CN107576106B - Cold and hot water unit and starting control method and device thereof - Google Patents
Cold and hot water unit and starting control method and device thereof Download PDFInfo
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Abstract
The invention discloses a cold and hot water unit and a starting control method and a device thereof, wherein the starting control method comprises the following steps: after receiving an automatic starting instruction of the cold and hot water unit, acquiring the starting number of the cold and hot water unit subsystems in the normal operation of the last cold and hot water unit, and controlling the cold and hot water unit to start according to the starting number; after the cold and hot water unit stably runs, acquiring the total outlet water temperature of the cold and hot water unit and the set temperature of the cold and hot water unit, and acquiring a target minimum change speed and a target maximum change speed when the cold and hot water unit is started according to the total outlet water temperature and the set temperature; and acquiring the change speed of the current total outlet water temperature of the cold and hot water units, and performing start-stop control on the multiple cold and hot water unit subsystems according to the change speed of the current total outlet water temperature, the target minimum change speed and the target maximum change speed. Therefore, the number of the units to be started can be reasonably controlled, the units are prevented from being started and stopped frequently, and meanwhile, the set temperature can be reached according to the preset speed.
Description
Technical Field
The invention relates to the technical field of cold and hot water units, in particular to a starting control method of a cold and hot water unit, a starting control device of the cold and hot water unit and the cold and hot water unit with the starting control device.
Background
At present, in a cold and hot water unit with a plurality of parallel systems, the start and stop of the unit are directly controlled according to the temperature difference between the outlet water temperature and the set temperature. The mode easily causes the starting quantity of the unit to be too large, and the unit is started and stopped frequently. Therefore, improvement of the start control of the hot and cold water unit is required to prevent the problem of frequent start and stop of the unit caused by unreasonable start.
Disclosure of Invention
The present invention is directed to solving at least one of the problems in the art to some extent.
Therefore, the first objective of the present invention is to provide a start control method for a cold and hot water unit, which reasonably controls the number of the units to be started by controlling the change speed of the total outlet water temperature, so as to prevent the units from being frequently started and stopped, and simultaneously, the set temperature can be reached according to a predetermined speed.
A second object of the invention is to propose a computer-readable storage medium.
A third object of the present invention is to provide a start control device for a chiller-heater unit.
A fourth object of the present invention is to provide a hot and cold water unit.
In order to achieve the above object, a first embodiment of the present invention provides a start control method for a chiller/heater unit, where the chiller/heater unit includes multiple chiller/heater unit subsystems connected in parallel, and the start control method includes the following steps: after receiving an automatic starting instruction of the cold and hot water unit, acquiring the starting number of the cold and hot water unit subsystems in the last normal operation of the cold and hot water unit, and controlling the cold and hot water unit to start according to the starting number; after the cold and hot water unit stably runs, acquiring the total water outlet temperature of the cold and hot water unit and the set temperature of the cold and hot water unit, and acquiring the target minimum change speed and the target maximum change speed when the cold and hot water unit is started according to the total water outlet temperature and the set temperature; and acquiring the change speed of the current total outlet water temperature of the cold and hot water unit, and performing start-stop control on the multiple cold and hot water unit subsystems according to the change speed of the current total outlet water temperature, the target minimum change speed and the target maximum change speed.
According to the start control method of the cold and hot water unit, after the automatic start instruction of the cold and hot water unit is received, the starting number of the cold and hot water unit subsystems in the last normal running of the cold and hot water unit is obtained, and the cold and hot water unit is controlled to start according to the starting number. And then, after the cold and hot water unit stably operates, acquiring the total outlet water temperature of the cold and hot water unit and the set temperature of the cold and hot water unit, and acquiring the target minimum change speed and the target maximum change speed when the cold and hot water unit is started according to the total outlet water temperature and the set temperature. And finally, acquiring the change speed of the current total outlet water temperature of the cold and hot water unit, and performing start-stop control on the multiple cold and hot water unit subsystems according to the change speed of the current total outlet water temperature, the target minimum change speed and the target maximum change speed. Therefore, the number of the units started is reasonably controlled by controlling the change speed of the total water outlet temperature, the units are prevented from being started and stopped frequently, and the set temperature can be reached according to the preset speed.
