CN116907061A - Control method and control system of fresh air handling unit - Google Patents
Control method and control system of fresh air handling unit Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000010438 heat treatment Methods 0.000 claims abstract description 62
- 238000007710 freezing Methods 0.000 claims description 51
- 230000036760 body temperature Effects 0.000 claims description 22
- 238000004590 computer program Methods 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000007664 blowing Methods 0.000 claims description 14
- 230000008014 freezing Effects 0.000 claims description 13
- 238000003303 reheating Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
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- 238000007789 sealing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
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Classifications
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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
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
-
- 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
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Fluid Mechanics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application relates to a control method and a control system of a fresh air unit, and relates to the technical field of fresh air systems, wherein the control method comprises the following steps: collecting first temperature data of fresh air at an air inlet of a cross flow heat exchanger; judging whether the first temperature data is smaller than a first temperature threshold value or not; if the first temperature data is smaller than the first temperature threshold value, heating through a surface cooler to preheat fresh air flowing through the cross flow heat exchanger; and if the first temperature data is not smaller than the first temperature threshold value, sending the fresh air to the surface cooler, and heating the fresh air through the surface cooler. The application has the effect of avoiding the surface cooler from being frozen and cracked by the fresh air with low temperature.
Description
Technical Field
The application relates to the technical field of fresh air systems, in particular to a control method and a control system of a fresh air unit.
Background
The fresh air handling unit is an air conditioning apparatus that provides fresh air. The working principle is that fresh air is extracted outdoors and is sent indoors through a fan after being subjected to dust removal, dehumidification or humidification, temperature rise or temperature reduction and other treatments, and the original indoor air is replaced when the fresh air enters an indoor space.
The related art discloses a fresh air handling unit, which comprises a box body, air intake and air outlet have been seted up to the relative both sides of box, the box is located air intake department and fixedly is provided with first effect filter, first effect filter cover establishes the air intake, one side that is close to the air intake in the box is provided with surface cooler and heat exchanger, one side that is close to the air outlet of box is provided with centrifugal fan, and centrifugal fan's air outlet and box's air outlet intercommunication, wherein, surface cooler and heat exchanger often can let in liquid medium and carry out the heat transfer to the air.
According to the related technology, heat can be conducted into the air of the box body through the surface cooler and the high-temperature medium in the heat exchanger, the temperature of the air in the box body is increased, the air is sent into a room through the centrifugal fan, however, in some areas in north of China, the temperature can reach-22 ℃ in cold weather, at the moment, the cold air enters the box body, the surface cooler is easily frozen and cracked, the fresh air handling unit is difficult to work normally, and improvement is needed.
Disclosure of Invention
The application aims to provide a control method and a control system for a fresh air handling unit, which are used for preheating fresh air entering the fresh air handling unit in advance and avoiding frost cracking of a surface cooler.
In a first aspect, the present application provides a control method for a fresh air handling unit, which adopts the following technical scheme:
a control method of a fresh air handling unit comprises the following steps:
collecting first temperature data of fresh air at an air inlet of a cross flow heat exchanger;
judging whether the first temperature data is smaller than a first temperature threshold value or not;
if the first temperature data is smaller than the first temperature threshold value, heating through a surface cooler to preheat fresh air flowing through the cross flow heat exchanger;
and if the first temperature data is not smaller than the first temperature threshold value, sending the fresh air to the surface cooler, and heating the fresh air through the surface cooler.
Through adopting above-mentioned technical scheme, through gathering first temperature data to judge whether first temperature data is less than first temperature threshold value, and then, when first temperature data is less than first temperature threshold value, preheat the new trend with the help of cross flow heat exchanger, with the temperature of promoting the new trend, thereby can avoid the surface cooler to be frozen by the new trend of low temperature and split.
Optionally, after the heat is supplied by the surface cooler to preheat the fresh air flowing through the cross flow heat exchanger, the method further comprises:
collecting second temperature data of fresh air at an air outlet of the cross flow heat exchanger;
judging whether the second temperature data is not smaller than the first temperature threshold value or not;
if the second temperature data is not smaller than the first temperature threshold value, the preheated fresh air is sent to the surface cooler, and the fresh air is heated through the surface cooler;
if the second temperature data is smaller than the first temperature threshold value, increasing the opening of a water valve of the surface air cooler, sending out alarm information, and closing a fan and a fresh air closed air valve.
Through adopting above-mentioned technical scheme, through gathering second temperature data to judge whether second temperature data is not less than first temperature threshold value, and then, when second temperature data is less than first temperature threshold value, increase the water valve aperture of surface cooler, in order to promote the temperature of new trend, send alarm information simultaneously, close fan and the airtight blast gate of new trend, thereby can further avoid the surface cooler to be frozen by the new trend of low temperature and split.
