CN112432237A - Air conditioning system and fresh air preheating method thereof - Google Patents
Air conditioning system and fresh air preheating method thereof Download PDFInfo
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- CN112432237A CN112432237A CN202011334256.8A CN202011334256A CN112432237A CN 112432237 A CN112432237 A CN 112432237A CN 202011334256 A CN202011334256 A CN 202011334256A CN 112432237 A CN112432237 A CN 112432237A
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0035—Indoor units, e.g. fan coil units characterised by introduction of outside air to the room
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/009—Indoor units, e.g. fan coil units characterised by heating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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Abstract
The invention discloses an air conditioning system and a fresh air preheating method thereof. Wherein, this air conditioning system includes: the inlet end of the main steam pipeline is communicated with a steam inlet, and the outlet end of the main steam pipeline is respectively communicated with the inlet ends of the first branch and the second branch; the outlet end of the first branch is communicated with a preheating coil; the outlet end of the second branch is communicated with the reheating coil; and the controller is used for controlling the first branch to be switched on or switched off according to the fresh air temperature, and adjusting the steam flow of the first branch and the steam flow of the second branch according to the fresh air temperature, the preheated air temperature and the hot air temperature at preset intervals after controlling the first branch to be switched on. According to the invention, the steam flow consumed by the preheated fresh air can be accurately controlled according to the actual demand, and the problems of over-preheating or under-preheating are avoided.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioning system and a fresh air preheating method thereof.
Background
The air conditioning system has three working modes of refrigeration, heating and ventilation. When the air conditioner operates, fresh air needs to be introduced from the outside, the outdoor environment temperature in winter is very low, and therefore the fresh air sucked from the outside is also very low. In addition, when the heating mode is started in winter, the low-temperature fresh air introduced from the outside directly exchanges heat with the steam coil, the steam coil needs at least a period of time to heat the introduced low-temperature fresh air to the temperature required by a user, and before reaching the time, the cold air blowing phenomenon can occur, so that the comfort of personnel is influenced. Among the prior art, adopt the mode that steam directly preheated to prevent frostbite and prevent blowing cold wind, but unable accurate control hot steam flow leads to can't preheat the new trend according to actual need, causes to preheat excessively or preheats not enough result.
Aiming at the problem that the fresh air cannot be preheated according to actual needs in the prior art, so that the preheating is excessive or insufficient, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides an air conditioning system and a fresh air preheating method thereof, and aims to solve the problem that fresh air cannot be preheated according to actual needs in the prior art, so that the preheating is excessive or insufficient.
In order to solve the above technical problem, the present invention provides an air conditioning system, wherein the system comprises:
the inlet end of the main steam pipeline is communicated with a steam inlet, and the outlet end of the main steam pipeline is respectively communicated with the inlet ends of the first branch and the second branch;
the outlet end of the first branch is communicated with the preheating coil and used for preheating fresh air introduced from a fresh air inlet of the air conditioning system to form preheated air;
the outlet end of the second branch is communicated with a reheating coil pipe and used for reheating the preheated air to form hot air, and the hot air is discharged to the indoor from an air outlet of the air conditioning system;
and the controller is used for adjusting the steam flow of the first branch and the second branch at preset time intervals according to the fresh air temperature, the preheated air temperature and the hot air temperature after controlling the conduction of the first branch.
Further, the controller is also used for controlling the first branch circuit to be switched on or switched off according to the fresh air temperature.
Further, the system further comprises:
the first valve is arranged on the first branch;
the controller is connected with the first valve, and is specifically used for: after the first valve is opened, adjusting the opening of the first valve according to the fresh air temperature, the preheated air temperature and the air outlet temperature at preset time intervals, and further adjusting the steam flow of the first branch and the second branch.
Further, the system further comprises:
the second valve is arranged on the second branch;
the controller is connected with the second valve, and is specifically used for: after the first valve is opened, adjusting the opening degree of the second valve according to the fresh air temperature, the preheated air temperature and the air outlet temperature at preset time intervals, and further adjusting the steam flow of the first branch and the steam flow of the second branch.
Further, the system further comprises:
the first temperature sensor is arranged at the fresh air inlet and used for detecting the temperature of the fresh air;
the second temperature sensor is arranged between the preheating coil and the reheating coil and used for detecting the temperature of the preheating air;
and the third temperature sensor is arranged at the air outlet and used for detecting the temperature of the hot air.
