of air conditioners, wherein the system comprises a fan, a plate heat exchanger, a control unit and a pressure comparison unit, wherein the condensation outlet side of the plate heat exchanger is provided with a pressure sensor for detecting condensation pressure; the control method comprises the following steps: acquiring the condensing pressure through a control unit; judging whether the condensing pressure is within a preset pressure range; if yes, generating a corresponding control signal; the control unit adjusts the rotating speed of the fan according to the control signal, so that the running state of the unit can be monitored in real time, the rotating speed of the fan can be adjusted steplessly within a certain range, and the purpose of heat recovery water outlet temperature is achieved; the problem of among the prior art adjust the fan rotational speed lag through the condensation temperature is solved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a four-pipe heating unit recovery system and a control method thereof.
Background
The four-pipe heating recovery control system is a control scheme for recovering waste heat as a reheated constant heat source during the refrigeration operation of an air-cooled cold water (heat pump) four-pipe heating recovery unit, does not need an energy storage water tank, steplessly adjusts the temperature of hot water, and provides a stable cold source and a heat source simultaneously in a purification air-conditioning refrigeration mode. At present, the rotating speed of a condensing fan is regulated in a segmented mode according to the detected environment temperature and the heat recovery water outlet temperature, so that the purposes of controlling the condensing pressure in a segmented mode and regulating and controlling the heat recovery water outlet temperature are achieved. However, the temperature sensing of the temperature sensor has hysteresis, and cannot accurately reflect the real-time requirement of the unit on the rotating speed of the fan, so the rotating speed of the fan is adjusted by sections according to the temperature, and although the rotating speed of the condensing fan can be adjusted by sections, stepless adjustment of the temperature of the heat recovery outlet water cannot be realized.
Disclosure of Invention
Aiming at the defects, the technical problems to be solved by the invention are as follows: the four-pipe heating unit recovery system and the control method thereof can achieve the purposes of monitoring the unit running state in real time, adjusting the rotating speed of a fan steplessly within a certain range and further achieving stable heat recovery water outlet.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a control method of a four-pipe heating unit recovery system is based on the four-pipe heating unit recovery system, the system comprises a fan and a plate heat exchanger, and a pressure sensor for detecting condensation pressure is arranged on a condensation outlet side of the plate heat exchanger;
the control method comprises the following steps:
acquiring condensation pressure;
judging whether the condensation pressure is within a preset pressure range or not;
if yes, generating a corresponding control signal;
and adjusting the rotating speed of the fan according to the control signal.
Preferably, the preset pressure range is composed of a pressure threshold and a pressure deviation;
the judging whether the condensing pressure is within a preset pressure range includes:
judging whether the condensing pressure is greater than or equal to a pressure threshold value and a pressure deviation;
if so, generating a corresponding control signal as a maximum control signal;
then the process of the first step is carried out,
and controlling the maximum rotating speed of the fan to operate according to the maximum control signal.
Preferably, the determining whether the condensing pressure is within a preset pressure range further includes:
judging whether the condensing pressure is greater than a pressure threshold and smaller than the sum of the pressure threshold and the pressure deviation;
if yes, generating a corresponding control signal as a proportional control signal;
then the process of the first step is carried out,
and controlling the fan to regulate the speed proportionally between the minimum rotating speed and the maximum rotating speed according to the proportional regulation control signal.
Preferably, the determining whether the condensing pressure is within a preset pressure range further includes:
judging whether the condensing pressure is greater than the difference between the pressure threshold and the pressure deviation and is less than or equal to the pressure threshold;
if yes, generating a corresponding control signal as a lowest control signal;
then the process of the first step is carried out,
and controlling the lowest rotating speed of the fan to operate according to the lowest control signal.
Preferably, the determining whether the condensing pressure is within a preset pressure range further includes:
judging whether the condensing pressure is less than or equal to the difference between the pressure threshold and the pressure deviation;
if so, generating a corresponding control signal as a closing control signal;
then the process of the first step is carried out,
and controlling the fan to be closed according to the closing control signal.
Preferably, the ratio is a ratio of a difference between the condensing pressure and the pressure threshold to a difference between the maximum rotating speed of the fan and the minimum rotating speed of the fan.
A four-pipe heating unit recovery system comprises a fan, a plate heat exchanger, a pressure sensor arranged on a condensation outlet side of the plate heat exchanger and used for detecting condensation pressure, and a control unit electrically connected with the fan and the pressure sensor respectively; the condensation device also comprises a pressure comparison unit, wherein the pressure comparison unit is used for judging whether the condensation pressure is in a preset pressure range or not; if yes, generating a corresponding control signal, and transmitting the control signal to the control unit; and the control unit steplessly adjusts the rotating speed of the fan according to the control signal.
