CN110017568B - Fan coil anti-freezing control method and device and air conditioner - Google Patents

Fan coil anti-freezing control method and device and air conditioner Download PDF

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Publication number
CN110017568B
CN110017568B CN201910315131.1A CN201910315131A CN110017568B CN 110017568 B CN110017568 B CN 110017568B CN 201910315131 A CN201910315131 A CN 201910315131A CN 110017568 B CN110017568 B CN 110017568B
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coil
fan coil
fan
temperature data
state
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CN110017568A (en
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李翱翔
黄坤鹏
王义祥
杨东林
阳紫娟
王鹏帅
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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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
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • 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
    • 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
    • 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
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The embodiment of the invention provides a fan coil anti-freezing control method and device and an air conditioner, and relates to the technical field of air conditioners. The fan coil anti-freezing control method comprises the following steps: and under the power-on state of the fan coil and the starting or standby state of the fan coil, controlling the opening and closing state of a water valve of the fan coil according to the measured data of the fan coil so as to prevent chilled water from flowing into the coil of the fan coil or enable a water medium in the coil of the fan coil to circulate. The fan coil anti-freezing control method, the fan coil anti-freezing control device and the air conditioner provided by the embodiment of the invention can effectively control the anti-freezing of the fan coil, improve the use reliability of the fan coil, prevent the coil from freezing due to improper use and influence on use, avoid the frost cracking and water leakage of the coil and prolong the service life of the fan coil.

Description

Fan coil anti-freezing control method and device and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a fan coil anti-freezing control method and device and an air conditioner.
Background
The fan coil is an air conditioning system end device composed of fan blades, a motor, a coil and the like, is widely applied to the field of heating ventilation air conditioning, and is the most common indoor air conditioning end device at present. The fan drives indoor air to exchange heat with chilled water or hot water (medium) flowing through the coil pipe, so that the refrigerating/heating function is realized.
The fan coil has multiple types and wide application range. But at present, most air conditioner products in the market do not effectively control the fan coil or optimize the anti-freezing mode, so that the fan coil is easy to freeze and the use is influenced.
Disclosure of Invention
The invention solves the problems that the air conditioner cannot effectively control the anti-freezing of the fan coil and the fan coil is easy to freeze.
In order to solve the above problem, an embodiment of the present invention provides an anti-freezing control method for a fan coil, including: when a fan coil is in a power-on state and the fan coil is in a starting or standby state, the opening and closing state of a water valve of the fan coil is controlled according to measured data of the fan coil, so that chilled water is prevented from flowing into the coil of the fan coil or water media in the coil of the fan coil are circulated.
According to the fan coil anti-freezing control method provided by the embodiment of the invention, the opening and closing state of the water valve of the fan coil is controlled according to the measured data of the fan coil, when the water valve is closed, the chilled water is prevented from flowing into the coil of the fan coil, so that the chilled water is prevented from freezing in the coil, or in another state, the opening of the water valve can be controlled, so that the water medium in the coil of the fan coil circulates, and the anti-freezing is realized by forming circulation through the water medium in the coil. Therefore, the fan coil anti-freezing control method can effectively control the anti-freezing of the fan coil, improves the use reliability of the fan coil, prevents the coil from freezing due to improper use and influencing the use, can avoid the freezing and water leakage of the coil, and prolongs the service life of the fan coil.
Further, the measured data of the fan coil comprises indoor temperature data and coil temperature data of the fan coil;
the step of controlling the opening and closing state of a water valve of the fan coil according to the measured data of the fan coil in the power-on state of the fan coil and in the starting or standby state of the fan coil comprises the following steps:
and controlling the opening and closing state of the water valve according to the indoor temperature data and the coil temperature data of the fan coil when the fan coil is in the power-on state and the fan coil is in the standby state.
