CN112460711B - Water chilling unit control method and device and water chilling unit - Google Patents
Water chilling unit control method and device and water chilling unit Download PDFInfo
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- CN112460711B CN112460711B CN202011492610.XA CN202011492610A CN112460711B CN 112460711 B CN112460711 B CN 112460711B CN 202011492610 A CN202011492610 A CN 202011492610A CN 112460711 B CN112460711 B CN 112460711B
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0035—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using evaporation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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Abstract
The invention discloses a water chilling unit control method and device and a water chilling unit. The water chilling unit comprises a natural refrigeration circulation loop and a compressor refrigeration circulation loop, a cooling water circulation system in the compressor refrigeration circulation loop is provided with an anti-freezing device, and the method comprises the following steps: monitoring the ambient temperature of a condenser of a water chilling unit; and if the ambient temperature is less than or equal to the first preset temperature, controlling the natural refrigeration circulation loop to refrigerate, closing the compressor refrigeration circulation loop, and controlling the anti-freezing device to prevent freezing according to the ambient temperature. The invention can prevent the cooling water circulation system from being frozen by the anti-freezing device under the working condition of lower environmental temperature, and prevent the cooling water circulation pump and the valve from being damaged due to frosting and freezing under the working condition in winter.
Description
Technical Field
The invention relates to the technical field of units, in particular to a water chilling unit control method and device and a water chilling unit.
Background
The evaporation cold water chilling unit has more and more use requirements due to huge potential in the aspect of energy efficiency, and the unit with the natural cooling function is particularly suitable for the annual refrigeration function. The evaporative cooling water chilling unit uses an evaporative condenser, and the evaporative condenser is a device which absorbs heat of high-temperature gaseous refrigerant in a coil pipe when spray water outside the coil pipe is partially evaporated during refrigeration so that the refrigerant in the coil pipe is gradually cooled from a gaseous state to a liquid state. The special cooling form of the evaporative condenser cannot adapt to the refrigeration requirement under the low-temperature working condition, and under the working condition in winter, because the environmental temperature is too low, the cooling water circulation system of the evaporative condenser is easy to freeze, so that a water pump and a valve in the cooling water circulation system are damaged.
Disclosure of Invention
The embodiment of the invention provides a water chilling unit control method and device and a water chilling unit, and at least solves the problem that a cooling water circulation system of an evaporation cold water chilling unit in the prior art is easy to damage under a low-temperature working condition.
In order to solve the technical problem, an embodiment of the present invention provides a method for controlling a water chiller, where the water chiller includes a natural refrigeration cycle loop and a compressor refrigeration cycle loop, and a cooling water circulation system in the compressor refrigeration cycle loop is provided with an anti-freezing device, and the method includes: monitoring the ambient temperature of a condenser of the water chilling unit; and if the environment temperature is less than or equal to a first preset temperature, controlling the natural refrigeration circulation loop to refrigerate, closing the compressor refrigeration circulation loop, and controlling the anti-freezing device to freeze according to the environment temperature.
Optionally, the cooling water circulation system includes: the cooling circulating water pump is connected with the spray header; the anti-freezing device comprises: the heating device, the drain valve and the water replenishing valve; the heating device is arranged on the water tank and the connecting pipeline, and the drain valve and the water replenishing valve are both arranged on the water tank; controlling the anti-freeze apparatus according to the ambient temperature, comprising: and controlling the heating device, the drain valve and the water replenishing valve to be opened and closed according to the temperature interval of the environment temperature.
Optionally, according to the temperature range where the environmental temperature is located, controlling the opening and closing of the heating device, the drain valve, and the water replenishing valve includes: if the environment temperature is less than or equal to the first preset temperature and greater than the difference value between the first preset temperature and a preset value, the heating device is started, and the cooling circulating water pump, the drain valve and the water replenishing valve are closed; and if the environment temperature is less than or equal to the difference value between the first preset temperature and the preset value, starting the heating device and the drain valve, and closing the cooling circulating water pump and the water replenishing valve.
Optionally, after the heating device and the drain valve are opened, the method further comprises: and when the liquid level in the water tank is detected to be 0 mm, the heating device and the drain valve are closed.
Optionally, after the heating device and the drain valve are turned on and the cooling circulation water pump and the water replenishing valve are turned off, the method further includes: and when the environment temperature is greater than the difference value between the first preset temperature and the preset value, opening the water replenishing valve until the liquid level in the water tank reaches the preset liquid level, and closing the water replenishing valve.
Optionally, after the heating device is turned on, the method further includes: and when the environment temperature is higher than the first preset temperature, closing the heating device.
Optionally, after monitoring the ambient temperature of the condenser of the water chilling unit, the method further includes: if the ambient temperature is higher than the first preset temperature and lower than or equal to a second preset temperature, controlling the water chilling unit to work in a mixed refrigeration mode, and controlling the cooling circulating water pump to be switched on and off according to the ambient temperature; wherein the mixed refrigeration mode is: and controlling the natural refrigeration circulation loop to refrigerate, and starting the compressor refrigeration circulation loop to supplement refrigeration when the refrigerating capacity provided by the natural refrigeration circulation loop cannot meet the refrigeration requirement.
Optionally, controlling the cooling circulation water pump to open and close according to the ambient temperature includes: if the environment temperature is higher than the first preset temperature and lower than or equal to a third preset temperature, closing the cooling circulating water pump; and if the ambient temperature is higher than the third preset temperature and lower than or equal to the second preset temperature, starting the cooling circulating water pump when the compressor refrigeration circulating loop needs to be started.
