CN115235051B - Double-control cooling water control system - Google Patents
Double-control cooling water control system Download PDFInfo
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- CN115235051B CN115235051B CN202210893522.3A CN202210893522A CN115235051B CN 115235051 B CN115235051 B CN 115235051B CN 202210893522 A CN202210893522 A CN 202210893522A CN 115235051 B CN115235051 B CN 115235051B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- 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
- 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
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
- F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention provides a double-control cooling water control system, wherein a water chiller comprises an evaporator, a compressor and a condenser which are sequentially connected, the evaporator is connected with a chilled water circulation pipeline, the chilled water circulation pipeline comprises a chilled pump and a chilled water pipeline, the condenser is connected with a cooling water circulation pipeline, the cooling water circulation pipeline comprises a cooling pump, a cooling water pipeline and a cooling tower, the control system comprises a parameter acquisition module, a calculation module, a controller and a frequency converter, cooling and heat dissipation of the water chiller are realized on the premise of meeting cold load, the comprehensive electricity consumption of the cooling pump and the cooling tower is lowest on the premise of ensuring the highest COP of the water chiller, and the branch target of heat dissipation in a machine room is reached. The invention has a passive cooling mode, realizes the maximum utilization of an air cold source, thereby improving the COP value of a cooling system and saving more energy.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a double-control cooling water control system.
Background
The water-cooled cooling system of the existing central air conditioner mainly adjusts the frequency of a cooling pump or the number of opened cooling towers according to the temperature difference between outlet water and return water of cooling water so as to achieve the purpose of efficiently cooling the system. The cooling pump conveys cooling water heated by the condenser of the water chiller to the cooling tower for heat dissipation, then returns to the condenser for heat absorption and temperature rise, and then returns to the cooling tower for heat dissipation and temperature reduction, and the purpose of cooling the system is achieved in a circulating reciprocating manner.
However, the adjustment of the frequency of the cooling pump, the reduction of the cooling water flow and the saving of the power consumption of the cooling pump can cause poor heat dissipation effect of the compressor unit of the water chiller of the central air conditioner, COP (coefficient of performance) reduction and energy consumption increase, and the electric energy saved by the cooling pump is not enough to increase the power consumption of the compressor unit of the water chiller.
The number of the opened cooling towers is adjusted, the heat dissipation area of the cooling towers and the power consumption of the fan motor are reduced, the heat dissipation effect of the compressor unit of the water chiller of the central air conditioner is poor, the COP is reduced, the energy consumption is increased, and the electric quantity saved by the heat dissipation fan motor is not enough to increase the power consumption of the compressor unit of the water chiller.
Disclosure of Invention
The invention mainly aims to provide a double-control cooling water control system which can optimally meet the cooling and heat dissipation requirements of a water chiller and ensure that the total energy consumption of a cooling pump and a cooling tower is the lowest on the premise of ensuring the highest COP of the water chiller.
The invention also aims to provide a double-control cooling water control system, which realizes intelligent temperature increase of cooling water, ensures normal work of a cooling medium cooling system of a magnetic suspension compressor, realizes intelligent automatic loading starting, effectively protects the compressor from being damaged and ensures smooth startup production from being influenced.
The technical scheme adopted by the invention is as follows: a double-control cooling water control system is characterized in that a water chiller applied by the system comprises an evaporator, a compressor and a condenser which are sequentially connected, the evaporator is connected with a cooling water circulation pipeline, the cooling water circulation pipeline comprises a freezing pump and a freezing water pipeline, the condenser is connected with a cooling water circulation pipeline, the cooling water circulation pipeline comprises a cooling pump, a cooling water pipeline and a cooling tower, the control system comprises a parameter acquisition module, a calculation module, a controller and a frequency converter, the parameter acquisition module is used for acquiring the output cold quantity of the water chiller, the input electric quantity of the water chiller, the acquired inlet and outlet temperature and flow of the freezing water of the evaporator and the acquired inlet and outlet temperature and flow of the cooling water of the condenser, and acquiring the heat dissipation outlet air temperature and the environment wet bulb temperature of the cooling tower, the frequency converter is used for adjusting and controlling the operating frequency of the cooling pump and the cooling tower, the calculation module is used for calculating the optimal operating frequency of the cooling pump and the cooling tower and sending the optimal operating frequency to the frequency converter as the cooling pump and the operating frequency of the cooling tower, and the controller is respectively electrically connected with the parameter acquisition module and the calculation module and is used for controlling the opening and closing of the cooling tower.