Further, the step of controlling the open/close state of the water valve according to the indoor temperature data and the coil temperature data of the fan coil in the power-on state of the fan coil and in the standby state of the fan coil includes:
judging whether the indoor temperature data in a continuous preset time interval is less than or equal to a first indoor temperature and greater than a second indoor temperature or not and whether the coil temperature data in the continuous preset time interval is less than or equal to the first coil temperature and greater than the second coil temperature or not in a power-on state of the fan coil and in a standby state of the fan coil;
and if the indoor temperature data is less than or equal to the first indoor temperature and greater than a second indoor temperature, and the coil temperature data is less than or equal to the first coil temperature and greater than the second coil temperature, controlling the water valve to be opened so as to enable the water medium in the coil of the fan coil to circulate.
Further, the step of controlling the open/close state of the water valve according to the indoor temperature data and the coil temperature data of the fan coil in the power-on state of the fan coil and in the standby state of the fan coil includes:
and if the indoor temperature data is less than or equal to the second indoor temperature and the coil temperature data is less than or equal to the second coil temperature, controlling the water valve to maintain a closed state and controlling a fan of the fan coil to be started.
Further, after the step of controlling the water valve to maintain a closed state and controlling the fan of the fan coil to be turned on, the method further includes:
and controlling the electric heating device of the fan coil to be started.
Further, after the step of controlling the electric heating device of the fan coil to be turned on, the method further comprises the following steps:
judging whether the starting time of the electric heating device is greater than or equal to a first preset starting time or not;
and if the time for starting the electric heating device is greater than or equal to the first preset starting time, controlling the electric heating device to be closed.
Further, after the step of controlling the electric heating device of the fan coil to be turned on, the method further comprises the following steps:
if the starting time of the electric heating device is less than the first preset starting time, judging whether the starting time of the electric heating device is more than or equal to a second preset starting time and less than the first preset starting time;
if the starting time of the electric heating device is greater than or equal to the second preset starting time and less than the first preset starting time, judging whether the coil temperature data is greater than or equal to a third coil temperature;
if the coil temperature data is greater than or equal to the third coil temperature, controlling the electric heating device to be closed;
and if the coil temperature data is less than the third coil temperature, controlling to maintain the electric heating device to be started.
Further, after the step of controlling the electric heating device of the fan coil to be turned on, the method further comprises the following steps:
and if the starting time of the electric heating device is less than the second preset starting time, controlling to keep the electric heating device started.
Further, the measured data of the fan coil comprises coil temperature data of the fan coil;
the step of controlling the opening and closing state of a water valve of the fan coil according to measured data of the fan coil in the power-on state of the fan coil and in the starting or standby state of the fan coil comprises the following steps:
and controlling the opening and closing state of the water valve according to the coil temperature data of the fan coil when the fan coil is in the power-on state and the fan coil is in the power-on state.
Further, the step of controlling the open/close state of the water valve according to the coil temperature data of the fan coil when the fan coil is in the power-on state and the fan coil is in the power-on state includes:
judging whether the temperature data of the coil in a continuous preset time interval is less than or equal to the temperature of a fourth coil or not when the fan coil is in a power-on state and the fan coil is in a power-on state;
and if the coil temperature data is less than or equal to the fourth coil temperature, controlling the water valve to be closed.
Further, after the step of controlling the water valve to close, the method further includes:
and if the coil temperature data is less than or equal to the fourth coil temperature, controlling a fan of the fan coil to delay preset delay control time after the water valve is closed to execute fan control logic.
The embodiment of the invention also provides a fan coil anti-freezing control device, which comprises: the control module is used for controlling the opening and closing state of a water valve of the fan coil according to the measured data of the fan coil so as to prevent chilled water from flowing into the coil of the fan coil or enable an aqueous medium in the coil of the fan coil to circulate.
The fan coil anti-freezing control device provided by the embodiment of the invention can effectively control the anti-freezing of the fan coil, improves the use reliability of the fan coil, prevents the coil from freezing due to improper use and influencing the use, can avoid the freezing and water leakage of the coil, and prolongs the service life of the fan coil.
The embodiment of the invention also provides an air conditioner which comprises the fan coil, wherein the fan coil is provided with a controller, and the controller can execute any one of the fan coil anti-freezing control methods.