Optionally, the third preset temperature is: the first preset temperature + (the second preset temperature-the first preset temperature) × 0.5.
The embodiment of the invention also provides a control device of the water chilling unit, the water chilling unit comprises a natural refrigeration circulation loop and a compressor refrigeration circulation loop, a cooling water circulation system in the compressor refrigeration circulation loop is provided with an anti-freezing device, and the control device of the water chilling unit comprises: the monitoring module is used for monitoring the ambient temperature of a condenser of the water chilling unit; and the first control module is used for controlling the natural refrigeration circulation loop to refrigerate, closing the compressor refrigeration circulation loop and controlling the anti-freezing device to freeze according to the environment temperature if the environment temperature is less than or equal to a first preset temperature.
An embodiment of the present invention further provides a water chilling unit, including: the cooling water system comprises a natural refrigeration circulation loop, a compressor refrigeration circulation loop and a cooling water unit control device, wherein a cooling water circulation system in the compressor refrigeration circulation loop is provided with an anti-freezing device.
Optionally, the cooling water circulation system includes: the cooling circulating water pump is connected with the spray header; the anti-freezing device comprises: the heating device, the drain valve and the water replenishing valve; the heating device is arranged on the water tank and the connecting pipeline, and the drain valve and the water replenishing valve are both arranged on the water tank.
Optionally, the anti-freeze device further includes: and the liquid level detector is arranged inside the water tank and used for detecting the liquid level in the water tank.
The embodiment of the invention also provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the computer readable storage medium realizes the control method of the water chilling unit according to the embodiment of the invention.
By applying the technical scheme of the invention, the cooling water circulation system in the compressor refrigeration circulation loop is provided with the anti-freezing device, the environment temperature of the condenser of the water chilling unit is monitored, if the environment temperature is less than or equal to the first preset temperature, the natural refrigeration circulation loop is controlled to refrigerate, the compressor refrigeration circulation loop is closed, and the anti-freezing device is controlled according to the environment temperature to prevent freezing, so that the anti-freezing device can be used for preventing freezing of the cooling water circulation system under the working condition of lower environment temperature, the condition that the cooling water is frosted and frozen to cause damage to a cooling circulation water pump and a valve under the working condition of winter seasons is prevented, and the problem that the cooling water circulation system of the evaporative cooling water chilling unit is easy to damage under the low-temperature working condition in the prior art is solved.
Drawings
Fig. 1 is a schematic structural diagram of a water chilling unit according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of a water chilling unit according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of freeze protection control provided by an embodiment of the present invention;
fig. 4 is a block diagram of a control device of a water chiller according to an embodiment of the present invention;
reference numerals: the system comprises a compressor 1, an evaporative condenser 2, an electronic expansion valve 3, an evaporator 4, a water tank 5, a cooling circulating water pump 6, a heating device 7, a natural cooling water pump 8, a natural cooling coil 9, a natural cooling plate exchanger 10 and a cooling fan 11.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic structural diagram of a water chilling unit according to an embodiment of the present invention is provided, where the water chilling unit according to the embodiment of the present invention has a natural cooling function, and includes: a natural refrigeration cycle circuit and a compressor refrigeration cycle circuit. The compressor refrigeration cycle includes: compressor 1, evaporative condenser 2, electronic expansion valve 3 and evaporimeter 4, wherein, evaporative condenser 2 department is provided with cooling water circulation system, and cooling water circulation system includes: water tank 5, cooling circulation water pump 6, shower head and connecting line, cooling water circulation system are provided with freeze-proof device, and freeze-proof device includes: the heating device 7 is arranged on the water tank 5 and the connecting pipeline, for example, the heating device 7 can be a self-temperature-limiting heat tracing band and is wound on the bottom of the water tank and the surface of the connecting pipeline. The drain valve and the water replenishing valve are both arranged on the water tank and are not shown in the figure. The anti-freeze apparatus may further include: and a liquid level detector disposed inside the water tank for detecting a liquid level inside the water tank, not shown in the drawings. When the compressor refrigeration cycle loop carries out refrigeration, the flow direction of a refrigerant is as follows: the compressor 1 → the evaporative condenser 2 → the electronic expansion valve 3 → the evaporator 4 → the compressor 1, and in the compressor refrigeration cycle circuit, the temperature of the refrigerant in the condenser can be lowered by shower water of the cooling water circulation system and/or the temperature of the refrigerant in the condenser can be lowered by heat exchange with outside air by the cooling fan 11.
The natural refrigeration cycle includes: a natural cooling water pump 8, a natural cooling coil 9 and a natural cooling plate 10. When the natural cooling circulation loop carries out refrigeration, the flow direction of the natural cooling circulation refrigerating medium (such as glycol solution) is as follows: free cooling water pump 8 → free cooling coil 9 → free cooling plate 10 → free cooling water pump 8. Through natural cooling water pump 8 as the power supply, the heat that trades natural cooling board 10 transports outdoor natural cooling coil 9 side through natural cooling circulation secondary refrigerant, with outside air heat transfer, with the heat discharge outdoor to realize the refrigeration, specific accessible cooling blower 11 is supplementary discharges the heat outdoor.
Fig. 2 is a flowchart of a control method for a chiller according to an embodiment of the present invention, and as shown in fig. 2, the method includes the following steps:
s201, monitoring the environment temperature of a condenser of the water chilling unit.