In addition, the method for controlling the start of the hot and cold water unit according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the target minimum change speed and the target maximum change speed are obtained by the following formulas:
wherein Δ Tmax is the target maximum change speed, Δ Tmin is the target minimum change speed, Tw is the total leaving water temperature, TS is the set temperature, t1 is a preset minimum allowable time to reach the set temperature, and t2 is a preset maximum allowable time to reach the set temperature.
According to an embodiment of the present invention, the controlling the start and stop of the plurality of chiller-heater subsystems according to the change speed of the current total outlet water temperature, the target minimum change speed, and the target maximum change speed includes: if the change speed of the current total outlet water temperature is greater than or equal to the target minimum change speed and less than or equal to the target maximum change speed, controlling the starting number of the cold and hot water unit subsystems to be kept unchanged, and enabling the cold and hot water unit to normally operate; if the change speed of the current total outlet water temperature is smaller than the target minimum change speed, controlling a cold and hot water unit subsystem in the cold and hot water unit subsystems which are not in the starting state to start; and if the change speed of the current total outlet water temperature is greater than the target maximum change speed, controlling one cold and hot water unit subsystem in the cold and hot water unit subsystems in the starting state to be closed.
According to an embodiment of the invention, when the hot and cold water unit is powered on for the first time, after receiving an automatic start-up instruction of the hot and cold water unit, the hot and cold water unit is controlled to start according to a preset starting number.
According to one embodiment of the invention, when a manual starting instruction of the cold and hot water unit is received, the cold and hot water unit is controlled to be started according to the starting number set by a user.
In order to achieve the above object, a second embodiment of the present invention provides a computer-readable storage medium having instructions stored therein, wherein when the instructions are executed, the chiller-heater unit executes the above startup control method.
By executing the starting control method, the computer-readable storage medium of the embodiment of the invention can reasonably control the starting number of the units, prevent the units from being started and stopped frequently, and can reach the set temperature at the preset speed.
In order to achieve the above object, a third aspect of the present invention provides a start control device for a chiller/heater unit, the chiller/heater unit including a plurality of chiller/heater unit subsystems connected in parallel, the start control device including: the first acquisition module is used for acquiring the starting number of the cold and hot water unit subsystems in the last normal running of the cold and hot water unit after receiving an automatic starting instruction of the cold and hot water unit; the control module is used for controlling the cold and hot water unit to start according to the starting number; the second obtaining module is used for obtaining the total water outlet temperature of the cold and hot water unit and the set temperature of the cold and hot water unit after the cold and hot water unit stably operates, and obtaining the target minimum change speed and the target maximum change speed when the cold and hot water unit is started according to the total water outlet temperature and the set temperature; the control module is further configured to obtain a change speed of a current total outlet water temperature of the cold and hot water unit, and perform start-stop control on the multiple cold and hot water unit subsystems according to the change speed of the current total outlet water temperature, the target minimum change speed, and the target maximum change speed.
According to the starting control device of the cold and hot water unit, after the automatic starting instruction of the cold and hot water unit is received, the starting number of the cold and hot water unit subsystems in the normal operation of the cold and hot water unit at the last time is obtained through the first obtaining module, and the cold and hot water unit is controlled to be started through the control module according to the starting number. And then after the cold and hot water unit stably runs, acquiring the total outlet water temperature of the cold and hot water unit and the set temperature of the cold and hot water unit through a second acquisition module, and acquiring the target minimum change speed and the target maximum change speed when the cold and hot water unit is started according to the total outlet water temperature and the set temperature. And finally, acquiring the change speed of the current total outlet water temperature of the cold and hot water unit through the control module, and performing start-stop control on the multiple cold and hot water unit subsystems according to the change speed of the current total outlet water temperature, the target minimum change speed and the target maximum change speed. Therefore, the number of the units started is reasonably controlled by controlling the change speed of the total water outlet temperature, the units are prevented from being started and stopped frequently, and the set temperature can be reached according to the preset speed.
In addition, the start control device for the hot and cold water unit according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the target minimum change speed and the target maximum change speed are obtained by the following formulas:
wherein Δ Tmax is the target maximum change speed, Δ Tmin is the target minimum change speed, Tw is the total leaving water temperature, TS is the set temperature, t1 is a preset minimum allowable time to reach the set temperature, and t2 is a preset maximum allowable time to reach the set temperature.
