CN106839218B - Central air conditioning system energy efficiency lifting assembly and control method thereof - Google Patents

Central air conditioning system energy efficiency lifting assembly and control method thereof Download PDF

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Publication number
CN106839218B
CN106839218B CN201710144546.8A CN201710144546A CN106839218B CN 106839218 B CN106839218 B CN 106839218B CN 201710144546 A CN201710144546 A CN 201710144546A CN 106839218 B CN106839218 B CN 106839218B
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China
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water
electric valve
cooling
temperature
energy efficiency
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CN106839218A (en
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李承泳
蒋辉华
许宗金
谢辉优
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Shenzhen Das Intellitech Co Ltd
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Shenzhen Das Intellitech Co Ltd
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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
    • F24F5/0046—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 using natural energy, e.g. solar energy, energy from the ground
    • 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
    • F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
    • 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
    • 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
    • F24F2110/22—Humidity of the outside air
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Atmospheric Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

The invention discloses an air conditioning system energy efficiency lifting assembly and a control method, wherein the assembly comprises a cooling water circulation system, a water chilling unit energy efficiency lifting device and a cooling circulation system which are connected in sequence; the cooling water circulation system comprises a first cooling tower, the water chilling unit energy efficiency lifting device comprises a water-water heat exchanger and an evaporator, and the cooling circulation system comprises a tail end air conditioner; the first cooling tower is communicated with the water-water heat exchanger through a first water outlet pipe, a first water return pipe, so that cooling water of the first cooling tower is introduced into the water-water heat exchanger, the tail end air conditioner is respectively connected with the water-water heat exchanger and the evaporator through a second water outlet pipe and a second water return pipe, and meanwhile, the water-water heat exchanger is communicated with the evaporator through a communication pipeline; after the primary cooling of the tail end air conditioner is realized through the water-water heat exchanger, the secondary cooling is realized through the evaporator, the natural cold source cooling and cooling of the first cooling tower are fully utilized, the load of the evaporator is reduced, and the energy efficiency of the water chilling unit is improved.

Description

Central air conditioning system energy efficiency lifting assembly and control method thereof
Technical Field
The invention mainly relates to the technical field of central air conditioners, in particular to an energy efficiency improving assembly of a central air conditioning system and a control method thereof.
Background
With the structural reform of the stable promotion supply side in China, the industrial production presents a situation of slow centering and stable centering with advancing and stable centering and quality improvement. In order to keep the industrial production steadily increasing, reducing the energy cost of factory production is an effective cost-reducing measure, wherein the power consumption of the central air conditioner of the factory often accounts for 50% or more of the power consumption of the factory, so the reduction of the power consumption of the central air conditioner is the key to the reduction of the energy cost of production.
In industrial plants such as a semiconductor factory and a data machine room, the production operation process is realized by heating process equipment, so that the environment temperature and humidity in the production workshop can reach the environment required by production all the year round, and the central air conditioning system needs to be operated and refrigerated all the year round. The refrigeration is mainly carried out in a mode of evaporating and absorbing heat of the refrigerant in the evaporator, so that factors such as outdoor environment and the like are not comprehensively considered, an outdoor natural cold source is not fully utilized, and the energy efficiency of the water chilling unit cannot be improved.
Disclosure of Invention
The invention mainly aims to provide an air conditioning system energy efficiency lifting assembly and a control method thereof, and aims to solve the problem that a water chilling unit of an air conditioning system in the prior art does not fully utilize outdoor natural energy.
In order to achieve the above purpose, the air conditioning system energy efficiency lifting assembly provided by the invention comprises a cooling water circulation system (100), a water chilling unit energy efficiency lifting device (200) and a cooling circulation system (300) which are sequentially connected through pipelines;
The cooling water circulation system (100) comprises a first cooling tower (110), a first circulating water pump (120), and a first water outlet pipe (130) and a first water return pipe (140) which are communicated with the first cooling tower (100);
the water chiller energy efficiency lifting device (200) comprises a water-water heat exchanger (210) and an evaporator (220), wherein a first water inlet (211), a first water outlet (212), a second water inlet (214) and a second water outlet (213) are arranged on the water-water heat exchanger (210), a third water inlet (221) and a third water outlet (222) are arranged on the evaporator (220), a first water outlet pipe (130) is communicated with the first water inlet (211) through a first circulating water pump (120), a first water return pipe (140) is communicated with the first water outlet (212), and a second water outlet (213) is communicated with the third water inlet (221) through a communication pipeline;
the cooling circulation system (300) comprises a tail end air conditioner (310), a second circulating water pump (320), and a second water outlet pipe (330) and a second water return pipe (340) which are communicated with the tail end air conditioner (310), wherein the second water outlet pipe (330) is communicated with the second water inlet (214) through the second circulating water pump (320), and the second water return pipe (340) is communicated with the third water outlet (222).
Preferably, the second water outlet pipe (330) is provided with a first electric valve (1) and a second electric valve (2), the first end of the first electric valve (1) and the first end of the second electric valve (2) are connected in parallel to the second water outlet pipe (330), the second end of the first electric valve (1) is communicated with the second water inlet (214), and the second end of the second electric valve (2) is connected to a communication pipeline;
The second return pipe (340) is provided with a third electric valve (3) and a fourth electric valve (4), the first end of the third electric valve (3) and the first end of the fourth electric valve (4) are connected in parallel on the second return pipe, the second end of the third electric valve (3) is communicated with the third water outlet (222), and the second end of the fourth electric valve (4) is connected to a communication pipeline.
Preferably, the cooling water circulation system (100) further comprises a second cooling tower (160), a third circulating water pump (150), and a third water outlet pipe (170) and a third water return pipe (180) which are communicated with the second cooling tower (160), wherein a fifth electric valve (8) is arranged between the third water outlet pipe (170) and the third water return pipe (180), a first end of the fifth electric valve (8) is communicated with the third water outlet pipe (170), and a second end of the fifth electric valve (8) is communicated with the third water return pipe (180);
the water chilling unit energy efficiency lifting device (200) further comprises a condenser (230), a fourth water inlet (231) and a fourth water outlet (232) are arranged on the condenser (230), the fourth water inlet (231) is connected with the first end of the fifth electric valve (8) through the third circulating water pump (150), and the fourth water outlet (232) is connected with the second end of the fifth electromagnetic valve (8).