The air conditioner provided by the embodiment of the invention can effectively control the anti-freezing of the fan coil, improves the use reliability of the fan coil, prevents the coil from freezing due to improper use and influences the use, can avoid frost cracking and water leakage of the coil, and prolongs the service life of the fan coil.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of the fan coil of FIG. 1;
FIG. 3 is a schematic flow chart of a fan coil anti-freezing control method according to an embodiment of the invention;
FIG. 4 is a schematic flow chart illustrating a fan coil anti-freeze control method according to another embodiment of the invention;
FIG. 5 is a schematic control flow diagram of an electric heating device of the fan coil anti-freezing control method according to the embodiment of the invention;
FIG. 6 is a flow chart illustrating a fan coil anti-freeze control method according to another embodiment of the invention.
Description of reference numerals:
10-an air conditioner; 100-fan coil; 210-a return air box; 220-a second air duct; 230-air filter net; 240-lower return air grille; 310-a first air duct; 320-an air outlet grid; 400-electric heating means; 500-indoor temperature sensor; 600-coil temperature sensor; 110-coiled tubing; a 120-water valve; 130-a water inlet pipe; 140-a water outlet pipe; 150-controller.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1-2, embodiments of the present invention provide a fan coil anti-freezing control method, a fan coil anti-freezing control device and an air conditioner 10. The fan coil anti-freezing control method and device are applied to the air conditioner 10.
The air conditioner 10 may be a central air conditioner. The air conditioner 10 includes a fan coil 100, a return air box 210, a second air duct 220, an air filter screen 230, a lower return air grill 240, a first air duct 310, and an outlet air grill 320. Wherein, the one end of fan coil 100 is connected with air-out grid 320 through first tuber pipe 310, and the other end of fan coil 100 is connected with return air case 210, and return air case 210 is connected with lower return air grid 240 through second tuber pipe 220, and air cleaner screen 230 sets up in lower return air grid 240. An electric heating device 400 and an indoor temperature sensor 500 are arranged at a return air inlet between the second air pipe 220 and the return air box 210, wherein the electric heating device 400 is used for assisting in electric heating of return air, the indoor temperature sensor 500 is used for detecting indoor temperature, and further indoor temperature data are obtained by detecting the return air temperature at the return air inlet.
The fan coil 100 includes a coil 110, a fan (not shown) in communication with the first air duct 310 and the return air duct 210, a water valve 120, an inlet tube 130, an outlet tube 140, and a controller 150. The water inlet pipe 130 and the water outlet pipe 140 are respectively connected with the coil pipe 110, and the water valve 120 is disposed on the water inlet pipe 130. The coil 110 is provided with a coil temperature sensor 600 for detecting the temperature of the coil, and further obtaining the temperature data of the coil by detecting the temperature of the water in the coil 110. Alternatively, coil temperature sensor 600 may be located at the first U-shaped tube at the inlet of coil 110. The controller 150 is electrically connected to the indoor temperature sensor 500 and the coil temperature sensor 600, respectively, and is configured to receive indoor temperature data detected by the indoor temperature sensor 500 and coil temperature data detected by the coil temperature sensor 600. The controller 150 is also electrically connected to the blower, the water valve 120 and the electric heating device 400, respectively, for controlling the operation of the blower, the water valve 120 and the electric heating device 400. In addition, the water valve 120 may be an electrically driven three-way solenoid valve or a two-way solenoid valve, or may be an electrically driven ball valve, which can control the on/off of the water path. The controller 150 has an interface that can control the opening and closing of the water valve 120. The water valve 120 of this embodiment is an electromagnetic three-way valve.
The controller 150 is capable of executing the fan coil freeze protection control method described above. The fan coil freeze protection control includes at least one software function module that may be stored in the controller 150 in the form of software or firmware and executed by the controller 150.
Referring to fig. 3, the fan coil anti-freezing control method includes the following steps:
step S100, in a power-on state of the fan coil 100 and a starting or standby state of the fan coil 100, controlling the opening and closing state of the water valve 120 of the fan coil 100 according to the measured data of the fan coil 100 to prevent chilled water from flowing into the coil 110 of the fan coil 100 or enable the water medium in the coil 110 of the fan coil 100 to circulate.