According to an embodiment of the present invention, when the control module performs start-stop control on the plurality of cold and hot water unit subsystems according to the change speed of the current total outlet water temperature, the target minimum change speed, and the target maximum change speed, if the change speed of the current total outlet water temperature is greater than or equal to the target minimum change speed and less than or equal to the target maximum change speed, the control module controls the starting number of the cold and hot water unit subsystems to be kept unchanged, and the cold and hot water unit normally operates; if the change speed of the current total outlet water temperature is smaller than the target minimum change speed, the control module controls a cold and hot water unit subsystem in the cold and hot water unit subsystems which are not in the starting state to start; and if the change speed of the current total outlet water temperature is greater than the target maximum change speed, the control module controls one cold and hot water unit subsystem in the starting state to be closed.
According to an embodiment of the invention, when the hot and cold water unit is powered on for the first time, after receiving an automatic start-up instruction of the hot and cold water unit, the control module controls the hot and cold water unit to start according to a preset starting number.
According to an embodiment of the invention, when a manual starting instruction of the cold and hot water unit is received, the control module controls the cold and hot water unit to start according to the starting number set by a user.
In order to achieve the above object, a fourth aspect of the present invention provides a hot and cold water unit, which includes the above start control device.
According to the cold and hot water unit provided by the embodiment of the invention, through the start-stop control device, the number of the start-up units can be reasonably controlled, the unit is prevented from being started and stopped frequently, and meanwhile, the set temperature can be reached according to a preset speed.
Drawings
Fig. 1 is a schematic structural view of a hot and cold water unit according to an embodiment of the present invention;
fig. 2 is a flowchart of a start control method of a hot and cold water unit according to an embodiment of the present invention;
fig. 3 is a flowchart of a start-up control method of a hot and cold water unit according to an embodiment of the present invention; and
fig. 4 is a block diagram illustrating an activation control apparatus of a hot and cold water unit according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A start control method of a chiller/heater unit, a computer-readable storage medium, a start control device of a chiller/heater unit, and a chiller/heater unit having the start control device according to an embodiment of the present invention will be described with reference to the accompanying drawings.
In an embodiment of the present invention, the chiller/heater unit may include a plurality of chiller/heater unit subsystems in parallel.
Specifically, as shown in fig. 1, the hot and cold water unit may be provided with a plurality of hot and cold water unit subsystems connected in parallel, for example, a hot and cold water unit subsystem 0#, a hot and cold water unit subsystem 1#, a hot and cold water unit subsystem 2#, and a hot and cold water unit subsystem N #, where the specific number of the hot and cold water unit subsystems may be determined according to an actual situation. The line controller is connected with the host, and the host is used for controlling the slaves.
Fig. 2 is a flowchart of a start control method of a hot and cold water unit according to an embodiment of the present invention. As shown in fig. 2, the start control method of the hot and cold water unit may include the steps of:
and S1, after receiving the automatic starting instruction of the cold and hot water unit, acquiring the starting number of the cold and hot water unit subsystems in the normal operation of the last cold and hot water unit, and controlling the cold and hot water unit to start according to the starting number.
According to one embodiment of the invention, when the hot and cold water unit is powered on for the first time, after the automatic starting instruction of the hot and cold water unit is received, the hot and cold water unit is controlled to be started according to the preset starting number. The preset starting number can be set according to actual conditions, for example, the preset starting number can be P% of the total number (N +1) of the cold and hot water unit subsystems connected in parallel, and the value range of P can be 40-60%.
Specifically, after a user sends an automatic startup instruction to the host through the line controller, the host firstly judges whether the host is powered on for the first time, if so, the host firstly obtains a preset startup number a (N +1) × P%, wherein if a calculated value a is a decimal number, 1-bit rounding can be performed, if the calculated value a is (14+1) × 50% > (7.5), the final startup number is 8, and then the host controls the host and seven slave machines to start and operate; otherwise, the host acquires the opening number A of the last cold and hot water unit in normal operation, and controls the host and the corresponding slave to start operation according to the opening number A.
And S2, after the cold and hot water unit operates stably, acquiring the total outlet water temperature of the cold and hot water unit and the set temperature of the cold and hot water unit, and acquiring the target minimum change speed and the target maximum change speed when the cold and hot water unit is started according to the total outlet water temperature and the set temperature.