Preferably, the central air conditioning system energy efficiency lifting assembly further comprises a first temperature sensor (10) arranged on the first water outlet pipe (130), a second temperature sensor (9) arranged on the third water outlet pipe (170), a third temperature sensor (7) arranged on the communication pipeline, a fourth temperature sensor (5) arranged on the second water outlet pipe (330) and a fifth temperature sensor (6) arranged on the second water return pipe;
The central air conditioning system energy efficiency lifting assembly further comprises a first controller (13) and a second controller (12), wherein the first temperature sensor (10), the third temperature sensor (9), the fourth temperature sensor (5), the fifth temperature sensor (6), the first electric valve (1), the second electric valve (2), the third electric valve (3) and the fourth electric valve (4) are all connected with the first controller (13); the second controller (12) is connected with the second temperature sensor (9) and the fifth electric valve (8) to control the opening or closing of the fifth electric valve (8) according to the temperature detected by the second temperature sensor (9).
Preferably, the central air conditioning system energy efficiency lifting assembly further comprises an outdoor temperature and humidity sensor (11) connected with the first controller (13) and the second controller (12) respectively, the first controller (13) calculates the outdoor wet bulb temperature according to the outdoor temperature and the outdoor relative humidity detected by the outdoor temperature and humidity sensor (11), and the second controller (12) controls the first circulating water pump (120) to be started or stopped according to the outdoor wet bulb temperature.
In addition, in order to achieve the above object, the present invention further provides a control method of the central air conditioning system energy efficiency lifting assembly according to any one of the above objects, wherein the air conditioning outlet water pipe is provided with a first electric valve and a second electric valve, the second water return pipe is provided with a third electric valve and a fourth electric valve, the water chiller energy efficiency lifting device further comprises a condenser, and the control method of the central air conditioning system energy efficiency lifting assembly comprises the following steps:
Detecting the outdoor temperature and the outdoor relative humidity, and calculating the wet bulb temperature according to the outdoor temperature and the outdoor relative humidity;
when the inlet water temperature of the condenser is detected to be lower than a first preset value and the wet bulb temperature is detected to be lower than the preset wet bulb temperature value, the first circulating water pump is controlled to be started so as to introduce cooling water of the first cooling tower into the water-water heat exchanger to cool cold water of the tail-end air conditioner;
when the inlet water temperature of the first water inlet of the water-water heat exchanger is detected to be lower than a second preset value, the first electric valve is controlled to be opened, the second electric valve is controlled to be closed, the third electric valve is controlled to be opened, and the fourth electric valve is controlled to be closed, so that cold water of the tail end air conditioner is introduced into the water-water heat exchanger, and cooling water of the first cooling tower is subjected to primary cooling and then subjected to secondary cooling through the evaporator.
Preferably, when the detected inlet water temperature of the condenser is lower than a first preset value and the wet bulb temperature is lower than a preset wet bulb temperature value, the step of controlling the first circulating water pump to be started further comprises the following steps:
when the difference value between the detected cold water temperature of the communication pipeline and the detected return water temperature of the tail end air conditioner is smaller than a third preset value within a preset time period, and the wet bulb temperature is lower than the preset wet bulb temperature value, the first electric valve is controlled to be opened, the second electric valve is controlled to be closed, the third electric valve is controlled to be closed, and the fourth electric valve is controlled to be closed, so that cold water of the tail end air conditioner is introduced into the water-water heat exchanger, and the first-stage cooling is performed through the cooling water of the first cooling tower.
Preferably, the cooling water circulation system further comprises a second cooling tower, a third circulating water pump and a fifth electric valve, and the control method of the central air conditioning system energy efficiency lifting assembly further comprises the steps of:
when the inlet water temperature of the condenser is detected to be higher than a first preset value, the fifth electric valve is controlled to be closed, so that cooling water of the second cooling tower enters the condenser through the third circulating water pump;
when the temperature of the water entering the first water inlet of the water-water heat exchanger is detected to be higher than a second preset value, the first electric valve is controlled to be closed, the second electric valve is controlled to be opened, the third electric valve is controlled to be opened, and the fourth electric valve is controlled to be closed, so that cold water of the tail end air conditioner is introduced into the evaporator for cooling.
Preferably, the step of controlling the fifth electric valve to close further comprises, when the condenser water inlet temperature is detected to be higher than a first preset value:
when the difference between the detected outlet water temperature of the tail end air conditioner and the detected cold water temperature of the communication pipeline is smaller than a fourth preset value, the first electric valve is controlled to be closed, the second electric valve is controlled to be opened, the third electric valve is controlled to be opened, and the fourth electric valve is controlled to be closed, so that cold water of the tail end air conditioner is introduced into the evaporator for cooling.
Preferably, the step of controlling the first electrically operated valve to be closed, the second electrically operated valve to be opened, the third electrically operated valve to be opened, and the fourth electrically operated valve to be closed includes:
And controlling the first circulating water pump and the first cooling tower to be closed.
In the technical scheme of the invention, the central air conditioning system energy efficiency lifting assembly comprises a cooling water circulation system, a water chilling unit energy efficiency lifting device and a cooling circulation system which are sequentially connected through pipelines; the cooling water circulation system comprises a first cooling tower, a first circulating water pump, a first water outlet pipe and a first water return pipe, wherein the first water outlet pipe and the first water return pipe are communicated with the first cooling tower; the water chiller energy efficiency lifting device comprises a water-water heat exchanger and an evaporator, wherein the water-water heat exchanger is provided with a first water inlet, a first water outlet, a second water inlet and a second water outlet, the evaporator is provided with a third water inlet and a third water outlet, the first water outlet pipe is communicated with the first water inlet through a first circulating water pump, the first water return pipe is communicated with the first water outlet, and the second water outlet is communicated with the third water inlet through a communication pipeline; the cooling circulation system comprises a tail end air conditioner, a second circulating water pump, a second water outlet pipe and a second water return pipe, wherein the second water outlet pipe and the second water return pipe are communicated with the tail end air conditioner, the second water outlet pipe is communicated with the second water inlet through the second circulating water pump, and the second water return pipe is communicated with the third water outlet. This put case is through first outlet pipe, first wet return is with first cooling tower and water heat exchanger intercommunication, the second outlet pipe is with terminal air conditioner and water heat exchanger connection, the second wet return is with terminal air conditioner and evaporator connection, the communication pipeline is with water heat exchanger and evaporator connection, realize when the cold water cooling of terminal air conditioner is insufficient to the evaporimeter, carry out the one-level cooling to terminal air conditioner through the cooling water of first cooling tower after, the rethread evaporimeter carries out the second grade cooling, thereby when outdoor temperature is lower, the natural cold source cooling of make full use of first cooling tower supplies cold, the load of evaporimeter has been reduced, the energy efficiency of cooling water set has been promoted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram illustrating an assembly structure of an energy efficiency enhancing assembly of a central air conditioning system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a control method of an energy efficiency enhancing component of a central air conditioning system according to a first embodiment of the present invention;
FIG. 3 is a flow chart of a control method of an energy efficiency enhancing assembly of a central air conditioning system according to a second embodiment of the present invention;
FIG. 4 is a flow chart of a third embodiment of a control method of an energy efficiency enhancing assembly of a central air conditioning system according to the present invention;
FIG. 5 is a flow chart of a fourth embodiment of a control method of an energy efficiency enhancing assembly of a central air conditioning system according to the present invention;
fig. 6 is a flowchart of a control method of an energy efficiency enhancing component of a central air conditioning system according to a fifth embodiment of the present invention.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
The invention provides an energy efficiency lifting assembly of a central air conditioning system.