S202, if the environment temperature is less than or equal to the first preset temperature, controlling the natural refrigeration circulation loop to refrigerate, closing the compressor refrigeration circulation loop, and controlling the anti-freezing device to freeze according to the environment temperature. The anti-freezing device is arranged on a cooling water circulation system in the compressor refrigeration circulation loop.
Among them, in the case of a chiller which performs year-round cooling, a condenser is installed outdoors, and thus, the outdoor ambient temperature is monitored. The first preset temperature is a temperature threshold value used for judging the low-temperature working condition, and can be set according to the weather condition of the area where the water chilling unit is located, and the first preset temperature is a smaller value, and can be set to be 0 ℃. The environment temperature is less than or equal to the first preset temperature, the environment temperature is low, the working condition in winter is indicated, under the working condition, the natural refrigeration circulation loop is controlled to refrigerate, and the compressor refrigeration circulation loop is controlled not to work, so that the refrigeration is realized by fully utilizing the natural cooling function, and the energy consumption of the water chilling unit in the working condition in winter is reduced. Specifically, the natural cooling water pump 8 and the cooling fan 11 are turned on to refrigerate the natural refrigeration circulation circuit, and the compressor 1, the electronic expansion valve 3 and the cooling circulation water pump 6 are turned off to make the compressor refrigeration circulation circuit not work. Meanwhile, under the working condition in winter, the anti-freezing device is controlled according to the environment temperature to prevent freezing, so that the freezing damage of the cooling water circulation system can be avoided.
The water chilling unit control method of the embodiment includes that a cooling water circulation system in a compressor refrigeration circulation loop is provided with an anti-freezing device, the environment temperature where a condenser of the water chilling unit is located is monitored, if the environment temperature is smaller than or equal to a first preset temperature, a natural refrigeration circulation loop is controlled to refrigerate, the compressor refrigeration circulation loop is closed, and the anti-freezing device is controlled according to the environment temperature to prevent freezing.
In one embodiment, a cooling water circulation system includes: the cooling circulating water pump is connected with the spray header; the freeze-proof device includes: the heating device, the drain valve and the water replenishing valve; the heating device is arranged on the water tank and the connecting pipeline, and the drain valve and the water replenishing valve are both arranged on the water tank. Controlling an anti-freeze apparatus according to an ambient temperature, comprising: and controlling the heating device, the drain valve and the water replenishing valve to be opened and closed according to the temperature interval of the environment temperature. According to the embodiment, the heating device, the drain valve and the water replenishing valve are controlled to be opened and closed by monitoring the environmental temperature, so that effective anti-freezing control under working conditions in winter is realized, and the water pump and the valve are prevented from being damaged due to freezing of a cooling water circulation system.
In one embodiment, the controlling the opening and closing of the heating device, the drain valve and the water replenishing valve according to the temperature section of the environment temperature comprises: if the ambient temperature is less than or equal to the first preset temperature and greater than the difference value between the first preset temperature and the preset value, starting the heating device, and closing the cooling circulating water pump, the drain valve and the water replenishing valve; and if the ambient temperature is less than or equal to the difference value between the first preset temperature and the preset value, starting the heating device and the drain valve, and closing the cooling circulating water pump and the water supplementing valve.
If the environment temperature is less than or equal to a first preset temperature and greater than the difference value between the first preset temperature and a preset value, the heating device can be started, the cooling circulating water pump, the drain valve and the water replenishing valve are closed, and the cooling water circulating system is heated by the heating device to prevent the cooling water in the cooling water circulating system from being frosted and frozen; if the ambient temperature is less than or equal to the difference between the first preset temperature and the preset value, the temperature is relatively low at this time, and the cooling water cannot be effectively prevented from being frosted and frozen by heating, so that the heating device and the drain valve are started, the cooling circulating water pump and the water replenishing valve are closed, the cooling water is discharged, and the frosting and freezing are prevented, for example, the cooling water can be directly discharged to the ground through the drain valve. The preset value can be set according to requirements, for example, 2 ℃.
The embodiment further divides the interval which is less than or equal to the first preset temperature by using the preset value, and can carry out staged anti-freezing control on the cooling water circulation system by controlling the opening of the heating device and the drain valve based on the temperature interval of the current environment temperature, thereby effectively preventing the cooling water from frosting and freezing.
In one embodiment, after the heating device and the drain valve are turned on, the method further comprises: and when the liquid level in the water tank is detected to be 0 mm, the heating device and the drain valve are closed. Wherein, can set up the liquid level detector in the water tank to detect the liquid level in the water tank, when the liquid level is 0 millimeter to the drainage, in time close heating device and drain valve, in order to avoid heating device to continue to heat and cause the damage to the water tank under the condition that does not have water, and in time close heating device and can reduce the energy consumption.
In one embodiment, after the heating device and the drain valve are opened, and the cooling circulation water pump and the water replenishing valve are closed, the method further comprises the following steps: and when the environmental temperature is greater than the difference value between the first preset temperature and the preset value, opening the water replenishing valve until the liquid level in the water tank reaches the preset liquid level, and closing the water replenishing valve. The preset liquid level is a liquid level required by the normal work of the cooling water circulation system.
In this embodiment, when the ambient temperature rises to a temperature (i.e., a difference between the first preset temperature and the preset value) at which water needs to be drained, the water supply valve may be opened to supply cooling water to the water tank, so as to ensure that the cooling water circulation system can spray water to reduce the temperature of the refrigerant in the condenser when the compressor needs to refrigerate.