Further, the system further comprises:
the induced draft fan sets up preheating coil with between the reheating coil, be used for with higher speed preheating wind flow to reheating coil.
The invention also provides a fresh air preheating control method, which is applied to the air conditioning system and comprises the following steps:
after the first branch is controlled to be conducted, acquiring the fresh air temperature, the preheating air temperature and the air outlet temperature of the air conditioning system;
adjusting the steam flow of the first branch and the second branch according to the fresh air temperature, the preheated air temperature and the air outlet temperature every interval preset time;
the first branch is communicated with the preheating coil, and the second branch is communicated with the reheating coil.
Further, according to new trend temperature, advance hot-blast temperature with the steam flow of air-out temperature regulation first branch road and second branch road includes:
calculating a first difference value between the air outlet temperature and the fresh air temperature and a second difference value between the air outlet temperature and the pre-hot air temperature;
adjusting the opening degree of a first valve according to the first difference and the second difference;
wherein the first valve is disposed on the first branch.
Further, when the opening degree of the first valve is adjusted according to the first difference and the second difference, the formula according to which the opening degree of the first valve is adjusted is as follows:
where a is a target opening degree of the first valve, Δ T1 is the first difference, Δ T2 is the second difference, and Amax is a maximum opening degree of the first valve.
Further, according to new trend temperature, advance hot-blast temperature with the steam flow of air-out temperature regulation first branch road and second branch road includes:
calculating a first difference value between the air outlet temperature and the fresh air temperature and a third difference value between the pre-heated air temperature and the fresh air temperature;
adjusting the opening degree of a second valve according to the first difference value and the third difference value;
wherein the second valve is disposed on the second branch.
Further, when the opening degree of the second valve is adjusted according to the first difference and the third difference, the formula according to which the opening degree of the second valve is adjusted is as follows:
where B is a target opening degree of the second valve, Δ T1 is the first difference, Δ T3 is the third difference, and Bmax is a maximum opening degree of the second valve.
Further, before controlling the first branch to be conducted, the method further includes:
and controlling the first branch circuit to be switched on or switched off according to the fresh air temperature.
Further, according to new trend temperature control first branch road switch on or close, include:
if the fresh air temperature is lower than a first threshold value, a first valve is controlled to be opened, and then the first branch is controlled to be conducted;
and if the fresh air temperature is higher than or equal to a first threshold value, controlling the first valve to be kept closed, and further controlling the first branch to be closed.
Further, after controlling the first branch to be conducted, the method further includes: continuing to monitor the fresh air temperature;
and if the fresh air temperature is higher than a second threshold value, controlling the first valve to be closed, and further controlling the first branch circuit to be closed, wherein the second threshold value is larger than the first threshold value.
The invention also provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the fresh air preheating method described above.
By applying the technical scheme of the invention, after the first branch is controlled to be conducted, the steam flow of the first branch and the steam flow of the second branch are adjusted at intervals of preset time according to the fresh air temperature, the preheating air temperature and the hot air temperature through the controller, so that the steam flow consumed by preheating fresh air can be accurately controlled according to actual requirements, and the problems of over-preheating or under-preheating are avoided.
Drawings
FIG. 1 is a block diagram of an air conditioning system according to the present invention;
fig. 2 is a structural view of an air conditioning system according to another embodiment of the present invention;
fig. 3 is a flowchart of a fresh air preheating control method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe different differences in embodiments of the present invention, these differences should not be limited to these terms. These terms are only used to distinguish between different differences. For example, a first difference may also be referred to as a second difference, and similarly, a second difference may also be referred to as a first difference, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
An embodiment provides an air conditioning system, and fig. 1 is a structural diagram of an air conditioning system according to the present invention, as shown in fig. 1, the system including:
the inlet end of the main steam pipeline 1 is communicated with a steam inlet, and the outlet end of the main steam pipeline is respectively communicated with the inlet ends of the first branch 2 and the second branch 3; the air conditioning system also comprises a first branch 2, the outlet end of which is communicated with the preheating coil and is used for preheating fresh air introduced from a fresh air inlet of the air conditioning system to form preheated air; the outlet end of the second branch 3 is communicated with a reheating coil pipe and is used for reheating the preheated air to form hot air, and the hot air is discharged to the indoor from an air outlet of the air conditioning system; form tee bend structure between steam main 1, first branch road 2 and the second branch road 3, steam main 1 can all flow into first branch road 2, also can all flow into second branch road 3, can also partly flow into first branch road 2, and another part flows into second branch road 3, and steam after the heat transfer becomes cold water, flows out by preheating coil and/or reheating coil's cold water outlet.