Referring to fig. 1, in the embodiment of the present invention, the central air conditioning system energy efficiency enhancing assembly is characterized by comprising a cooling water circulation system 100, a chiller energy efficiency enhancing device 200 and a cooling circulation system 300, which are sequentially connected through pipes; the cooling water circulation system 100 includes a first cooling tower 110, a first circulating water pump 120, and a first water outlet pipe 130 and a first water return pipe 140 communicating with the first cooling tower 100; the water chiller energy efficiency lifting device 200 comprises a water-water heat exchanger 210 and an evaporator 220, wherein the water-water heat exchanger 210 is provided with a first water inlet 211, a first water outlet 212, a second water inlet 214 and a second water outlet 213, the evaporator 220 is provided with a third water inlet 221 and a third water outlet 222, the first water outlet pipe 130 is communicated with the first water inlet 211 through a first circulating water pump 120, the first water return pipe 140 is communicated with the first water outlet 212, and the second water outlet 213 is communicated with the third water inlet 221 through a communication pipeline; the cooling circulation system 300 includes a terminal air conditioner 310, a second circulating water pump 320, and a second water outlet pipe 330 and a second water return pipe 340 which are connected to the terminal air conditioner 310, wherein the second water outlet pipe 330 is connected to the second water inlet 214 via the second circulating water pump 320, and the second water return pipe 340 is connected to the third water outlet 222.
The central air conditioning system energy efficiency improving assembly of the invention consists of a cooling water circulation system 100, a water chilling unit energy efficiency improving device 200 and a cooling circulation system 300, wherein the cooling water circulation system 100 comprises a first cooling tower 110, the water chilling unit energy efficiency improving device 200 comprises a water-water heat exchanger 210 and an evaporator 220, and the cooling circulation system 300 comprises a tail end air conditioner 310. The first cooling tower 110 is communicated with the first water inlet 211 and the first water outlet 212 on the water-water heat exchanger 210 through the first water outlet pipe 130 and the first water return pipe 140, and the first water outlet 130 is provided with the first circulating water pump 120 so as to convey the cooling water in the first cooling tower 110 to the water-water heat exchanger 210 through the first water outlet pipe 130 and return the cooling water to the first cooling tower 110 through the first water return pipe 140, thereby realizing the circulation of the cooling water between the first cooling tower 110 and the water-water heat exchanger 210. The end air conditioner 310 is communicated with the second water inlet 214 on the water-water heat exchanger 210 through the second water outlet pipe 330, is communicated with the third water outlet 222 on the evaporator 220 through the second water return pipe 340, and is simultaneously communicated with the third water inlet 221 on the evaporator 220 through a communication pipeline, the second water outlet pipe 330 is provided with the second circulating water pump 320, so that cold water in the end air conditioner 310 is conveyed to the water-water heat exchanger 210 through the second water outlet pipe 330, is conveyed to the evaporator 220 through the communication pipeline, and finally returns to the end air conditioner 310 through the second water return pipe 340, and circulation of the cold water among the end air conditioner 310, the water-water heat exchanger 210 and the evaporator 220 is realized. When the cold water of the end air conditioner 310 runs to the water-water heat exchanger 210, the cooling water conveyed from the cooling tower to the water-water heat exchanger 210 exchanges heat with the cold water, the cold water from the end air conditioner 310 is subjected to primary cooling treatment, the cold water after the primary cooling treatment continues to run to the evaporator 220, the evaporator 220 further performs secondary cooling on the cold water, the cold water after the secondary cooling treatment is conveyed back to the end air conditioner 310 to cool the environment where the end air conditioner 310 is located, and therefore the natural cold source cooling and cooling of the first cooling tower 110 are fully utilized, the load of the evaporator 220 is reduced, and the energy efficiency of a water chiller is improved.
In a further technical solution, the second water outlet pipe 330 is provided with a first electric valve 1 and a second electric valve 2, the first end of the first electric valve 1 and the first end of the second electric valve 2 are connected in parallel to the second water outlet pipe 330, the second end of the first electric valve 1 is communicated with the second water inlet 214, and the second end of the second electric valve 2 is connected to a communication pipeline; the second return pipe 340 is provided with a third electric valve 3 and a fourth electric valve 4, the first end of the third electric valve 3 and the first end of the fourth electric valve 4 are connected in parallel to the second return pipe 340, the second end of the third electric valve 3 is communicated with the third water outlet 222, and the second end of the fourth electric valve 4 is connected to a communication pipeline.
