CN112378054B - Intelligent energy-saving central air-conditioning system and control method thereof - Google Patents

Intelligent energy-saving central air-conditioning system and control method thereof Download PDF

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Publication number
CN112378054B
CN112378054B CN202011261959.2A CN202011261959A CN112378054B CN 112378054 B CN112378054 B CN 112378054B CN 202011261959 A CN202011261959 A CN 202011261959A CN 112378054 B CN112378054 B CN 112378054B
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air
water
delta
power
cooling tower
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CN112378054A (en
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陈佰满
邱庆辉
肖汉敏
徐如长
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Guangdong Feiyang Industrial Group Co ltd
Dongguan University of Technology
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Guangdong Feiyang Industrial Group Co ltd
Dongguan University of Technology
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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
    • 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
    • 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
    • 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
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • 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
    • 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
    • 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
    • F24F2110/30—Velocity
    • 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
    • F24F2110/40—Pressure, e.g. wind pressure
    • 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
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Fluid Mechanics (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses an intelligent energy-saving central air-conditioning system, which comprises: cold and heat source system, new trend system, a heat pump set for refrigeration or heat supply, arrange the cooling tower that is used for the cooling circulation cooling water and has the recovered energy function outdoors, filter the air, heat, cool, the humidification, purification treatment's wind cabinet, pressurize the cooling water and carry the water pump of cooling tower to the cooling water, control actuating mechanism's intelligent control system, this system includes the DDC controller, and respectively with DDC controller electric connection's temperature sensor, air velocity transducer, tachometric sensor, flow rate sensor, the DDC controller is through the data and the built-in procedure that each sensor gathered, control heat pump set, the cooling tower, the operational parameter of wind cabinet: the power output by the water turbine is preferentially used, and when the power output by the water turbine is insufficient, the power output by the water turbine is supplemented, so that the water temperature in the cooling tower is kept in a set range. A control method of the intelligent energy-saving central air-conditioning system is also disclosed.

Description

Intelligent energy-saving central air-conditioning system and control method thereof
The invention relates to an intelligent energy-saving central air-conditioning system and a control method thereof, which are filed by divisional application, wherein the original application number is 201610885144.9, and the application date is 2016, 10 and 10.
Technical Field
The invention relates to the field of energy conservation, in particular to an intelligent energy-saving central air-conditioning system and a control method thereof.
Background
The central air-conditioning system consists of a cold and heat source system and a fresh air system. The cold and heat source system is used for providing cold or heat for the indoor according to the requirement and ensuring the indoor temperature requirement; the fresh air system has the function of replacing indoor dirty air after outdoor fresh air is subjected to filtration, humidification, purification and other treatment, and the quality and humidity requirements of indoor air are guaranteed. The main energy consumption parts of the central system are a fan and a water pump which drive the fan to operate in the host machine and the cooling tower, and a fan in the fresh air system.
In practical application, in order to ensure the circulation flow of cooling water in a central air conditioner, the lift of a water pump generally has a certain margin, and in a cooling tower driven by a motor for a fan, the energy of the margin is generally wasted along with the spraying of the cooling water.
The fresh air system mainly comprises an air cabinet, a collecting blast pipe, a collecting return air pipe, a branch blast pipe, a branch return air pipe, a fresh air pipe, an exhaust pipe and other parts. The fresh air outside is mixed with part of return air returned from the integrated return air pipe, and then the mixture is sent to the indoor after being processed, and the other part of return air is directly discharged to the outdoor environment through the exhaust pipe.
In general, the air discharged from the exhaust duct has a speed of 6-8 m/s, and in a large building, due to the large air volume, the energy of the air is considerable, but the air is directly discharged into the atmosphere and cannot be utilized at all in the current general method.
Therefore, the prior art needs to be improved and developed to improve the comprehensive utilization rate of energy and reduce the overall energy consumption of the central air conditioner.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide an energy-saving central air conditioning system capable of recovering energy, which can efficiently recover and reuse the surplus water energy and cold energy, and reduce the overall energy consumption of the central air conditioning system.
The cooling tower is matched with a water turbine and an air turbine which are suitable for the water turbine and the air turbine respectively, partial energy consumed by the water pump and the fresh air ventilator is recovered and converted into power for operating the fan of the cooling tower, so that the power of the motor which needs to be matched with the fan is reduced, the fan can be normally operated even without being matched with the motor, and the recovered surplus can be converted into electric energy through the generator and stored under certain conditions. Therefore, the central air-conditioning system is economical and energy-saving.
The technical scheme adopted by the invention for solving the technical problem is as follows:
an intelligent energy-saving central air-conditioning system, comprising: cold and heat source system and new trend system, its characterized in that, it still includes:
the heat pump unit is used for refrigerating or heating, and is used for cooling or heating circulating cooling water to reach required temperature;
a cooling tower disposed outdoors for cooling the circulating cooling water and having a function of recovering energy, the cooling tower being composed of a cooling tower body and a driving mechanism;
the air cabinet is used for filtering, heating, cooling, humidifying and purifying air, and comprises a compressor, a condenser, an expansion valve, an evaporator and other components;
a water pump for pressurizing the cooling water and delivering the cooling water to the cooling tower;
the driving mechanism comprises a transmission shaft, a fan, a water turbine and a gas turbine; the gas turbine is connected with the fan and the water turbine through a speed change bearing or an overrunning clutch on a segmented transmission shaft which is arranged on the same axis and in the vertical direction;
the water turbine is used for recovering energy of the head surplus water flow and converting the energy into power to be output to the fan;
the gas turbine is used for recovering energy of the air flow discharged by the fresh air system, converting the energy into power and outputting the power to the fan;
the intelligent control system comprises a DDC controller, and a temperature sensor, a wind speed sensor, a rotating speed torque sensor and a flow velocity sensor which are respectively and electrically connected with the controller. The controller controls the operation parameters of the heat pump unit, the cooling tower and the air cabinet through data collected by each sensor and a built-in program: the power output by the water turbine is preferentially used, and the power output by the gas turbine is supplemented when the power output by the water turbine is insufficient, so that the water temperature in the cooling tower is kept within a set range.