In one embodiment, after the heating device is turned on, the method further comprises: and when the ambient temperature is higher than the first preset temperature, closing the heating device. When the ambient temperature is higher than the first preset temperature, the working condition is not in the winter season, and at the moment, the heating device can be turned off without being prevented from freezing. This embodiment is based on the monitoring to ambient temperature, can in time close heating device, guarantees effectively to prevent frostbite and energy-conservation.
In view of the fact that the water chiller with natural cooling function consumes more energy to operate the cooling circulation water pump in the transition season, in one embodiment, after monitoring the ambient temperature of the condenser of the water chiller, the method further includes: if the ambient temperature is higher than the first preset temperature and lower than or equal to the second preset temperature, controlling the water chilling unit to work in a mixed refrigeration mode, and controlling the cooling circulating water pump to be switched on and off according to the ambient temperature; wherein, the mixed refrigeration mode is: and controlling the natural refrigeration circulation loop to refrigerate, and starting the compressor refrigeration circulation loop to supplement refrigeration when the refrigerating capacity provided by the natural refrigeration circulation loop cannot meet the refrigeration requirement.
The second preset temperature is a temperature threshold value used for judging the working condition, and can be set according to the weather condition of the area where the water chilling unit is located, and is greater than the first preset temperature, for example, the first preset temperature value is 0 ℃, and the second preset temperature value is 10 ℃. The operation working conditions of the water chilling unit are divided through the first preset temperature and the second preset temperature, the working conditions in summer, winter and transition seasons are distinguished, and the natural refrigeration circulation loop and the compressor refrigeration circulation loop in the water chilling unit are controlled according to different working conditions.
In this embodiment, ambient temperature is greater than first temperature of predetermineeing and is less than or equal to the second temperature of predetermineeing, the expression is in transition season operating mode, mainly refrigerate with natural refrigeration circulation circuit, when the refrigerating output that natural refrigeration circulation circuit provided can't satisfy the refrigeration demand (for example, along with ambient temperature's rising, the cold volume that natural refrigeration circulation circuit obtained from the air is less and less, lead to the refrigerating output not enough), open compressor refrigeration circulation circuit and carry out supplementary refrigeration, make full use of natural cooling function, thereby reduce the energy consumption of cooling water set under transition season operating mode. Specifically, a natural cooling water pump 8 and a cooling fan 11 are started to refrigerate the natural refrigeration circulation loop; when the compressor refrigeration circulation loop is needed to carry out supplementary refrigeration, the compressor 1 and the electronic expansion valve 3 are started, and the specific load of the compressor refrigeration circulation is controlled according to the outlet water temperature of the chilled water. Meanwhile, under the working condition of the transition season, the opening and closing of the cooling circulating water pump are controlled according to the ambient temperature, the cooling circulating water pump can be reasonably and effectively controlled, the running energy consumption of the cooling circulating water pump is reduced as much as possible, the energy-saving control is realized, and the problem of high running energy consumption under the working condition of the transition season is solved.
Further, the opening and closing of the cooling circulation water pump is controlled according to the ambient temperature, and the method comprises the following steps: if the ambient temperature is higher than the first preset temperature and lower than or equal to a third preset temperature, the cooling circulating water pump is closed; and if the ambient temperature is higher than the third preset temperature and lower than or equal to the second preset temperature, starting the cooling circulating water pump when the compressor refrigeration circulating loop needs to be started.
The third preset temperature is an intermediate value between the first preset temperature and the second preset temperature, and is used for finely dividing the interval from the first preset temperature to the second preset temperature so as to reasonably and effectively control the opening and closing of the cooling circulating water pump according to the subdivided interval. Preferably, the third preset temperature may take the following values: the first preset temperature + (the second preset temperature-the first preset temperature) × 0.5, and the third preset temperature is determined by calculating the first preset temperature and the second preset temperature, so that the interval can be more reasonably divided in detail.
If the ambient temperature is higher than the first preset temperature and lower than or equal to the third preset temperature, namely the ambient temperature is in a relatively low-temperature interval under the working condition of a transition season, the cooling circulating water pump is closed at the moment, and if supplementary refrigeration is needed by utilizing the compressor refrigeration circulating loop, the temperature of a refrigerant in the condenser can be reduced by utilizing the cooling fan 11 to exchange heat through external air due to relatively low temperature. If the ambient temperature is higher than the third preset temperature and lower than or equal to the second preset temperature, namely the ambient temperature is in a relatively high temperature interval under the working condition of a transition season, the temperature of the refrigerant in the condenser can be reduced only by spraying through a cooling water circulation system due to the fact that the temperature is relatively high and the temperature of the refrigerant in the condenser is not sufficiently reduced by the outside air.
This embodiment is under the season operating mode that passes through, based on the third temperature of predetermineeing to this interval of the second temperature of predetermineeing of the first temperature of predetermineeing finely dividing, according to the switching of the reasonable effective control cooling circulating water pump of subdivision interval, reduces the operation energy consumption of cooling circulating water pump under the season operating mode that passes through as far as possible for the complete machine consumption is the lowest, realizes energy-saving control.
After the environment temperature in which the condenser of the water chilling unit is located is monitored, the method further comprises the following steps: if the ambient temperature is higher than the second preset temperature, the ambient temperature is high, and the water chilling unit is in a working condition in summer, the water chilling unit is controlled to work in a compressor refrigeration circulation mode, namely, the compressor refrigeration circulation loop is controlled to refrigerate, the natural refrigeration circulation loop is controlled not to work, specifically, the compressor 1, the electronic expansion valve 3, the cooling circulation water pump 6 and the cooling fan 11 are started to enable the compressor refrigeration circulation loop to refrigerate, and the natural cooling water pump 8 is turned off to enable the natural refrigeration circulation loop not to work.