Further, the second water outlet pipe 330 of the present technical solution is provided with the first electric valve 1 and the second electric valve 2, and the first ends of the first electric valve 1 and the second electric valve 2 are both connected in parallel to the second water outlet pipe 330, the second end of the first electric valve 1 is connected to the second water inlet 214 of the water-water heat exchanger 210, and the second end of the second electric valve 2 is connected to the communicating pipe, so as to realize that the cold water conveyed from the terminal air conditioner 310 via the second water outlet pipe 330 can reach the water-water heat exchanger 210 via the first electric valve 1 to perform primary cooling, or can be directly conveyed from the second electric valve 2 to the evaporator 220 without passing through the water-water heat exchanger 210 to perform secondary cooling. The corresponding second return pipe 340 is provided with a third electric valve 3 and a fourth electric valve 4, the first ends of the third electric valve 3 and the fourth electric valve 4 are connected in parallel to the second return pipe 340, the second end of the third electric valve 3 is communicated with the third water outlet 222 of the evaporator 220, and the second end of the fourth electric valve 4 is communicated with a communicating pipe, so that cold water conveyed from the water-water heat exchanger 210 is returned to the terminal air conditioner 310 through the third electric valve 3 after being subjected to secondary cooling by the evaporator 220, or is returned to the terminal controller from the fourth electric valve 4 without being subjected to secondary cooling by the evaporator 220, or cold water conveyed from the terminal air conditioner 310 through the second water outlet pipe 330 is returned to the terminal controller from the third electric valve 3 after being subjected to secondary cooling by the second electric valve 2. According to the scheme, according to different cooling requirements, the first electric valve 1, the second electric valve 2, the third electric valve 3 and the fourth electric valve 4 are matched to be opened and closed, different cold water running passages are realized, and the use requirements of different environments can be met.
In a further technical solution, the cooling water circulation system 100 further includes a second cooling tower 160, a third circulating water pump 150, and a third water outlet pipe 170 and a third water return pipe 180 which are communicated with the second cooling tower 160, wherein a fifth electric valve 8 is disposed between the third water outlet pipe 170 and the third water return pipe 180, wherein a first end of the fifth electric valve 8 is communicated with the third water outlet pipe 170, and a second end of the fifth electric valve 8 is communicated with the third water return pipe 180; the water chiller energy efficiency lifting device 200 further comprises a condenser 230, a fourth water inlet 231 and a fourth water outlet 232 are arranged on the condenser 230, the fourth water inlet 231 is connected with the first end of the fifth electric valve 8 through the third circulating water pump 150, and the fourth water outlet 232 is connected with the second end of the fifth electromagnetic valve.
Still further, the cooling water circulation system 100 further includes a second cooling tower 160 and a third circulating water pump 150, the chiller energy efficiency improving device 200 further includes a condenser 230, the second cooling tower 160 is communicated with a fourth water inlet 231 and a fourth water outlet 232 on the condenser 230 through a third water outlet pipe 170, a third water return pipe 180, and the third circulating water pump 150 is disposed on the third water outlet pipe 170, so that cooling water of the second cooling tower 160 is conveyed to the condenser 230 through the third water outlet pipe 170, and then conveyed back to the second cooling tower 160 through the third water return pipe 180, thereby forming a circulation between the second cooling tower 160 and the condenser 230. Meanwhile, the chiller energy efficiency lifting device 200 further comprises a compressor 240 and a throttling mechanism 250, wherein the first ends of the compressor 240 and the throttling mechanism 250 are connected to the condenser 230, and the second ends of the compressor 240 and the throttling mechanism 250 are connected to the evaporator 220, so that the reverse Carnot cycle of the compressor 240, the evaporator 220, the throttling mechanism 250 and the condenser 230 is formed. The cooling water of the second cooling tower 160 is used for cooling the condenser 230, and when the external temperature is low, the temperature of the cooling water of the second cooling tower 160 is correspondingly low, so that the temperature of the condenser 230 is greatly reduced, and the water chiller is stopped for protection. In order to prevent the cold water unit from being subjected to low-temperature shutdown protection, the fifth electric valve 8 is arranged between the third water outlet pipe 170 and the third water return pipe 180, so that when the temperature of the inlet water of the third water outlet pipe 170 is lower, namely the temperature of the cooling water entering the condenser 230 from the second cooling tower 160 is lower, the fifth electric valve 8 is opened, the cooling water passing through the third water return pipe 180 from the condenser 230 is divided into two parts, the first part directly returns to the second cooling tower 160, the second part directly flows through the condenser 230 from the fifth electric valve 8 through the third water outlet pipe 170 again, and the cooling water of the second part directly flows back to the condenser 230 without passing through the second cooling tower 160, so that the temperature of the condenser 230 is prevented from being lowered greatly, and the cold water unit shutdown protection is avoided.
Preferably, the central air conditioning system energy efficiency improving assembly further comprises a first temperature sensor 10 arranged on the first water outlet pipe 130, a second temperature sensor 9 arranged on the third water outlet pipe 170, a third temperature sensor 7 arranged on the communication pipeline, a fourth temperature sensor 5 arranged on the second water outlet pipe 330 and a fifth temperature sensor 6 arranged on the second water return pipe 340; the central air conditioning system energy efficiency lifting assembly further comprises a first controller 13 and a second controller 12, wherein the first temperature sensor 10, the third temperature sensor 7, the fourth temperature sensor 5, the fifth temperature sensor 6, the first electric valve 1, the second electric valve 2, the third electric valve 3 and the fourth electric valve 4 are all connected with the first controller 13; the second controller 12 is connected to the second temperature sensor 9 and the fifth electrically operated valve 8 to control the opening or closing of the fifth electrically operated valve 8 according to the temperature detected by the second temperature sensor 9.
In this technical solution, the central air conditioning system energy efficiency enhancing component further includes a first temperature sensor 10 for detecting a water inlet temperature of the first water inlet 211 of the water-water heat exchanger 210, a second temperature sensor 9 for detecting a water inlet temperature of the condenser 230, a third temperature sensor 7 for detecting a cold water temperature of the communication pipeline, a fourth temperature sensor 5 for detecting a water outlet temperature of the terminal air conditioner 310, and a fifth temperature sensor 6 for detecting a water return temperature of the terminal air conditioner 310; in addition, the energy efficiency lifting assembly of the central air conditioning system further comprises a first controller 13 and a second controller 12, wherein the first temperature sensor 10, the third temperature sensor 7, the fourth temperature sensor 5, the fifth temperature sensor 6, the first electric valve 1, the second electric valve 2, the third electric valve 3 and the fourth electric valve 4 are all connected with the first controller 13, so that the first controller 13 controls the corresponding electric valves to be opened or closed according to the temperatures of different positions detected by different temperature sensors, and water circulation of different loops is formed, and the use requirements of different environments are met; the second controller 12 is connected with the second temperature sensor 9 and the fifth electric valve 8 to control the opening or closing of the fifth electric valve 8 according to the temperature detected by the second temperature sensor 9, so that part or all of water coming back from the condenser 230 returns to the second cooling tower 160, heat dissipation of the cooling tower according to the external environment is realized, the condenser 230 is prevented from being cooled greatly, and the shutdown protection of the chiller is avoided.