Optionally, after the fresh air is heated by the surface air cooler, the method further comprises:
the heated fresh air is heated again through a heat exchanger;
collecting third temperature data of the fresh air after reheating;
judging whether the third temperature data is not smaller than a second temperature threshold value or not;
if the third temperature data is not smaller than the second temperature threshold value, increasing the blowing power of the fan, and blowing the reheated fresh air into a room through the fan;
and if the third temperature data is smaller than the second temperature threshold value, increasing the heat supply temperature of the heat exchanger, and reducing the blowing power of the fan so as to blow the reheated fresh air into a room through the fan.
Through adopting above-mentioned technical scheme, through gathering third temperature data, and judge whether third temperature data is not less than the second temperature threshold value, and then, when third temperature data is not less than the second temperature threshold value, increase the power of blowing of fan, then blow the new trend after reheating to indoor through the fan, be less than the second temperature threshold value at third temperature data, increase the heat supply temperature of heat exchanger, and reduce the power of blowing of fan, then blow the new trend after reheating to indoor through the fan, thereby can guarantee the temperature of the new trend that flows to indoor.
Optionally, a heating coil is disposed in the heat exchanger, and the heating coil is used for reheating the fresh air, which specifically includes:
monitoring the tube body temperature of the heating coil in real time;
switching a temperature control target according to the temperature of the pipe body and a preset anti-freezing protection temperature threshold value;
and adjusting the medium flow of the heating coil according to the current temperature control target so as to enable the measured temperature corresponding to the current temperature control target to reach the target temperature.
By adopting the technical scheme, the temperature control target is switched according to the pipe body temperature and the preset anti-freezing protection temperature threshold value, and then the medium flow of the heating coil is regulated according to the current temperature control target, so that the actual measurement temperature corresponding to the current temperature control target reaches the target temperature, and the correspondence between the actual measurement temperature and the target temperature can be ensured.
Optionally, the switching the temperature control target according to the pipe body temperature and a preset anti-freezing protection temperature threshold specifically includes:
comparing the tube body temperature with the preset anti-freezing protection temperature threshold value to determine a section where the tube body temperature is located;
and switching the temperature control target according to the determined interval.
By adopting the technical scheme, the section where the tube body temperature is located can be determined by comparing the tube body temperature with the preset anti-freezing protection temperature threshold value, and then the temperature control target is switched according to the determined section, so that the temperature control target is conveniently switched.
Optionally, the switching the temperature control target according to the determined interval specifically includes:
if the pipe body temperature is greater than or equal to the sum of the preset anti-freezing protection temperature threshold value and the preset value and lasts for a preset time, switching to a first temperature control target, wherein the measured temperature corresponding to the first temperature control target is room temperature, and the target temperature is user-set temperature;
if the pipe body temperature is smaller than or equal to the preset anti-freezing protection temperature threshold value and lasts for the preset time, switching to a second temperature control target, wherein the measured temperature corresponding to the second temperature control target is the pipe body temperature, and the target temperature is the preset anti-freezing protection temperature threshold value;
and if the temperature of the pipe body is larger than the preset anti-freezing protection temperature threshold value and smaller than the sum of the preset anti-freezing protection temperature threshold value and the preset value and lasts for the preset time, keeping the temperature control target which is determined last time unchanged.
Through adopting above-mentioned technical scheme, through judging the relation between body temperature, the anti-freezing protection temperature threshold value of predetermineeing and the default, the convenience takes corresponding measure in order to guarantee the indoor temperature of flow direction.
Optionally, the heating coil is connected with a medium inflow pipeline, a heat supply control valve is arranged on the medium inflow pipeline, and the medium flow of the heating coil is adjusted according to the current temperature control target, and the heating coil specifically comprises:
if the measured temperature is greater than the target temperature, reducing the opening of the heat supply control valve;
if the measured temperature is equal to the target temperature, maintaining the current opening of the heating control valve;
and if the measured temperature is smaller than the target temperature, increasing the opening degree of the heat supply control valve.
By adopting the technical scheme, the opening degree of the heat supply control valve is adjusted according to the comparison condition of the actually measured temperature and the target temperature, so that the indoor temperature can be further ensured.
In a second aspect, the present application provides a control system for a fresh air handling unit, which adopts the following technical scheme:
a control system for a fresh air handling unit, comprising:
the acquisition module is used for acquiring first temperature data of fresh air at the air inlet of the cross flow heat exchanger;
the judging module is used for judging whether the first temperature data is smaller than a first temperature threshold value or not;
the first execution module is used for supplying heat through the surface cooler to preheat the fresh air flowing through the cross flow heat exchanger when the first temperature data is smaller than the first temperature threshold value;
and the second execution module is used for sending the fresh air to the surface cooler and heating the fresh air through the surface cooler when the first temperature data is not smaller than the first temperature threshold value.
Through adopting above-mentioned technical scheme, gather first temperature data through collection module to judge whether first temperature data is less than first temperature threshold value through judging the module, and then, when first temperature data is less than first temperature threshold value with the help of first execution module, preheat the new trend through the cross flow heat exchanger, with the temperature that promotes the new trend, thereby can avoid the surface cooler to be frozen by low temperature new trend and split.