As a further improvement of the invention, the device is also provided with an auxiliary motor which is connected with the transmission shaft through a reduction gear pair;
the DDC controller calculates the variation of the power required by the fan according to the water temperature in the cooling tower and the current fan rotating speed; driving the auxiliary motor to provide corresponding matched power to enable the fan to operate within a required rotating speed range and enable the water temperature in the cooling tower to be maintained within a set range when the variation and the power provided by the water turbine and the gas turbine are insufficient;
and when the sum of the power provided by the water turbine and the power provided by the gas turbine is larger than the power required by the fan, the DDC controller switches the auxiliary motor into a power generation working mode, so that the auxiliary motor converts surplus energy into electric energy and stores the electric energy in the storage device under the condition that the fan is kept to operate at a required rotating speed.
As a further improvement of the invention, an axial water outlet is arranged at the center of the lower bottom surface of the water turbine and is connected with inlets of water distribution pipes which are coaxial and vertically arranged; and a tangential water inlet is arranged on the outer edge of the water turbine and is connected with a second water return pipeline of the cooling tower.
As a further improvement of the invention, the gas turbine is fixed on the cooling tower by a bracket, the gas inlet is connected with the reducing pipe orifice of the exhaust pipe of the fresh air system, the gas outlet of the gas turbine is connected with the gas outlet pipe, and the gas outlet pipe is connected with the large gas outlet pipe through concentric large and small heads.
As a further improvement of the invention, a water outlet of a condenser of the heat pump unit leads out a first cooling tower water return pipe, and the first cooling tower water return pipe is connected with a water inlet of the water pump; the water inlet of the condenser is connected with a water supply pipe of the cooling tower; the water outlet of the evaporator of the heat pump unit is connected with the return pipe of the air cabinet, the water inlet of the evaporator is connected with the water supply pipe of the air cabinet, and chilled water is conveyed to the air cabinet through the return pipe of the air cabinet to cool the air after being cooled by the evaporator and then conveyed to the evaporator through the water supply pipe of the air cabinet to cool.
As a further improvement of the invention, a water inlet of the air cabinet is connected with a water return pipe of the air cabinet, and a water outlet of the air cabinet is connected with a water supply pipe of the air cabinet; the air supply outlet of the air cabinet is connected with a collecting air supply pipe of the fresh air system, the collecting air supply pipe is connected with a branch air supply pipe, the air return inlet of the air cabinet is connected with a collecting air return pipe of the fresh air system, and the collecting air return pipe is connected with a branch air return pipe; and the fresh air port of the air cabinet is connected with the fresh air pipe of the fresh air system, and the air outlet of the air cabinet is connected with the air exhaust pipe of the fresh air system.
As a further improvement of the invention, the exhaust pipe is connected with a diffuser pipe, the diffuser pipe is connected with a one-way valve, the one-way valve is connected with a small exhaust pipe through a concentric reducer, and the small exhaust pipe is connected with an air inlet of the gas turbine. And the gas from the exhaust pipe is accelerated by the concentric reducer and then works through the gas turbine to drive the fan to operate.
The control method of the intelligent energy-saving central air-conditioning system is characterized by comprising the following steps:
(1) arranging an intelligent control system for controlling the driving mechanism, wherein the intelligent control system comprises a DDC controller, and a temperature sensor, an air speed sensor, a rotating speed torque sensor and a flow velocity sensor which are respectively electrically connected with the controller; setting a function corresponding relation between the water temperature in the cooling tower and the required fan rotating speed;
(2) starting the central air conditioning system, and starting the heat pump unit, the cooling tower and the air cabinet to enable the heat pump unit, the cooling tower and the air cabinet to be in an operating state;
(3) calculating power P of the fan rotating speed required by driving operation and a corresponding required power increment delta P according to data of a temperature sensor and a fan current rotating speed torque sensor in the cooling tower body and a function corresponding relation between preset water temperature and the required fan rotating speed;
(4) calculating the output power P3 and the increment delta P3 of the water turbine in the stable running state at the moment according to a rotating speed sensor of the water turbine or a flow velocity sensor in the inflow pipe;
(5) calculating the increment delta P1 of the fan power P1 according to the rotating speed torque of a fan in the air cabinet or the flow velocity of air in a pipeline;
(6) calculating turbine power P5 and increment delta P5 thereof according to a rotating speed torque sensor of a turbine or the power relationship between the turbine and the turbine, an auxiliary motor and a cooling tower fan;
(7) automatically controlling the temperature of the water in the cooling tower to be kept within a set range according to the following conditions:
when P3 is more than or equal to P and delta P3 is more than or equal to delta P, only the water turbine is operated, the gas turbine is closed, and air is directly discharged into the atmosphere;
when P3 is less than or equal to P and delta P3 is less than or equal to delta P, starting the gas turbine to operate, and when the overrunning clutch is in a combined state, enabling the overrunning clutch to reach a state that P5 + P3 is more than or equal to P and delta P5 + delta P3 is more than or equal to delta P; when the overrunning clutch is in an overrunning state, the air exhausted by the exhaust pipe flows to the air distributor, and the cooling water is exhausted from the air distributor.