Preferably, the central air conditioning system energy efficiency improving assembly further comprises an outdoor temperature and humidity sensor 11 respectively connected with the first controller 13 and the second controller 12, the first controller 13 calculates an outdoor wet bulb temperature according to the outdoor temperature and the outdoor relative humidity detected by the outdoor temperature and humidity sensor 11, and the second controller 12 controls the first circulating water pump 120 to be turned on or turned off according to the outdoor wet bulb temperature.
In a further technical scheme, the central air conditioning system energy efficiency improving organization further comprises a controller for detecting the temperature and relative humidity of the outdoor environment, wherein the first controller 13 is connected with the outdoor temperature and humidity sensor 11 to calculate the outdoor wet bulb temperature according to the detected outdoor temperature and outdoor relative humidity; meanwhile, the second controller 12 is also connected to the outdoor temperature and humidity sensor 11 to control the on or off of the first circulating water pump 120 according to the outdoor wet bulb temperature. Since the lower the wet bulb temperature is, the greater the water inlet and outlet temperature difference of the second cooling tower 160 is, when the outdoor wet bulb temperature is detected to be lower than a certain preset value, it means that the return water temperature is higher than the water outlet temperature and the water inlet and outlet temperature difference is larger after the cooling water from the second cooling tower 160 is returned to the second cooling tower 160 by the heat exchange of the water-to-water heat exchanger 210. That is, the temperature of the cold water from the end air conditioner 310 to the water-water heat exchanger 210 is high, and the first circulating water pump 120 needs to be turned on to circulate the first cooling tower 110 and the water-water heat exchanger 210, so as to cool the cold water of the end air conditioner 310.
The present invention also provides a control method based on the energy efficiency lifting assembly of the central air conditioning system according to any one of the above, wherein the air conditioning outlet water pipe is provided with a first electric valve 1 and a second electric valve 2, the second return water pipe 340 is provided with a third electric valve 3 and a fourth electric valve 4, the water chiller energy efficiency lifting device 200 further comprises a condenser 230, and referring to fig. 2, in one embodiment, the control method of the energy efficiency lifting assembly of the central air conditioning system provided by the present invention comprises the following steps:
step S10, detecting the outdoor temperature and the outdoor relative humidity, and calculating the wet bulb temperature according to the outdoor temperature and the outdoor relative humidity;
the central air conditioning system energy efficiency lifting assembly utilizes the natural cold source to lift the energy efficiency of the water chilling unit. Specifically, the wet bulb temperature is calculated according to the detected outdoor temperature and the detected outdoor relative humidity, and is used as one of judging conditions for whether a natural cold source is introduced for cooling. The outdoor temperature and the outdoor relative humidity may be detected by an outdoor temperature and humidity sensor 11, and the wet bulb temperature is calculated according to the outdoor temperature and the outdoor relative humidity detected by the outdoor temperature and humidity, where the wet bulb temperature represents the lowest temperature reached by water through evaporation at a certain place for a certain time. The lowest temperature to which water may be cooled in the second cooling tower 160, i.e., the lowest limit value of the outlet water temperature of the second cooling tower 160, is the lowest for the present invention, so that the natural cooling source effect for cooling is better when the wet bulb temperature value is lower.
Step S20, when it is detected that the inlet water temperature of the condenser 230 is lower than the first preset value and the wet bulb temperature is lower than the preset wet bulb temperature value, controlling the first circulating water pump 120 to be turned on to introduce the cooling water of the first cooling tower 110 into the water-water heat exchanger 210 to cool the cold water of the terminal air conditioner 310;
further, the present invention further needs to detect the water inlet temperature of the condenser 230, specifically, a temperature sensor is used for detection, and a first preset value is set as a comparison of the water inlet temperature, when the water inlet temperature is higher than the first preset value, it indicates that the external environment temperature is higher, the corresponding temperature of the cooling water is also higher, and the cooling water is used for cooling the condenser 230, so that the normal operation of the chiller cannot be affected; when the temperature of the incoming water is lower than the first preset value, it indicates that the temperature of the external environment is low, and the temperature of the cooling water is also low, so that the cooling water machine set may be shut down for protection when the cooling water is used for radiating the condenser 230. Therefore, when the water inlet temperature of the condenser 230 is lower than the first preset value, which may cause the water chiller to fail to work normally, and the wet bulb temperature is lower than the preset wet bulb temperature, the natural cold source is used to cool the cold water of the terminal air conditioner 310, the first circulating water pump 120 is controlled to be turned on, so that the cooling water of the first cooling tower 110 is introduced into the water-water heat exchanger 210 as the natural cold source to cool the cold water.
In step S30, when it is detected that the inlet water temperature of the first inlet 211 of the water-water heat exchanger 210 is lower than the second preset value, the first electric valve 1 is controlled to be opened, the second electric valve 2 is controlled to be closed, the third electric valve 3 is controlled to be opened, and the fourth electric valve 4 is controlled to be closed, so that cold water of the terminal air conditioner is introduced into the water-water heat exchanger 210, and after the first cooling water is cooled by the cooling water of the first cooling tower 110, the second cooling water is cooled by the evaporator 220.
Further, the first water inlet 211 of the water-water heat exchanger 210 is communicated with the first water outlet 130 of the first cooling tower 110, the water inlet is the water outlet of the first cooling tower 110, and the second preset value is a preset temperature value for judging whether the temperature of the water inlet can be used for heat exchange and cooling. When the temperature of the incoming water is detected to be lower than the second preset value, the incoming water temperature is low enough to be used for heat exchange and cooling of the water-water heat exchanger 210, and at the moment, the first electric valve 1 is controlled to be opened, the second electric valve 2 is closed, the third electric valve 3 is opened, and the fourth electric valve 4 is controlled to be closed, so that cold water of the end air conditioner 310 is introduced into the water-water heat exchanger 210 through the first electric valve 1, and cooling water of the end air conditioner 310 is cooled in the water-water heat exchanger 210 by using cooling water of the first cooling tower 110.