Preferably, the pressure control device further comprises a presetting unit electrically connected with the control unit, wherein the presetting unit is used for presetting a pressure range formed by a pressure threshold value and a pressure deviation.
Preferably, the pressure comparing unit includes a first comparing unit, a second comparing unit, a third comparing unit and a fourth comparing unit, and the first comparing unit is configured to determine whether the condensing pressure is greater than or equal to a sum of a pressure threshold and a pressure deviation; if so, generating a corresponding control signal as a maximum control signal, transmitting the maximum control signal to the control unit, and controlling the maximum rotating speed of the fan to operate by the control unit; the second comparison unit is used for judging whether the condensation pressure is greater than a pressure threshold value and smaller than the sum of the pressure threshold value and the pressure deviation; if yes, generating a corresponding control signal as a proportional control signal, transmitting the proportional control signal to the control unit, and controlling the fan to regulate the speed between the minimum rotating speed and the maximum rotating speed according to the proportion by the control unit; the third comparing unit is used for judging whether the condensing pressure is larger than the difference between the pressure threshold and the pressure deviation and is smaller than or equal to the pressure threshold; if so, generating a corresponding control signal as a lowest control signal, transmitting the lowest control signal to the control unit, and controlling the low-speed operation of the fan by the control unit; the fourth comparing unit is used for judging whether the condensing pressure is smaller than or equal to the difference between a pressure threshold value and a pressure deviation; if yes, generating a corresponding control signal as a closing control signal, transmitting the closing control signal to the control unit, and controlling the fan to be closed by the control unit.
Preferably, the ratio is a ratio of a difference between the condensing pressure and the pressure threshold to a difference between the maximum rotating speed of the fan and the minimum rotating speed of the fan; and the control unit outputs corresponding voltage between 0V and 10V to the fan according to the proportion, so that the fan adjusts the speed according to the proportion.
After the technical scheme is adopted, the invention has the beneficial effects that:
the four-pipe heating unit recovery system comprises a fan, a plate heat exchanger, a control unit and a pressure comparison unit, wherein the condensation outlet side of the plate heat exchanger is provided with the pressure sensor for detecting condensation pressure; the control method comprises the following steps: acquiring the condensing pressure through a control unit; judging whether the condensing pressure is within a preset pressure range; if yes, generating a corresponding control signal; the control unit adjusts the rotating speed of the fan according to the control signal, so that the running state of the unit can be monitored in real time, the rotating speed of the fan can be adjusted steplessly within a certain range, and the purpose of heat recovery water outlet temperature is achieved; the problem of among the prior art adjust the fan rotational speed lag through the condensation temperature is solved.
Drawings
FIG. 1 is a flow chart of a method of controlling a four-pipe heat generating set recovery system according to the present invention;
FIG. 2 is a flowchart of the present embodiment;
figure 3 is a schematic block diagram of a four-tube heating unit recovery system of the present invention;
fig. 4 is a schematic structural diagram of a four-pipe heating unit recovery system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further 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 are not intended to limit the invention.
The first embodiment is as follows:
as shown in fig. 1 and 2, a control method of a four-pipe heating unit recovery system is based on the four-pipe heating unit recovery system, the system includes a fan and a plate heat exchanger, and a pressure sensor for detecting condensing pressure is arranged on a condensing outlet side of the plate heat exchanger;
the control method comprises the following steps:
step S1, acquiring condensation pressure;
step S2, judging whether the condensation pressure is in a preset pressure range;
step S3, if yes, generating a corresponding control signal;
and step S4, adjusting the rotating speed of the fan according to the control signal.
By adopting the method, the running state of the unit is monitored in real time, and the rotating speed of the fan is steplessly adjusted within a certain range, so that the aim of heat recovery of the outlet water temperature is fulfilled; the problem of among the prior art adjust the fan rotational speed lag through the condensation temperature is solved.
As shown in fig. 2, the preset pressure range is composed of a pressure threshold and a pressure deviation;
step S2 includes step S20 of determining whether the condensing pressure P is equal to or greater than the pressure threshold value Pt + pressure deviation Δ P; wherein the pressure deviation Δ P may be, but is not limited to, 0.2 MPa; the pressure threshold Pt is not limited to 2.8MPa and can be adjusted according to actual conditions.
If so, generating a corresponding control signal as a maximum control signal;
and controlling the maximum rotating speed of the fan to operate according to the maximum control signal.