According to an embodiment of the present invention, the target minimum change speed and the target maximum change speed are obtained by the following formula (1):
wherein Δ Tmax is a target maximum change speed, Δ Tmin is a target minimum change speed, Tw is a total effluent temperature, TS is a set temperature, t1 is a preset minimum allowable time for reaching the set temperature, t2 is a preset maximum allowable time for reaching the set temperature, t1 and t2 can be set according to actual conditions, for example, the value range of t1 is 15-20 min, and the value range of t2 is 25-30 min.
Specifically, after the master machine controls the master machine and the corresponding slave machines to start and operate, whether the cold and hot water unit stably operates or not can be judged through the operation time, for example, the cold and hot water unit can be judged to stably operate after the master machine controls the master machine and the corresponding slave machines to start and operate for 3min under a common condition, and of course, whether the cold and hot water unit stably operates or not can also be judged in other modes, such as a variation according to the total outlet water temperature.
After the cold and hot water unit stably operates, the total outlet water temperature Tw of the cold and hot water unit can be obtained through a temperature sensor (such as Tw in fig. 1) arranged at the total outlet of the cold and hot water unit, the set temperature TS of the cold and hot water unit set by a user through a line controller is obtained, and then the target minimum variation speed Δ Tmin and the target maximum variation speed Δ Tmax when the cold and hot water unit is started are obtained through calculation according to the total outlet water temperature Tw and the set temperature TS and through the formula (1).
And S3, acquiring the change speed of the current total outlet water temperature of the cold and hot water unit, and performing start-stop control on the multiple cold and hot water unit subsystems according to the change speed of the current total outlet water temperature, the target minimum change speed and the target maximum change speed.
According to an embodiment of the present invention, the start-stop control of the plurality of chiller-heater units subsystems according to the change speed of the current total outlet water temperature, the target minimum change speed and the target maximum change speed includes: if the change speed of the current total outlet water temperature is greater than or equal to the target minimum change speed and less than or equal to the target maximum change speed, controlling the starting number of the cold and hot water unit subsystems to be kept unchanged, and normally operating the cold and hot water unit; if the change speed of the current total outlet water temperature is less than the target minimum change speed, controlling a cold and hot water unit subsystem in the cold and hot water unit subsystems which are not in the starting state to start; and if the change speed of the current total outlet water temperature is greater than the target maximum change speed, controlling one cold and hot water unit subsystem in the cold and hot water unit subsystems in the starting state to be closed.
Specifically, after the target minimum change speed Δ Tmin and the target maximum change speed Δ Tmax of the cold and hot water unit at the time of starting are obtained, the host starts to adjust the starting number a according to the change speed Δ Tw of the total outlet water temperature of the cold and hot water unit, the target minimum change speed Δ Tmin and the target maximum change speed Δ Tmax. For example, the master machine may determine the change speed Δ Tw of the total outlet water temperature of the hot and cold water unit once every third preset time t3 (e.g., 3min to 5min), where when Δ Tw is less than or equal to Δ Tmin, it indicates that the change speed Δ Tw of the current total outlet water temperature is slow, and in order to enable the total outlet water temperature Tw of the hot and cold water unit to quickly reach the set temperature TS, the master machine controls a slave machine to start operation; when the delta Tw is larger than or equal to the delta Tmax, the change speed delta Tw of the current total outlet water temperature is relatively high, the total outlet water temperature Tw of the cold and hot water unit exceeds the set temperature TS within a short time, and further a large number of slave machines are shut down, so that the master machine controls one slave machine which is started to operate to shut down at the moment; when the delta Tmin is less than or equal to the delta Tmax, the change speed delta Tw of the current total outlet water temperature is just described, the number of the starting and stopping of the slave machines is not adjusted at the moment, the cold and hot water unit operates normally, and the total starting number of the master machine and the slave machines at the moment is stored to be used as the starting number of the cold and hot water unit in the next automatic starting operation. Therefore, the number of the units to be started can be reasonably controlled, the units are prevented from being started and stopped frequently, and meanwhile, the set temperature can be reached according to the preset speed.
According to another embodiment of the invention, when a manual starting instruction of the hot and cold water unit is received, the hot and cold water unit is controlled to be started according to the starting number set by a user.
That is to say, after the user sends a manual start-up command to the host computer through the line controller, the host computer directly controls the cold and hot water unit to start according to the start-up number manually set by the user, and enters a normal operation state. Therefore, the starting control of different modes of the cold and hot water unit can be realized through the automatic starting mode and the manual starting mode, and the starting flexibility of the unit can be improved through setting the manual starting mode.