And the controller 4 is used for adjusting the steam flow of the first branch 2 and the second branch 3 according to the fresh air temperature, the preheated air temperature and the hot air temperature at preset intervals after controlling the conduction of the first branch.
The air conditioning system of this embodiment, through the controller, after the first branch road of control switches on, the steam flow of the first branch road of every interval default time according to new trend temperature, preheating wind temperature and hot-blast temperature regulation and second branch road can be according to actual demand, and the steam flow of new trend consumption is preheated in the accurate control, avoids appearing preheating excessively or preheating not enough problem.
Example 2
The present embodiment provides another air conditioning system, and the controller 4 of the present embodiment is further configured to control the first branch to be turned on or off according to the fresh air temperature. Fig. 2 is a block diagram of an air conditioning system according to another embodiment of the present invention, in order to implement flow control of a first branch path, the air conditioning system further includes: a first valve 5 arranged on the first branch; the controller 4 is connected with the first valve 5, the controller 4 controls the first valve to be opened and closed according to the fresh air temperature, specifically, when the fresh air temperature is lower than a first threshold value, the first valve 5 is controlled to be opened, and then the first branch 2 is controlled to be conducted; when the temperature of the fresh air is higher than or equal to the first threshold value, the first valve 5 is controlled to be kept closed, and then the first branch circuit 2 is controlled to be closed.
After controlling the first valve to be opened, the controller 4 is further configured to adjust the opening degree of the first valve 5 according to the fresh air temperature T0, the preheated air temperature T1 and the air outlet temperature at preset intervals, and further adjust the steam flow of the first branch and the second branch.
What the above scheme was adjusted is the steam flow of first branch road, because the steam flow sum of first branch road and the steam flow of second branch road equals the flow of steam main line 1, namely the steam flow sum of first branch road and second branch road is certain, therefore, in the present invention, also can set up the flow control valve on the second branch road, through setting up the aperture of the flow control valve on the control second branch road, control the steam flow of first branch road and second branch road, this air conditioning system also includes: a second valve 6 arranged on the second branch 3; the controller 4 is connected with the second valve 6, and after the first valve 5 is controlled to be opened, the opening degree of the second valve 6 is adjusted according to the fresh air temperature T0, the preheated air temperature T1 and the air outlet temperature T2 at preset intervals, so that the steam flow of the first branch 2 and the steam flow of the second branch 3 are adjusted.
In order to realize obtaining above-mentioned new trend temperature T0, preheating wind temperature T1 and air-out temperature T2, this air conditioning system still includes: the first temperature sensor 7 is arranged at a fresh air inlet of the air conditioning system and used for detecting the temperature of the fresh air; the second temperature sensor 8 is arranged between the preheating coil and the reheating coil and used for detecting the temperature of the preheating air; and the third temperature sensor 9 is arranged at an air outlet of the air conditioning system and used for detecting the temperature of the hot air.
In order to control the air flow direction and speed, the air conditioning system further comprises: and the induced draft fan 10 is arranged between the preheating coil and the reheating coil and used for accelerating the flow of preheating air to the reheating coil.
Example 3
The present embodiment provides a fresh air preheating control method, which is applied to an air conditioning system in the foregoing embodiment, and fig. 3 is a flowchart of the fresh air preheating control method according to the embodiment of the present invention, as shown in fig. 3, the method includes:
s101, after the first branch is controlled to be conducted, the fresh air temperature, the preheating air temperature and the air outlet temperature of the air conditioning system are obtained.
In specific implementation, the fresh air temperature can be detected through a first temperature sensor arranged at a fresh air inlet of an air conditioning system; detecting the temperature of the preheated air through a second temperature sensor arranged between the preheating coil and the reheating coil; and detecting the temperature of the hot air by a third temperature sensor arranged at an air outlet of the air conditioning system.
S102, adjusting the steam flow of the first branch and the second branch according to the fresh air temperature T0, the preheated air temperature T1 and the air outlet temperature T2 at preset intervals; wherein, first branch road intercommunication preheating coil, second branch road intercommunication reheating coil.