The corresponding heat recovery outlet water temperature is the heat recovery outlet water temperature required by a user, when the condensing pressure P is more than or equal to the pressure threshold Pt plus the pressure deviation delta P, the actual outlet water temperature of the heat recovery is far higher than the temperature required by the user, at the moment, a fan speed regulator of the system outputs a 10V direct current voltage signal, and the fan runs at the maximum rotating speed, so that the aim of reducing the heat recovery is fulfilled.
Step S2 further includes step S21 of determining whether the condensing pressure P is greater than the pressure threshold Pt and less than the sum of the pressure threshold Pt and the pressure deviation Δ P;
if yes, generating a corresponding control signal as a proportional control signal;
and controlling the fan to proportionally regulate the speed between the minimum rotating speed and the maximum rotating speed according to the proportional regulation control signal. Wherein: the ratio is the ratio of the difference between the condensing pressure P and the pressure threshold Pt to the difference between the maximum rotating speed of the fan and the minimum rotating speed of the fan.
When the [ pressure threshold value Pt ] is less than the [ condensation pressure P ] and less than the [ pressure threshold value Pt ] + [ pressure deviation delta P ], the actual outlet water temperature of heat recovery is within the deviation range required by the outlet water temperature required by a user, and a fan speed regulator of the heat recovery system proportionally outputs 0-10V direct-current voltage signals according to the difference value of the [ condensation pressure P ] and the [ pressure threshold value Pt ], so that the rotating speed of the fan is adjusted, and the outlet water temperature of heat recovery is adjusted.
The step S2 further includes a step S22 of determining whether the condensing pressure P is greater than the difference between the pressure threshold Pt and the pressure deviation Δ P and is equal to or less than the pressure threshold;
if yes, generating a corresponding control signal as a lowest control signal;
and controlling the lowest rotating speed of the fan to operate according to the lowest control signal.
When [ pressure threshold Pt ] - [ pressure deviation delta P ] - [ condensation pressure P ] is less than or equal to [ pressure threshold Pt ], the actual effluent temperature of heat recovery is slightly lower than the required effluent temperature, and the fan operates at the lowest rotating speed at the moment, so that the aims of improving heat recovery and heat recovery effluent temperature are fulfilled
The step S2 further includes a step S23 of determining whether the condensing pressure P is equal to or less than the difference between the pressure threshold Pt and the pressure deviation Δ P;
if so, generating a corresponding control signal as a closing control signal;
and controlling the fan to be closed according to the closing control signal.
When the pressure threshold Pt is larger than or equal to the condensing pressure P, the actual outlet water temperature of the heat recovery is far lower than the required temperature, the fan is turned off at the moment, the heat is recovered completely, the heat can not be dissipated at the fin radiator basically, and the heat is completely used for plate heat exchange recovery to produce hot water.
In conclusion, by adopting the control method, the rotating speed of the fan is accurately and steplessly adjusted in real time according to the condensation pressure acquired in real time, the effect of heat recovery outlet water temperature is realized, the problem that the temperature can not be accurately adjusted due to the lagging of the temperature acquired by the temperature sensor is solved, and the method is simple and easy to operate and low in cost.
Example two:
as shown in fig. 3, a four-pipe heating unit recovery system includes a fan, a plate heat exchanger, a pressure sensor disposed at a condensation outlet side of the plate heat exchanger for detecting a condensation pressure, and a control unit electrically connected to the fan and the pressure sensor, respectively; the condensation pressure control device also comprises a pressure comparison unit, wherein the pressure comparison unit is used for judging whether the condensation pressure is in a preset pressure range or not; if yes, generating a corresponding control signal, and transmitting the control signal to the control unit; the control unit adjusts the rotating speed of the fan in a stepless manner according to the control signal. The control unit comprises a fan speed regulator, a frequency converter or a variable frequency drive, wherein the fan speed regulator is used for detecting a pressure signal and outputting a direct current voltage signal corresponding to 0-10V according to the pressure signal, and the frequency converter or the variable frequency drive is used for receiving the voltage signal of 0-10V and adjusting the output frequency of the fan according to the voltage signal of 0-10V.
The present example also includes a presetting unit electrically connected to the control unit, the presetting unit being configured to preset a pressure range composed of a pressure threshold and a pressure deviation.