To make the present invention more apparent to those skilled in the art, fig. 3 is a flowchart of a start control method of a hot and cold water unit according to an embodiment of the present invention. As shown in fig. 3, the start control method of the hot and cold water unit may include the steps of:
s101, starting the cold and hot water unit.
And S102, the cold and hot water unit enters an automatic starting mode.
S103, obtaining the opening number A of the cold and hot water unit subsystems in the normal operation of the cold and hot water unit at the last time, and controlling the cold and hot water unit to start according to the opening number A.
And S104, judging whether the running time of the started cold and hot water unit subsystem reaches 3 min. If yes, go to step S105; if not, return to step S103.
S105, obtaining the total water outlet temperature Tw of the cold and hot water unit, and calculating delta Tmin and delta Tmax.
S106, obtaining the change speed delta Tw of the total outlet water temperature of the cold and hot water unit.
S107, whether the delta Tmin is less than or equal to the delta Tw is less than or equal to the delta Tmax is judged. If yes, go to step S108; if not, step S109 is performed.
And S108, controlling the starting number A of the cold and hot water unit subsystems to be kept unchanged, and storing the starting number A to be used as the starting number of the unit in the next automatic starting.
S109, whether the delta Tw is less than the delta Tmin is judged. If yes, go to step S110; if not, step S111 is performed.
And S110, starting a cold and hot water unit subsystem, namely starting the cold and hot water unit subsystem with the starting number A being A + 1. In particular, if the number of the opening a reaches the total number of the parallel hot water unit subsystems, if a is N +1, the number of the opening a is kept unchanged.
S111, judging that the delta Tw is larger than the delta Tmax.
And S112, reducing the number A of the cold and hot water unit subsystems, namely the opening number A of the cold and hot water unit subsystems is equal to A-1. In particular, if the number of on-state a is 1, the number of on-state a is kept unchanged.
And S113, the cold and hot water unit enters a manual starting mode.
And S114, controlling the cold and hot water unit to start according to the starting number set by the user, and normally operating.
In summary, according to the start control method of the hot and cold water unit in the embodiment of the present invention, after the automatic start instruction of the hot and cold water unit is received, the number of the cold and hot water unit subsystems that are started in the normal operation of the hot and cold water unit at the last time is obtained, and the hot and cold water unit is controlled to start according to the number of the cold and hot water units that are started. And then, after the cold and hot water unit stably operates, acquiring the total outlet water temperature of the cold and hot water unit and the set temperature of the cold and hot water unit, and acquiring the target minimum change speed and the target maximum change speed when the cold and hot water unit is started according to the total outlet water temperature and the set temperature. And finally, acquiring the change speed of the current total outlet water temperature of the cold and hot water unit, and performing start-stop control on the multiple cold and hot water unit subsystems according to the change speed of the current total outlet water temperature, the target minimum change speed and the target maximum change speed. Therefore, the number of the units started is reasonably controlled by controlling the change speed of the total water outlet temperature, the units are prevented from being started and stopped frequently, and the set temperature can be reached according to the preset speed.
In addition, an embodiment of the present invention further provides a computer-readable storage medium having instructions stored therein, and when the instructions are executed, the chiller-heater unit executes the above-mentioned start-up control method.
By executing the starting control method, the computer-readable storage medium of the embodiment of the invention can reasonably control the starting number of the units, prevent the units from being started and stopped frequently, and can reach the set temperature at the preset speed.
Fig. 4 is a block diagram illustrating an activation control apparatus of a hot and cold water unit according to an embodiment of the present invention. In an embodiment of the invention, the chiller/heater unit includes a plurality of chiller/heater unit subsystems connected in parallel. As shown in fig. 4, the start/stop control apparatus of the chiller/heater unit may include a first obtaining module 10, a control module 20, and a second obtaining module 30.