In the technical solution of this embodiment, when the calculated wet bulb temperature according to the detected outdoor temperature and the detected outdoor relative humidity is lower than the preset wet bulb temperature value, it indicates that the difference between the water inlet and outlet temperatures of the second cooling tower 160 as the natural cooling source is large, that is, the water return temperature is higher than the water outlet temperature, and the water return temperature can be used as the natural cooling source to cool the cold water of the terminal air conditioner 310. Meanwhile, when the detected water inlet temperature of the condenser 230 is lower than the first preset temperature value, it indicates that the external temperature is lower, and the temperature of the cooling water for cooling the condenser 230 is lower, so that the temperature of the condenser 230 is lower and higher, resulting in shutdown protection of the chiller, and the terminal air conditioner 310 cannot effectively cool. At this time, the first circulating water pump 120 is controlled to be turned on, and the cooling water of the first cooling tower 110 is introduced into the water-water heat exchanger 210, so as to form cooling water circulation of the first cooling tower and the water-water heat exchanger 210; in addition, the first electric valve 1 is controlled to be opened, the second electric valve 2 is controlled to be closed, the third electric valve 3 is controlled to be opened, and the fourth electric valve 4 is controlled to be closed, so that cold water of the end air conditioner 310 is introduced into the water-water heat exchanger 210 through the first electric valve 1, flows into the evaporator 220 through the communicating pipe through the water-water heat exchanger 210, flows back to the end air conditioner 310 through the third electric valve 3 in the evaporator 220, and forms cold water circulation among the end air conditioner 310, the water-water heat exchanger 210 and the evaporator 220. When the cold water of the end air conditioner 310 runs to the water-water heat exchanger 210, the cooling water conveyed from the cooling tower to the water-water heat exchanger 210 exchanges heat with the cold water, the cold water from the end air conditioner 310 is subjected to primary cooling treatment, the cold water after the primary cooling treatment continues to run to the evaporator 220, the evaporator 220 further performs secondary cooling on the cold water, the cold water after the secondary cooling treatment is conveyed back to the end air conditioner 310 to cool the environment where the end air conditioner 310 is located, and therefore the natural cold source cooling and cooling of the first cooling tower 110 are fully utilized, the load of the evaporator 220 is reduced, and the energy efficiency of a water chiller is improved.
Further, referring to fig. 3, in a first embodiment of the control method for the central air conditioning system energy efficiency enhancing component according to the present invention, in a second embodiment of the control method for the central air conditioning system energy efficiency enhancing component according to the present invention, when it is detected that the inlet water temperature of the condenser 230 is lower than a first preset value and the wet bulb temperature is lower than a preset wet bulb temperature value, the step of controlling the first circulating water pump 120 to be turned on further includes:
in step S40, when the difference between the detected cold water temperature of the communication pipeline and the detected return water temperature of the terminal air conditioner 310 is smaller than the third preset value within the preset time period, and the wet bulb temperature is lower than the preset wet bulb temperature value, the first electric valve 1 is controlled to be opened, the second electric valve 2 is controlled to be closed, the third electric valve 3 is controlled to be closed, and the fourth electric valve 4 is controlled to be closed, so that the cold water of the terminal air conditioner 310 is introduced into the water-water heat exchanger 210, and the first-stage cooling is performed through the cooling water of the first cooling tower 110.
In another embodiment of the present invention, since the cold water temperature of the communication pipe is the cold water temperature after the heat exchange and the cooling of the water-water heat exchanger 210, the return water temperature of the end air conditioner 310 is the cold water temperature after the cooling and the cooling of the end air conditioner 310, and is used for cooling the environment where the end air conditioner 310 is located, when the difference between the cold water temperature of the communication pipe and the return water temperature of the end air conditioner 310 is smaller than the third preset value within the continuous preset time, the difference between the two is smaller, and the requirement of the return water temperature of the end air conditioner 310 can be met after the heat exchange and the cooling of the water-water heat exchanger 210. The preset duration is used for judging the stability of heat exchange of the water-water heat exchanger 210, and in a certain preset duration, the difference value of the preset duration and the preset duration is smaller than a third preset value, which indicates that the heat exchange of the water-water heat exchanger 210 is stable, so that the cooling of the water-water heat exchanger 210 by the end air conditioner 310 can be realized by controlling the first electric valve 1 to be opened, the second electric valve 2 to be closed, the third electric valve 3 to be closed and the fourth electric valve 4 to be closed, the cooling of the environment where the end air conditioner 310 is located can be realized by performing primary cooling by the cooling water of the first cooling tower 110, the secondary cooling of the evaporator 220 is not needed, the load of the evaporator 220 is further reduced, and the energy efficiency of a water chilling unit is improved.
Further, referring to fig. 4, in a third embodiment of the control method for the central air conditioning system energy efficiency enhancing assembly according to the second embodiment of the present invention, the cooling water circulation system 100 further includes a second cooling tower 160, a third circulating water pump 150, and a fifth electric valve 8, and the control method for the central air conditioning system energy efficiency enhancing assembly further includes the steps of:
step S50, when the temperature of the inlet water of the condenser 230 is detected to be higher than a first preset value, the fifth electric valve 8 is controlled to be closed, so that the cooling water of the second cooling tower 160 enters the condenser 230 through the third circulating water pump 150;
in step S60, when it is detected that the inlet water temperature of the first inlet 211 of the water-water heat exchanger 210 is higher than the second preset value, the first electric valve 1 is controlled to be closed, the second electric valve 2 is opened, the third electric valve 3 is opened, and the fourth electric valve 4 is controlled to be closed, so as to introduce the cold water of the end air conditioner 310 into the evaporator 220 for cooling.
Further, when the temperature of the inlet water of the condenser 230 is detected to be higher than the first preset value, it indicates that the temperature of the external environment is higher, and the temperature of the corresponding cooling water is also higher, so that the cooling water used for cooling the condenser 230 will not affect the normal operation of the chiller, and at this time, the fifth electric valve 8 is closed, so that the cooling water of the low-temperature cooling tower enters the condenser 230 through the third circulating water pump 150 to dissipate the heat of the condenser 230. Meanwhile, when the inlet water temperature of the first inlet 211 of the water-water heat exchanger 210 is detected to be higher than the second preset value, it indicates that the inlet water temperature of the water-water heat exchanger 210 is not low enough, and the inlet water temperature is not used for heat exchange and cooling of the water-water heat exchanger 210, in this case, the end air conditioner 310 is cooled by using the reverse carnot cycle formed by the compressor 240, the evaporator 220, the throttling mechanism 250 and the condenser 230. The first electric valve 1 is controlled to be closed, the second electric valve 2 is controlled to be opened, the third electric valve 3 is controlled to be opened, and the fourth electric valve 4 is controlled to be closed, so that the circulation of the tail end air conditioner 310 to the evaporator 220 through the second electric valve 2 and then to the tail end air conditioner 310 through the third electric valve 3 is formed, cold water of the tail end air conditioner 310 is introduced into the evaporator 220, the compressor 240 compresses and conveys the refrigerant to the evaporator 220, the refrigerant evaporates and absorbs heat in the evaporator 220, and the cold water of the tail end air conditioner 310 is cooled.