As a further improvement of the present invention;
the step (1) further comprises an auxiliary motor;
the step (7) further comprises: if the output power of the auxiliary motor is P2 and the output power increment is Δ P2, then:
the overrunning clutch is in a combined state:
when P5 + P3 is less than or equal to P and delta P5 + delta P3 is less than or equal to delta P, starting the auxiliary motor to operate so that the auxiliary motor reaches the condition that P5 + P2 + P3 is more than or equal to P and delta P5 + delta P2 + delta P3 is more than or equal to delta P, wherein the auxiliary motor is a motor;
the overrunning clutch is in an overrunning state:
the power P required by the operation of the cooling tower fan is reduced, and when P3 is more than or equal to P and delta P3 is more than or equal to delta P, the auxiliary motor starts a power generation mode and stores surplus electric energy in the electric power storage device;
when P3 is less than or equal to P and delta P3 is less than or equal to delta P, the auxiliary motor is a motor, so that P5 + P3 is more than or equal to P and delta P5 + delta P3 is more than or equal to delta P. When P1 + P3-P is more than or equal to 0 and delta P1 + delta P3-delta P is more than or equal to 0, the power generation mode of the auxiliary motor is started, the auxiliary motor is a generator, surplus electric energy is stored in the electric storage device, and the auxiliary motor is driven to output mechanical power outwards when needed.
As a further improvement of the invention, the method also comprises the following steps:
the torque T1 and the rotating speed n 1 of the wind cabinet fan are measured by a torque rotating speed sensor, the power P1 is obtained by a formula (1), the increment of the fan power P1 of the wind cabinet is delta P1, the output power P2 of the auxiliary motor 5 is obtained by a formula (2), the turbine output P3 is obtained by a formula (3), the torque T4 and the rotating speed n 4 of the cooling tower fan are measured by a torque rotating speed sensor, the power P4 is obtained by the formula (1), and the power P5 of the gas turbine is obtained by the formula (4):
the DDC controller controls the valve according to a difference value X between an increment delta P1 of the power P1 of the air cabinet fan and the power P5 of the gas turbine, wherein the difference value X is delta P1-P5, so that the following effects are achieved:
when X is larger than or equal to 0, the DDC controller executes the step (7), and air exhausted by the exhaust pipe flows to the gas turbine;
when X is less than 0, the DDC controller does not execute the step (7), the air exhausted by the exhaust pipe flows to the air distributor, cooling water is exhausted from the air distributor, when P3 is more than or equal to P and delta P3 is more than or equal to delta P, the auxiliary motor starts a power generation mode, and surplus electric energy is stored in the power storage device; when P3 is less than or equal to P and delta P3 is less than or equal to delta P, the auxiliary motor is a motor, so that P5 + P3 is more than or equal to P, and delta P5 + delta P3 is more than or equal to delta P.
When the gas exhausted by the exhaust pipe drives the gas turbine to do work to bring income to the central air-conditioning system, the gas energy is recovered, otherwise, the gas energy is not recovered.
P is power of fan, W
n: rotational speed at any moment, r/min
T: torque at any one time, N m
P1.732U cos α efficiency (2)
P is the power of the motor, W
U: input voltage, V
I: input current, A
cos α: power factor
P＝P n*η t＝γQH*η t (3)
P is power of water turbine, W
γ: water gravity, N/m 3
Q: water flow rate, m 3/s
H: head of water, m
η t: cyclic thermal efficiency
P 5＝P 4-P 2-P 3 (4)
P2: output power of auxiliary motor 5, W
P3: output, W, of the turbine 205
P4: cooling tower fan power, W
P5: power of the gas turbine 206, W
The utility model discloses a cooling tower, including cooling tower delivery port, DDC controller, the cooling tower delivery port department installs temperature sensor (not marking in the picture), detects the cooling water temperature T1 of cooling tower delivery port department, and the difference value delta T of the cooling water temperature T1 of cooling tower delivery port and the temperature T2 that the cooling tower delivery port set up is T1-T2, and the DDC controller is according to the rotational speed control converter of delta T and fan, and converter control auxiliary motor 5 in order to reach following effect: when the delta T is more than or equal to 0, the auxiliary motor 5 outputs power to enable the fan 204 to reach a rated rotating speed; and when the delta T is less than 0, the auxiliary motor 5 absorbs power.
And part of return air returned by the return air pipe is mixed with fresh air coming from the fresh air pipe in the air cabinet, and the mixture is subjected to filtration, heating, cooling, humidification, purification and other treatment and then is sent to each room through the blast pipe. And the other part of return air returned by the return air pipe is sent to the air turbine after being subjected to reducing and accelerating through the exhaust pipe, and drives the air turbine to do work to provide power for the fan. The water pump pressurizes the cooling water from the wind cabinet and then enters the water turbine, the water turbine does work to drive the fan to operate and then enters the water distribution pipe, and the cooling water is sprayed from the water distributor and then returns to the wind cabinet through the water supply pipe of the cooling tower to be recycled.
The proportion of fresh air in the total air of different buildings is different, the air exhaust amount is also different, and the energy provided by the air turbine is also different.
The preferential driving device of the cooling tower fan is a water turbine, when the power provided by the water turbine is insufficient, the water turbine and the gas turbine jointly drive the fan to rotate, and when the power provided by the water turbine and the gas turbine jointly drive is insufficient, the water turbine, the gas turbine and the auxiliary motor jointly drive the fan to rotate, so that the fan operates within a rated rotating speed range.