After the first branch circuit is controlled to be conducted, a part of steam in the main steam pipeline flows to the preheating coil, a part of steam flows to the reheating coil, the fresh air temperature T0, the preheating air temperature T1 and the air outlet temperature T2 are detected at preset intervals, the actual heat exchange conditions of the preheating coil and the reheating coil can be obtained, and the steam flow of the first branch circuit and the steam flow of the second branch circuit are correspondingly adjusted according to the actual heat exchange conditions of the preheating coil and the reheating coil so as to adjust the heat exchange conditions.
According to the fresh air preheating control method, after the first branch is controlled to be conducted, the steam flow of the first branch and the steam flow of the second branch are adjusted at intervals of preset time according to the fresh air temperature T0, the preheated air temperature T1 and the air outlet temperature T2, the steam flow consumed by preheated fresh air can be accurately controlled according to actual requirements, and the problem of excessive preheating or insufficient preheating is avoided.
Example 4
This embodiment provides another new trend and preheats control method, for make steam flow regulating variable accord with current actual demand, after control first branch road switches on, at first acquire new trend temperature T0, preheat wind temperature T1 and air-out temperature T2 through corresponding temperature sensor, every interval preset time, according to new trend temperature T0, preheat wind temperature T1 and air-out temperature T2 regulation first branch road and the steam flow of second branch road, specifically include: calculating a first difference value delta T1 between the air outlet temperature T2 and the fresh air temperature T0 and a second difference value delta T2 between the air outlet temperature T2 and the preheating air temperature T1; adjusting the opening A of a first valve on the first branch according to the first difference value delta T1 and the second difference value delta T2 at every preset interval; wherein the first valve is arranged on the first branch. During specific adjustment, the formula is as follows:
In a specific implementation process, if the value of the second difference Δ T2 is too large, which indicates that the reheating capacity of the reheating coil is strong, but the preheating capacity of the preheating coil is not enough, the opening a of the first valve needs to be increased, that is, the larger the value of the second difference Δ T2 is, the larger the opening a of the first valve is, while the opening a of the first valve is increased, the steam flow of the first branch is increased, and the flow of the main steam pipeline is not changed, the steam flow of the second branch is correspondingly decreased. Through the formula, the flow of the adjusted first branch and the flow of the adjusted second branch can meet the current actual requirement.
In the present invention, a second valve may be disposed on the second branch, and the steam flow of the first branch and the steam flow of the second branch are controlled by controlling the opening degree of the second valve, specifically including:
calculating a first difference value delta T1 between the air outlet temperature T2 and the fresh air temperature T0 and a third difference value delta T3 between the pre-heating air temperature T1 and the fresh air temperature T0; adjusting the opening degree B of a second valve on the second branch according to a first difference value delta T1 and a third difference value delta T3 every preset time interval, wherein the formula according to which the opening degree of the second valve is adjusted according to the first difference value and the third difference value is as follows:
In a specific implementation process, if the value of the third difference Δ T3 is too large, which indicates that the preheating capacity of the preheating coil is strong, and the reheating capacity of the reheating coil is not enough, the opening B of the second valve needs to be increased, that is, the larger the value of the second difference Δ T3 is, the larger the opening B of the second valve is, while the opening B of the second valve is increased, the steam flow of the second branch is increased, and the flow of the main steam pipeline is not changed, the steam flow of the first branch is correspondingly decreased. Through the formula, the flow of the adjusted first branch and the flow of the adjusted second branch can meet the current actual requirement.
The above-mentioned step is the steam flow control scheme after first branch switches on, before the above-mentioned step, in order to make first branch switch on when the new trend temperature is lower, in order to preheat the new trend, still need to control first branch switch on or close according to new trend temperature T0.
During specific implementation, can control the switching on or close of first branch road through the switching of the first valve of control setting on first branch road, also can set up the three-way valve at the intersection of steam main line, first branch road and second branch road, through the on-state of control three-way valve, control first branch road and switch on or not.
Under the condition that is provided with the valve on first branch road, according to new trend temperature T0 control first branch road and switch on or close, specifically include:
if the temperature of the fresh air is lower than a first threshold value, which indicates that the temperature of the fresh air is too low and may cause low-temperature damage to internal elements of the air conditioning system, controlling a first valve to be opened and further controlling a first branch circuit to be conducted; if the fresh air temperature is higher than or equal to the first threshold value, the fresh air temperature meets the requirement, the first valve is controlled to be kept closed, and then the first branch is controlled to be closed. The on-off of the first branch circuit is accurately controlled by controlling the opening and closing time of the valve.