In a third aspect, the present application provides a terminal, which adopts the following technical scheme:
a terminal comprising a memory, a processor and a computer program stored in the memory and capable of running on the processor, the processor performing the method of the first aspect when the computer program is loaded by the processor.
By adopting the technical scheme, the method of the first aspect generates a computer program and stores the computer program in the memory to be loaded and executed by the processor, so that a user can establish a connection with a control system of the fresh air handling unit through the terminal and inquire about various contents processed by the system.
In a fourth aspect, the present application provides a computer readable storage medium, which adopts the following technical scheme:
a computer readable storage medium having stored therein a computer program which, when loaded by a processor, performs the method of the first aspect.
By adopting the technical scheme, the method of the first aspect generates a computer program and stores the computer program in a computer readable storage medium, and after the computer readable storage medium is loaded into any computer, any computer can execute the method of the first aspect.
Drawings
FIG. 1 is a schematic diagram of a fresh air handling unit according to an embodiment of the present application;
FIG. 2 is a flow chart of the method of step S1-step S4 in the embodiment of the application;
FIG. 3 is a flow chart of the method of step S5-step S8 in an embodiment of the present application;
FIG. 4 is a flowchart of the method of step S9-step S13 in an embodiment of the present application;
FIG. 5 is a flow chart of the method of step S14-step S16 in an embodiment of the present application;
FIG. 6 is a flowchart of a method from step S151 to step S152 in an embodiment of the present application;
FIG. 7 is a flow chart of the method of steps S1521-S1523 in the embodiment of the application;
FIG. 8 is a flow chart of the method of step S17-step S19 in an embodiment of the present application;
FIG. 9 is a block diagram of the control system of the fresh air bank in an embodiment of the application;
in the figure, 1, a shell; 11. a fresh air inlet; 12. fresh air outlet; 13. a baffle plate; 14. an air intake compartment; 141. a wind deflector; 142. a surface cooler; 143. a cross flow heat exchanger; 144. a first expansion valve; 15. an air supply compartment; 151. a first heat exchanger; 152. a heat recovery condenser; 153. a blower; 154. a second expansion valve; 155. a third expansion valve; 2. a compressor; 3. a second heat exchanger; 4. an acquisition module; 5. a judging module; 6. a first execution module; 7. and a second execution module.
Detailed Description
The present application will be described in further detail with reference to fig. 1 to 9.
The application discloses a control method of a fresh air handling unit, which mainly describes the use process of the fresh air handling unit in winter.
Referring to fig. 1, the embodiment of the application discloses a fresh air handling unit, which comprises a housing 1, wherein the length direction of the housing 1 is horizontally arranged, a fresh air inlet 11 and a fresh air outlet 12 are respectively formed on two sides of the length direction of the housing 1, the fresh air inlet 11 is located outdoors, and the fresh air outlet 12 is located indoors.
Wherein, the middle part in the casing 1 is fixed with baffle 13, and baffle 13 is vertical setting, and the week side of baffle 13 is the upper and lower lateral wall of butt casing 1 respectively and the two lateral walls on width direction, and the one side that is located baffle 13 in the casing 1 and is close to fresh air intake 11 is formed with air inlet compartment 14, and the one side that is located baffle 13 in the casing 1 and is close to fresh air outlet 12 is formed with air supply compartment 15, and the vent 131 has been seted up at the middle part of baffle 13.
Wherein, be provided with deep bead 141, surface cooler 142 and cross flow heat exchanger 143 in the air inlet compartment 14, surface cooler 142 intercommunication has the heat medium circulation pipeline, and install first expansion valve 144 on the heat medium circulation pipeline for control heat medium circulation pipeline switch-on, during the concrete application, outdoor new trend gets into in the air inlet compartment 14 from new trend air intake 11, then carries out preheating treatment to the new trend through cross flow heat exchanger 143, then carries out heating treatment to the new trend after preheating through surface cooler 142, the new trend after the heating is carried in again through cross flow heat exchanger 143 and vent 131 to the air supply compartment 15.
The air supply compartment 15 is internally provided with a first heat exchanger 151, a heat recovery condenser 152 and a fan 153, wherein the first heat exchanger 151 is communicated with the heat recovery condenser 152, a communication pipeline between the first heat exchanger 151 and the heat recovery condenser 152 is provided with a second expansion valve 154 and a third expansion valve 155, the second expansion valve 154 and the third expansion valve 155 are used for controlling the communication pipeline between the first heat exchanger 151 and the heat recovery condenser 152 to be communicated, and when the air supply compartment is specifically applied, heated fresh air is reheated through the first heat exchanger 151 and finally sent into a room through the fan 153.
Wherein, the outside of casing 1 is provided with compressor 2 and second heat exchanger 3, and one side of first heat exchanger 151 communicates with compressor 2, and the opposite side of first heat exchanger 151 communicates with one side of heat recovery condenser 152 and second heat exchanger 3 respectively, and the opposite side of second heat exchanger 3 communicates with compressor 2.
