CN115127246A - Energy-saving system and method of chiller controlled by frequency converter - Google Patents

Abstract

The invention relates to the field of chilled water system regulation, and provides an inverter-controlled chiller energy-saving system and method, comprising: an air supply unit, a hydrogen compressor, a first chilled water unit, a second chilled water unit, a heat exchanger, a hydrogenation machine, The venting unit and the hydrogenation vehicle; the gas supply unit is connected with the hydrogen compressor, the hydrogen compressor is connected with the first cold water unit, the hydrogen compressor is connected with the venting unit, the hydrogen compressor is connected with the heat exchanger, and the heat exchanger is connected with the second cold water The unit is connected, the heat exchanger is connected with the hydrogenation machine, the hydrogenation machine is connected with the hydrogenation vehicle, and the hydrogenation machine is connected with the discharge unit. The invention adjusts the power of the chiller according to the water temperature difference between the water inlet and the outlet of the chiller and the load range of the guide vanes, so that the chiller has obvious energy-saving effect when starting and running; the frequency converter is used to drive the chiller, which improves the The operating performance of the chiller prevents surge and enhances the flexibility of operation adjustment.

Description

Energy-saving system and method of chiller controlled by frequency converter

technical field

The invention relates to the field of chilled water system regulation, in particular to an energy-saving system and method for a chiller controlled by a frequency converter.

Background technique

At present, general hydrogen refueling stations use air-cooled glycol chilled water units dedicated to H2 cooling systems. The chilled water units use AC three-phase electricity with a working frequency of 380V50HZ as power energy. The power of the chilled water unit used in the hydrogen refueling station is 15KW to 260KW; in production and use, the chilled water unit runs with the start and stop of the hydrogen booster compressor and hydrogen refueling machine. During this period, the chilled water unit runs. It runs at a fixed frequency of 50HZ; when the outlet water temperature of the chilled water unit reaches the demand value, the chilled water unit also runs at a fixed frequency of 50HZ; high-power power-consuming equipment operates in this way for a long time. The power consumption is also not to be underestimated, which is also a waste of energy.

The above content is only used to assist the understanding of the technical solutions of the present invention, and does not mean that the above content is the prior art.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to solve the technical problem of excessive power consumption of the air-cooled glycol chilled water unit dedicated to the H ₂ cooling system in the prior art.

In order to achieve the above purpose, the present invention provides an energy-saving system for a chiller controlled by a frequency converter, comprising: an air supply unit, a hydrogen compressor, a first chiller unit, a second chiller unit, a heat exchanger, a hydrogenation machine, a venting unit and Hydrogenated vehicles;

The air supply unit is connected to the hydrogen compressor, the hydrogen compressor is connected to the first cold water unit, the discharge port of the hydrogen compressor is connected to the first inlet of the discharge unit, and the hydrogen compressor is connected to the first inlet of the discharge unit. The hydrogen outlet of the machine is connected to the air inlet of the heat exchanger, the heat exchanger is connected to the second cold water unit, the air outlet of the heat exchanger is connected to the air inlet of the hydrogenation machine, The filling port of the hydrogenation machine is connected with the hydrogenation vehicle, and the venting port of the hydrogenation machine is connected with the second inlet of the venting unit.

Preferably, the connection between the gas supply unit and the hydrogen compressor is specifically:

The nitrogen outlet of the air supply unit is connected to one end of the first air valve, and the other end of the first air valve is connected to the nitrogen inlet of the hydrogen compressor;

The hydrogen outlet of the gas supply unit is connected to one end of the second gas valve, and the other end of the second gas valve is connected to the hydrogen inlet of the hydrogen compressor.

Preferably, the first chiller unit includes: a fourth water valve, a fifth water valve, a first temperature sensor, a second temperature sensor and a first chiller;

The connection between the hydrogen compressor and the first cold water unit is specifically:

The water outlet of the hydrogen compressor is connected to one end of the second temperature sensor and the fifth water valve, and the other end of the fifth water valve is connected to the water inlet of the first chiller;

The water inlet of the hydrogen compressor is connected to one end of the first temperature sensor and the fourth water valve, and the other end of the fourth water valve is connected to the water outlet of the first chiller.