Further, referring to fig. 5, in a third embodiment of the control method for an energy efficiency enhancing component of a central air conditioning system according to the present invention, in a fourth embodiment of the control method for an energy efficiency enhancing component of a central air conditioning system according to the present invention, when it is detected that the temperature of the inlet water of the condenser 230 is higher than a first preset value, the step of controlling the fifth electrically operated valve 8 to be closed further includes:
in step S70, when the difference between the detected outlet water temperature of the end air conditioner 310 and the detected cold water temperature of the communication pipeline is smaller than the fourth preset value, the first electric valve 1 is controlled to be closed, the second electric valve 2 is opened, the third electric valve 3 is opened, and the fourth electric valve 4 is controlled to be closed, so that the cold water of the end air conditioner 310 is introduced into the evaporator 220 for cooling.
Still further, in another embodiment of the present invention, the outlet water temperature of the end air conditioner 310 is the cold water temperature required to be cooled, and the cold water temperature of the communication pipeline is the temperature after being cooled by heat exchange of the water-water heat exchanger 210. When the difference between the outlet water temperature of the end air conditioner 310 and the cold water temperature of the communication pipeline is smaller than the fourth preset value, it is indicated that the temperature does not change greatly after the temperature is reduced by the water-water heat exchanger 210, that is, the temperature reducing effect of the water-water heat exchanger 210 is not obvious, and at this time, the end air conditioner 310 is reduced by adopting the reverse carnot cycle formed by the compressor 240, the evaporator 220, the throttling mechanism 250 and the condenser 230. The first electric valve 1 is controlled to be closed, the second electric valve 2 is controlled to be opened, the third electric valve 3 is controlled to be opened, and the fourth electric valve 4 is controlled to be closed, so that the circulation of the tail end air conditioner 310 to the evaporator 220 through the second electric valve 2 and then to the tail end air conditioner 310 through the third electric valve 3 is formed, cold water of the tail end air conditioner 310 is introduced into the evaporator 220, the compressor 240 compresses and conveys the refrigerant to the evaporator 220, the refrigerant evaporates and absorbs heat in the evaporator 220, and the cold water of the tail end air conditioner 310 is cooled.
Further, referring to fig. 6, in a fourth embodiment of the control method for an energy efficiency enhancing component of a central air conditioning system according to the present invention, after the steps of controlling the first electric valve 1 to be closed, the second electric valve 2 to be opened, the third electric valve 3 to be opened, and the fourth electric valve 4 to be closed, the method includes:
in step S80, the first circulating water pump 120 and the first cooling tower 110 are controlled to be turned off.
Further, when the temperature of the end air conditioner 310 does not change greatly after the water heat exchanger 210 is cooled, the end air conditioner 310 is cooled by the reverse carnot cycle formed by the compressor 240, the evaporator 220, the throttling mechanism 250 and the condenser 230, and the water heat exchanger 210 does not work. The first cooling tower 110 supporting the operation of the water-water heat exchanger 210 and the first circulating water pump 120 are thus turned off to further reduce power consumption.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the specification and drawings of the present invention or direct/indirect application in other related technical fields are included in the scope of the present invention.

Claims (8)

1. The energy efficiency lifting assembly of the central air conditioning system is characterized by comprising a cooling water circulation system (100), a water chilling unit energy efficiency lifting device (200) and a cooling circulation system (300) which are sequentially connected through pipelines;
the cooling water circulation system (100) comprises a first cooling tower (110), a first circulating water pump (120), and a first water outlet pipe (130) and a first water return pipe (140) which are communicated with the first cooling tower (100);
the water chiller energy efficiency lifting device (200) comprises a water-water heat exchanger (210) and an evaporator (220), wherein a first water inlet (211), a first water outlet (212), a second water inlet (214) and a second water outlet (213) are arranged on the water-water heat exchanger (210), a third water inlet (221) and a third water outlet (222) are arranged on the evaporator (220), a first water outlet pipe (130) is communicated with the first water inlet (211) through a first circulating water pump (120), a first water return pipe (140) is communicated with the first water outlet (212), and a second water outlet (213) is communicated with the third water inlet (221) through a communication pipeline;
the cooling circulation system (300) comprises a tail end air conditioner (310), a second circulating water pump (320), and a second water outlet pipe (330) and a second water return pipe (340) which are communicated with the tail end air conditioner (310), wherein the second water outlet pipe (330) is communicated with the second water inlet (214) through the second circulating water pump (320), and the second water return pipe (340) is communicated with the third water outlet (222);
The cooling water circulation system (100) further comprises a second cooling tower (160), a third circulating water pump (150), a third water outlet pipe (170) and a third water return pipe (180), wherein the third water outlet pipe (170) and the third water return pipe (180) are communicated with the second cooling tower (160), a fifth electric valve (8) is arranged between the third water outlet pipe (170) and the third water return pipe (180), a first end of the fifth electric valve (8) is communicated with the third water outlet pipe (170), and a second end of the fifth electric valve (8) is communicated with the third water return pipe (180);
the water chilling unit energy efficiency lifting device (200) further comprises a condenser (230), a fourth water inlet (231) and a fourth water outlet (232) are arranged on the condenser (230), the fourth water inlet (231) is connected with the first end of the fifth electric valve (8) through the third circulating water pump (150), and the fourth water outlet (232) is connected with the second end of the fifth electromagnetic valve (8);
the central air conditioning system energy efficiency lifting assembly further comprises a first temperature sensor (10) arranged on the first water outlet pipe (130), a second temperature sensor (9) arranged on the third water outlet pipe (170), a third temperature sensor (7) arranged on the communication pipeline, a fourth temperature sensor (5) arranged on the second water outlet pipe (330) and a fifth temperature sensor (6) arranged on the second water return pipe;
The central air conditioning system energy efficiency lifting assembly further comprises a first controller (13) and a second controller (12), wherein the first temperature sensor (10), the third temperature sensor (9), the fourth temperature sensor (5), the fifth temperature sensor (6), the first electric valve (1), the second electric valve (2), the third electric valve (3) and the fourth electric valve (4) are all connected with the first controller (13); the second controller (12) is connected with the second temperature sensor (9) and the fifth electric valve (8) to control the opening or closing of the fifth electric valve (8) according to the temperature detected by the second temperature sensor (9).