Further, in cold weather, the second expansion valve 154 is opened, the third expansion valve 155 is closed, the compressor 2, the first heat exchanger 151, the second expansion valve 154 and the second heat exchanger 3 are matched, the fresh air is subjected to heat exchange through the first heat exchanger 151, and the temperature of the fresh air is raised. And on a hot day, the second expansion valve 154 is closed, the third expansion valve 155 is opened, the compressor 2, the second heat exchanger 3, the heat recovery condenser 152 and the third expansion valve 155 are matched with the first heat exchanger 151, and the fresh air is subjected to heat exchange through the first heat exchanger 151 so as to reduce the temperature of the fresh air.
The embodiment of the application discloses a control method of a fresh air handling unit, which specifically comprises the following steps with reference to fig. 2:
s1: and collecting first temperature data of fresh air at an air inlet of the cross flow heat exchanger.
In one embodiment of the application, a high-precision temperature sensor is arranged at the air inlet of the cross flow heat exchanger, and further first temperature data at the air inlet of the cross flow heat exchanger are acquired in real time by means of the high-precision temperature sensor.
S2: it is determined whether the first temperature data is less than a first temperature threshold.
The first temperature threshold in this embodiment is set to 2 ℃, and of course, the set value of the first temperature threshold may be adjusted accordingly according to the actual use situation; and further judging whether the first temperature data acquired in the step S1 is less than 2 ℃.
S3: and if the first temperature data is smaller than the first temperature threshold value, heating through the surface cooler to preheat the fresh air flowing through the cross flow heat exchanger.
In one embodiment of the application, the surface cooler is connected with a hot water flow pipeline, so that the surface cooler can be used for heating the fresh air flowing through, and the cross flow heat exchanger is used for preheating the fresh air, so that when the first temperature data is less than 2 ℃, the fresh air heated by the surface cooler enters the cross flow heat exchanger, and the fresh air just entering the cross flow heat exchanger can be preheated, so that the temperature of the fresh air reaches 2 ℃ or more, and the surface cooler can be prevented from freezing and cracking.
S4: and if the first temperature data is not smaller than the first temperature threshold value, sending the fresh air to the surface air cooler, and heating the fresh air through the surface air cooler.
In one embodiment of the present application, when the first temperature data is greater than or equal to 2 ℃, that is, in a range that can be tolerated by the surface cooler, the fresh air is directly sent to the surface cooler for heating.
In one embodiment of the present application, referring to fig. 3, after the surface cooler supplies heat to preheat the fresh air flowing through the cross flow heat exchanger, the method may further include the steps of:
s5: and collecting second temperature data of fresh air at an air outlet of the cross flow heat exchanger.
In one embodiment of the application, a high-precision temperature sensor is arranged at the air outlet of the cross flow heat exchanger, and further second temperature data at the air outlet of the cross flow heat exchanger are acquired in real time by means of the high-precision temperature sensor.
S6: it is determined whether the second temperature data is not less than the first temperature threshold.
Wherein, judge whether the second temperature data that gathers in step S5 is not less than 2 ℃.
S7: and if the second temperature data is not smaller than the first temperature threshold value, sending the preheated fresh air to the surface cooler, and heating the fresh air through the surface cooler.
In one embodiment of the application, when the second temperature data is greater than or equal to 2 ℃, the surface cooler is further ensured not to be frozen and cracked, and the preheated fresh air is sent to the surface cooler for heating.
S8: if the second temperature data is smaller than the first temperature threshold value, increasing the opening of a water valve of the surface air cooler, sending out alarm information, and closing the fan and the fresh air sealing air valve.
In one embodiment of the application, when the second temperature data is less than 2 ℃, the opening degree of the water valve of the surface air cooler can be controlled to be increased so that a large amount of hot water flows into the surface air cooler, the temperature of fresh air heated by the surface air cooler can be increased, the temperature of the cross flow heat exchanger can be further increased, the fresh air flowing through the cross flow heat exchanger can be preheated at a large temperature, and meanwhile, the fresh air unit sends out alarm information, and the fan and the fresh air sealing air valve are closed to prevent the surface air cooler from being frozen.
The surface cooler can be further prevented from being frost broken by collecting second temperature data of fresh air at the air outlet of the cross flow heat exchanger.
In one embodiment of the present application, referring to fig. 4, after the fresh air is heated by the surface cooler, the method may further include the following steps:
s9: and reheating the heated fresh air through a heat exchanger.
In one embodiment of the application, the heat exchanger is a first heat exchanger in the fresh air unit, and the heat exchanger is communicated with a hot water pipeline, so that fresh air flowing through the heat exchanger is heated again through the hot water pipeline.
S10: and collecting third temperature data of the fresh air after reheating.
In one embodiment of the application, a high-precision temperature sensor is arranged at the air outlet of the heat exchanger, and then third temperature data of the reheated fresh air is acquired in real time by means of the high-precision temperature sensor.
S11: and judging whether the third temperature data is not smaller than the second temperature threshold value.