The pressure comparison unit comprises a first comparison unit, a second comparison unit, a third comparison unit and a fourth comparison unit, and the first comparison unit is used for judging whether the condensation pressure is greater than or equal to the sum of the pressure threshold and the pressure deviation; if so, generating a corresponding control signal as a maximum control signal, transmitting the maximum control signal to a control unit, and controlling the maximum rotating speed of the fan to operate by the control unit; the second comparison unit is used for judging whether the condensing pressure is greater than the pressure threshold value and smaller than the sum of the pressure threshold value and the pressure deviation; if yes, generating a corresponding control signal as a proportional control signal, transmitting the proportional control signal to a control unit, and controlling the fan to regulate the speed between the minimum rotating speed and the maximum rotating speed according to the proportion by the control unit; wherein, the proportion is the ratio of the difference between the condensing pressure and the pressure threshold value to the difference between the maximum rotating speed of the fan and the minimum rotating speed of the fan; and the control unit outputs corresponding voltage between 0V and 10V to the fan according to the proportion, so that the fan adjusts the speed according to the proportion. The third comparing unit is used for judging whether the condensing pressure is greater than the difference between the pressure threshold and the pressure deviation and is less than or equal to the pressure threshold; if so, generating a corresponding control signal as a lowest control signal, transmitting the lowest control signal to a control unit, and controlling the low-speed operation of the fan by the control unit; the fourth comparing unit is used for judging whether the condensing pressure is less than or equal to the difference between the pressure threshold and the pressure deviation; if so, generating a corresponding control signal as a closing control signal, transmitting the closing control signal to the control unit, and controlling the fan to be closed by the control unit.
In the four-pipe heating unit recovery system, the condensing pressure acquired by the pressure sensor during refrigeration is converted into a corresponding electric signal rotating speed to the control unit, the control unit can be but is not limited to an ST32M10 series single chip microcomputer, the control unit compares the condensing pressure with the first comparison unit, the second comparison unit, the third comparison unit and the fourth comparison unit, when the condensing pressure falls into a corresponding pressure range, the pressure comparison unit generates a corresponding control signal, the control signal is transmitted to the control unit, and the control unit outputs a corresponding 0-10V voltage to the fan, so that the aim of adjusting the rotating speed of the fan in real time to stabilize the water outlet temperature is fulfilled, and the rotating speed of the fan is adjusted in a stepless manner within a certain range. The invention adjusts the rotating speed of the fan in real time according to the condensing pressure, thereby solving the problem that the rotating speed of the fan cannot be accurately adjusted due to temperature lag.
As shown in fig. 4, the four-pipe heating unit recycling system has the following circulation: the air exhaust of the compressor 1 → the four-way reversing valve 2 → the finned condenser 3 → the heat recovery plate heat exchanger 4 → the liquid storage tank 5 → the electronic expansion valve 6 (throttling device) → the evaporator 7 → the four-way reversing valve 2 → the gas-liquid separator 9 → the air return of the compressor 1.
When the temperature of the heat recovery water is higher than the requirement, the rotating speed of the fan 10 is increased until the fan runs at the highest rotating speed, the heat exchange amount of the finned condenser 3 is increased, and then the heat exchange amount of the heat recovery plate type heat exchanger 4 is reduced, so that the temperature of the heat recovery water is reduced.
When the temperature of the heat recovery water is lower than the requirement, the rotating speed of the fan 10 is reduced until the fan is turned off, the heat exchange amount of the finned condenser 3 is reduced, and then the heat exchange amount of the heat recovery plate type heat exchanger 4 is increased, so that the temperature of the heat recovery water is increased, when the temperature reaches the requirement temperature, the condensing pressure P also reaches a corresponding preset pressure range, namely [ pressure threshold value P ] < [ condensing pressure P ] < [ pressure threshold value P ] + [ pressure deviation Delta P ], and at the moment, the fan 10 runs in proportion between the minimum rotating speed and the maximum rotating speed.
The above-described preferred embodiments of the present invention are not intended to limit the present invention, and any modifications, equivalent improvements, etc. of the four-pipe heat recovery system and the control method thereof, which are made within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (10)
1. The control method of the four-pipe heating unit recovery system is characterized in that based on the four-pipe heating unit recovery system, the system comprises a fan and a plate heat exchanger, and a pressure sensor for detecting condensation pressure is arranged on the condensation outlet side of the plate heat exchanger;
the control method comprises the following steps:
acquiring condensation pressure;
judging whether the condensation pressure is within a preset pressure range or not;
if yes, generating a corresponding control signal;
and adjusting the rotating speed of the fan according to the control signal.
2. The control method of a four-pipe heat generating unit recovery system according to claim 1, wherein the preset pressure range is constituted by a pressure threshold and a pressure deviation;
the judging whether the condensing pressure is within a preset pressure range includes:
judging whether the condensing pressure is greater than or equal to a pressure threshold value and a pressure deviation;
if so, generating a corresponding control signal as a maximum control signal;
then the process of the first step is carried out,
and controlling the maximum rotating speed of the fan to operate according to the maximum control signal.