Preferably, the first chiller comprises: a first frequency converter, a first chiller compressor, a first cooling fan, a first controller and a first guide vane;

The first controller is electrically connected with the first temperature sensor, the second temperature sensor, the first frequency converter and the first guide vane, and the frequency converter is connected with the first cold water compression Electrically connected, the first cold water compressor is electrically connected with the first cooling fan.

Preferably, the second chiller unit includes: a sixth water valve, a seventh water valve, a third temperature sensor, a fourth temperature sensor and a second chiller;

The hydrogen outlet of the hydrogen compressor is connected to the air inlet of the heat exchanger, and the heat exchanger is connected to the second cold water unit, specifically:

The hydrogen outlet of the hydrogen compressor is connected to one end of the third air valve, and the other end of the third air valve is connected to the air inlet of the heat exchanger;

The water outlet of the heat exchanger is connected to one end of the fourth temperature sensor and the seventh water valve, and the other end of the seventh water valve is connected to the water inlet of the second chiller;

The water inlet of the heat exchanger is connected to one end of the third temperature sensor and the sixth water valve, and the other end of the sixth water valve is connected to the water outlet of the second chiller.

Preferably, the second chiller comprises: a second frequency converter, a second chiller compressor, a second cooling fan, a second controller and a second guide vane;

The second controller is electrically connected with the third temperature sensor, the fourth temperature sensor, the second frequency converter and the second guide vane, and the frequency converter is compressed with the second cold water Electrically connected, the second cold water compressor is electrically connected with the second cooling fan.

Preferably, the connection between the air outlet of the heat exchanger and the air inlet of the hydrogenation machine is as follows:

The air outlet of the heat exchanger is connected to one end of the eighth air valve, and the other end of the eighth air valve is connected to the air inlet of the hydrogenation machine.

An energy-saving method for a chiller controlled by a frequency converter, which is realized based on the energy-saving system for a water chiller controlled by the frequency converter, comprising the steps of:

S1: Start the chiller energy-saving system controlled by the inverter, set the load range of the first guide vanes in the first chiller, and the load of the second guide vanes in the second chiller scope;

S2: The first temperature sensor detects the water outlet temperature T ₁ of the first chiller in real time, the second temperature sensor detects the inlet water temperature T ₂ of the first chiller in real time; the third temperature sensor detects in real time Detecting the outlet water temperature T ₃ of the second chiller, and the fourth temperature sensor detects the inlet water temperature T ₄ of the second chiller in real time;

S3 _: Adjust the working state of the first chiller according to the load range of the first guide vane, the outlet water temperature T1 of the _first chiller, and the inlet water temperature T2 of the first chiller; _The load range of the second guide vane, the outlet water temperature T3 of the second chiller unit and the inlet water temperature T4 _of the second chiller unit adjust the working state of the second chiller unit.

Preferably, step S3 is specifically:

S31: If the load range of the first guide vane is 70% to 100%, the first guide vane is fully opened; if the load range of the first guide vane is lower than 70%, the first guide vane is A guide vane begins to close, when the load range of the first guide vane is 50%, the first guide vane is fully closed; if the load range of the first guide vane is lower than 50%, the The first cold water compressor starts to increase power, and when the load range of the first guide vane is 20%, the first cold water compressor increases to a maximum of 130%;

If the value of the outlet water temperature T ₁ minus the inlet water temperature T ₂ is greater than the preset value T ₅ , the first cold water compressor is adjusted to work at 150% of the current operating power, otherwise the first cold water compressor The machine works according to the current operating power;

S32: If the load range of the second guide vane is 70% to 100%, the second guide vane is fully opened; if the load range of the second guide vane is lower than 70%, the second guide vane is The second guide vane begins to close, and the second guide vane is fully closed when the load range of the second guide vane is 50%; if the load range of the second guide vane is lower than 50%, the second guide vane is fully closed. The second cold water compressor starts to increase power, and when the load range of the second guide vane is 20%, the second cold water compressor increases to a maximum of 130%;

If the value of the outlet water temperature T ₃ minus the inlet water temperature T ₄ is greater than the preset value T ₆ , the second cold water compressor is adjusted to work at 150% of the current operating power, otherwise the second cold water compressor The machine works according to the current operating power.

The present invention has the following beneficial effects:

1. Adjust the power of the chiller according to the water temperature difference between the water inlet and the outlet of the chiller and the load range of the guide vanes, so that the startup and operation of the chiller have obvious energy-saving effects;

2. The frequency converter is used to drive the chiller, which improves the running performance of the chiller, prevents surge, and enhances the flexibility of operation adjustment.