The second temperature threshold in this embodiment is a user-set temperature, for example, any value in 25-28 ℃, and determines whether the third temperature data collected in step S10 is not less than the user-set temperature.
S12: if the third temperature data is not smaller than the second temperature threshold value, increasing the blowing power of the fan, and blowing the reheated fresh air into a room through the fan.
In one embodiment of the present application, when the third temperature data is greater than or equal to the user set temperature, the blowing power of the blower may be increased to increase the blowing amount of the blower, and then the reheated fresh air is blown into the room through the blower.
S13: if the third temperature data is smaller than the second temperature threshold value, the heat supply temperature of the heat exchanger is increased, and the blowing power of the blower is reduced, so that the reheated fresh air is blown into a room through the blower.
In one embodiment of the present application, when the third temperature data is less than the user set temperature, the opening degree of the hot water management in the heat exchanger may be increased to raise the heat supply temperature of the heat exchanger, thereby raising the temperature of the fresh air flowing through the heat exchanger, and simultaneously reducing the blowing power of the blower, so as to blow the reheated fresh air into the room through the blower.
In one embodiment of the present application, referring to fig. 5, a heating coil is disposed in a heat exchanger, and the heating coil is used to reheat fresh air, where the heat exchanger in this embodiment is the first heat exchanger in the fresh air handling unit, and specifically includes the following steps:
s14: the body temperature of the heating coil is monitored in real time.
In one embodiment of the application, a high-precision temperature sensor is arranged on the heating coil, so that the temperature of the tube body of the heating coil can be acquired in real time by adopting the high-precision temperature sensor.
S15: and switching the temperature control target according to the temperature of the pipe body and a preset anti-freezing protection temperature threshold value.
In one embodiment of the present application, the preset freezing protection temperature threshold is a lower limit value of the freezing protection temperature of the coil, and whether the heating coil has a freezing crack risk can be determined through the preset freezing protection temperature threshold.
In one embodiment of the present application, referring to fig. 6, step S15 specifically includes the following steps:
s151: comparing the tube body temperature with a preset anti-freezing protection temperature threshold value to determine the section where the tube body temperature is located.
S152: and switching the temperature control target according to the determined interval.
In one embodiment of the application, the temperature control target is switched by comparing the temperature of the pipe body with a preset antifreezing temperature threshold value, so that the antifreezing of the coil pipe and the temperature control can be realized.
In one embodiment of the present application, referring to fig. 7, step S152 specifically includes the following steps:
s1521: if the temperature of the pipe body is greater than or equal to the sum of the preset anti-freezing protection temperature threshold value and the preset value and lasts for the preset time, switching to a first temperature control target, wherein the measured temperature corresponding to the first temperature control target is the room temperature, and the target temperature is the user set temperature.
S1522: if the temperature of the pipe body is smaller than or equal to the preset anti-freezing protection temperature threshold value and lasts for the preset time, switching to a second temperature control target, wherein the measured temperature corresponding to the second temperature control target is the temperature of the pipe body, and the target temperature is the preset anti-freezing protection temperature threshold value.
S1523: if the temperature of the pipe body is larger than the preset anti-freezing protection temperature threshold value and smaller than the sum of the preset anti-freezing protection temperature threshold value and the preset value and lasts for the preset time, the temperature control target determined last time is kept unchanged.
The preset time in this embodiment may be set according to actual situations, for example, the preset time may be set to any value in 3-60s, and further erroneous judgment may be avoided by setting the preset time.
The preset value in the embodiment can be set according to the scale and the heat load characteristics of different fresh air units, for example, the preset value can be set to 0.5-5 ℃, and then the preset value is set to participate in the switching of the temperature control targets, so that the temperature gradient between the air outlet temperature of the fresh air unit and the room temperature can be ensured to be reasonable when the fresh air unit operates according to the second temperature control target, the control precision of the fresh air unit on the room temperature is about +/-2 ℃, and if the temperature gradient is too small, the temperature control targets are frequently switched to cause unstable temperature control; if the temperature gradient is too large, the transition interval is too large, so that the temperature control hysteresis of the room is easy to be caused, and the smaller the preset value is, the higher the temperature control precision is on the basis of ensuring the stable switching of the temperature control targets as much as possible.
The intelligent temperature control target is switched based on the temperature of the pipe, so that the fresh air handling unit can pre-judge the freezing prevention of the coil pipe in advance, the protection shutdown caused by too small medium flow when the room is under low load is avoided, and the comfortable and accurate temperature control of the room can be realized directly according to the dynamic load change of the room temperature.
S16: and adjusting the medium flow of the heating coil according to the current temperature control target so as to enable the measured temperature corresponding to the current temperature control target to reach the target temperature.
Wherein, in one embodiment of the present application, the temperature control target includes: the measured temperature and the corresponding target temperature are the measured value of the temperature parameter to be controlled, and the target temperature is the target value of the temperature parameter to be controlled. For example, the measured temperature is a room temperature, and the target temperature is a user-set temperature; the measured temperature is the tube body temperature of the heating coil, and the target temperature is a preset anti-freezing protection temperature threshold.