The calculation module is used for establishing a mathematical model and calculating the optimal operating frequency of the cooling pump and the optimal operating frequency of the cooling tower by using the output cold quantity of the water cooler and the input electric quantity of the water cooler, the acquired chilled water inlet and outlet water temperature and flow of the evaporator, the acquired chilled water inlet and outlet water temperature and flow of the condenser, and the acquired air temperature of the heat dissipation outlet of the cooling tower and the environmental wet bulb temperature.
The calculation formula of the mathematical model is as follows:
cooling water heat dissipation capacity Q1= ∑ cooling water flow rate =:coolingwater temperature difference:coolingwater specific heat;
cooling tower heat dissipation Q2= Sigma cooling air volume = cooling air temperature difference = air specific heat;
the refrigerating capacity Q of the water chiller is not less than sigma chilled water quantity, chilled water temperature difference and chilled water specific heat;
the electric quantity P of the water chiller is not larger than the sigma input power and the time;
the cooling water temperature set point T = ambient wet bulb temperature +3 deg.c
When the optimal frequency of the cooling pump and the cooling tower motor is calculated, the following conditions are met: p + Q = Q1, the cooling water temperature difference is equal to the preset cooling water temperature difference and the condition two: q1= Q2, the cooling water temperature is equal to the cooling water temperature set value;
the optimal energy-saving operation frequency of the cooling pump is as follows: f1= (q 1/rated flow) × 50;
q1 is a minimum flow value of the cooling water calculated according to the heat dissipation capacity Q1 of the cooling water under the condition that the temperature difference between the inlet water and the outlet water of the cooling water is a preset cooling water temperature difference value;
the optimal energy-saving operation frequency of the cooling tower is f2= (Q2/rated heat dissipation capacity of the cooling tower) × 50.
And the total COP = cold output quantity of the water chiller/(power consumption of the water chiller + power consumption of the cooling pump + power consumption of the cooling tower + power consumption of the refrigerating pump).
When the environment wet bulb temperature acquired by the parameter acquisition module is lower than a first preset environment wet bulb temperature, the water chiller enters a passive cooling mode.
And when the environment wet bulb temperature acquired by the parameter acquisition module is lower than a second preset environment wet bulb temperature, the water chiller enters a natural cooling mode.
In the passive cooling mode, the cooling tower is closed through the controller, the cooling tower is prompted to enter a passive cooling operation state, and meanwhile, when the calculation module calculates that Q + P = Q1 according to the established mathematical model, the cooling tower is restarted.
The natural cooling mode is that the water chiller is closed through the controller, the freezing water pipe is enabled to be automatically switched to the cooling water circulation pipeline, the freezing water is cooled through the cooling tower to run, and meanwhile, when the calculation module calculates that Q + P = Q2 according to the established mathematical model, the water chiller is restarted.
The control system further comprises a bypass pipeline, the bypass pipeline is connected between an inlet and an outlet of the condenser, and the parameter acquisition module can also be used for acquiring a compression ratio, a temperature difference value between cooling water temperature in the cooling water circulation pipeline and freezing water temperature in the freezing water circulation pipeline, so that the controller can control the opening and closing of the bypass pipeline or control the opening and closing of the cooling tower according to the acquired compression ratio or temperature difference value.
When the compression ratio acquired by the parameter acquisition module is smaller than or equal to the preset target pressure ratio or the acquired temperature difference value is smaller than the preset target temperature difference value, the bypass pipeline is opened and the cooling tower is closed through the controller, and when the compression ratio acquired by the parameter acquisition module is larger than the preset target pressure ratio or the acquired temperature difference value is larger than or equal to the preset target temperature difference value, the bypass pipeline is controlled to be closed and the cooling tower is opened through the controller.