Description of drawings

1 is a system structure diagram of an embodiment of the present invention;

2 is a flow chart of a method according to an embodiment of the present invention;

The realization, functional characteristics and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

1, the present invention provides an energy-saving system for a chiller controlled by a frequency converter, including: an air supply unit 13, a hydrogen compressor 14, a first chiller unit, a second chiller unit, a heat exchanger 17, a hydrogenation machine 19, Drain unit 16 and hydrogen refueling vehicle 20;

The gas supply unit 13 is connected to the hydrogen compressor 14 , the hydrogen compressor 14 is connected to the first cold water unit, and the discharge port of the hydrogen compressor 14 is connected to the first inlet of the discharge unit 16 , the hydrogen outlet of the hydrogen compressor 14 is connected to the air inlet of the heat exchanger 17, the heat exchanger 17 is connected to the second cold water unit, and the air outlet of the heat exchanger 17 is connected to the The intake port of the hydrogenation machine 19 is connected, the filling port of the hydrogenation machine 19 is connected with the hydrogenation vehicle 20 , and the discharge port of the hydrogenation machine 19 is connected with the second inlet of the discharge unit 16 .

In this embodiment, the connection between the gas supply unit 13 and the hydrogen compressor 14 is as follows:

The nitrogen outlet of the gas supply unit 13 is connected to one end of the first gas valve 1, and the other end of the first gas valve 1 is connected to the nitrogen inlet of the hydrogen compressor 14;

The hydrogen outlet of the gas supply unit 13 is connected to one end of the second gas valve 2 , and the other end of the second gas valve 2 is connected to the hydrogen inlet of the hydrogen compressor 14 .

In this embodiment, the first chiller unit includes: a fourth water valve 4 , a fifth water valve 5 , a first temperature sensor 9 , a second temperature sensor 10 and a first chiller unit 15 ;

The connection between the hydrogen compressor 14 and the first cold water unit is as follows:

The water outlet of the hydrogen compressor 14 is connected to the second temperature sensor 10 and one end of the fifth water valve 5 , and the other end of the fifth water valve 5 is connected to the water inlet of the first chiller 15 . connect;

The water inlet of the hydrogen compressor 14 is connected to the first temperature sensor 9 and one end of the fourth water valve 4 , and the other end of the fourth water valve 4 is connected to the water outlet of the first chiller 15 . connect.

In this embodiment, the first chiller unit 15 includes: a first frequency converter, a first chiller compressor, a first cooling fan, a first controller, and a first guide vane;

The first controller is electrically connected to the first temperature sensor 9, the second temperature sensor 10, the first frequency converter and the first guide vane, and the frequency converter is electrically connected to the first The cold water compressor is electrically connected, and the first cold water compressor is electrically connected to the first cooling fan;

In the specific implementation, the first cold water compressor drives the impeller of the first cooling fan to rotate at a high speed through the speed-increasing gear, and the centrifugal force of the high-speed rotation of the impeller compresses the refrigerant gas and converts most of the kinetic energy of the gas into pressure energy; obviously , the energy obtained by the refrigerant gas from the impeller is finally input through the motor, and the input power of the motor satisfies the following relationship:

P=KDV/n

Among them, P is the input power of the motor, D is the full pressure of the refrigerant gas, V is the volume flow of the refrigerant gas, n is the motor efficiency, and K is the calculation constant;

In the above formula, D is proportional to the square of the speed of the motor, and V is proportional to the speed of the motor. From this, it can be obtained that the power of the motor is proportional to the cube of the speed of the motor, that is, reducing the speed will greatly reduce the power and improve the first speed. The efficiency of the first chiller compressor reduces the power consumption of the first chiller unit 15; the first frequency converter optimizes the speed of the motor and the first guide vane according to the outlet water temperature of the first chiller unit 15 and the pressure head of the first chiller compressor. The opening degree of the first chiller unit 15 is always in the optimal state area; the basic parameter controlled by the first frequency converter is the temperature difference between the actual value of the cold water outlet temperature and the set value; when the first chiller unit 15 is at full load When running under normal conditions, the first guide vane is fully opened, and the motor completes the temperature difference control according to the speed logic. As the load decreases, the motor speed will decrease, and it will be controlled by the head of the first cold water compressor and the minimum allowable speed of the system. Motor until the speed reaches the minimum; at this time, the motor will keep at the minimum speed, and the motor speed will provide a signal to the control of the first guide vane to reduce the opening of the guide vane; as the load continues Down, the rotational speed signal from the first cold water compressor continues to close the first guide vane, and further reduces the rotational speed of the motor.