The first obtaining module 10 is configured to obtain, after receiving an automatic start instruction of the cold and hot water unit, the number of the cold and hot water unit subsystems that are started when the cold and hot water unit normally operates last time. The control module 20 is used for controlling the cold and hot water unit to start according to the starting number. The second obtaining module 30 is configured to obtain a total outlet water temperature of the cold and hot water unit and a set temperature of the cold and hot water unit after the cold and hot water unit stably operates, and obtain a target minimum change speed and a target maximum change speed when the cold and hot water unit is started according to the total outlet water temperature and the set temperature. The control module 20 is further configured to obtain a change speed of a current total outlet water temperature of the cold and hot water unit, and perform start-stop control on the multiple cold and hot water unit subsystems according to the change speed of the current total outlet water temperature, the target minimum change speed, and the target maximum change speed.
According to an embodiment of the present invention, the target minimum change speed and the target maximum change speed are obtained by using the above formula (1).
According to an embodiment of the present invention, when the control module 20 performs start-stop control on the multiple cold and hot water unit subsystems according to the change speed of the current total effluent temperature, the target minimum change speed and the target maximum change speed, wherein if the change speed of the current total effluent temperature is greater than or equal to the target minimum change speed and less than or equal to the target maximum change speed, the control module 20 controls the starting number of the cold and hot water unit subsystems to be kept unchanged, and the cold and hot water units run normally; if the change speed of the current total outlet water temperature is less than the target minimum change speed, the control module 20 controls a cold and hot water unit subsystem in the cold and hot water unit subsystems which are not in the starting state to start; if the change speed of the current total outlet water temperature is greater than the target maximum change speed, the control module 20 controls one cold and hot water unit subsystem in the cold and hot water unit subsystems in the starting state to be closed.
According to an embodiment of the present invention, when the hot and cold water unit is powered on for the first time, after receiving the automatic start-up command of the hot and cold water unit, the control module 20 controls the hot and cold water unit to start according to the preset start-up number.
According to an embodiment of the present invention, when receiving a manual power-on command of the chiller/heater unit, the control module 20 controls the chiller/heater unit to start according to the start number set by the user.
It should be noted that details not disclosed in the start control device of the hot and cold water unit according to the embodiment of the present invention refer to details disclosed in the start control method of the hot and cold water unit according to the embodiment of the present invention, and detailed descriptions thereof are omitted here.
According to the starting control device of the cold and hot water unit, after the automatic starting instruction of the cold and hot water unit is received, the starting number of the cold and hot water unit subsystems in the normal operation of the cold and hot water unit at the last time is obtained through the first obtaining module, and the cold and hot water unit is controlled to be started through the control module according to the starting number. And then after the cold and hot water unit stably runs, acquiring the total outlet water temperature of the cold and hot water unit and the set temperature of the cold and hot water unit through a second acquisition module, and acquiring the target minimum change speed and the target maximum change speed when the cold and hot water unit is started according to the total outlet water temperature and the set temperature. And finally, acquiring the change speed of the current total outlet water temperature of the cold and hot water unit through the control module, and performing start-stop control on the multiple cold and hot water unit subsystems according to the change speed of the current total outlet water temperature, the target minimum change speed and the target maximum change speed. Therefore, the number of the units started is reasonably controlled by controlling the change speed of the total water outlet temperature, the units are prevented from being started and stopped frequently, and the set temperature can be reached according to the preset speed.
In addition, the embodiment of the invention also provides a cold and hot water unit, which comprises the starting control device.
According to the cold and hot water unit provided by the embodiment of the invention, through the start-stop control device, the number of the start-up units can be reasonably controlled, the unit is prevented from being started and stopped frequently, and meanwhile, the set temperature can be reached according to a preset speed.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In addition, in the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A start-up control method for a chiller/heater unit, the chiller/heater unit comprising a plurality of chiller/heater unit subsystems connected in parallel, the start-up control method comprising the steps of:
after receiving an automatic starting instruction of the cold and hot water unit, acquiring the starting number of the cold and hot water unit subsystems in the last normal operation of the cold and hot water unit, and controlling the cold and hot water unit to start according to the starting number;
after the cold and hot water unit stably runs, acquiring the total water outlet temperature of the cold and hot water unit and the set temperature of the cold and hot water unit, and acquiring the target minimum change speed and the target maximum change speed when the cold and hot water unit is started according to the total water outlet temperature and the set temperature;
acquiring the change speed of the current total outlet water temperature of the cold and hot water unit, and performing start-stop control on the multiple cold and hot water unit subsystems according to the change speed of the current total outlet water temperature, the target minimum change speed and the target maximum change speed;
wherein, the controlling the start and stop of the plurality of cold and hot water unit subsystems according to the change speed of the current total outlet water temperature, the target minimum change speed and the target maximum change speed comprises: if the change speed of the current total outlet water temperature is greater than or equal to the target minimum change speed and less than or equal to the target maximum change speed, controlling the starting number of the cold and hot water unit subsystems to be kept unchanged, and enabling the cold and hot water unit to normally operate; if the change speed of the current total outlet water temperature is smaller than the target minimum change speed, controlling a cold and hot water unit subsystem in the cold and hot water unit subsystems which are not in the starting state to start; and if the change speed of the current total outlet water temperature is greater than the target maximum change speed, controlling one cold and hot water unit subsystem in the cold and hot water unit subsystems in the starting state to be closed.