The heating coil heats air through the heating medium, the temperature of the tube body of the heating coil can be changed by adjusting the flow of the heating medium of the heating coil, the freezing prevention of the coil is realized, and the air outlet temperature of the fresh air handling unit can be changed, so that the room temperature is regulated and controlled.
When the heating device is used for heating, the temperature of the pipe body of the heating coil is monitored, the temperature control target is automatically switched according to the temperature of the pipe body and the preset anti-freezing protection temperature threshold value, the medium flow of the heating coil is adjusted according to the current temperature control target, so that the measured temperature corresponding to the current temperature control target reaches the target temperature, the target temperature is the preset anti-freezing protection temperature threshold value or the user set temperature, the anti-freezing control of the coil of the fresh air unit is combined with the room temperature control, the heating coil automatically prevents freezing and automatically tracks the room temperature change, the temperature control precision is improved on the basis of meeting the coil freezing, the room temperature comfort is ensured, and the problems that the number of devices required by the coil freezing of the fresh air unit is large and the temperature control precision of the fresh air unit is poor are solved.
In one embodiment of the present application, referring to fig. 8, a medium inflow pipe is connected to the heating coil, wherein a heat supply control valve is disposed on the medium inflow pipe, and the medium flow of the heating coil is adjusted according to a current temperature control target, and specifically includes the following steps:
and S17, if the measured temperature is greater than the target temperature, reducing the opening degree of the heat supply control valve.
S18: and if the measured temperature is equal to the target temperature, maintaining the current opening of the heat supply control valve.
S19: if the measured temperature is less than the target temperature, the opening degree of the heat supply control valve is increased.
In one embodiment of the present application, the opening of the heat supply control valve is controlled to adjust the medium flow of the heating coil, and the heat supply control valve in this embodiment is the second expansion valve of the fresh air handling unit.
The opening degree of the heating control valve is adjusted according to the current temperature control target, for example, by proportional integral control or proportional integral derivative control, and the embodiment can quickly adjust the opening degree of the heating control valve, so as to adjust the medium flow rate of the heating coil.
The conventional heating medium comprises hot water and saturated high-temperature steam with the pressure of 0.3MPa, and the inside of the coil pipe is water medium after heating, so that the temperature of the tube pipe of the heating coil pipe is required to be higher than 0 ℃, the preset anti-freezing protection temperature threshold value is higher than 0 ℃ in consideration of the safety margin, if the preset anti-freezing protection temperature threshold value is set to be too small, the anti-freezing protection failure easily occurs due to too small opening of the heat supply control valve, and the room temperature is uncomfortable to control due to too low air supply temperature; if the preset anti-freezing protection temperature threshold value is set too large, anti-freezing failure cannot be caused, but when the load of a room is small, the temperature of the air supply is too high, and the temperature control of the room is uncomfortable.
The preset anti-freezing protection temperature threshold in the embodiment can be set to any value of 3-45 ℃, and meanwhile, the preset anti-freezing protection temperature threshold is larger than or equal to a user set temperature of-7 ℃ and smaller than or equal to a user set temperature of +15 ℃, and the range of the user set temperature is generally 10-30 ℃ when heating in winter, so that anti-freezing control and room temperature control precision can be effectively considered.
According to the control method of the fresh air unit, the self-preheating technology of the fresh air unit is adopted to enable the temperature of air before entering the heating coil to be more than 3 ℃, so that the coil can be effectively prevented from freezing, the fresh air unit adopts low-temperature hot water of 50-60 ℃, the fresh air requirement at the outdoor environment temperature of-22 ℃ can be met, electric heating preheating is not needed, antifreeze solution is not needed, the equipment structure is simple, the installation and the debugging are convenient, and the control method can be widely applied to office buildings, schools, exhibition halls, stadiums, theatres, libraries, hotel halls and the like in severe cold and cold areas.
The fresh air unit can adapt to an extremely cold outdoor environment at the temperature of minus 22 ℃ and is directly connected with low-temperature hot water, so that freezing trouble is avoided; the fresh air handling unit shell adopts an integral foaming sandwich structure, the outer plate adopts professional anti-corrosion treatment, the inner plate is a galvanized plate, a waterproof and fireproof hard polyurethane heat insulation material with excellent heat insulation performance is filled between two layers of steel plates, the heat insulation performance is good, the heat insulation of the panel is high-pressure polyurethane foaming with the density of 50kg/m, and the thickness of the standard panel is 30mm; the fan adopts a low-noise direct-connected outer rotor centrifugal fan, and has the characteristics of double-side air inlet, small volume, large air quantity, stable operation, low noise and large full pressure; the high-efficiency self-preheating core body is made of hydrophilic aluminum foil, the 90-degree cross flow design is adopted, the air channel is supported by adopting a stamping convex round body, the strength and the tightness are high, the self-preheating core body can ensure that the temperature of fresh air after being preheated is higher than 3 ℃, and the anti-freezing requirement is met; by adopting the front-back low-temperature water heater, the air supply temperature can reach 24 ℃ under the condition of outdoor temperature of minus 22 ℃ in winter, and indoor equipment does not need to bear fresh air load; the fresh air unit can be optionally matched with an electrode steam humidifier, so that the humidification requirement in winter is met; and the fresh air unit adopts an intelligent PLC liquid crystal control screen, adopts an RS485 communication mode, supports a modbus communication protocol, and can realize functions of hot water valve regulation and control, temperature monitoring, fresh air valve and fan control, building automatic control connection and the like.