The bypass pipeline comprises a bypass pipe and a bypass electric valve, the bypass pipe is connected between the inlet and the outlet of the condenser, and the bypass electric valve is arranged in the bypass pipe.
The invention has the advantages that
1. On the premise of meeting the cold load, the cooling heat dissipation of the water chiller can be efficiently realized, and the comprehensive electricity consumption of a cooling pump and a cooling tower is the lowest on the premise of ensuring the highest COP of the water chiller, so that the branch target of efficient heat dissipation in an efficient machine room is achieved.
2 the invention has a passive cooling mode, thus realizing the maximum utilization of air cold source. Thereby increasing the COP value of the cooling system. The energy is saved and the efficiency is high.
3. The invention has a natural cooling mode, and because the cold water machine is directly cooled and switched into the cooling tower for cooling and refrigeration when a cold source is needed in a building or a production process, the invention realizes natural cooling and provides a cold source with lower cost for the building and the production process by utilizing the cold source in the air to the maximum extent.
And 4, when the environmental temperature is lower in winter and transitional seasons, the cooling water bypass is used for automatically adjusting the high pressure ratio and the cooling water temperature, so that the magnetic suspension compressor is protected from being successfully started for refrigeration.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual size, emphasis instead being placed upon illustrating the subject matter.
FIG. 1 is a schematic diagram of the principles of the present invention;
FIG. 2 is a block diagram of the control principle of the present invention;
description of the preferred embodiment
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1-2, an embodiment of the present invention provides a dual-control cooling water control system, in which a water chiller includes an evaporator 12, a compressor 13, and a condenser 14, the evaporator 12 is connected to a chilled water circulation pipeline 11, the chilled water circulation pipeline 11 includes a chilled pump 111 and a chilled water pipeline 112, the condenser is connected to a cooling water circulation pipeline 15, the cooling water circulation pipeline 15 includes a cooling pump 151, a cooling water pipeline 152, and a cooling tower 153, the control system includes a parameter acquisition module 21, a calculation module 22, a controller 23, and a frequency converter 24, the parameter acquisition module 21 is respectively connected to the calculation module 22 and the controller 24, the calculation module 22 is respectively connected to the controller 23 and the frequency converter 24, the controller 23 is respectively connected to the cooling tower 153 and the cooling pump 151, the frequency converter is respectively connected with the cooling tower 153 and the cooling pump 151, the parameter acquisition module 21 is used for acquiring the output cold quantity and the input electric quantity of the water chiller in real time, the chilled water inlet and outlet water temperature and the flow of the evaporator 12, the chilled water inlet and outlet water temperature and the flow of the condenser, the heat dissipation outlet air temperature of the cooling tower and the environmental wet bulb temperature, the frequency converter 24 is used for adjusting and controlling the running frequency of the cooling pump and the cooling tower, the calculation module is used for calculating the optimal running frequency of the cooling pump and the cooling tower and sending the optimal running frequency to the frequency converter as the running frequency of the cooling pump and the cooling tower, the controller can control the closing of the water chiller and the cooling tower according to the environmental wet bulb temperature acquired by the parameter acquisition module 21 and can control the water chiller according to the calculation result of the calculation module, and opening the cooling tower.
And the computing module is used for sending the adjusting operation frequency of a cooling pump and a cooling tower to the frequency converter, and the frequency updating adjusting range is set to be 2 minutes to 10 minutes.
Specifically, the calculation module 22 establishes a mathematical model by using the output cold energy of the water chiller and the input electric quantity of the water chiller acquired by the parameter acquisition module 21, the acquired chilled water inlet and outlet water temperature and flow rate of the evaporator 12, the acquired cooling water inlet and outlet water temperature and flow rate of the condenser 14, and the acquired heat dissipation outlet air temperature of the cooling tower and the environmental wet bulb temperature, and calculates the optimal operating frequency of the cooling pump and the optimal operating frequency of the cooling tower.
