CN110107995B - Control method, device and system for auxiliary heating of variable air volume tail end - Google Patents
Control method, device and system for auxiliary heating of variable air volume tail end Download PDFInfo
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- CN110107995B CN110107995B CN201910396529.2A CN201910396529A CN110107995B CN 110107995 B CN110107995 B CN 110107995B CN 201910396529 A CN201910396529 A CN 201910396529A CN 110107995 B CN110107995 B CN 110107995B
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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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 disclosure provides a control method, a device and a system for auxiliary heating of a variable air volume tail end, and relates to the field of air conditioners. The method comprises the following steps: after the air supply temperature is adjusted by an air supply system, delaying the first threshold time to detect whether the ambient temperature at the tail end of the variable air volume and the actual air supply volume meet the supercooling protection condition, wherein the supercooling protection condition comprises that the difference between the ambient temperature and the set temperature is less than or equal to the first temperature threshold, and the actual air supply volume is within a preset range; and starting the heater for auxiliary heating under the condition that the duration time of meeting the supercooling protection condition exceeds a second threshold time. The variable air supply temperature is preferentially adjusted and controlled, and then auxiliary control of terminal electric heating is carried out as required, so that the system can run more energy-saving while the indoor temperature is improved.
Description
Technical Field
The disclosure relates to the field of air conditioners, in particular to a control method, a device and a system for auxiliary heating of a variable air volume tail end.
Background
The variable air volume air conditioning system is a mode of an all-air conditioning system, and is developed along with the comfort and energy-saving requirements of an air conditioner.
In the engineering design and application of the variable air volume air conditioner, although the air conditioner tail end of each cabin is configured with the variable air volume tail end device for automatic temperature control, because an air conditioning system is huge, the loads of the cabins are greatly different and change along with the movement of a ship, and the centralized air conditioner is used for intensively supplying air or changing the air supply temperature to each cabin, the problem of the discomfort that the temperature of each cabin is over-cooled or is firstly over-cooled and then heated is easily caused.
Disclosure of Invention
When the problem of cabin temperature supercooling is solved, the system power consumption is too high and the energy-saving effect is poor.
The technical problem to be solved by the present disclosure is to provide a method, an apparatus and a system for controlling auxiliary heating at the end of variable air volume, which can solve the problem of cabin temperature supercooling and simultaneously enable the system to operate in an energy-saving manner.
According to one aspect of the disclosure, a method for controlling auxiliary heating of a variable air volume terminal is provided, which includes: after the air supply temperature is adjusted by an air supply system, delaying the first threshold time to detect whether the ambient temperature at the tail end of the variable air volume and the actual air supply volume meet the supercooling protection condition, wherein the supercooling protection condition comprises that the difference between the ambient temperature and the set temperature is less than or equal to the first temperature threshold, and the actual air supply volume is within a preset range; and starting the heater for auxiliary heating under the condition that the duration time of meeting the supercooling protection condition exceeds a second threshold time.
In one embodiment, activating the heater to assist in heating comprises: initializing the heating power of a heater according to the difference value of the ambient temperature and the set temperature; and adjusting the heating power of the heater by using a Proportional Integral Derivative (PID) control mode according to the environment temperature, the set temperature and the period of collecting the environment temperature.
In one embodiment, initializing the heating power of the heater includes: initializing the heating power of the heater to be first heating power under the condition that the difference between the ambient temperature and the set temperature is smaller than a second temperature threshold; initializing the heating power of the heater to be second heating power under the condition that the difference between the ambient temperature and the set temperature is greater than or equal to a second temperature threshold and is less than a third temperature threshold; when the difference between the environment temperature and the set temperature is larger than a third temperature threshold, initializing the heating power of the heater to be a third heating power, wherein the third temperature threshold is smaller than or equal to the first temperature threshold; the first heating power is larger than the second heating power, and the second heating power is larger than the third heating power.
In one embodiment, the first heating power has a value of 100%; the value of the second heating power is the ratio of the absolute value of the difference between the ambient temperature and the set temperature to the absolute value of the fourth temperature threshold; wherein the absolute value of the fourth temperature threshold is greater than or equal to the absolute value of the difference between the second temperature threshold and the third temperature threshold; the value of the third heating power is 0%.
In one embodiment, when the difference between the ambient temperature and the set temperature is greater than or equal to a fifth temperature threshold and the heating power of the heater is less than the heating power threshold, the heater is stopped to perform auxiliary heating.