In addition, the fan coil anti-freezing control method can realize anti-freezing through the opening and closing state of the water valve 120 of the fan coil 100 when the fan coil 100 is in the power-on state and the fan coil 100 is in the power-on or standby state. The present embodiment will be specifically described with the fan coil 100 in the power-on state and the fan coil 100 in the standby state.
It should be appreciated that in the event that the fan coil 100 is on standby for a long period of time in winter, when there is no power-on requirement (the user is out or out for a long time), the coil 110 is easily damaged if the temperature of the aqueous medium in the coil 110 is low and there is no circulation flow and the aqueous medium is easily frozen due to low indoor temperature. In step S100, the unit state of the fan coil 100 is detected while the fan coil 100 is in the energized state, and the measured data of the fan coil 100 is received when the fan coil 100 is in the standby state. And the opening and closing state of the water valve 120 of the fan coil 100 is controlled according to the measured data of the fan coil 100, so as to realize freeze prevention.
In step S100, the measured data of the fan coil 100 may include indoor temperature data (denoted as TA) and coil temperature data (denoted as TB) of the fan coil 100. Indoor temperature data TA is obtained by detecting the return air temperature at the return air inlet through indoor temperature sensor 500, and coil temperature data TB is obtained by detecting the temperature of water in coil 110 through coil temperature sensor 600, then step S100 may include: when the fan coil 100 is powered on and the fan coil 100 is in a standby state, the open/close state of the water valve 120 is controlled according to the indoor temperature data and the coil temperature data of the fan coil 100.
That is, in the present embodiment, the indoor temperature data and the coil temperature data are used as the basis for determination of control while the fan coil 100 is in the power-on state and the fan coil 100 is in the standby state. This can improve the judgment accuracy. The standby condition in winter or summer can be indirectly reflected through the indoor temperature data. The condition of misjudgment caused by taking the temperature data of the coil pipe as a judgment basis when the device is standby in summer (or the indoor temperature is high) is prevented, so that the judgment accuracy is ensured.
Referring to fig. 4, in a power-on state of the fan coil 100 and a standby state of the fan coil 100, the step of controlling the open/close state of the water valve 120 according to the indoor temperature data and the coil temperature data of the fan coil 100 may include the following sub-steps:
in the substep S110, when the fan coil 100 is in the power-on state and the fan coil 100 is in the standby state, it is determined whether the indoor temperature data in the continuous preset time interval is less than or equal to the first indoor temperature and greater than the second indoor temperature, and whether the coil temperature data in the continuous preset time interval is less than or equal to the first coil temperature and greater than the second coil temperature.
The continuous preset time interval is a preset connection time interval, and may be, for example, 30 s. The first indoor temperature and the second indoor temperature are different indoor temperature values which are set according to actual needs, wherein the first indoor temperature is larger than the second indoor temperature. The first coil temperature and the second coil temperature are different coil temperature values and are set according to actual needs, wherein the first coil temperature is larger than the second coil temperature. In this embodiment, the first indoor temperature may be 5 ℃ and the second indoor temperature may be 2 ℃; the first coil temperature may be 10 deg.c and the second coil temperature may be 5 deg.c. Judging whether the detected indoor temperature data within 30s meets TA more than 2 ℃ and less than or equal to 5 ℃ and the coil temperature data meets TB more than 5 ℃ and less than or equal to 10 ℃.
And a substep S120 of controlling the water valve 120 to open to circulate the aqueous medium in the coil 110 of the fan coil 100 if the indoor temperature data is less than or equal to the first indoor temperature and greater than the second indoor temperature and the coil temperature data is less than or equal to the first coil temperature and greater than the second coil temperature.
It should be noted that, if the indoor temperature data is less than or equal to the first indoor temperature and greater than the second indoor temperature, and the coil temperature data is less than or equal to the first coil temperature and greater than the second coil temperature, this working condition is not the most prone freezing condition, and only the water medium is circulated to prevent freezing. Antifreeze control for this condition may be referred to as primary antifreeze.