The calculation formula of the mathematical model is as follows:
cooling water heat dissipation quantity Q1= sigma cooling water flow quantity = cooling water temperature difference = cooling water specific heat;
cooling tower heat dissipation Q2= ∑ cooling air quantity = cooling air temperature difference = air specific heat;
the refrigerating capacity Q of the water chiller is not less than sigma chilled water quantity, chilled water temperature difference and chilled water specific heat;
specific heat of water = 4.2 x 10^3j/kg. DEG C
The cooling air temperature difference = the temperature of a cooling tower heat dissipation opening acquired in real time-the ambient wet bulb temperature, and the air specific heat = 1.0 x 10^3j/kg. DEG C
The electric quantity P of the water chiller is not larger than sigma input power time;
the cooling water temperature set point T = ambient wet bulb temperature +3 deg.c
When the optimal frequency of the cooling pump and the cooling tower motor is calculated, the following conditions are met: p + Q = Q1, the cooling water temperature difference is equal to the preset cooling water temperature difference and the condition two: q1= Q2, the cooling water temperature is equal to the cooling water temperature set value;
the optimal energy-saving operation frequency of the cooling pump is as follows: f1= (q 1/rated flow) × 50;
q1 is a minimum flow value of the cooling water calculated according to the heat dissipation capacity Q1 of the cooling water under the condition that the temperature difference between the inlet water and the outlet water of the cooling water is a preset cooling water temperature difference value;
the optimal energy-saving operation frequency of the cooling tower is f2= (Q2/rated heat dissipation capacity of the cooling tower) = 50.
The comprehensive COP = cold output quantity of the water chiller/(power consumption of the water chiller + power consumption of the cooling pump + power consumption of the cooling tower + power consumption of the refrigerating pump), and the smaller the sum of the power consumption of the cooling pump + the power consumption of the cooling tower is, the higher the comprehensive COP is, and the minimum value of the combination of the two is found to be the optimal operation frequency under the condition that the water chiller outputs the same cold quantity.
The difference between the preset cooling water temperatures is 5 ℃.
Further, when the environmental wet bulb temperature collected by the parameter collecting module 21 is lower than a first preset environmental wet bulb temperature, the water chiller enters a passive cooling mode.
Further, when the environmental wet bulb temperature collected by the parameter collecting module 21 is lower than a second preset environmental wet bulb temperature, the water chiller enters a natural cooling mode.
In the passive cooling mode, the cooling tower is closed by the controller 23, so that the cooling tower 153 is forced to enter a passive cooling (natural cooling by convection of cooling water depending on an air cooling source) operation state, and meanwhile, when the calculation module calculates Q + P = Q1 according to the established mathematical model, the cooling tower is restarted.
In the natural cooling mode, the water chiller is turned off by the controller 23, the chilled water pipe is automatically switched to the cooling water circulation pipeline, the chilled water is cooled by the cooling tower (the chilled water is cooled by the air cold source), and meanwhile, the water chiller is turned on again when the calculation module calculates that Q + P = Q2 according to the established mathematical model.
Note that the first predetermined ambient wet bulb temperature is 20 deg.c and the second predetermined ambient wet bulb temperature is 15 deg.c.
The control system further comprises a bypass pipeline 25, the bypass pipeline 25 is connected between an inlet and an outlet of the condenser, and the parameter acquisition module 21 can also be used for acquiring a compression ratio, a temperature difference value between cooling water temperature in the cooling water circulation pipeline and freezing water temperature in the freezing water circulation pipeline, so that the controller can control the opening and closing of the bypass pipeline or control the opening and closing of the cooling tower according to the acquired compression ratio or temperature difference value.
When the compression ratio acquired by the parameter acquisition module is smaller than or equal to the preset target pressure ratio or the acquired temperature difference value is smaller than the preset target temperature difference value, the bypass pipeline is opened and the cooling tower is closed through the controller, and when the compression ratio acquired by the parameter acquisition module is larger than the preset target pressure ratio or the acquired temperature difference value is larger than or equal to the preset target temperature difference value, the bypass pipeline is controlled to be closed and the cooling tower is opened through the controller.
The bypass line 25 includes a bypass pipe 251 and a bypass electric valve 252, the bypass pipe 252 is connected between the inlet and the outlet of the condenser 14, and the bypass electric valve is disposed in the bypass pipe 251.