In one embodiment, in the cooling mode, the preset range is determined according to the minimum air supply amount; in the heating mode, the preset range is determined according to the maximum air supply amount.
According to another aspect of the present disclosure, there is also provided a variable air volume end auxiliary heating controller, including: the air supply system comprises a supercooling condition detection unit, a control unit and a control unit, wherein the supercooling condition detection unit is configured to detect whether the ambient temperature at the tail end of variable air volume and the actual air volume meet a supercooling protection condition or not by delaying a first threshold time after the air supply system adjusts the air supply temperature, the supercooling protection condition comprises that the difference between the ambient temperature and the set temperature is smaller than or equal to a first temperature threshold, and the actual air volume is within a preset range; and the auxiliary heating starting unit is configured to start the heater for auxiliary heating when the duration time of satisfying the supercooling protection condition exceeds a second threshold time.
In one embodiment, the auxiliary heating starting unit is configured to initialize the heating power of the heater according to the difference value between the ambient temperature and the set temperature; and adjusting the heating power of the heater by using a Proportional Integral Derivative (PID) control mode according to the environment temperature, the set temperature and the period of collecting the environment temperature.
In one embodiment, the auxiliary heating starting unit is configured to initialize the heating power of the heater to a first heating power if the difference between the ambient temperature and the set temperature is less than a second temperature threshold; initializing the heating power of the heater to be second heating power under the condition that the difference between the ambient temperature and the set temperature is greater than or equal to a second temperature threshold and is less than a third temperature threshold; when the difference between the environment temperature and the set temperature is larger than a third temperature threshold, initializing the heating power of the heater to be a third heating power, wherein the third temperature threshold is smaller than or equal to the first temperature threshold; the first heating power is larger than the second heating power, and the second heating power is larger than the third heating power.
In one embodiment, the first heating power has a value of 100%; the value of the second heating power is the ratio of the absolute value of the difference between the ambient temperature and the set temperature to the absolute value of the fourth temperature threshold; wherein the absolute value of the fourth temperature threshold is greater than or equal to the absolute value of the difference between the second temperature threshold and the third temperature threshold; the value of the third heating power is 0%.
In one embodiment, the auxiliary heating stop unit is configured to stop the heater from performing auxiliary heating when the difference between the ambient temperature and the set temperature is equal to or greater than a fifth temperature threshold and the heating power of the heater is less than a heating power threshold.
In one embodiment, in the cooling mode, the preset range is determined according to the minimum air supply amount; in the heating mode, the preset range is determined according to the maximum air supply amount.
According to another aspect of the present disclosure, there is also provided a variable air volume end auxiliary heating controller, including: a memory; and a processor coupled to the memory, the processor configured to perform the method as described above based on instructions stored in the memory.
According to another aspect of the present disclosure, a variable air volume terminal is also provided, which includes the above-mentioned controller for auxiliary heating of the variable air volume terminal.
In one embodiment, the variable air volume terminal further comprises at least one of a temperature sensor, an air volume sensor and a heater; the temperature sensor is configured to detect an ambient temperature; the air volume sensor is configured to detect an actual air volume at the end of the variable air volume; the heater is configured to assist in heating air delivered to the end of the variable air volume.
According to another aspect of the present disclosure, there is also provided a variable air volume air conditioning system, comprising: the variable air volume end; and a central variable air volume air conditioner configured to control the air supply system to adjust the air supply temperature.
In one embodiment, the central variable air volume air conditioner is configured to increase the temperature of the blast air in a case where the number of variable air volume ends in the supercooling protection condition is larger than the number of variable air volume ends in the non-supercooling protection condition among the variable air volume ends after adjusting the blast air volume; reducing the air supply temperature under the condition that the number of the variable air volume tail ends in the overheat protection condition is larger than that of the variable air volume tail ends in the non-overheat protection condition; in the case where the number of the variable air volume ends in the supercooling or overheating protection condition is equal to the number of the variable air volume ends in the non-supercooling or overheating protection condition, the supply air temperature is maintained.
According to another aspect of the present disclosure, a computer-readable storage medium is also proposed, on which computer program instructions are stored, which instructions, when executed by a processor, implement the steps of the above-described method.