In the embodiment, the indoor temperature data detected within 30s continuously meets TA (timing advance) of more than 2 ℃ and is less than or equal to 5 ℃, and the coil temperature data meets TB of more than 5 ℃ and is less than or equal to 10 ℃, the first-stage anti-freezing control is performed, and the water valve 120 is controlled to be opened, so that the water medium in the coil 110 of the fan coil 100 circulates.
In the substep S130, if the indoor temperature data is less than or equal to the second indoor temperature and the coil temperature data is less than or equal to the second coil temperature, the water valve 120 is controlled to maintain the closed state, and the fan of the fan coil 100 is controlled to be turned on.
It should be noted that, if the indoor temperature data is less than or equal to the second indoor temperature and the coil temperature data is less than or equal to the second coil temperature, the working condition is worse, the water in the coil 110 is more easily frozen, and the freezing cannot be effectively prevented only by the flow of the aqueous medium. Freeze protection control for this condition may be referred to as secondary freeze protection.
At this time, the water valve 120 is controlled to maintain a closed state to prevent the low temperature aqueous medium from flowing into the coil 110 to circulate. And controlling the fan to be turned on, optionally, after the water valve 120 is turned off, the fan may be turned on after a certain time delay, for example, 3min delay, and the fan is turned on to execute the fan control logic. In this way, an effective turn-on condition can be provided for the auxiliary electric heating of the electric heating device 400 to turn on the electric heating device 400 to warm up the coil 110, preventing freezing. In addition, the circulation of the low-temperature aqueous medium flowing into the coil 110 can be avoided, so that the coil 110 cannot meet the coil temperature condition required for turning off the electric auxiliary heat.
Referring to fig. 5, in the present embodiment, if the indoor temperature data detected within 30 seconds satisfies TA is less than or equal to 2 ℃, and the coil temperature data satisfies TB is less than or equal to 5 ℃, the second-stage anti-freezing control is performed. After the sub-step S130, the control method further includes:
step S200, controlling the electric heater 400 of the fan coil 100 to be turned on.
Under the control of secondary anti-freezing, the temperature of the aqueous medium stored in the coil pipe 110 is raised by the electric heating device 400 to prevent freezing. Optionally, the electric heating device 400 is turned on after the blower is turned on for a period of time, for example, 5 s.
In step S210, it is determined whether the time for turning on the electric heating apparatus 400 is greater than or equal to a first preset turning on time.
The first preset starting time is set time and can be correspondingly set according to time requirements. Optionally, the first preset on-time is 5 min.
In step S220, if the time for turning on the electric heating apparatus 400 is greater than or equal to the first preset turning on time, the electric heating apparatus 400 is controlled to be turned off.
Therefore, the electric heating effect can be ensured, freezing is prevented, and energy consumption can be saved.
In step S230, if the time for turning on the electric heating apparatus 400 is less than the first preset turning-on time, it is determined whether the time for turning on the electric heating apparatus 400 is greater than or equal to the second preset turning-on time and less than the first preset turning-on time.
The second preset starting time is set time and can be correspondingly set according to time requirements, and the second preset starting time is smaller than the first preset starting time. In this embodiment, the second preset on-time is 3 min.
In step S240, if the time for turning on the electric heating device 400 is greater than or equal to the second preset turning-on time and less than the first preset turning-on time, it is determined whether the coil temperature data is greater than or equal to the third coil temperature.
It should be noted that, if the time for turning on the electric heating apparatus 400 is less than the second preset turning on time, step S250 is executed to control to keep turning on the electric heating apparatus 400.
In step S240, the third coil temperature is the set coil temperature, which is the off condition temperature of the electric heating apparatus 400. In this embodiment, the third coil temperature may be 20 ℃. During the judgment, whether the coil temperature data detected in the continuous time is greater than or equal to the third coil temperature is judged, and in the embodiment, whether the coil temperature data detected in the continuous time meets the condition that TB is greater than or equal to 20 ℃ is judged.