When the power of the turbine is 0, the preferential driving device of the cooling tower fan is still the turbine, and when the power provided by the turbine is insufficient, the turbine and the auxiliary motor drive the fan to rotate together.
When the power provided by the water turbine and the steam turbine is larger than the power required by the fan, the auxiliary motor is changed into a generator, and the generator converts surplus energy into electric energy and stores the electric energy in the electricity storage device under the condition that the fan runs at a rated rotating speed.
The energy recovery of the energy-saving central air-conditioning system capable of performing energy recovery is realized in two aspects:
firstly, in the existing cooling tower of a central air conditioner, in order to ensure the flow of cooling water of a system, the lift of a water pump is generally larger than the actually required lift of the cooling tower, and the surplus lift has certain energy.
The speed of air exhausted by the fresh air system is generally 6-8 m/s, and the air system has certain kinetic energy, and the energy of the air system is recovered by a gas turbine or an air distribution pipe.
The beneficial effects of the invention are as follows:
1. energy is saved. The surplus energy of the water pump is recovered through a water turbine; the air kinetic energy of the air at the air outlet is recovered through the air turbine, and the recovered energy is converted into the power of the cooling tower fan. The energy consumption of the motor is reduced, even the motor is not needed or power is generated externally, and the utilization efficiency of energy is improved.
2. Is economical. The motor is used as high-energy-consumption equipment, the purpose of greatly reducing the power of the motor of the cooling tower is realized by transforming the central air conditioner, and even the motor is not needed, so the invention can save a large amount of electric energy and has good economical efficiency.
3. The operation is stable. The cooling water flow, the exhaust air flow and the power of the motor in the central air-conditioning system are generally constant, so that the cooling tower fan operates under a relatively stable condition, and the whole system also operates under a stable condition.
The technical scheme of the invention is described above, and the invention is further explained with reference to the accompanying drawings and the detailed description.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a central air conditioning system.
FIG. 2 is a schematic perspective view of a cooling tower construction.
Fig. 3 is a schematic structural view of the air distributor.
Fig. 4 is a partially enlarged view of the cooling tower drive mechanism.
Fig. 5 is a schematic diagram of the internal structure of the heat pump unit.
FIG. 6 is an enlarged view of a portion of the turbine inlet and exhaust duct connection.
Wherein, the reference numerals of each part are as follows:
A. cold and heat source system B and fresh air system
1. The system comprises a heat pump unit 101, a compressor 102, a condenser 103, an expansion valve 104, an evaporator 2, a cooling tower 201, a cooling tower body 202, a driving mechanism 203, a sectional transmission shaft 204, a fan 205, a water turbine 206, a gas turbine 207, a reduction gear set 208, a support 209, a gas turbine outlet pipe 210, a large outlet pipe 3, an air cabinet 4, a water pump 5, an auxiliary motor 6, a first cooling tower return pipe 7, a second cooling tower return pipe 8, a cooling tower water supply pipe 9, an air cabinet return pipe 10, an air cabinet water supply pipe 11, a collective air supply pipe 12, a collective air return pipe 13, a fresh air pipe 14, an exhaust pipe 15, a small exhaust pipe 16, a water distribution pipe 17, a branch air supply pipe 18, a branch air return pipe 19, a one-way valve 20, a diffuser pipe 21, a valve 22, an air distributor 23 and an air distributor inlet pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and 6, the present invention provides an intelligent energy-saving central air conditioning system and a control method thereof, wherein the intelligent energy-saving central air conditioning system capable of recovering energy comprises: cold and heat source system A and new trend system B, it still includes:
the heat pump unit 1 is used for refrigerating or heating, and the heat pump unit 1 is used for cooling or heating circulating cooling water to reach required temperature;
a cooling tower 2 disposed outdoors for cooling the circulating cooling water and having a function of recovering energy; the cooling tower 2 is composed of a cooling tower body 201 and a driving mechanism 202.
An air cabinet 3 for filtering, heating, cooling, humidifying and purifying the air, and a water pump 4 for pressurizing the cooling water and conveying the cooling water to the cooling tower 2;
the air cabinet 3 includes a compressor 101, a condenser 102, an expansion valve 103, an evaporator 104, and the like.
The driving mechanism 202 comprises a transmission shaft 203, a fan 204, a water turbine 205 and a gas turbine 206; the turbine 206 is connected with the fan 204 and the turbine 205 through a variable speed bearing or an overrunning clutch on a sectional transmission shaft 203 which is arranged on the same axis and in the vertical direction;
the water turbine 205 is used for recovering energy of the head surplus water flow and converting the energy into power to be output to the fan 204;
the gas turbine 206 is used for recovering energy of the air flow discharged by the fresh air system, converting the energy into power and outputting the power to the fan 204;
the intelligent control system comprises a DDC controller, and a temperature sensor, an air speed sensor, a rotating speed and torque sensor and a flow velocity sensor which are electrically connected with the controller respectively. The controller controls the operation parameters of the heat pump unit 1, the cooling tower 2 and the air cabinet 3 through data collected by each sensor and a built-in program: the power output by the water turbine 205 is preferentially used, and when the power output by the water turbine 206 is insufficient, the power is supplemented, so that the water temperature in the cooling tower is kept within a set range.
The intelligent energy-saving central air-conditioning system of the embodiment is further provided with an auxiliary motor 5, and the auxiliary motor 5 is connected with the transmission shaft 203 through a reduction gear set 207.