In one embodiment of the application, the intelligent PLC liquid crystal control screen can adjust the opening of the water valve of the heat exchanger in real time according to the air supply temperature, can set an intelligent timing operation mode and a holiday mode, and can realize the timing alarm reminding function of the filter screen.
The implementation principle of the embodiment of the application is as follows: through the temperature of real-time supervision cross flow heat exchanger air intake department to judge whether the temperature of air intake department is less than preset temperature threshold value, and when the temperature of air intake department is less than preset temperature threshold value, heat supply is carried out the thermal treatment with the new trend that flows through cross flow heat exchanger through the surface cooler, and then preheats the new trend through cross flow heat exchanger, in order to promote the temperature of new trend, thereby can avoid the surface cooler to be frozen by the new trend of low temperature and split.
The embodiment of the application discloses a control system of a fresh air handling unit, referring to FIG. 9, comprising an acquisition module 4, a judging module 5, a first executing module 6 and a second executing module 7; the method comprises the steps that first temperature data of fresh air at an air inlet of a cross flow heat exchanger are collected by means of a collecting module 4; judging whether the first temperature data is smaller than a first temperature threshold value by means of the judging module 5; when the first temperature data is smaller than a first temperature threshold value by means of the first execution module 6, heating by the surface cooler to preheat the fresh air flowing through the cross flow heat exchanger; and when the first temperature data is not smaller than the first temperature threshold value by means of the second execution module 7, the fresh air is sent to the surface air cooler, and the fresh air is heated by the surface air cooler.
The control system of the fresh air handling unit in this embodiment adopts the control method of the fresh air handling unit in the foregoing embodiment when in use, so the specific content of the control system of the fresh air handling unit will not be described herein.
The embodiment of the application discloses a terminal, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the control method of a fresh air handling unit of the embodiment is executed when the processor loads the computer program.
In one embodiment of the present application, the terminal may be a desktop computer, a notebook computer, or a cloud server, and the terminal includes, but is not limited to, a processor and a memory, for example, the terminal may further include an input/output device, a network access device, a bus, and the like.
In one embodiment of the present application, the processor may be a Central Processing Unit (CPU), and of course, other general purpose processors, digital Signal Processors (DSP), application Specific Integrated Circuits (ASIC), off-the-shelf programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. may be used as the processor, or any conventional processor, etc. according to practical use, the present application is not limited in this respect.
In one embodiment of the present application, the memory may be an internal storage unit of the terminal, for example, a hard disk or a memory of the terminal, or may be an external storage device of the terminal, for example, a plug-in hard disk, a Smart Memory Card (SMC), a secure digital card (SD), or a flash memory card (FC) equipped on the terminal, etc., and the memory may also be a combination of the internal storage unit of the terminal and the external storage device, where the memory is used to store a computer program and other programs and data required by the terminal, and the memory may also be used to temporarily store data that has been output or is to be output, which is not limited by the present application.
Through the setting of the terminal, the control method of the fresh air handling unit of the embodiment is stored in the memory of the terminal and is loaded and executed on the processor of the terminal, so that a user can establish contact with the system through the terminal and inquire various contents processed by the system.
The embodiment of the application discloses a computer readable storage medium, and a computer program is stored in the computer readable storage medium, wherein when the computer program is loaded by a processor, the control method of a fresh air handling unit of the embodiment is executed.
In one embodiment of the present application, the computer program may be stored in a computer readable storage medium, where the computer program includes computer program code, where the computer program code may be in a source code form, an object code form, an executable file form, or some middleware form, etc., and the computer readable storage medium includes any entity or device capable of carrying the computer program code, a recording medium, a usb disk, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a Random Access Memory (RAM), an electrical carrier signal, a telecommunication signal, a software distribution medium, etc., where the computer readable storage medium includes, but is not limited to, the above components.
By setting the computer readable storage medium, the control method of the fresh air handling unit of the embodiment is stored in the computer readable storage medium, loaded and executed on the processor, and after the computer readable storage medium is loaded into any computer, any computer can execute the control method of the fresh air handling unit of the embodiment.
The embodiments of the present application are all preferred embodiments of the present application, and are not intended to limit the scope of the present application, wherein like reference numerals are used to refer to like elements throughout. Therefore: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (10)
1. The control method of the fresh air handling unit is characterized by comprising the following steps of:
collecting first temperature data of fresh air at an air inlet of a cross flow heat exchanger;
judging whether the first temperature data is smaller than a first temperature threshold value or not;
if the first temperature data is smaller than the first temperature threshold value, heating through a surface cooler to preheat fresh air flowing through the cross flow heat exchanger;
and if the first temperature data is not smaller than the first temperature threshold value, sending the fresh air to the surface cooler, and heating the fresh air through the surface cooler.