If the coil temperature data is greater than or equal to the third coil temperature, step S220 is executed to control the electric heating device 400 to be turned off. In this embodiment, if the coil temperature data satisfies TB ≥ 20 ℃, the electric heating apparatus 400 is controlled to be turned off.
In step S250, if the coil temperature data is less than the third coil temperature, the electric heating device 400 is controlled to be turned on.
After step S250, the fan control logic is executed after a delay of a certain time (windshield change or shutdown), for example, after a delay of 10S. The fan can blow away the surface waste heat of the electric heating device 400 after delaying a period of time, and the heat of electric heating is fully utilized. And then returns to the substep S110 to continue the detection judgment.
Referring to fig. 4, in step S300, if the indoor temperature data in the continuous preset time interval is greater than the first indoor temperature, or the coil temperature data in the continuous preset time interval is greater than the first coil temperature, the fan coil 100 is controlled to normally operate.
Referring to fig. 6, in another embodiment of the present invention, the fan coil anti-freezing control method can achieve anti-freezing by opening and closing the water valve 120 of the fan coil 100 when the fan coil 100 is in the power-on standby state and the fan coil 100 is in the power-on standby state. The following description will be specifically made in a state where the fan coil 100 is energized and the fan coil 100 is turned on.
The measured data of the fan coil 100 includes coil temperature data of the fan coil 100, and it can be understood that in step S100, the open/close state of the water valve 120 is controlled according to the coil temperature data of the fan coil 100 in the power-on state of the fan coil 100 and in the power-on state of the fan coil 100.
The fan coil anti-freezing control method can comprise the following steps:
step S400, judging whether the coil temperature data in the continuous preset time interval is less than or equal to the fourth coil temperature or not when the fan coil 100 is in the power-on state and the fan coil 100 is in the power-on state.
It should be noted that, in the power-on state of the fan coil 100 and in the power-on state of the fan coil 100, only the coil temperature data may be used as the basis for the determination. The condition that the temperature that can be applicable to entering coil pipe 110 is crossed lowly, for example under the refrigeration demand condition in summer, the frostproofing control at this moment is used for avoiding the temperature too low to lead to the air-out temperature to cross lowly, influences the use comfort, also can avoid the temperature freezing when crossing lowly.
The continuous preset time interval is a set connection time interval, and is set according to actual needs, for example, 30 s. The fourth coil temperature is a set coil temperature value, which may be set to 5 degrees celsius, for example. In this example, it is determined whether the coil temperature data detected for 30 seconds satisfies TB ≦ 5 ℃.
In step S410, if the coil temperature data is less than or equal to the fourth coil temperature, the water valve 120 is controlled to be closed. The water valve 120 is closed and the flow of the low temperature chilled water into the coil 110 is inhibited. Furthermore, the fan coil 100 reports a "water temperature too low" fault.
In step S410, if the coil temperature data is less than or equal to the fourth coil temperature, the fan of the fan coil 100 is controlled to execute the fan control logic after the water valve 120 is closed and the preset delay control time is delayed. The preset delay control time is a set delay time, and may be, for example, 3 min. And after the water valve 120 is closed and 3min is delayed, controlling the fan to execute fan control logic. The temperature of water existing in the coil pipe 110 is low, and the water temperature is increased by exchanging heat with indoor air, so that freezing is avoided.
In step S420, if the coil temperature data is greater than the fifth coil temperature, the fan coil 100 is controlled to resume the mode operation before the failure. The fifth coil temperature is a set coil temperature value, for example, the fifth coil temperature may be set to 8 ℃, and the fifth coil temperature is greater than the fourth coil temperature. And if the detected coil temperature data of 30 seconds continuously meets the condition that TB is more than or equal to 8 ℃, the fault is eliminated, and the mode operation before the fault is recovered.
When the fault is triggered 3 times in an hour, the non-power-off cannot be recovered. After 3 times of accumulated faults (accumulated faults are more, the working condition is unstable, and the fan coil 100 needs to be repaired) are accumulated for one hour, the fan coil 100 does not automatically recover to operate after the fault recovery is detected, and the fan coil can continue to operate only after the power failure and the restart.