In this embodiment, the second chiller unit includes: a sixth water valve 6 , a seventh water valve 7 , a third temperature sensor 11 , a fourth temperature sensor 12 and a second chiller unit 18 ;

The hydrogen outlet of the hydrogen compressor 14 is connected to the air inlet of the heat exchanger 17, and the heat exchanger 17 is connected to the second cold water unit, specifically:

The hydrogen outlet of the hydrogen compressor 14 is connected to one end of the third air valve 3, and the other end of the third air valve 3 is connected to the air inlet of the heat exchanger 17;

The water outlet of the heat exchanger 17 is connected to the fourth temperature sensor 12 and one end of the seventh water valve 7 , and the other end of the seventh water valve 7 is connected to the water inlet of the second chiller 18 connect;

The water inlet of the heat exchanger 17 is connected to the third temperature sensor 11 and one end of the sixth water valve 6 , and the other end of the sixth water valve 6 is connected to the water outlet of the second chiller 18 . connect.

In this embodiment, the second chiller unit 18 includes: a second frequency converter, a second chiller compressor, a second cooling fan, a second controller, and a second guide vane;

The second controller is electrically connected to the third temperature sensor 11, the fourth temperature sensor 12, the second frequency converter and the second guide vane, and the frequency converter is electrically connected to the second The cold water compressor is electrically connected, and the second cold water compressor is electrically connected to the second cooling fan;

In specific implementation, the working principle of the second chiller unit 18 is the same as that of the first chiller unit 15 .

In this embodiment, the connection between the air outlet of the heat exchanger 17 and the air inlet of the hydrogenation machine 19 is as follows:

The air outlet of the heat exchanger 17 is connected to one end of the eighth air valve 8 , and the other end of the eighth air valve 8 is connected to the air inlet of the hydrogenation machine 19 .

The present invention provides an energy-saving method for a chiller controlled by a frequency converter, which is realized based on the above-mentioned frequency-converter-controlled energy-saving system for a water chiller, and includes the steps:

S1: Start the chiller energy-saving system controlled by the inverter, set the load range of the first guide vanes in the first chiller 15 and the second guide vanes in the second chiller 18 load range;

S2: The first temperature sensor 9 detects the temperature T ₁ of the water outlet of the first chiller 15 in real time, and the second temperature sensor 10 detects the temperature T ₂ of the inlet water of the first chiller 15 in real time; The three temperature sensors 11 detect the outlet water temperature T ₃ of the second chiller 18 in real time, and the fourth temperature sensor 12 detects the inlet water temperature T ₄ of the second chiller 18 in real time;

S3: Adjust the operation of the first chiller unit 15 according to the load range of the first guide vane, the outlet water temperature T1 of the first chiller unit ₁₅ and the inlet water temperature T2 of the first chiller unit ₁₅ state; according to the load range of the second guide vane, the outlet water temperature T3 of the second chiller 18 and the inlet water temperature T4 _of the second chiller ₁₈ to adjust the work of the second chiller 18 state.

In this embodiment, step S3 is specifically:

S31: If the load range of the first guide vane is 70% to 100%, the first guide vane is fully opened; if the load range of the first guide vane is lower than 70%, the first guide vane is A guide vane starts to close, when the load range of the first guide vane is 50%, the first guide vane is fully closed; if the load range of the first guide vane is lower than 50%, it is To avoid surge, the first cold water compressor starts to increase power, and when the load range of the first guide vane is 20%, the first cold water compressor increases to a maximum of 130%, which can effectively increase the first cold water compressor. an operating range of the chiller 15;

If the value of the outlet water temperature T ₁ minus the inlet water temperature T ₂ is greater than the preset value T ₅ , the first cold water compressor is adjusted to work at 150% of the current operating power, otherwise the first cold water compressor _The machine works according to the current operating power; the preset value T5 can be set according to the actual situation;