Compared with the prior art, the variable air volume air supply control method and the variable air volume air supply control system have the advantages that the environment temperature is adjusted by means of variable air supply temperature and variable air volume to the maximum extent, then whether the environment temperature at the tail end of the variable air volume and the actual air supply volume meet the supercooling protection condition or not is detected by delaying the first threshold time, and under the condition that the duration time of meeting the supercooling protection condition exceeds the second threshold time, the heater is started to perform auxiliary heating, namely, the auxiliary heating operation starting time is reduced to the maximum extent, so that the system can operate more energy-saving while the indoor temperature is increased.
Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:
fig. 1 is a schematic flow chart of an embodiment of a control method for auxiliary heating of a variable air volume end according to the present disclosure.
Fig. 2 is a schematic flow chart of another embodiment of the control method for auxiliary heating at the variable air volume end of the present disclosure.
Fig. 3 is a schematic structural diagram of an embodiment of a variable air volume end auxiliary heating controller according to the present disclosure.
Fig. 4 is a schematic structural diagram of another embodiment of the variable air volume end auxiliary heating controller of the present disclosure.
Fig. 5 is a schematic structural diagram of another embodiment of the variable air volume end auxiliary heating controller of the present disclosure.
Fig. 6 is a schematic structural diagram of another embodiment of the variable air volume end auxiliary heating controller of the present disclosure.
Fig. 7 is a schematic structural diagram of an embodiment of the variable air volume air conditioning system of the present disclosure.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic flow chart of an embodiment of a control method for auxiliary heating of a variable air volume end according to the present disclosure.
In step 110, after the air supply system adjusts the air supply temperature, whether the ambient temperature at the tail end of the variable air volume and the actual air supply volume meet the supercooling protection condition or not is detected by delaying the first threshold time. The supercooling protection condition comprises that the difference between the ambient temperature and the set temperature is smaller than or equal to a first temperature threshold value, and the actual air supply amount is within a preset range.
For example, the central variable air volume air conditioner controls the whole air volume and air temperature of the periodic regulation system of the air supply system, after the air supply temperature is regulated, the controller at each variable air volume end detects whether the difference between the ambient temperature and the set temperature is less than or equal to a first temperature threshold value or not and whether the actual air volume at the variable air volume end is within a preset range or not after delaying for T1 time. The first threshold time T1 is, for example, 5min to 120min, and the first temperature threshold DeltaT 1 is, for example, -3 ℃ to-0.5 ℃. It will be appreciated by those skilled in the art that the values of the first threshold time T1 and the first temperature threshold Δ T1 in this embodiment are for example only.
In the cooling mode, the preset range is determined according to the minimum air supply amount. For example, the preset range is a first air volume threshold value to a second air volume threshold value, wherein the first air volume threshold value is a product of a minimum air volume and a first coefficient, the second air volume threshold value is a product of the minimum air volume and a second coefficient, and the first coefficient is smaller than the second coefficient. For example, the predetermined range is 0.95 × QminTo 1.05 x Qmin，QminIs the minimum air volume.
In the heating mode, the preset range is determined according to the maximum air supply amount. For example, the preset range is a third air volume threshold value to a fourth air volume threshold value, wherein the third air volume threshold value is the product of the maximum air volume and a third coefficient, and the fourth air volume threshold value is the product of the maximum air volume and a fourth coefficientA product of a fourth coefficient, the third coefficient being less than the fourth coefficient. The third coefficient may be equal to the first coefficient and the fourth coefficient may be equal to the second coefficient. For example, the predetermined range is 0.95 × QmaxTo 1.05 x Qmax，QmaxThe maximum air volume is taken as the air volume.
In step 120, in the case that the duration of time for which the supercooling protection condition is satisfied exceeds a second threshold time, the heater is activated for auxiliary heating.
The second threshold time T2 is, for example, 5min to 10min, and those skilled in the art will understand that the value of the second threshold time T2 in this embodiment is only for example.
For example, if the difference between the ambient temperature and the set temperature is equal to or less than the first temperature threshold, the actual air volume at the variable air volume end is within the preset range, and this state continues for T2 time, the heater is activated to perform auxiliary heating.
In the embodiment, the environment temperature is adjusted by depending on the variable air supply temperature and the variable air volume to the maximum extent, then whether the environment temperature at the tail end of the variable air volume and the actual air supply volume meet the supercooling protection condition or not is detected by delaying the first threshold time, and under the condition that the duration time meeting the supercooling protection condition exceeds the second threshold time, the heater is started to carry out auxiliary heating, namely, the auxiliary heating operation starting time is reduced to the maximum extent, so that the system can be operated more in an energy-saving mode while the indoor temperature is increased.