The DDC controller calculates the variation delta P of the power required by the fan 204 according to the water temperature in the cooling tower 2 and the current rotating speed of the fan 204; driving the auxiliary motor 5 to provide corresponding matched power according to the variation and the power provided by the water turbine 205 and the gas turbine 206, so that the fan 204 operates within a required rotating speed range, and the water temperature in the cooling tower 2 is maintained within a set range;
when the sum of the power provided by the water turbine 205 and the power provided by the gas turbine 206 is larger than the power required by the fan 204, the DDC controller switches the auxiliary motor 5 to the power generation operation mode, so that the fan 204 operates at the required speed, and the auxiliary motor 5 converts the surplus energy into electric energy and stores the electric energy in the storage device. An axial water outlet is arranged at the center of the lower bottom surface of the water turbine 205 and is connected with inlets of the water distribution pipes 16 which are coaxially and vertically arranged; and a tangential water inlet is formed in the outer edge of the water turbine 205 and is connected with a second water return pipe 7 of the cooling tower 2.
The gas turbine 206 is fixed on the cooling tower 2 by a support 208, the gas inlet is connected with the gas outlet of the one-way valve 19 after diameter changing, the gas inlet of the one-way valve 19 is connected with the diffuser pipe 20, the diffuser pipe 20 is connected with the pipe orifice of the exhaust pipe 14 of the fresh air system B, the gas outlet of the gas turbine is connected with a gas turbine outlet pipe 209, and the gas turbine outlet pipe 209 is connected with a big outlet pipe 210 through a concentric big end and a small end.
The air distributor 22 is connected with the outlet of the air distributor air inlet pipe 23, the inlet of the air distributor air inlet pipe 23 is connected with the valve 21, the air discharged by the exhaust pipe 14 has the characteristics of high dryness and low temperature, and the cooling water is discharged from the air distributor 22.
A first cooling tower return pipe 6 is led out from a water outlet of a condenser of the heat pump unit 1, and the other end of the first cooling tower return pipe 6 is connected with a water inlet of the water pump; the water inlet of the condenser 102 is connected with the cooling tower water supply pipe 8. The water outlet of the evaporator 104 of the heat pump unit 1 is connected with the air cabinet water return pipe 9, the water inlet of the evaporator is connected with the air cabinet water supply pipe 10, and chilled water is cooled by the evaporator 104 and then conveyed to the air cabinet 3 through the air cabinet water return pipe 9, and then conveyed to the evaporator 104 through the air cabinet water supply pipe 10 to be cooled.
The water inlet of the air cabinet 3 is connected with the air cabinet water return pipe 9, and the water outlet is connected with the air cabinet water supply pipe 10; an air supply outlet of the air cabinet 3 is connected with a collecting air supply pipe 11 of the fresh air system B, the collecting air supply pipe 11 is connected with a branch air supply pipe 17, an air return inlet of the air cabinet is connected with a collecting air return pipe 12 of the fresh air system B, and the collecting air return pipe 12 is connected with a branch air return pipe 18; and a fresh air inlet of the air cabinet 3 is connected with a fresh air pipe 13 of the fresh air system B, and an air outlet of the air cabinet 3 is connected with an air exhaust pipe 14 of the fresh air system B.
The exhaust pipe 14 is connected with a diffuser pipe 20, the diffuser pipe 20 is connected with a one-way valve 19, the one-way valve 19 is connected with a small exhaust pipe 15 through concentric large and small heads, and the small exhaust pipe 15 is connected with an air inlet of the gas turbine 206. The gas from the exhaust duct 14 is accelerated by concentric reducer and then works by the gas turbine 206, driving the fan 204 to operate.
Part of return air returned by the air return pipe 12 and fresh air coming by the fresh air pipe 13 are mixed in the air cabinet 3, and are subjected to filtration, heating, cooling, humidification, purification and the like, and then are sent to each room through the blast pipe 17. The other part of the return air returned by the integrated return air pipe 12 is sent to the gas turbine 206 after being subjected to reducing and accelerating through the exhaust pipe 14, and the gas turbine is driven to work to provide power for the fan 204. The water pump 4 pressurizes the cooling water from the wind cabinet 3, then the pressurized cooling water enters the water turbine 205, works in the water turbine 205 to drive the fan 204 to operate, then the working water enters the water distribution pipe 16, and after the cooling water is sprayed from the water distribution pipe 16 and cooled, the cooling water returns to the wind cabinet 3 through the cooling tower water supply pipe 8 to be recycled.
The proportion of fresh air in the total air of different buildings is different, the air exhaust amount is also different, and the energy provided by the air turbine is also different.
The preferential driving device of the cooling tower fan 204 is a water turbine 205, when the power provided by the water turbine 205 is insufficient, the water turbine 205 and a gas turbine 206 drive the fan to rotate together, and when the power provided by the water turbine 205 and the gas turbine 206 are insufficient, the water turbine 205, the gas turbine 206 and an auxiliary motor 5 drive the fan 204 to rotate together, so that the fan 204 operates in a rated rotating speed range.
When the power P1 of the water turbine 205 is 0, the preferential driving device of the cooling tower fan 204 is still the water turbine 205, and when the power provided by the water turbine 205 is insufficient, the water turbine 205 and the auxiliary motor 5 drive the fan to rotate together. When the power provided by the water turbine 205 and the gas turbine 206 is larger than the power required by the fan 204, the auxiliary motor 5 is changed into a generator, and the generator converts surplus energy into electric energy and stores the electric energy in the storage device under the condition that the fan 204 runs at a rated speed.