The control scheme of the water chilling unit is described below with reference to a specific embodiment, however, it should be noted that the specific embodiment is only for better describing the present application and is not to be construed as limiting the present application. The same or corresponding terms as those of the above-described embodiments are explained, and the description of the present embodiment is omitted.
Working conditions in winter
When the ambient temperature T is less than or equal to T2, the natural cooling mode (namely the natural refrigeration circulation mode) is operated:
natural refrigeration cycle mode: the natural cooling circulation refrigerating medium (such as glycol solution) is operated by 100 percent output through a circulation loop of a natural cooling water pump 8 → a natural cooling coil pipe 9 → a natural cooling plate exchange 10 → a natural cooling water pump 8, namely the required refrigerating capacity is provided by a natural refrigerating circulation mode;
compressor refrigeration cycle mode: the refrigerant operation is formed by a circulation loop consisting of the compressor 1 → the evaporative condenser 2 → the electronic expansion valve 3 → the evaporator 4 → the compressor 1, and the circulation loop is closed and stops operating;
circulating with chilled water for a user: the operation is carried out according to the steps of chilled water inlet → natural cooling plate exchange 10 → evaporator 4 → chilled water outlet.
Component operation control mode: starting a cooling fan 11 and a natural cooling water pump 8, and closing a cooling circulating water pump 6, a compressor 1 and an electronic expansion valve 3; the natural cooling water pump is used as a power source, heat in the natural cooling plate 10 is transferred to the outdoor natural cooling coil side through natural cooling circulating secondary refrigerant (such as ethylene glycol solution), and is discharged outdoors through the cooling fan 11, and therefore refrigeration is achieved.
Under the working condition in winter, when the natural refrigeration circulation loop is used for cooling, the cooling water circulation system needs to be subjected to anti-freezing control, and the specific explanation of the halt and anti-freezing is as follows:
the heating device 7 can be a self-temperature-limiting heat tracing band of a cooling water circulation system and is wound at the bottom of a water tank of the cooling water circulation system and on the surface of a water pipe. The bottommost part of the water level of the cooling water circulation system is provided with a liquid level switch (equivalent to the liquid level detector) for feeding back the water level, and an electric water valve which comprises an automatic drain valve and an automatic water replenishing valve is arranged and is opened or closed according to a control mainboard.
And when T is more than T2-2 and less than or equal to T2, the main board is controlled to judge, a command of opening the self-temperature-limiting heat tracing band of the cooling water circulation system is output, a command of closing the cooling circulation water pump 6, the automatic drain valve and the automatic water replenishing valve is output, and the cooling water circulation system is heated at the moment to prevent the cooling water inside from frosting and freezing.
And when T is less than or equal to T2-2, the frosting and freezing cannot be prevented by electric heating, the mainboard is controlled to judge, a command for opening the self-temperature-limiting heat tracing band and the automatic drain valve of the cooling water circulation system is output, and a command for closing the cooling water circulation pump 6 and the automatic water replenishing valve is output. When the water level of the water tank fed back by the liquid level switch is not available, the main board is controlled to output a command of closing the self-temperature-limiting heat tracing band of the cooling water circulation system. Specifically, water may be discharged directly through an automatic water discharge valve, for example, to the ground; when the environmental temperature rises to a certain value (such as more than T2-2 ℃), the automatic water replenishing valve is opened to replenish water.
When T is more than T2, the anti-freezing is stopped, namely the self-temperature-limiting heat tracing band of the cooling water circulation system is closed.
Referring to fig. 3, in order to provide an anti-freezing control schematic diagram according to an embodiment of the present invention, a user sends a unit start/stop command to a control main board through an operation panel, the control main board starts anti-freezing control when monitoring that an ambient temperature is less than or equal to T2, controls opening and closing of a heat tracing band, a drain valve, and a water supply valve according to a specific temperature interval of the ambient temperature, and simultaneously closes a cooling circulation water pump. After the drainage valve is used for draining water, the liquid level height in the water tank can be monitored through the liquid level switch, so that the drainage valve and the heat tracing band can be closed in time.
Second, transient season condition
Under the working condition, the anti-freezing control of a cooling water circulation system is not needed, and the energy-saving control of a water pump and a fan can be performed.
When T1 is more than T and more than T2, the mixed refrigeration mode is operated:
natural refrigeration cycle mode: the natural cooling circulation refrigerating medium (such as glycol solution) is circulated by a natural cooling water pump 8 → a natural cooling coil pipe 9 → a natural cooling plate 10 → a natural cooling water pump 8, 100% output is carried out for operation, and natural refrigeration is taken as the main part;
compressor refrigeration cycle mode: the refrigerant operation comprises a circulating loop formed by the compressor 1 → the evaporative condenser 2 → the electronic expansion valve 3 → the evaporator 4 → the compressor 1, and the operation is carried out by the partial load output of 0-25% -50% -75% -100% so as to carry out supplementary refrigeration;
circulating with chilled water for a user: the operation is carried out according to the steps of chilled water inlet → natural cooling plate exchange 10 → evaporator 4 → chilled water outlet.