In another embodiment of the present disclosure, the heating power of the heater is initialized according to the difference between the ambient temperature and the set temperature; and then, according to the ambient temperature, the set temperature and the period of collecting the ambient temperature, the heating power of the heater is regulated by utilizing a PID (proportional integral derivative) control mode.
For example, when the difference between the ambient temperature and the set temperature is smaller than the second temperature threshold, the heat generation power of the initialization heater is the first heat generation power. And when the difference between the ambient temperature and the set temperature is greater than or equal to a second temperature threshold and smaller than a third temperature threshold, the heat generation power of the initialization heater is the second heat generation power. When the difference between the environment temperature and the set temperature is larger than a third temperature threshold, initializing the heating power of the heater to be a third heating power, wherein the third temperature threshold is smaller than or equal to the first temperature threshold; the first heating power is greater than the second heating power, and the second heating power is greater than the third heating power.
In one embodiment, the first heating power is, for example, 100% of the rated heating power or the maximum heating power. The value of the second heating power is, for example, the ratio of the absolute value of the difference between the ambient temperature and the set temperature to the absolute value of the fourth temperature threshold; wherein the absolute value of the fourth temperature threshold is greater than or equal to the absolute value of the difference between the second temperature threshold and the third temperature threshold. The third heat generation power is, for example, 0% of the rated heat generation power or the maximum heat generation power.
For example, the first temperature threshold is-0.5 deg.C, the second temperature threshold is-3 deg.C, the third temperature threshold is-1 deg.C, and the absolute value of the fourth temperature threshold is, for example, 3 deg.C. After starting the heater, if the ambient temperature TRing (C)And a set temperature TIs provided withIf the difference is less than-3 ℃, the heating power of the initialization heater is 100 percent; if the ambient temperature TRing (C)And a set temperature TIs provided withThe difference is greater than or equal to-3 deg.C and less than-1 deg.C, and the heating power of the initialization heater is 100%. T%Ring (C)-TIs provided withI/3 if the ambient temperature TRing (C)And a set temperature TIs provided withWhen the difference is not less than-1 deg.C, the heating power of the initialization heater is 0%.
In the embodiment, the heating power of the heater is initialized according to the difference value between the ambient temperature and the set temperature, and then PID adjustment is performed on the heating power of the heater, so that the initial heating power of the heater can be accurately controlled on the basis of meeting the requirement of preventing indoor supercooling by increasing the indoor temperature through the operation of the heater, the heating power of the heater is adjusted in a stepless manner, and the energy-saving efficiency of the system is improved.
In another embodiment of the disclosure, when the difference between the ambient temperature and the set temperature is greater than or equal to a fifth temperature threshold and the heating power of the heater is less than the heating power threshold, the heater is stopped to perform auxiliary heating. Wherein the fifth temperature threshold is greater than the first temperature threshold.
For example, when the difference between the ambient temperature and the set temperature is 0 ℃ or more and the heating power of the heater is less than 5%, the heater is stopped to perform the auxiliary heating.
Fig. 2 is a schematic flow chart of another embodiment of the control method for auxiliary heating at the variable air volume end of the present disclosure. This embodiment is described taking the cooling mode as an example.
In step 210, the central variable air volume air conditioner controls the adjustment of the air volume. At this time, the auxiliary heat is turned off, and the air supply temperature may be a certain constant value.
In step 220, it is determined whether the variable air volume end requires adjusting the supply air temperature, if so, step 230 is executed, otherwise, step 210 is executed.
For example, in the case where the number of the variable air volume ends in the supercooling protection condition is larger than the number of the variable air volume ends in the non-supercooling protection condition among the variable air volume ends, the blowing air temperature is increased; reducing the air supply temperature under the condition that the number of the variable air volume tail ends in the overheat protection condition is larger than that of the variable air volume tail ends in the non-overheat protection condition; in the case where the number of the variable air volume ends in the supercooling or overheating protection condition is equal to the number of the variable air volume ends in the non-supercooling or overheating protection condition, the supply air temperature is maintained.
At step 230, the supply air temperature is adjusted.
At step 240, each variable air volume end controller detects the ambient temperature T with a delay of T1Ring (C)And an actual air supply amount Q. Maximum air supply quantity QmaxMinimum air supply quantity QminSet temperature TIs provided withMay be a known amount.