The embodiment of the invention also provides a control method of the intelligent energy-saving central air-conditioning system, which comprises the following steps:
(1) arranging an intelligent control system for controlling the driving mechanism 202, wherein the intelligent control system comprises a DDC controller, and a temperature sensor, an air speed sensor, a rotating speed torque sensor and a flow velocity sensor which are respectively electrically connected with the controller, the controller is internally provided with data and a built-in program which are acquired according to each sensor, and the operating parameters of the heat pump unit 1, the cooling tower 2 and the air cabinet 3 are controlled through the operation of the program; setting a functional corresponding relation between the water temperature in the cooling tower 2 and the rotating speed of the required fan 204;
(2) starting a central air conditioning system, and starting a heat pump unit 1, a cooling tower 2 and an air cabinet 3 to enable the heat pump unit, the cooling tower 2 and the air cabinet 3 to be in an operating state;
(3) calculating the power P of the fan rotating speed required by the driving operation and the corresponding required power increment delta P according to the data of a temperature sensor and a current rotating speed torque sensor of the fan 204 in the cooling tower 2 and the function corresponding relation between the preset water temperature and the required fan 204 rotating speed;
(4) calculating the output power P3 of the water turbine 205 in a stable running state at the moment according to the rotating speed sensor of the water turbine 205 or the flow velocity sensor in the inflow pipe;
(5) calculating increment delta P1 of fan power P1 according to rotating speed torque of a fan (not marked in the figure) in the air cabinet or flow velocity of air in a pipeline;
(6) calculating the power P5 of the gas turbine 206 according to the rotating speed torque sensor of the gas turbine 206 or the power relation between the gas turbine 206 and the water turbine 205, the auxiliary motor 5 and the cooling tower fan 204;
(7) the automatic control is carried out according to the following conditions, so that the water temperature in the cooling tower 2 is kept in a set range:
when P3 is more than or equal to P and delta P3 is more than or equal to delta P, only the water turbine 205 is operated, the gas turbine 206 is closed, and air is directly discharged into the atmosphere;
when P3 is less than or equal to P and delta P3 is less than or equal to delta P, the gas turbine 206 is started to operate, and when the overrunning clutch is in a combined state, P5 + P3 is more than or equal to P and delta P5 + delta P3 is more than or equal to delta P; when the overrunning clutch is in the overrunning state, the air discharged from the exhaust pipe flows to the air distributor 22, and the cooling water is discharged from the air distributor 22.
The step (1) further comprises an auxiliary motor 5;
the step (7) further comprises: assuming that the output power of the auxiliary motor 5 is P2 and the output power increment thereof is Δ P2, then:
the overrunning clutch is in a combined state:
when P5 + P3 is less than or equal to P and delta P5 + delta P3 is less than or equal to delta P, starting the auxiliary motor 5 to operate, so that when P5 + P2 + P3 is more than or equal to P and delta P5 + delta P2 + delta P3 is more than or equal to delta P, the auxiliary motor 5 is a motor;
the overrunning clutch is in an overrunning state:
the power P required by the operation of the cooling tower fan 204 is reduced, and when P3 is more than or equal to P and delta P3 is more than or equal to delta P, the auxiliary motor 5 starts a power generation mode and stores surplus electric energy in the electric power storage device;
when P3 is less than or equal to P and delta P3 is less than or equal to delta P, the auxiliary motor 5 is a motor, so that P5 + P3 is more than or equal to P and delta P5 + delta P3 is more than or equal to delta P.
When P1 + P3-P is more than or equal to 0 and delta P1 + delta P3-delta P is more than or equal to 0, the power generation mode of the auxiliary motor 5 is started, the auxiliary motor 5 is a generator, surplus electric energy is stored in the electric storage device, and the auxiliary motor 5 is driven to output mechanical power to the outside when needed.
The torque T1 and the rotational speed n 1 of the fan (not shown) of the wind box 3 are measured by a torque rotational speed sensor, the power P1 is obtained by formula (1), the increment of the fan power P1 of the wind box 3 is Δ P1, the output power P2 of the auxiliary motor 5 is obtained by formula (2), the output power P3 of the water turbine 205 is obtained by formula (3), the torque T4 and the rotational speed n 4 of the cooling tower fan 204 are measured by a torque rotational speed sensor, the power P4 is obtained by formula (1), and the power P5 of the gas turbine 206 is obtained by formula (4).
The DDC controller controls the valve 21 according to a difference X between an increment Δ P1 of the power P1 of the fan of the wind cabinet 3 and the power P5 of the gas turbine 206, which is Δ P1-P5, so as to achieve the following effects:
when X is larger than or equal to 0, the DDC controller executes the step (7), and the air exhausted by the exhaust pipe 14 flows to the gas turbine 206;
when X is less than 0, the DDC controller does not execute the step (7), the air discharged by the exhaust pipe 14 flows to the air distributor 22, the cooling water is discharged from the air distributor 22, and when P3 is more than or equal to P and delta P3 is more than or equal to delta P, the auxiliary motor 5 starts a power generation mode and stores surplus electric energy in the electric power storage device; when P3 is less than or equal to P and delta P3 is less than or equal to delta P, the auxiliary motor 5 is a motor, so that P5 + P3 is more than or equal to P and delta P5 + delta P3 is more than or equal to delta P.
When the gas exhausted from the exhaust duct 14 drives the gas turbine to do work and bring income to the central air conditioning system, the gas energy is recovered, otherwise, the gas energy is not recovered.