S32: If the load range of the second guide vane is 70% to 100%, the second guide vane is fully opened; if the load range of the second guide vane is lower than 70%, the second guide vane is The second guide vanes begin to close, and when the load range of the second guide vane is 50%, the second guide vane is fully closed; if the load range of the second guide vane is lower than 50%, it is To avoid surge, the second cold water compressor starts to increase power, and when the load range of the second guide vane is 20%, the second cold water compressor increases to a maximum of 130%, which can effectively increase the power of the second cold water compressor. The operating range of the secondary chiller 18;

If the value of the outlet water temperature T ₃ minus the inlet water temperature T ₄ is greater than the preset value T ₆ , the second cold water compressor is adjusted to work at 150% of the current operating power, otherwise the second cold water compressor The machine works according to the current operating power; the preset value _T6 can be set according to the actual situation.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or system comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, method, article or system. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article or system that includes the element.

The above-mentioned serial numbers of the embodiments of the present invention are only for description, and do not represent the advantages or disadvantages of the embodiments. In a unit claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, and third, etc. do not denote any order, and these words may be construed as identifications.

The above are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields , are similarly included in the scope of patent protection of the present invention.

Claims (9)

1. An energy-saving system for a chiller controlled by a frequency converter, characterized in that it comprises: an air supply unit (13), a hydrogen compressor (14), a first chiller unit, a second chiller unit, a heat exchanger (17), A hydrogenation machine (19), a venting unit (16) and a hydrogenation vehicle (20); The air supply unit (13) is connected to the hydrogen compressor (14), the hydrogen compressor (14) is connected to the first cold water unit, and the discharge port of the hydrogen compressor (14) is connected to the The first inlet of the venting unit (16) is connected, the hydrogen outlet of the hydrogen compressor (14) is connected with the air inlet of the heat exchanger (17), and the heat exchanger (17) is connected to the second The cold water unit is connected, the air outlet of the heat exchanger (17) is connected to the air inlet of the hydrogenation machine (19), and the filling port of the hydrogenation machine (19) is connected to the hydrogenation vehicle (20). ) is connected, and the venting port of the hydrogenation machine (19) is connected to the second inlet of the venting unit (16). 2. The energy-saving system for a chiller controlled by a frequency converter according to claim 1, wherein the connection between the air supply unit (13) and the hydrogen compressor (14) is as follows: The nitrogen outlet of the gas supply unit (13) is connected with one end of the first gas valve (1), and the other end of the first gas valve (1) is connected with the nitrogen inlet of the hydrogen compressor (14); The hydrogen outlet of the gas supply unit (13) is connected to one end of the second gas valve (2), and the other end of the second gas valve (2) is connected to the hydrogen inlet of the hydrogen compressor (14). 3 . The energy-saving system for a chiller controlled by an inverter according to claim 1 , wherein the first chilled water unit comprises: a fourth water valve (4), a fifth water valve (5), and a first temperature sensor. 4 . (9), a second temperature sensor (10) and a first chiller (15); The connection between the hydrogen compressor (14) and the first cold water unit is specifically: The water outlet of the hydrogen compressor (14) is connected to the second temperature sensor (10) and one end of the fifth water valve (5), and the other end of the fifth water valve (5) is connected to the The water inlet of the first chiller unit (15) is connected; The water inlet of the hydrogen compressor (14) is connected to the first temperature sensor (9) and one end of the fourth water valve (4), and the other end of the fourth water valve (4) is connected to the The water outlet of the first chiller unit (15) is connected. 4. The energy-saving system for a chiller controlled by an inverter according to claim 3, wherein the first chiller unit (15) comprises: a first inverter, a first chiller compressor, a first cooling fan, a first chiller a controller and a first guide vane; The first controller is electrically connected to the first temperature sensor (9), the second temperature sensor (10), the first frequency converter and the first guide vane, and the frequency converter is connected to The first cold water compressor is electrically connected, and the first cold water compressor is electrically connected to the first cooling fan. 5 . The energy-saving system for a chiller controlled by a frequency converter according to claim 1 , wherein the second chilled water unit comprises: a sixth water valve (6), a seventh water valve (7), and a third temperature sensor. 