2. The start control method of a hot and cold water unit according to claim 1, wherein the target minimum change speed and the target maximum change speed are obtained by the following formulas:
wherein Δ Tmax is the target maximum change speed, Δ Tmin is the target minimum change speed, Tw is the total leaving water temperature, TS is the set temperature, t1 is a preset minimum allowable time to reach the set temperature, and t2 is a preset maximum allowable time to reach the set temperature.
3. The start-up control method of a chiller/heater unit according to claim 1, wherein when the chiller/heater unit is initially powered on, the chiller/heater unit is controlled to start up according to a preset start-up number after receiving an automatic start-up command of the chiller/heater unit.
4. The start control method of a chiller/heater unit according to claim 1, wherein the chiller/heater unit is controlled to start up according to a start-up number set by a user when a manual start-up command for the chiller/heater unit is received.
5. A computer-readable storage medium having instructions stored therein, which when executed, the chiller/heater unit performs the startup control method of any one of claims 1-4.
6. A start control apparatus for a chiller/heater unit, the chiller/heater unit including a plurality of chiller/heater unit subsystems connected in parallel, the start control apparatus comprising:
the first acquisition module is used for acquiring the starting number of the cold and hot water unit subsystems in the last normal running of the cold and hot water unit after receiving an automatic starting instruction of the cold and hot water unit;
the control module is used for controlling the cold and hot water unit to start according to the starting number;
the second obtaining module is used for obtaining the total water outlet temperature of the cold and hot water unit and the set temperature of the cold and hot water unit after the cold and hot water unit stably operates, and obtaining the target minimum change speed and the target maximum change speed when the cold and hot water unit is started according to the total water outlet temperature and the set temperature;
the control module is further configured to acquire a change speed of a current total outlet water temperature of the cold and hot water unit, and perform start-stop control on the multiple cold and hot water unit subsystems according to the change speed of the current total outlet water temperature, the target minimum change speed, and the target maximum change speed;
when the control module performs start-stop control on the plurality of cold and hot water unit subsystems according to the change speed of the current total outlet water temperature, the target minimum change speed and the target maximum change speed, if the change speed of the current total outlet water temperature is greater than or equal to the target minimum change speed and less than or equal to the target maximum change speed, the control module controls the starting number of the cold and hot water unit subsystems to be kept unchanged, and the cold and hot water units run normally; if the change speed of the current total outlet water temperature is smaller than the target minimum change speed, the control module controls a cold and hot water unit subsystem in the cold and hot water unit subsystems which are not in the starting state to start; and if the change speed of the current total outlet water temperature is greater than the target maximum change speed, the control module controls one cold and hot water unit subsystem in the starting state to be closed.
7. The activation control apparatus of a hot and cold water unit according to claim 6, wherein the target minimum change speed and the target maximum change speed are obtained by the following formulas:
wherein Δ Tmax is the target maximum change speed, Δ Tmin is the target minimum change speed, Tw is the total leaving water temperature, TS is the set temperature, t1 is a preset minimum allowable time to reach the set temperature, and t2 is a preset maximum allowable time to reach the set temperature.
8. The start-up control device for a chiller/heater unit as set forth in claim 6, wherein when the chiller/heater unit is initially powered on, the control module controls the chiller/heater unit to start up according to a preset start-up number after receiving an automatic start-up command for the chiller/heater unit.
9. The start control device of a chiller/heater unit as set forth in claim 6, wherein said control module controls the start of the chiller/heater unit according to the number of starts set by the user when receiving the manual start-up command of the chiller/heater unit.
10. A hot and cold water unit, characterized in that it comprises an activation control device according to any one of claims 6-9.
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