At step 250, the ambient temperature T is determinedRing (C)And a set temperature TIs provided withWhether the difference is equal to or less than a first temperature threshold value DeltaT 1 and whether the actual air blowing quantity Q is equal to or more than 0.95 × QminAnd not more than 1.05X QminThe duration T is greater than or equal to a second threshold time T2, if yes, step 260 is performed, otherwise, step 210 is performed.
In step 260, the heater is turned on and the heating power of the heater is initialized. I.e. the auxiliary heating function is not activated until the supercooling protection condition is satisfied.
For example, if TRing (C)-TIs provided with<If the second temperature threshold Δ T2 is the second temperature threshold, the heating power Z of the initialization heater is 100%; t is not less than T2Ring (C)-TIs provided with<When the third temperature threshold Δ T3 is reached, the heating power Z of the initialization heater becomes 100% | TRing (C)-TIs provided with|/a fourth temperature threshold Δ T4; if TRing (C)-TIs provided withAnd Δ T3, the heat generation power Z of the initialization heater is 0%.
In step 270, PID adjustment of the heating power of the heater is performed. Namely, after the auxiliary heat initialization is completed, the heating value of the heater is controlled by using the conventional PID.
In step 280, T is judgedRing (C)-TIs provided withWhether the temperature is greater than or equal to a fifth temperature threshold value Delta T5 and the heating power Z of the heater is smaller than the heating power threshold value ZIs provided withIf so, go to step 290, otherwise, go to step 270.
In the process of stepless regulating the heating power of the heater, the heating power Z and the ambient temperature T need to be detected in real timeRing (C)And excessive input of auxiliary heat is avoided, so that the system consumes resources, and the energy-saving effect is poor, therefore, the condition that the heater quits heating needs to be designed. For example, the heating power Z at the heater<5% and TRing (C)-TIs provided withAnd stopping the operation of the heater when the temperature is more than or equal to 0 ℃, otherwise, keeping the conventional PID regulation of the heater.
At step 290, the heater is stopped for supplemental heating.
In the embodiment, the variable air supply temperature is utilized to the maximum extent to adjust the ambient temperature, the auxiliary heating function is started after the variable air supply temperature is adjusted to the limit, the starting time of the heater is reduced to the maximum extent, the energy-saving effect of the system can be improved, in addition, the auxiliary heating amount is rapidly and accurately determined according to the initial temperature difference boundary by utilizing the auxiliary heating fuzzy rapid stepless control strategy, the heating amount of the heater is adjusted in a stepless manner in the operation stage of the heater, and compared with the traditional step control heater, the control of the heater is more accurate; in addition, the heating power and the ambient temperature of the heater are detected in real time, so that the heater can rapidly exit the heating mode when the exit condition is met, the excessive auxiliary heating investment is avoided, and the energy-saving benefit of the system is further improved.
Fig. 3 is a schematic structural diagram of an embodiment of a variable air volume end auxiliary heating controller according to the present disclosure. The controller includes a supercooling condition detecting unit 310 and an auxiliary heating starting unit 320.
The supercooling condition detecting unit 310 is configured to detect whether the variable air volume end ambient temperature and the actual air volume satisfy a supercooling protection condition after the air supply system adjusts the air supply temperature, with a delay of a first threshold time, wherein the supercooling protection condition includes that a difference between the ambient temperature and the set temperature is less than or equal to a first temperature threshold, and the actual air volume is within a preset range.
The centralized variable air volume air conditioner controls the whole air supply volume and air supply temperature of the periodic adjusting system of the air supply system, and after the air supply temperature is adjusted, the controllers at the tail ends of the variable air volumes delay the time T1 to detect whether the environment temperature at the tail ends of the variable air volumes and the actual air supply volume meet the supercooling protection condition.
In the refrigeration mode, the preset range is determined according to the minimum air supply quantity; in the heating mode, the preset range is determined according to the maximum air supply amount.
The auxiliary heating starting unit 320 is configured to start the heater for auxiliary heating in case that the duration of satisfying the supercooling protection condition exceeds a second threshold time.
In the embodiment, the environment temperature is adjusted by depending on the variable air supply temperature and the variable air volume to the maximum extent, then whether the environment temperature at the tail end of the variable air volume and the actual air supply volume meet the supercooling protection condition or not is detected by delaying the first threshold time, and under the condition that the duration time meeting the supercooling protection condition exceeds the second threshold time, the heater is started to carry out auxiliary heating, namely, the auxiliary heating operation starting time is reduced to the maximum extent, so that the system can be operated more in an energy-saving mode while the indoor temperature is increased.