After the first branch is controlled to be conducted, the fresh air temperature is continuously monitored; if the new trend temperature is higher than the second threshold value, it indicates that the new trend temperature has satisfied the requirement, need not preheat again, controls first valve and closes, and then control first branch way is closed, makes whole steam flow direction reheat coil pipe to avoid the energy extravagant.
The second threshold is greater than the first threshold, the first threshold is a value obtained by subtracting a maximum deviation value from a fresh air temperature preset value of the air conditioning system, for example, if the fresh air temperature preset value of the air conditioning system is-5 ℃ and the maximum deviation value is 2 ℃, the first threshold is-7 ℃, the second threshold is a value obtained by subtracting a maximum deviation value from a fresh air temperature preset value of the air conditioning system, for example, if the fresh air temperature preset value of the air conditioning system is-5 ℃ and the maximum deviation value is 2 ℃, the second threshold is-3 ℃.
Example 5
The embodiment provides an air conditioning system, which is applied to a centralized air conditioner and used for solving the problem that low-temperature fresh air (cold air) directly enters a fan and a motor to be damaged in winter heating. The centralized air conditioner has three working modes of refrigeration, heating and ventilation. The centralized air conditioner is responsible for mixing, filtering and heat and humidity treatment of fresh air and return air, and the fresh air and the return air are conveyed to a terminal device of each indoor space through a variable frequency blower; and meanwhile, the system is responsible for calculating and allocating the air volume and the temperature of the whole system, and the accurate temperature control of the indoor space and the air volume balance of the air conditioning system are realized according to the difference value of the actual temperature and the set temperature of each indoor space.
Heating principle of the centralized air conditioner: when the outdoor environment temperature is lower in winter, the combined cabinet executes the heating function through the heating feedback signal (the difference between the set temperature and the environment temperature) provided by the end device, fresh air introduced by the draught fan and return air in the indoor space are mixed in the mixing box, the mixed air is heated through the reheating coil pipe after passing through the air filter, and the air is sent to the end device of each indoor space through the fan after being subjected to humidity regulation, so that the heating purpose is achieved.
The air conditioning system of this embodiment has set up the tee bend structure including main steam line, first branch road, second branch road, divide into two the tunnel with hot water/hot steam, and first branch road intercommunication preheating coil, second branch road intercommunication reheating coil sets up flow control valve on first branch road. In the heating mode, the opening and closing of the flow regulating valve on the first branch are controlled according to the fresh air temperature T0, after the flow regulating valve on the first branch is opened, the opening degree of the flow regulating valve on the first branch or the second branch is continuously regulated according to the fresh air temperature T0, the preheated air temperature T1 and the air outlet temperature T2, and further the flow of the refrigerant flowing into the preheating coil and the flow of the refrigerant flowing into the reheating coil are regulated. The hot air generated after reheating is delivered to each end device.
The opening and closing control process of the flow regulating valve:
s1, determining whether the fresh air temperature is lower than a first threshold, where the first threshold is a value obtained by subtracting a maximum deviation from a preset fresh air temperature value of the air conditioning system, and for example, if the preset fresh air temperature value of the air conditioning system is-5 ℃ and the maximum deviation is 2 ℃, the first threshold is-7 ℃.
S2, when the fresh air temperature T0 is lower than a first threshold value, the fresh air preheating is judged to be needed, the flow regulating valve on the first branch is controlled to be opened, part of steam flows into the preheating coil pipe through the first branch, the sucked fresh air is preheated, the temperature of the fresh air is increased, and then the fresh air is filtered and reheated. In order to ensure the accuracy of the detected data, the flow regulating valve on the first branch may be controlled to open after the fresh air temperature T0 is lower than the first threshold for a preset time (e.g. 10 s).
S3, after the flow regulating valve on the first branch is opened, the fresh air temperature is continuously detected, when the fresh air temperature T0 is higher than or equal to the first threshold value and lower than or equal to the second threshold value, the fresh air preheating is judged to be still needed, and the flow regulating valve on the first branch is controlled to maintain the opening state. The second threshold is the temperature preset value of the fresh air of the air conditioning system minus the maximum deviation value, for example, if the temperature preset value of the fresh air of the air conditioning system is-5 ℃ and the maximum deviation value is 2 ℃, the second threshold is-3 ℃.