6 . (11), a fourth temperature sensor (12) and a second chiller (18); The hydrogen outlet of the hydrogen compressor (14) is connected to the air inlet of the heat exchanger (17), and the heat exchanger (17) is connected to the second cold water unit, specifically: The hydrogen outlet of the hydrogen compressor (14) is connected to one end of the third air valve (3), and the other end of the third air valve (3) is connected to the air inlet of the heat exchanger (17); The water outlet of the heat exchanger (17) is connected to the fourth temperature sensor (12) and one end of the seventh water valve (7), and the other end of the seventh water valve (7) is connected to the The water inlet of the second chiller unit (18) is connected; The water inlet of the heat exchanger (17) is connected to the third temperature sensor (11) and one end of the sixth water valve (6), and the other end of the sixth water valve (6) is connected to the The water outlet of the second chiller unit (18) is connected. 6. The energy-saving system for a chiller controlled by an inverter according to claim 5, wherein the second chiller (18) comprises: a second inverter, a second chiller compressor, a second cooling fan, a second chiller two controllers and a second guide vane; The second controller is electrically connected to the third temperature sensor (11), the fourth temperature sensor (12), the second frequency converter and the second guide vane, and the frequency converter is connected to The second cold water compressor is electrically connected, and the second cold water compressor is electrically connected to the second cooling fan. 7. The energy-saving system for a chiller controlled by a frequency converter according to claim 1, wherein the connection between the air outlet of the heat exchanger (17) and the air inlet of the hydrogenation machine (19) is as follows: The air outlet of the heat exchanger (17) is connected to one end of the eighth air valve (8), and the other end of the eighth air valve (8) is connected to the air inlet of the hydrogenation machine (19). 8. An energy-saving method for a chiller controlled by a frequency converter, implemented based on the energy-saving system for a water chiller controlled by a frequency converter according to any one of claims 1-7, wherein the method comprises the steps of: S1: Start the chiller energy-saving system controlled by the inverter, set the load range of the first guide vane in the first chiller (15), and set the load range of the first guide vane in the first chiller (15), and the second chiller in the second chiller (18). The load range of the second guide vane; S2: The first temperature sensor (9) detects the outlet water temperature T ₁ of the first chiller (15) in real time, and the second temperature sensor (10) detects the inlet water temperature of the first chiller (15) in real time. Water temperature T ₂ ; the third temperature sensor ( 11 ) detects the outlet water temperature T ₃ of the second chiller ( 18 ) in real time, and the fourth temperature sensor ( 12 ) detects the second chiller ( 18 ) in real time ) inlet water temperature T ₄ ; S3: Adjust the first cold water according to the load range of the first guide vane, the outlet water temperature T1 of the first chiller unit ( ₁₅ ) and the inlet water temperature T2 of the _first chiller unit (15) The working state of the unit (15); according to the load range of the second guide vane, the outlet water temperature T3 of the second chiller unit (18) and the inlet water temperature T4 _of the second chiller unit ( ₁₈ ) The working state of the second chiller unit (18) is adjusted. 9. The energy-saving method for a chiller controlled by a frequency converter according to claim 8, wherein step S3 is specifically: S31: If the load range of the first guide vane is 70% to 100%, the first guide vane is fully opened; if the load range of the first guide vane is lower than 70%, the first guide vane is A guide vane begins to close, when the load range of the first guide vane is 50%, the first guide vane is fully closed; if the load range of the first guide vane is lower than 50%, the The first cold water compressor starts to increase power, and when the load range of the first guide vane is 20%, the first cold water compressor increases to a maximum of 130%; If the value of the outlet water temperature T ₁ minus the inlet water temperature T ₂ is greater than the preset value T ₅ , the first cold water compressor is adjusted to work at 150% of the current operating power, otherwise the first cold water compressor The machine works according to the current operating power; S32: If the load range of the second guide vane is 70% to 100%, the second guide vane is fully opened; if the load range of the second guide vane is lower than 70%, the second guide vane is The second guide vane begins to close, and the second guide vane is fully closed when the load range of the second guide vane is 50%; if the load range of the second guide vane is lower than 50%, the second guide vane is fully closed. The second cold water compressor starts to increase power, and when the load range of the second guide vane is 20%, the second cold water compressor increases to a maximum of 130%; If the value of the outlet water temperature T ₃ minus the inlet water temperature T ₄ is greater than the preset value T ₆ , the second cold water compressor is adjusted to work at 150% of the current operating power, otherwise the second cold water compressor The machine works according to the current operating power.

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