In another embodiment of the present disclosure, the auxiliary heating starting unit 320 is configured to initialize the heating power of the heater according to the difference between the ambient temperature and the set temperature; and regulating the heating power of the heater by using a PID control mode according to the environment temperature, the set temperature and the period of collecting the environment temperature.
For example, when the difference between the ambient temperature and the set temperature is smaller than the second temperature threshold, the heat generation power of the initialization heater is the first heat generation power. And when the difference between the ambient temperature and the set temperature is greater than or equal to a second temperature threshold and smaller than a third temperature threshold, the heat generation power of the initialization heater is the second heat generation power. When the difference between the environment temperature and the set temperature is larger than a third temperature threshold, initializing the heating power of the heater to be a third heating power, wherein the third temperature threshold is smaller than or equal to the first temperature threshold; the first heating power is greater than the second heating power, and the second heating power is greater than the third heating power.
In one embodiment, the first heating power is, for example, 100% of the rated heating power or the maximum heating power. The value of the second heating power is, for example, the ratio of the absolute value of the difference between the ambient temperature and the set temperature to the absolute value of the fourth temperature threshold; wherein the absolute value of the fourth temperature threshold is greater than or equal to the absolute value of the difference between the second temperature threshold and the third temperature threshold. The third heat generation power is, for example, 0% of the rated heat generation power or the maximum heat generation power.
For example, the first temperature threshold is-0.5 deg.C, the second temperature threshold is-3 deg.C, the third temperature threshold is-1 deg.C, and the absolute value of the fourth temperature threshold is, for example, 3 deg.C. After starting the heater, if the ambient temperature TRing (C)And a set temperature TIs provided withIf the difference is less than-3 ℃, the heating power of the initialization heater is 100 percent; if the ambient temperature TRing (C)And a set temperature TIs provided withThe difference is greater than or equal to-3 deg.C and less than-1 deg.C, and the heating power of the initialization heater is 100%. T%Ring (C)-TIs provided withI/3 if the ambient temperature TRing (C)And a set temperature TIs provided withWhen the difference is not less than-1 deg.C, the heating power of the initialization heater is 0%.
In the embodiment, the heating power of the heater is initialized according to the difference value between the ambient temperature and the set temperature, and then PID adjustment is performed on the heating power of the heater, so that the initial heating power of the heater can be accurately controlled on the basis of meeting the requirement of preventing indoor supercooling by increasing the indoor temperature through the operation of the heater, the heating power of the heater is adjusted in a stepless manner, and the energy-saving efficiency of the system is improved.
In another embodiment of the present disclosure, as shown in fig. 4, the controller further includes an auxiliary heating stop unit 410 configured to stop the heater from performing auxiliary heating in a case where a difference between the ambient temperature and the set temperature is equal to or greater than a fifth temperature threshold and the heating power of the heater is less than the heating power threshold.
For example, when the difference between the ambient temperature and the set temperature is 0 ℃ or more and the heating power of the heater is less than 5%, the heater is stopped to perform the auxiliary heating.
In this embodiment, during the heating power stepless adjustment of the heater, the heating power Z and the ambient temperature T need to be detected in real timeRing (C)And excessive input of auxiliary heat is avoided, so that the system consumes resources, and the energy-saving effect is poor, therefore, the condition that the heater quits heating needs to be designed.
Fig. 5 is a schematic structural diagram of another embodiment of the variable air volume end auxiliary heating controller of the present disclosure. The controller includes a memory 510 and a processor 520. Wherein: the memory 510 may be a magnetic disk, flash memory, or any other non-volatile storage medium. The memory is used to store instructions in the embodiments corresponding to fig. 1-2. Processor 520 is coupled to memory 510 and may be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. The processor 520 is configured to execute instructions stored in memory.
In one embodiment, as also shown in FIG. 6, the controller 600 includes a memory 610 and a processor 620. Processor 620 is coupled to memory 610 through a BUS 630. The controller 600 may also be coupled to an external storage device 650 via a storage interface 640 for retrieving external data, and may also be coupled to a network or another computer system (not shown) via a network interface 660. And will not be described in detail herein.
In this embodiment, the data instructions are stored in the memory, and then the instructions are processed by the processor, so that the indoor temperature is increased, and meanwhile, the system can run more energy-saving.
In another embodiment of the present disclosure, a variable air volume terminal is protected, and the variable air volume terminal comprises the controller for auxiliary heating of the variable air volume terminal.