And S4, continuously detecting the fresh air temperature, and when the fresh air temperature T0 is greater than a second threshold value, controlling the flow regulating valve on the first branch to be closed, so that the steam does not enter the preheating coil any more and is completely supplied to the reheating coil. In order to ensure the accuracy of the detection data, the flow regulating valve on the first branch may be controlled to open after the fresh air temperature T0 is higher than the second threshold for a preset time (for example, 10 s).
It should be noted that, in other modes, the flow regulating valve on the first branch is always closed, and only after the heating mode is entered, the fresh air preheating solenoid valve executes the above operation. Therefore, the condition that the temperature of air entering the induced draft fan, the motor, the filter and the reheating coil is too low and the components are damaged at low temperature is avoided, and the service lives of the components are prolonged.
The steam flow control strategy of the first branch and the second branch comprises:
after controlling the opening of a flow regulating valve on the first branch, detecting a fresh air temperature T0, a preheating air temperature T1 and an air outlet temperature T2;
calculating a first difference value delta T1 between the air outlet temperature T2 and the fresh air temperature T0 and a second difference value delta T2 between the air outlet temperature T2 and the preheating air temperature T1; and adjusting the opening A of the flow regulating valve on the first branch according to the first difference value delta T1 and the second difference value delta T2 every preset time interval. Wherein the content of the first and second substances,
a is the target opening degree of the flow regulating valve on the first branch, delta T1 is the first difference value, delta T2 is the second difference value, and Amax is the maximum opening degree of the first valve.
In a specific implementation process, if the value of the second difference Δ T2 is too large, which indicates that the reheating capacity of the reheating coil is very strong, and the preheating capacity of the preheating coil is not enough, the opening a of the flow regulating valve on the first branch needs to be increased, that is, the larger the value of the second difference Δ T2 is, the larger the opening a of the flow regulating valve on the first branch is, while the opening a of the flow regulating valve on the first branch is increased, the steam flow of the first branch is increased, and the flow of the main steam pipeline is not changed, the steam flow of the second branch is correspondingly decreased.
The steam flow of the first branch and the steam flow of the second branch are controlled by controlling the opening degree of the flow regulating valve arranged on the second branch. The method comprises the following specific steps:
calculating a first difference value delta T1 between the air outlet temperature T2 and the fresh air temperature T0 and a third difference value delta T3 between the pre-heating air temperature T1 and the fresh air temperature T0; adjusting the opening degree B of the flow regulating valve on the second branch according to the first difference value delta T1 and the third difference value delta T3 at every interval of preset time; wherein the content of the first and second substances,
Δ T1 is a first difference, Δ T3 is a third difference, and Bmax is the maximum opening degree of the flow rate adjustment valve on the second branch.
In a specific implementation process, if the value of the third difference Δ T3 is too large, which indicates that the preheating capacity of the preheating coil is very strong, and the reheating capacity of the reheating coil is not enough, the opening B of the flow regulating valve on the second branch needs to be increased, that is, the larger the value of the second difference Δ T3 is, the larger the opening B of the flow regulating valve on the second branch is, while the opening B of the flow regulating valve on the second branch is increased, the steam flow of the second branch is increased, and the flow of the main steam pipeline is not changed, the steam flow of the first branch is correspondingly decreased.
Example 6
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the fresh air preheating method described above.
The air conditioning system of this embodiment through detecting new trend temperature, hot air temperature and air-out temperature in advance, steam flow is preheated in control, guarantees that coil pipe steam flow is according to heat transfer demand rational distribution, realizes intelligent control, guarantees to avoid steam extravagant or not enough, can realize improving the rational utilization of the energy when motor, fan life-span and reliability to user's travelling comfort has been improved.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (15)
1. An air conditioning system, characterized in that the system comprises:
the inlet end of the main steam pipeline is communicated with a steam inlet, and the outlet end of the main steam pipeline is respectively communicated with the inlet ends of the first branch and the second branch;
the outlet end of the first branch is communicated with the preheating coil and used for preheating fresh air introduced from a fresh air inlet of the air conditioning system to form preheated air;
the outlet end of the second branch is communicated with a reheating coil pipe and used for reheating the preheated air to form hot air, and the hot air is discharged to the indoor from an air outlet of the air conditioning system;
and the controller is used for adjusting the steam flow of the first branch and the second branch at preset time intervals according to the fresh air temperature, the preheated air temperature and the hot air temperature after controlling the conduction of the first branch.