P is the power of the fan, W
n: rotational speed at any moment, r/min
T: torque at any one time, N m
P1.732U cos α efficiency (2)
P is the power of the motor, W
U: input voltage, V
I: input current, A
cos α: power factor
P＝P n*η t＝γQH*η t (3)
P is the output power of the water turbine, W
γ: water gravity, N/m 3
Q: water flow rate, m 3/s
H: head of water, m
η t: cyclic thermal efficiency
P 5 ＝P 4-P 2-P 3 (4)
P2: output power of auxiliary motor 5, W
P3: output, W, of the turbine 205
P4: cooling tower fan power, W
P5: power, W, of the gas turbine 206
A temperature sensor (not shown in the figure) is installed at the water outlet of the cooling tower 2, the temperature sensor detects the temperature T1 of the cooling water at the water outlet of the cooling tower 2, the difference value Δ T between the temperature T1 of the cooling water at the water outlet of the cooling tower 2 and the temperature T2 set at the water outlet of the cooling tower 2 is T1-T2, the DDC controller controls the frequency converter according to the Δ T and the rotating speed of the fan 204, and the frequency converter controls the auxiliary motor 5 to achieve the following effects: when the delta T is more than or equal to 0, the auxiliary motor 5 outputs power to enable the fan 204 to reach a rated rotating speed; and when the delta T is less than 0, the auxiliary motor 5 absorbs power.
The cooling tower is matched with a suitable water turbine and an air turbine, partial energy consumed by the water pump and the fresh air ventilator is recovered and converted into power for operating the fan of the cooling tower, so that the power of the motor which needs to be matched with the fan is reduced, the fan can be operated normally even without being matched with the motor, and the recovered surplus can be converted into electric energy and stored through the generator under certain conditions, so that the economic and energy-saving effects are achieved.
The energy recovery of the energy-saving central air-conditioning system capable of performing energy recovery is realized in two aspects:
1. in the existing cooling tower of the central air conditioner, in order to ensure the flow of cooling water of a system, the lift of a water pump is generally larger than the actually required lift of the cooling tower, and the surplus lift has certain energy.
2. The air speed discharged by the fresh air system is generally 6-8 m/s, and the fresh air system has certain kinetic energy, and the energy of the fresh air system is recovered by a gas turbine or a gas distribution pipe.
The invention mainly focuses on:
1. and energy is saved. The surplus energy of the water pump is recycled through a water turbine; the air kinetic energy of the air at the air outlet is recovered through the air turbine, and the recovered energy is converted into the power of the cooling tower fan. The energy consumption of the motor is reduced, the motor or external power generation is even not needed, and the utilization efficiency of energy is improved.
2. Is economical. The motor is used as high-energy-consumption equipment, the purpose of greatly reducing the power of the motor of the cooling tower is realized by transforming the central air conditioner, and even the motor is not needed, so the invention can save a large amount of electric energy and has good economical efficiency.
3. The operation is stable. The cooling water flow, the exhaust air flow and the power of the motor in the central air-conditioning system are generally constant, so that the fan of the cooling tower runs under a relatively stable condition, and the whole system also runs under a stable condition.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that the technical features similar to or similar to the above-described embodiment of the present invention are all within the protective scope of the present invention.

Claims (9)

1. An intelligent energy-saving central air-conditioning system, comprising: cold and heat source system and new trend system, its characterized in that, it still includes:
the heat pump unit is used for refrigerating or heating, and is used for cooling or heating circulating cooling water to reach a required temperature;
a cooling tower disposed outdoors for cooling the circulating cooling water and having a function of recovering energy, the cooling tower being composed of a cooling tower body and a driving mechanism;
the air cabinet is used for filtering, heating, cooling, humidifying and purifying air, and comprises a compressor, a condenser, an expansion valve, an evaporator and other components;
a water pump for pressurizing the cooling water and delivering the cooling water to the cooling tower;
the driving mechanism comprises a transmission shaft, a fan, a water turbine and a gas turbine; the turbine is connected with the fan, the turbine and the turbine through a speed change bearing or an overrunning clutch on a sectional transmission shaft which is arranged on the same axis and in the vertical direction;
the water turbine is used for recovering energy of the head surplus water flow and converting the energy into power to be output to the fan;
the gas turbine is used for recovering energy of the air flow discharged by the fresh air system, converting the energy into power and outputting the power to the fan;
it still includes a control actuating mechanism's intelligent control system, this intelligent control system include the DDC controller and respectively with this controller electric connection's temperature sensor, air velocity transducer, speed sensor, velocity of flow sensor, this controller is right through the data and the built-in procedure that each sensor gathered the operating parameter of heat pump set, cooling tower, wind cabinet is controlled: the power output by the water turbine is preferentially used, and the power output by the gas turbine is supplemented when the power output by the water turbine is insufficient, so that the water temperature in the cooling tower is kept within a set range.
2. The intelligent energy-saving central air-conditioning system according to claim 1, characterized in that an auxiliary motor is further provided, and the auxiliary motor is connected with the transmission shaft through a reduction gear pair;
the DDC controller calculates the variable quantity of the power required by the fan according to the water temperature in the cooling tower and the current fan rotating speed; driving the auxiliary motor to provide corresponding matched power according to the variable quantity and the power supplied by the water turbine and the gas turbine when the variable quantity and the power supplied by the water turbine and the gas turbine are insufficient, so that the fan can operate within a required rotating speed range, and the water temperature in the cooling tower is maintained within a set range;
and when the sum of the power provided by the water turbine and the power provided by the gas turbine is larger than the power required by the fan, the DDC controller switches the auxiliary motor into a power generation working mode, so that the auxiliary motor converts surplus energy into electric energy and stores the electric energy in the storage device under the condition that the fan is kept to operate at the required rotating speed.