In the transition season, the natural refrigeration circulation mode is preferentially used, but as the ambient temperature rises, the natural cooling has less and less cold energy available from the air, and when the cold energy is insufficient, the compressor refrigeration circulation needs to be used for supplementing. The compressor refrigeration cycle may only require a partial load to achieve the user's refrigeration requirement. The specific load of the refrigeration cycle of the compressor can be controlled according to the outlet water temperature of the chilled water, the cold requirement of a user is reflected in the outlet water temperature of the chilled water of the evaporator, if the outlet water temperature of the chilled water is higher, the cold of the natural refrigeration cycle is insufficient, and the compressor is loaded or operates in an additive frequency mode; if the temperature of the outlet water of the chilled water is lower, the cold quantity of the natural refrigeration cycle is too much, and the compressor is unloaded or operates in a frequency reduction mode.
Under the working condition of the transition season, the opening state of the cooling circulating water pump 6 can be determined by the ambient temperature, so that the energy-saving control is realized.
(1) When T is more than T2 and less than or equal to T2+ (T1-T2) multiplied by 0.5, the component action control mode is as follows: starting a cooling fan 11 and a natural cooling water pump 8, carrying out frequency conversion partial load operation on a compressor 1 and an electronic expansion valve 3, and closing a cooling circulating water pump 6;
(2) when T2+ (T1-T2) multiplied by 0.5 is more than T and less than or equal to T1, the component action control mode is as follows: and (3) starting a cooling fan 11 and a natural cooling water pump 8, carrying out frequency conversion partial load operation on the compressor 1 and the electronic expansion valve 3, and starting the cooling circulating water pump 6.
Under the working condition of a transition season, the opening and closing of the cooling circulating water pump 6 are controlled in a partitioned mode by setting an intermediate temperature value, namely T2+ (T1-T2) multiplied by 0.5, so that energy-saving control is achieved. When the environmental temperature is in a low-temperature interval, the cooling circulating water pump 6 is closed, spraying is not carried out, heat emitted by the evaporative condenser can be taken away through low-temperature natural wind, and energy consumption of starting and running of the cooling circulating water pump 6 is reduced; when the environment temperature is in a high-temperature interval, the cooling circulating water pump 6 is turned on to ensure the smooth heat exchange of the evaporative condenser, so that the lowest power consumption of the whole machine function can be met.
Working conditions in summer and summer
The anti-freezing control of the cooling water circulation system is not required under the working condition.
When T > T1, the compressor refrigeration cycle mode is operated:
compressor refrigeration cycle mode: the refrigerant operation is performed by a circulation loop formed by the compressor 1 → the evaporative condenser 2 → the electronic expansion valve 3 → the evaporator 4 → the compressor 1, and the operation is performed by 100% output;
natural refrigeration cycle mode: a natural cooling circulating refrigerating medium (such as glycol solution) is circulated in a loop of the natural cooling water pump 8 → the natural cooling coil 9 → the natural cooling plate 10 → the natural cooling water pump 8, and the loop is closed and stopped;
circulating with chilled water for a user: the operation is carried out according to the steps of chilled water inlet → natural cooling plate exchange 10 → evaporator 4 → chilled water outlet.
Component operation control mode: and (3) starting the cooling circulating water pump 6, the cooling fan 11, the compressor 1 and the electronic expansion valve 3, and closing the natural cooling water pump 8.
It should be noted that T1 (corresponding to the second preset temperature) and T2 (corresponding to the first preset temperature) are preset temperatures in the compressor refrigeration cycle mode and the natural refrigeration cycle mode, respectively, and T1 > T2.
This embodiment can realize the high-efficient operation under the multiplex condition, and can effectively prevent cooling water circulating system frosting and freeze under the season operating mode in winter, and the operating energy consumption of the reducible cooling circulation water pump of operating mode realizes better energy-conserving effect in transition season.
For example, T1 is 10 ℃, T2 is 0 ℃, and the operation under each particular condition is shown in the table below.
Table 1 running condition description table for water chilling unit under each working condition
Based on the same inventive concept, the embodiment of the invention also provides a control device of the water chilling unit, which can be used for realizing the control method of the water chilling unit in the embodiment. The chiller control may be implemented in software and/or hardware, and may generally be integrated into the chiller controller. The water chilling unit comprises a natural refrigeration circulation loop and a compressor refrigeration circulation loop, and a cooling water circulation system in the compressor refrigeration circulation loop is provided with an anti-freezing device.
Fig. 4 is a block diagram of a structure of a control device of a cooling water unit according to an embodiment of the present invention, and as shown in fig. 4, the control device of the cooling water unit includes:
the monitoring module 41 is used for monitoring the ambient temperature of a condenser of the water chilling unit;
and the first control module 42 is configured to control the natural refrigeration cycle to refrigerate, close the compressor refrigeration cycle, and control the anti-freezing device to prevent freezing according to the ambient temperature if the ambient temperature is less than or equal to a first preset temperature.
Optionally, the cooling water circulation system includes: the cooling circulating water pump is connected with the spray header; the anti-freezing device comprises: the heating device, the drain valve and the water replenishing valve; the heating device is arranged on the water tank and the connecting pipeline, and the drain valve and the water replenishing valve are both arranged on the water tank. The first control module 42 includes: and the control unit is used for controlling the heating device, the drain valve and the water replenishing valve to be opened and closed according to the temperature interval where the environment temperature is located.
Optionally, the control unit includes:
the first control subunit is configured to, if the ambient temperature is less than or equal to the first preset temperature and greater than a difference between the first preset temperature and a preset value, turn on the heating device, and turn off the cooling circulation water pump, the drain valve, and the water replenishment valve;
and the second control subunit is used for starting the heating device and the drain valve and closing the cooling circulating water pump and the water replenishing valve if the environmental temperature is less than or equal to the difference value between the first preset temperature and the preset value.