2. The system of claim 1, wherein the controller is further configured to control the first branch to be turned on or off according to a fresh air temperature.
3. The system of claim 1, further comprising:
the first valve is arranged on the first branch;
the controller is connected with the first valve, and is specifically used for: after the first valve is opened, adjusting the opening of the first valve according to the fresh air temperature, the preheated air temperature and the air outlet temperature at preset time intervals, and further adjusting the steam flow of the first branch and the second branch.
4. The system of claim 3, further comprising:
the second valve is arranged on the second branch;
the controller is connected with the second valve, and is specifically used for: after the first valve is opened, adjusting the opening degree of the second valve according to the fresh air temperature, the preheated air temperature and the air outlet temperature at preset time intervals, and further adjusting the steam flow of the first branch and the steam flow of the second branch.
5. The system of claim 1, further comprising:
the first temperature sensor is arranged at the fresh air inlet and used for detecting the temperature of the fresh air;
the second temperature sensor is arranged between the preheating coil and the reheating coil and used for detecting the temperature of the preheating air;
and the third temperature sensor is arranged at the air outlet and used for detecting the temperature of the hot air.
6. The system of claim 1, further comprising:
the induced draft fan sets up preheating coil with between the reheating coil, be used for with higher speed preheating wind flow to reheating coil.
7. A fresh air preheating control method applied to the air conditioning system as claimed in any one of claims 1 to 6, characterized by comprising the following steps:
after the first branch is controlled to be conducted, acquiring the fresh air temperature, the preheating air temperature and the air outlet temperature of the air conditioning system;
adjusting the steam flow of the first branch and the second branch according to the fresh air temperature, the preheated air temperature and the air outlet temperature every interval preset time;
the first branch is communicated with the preheating coil, and the second branch is communicated with the reheating coil.
8. The method of claim 7, wherein adjusting the steam flow of the first and second branches based on the fresh air temperature, the pre-heated air temperature, and the outlet air temperature comprises:
calculating a first difference value between the air outlet temperature and the fresh air temperature and a second difference value between the air outlet temperature and the pre-hot air temperature;
adjusting the opening degree of a first valve according to the first difference and the second difference;
wherein the first valve is disposed on the first branch.
9. The method of claim 8, wherein adjusting the opening of the first valve based on the first difference and the second difference is according to the formula:
where a is a target opening degree of the first valve, Δ T1 is the first difference, Δ T2 is the second difference, and Amax is a maximum opening degree of the first valve.
10. The method of claim 7, wherein adjusting the steam flow of the first and second branches based on the fresh air temperature, the pre-heated air temperature, and the outlet air temperature comprises:
calculating a first difference value between the air outlet temperature and the fresh air temperature and a third difference value between the pre-heated air temperature and the fresh air temperature;
adjusting the opening degree of a second valve according to the first difference value and the third difference value;
wherein the second valve is disposed on the second branch.
11. The method of claim 10, wherein adjusting the opening of the second valve based on the first difference and the third difference is according to the formula:
where B is a target opening degree of the second valve, Δ T1 is the first difference, Δ T3 is the third difference, and Bmax is a maximum opening degree of the second valve.
12. The method of claim 7, wherein prior to controlling the first branch to conduct, the method further comprises:
and controlling the first branch circuit to be switched on or switched off according to the fresh air temperature.
13. The method of claim 12, wherein controlling the first branch to turn on or off according to the fresh air temperature comprises:
if the fresh air temperature is lower than a first threshold value, a first valve is controlled to be opened, and then the first branch is controlled to be conducted;
and if the fresh air temperature is higher than or equal to a first threshold value, controlling the first valve to be kept closed, and further controlling the first branch to be closed.
14. The method of claim 13, wherein after controlling the first branch to conduct, the method further comprises:
continuing to monitor the fresh air temperature;
and if the fresh air temperature is higher than a second threshold value, controlling the first valve to be closed, and further controlling the first branch circuit to be closed, wherein the second threshold value is larger than the first threshold value.
15. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 7 to 14.
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