The fan coil anti-freezing control device provided by the embodiment of the invention can comprise a control module, wherein the control module is used for controlling the opening and closing state of the water valve 120 of the fan coil 100 according to the measured data of the fan coil 100 so as to prevent chilled water from flowing into the coil 110 of the fan coil 100 or enable the water medium in the coil 110 of the fan coil 100 to circulate. It should be understood that the steps of the fan coil freeze protection control method described above may all be performed by the control module.
In summary, according to the fan coil anti-freezing control method, the fan coil anti-freezing control device and the air conditioner 10, the open/close state of the water valve 120 of the fan coil 100 is controlled according to the measured data of the fan coil 100, when the water valve 120 is closed, the chilled water is prevented from flowing into the coil 110 of the fan coil 100, so that the chilled water is prevented from freezing in the coil 110, or, in another state, the water valve 120 can be controlled to be opened, so that the water medium in the coil 110 of the fan coil 100 circulates, and the water medium in the coil 110 forms a circulation to realize anti-freezing. Therefore, the fan coil anti-freezing control method can effectively control the anti-freezing of the fan coil 100, improves the use reliability and comfort of the fan coil 100, prevents the coil 110 from freezing due to improper use and influences use, can avoid the freezing and water leakage of the coil 110, and prolongs the service life of the fan coil 100.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (9)

1. A fan coil anti-freezing control method is characterized by comprising the following steps:
controlling the opening and closing state of a water valve of a fan coil according to measured data of the fan coil when the fan coil is in a power-on state and the fan coil is in a starting or standby state so as to prevent chilled water from flowing into the coil of the fan coil or enable an aqueous medium in the coil of the fan coil to circulate;
the measured data of the fan coil comprises indoor temperature data and coil temperature data of the fan coil;
the step of controlling the opening and closing state of a water valve of the fan coil according to the measured data of the fan coil in the power-on state of the fan coil and in the starting or standby state of the fan coil comprises the following steps:
controlling the opening and closing state of the water valve according to the indoor temperature data and the coil temperature data of the fan coil when the fan coil is in a power-on state and the fan coil is in a standby state;
the step of controlling the open-close state of the water valve according to the indoor temperature data and the coil temperature data of the fan coil in the powered state of the fan coil and in the standby state of the fan coil comprises the following steps:
judging whether the indoor temperature data in a continuous preset time interval is less than or equal to a first indoor temperature and greater than a second indoor temperature or not and whether the coil temperature data in the continuous preset time interval is less than or equal to the first coil temperature and greater than the second coil temperature or not in a power-on state of the fan coil and in a standby state of the fan coil;
if the indoor temperature data is less than or equal to the first indoor temperature and greater than a second indoor temperature, and the coil temperature data is less than or equal to the first coil temperature and greater than the second coil temperature, controlling the water valve to be opened so as to enable the water medium in the coil of the fan coil to circulate;
if the indoor temperature data is less than or equal to the second indoor temperature and the coil temperature data is less than or equal to the second coil temperature, controlling the water valve to maintain a closed state so as to prevent low-temperature aqueous medium from flowing into the coil circulation of the fan coil and controlling the fan of the fan coil to be started;
and controlling the electric heating device of the fan coil to be started.
2. A fan coil freeze control method as set forth in claim 1 wherein said step of controlling the electrical heating means of the fan coil to turn on is followed by the further steps of:
judging whether the starting time of the electric heating device is greater than or equal to a first preset starting time or not;
and if the time for starting the electric heating device is greater than or equal to the first preset starting time, controlling the electric heating device to be closed.
3. A fan coil freeze control method as set forth in claim 2 wherein said step of controlling the electrical heating means of the fan coil to turn on is followed by the further steps of:
if the starting time of the electric heating device is less than the first preset starting time, judging whether the starting time of the electric heating device is more than or equal to a second preset starting time and less than the first preset starting time;
if the starting time of the electric heating device is greater than or equal to the second preset starting time and less than the first preset starting time, judging whether the coil temperature data is greater than or equal to a third coil temperature;
if the coil temperature data is greater than or equal to the third coil temperature, controlling the electric heating device to be closed;
and if the coil temperature data is less than the third coil temperature, controlling to maintain the electric heating device to be started.