Optionally, the second control subunit is further configured to: after the heating device and the drain valve are opened, when the liquid level in the water tank is detected to be 0 mm, the heating device and the drain valve are closed.
Optionally, the second control subunit is further configured to: after the heating device and the drain valve are started, the cooling circulating water pump and the water replenishing valve are closed, when the environment temperature is higher than the difference value between the first preset temperature and the preset value, the water replenishing valve is opened until the liquid level in the water tank reaches the preset liquid level, and then the water replenishing valve is closed.
Optionally, the first control subunit and the second control subunit are both configured to: after the heating device is started, when the environment temperature is higher than the first preset temperature, the heating device is closed.
Optionally, the control device of the water chilling unit further includes:
the second control module is used for controlling the water chilling unit to work in a mixed refrigeration mode and controlling a cooling circulating water pump to be switched on and off according to the environment temperature if the environment temperature is higher than the first preset temperature and lower than or equal to a second preset temperature after the environment temperature of a condenser of the water chilling unit is monitored; wherein the mixed refrigeration mode is: and controlling the natural refrigeration circulation loop to refrigerate, and starting the compressor refrigeration circulation loop to supplement refrigeration when the refrigerating capacity provided by the natural refrigeration circulation loop cannot meet the refrigeration requirement.
Optionally, the second control module is specifically configured to:
if the environment temperature is higher than the first preset temperature and lower than or equal to a third preset temperature, closing the cooling circulating water pump;
and if the ambient temperature is higher than the third preset temperature and lower than or equal to the second preset temperature, starting the cooling circulating water pump when the compressor refrigeration circulating loop needs to be started.
Optionally, the third preset temperature is: the first preset temperature + (the second preset temperature-the first preset temperature) × 0.5.
The water cooling unit control device can execute the method provided by the embodiment of the invention and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
An embodiment of the present invention further provides a water chilling unit, including: the cooling water unit control device comprises a natural refrigeration circulation loop, a compressor refrigeration circulation loop and the cooling water unit control device in the embodiment, wherein a cooling water circulation system in the compressor refrigeration circulation loop is provided with an anti-freezing device.
Optionally, the cooling water circulation system comprises: the cooling circulating water pump is connected with the spray header; the freeze-proof device includes: the heating device, the drain valve and the water replenishing valve; the heating device is arranged on the water tank and the connecting pipeline, and the drain valve and the water replenishing valve are both arranged on the water tank.
Optionally, the anti-freezing device further comprises: and the liquid level detector is arranged inside the water tank and used for detecting the liquid level in the water tank.
The water chilling unit can execute the method provided by the embodiment of the invention and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
An embodiment of the present invention further provides an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to implement the chiller control method according to the above embodiment.
The embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the method for controlling a water chilling unit according to the embodiment is implemented.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (12)
1. A control method of a water chiller including a natural refrigeration cycle circuit and a compressor refrigeration cycle circuit, characterized in that a cooling water circulation system in the compressor refrigeration cycle circuit is provided with an anti-freezing device, the method comprising:
monitoring the ambient temperature of a condenser of the water chilling unit;
if the environment temperature is less than or equal to a first preset temperature, controlling the natural refrigeration circulation loop to refrigerate, closing the compressor refrigeration circulation loop, and controlling the anti-freezing device to freeze according to the environment temperature;
the cooling water circulation system includes: the cooling circulating water pump is connected with the spray header; the anti-freezing device comprises: the heating device, the drain valve and the water replenishing valve; the heating device is arranged on the water tank and the connecting pipeline, and the drain valve and the water replenishing valve are both arranged on the water tank;
controlling the anti-freeze apparatus according to the ambient temperature, comprising:
controlling the heating device, the drain valve and the water replenishing valve to be opened and closed according to the temperature interval of the environment temperature;
according to the temperature interval that ambient temperature is located, control heating device, drain valve with the switching of moisturizing valve includes:
if the environment temperature is less than or equal to the first preset temperature and greater than the difference value between the first preset temperature and a preset value, the heating device is started, and the cooling circulating water pump, the drain valve and the water replenishing valve are closed;
and if the environment temperature is less than or equal to the difference value between the first preset temperature and the preset value, starting the heating device and the drain valve, and closing the cooling circulating water pump and the water replenishing valve.
2. The method of claim 1, further comprising, after the heating device and the drain valve are turned on:
and when the liquid level in the water tank is detected to be 0 mm, the heating device and the drain valve are closed.
3. The method of claim 1, further comprising, after the heating device and the drain valve are turned on and the cooling cycle water pump and the makeup water valve are turned off:
and when the environment temperature is greater than the difference value between the first preset temperature and the preset value, opening the water replenishing valve until the liquid level in the water tank reaches the preset liquid level, and closing the water replenishing valve.
4. The method of claim 1, further comprising, after turning on the heating device:
and when the environment temperature is higher than the first preset temperature, closing the heating device.
5. The method of any one of claims 1 to 4, further comprising, after monitoring the ambient temperature at which the chiller's condenser is located:
if the ambient temperature is higher than the first preset temperature and lower than or equal to a second preset temperature, controlling the water chilling unit to work in a mixed refrigeration mode, and controlling the cooling circulating water pump to be switched on and off according to the ambient temperature;
wherein the mixed refrigeration mode is: and controlling the natural refrigeration circulation loop to refrigerate, and starting the compressor refrigeration circulation loop to supplement refrigeration when the refrigerating capacity provided by the natural refrigeration circulation loop cannot meet the refrigeration requirement.