2. The method of controlling a fresh air handling unit according to claim 1, further comprising, after supplying heat through the surface cooler to preheat fresh air flowing through the cross flow heat exchanger:
collecting second temperature data of fresh air at an air outlet of the cross flow heat exchanger;
judging whether the second temperature data is not smaller than the first temperature threshold value or not;
if the second temperature data is not smaller than the first temperature threshold value, the preheated fresh air is sent to the surface cooler, and the fresh air is heated through the surface cooler;
if the second temperature data is smaller than the first temperature threshold value, increasing the opening of a water valve of the surface air cooler, sending out alarm information, and closing a fan and a fresh air closed air valve.
3. The control method of a fresh air handling unit according to claim 1 or 2, further comprising, after the fresh air is heated by the surface cooler:
the heated fresh air is heated again through a heat exchanger;
collecting third temperature data of the fresh air after reheating;
judging whether the third temperature data is not smaller than a second temperature threshold value or not;
if the third temperature data is not smaller than the second temperature threshold value, increasing the blowing power of the fan, and blowing the reheated fresh air into a room through the fan;
and if the third temperature data is smaller than the second temperature threshold value, increasing the heat supply temperature of the heat exchanger, and reducing the blowing power of the fan so as to blow the reheated fresh air into a room through the fan.
4. The control method of a fresh air handling unit according to claim 3, wherein a heating coil is disposed in the heat exchanger, and the fresh air is reheated by the heating coil, specifically comprising:
monitoring the tube body temperature of the heating coil in real time;
switching a temperature control target according to the temperature of the pipe body and a preset anti-freezing protection temperature threshold value;
and adjusting the medium flow of the heating coil according to the current temperature control target so as to enable the measured temperature corresponding to the current temperature control target to reach the target temperature.
5. The method for controlling a fresh air handling unit according to claim 4, wherein the switching the temperature control target according to the pipe body temperature and a preset freezing protection temperature threshold value specifically comprises:
comparing the tube body temperature with the preset anti-freezing protection temperature threshold value to determine a section where the tube body temperature is located;
and switching the temperature control target according to the determined interval.
6. The method for controlling a fresh air handling unit according to claim 5, wherein the switching the temperature control target according to the determined interval specifically includes:
if the pipe body temperature is greater than or equal to the sum of the preset anti-freezing protection temperature threshold value and the preset value and lasts for a preset time, switching to a first temperature control target, wherein the measured temperature corresponding to the first temperature control target is room temperature, and the target temperature is user-set temperature;
if the pipe body temperature is smaller than or equal to the preset anti-freezing protection temperature threshold value and lasts for the preset time, switching to a second temperature control target, wherein the measured temperature corresponding to the second temperature control target is the pipe body temperature, and the target temperature is the preset anti-freezing protection temperature threshold value;
and if the temperature of the pipe body is larger than the preset anti-freezing protection temperature threshold value and smaller than the sum of the preset anti-freezing protection temperature threshold value and the preset value and lasts for the preset time, keeping the temperature control target which is determined last time unchanged.
7. The method according to claim 6, wherein the heating coil is connected to a medium inflow line, a heat supply control valve is provided on the medium inflow line, and the medium flow rate of the heating coil is adjusted according to the current temperature control target, specifically comprising:
if the measured temperature is greater than the target temperature, reducing the opening of the heat supply control valve;
if the measured temperature is equal to the target temperature, maintaining the current opening of the heating control valve;
and if the measured temperature is smaller than the target temperature, increasing the opening degree of the heat supply control valve.
8. A control system for a fresh air handling unit, comprising:
the acquisition module (4) is used for acquiring first temperature data of fresh air at the air inlet of the cross flow heat exchanger;
a judging module (5) for judging whether the first temperature data is smaller than a first temperature threshold value;
the first execution module (6) is used for supplying heat through a surface cooler to preheat the fresh air flowing through the cross flow heat exchanger when the first temperature data is smaller than the first temperature threshold value;
and the second execution module (7) is used for sending fresh air to the surface cooler and heating the fresh air through the surface cooler when the first temperature data is not smaller than the first temperature threshold value.
9. A terminal comprising a memory, a processor and a computer program stored in the memory and capable of running on the processor, characterized in that the processor performs the method of any of claims 1-7 when the computer program is loaded by the processor.
10. A computer readable storage medium having a computer program stored therein, characterized in that the computer program, when loaded by a processor, performs the method of any of claims 1-7.
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| CN202310869595.3A CN116907061A (en) | 2023-07-14 | 2023-07-14 | Control method and control system of fresh air handling unit |
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| CN202310869595.3A CN116907061A (en) | 2023-07-14 | 2023-07-14 | Control method and control system of fresh air handling unit |
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