In the present embodiment, the controller 22 controls the opening and closing of the bypass pipeline 21 by controlling the opening and closing of the bypass electric valve 212, and the controller 22 opens and closes the cooling tower by opening and closing the fan in the cooling tower. When the controller opens the bypass electric valve and closes the cooling tower, the pressure of the condenser is gradually increased because the cooling water cannot dissipate heat, the pressure ratio is continuously increased, when the pressure ratio reaches 2.0, the controller closes the bypass pipeline and opens the cooling tower, the cooling water flows through the cooling tower to dissipate heat, and the output cold quantity of the water chiller is continuously increased to a normal operation state.
The pressure ratio of the preset target is between 1.3 and 1.5, and the temperature difference value of the preset target is between 8 and 12 ℃.
Preferably, in the present embodiment, the preset target pressure ratio is preferably 1.5, and the preset target temperature difference is preferably 10 ℃.
The cooling tower exchanges heat with the chilled water circulation pipeline through the plate type heat exchange system in the natural cooling mode, so that the chilled water pipe network is prevented from being directly communicated with the cooling water pipe network, the cooling water pipe network is prevented from being polluted by cooling water to generate mud and dirt, and the tail end of the air conditioner is prevented from being blocked after long-term use.
The invention aims to realize that 1, on the premise of meeting the cold load of the water chiller, the cooling heat dissipation is efficiently realized, and on the premise of ensuring the highest COP of the water chiller, the comprehensive electricity consumption of a cooling pump and a cooling tower is the lowest, so that the branch target of efficient heat dissipation in an efficient machine room is achieved.
2 the invention has a passive cooling mode, realizes the maximum utilization of an air cold source, thereby improving the COP value of a cooling system and being more energy-saving and efficient.
3. The invention has a natural cooling mode, and because the cold water machine is directly cooled and switched into the cooling tower for cooling and refrigeration when a cold source is needed in a building or a production process, the invention realizes natural cooling and provides a cold source with lower cost for the building and the production process by utilizing the cold source in the air to the maximum extent.
4. When the environmental temperature is lower in winter and transitional seasons, the cooling water bypass is used for automatically adjusting the high pressure ratio and the cooling water temperature, so that the magnetic suspension compressor is protected from being successfully started for refrigeration.
In this application, unless expressly stated or limited otherwise, 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 intervening media. 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, reference to the description of the terms "preferred embodiment," "yet another embodiment," "other embodiments," or "specific examples," etc., means 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 application. 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 application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (8)
1. The utility model provides a two accuse formula cooling water control system, its cold water machine of using is including connecting gradually evaporimeter, compressor, condenser, the evaporimeter is connected with chilled water circulation pipeline, chilled water circulation pipeline includes freeze pump, frozen water pipeline, the condenser is connected with cooling water circulation pipeline, cooling water circulation pipeline includes cooling pump, cooling water pipeline, cooling tower, its characterized in that: the control system comprises a parameter acquisition module, a calculation module, a controller and a frequency converter, wherein the parameter acquisition module is respectively connected with the calculation module and the controller, the calculation module is respectively connected with the controller and the frequency converter, the controller is respectively connected with the cooling tower and the cooling pump, the frequency converter is respectively connected with the cooling tower and the cooling pump, the parameter acquisition module is used for acquiring the output cold quantity and the input electric quantity of the water chiller, the chilled water inlet and outlet temperature and flow of the evaporator, the chilled water inlet and outlet temperature and flow of the condenser, the heat dissipation outlet air temperature and the environment wet bulb temperature of the cooling tower, the frequency converter is used for adjusting and controlling the running frequency of the cooling pump and the cooling tower, the calculation module is used for calculating the optimal running frequency of the cooling pump and the cooling tower and sending the optimal running frequency to the frequency converter as the running frequency of the cooling pump and the cooling tower, and the controller can control the closing of the water chiller and the cooling tower and the opening of the water chiller according to the calculation result of the calculation module,