In another embodiment of the present disclosure, the variable air volume tip further comprises a temperature sensor, an air volume sensor, a heater, and the like. The temperature sensor is configured to detect an ambient temperature; the air volume sensor is configured to detect an actual air volume at the end of the variable air volume; the heater is configured to assist in heating air delivered to the end of the variable air volume.
Fig. 7 is a schematic structural diagram of an embodiment of the variable air volume air conditioning system of the present disclosure. The variable air volume air conditioning system includes a plurality of variable air volume terminals 710 and a collective variable air volume air conditioner 720. The central variable air volume air conditioner 720 is configured to control the air supply system to adjust the temperature of the supplied air and the amount of the supplied air. Communication networks are formed among the variable air volume ends 710 and the centralized variable air volume air conditioner 720 through communication lines 701. The control strategy depends on the communication detection data to implement the strategy.
External air enters the centralized variable air volume air conditioner 720 through the fresh air machine 730, heat exchange is carried out through the heat exchange coil 740, the air after heat exchange is conveyed to the air supply pipeline 760 through the air blower 750 and then conveyed to the variable air volume tail ends 710 with auxiliary heat in sequence. Indoor air is returned through a return air channel 770, and the return air can also exchange heat through a heat exchange coil and then is delivered to a supply air duct 760 through a blower 750. The indoor air may also be exhausted through an exhaust fan 780. A temperature sensor 790 is provided in the air supply duct 760. A temperature sensor 791 is also provided at the return air.
In one embodiment, the central variable air volume air conditioner 720 is configured to increase the supply air temperature in a case where the number of variable air volume ends in the supercooling protection condition is greater than the number of variable air volume ends in the non-supercooling protection condition among the variable air volume ends after adjusting the supply air volume; reducing the air supply temperature under the condition that the number of the variable air volume tail ends in the overheat protection condition is larger than that of the variable air volume tail ends in the non-overheat protection condition; in the case where the number of the variable air volume ends in the supercooling or overheating protection condition is equal to the number of the variable air volume ends in the non-supercooling or overheating protection condition, the supply air temperature is maintained. Each variable air volume terminal 710 delays the first threshold time to detect whether the ambient temperature and the actual air volume of the variable air volume terminal meet the supercooling protection condition, and starts a heater for auxiliary heating when the duration time meeting the supercooling protection condition exceeds the second threshold time; then, auxiliary heating quantity is quickly and accurately input according to the initial temperature difference boundary, the auxiliary heating implementation stage depends on stepless regulation of accurate stepless energy-saving operation of the electric heating quantity, the auxiliary heating power and the environment temperature are monitored in real time, and the auxiliary heating mode is quickly quitted once quitting conditions are met. On the basis of keeping the excellent temperature control of the variable air volume system, the auxiliary heat input time is reduced, the auxiliary heat stepless regulation control precision is improved to reduce the power, and the whole variable air volume system is more energy-saving in operation.
In another embodiment, a computer-readable storage medium has stored thereon computer program instructions which, when executed by a processor, implement the steps of the method in the corresponding embodiment of fig. 1-2. As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, apparatus, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Thus far, the present disclosure has been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.
Claims (14)
1. A control method for auxiliary heating of a variable air volume tail end comprises the following steps:
after the air supply temperature is adjusted by an air supply system, delaying a first threshold time to detect whether the ambient temperature at the tail end of the variable air volume and the actual air supply volume meet the supercooling protection condition, wherein the supercooling protection condition comprises that the difference between the ambient temperature and the set temperature is less than or equal to a first temperature threshold, and the actual air supply volume is within a preset range;
initializing the heating power of the heater to be first heating power under the condition that the difference between the ambient temperature and the set temperature is smaller than a second temperature threshold value under the condition that the duration time meeting the supercooling protection condition exceeds a second threshold value time; initializing the heating power of the heater to a second heating power when the difference between the ambient temperature and the set temperature is greater than or equal to a second temperature threshold and is smaller than a third temperature threshold, wherein the value of the second heating power is the ratio of the absolute value of the difference between the ambient temperature and the set temperature to the absolute value of a fourth temperature threshold; wherein an absolute value of the fourth temperature threshold is greater than or equal to an absolute value of a difference between the second temperature threshold and the third temperature threshold; initializing the heating power of the heater to a third heating power when the difference between the ambient temperature and the set temperature is greater than a third temperature threshold, wherein the third temperature threshold is less than or equal to the first temperature threshold; wherein the first heating power is greater than the second heating power, which is greater than the third heating power;
and regulating the heating power of the heater by using a Proportional Integral Derivative (PID) control mode according to the environment temperature, the set temperature and the period of collecting the environment temperature.