6. The method of claim 5, wherein controlling the cooling cycle water pump to turn on and off according to the ambient temperature comprises:
if the environment temperature is higher than the first preset temperature and lower than or equal to a third preset temperature, closing the cooling circulating water pump;
and if the ambient temperature is higher than the third preset temperature and lower than or equal to the second preset temperature, starting the cooling circulating water pump when the compressor refrigeration circulating loop needs to be started.
7. The method of claim 6, wherein the third predetermined temperature is: the first preset temperature + (the second preset temperature-the first preset temperature) × 0.5.
8. A control device of a water chilling unit, the water chilling unit comprises a natural refrigeration circulation loop and a compressor refrigeration circulation loop, and is characterized in that a cooling water circulation system in the compressor refrigeration circulation loop is provided with an anti-freezing device, and the control device of the water chilling unit comprises:
the monitoring module is used for monitoring the ambient temperature of a condenser of the water chilling unit;
the first control module is used for controlling the natural refrigeration circulation loop to refrigerate, closing the compressor refrigeration circulation loop and controlling the anti-freezing device to freeze according to the ambient temperature if the ambient temperature is less than or equal to a first preset temperature;
the cooling water circulation system includes: the cooling circulating water pump is connected with the spray header; the anti-freezing device comprises: the heating device, the drain valve and the water replenishing valve; the heating device is arranged on the water tank and the connecting pipeline, and the drain valve and the water replenishing valve are both arranged on the water tank;
the first control module includes: the control unit is used for controlling the heating device, the drain valve and the water replenishing valve to be opened and closed according to the temperature interval of the environment temperature;
the control unit includes:
the first control subunit is configured to, if the ambient temperature is less than or equal to the first preset temperature and greater than a difference between the first preset temperature and a preset value, turn on the heating device, and turn off the cooling circulation water pump, the drain valve, and the water replenishment valve;
and the second control subunit is used for starting the heating device and the drain valve and closing the cooling circulating water pump and the water replenishing valve if the environmental temperature is less than or equal to the difference value between the first preset temperature and the preset value.
9. A chiller, comprising: a natural refrigeration cycle circuit, a compressor refrigeration cycle circuit, and the chiller control device of claim 8, wherein a cooling water circulation system in the compressor refrigeration cycle circuit is provided with an anti-freeze device.
10. The chiller according to claim 9, wherein said cooling water circulation system comprises: the cooling circulating water pump is connected with the spray header; the anti-freezing device comprises: the heating device, the drain valve and the water replenishing valve; the heating device is arranged on the water tank and the connecting pipeline, and the drain valve and the water replenishing valve are both arranged on the water tank.
11. The water chilling unit according to claim 10, wherein the anti-freeze further comprises: and the liquid level detector is arranged inside the water tank and used for detecting the liquid level in the water tank.
12. A computer-readable storage medium on which a computer program is stored, the program realizing the water chiller control method according to any one of claims 1 to 7 when executed by a processor.
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| CN114198951B (en) * | 2021-05-31 | 2023-07-28 | 浙江青风环境股份有限公司 | Double-effect integrated refrigerating unit with natural cooling function and refrigerating method thereof |
| CN113654212A (en) * | 2021-08-16 | 2021-11-16 | 珠海格力电器股份有限公司 | Refrigeration control method and device and refrigeration equipment |
| CN113499670A (en) * | 2021-08-25 | 2021-10-15 | 鼎信阳光环境技术有限公司 | Automatic anti-freezing spraying device suitable for north |
| CN113701056A (en) * | 2021-08-31 | 2021-11-26 | 广东美的制冷设备有限公司 | Hydraulic module, control method thereof and computer-readable storage medium |
| CN114992778B (en) * | 2022-05-23 | 2024-02-20 | 青岛海尔空调电子有限公司 | Anti-freezing control method of air conditioning unit |
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| US4910971A (en) * | 1988-02-05 | 1990-03-27 | Hydro Thermal Engineering Pty. Ltd. | Indirect air conditioning system |
| CN101988722A (en) * | 2010-10-27 | 2011-03-23 | 郭海新 | Natural cold source cooling water chiller |
| CN202002246U (en) * | 2011-04-19 | 2011-10-05 | 广州市华德工业有限公司 | Natural cooling cold water unit |
| CN103344023B (en) * | 2013-07-15 | 2016-08-17 | 江苏省邮电规划设计院有限责任公司 | A kind of electronic information machine room coupling-type cooling system |
| CN204786930U (en) * | 2015-03-02 | 2015-11-18 | 南京恒标斯瑞冷冻机械制造有限公司 | Evaporation cooling formula cooling water set prevents frostbite |
| CN106642770B (en) * | 2016-11-23 | 2022-09-30 | 广东申菱环境系统股份有限公司 | Double-cooling water chilling unit and control method thereof |
| CN206387137U (en) * | 2016-11-30 | 2017-08-08 | 珠海格力电器股份有限公司 | Refrigeration system |
| CN206803543U (en) * | 2017-03-16 | 2017-12-26 | 上海电气开利能源工程有限公司 | Anti-freeze type handpiece Water Chilling Units |
| CN208170609U (en) * | 2018-05-16 | 2018-11-30 | 江铃汽车股份有限公司 | A kind of water cooler |
| CN109028466A (en) * | 2018-06-12 | 2018-12-18 | 重庆美的通用制冷设备有限公司 | The antifreeze method, apparatus and system of air-conditioner set, evaporator |
| CN112066496A (en) * | 2020-09-21 | 2020-12-11 | 珠海格力电器股份有限公司 | Evaporation cooling unit, control method thereof and refrigeration equipment |
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