3. The method of claim 2, wherein the determining whether the condensing pressure is within a preset pressure range further comprises:
judging whether the condensing pressure is greater than a pressure threshold and smaller than the sum of the pressure threshold and the pressure deviation;
if yes, generating a corresponding control signal as a proportional control signal;
then the process of the first step is carried out,
and controlling the fan to regulate the speed proportionally between the minimum rotating speed and the maximum rotating speed according to the proportional regulation control signal.
4. The method of claim 2, wherein the determining whether the condensing pressure is within a preset pressure range further comprises:
judging whether the condensing pressure is greater than the difference between the pressure threshold and the pressure deviation and is less than or equal to the pressure threshold;
if yes, generating a corresponding control signal as a lowest control signal;
then the process of the first step is carried out,
and controlling the lowest rotating speed of the fan to operate according to the lowest control signal.
5. The method of claim 2, wherein the determining whether the condensing pressure is within a preset pressure range further comprises:
judging whether the condensing pressure is less than or equal to the difference between the pressure threshold and the pressure deviation;
if so, generating a corresponding control signal as a closing control signal;
then the process of the first step is carried out,
and controlling the fan to be closed according to the closing control signal.
6. The control method of the four-pipe heating unit recovery system according to claim 3, wherein the ratio is a ratio of a difference between a condensing pressure and a pressure threshold to a difference between a maximum rotation speed of the fan and a minimum rotation speed of the fan.
7. The four-pipe heating unit recovery system is characterized by comprising a fan, a plate heat exchanger, a pressure sensor and a control unit, wherein the pressure sensor is arranged on the condensation outlet side of the plate heat exchanger and used for detecting condensation pressure, and the control unit is electrically connected with the fan and the pressure sensor respectively; the condensation device also comprises a pressure comparison unit, wherein the pressure comparison unit is used for judging whether the condensation pressure is in a preset pressure range or not; if yes, generating a corresponding control signal, and transmitting the control signal to the control unit; and the control unit steplessly adjusts the rotating speed of the fan according to the control signal.
8. The four-tube heating unit recovery system according to claim 7, further comprising a presetting unit electrically connected to the control unit, the presetting unit being configured to preset a pressure range consisting of a pressure threshold and a pressure deviation.
9. The four-pipe heat generating unit recovery system according to claim 8, wherein the pressure comparison unit includes a first comparison unit, a second comparison unit, a third comparison unit, and a fourth comparison unit,
the first comparison unit is used for judging whether the condensation pressure is greater than or equal to the sum of a pressure threshold and a pressure deviation; if so, generating a corresponding control signal as a maximum control signal, transmitting the maximum control signal to the control unit, and controlling the maximum rotating speed of the fan to operate by the control unit;
the second comparison unit is used for judging whether the condensation pressure is greater than a pressure threshold value and smaller than the sum of the pressure threshold value and the pressure deviation; if yes, generating a corresponding control signal as a proportional control signal, transmitting the proportional control signal to the control unit, and controlling the fan to regulate the speed between the minimum rotating speed and the maximum rotating speed according to the proportion by the control unit;
the third comparing unit is used for judging whether the condensing pressure is larger than the difference between the pressure threshold and the pressure deviation and is smaller than or equal to the pressure threshold; if so, generating a corresponding control signal as a lowest control signal, transmitting the lowest control signal to the control unit, and controlling the low-speed operation of the fan by the control unit;
the fourth comparing unit is used for judging whether the condensing pressure is smaller than or equal to the difference between a pressure threshold value and a pressure deviation; if yes, generating a corresponding control signal as a closing control signal, transmitting the closing control signal to the control unit, and controlling the fan to be closed by the control unit.
10. The four-tube heating unit recovery system according to claim 9, wherein the ratio is a ratio of a difference between a condensing pressure and a pressure threshold to a difference between a maximum fan speed and a minimum fan speed;
and the control unit outputs corresponding voltage between 0V and 10V to the fan according to the proportion, so that the fan adjusts the speed according to the proportion.
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| CN112283870B (en) * | 2020-10-30 | 2021-11-23 | 广东Tcl智能暖通设备有限公司 | Air conditioner outdoor unit control method and system and computer readable storage medium |
| CN113587262A (en) * | 2021-07-26 | 2021-11-02 | 珠海格力电器股份有限公司 | Outdoor unit, air conditioning system and control method thereof |
| CN113587262B (en) * | 2021-07-26 | 2022-07-08 | 珠海格力电器股份有限公司 | Outdoor unit, air conditioning system and control method thereof |
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