2. The control method according to claim 1,
the value of the first heating power is 100%;
the value of the third heat generation power is 0%.
3. The control method according to claim 1, further comprising:
and stopping the heater for auxiliary heating when the difference between the environment temperature and the set temperature is greater than or equal to a fifth temperature threshold and the heating power of the heater is less than a heating power threshold.
4. The control method according to any one of claims 1 to 3,
in the refrigeration mode, the preset range is determined according to the minimum air supply quantity;
in the heating mode, the preset range is determined according to the maximum air supply amount.
5. A variable air volume end-of-line auxiliary heating controller comprising:
the air supply system comprises a supercooling condition detection unit, a control unit and a control unit, wherein the supercooling condition detection unit is configured to detect whether the ambient temperature at the tail end of variable air volume and the actual air volume meet a supercooling protection condition or not by delaying a first threshold time after the air supply system adjusts the air supply temperature, the supercooling protection condition comprises that the difference between the ambient temperature and the set temperature is smaller than or equal to a first temperature threshold, and the actual air supply volume is within a preset range;
an auxiliary heating starting unit configured to initialize the heating power of the heater to a first heating power if a difference between the ambient temperature and the set temperature is less than a second temperature threshold in a case where a duration time for which a supercooling protection condition is satisfied exceeds a second threshold time; initializing the heating power of the heater to a second heating power when the difference between the ambient temperature and the set temperature is greater than or equal to a second temperature threshold and is smaller than a third temperature threshold, wherein the value of the second heating power is the ratio of the absolute value of the difference between the ambient temperature and the set temperature to the absolute value of a fourth temperature threshold; wherein an absolute value of the fourth temperature threshold is greater than or equal to an absolute value of a difference between the second temperature threshold and the third temperature threshold; initializing the heating power of the heater to a third heating power when the difference between the ambient temperature and the set temperature is greater than a third temperature threshold, wherein the third temperature threshold is less than or equal to the first temperature threshold; wherein the first heating power is greater than the second heating power, which is greater than the third heating power; and regulating the heating power of the heater by using a Proportional Integral Derivative (PID) control mode according to the environment temperature, the set temperature and the period of collecting the environment temperature.
6. The controller of claim 5,
the value of the first heating power is 100%;
the value of the third heat generation power is 0%.
7. The controller of claim 5, further comprising:
and the auxiliary heating stopping unit is configured to stop the heater from performing auxiliary heating when the difference between the environment temperature and the set temperature is greater than or equal to a fifth temperature threshold value and the heating power of the heater is less than a heating power threshold value.
8. The controller according to any one of claims 5-7,
in the refrigeration mode, the preset range is determined according to the minimum air supply quantity;
in the heating mode, the preset range is determined according to the maximum air supply amount.
9. A variable air volume end-of-line auxiliary heating controller comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the method of any of claims 1-4 based on instructions stored in the memory.
10. A variable air volume tip comprising a variable air volume tip supplemental heating controller as claimed in any of claims 5 to 9.
11. The variable air volume tip according to claim 10, further comprising at least one of a temperature sensor, an air volume sensor, and a heater;
the temperature sensor is configured to detect an ambient temperature;
the air volume sensor is configured to detect an actual air volume of the variable air volume end;
the heater is configured to assist in heating air delivered to the end of the variable air volume.
12. A variable air volume air conditioning system comprising:
the variable air volume terminus of claim 10 or 11; and
and the centralized variable air volume air conditioner is configured to control the air supply system to adjust the air supply temperature.
13. The variable air volume air conditioning system according to claim 12,
the central variable air volume air conditioner is configured to increase the temperature of the supplied air in a case where the number of variable air volume ends in a supercooling protection condition is greater than the number of variable air volume ends in a non-supercooling protection condition among the variable air volume ends after adjusting the supplied air volume; reducing the air supply temperature under the condition that the number of the variable air volume tail ends in the overheat protection condition is larger than that of the variable air volume tail ends in the non-overheat protection condition; in the case where the number of the variable air volume ends in the supercooling or overheating protection condition is equal to the number of the variable air volume ends in the non-supercooling or overheating protection condition, the supply air temperature is maintained.
14. A computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the method of any one of claims 1 to 4.
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