the calculation module establishes a mathematical model through the output cold quantity of the water cooler and the input electric quantity of the water cooler, the temperature and the flow of the chilled water inlet and outlet water of the evaporator, the temperature and the flow of the chilled water inlet and outlet water of the condenser, the temperature of the air at the heat dissipation outlet of the cooling tower and the temperature of the environmental wet bulb, which are acquired by the parameter acquisition module, and calculates the optimal operating frequency of the cooling pump and the optimal operating frequency of the cooling tower,
the calculation formula of the mathematical model is as follows:
cooling water heat dissipation capacity Q1= ∑ cooling water flow rate =:coolingwater temperature difference:coolingwater specific heat;
cooling tower heat dissipation Q2= Sigma cooling air volume = cooling air temperature difference = air specific heat;
the refrigerating capacity Q of the water chiller is not less than sigma chilled water quantity, chilled water temperature difference and chilled water specific heat;
the electric quantity P of the water chiller is not larger than sigma input power time;
the cooling water temperature set point T = ambient wet bulb temperature +3 deg.c
When the optimal frequency of the cooling pump and the cooling tower motor is calculated, the following conditions are met: p + Q = Q1, the cooling water temperature difference is equal to the preset cooling water temperature difference and the condition two: q1= Q2, the cooling water temperature is equal to the cooling water temperature set value;
the optimal energy-saving operation frequency of the cooling pump is as follows: f1= (q 1/rated flow) × 50;
q1 is a minimum flow value of the cooling water calculated according to the heat dissipation capacity Q1 of the cooling water under the condition that the temperature difference between the inlet water and the outlet water of the cooling water is a preset cooling water temperature difference value;
the optimal energy-saving operation frequency of the cooling tower is f2= (Q2/rated heat dissipation capacity of the cooling tower) × 50;
and the total COP = cold output quantity of the water chiller/(power consumption of the water chiller + power consumption of the cooling pump + power consumption of the cooling tower + power consumption of the refrigerating pump).
2. The dual control cooling water control system of claim 1, wherein the water chiller enters a passive cooling mode when the ambient wet bulb temperature collected by the parameter collection module is below a first predetermined ambient wet bulb temperature.
3. The dual control cooling water control system of claim 1, wherein the water chiller enters a natural cooling mode when the ambient wet bulb temperature collected by the parameter collection module is below a second predetermined ambient wet bulb temperature.
4. The dual control cooling water control system according to claim 2, wherein the passive cooling mode is to turn off the cooling tower by the controller to cause the cooling tower to enter the passive cooling operation state, and the calculation module is to turn on the cooling tower again when Q + P = Q1 according to the calculation of the established mathematical model.
5. The dual control cooling water control system according to claim 3, wherein the natural cooling mode is to turn off the water chiller by the controller, to cause the chilled water pipe to be automatically switched to the cooling water circulation line, and the chilled water passes through the cooling tower to perform the cooling operation, and simultaneously, the calculation module turns on the water chiller again when Q + P = Q2 according to the calculation of the established mathematical model.
6. The dual-control cooling water control system according to claim 1, wherein the control system further comprises a bypass pipeline, the bypass pipeline is connected between the inlet and the outlet of the condenser, and the parameter acquisition module is further configured to acquire a compression ratio, a temperature difference between a cooling water temperature in the cooling water circulation pipeline and a chilled water temperature in the chilled water circulation pipeline, so that the controller can control the opening and closing of the bypass pipeline or the opening and closing of the cooling tower according to the acquired compression ratio or temperature difference.
7. The dual-control cooling water control system according to claim 6, wherein when the compression ratio collected by the parameter collection module is less than or equal to the preset target pressure ratio value or the collected temperature difference value is less than the preset target temperature difference value, the bypass pipeline is opened and the cooling tower is closed at the same time through the controller, and when the compression ratio collected by the parameter collection module is greater than the preset target pressure ratio value or the collected temperature difference value is greater than or equal to the preset target temperature difference value, the bypass pipeline is controlled to be closed and the cooling tower is opened at the same time through the controller.
8. The dual control cooling water control system according to claim 7, wherein the bypass line comprises a bypass pipe connected between the inlet and the outlet of the condenser, and a bypass electric valve disposed in the bypass pipe.
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