4. A fan coil freeze control method as set forth in claim 3 wherein said step of controlling the electrical heating means of the fan coil to turn on is followed by the further steps of:
and if the starting time of the electric heating device is less than the second preset starting time, controlling to keep the electric heating device started.
5. A fan coil freeze control method as described in claim 1, wherein said measured fan coil data comprises coil temperature data for said fan coil;
the step of controlling the opening and closing state of a water valve of the fan coil according to measured data of the fan coil in the power-on state of the fan coil and in the starting or standby state of the fan coil comprises the following steps:
and controlling the opening and closing state of the water valve according to the coil temperature data of the fan coil when the fan coil is in the power-on state and the fan coil is in the power-on state.
6. A fan coil freeze control method as recited in claim 5, wherein said step of controlling the on and off states of said water valve in accordance with fan coil temperature data for said fan coil in the fan coil on state comprises:
judging whether the temperature data of the coil in a continuous preset time interval is less than or equal to the temperature of a fourth coil or not when the fan coil is in a power-on state and the fan coil is in a power-on state;
and if the coil temperature data is less than or equal to the fourth coil temperature, controlling the water valve to be closed.
7. A fan coil freeze control method as set forth in claim 6 further comprising, after said step of controlling said water valve to close:
and if the coil temperature data is less than or equal to the fourth coil temperature, controlling a fan of the fan coil to delay preset delay control time after the water valve is closed to execute fan control logic.
8. The utility model provides a fan coil freeze control device which characterized in that includes:
the control module is used for controlling the opening and closing state of a water valve of the fan coil according to the measured data of the fan coil so as to prevent chilled water from flowing into the coil of the fan coil or enable an aqueous medium in the coil of the fan coil to circulate;
the measured data of the fan coil comprises indoor temperature data and coil temperature data of the fan coil;
the control module is also used for controlling the opening and closing state of the water valve according to the indoor temperature data and the coil temperature data of the fan coil when the fan coil is in a power-on state and the fan coil is in a standby state;
the control module is further configured to determine whether the indoor temperature data in a continuous preset time interval is less than or equal to a first indoor temperature and greater than a second indoor temperature, and whether the coil temperature data in the continuous preset time interval is less than or equal to the first coil temperature and greater than the second coil temperature, in a power-on state of the fan coil and in a standby state of the fan coil;
the control module is further configured to control the water valve to open to circulate an aqueous medium in a coil of the fan coil if the indoor temperature data is less than or equal to the first indoor temperature and greater than a second indoor temperature and the coil temperature data is less than or equal to the first coil temperature and greater than the second coil temperature;
the control module is further configured to control the water valve to maintain a closed state if the indoor temperature data is less than or equal to the second indoor temperature and the coil temperature data is less than or equal to the second coil temperature, so as to prevent a low-temperature aqueous medium from flowing into a coil circulation of the fan coil and control a fan of the fan coil to be turned on;
the control module is also used for controlling the opening of the electric heating device of the fan coil.
9. An air conditioner comprising a fan coil, wherein the fan coil has a controller that is capable of performing the fan coil freeze protection control method of any of claims 1-7.
CN201910315131.1A 2019-04-18 2019-04-18 Fan coil anti-freezing control method and device and air conditioner Active CN110017568B (en)

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CN110986281B (en) * 2019-11-04 2021-02-02 珠海格力电器股份有限公司 Automatic anti-freezing control method for multi-connected cold-hot water heat pump unit and air conditioning system thereof
CN111750486B (en) * 2020-06-17 2022-07-19 宁波奥克斯电气股份有限公司 Control method and device for preventing indoor unit from freezing and air conditioner
CN114216215B (en) * 2021-11-19 2023-04-25 珠海格力电器股份有限公司 Antifreezing control method and device for water system and related equipment

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