2. The central air conditioning system energy efficiency lifting assembly according to claim 1, wherein a first electric valve (1) and a second electric valve (2) are arranged on the second water outlet pipe (330), a first end of the first electric valve (1) and a first end of the second electric valve (2) are connected in parallel on the second water outlet pipe (330), a second end of the first electric valve (1) is communicated with the second water inlet (214), and a second end of the second electric valve (2) is connected to a communication pipeline;
the second return pipe (340) is provided with a third electric valve (3) and a fourth electric valve (4), the first end of the third electric valve (3) and the first end of the fourth electric valve (4) are connected in parallel on the second return pipe, the second end of the third electric valve (3) is communicated with the third water outlet (222), and the second end of the fourth electric valve (4) is connected to a communication pipeline.
3. The central air conditioning system energy efficiency improving assembly according to claim 1, further comprising an outdoor temperature and humidity sensor (11) connected to the first controller (13) and the second controller (12), respectively, wherein the first controller (13) calculates an outdoor wet bulb temperature according to an outdoor temperature and an outdoor relative humidity detected by the outdoor temperature and humidity sensor (11), and the second controller (12) controls the first circulating water pump (120) to be turned on or off according to the outdoor wet bulb temperature.
4. A control method based on the central air conditioning system energy efficiency lifting assembly of any one of claims 1 to 3, characterized in that the second water outlet pipe is provided with a first electric valve and a second electric valve, the second water return pipe is provided with a third electric valve and a fourth electric valve, the water chiller energy efficiency lifting device further comprises a condenser, and the control method of the central air conditioning system energy efficiency lifting assembly comprises the following steps:
detecting the outdoor temperature and the outdoor relative humidity, and calculating the wet bulb temperature according to the outdoor temperature and the outdoor relative humidity;
when the inlet water temperature of the condenser is detected to be lower than a first preset value and the wet bulb temperature is detected to be lower than the preset wet bulb temperature value, the first circulating water pump is controlled to be started so as to introduce cooling water of the first cooling tower into the water-water heat exchanger to cool cold water of the tail-end air conditioner;
When the inlet water temperature of the first water inlet of the water-water heat exchanger is detected to be lower than a second preset value, the first electric valve is controlled to be opened, the second electric valve is controlled to be closed, the third electric valve is controlled to be opened, and the fourth electric valve is controlled to be closed, so that cold water of the tail end air conditioner is introduced into the water-water heat exchanger, and cooling water of the first cooling tower is subjected to primary cooling and then subjected to secondary cooling through the evaporator.
5. The method for controlling an energy efficiency enhancing component of a central air conditioning system as set forth in claim 4, wherein the step of controlling the first circulating water pump to be turned on further includes, when the condenser intake water temperature is detected to be lower than a first preset value and the wet bulb temperature is detected to be lower than a preset wet bulb temperature value:
when the difference value between the detected cold water temperature of the communication pipeline and the detected return water temperature of the tail end air conditioner is smaller than a third preset value within a preset time period, and the wet bulb temperature is lower than the preset wet bulb temperature value, the first electric valve is controlled to be opened, the second electric valve is controlled to be closed, the third electric valve is controlled to be closed, and the fourth electric valve is controlled to be closed, so that cold water of the tail end air conditioner is introduced into the water-water heat exchanger, and the first-stage cooling is performed through the cooling water of the first cooling tower.
6. The method of controlling an energy efficiency enhancing assembly of a central air conditioning system as claimed in claim 4, wherein the cooling water circulation system further comprises a second cooling tower, a third circulation water pump and a fifth electric valve, the method of controlling an energy efficiency enhancing assembly of a central air conditioning system further comprising the steps of:
When the inlet water temperature of the condenser is detected to be higher than a first preset value, the fifth electric valve is controlled to be closed, so that cooling water of the second cooling tower enters the condenser through the third circulating water pump;
when the temperature of the water entering the first water inlet of the water-water heat exchanger is detected to be higher than a second preset value, the first electric valve is controlled to be closed, the second electric valve is controlled to be opened, the third electric valve is controlled to be opened, and the fourth electric valve is controlled to be closed, so that cold water of the tail end air conditioner is introduced into the evaporator for cooling.
7. The method of claim 6, wherein the step of controlling the fifth electric valve to be closed further comprises, when the temperature of the inlet water of the condenser is detected to be higher than a first preset value:
when the difference between the detected outlet water temperature of the tail end air conditioner and the detected cold water temperature of the communication pipeline is smaller than a fourth preset value, the first electric valve is controlled to be closed, the second electric valve is controlled to be opened, the third electric valve is controlled to be opened, and the fourth electric valve is controlled to be closed, so that cold water of the tail end air conditioner is introduced into the evaporator for cooling.
8. The method of claim 7, wherein the step of controlling the first electrically operated valve to be closed, the second electrically operated valve to be opened, the third electrically operated valve to be opened, and the fourth electrically operated valve to be closed comprises:
And controlling the first circulating water pump and the first cooling tower to be closed.
CN201710144546.8A 2017-03-10 2017-03-10 Central air conditioning system energy efficiency lifting assembly and control method thereof Active CN106839218B (en)

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CN107327993B (en) * 2017-07-07 2020-04-21 深圳达实智能股份有限公司 Refrigerating system and refrigerating method thereof
CN111156627A (en) * 2020-01-17 2020-05-15 广东申菱环境***股份有限公司 Efficient evaporative cooling type water chilling unit and control method thereof
CN111988962A (en) * 2020-08-20 2020-11-24 武汉众维亿方大数据科技有限公司 Heat exchange device and heat exchange method for exchanging heat for cabinet air conditioner
CN117440670B (en) * 2023-12-21 2024-03-29 常州博瑞电力自动化设备有限公司 External cooling system and control method thereof

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