3. The intelligent energy-saving central air-conditioning system according to claim 1, wherein an axial water outlet is arranged at the center of the lower bottom surface of the water turbine and is connected with inlets of water distribution pipes which are coaxially and vertically arranged; a tangential water inlet is formed in the outer edge of the water turbine and is connected with a second water return pipeline of the cooling tower; the gas turbine is fixed on the cooling tower by a support, an air inlet is connected with the reducing pipe orifice of the exhaust pipe of the fresh air system, an air outlet is connected with an air outlet pipe, and the air outlet pipe is connected with a large air outlet pipe through a concentric reducer.
4. The intelligent energy-saving central air-conditioning system according to claim 2, wherein a first cooling tower return pipe is led out from a water outlet of a condenser of the heat pump unit, and the first cooling tower return pipe is connected with a water inlet of a water pump; the water inlet of the condenser is connected with a water supply pipe of the cooling tower; the water outlet of the evaporator of the heat pump unit is connected with the return pipe of the air cabinet, and the water inlet of the evaporator is connected with the water supply pipe of the air cabinet.
5. The intelligent energy-saving central air-conditioning system according to claim 1, wherein the water inlet of the air cabinet is connected with the water return pipe of the air cabinet, and the water outlet of the air cabinet is connected with the water supply pipe of the air cabinet; the air supply outlet of the air cabinet is connected with a collecting air supply pipe of the fresh air system, and the air return inlet is connected with a collecting air return pipe of the fresh air system; the fresh air inlet of the wind cabinet is connected with the fresh air inlet of the fresh air system, and the air outlet of the wind cabinet is connected with the exhaust pipe of the fresh air system.
6. The intelligent energy-saving central air-conditioning system according to claim 1, wherein the exhaust pipe is connected with a small exhaust pipe through a concentric reducer, the small exhaust pipe is connected with the air inlet of the gas turbine, and the gas from the exhaust pipe is accelerated through the concentric reducer and then works through the gas turbine to drive the fan to operate.
7. The control method of the intelligent energy-saving central air-conditioning system according to any one of claims 1 to 6, characterized by comprising the following steps:
(1) arranging an intelligent control system for controlling the driving mechanism, wherein the intelligent control system comprises a DDC controller, and a temperature sensor, an air speed sensor, a rotating speed sensor and a flow velocity sensor which are respectively electrically connected with the controller; setting a function corresponding relation between the water temperature in the cooling tower and the required fan rotating speed;
(2) starting the central air conditioning system, and starting the heat pump unit, the cooling tower and the air cabinet to enable the heat pump unit, the cooling tower and the air cabinet to be in an operating state;
(3) calculating power P of the fan rotating speed required by driving operation and a corresponding required power increment delta P according to data of a temperature sensor and a current fan rotating speed sensor in the cooling tower body and a function corresponding relation between a preset water temperature and the required fan rotating speed;
(4) calculating the output power P3 and the increment delta P3 of the water turbine in the stable running state at the moment according to a rotating speed sensor of the water turbine or a flow velocity sensor in the inflow pipe;
(5) calculating the fan power P1 and the increment delta P1 thereof according to the rotating speed torque of a fan in the air cabinet or the flow velocity of air in a pipeline;
(6) calculating turbine power P5 and increment delta P5 thereof according to a rotating speed torque sensor of a turbine or the power relationship between the turbine and the turbine, an auxiliary motor and a cooling tower fan;
(7) automatically controlling the temperature of the water in the cooling tower to be kept within a set range according to the following conditions:
when P3 is more than or equal to P and delta P3 is more than or equal to delta P, only the water turbine is operated, the gas turbine is closed, and air is directly discharged into the atmosphere;
when P3 is less than or equal to P and delta P3 is less than or equal to delta P, starting the gas turbine to operate, and when the overrunning clutch is in a combined state, enabling the overrunning clutch to reach a state that P5 + P3 is more than or equal to P and delta P5 + delta P3 is more than or equal to delta P; when the overrunning clutch is in the overrunning state, the air exhausted by the exhaust pipe flows to the air distributor, and the cooling water is exhausted from the air distributor.
8. The control method of an intelligent energy-saving central air-conditioning system according to claim 7,
the step (1) also comprises an auxiliary motor;
the step (7) further comprises: if the output power of the auxiliary motor is P2 and the output power variable is Δ P2, then:
firstly, an overrunning clutch is in a combined state:
when P5 + P3 is less than or equal to P and delta P5 + delta P3 is less than or equal to delta P, starting the auxiliary motor to operate so that the auxiliary motor reaches the condition that P5 + P2 + P3 is more than or equal to P and delta P5 + delta P2 + delta P3 is more than or equal to delta P, wherein the auxiliary motor is a motor;
the overrunning clutch is in an overrunning state:
the power P required by the operation of the cooling tower fan is reduced, and when P3 is more than or equal to P and delta P3 is more than or equal to delta P, the auxiliary motor starts a power generation mode and stores surplus electric energy in the electric power storage device;
when P3 is less than or equal to P and delta P3 is less than or equal to delta P, the auxiliary motor is a motor, so that P5 + P3 is more than or equal to P and delta P5 + delta P3 is more than or equal to delta P.
9. The control method of the intelligent energy-saving central air-conditioning system according to claim 8, characterized by further comprising the steps of:
the auxiliary motor is a generator motor;
when P5 + P3-P is more than or equal to 0 and delta P5 + delta P3-delta P is more than or equal to 0, the power generation mode of the auxiliary motor is started, surplus electric energy is stored in the electric storage device, and the auxiliary motor is driven to output mechanical power outwards when needed.
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