Air-water two-stage temperature control system and method for constant-temperature air conditioner

Abstract

The air and water two-stage temperature control system comprises a constant temperature chamber, an indoor air temperature control system and an air conditioner water supply temperature control system, and the indoor air temperature control system comprises a cooling coil and an electric heater which are sequentially communicated through an air duct. The air temperature sensor, the air temperature PID controller and the electric heater are sequentially connected through a circuit, the air conditioner water supply temperature control system comprises a water chilling unit and a heat exchange unit which are sequentially connected through a water pipe, and the air conditioner water supply temperature control system is connected with the indoor air temperature control system through a cooling coil. The air conditioner water supply temperature sensor, the air conditioner water supply temperature PID controller and the electric two-way regulating valve are sequentially connected through a circuit. Compared with the prior art, high-precision control over air conditioner water supply is achieved, the capacity of eliminating chilled water side disturbance is improved, and the advantage that the chilled water supply flow can be adjusted is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a constant temperature air conditioning feng shui two-stage temperature control system and method. Background Art

[0002] Industries such as the semiconductor industry and high-energy physics research require that the indoor environment has a high air stability, and the temperature fluctuation (ΔT) often needs to reach the high-precision level (-0.5°C ≤ ΔT ≤ 0.5°C) or even the ultra-high-precision level (-0.1°C ≤ ΔT ≤ 0.1°C). For constant temperature rooms of high-precision level and below, the current main temperature control method is to achieve temperature control by setting a separate cold and heat source and adjusting the terminal electric heating power of the air conditioning processing unit (AHU). However, when the temperature control requirements are raised to the ultra-high precision level or even higher, especially when facing large-capacity building objects such as high-end manufacturing workshops and superconducting accelerators, it is no longer possible to meet the temperature control needs by simply adjusting the reheating of the end of the blower. It is necessary to control the air conditioning water supply entering the cooling coil to effectively reduce the impact of external environmental disturbances on the constant temperature air conditioning. The current method of controlling air conditioning chilled water still mainly relies on adjusting the working parameters of the chiller compressor to achieve the outlet water temperature control of the chiller. However, this control method cannot achieve higher temperature control accuracy, and its ability to overcome disturbances on the chilled water system side is also very limited, which restricts the further improvement of the temperature control ability of the constant temperature air conditioner. Therefore, in order to solve the above problems, it is necessary to provide a constant temperature air conditioner Fengshui two-level temperature control system. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a constant temperature air conditioning feng shui two-stage temperature control system and method that can achieve constant temperature control of constant temperature air conditioning chilled water and indoor air supply and rapid removal of indoor and outdoor disturbances.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] According to one aspect of the present invention, a constant temperature air conditioning wind and water two-stage temperature control system is provided, comprising a constant temperature room, an indoor air temperature control system and an air conditioning water supply temperature control system, wherein the indoor air temperature control system comprises a cooling coil and an electric heater which are sequentially connected through an air duct, and an air temperature sensor, an air temperature PID controller and an electric heater which are sequentially connected through a circuit, wherein the air temperature sensor is located in the constant temperature room, and the air duct is connected to the constant temperature room;

[0006] The air conditioning water supply temperature control system includes a chiller, an electric two-way regulating valve, an air conditioning water supply temperature PID controller, an air conditioning water supply temperature sensor and a heat exchange unit. The chiller, the electric two-way regulating valve, the heat exchange unit and the cooling coil are connected in sequence through pipelines;

[0007] The air conditioning water supply temperature PID controller and the air conditioning water supply temperature sensor are connected in series, and the sensing end of the air conditioning water supply temperature sensor is located in the pipeline between the heat exchange unit and the cooling coil. The air conditioning water supply temperature PID controller is connected to the electric two-way regulating valve through a circuit.

[0008] Furthermore, the air-conditioning water supply temperature control system also includes an air-conditioning water supply pump, and the air-conditioning water supply pump is located between the heat exchange unit and the air-conditioning water supply temperature sensor.

[0009] Furthermore, the heat exchange unit includes a plate heat exchanger, which is provided with a cold side inlet, a cold side outlet, a hot side inlet and a hot side outlet. A second butterfly valve is provided at the hot side inlet and connected to the cooling coil, a third butterfly valve is provided at the cold side inlet and connected to the water outlet of the chiller, and a fourth butterfly valve is provided at the hot side outlet and connected to the air conditioning water supply pump.

[0010] Furthermore, the heat exchange unit also includes a water make-up branch, which includes a constant pressure water tank, a float valve and a first butterfly valve. The float valve is located inside the constant pressure water tank. The constant pressure water tank is connected to the water make-up pipe and the first butterfly valve. The first butterfly valve is connected to the pipeline of the air conditioning water supply temperature control system, and the connection point is located between the fourth butterfly valve and the air conditioning water supply pump.

[0011] Furthermore, the heat exchange unit includes a mixing valve, which is provided with a cold side inlet, a hot side inlet and an outlet. The cold side inlet is connected to the water outlet of the chiller, the hot side inlet is connected to the cooling coil, and the outlet is connected to the return water outlet of the chiller and the cooling coil.

[0012] Furthermore, bypass branches are connected in parallel at both ends of the cooling coil, and the bypass branch is provided with an electric three-way regulating valve, which connects the cooling coil, the bypass branch and the pipeline where the air conditioning water supply pump is located.

[0013] Furthermore, the air conditioning water supply temperature control system also includes a chilled water circulation pump, which is located at the return water inlet of the chiller.

[0014] Furthermore, the indoor air temperature control system also includes an air supply fan, which is located in an air duct connected to the constant temperature room.

[0015] According to another aspect of the present invention, a control method for a constant temperature air conditioning fengshui two-stage temperature control system is provided, the method being a method for eliminating indoor air side disturbance, comprising:

[0016] Detect abnormal indoor temperature signals through air temperature sensors;

[0017] Feedback abnormal temperature signal to air temperature PID controller;

[0018] The air temperature PID controller will make a difference between the received temperature abnormality signal and the set value, and then the deviation signal will be output as a control signal through PID calculation and transmitted to the electric heater;

[0019] Change the output power of the electric heater and adjust the supply air temperature so that the indoor air temperature stabilizes to the set value.

[0020] Furthermore, a method for eliminating outdoor air side disturbance is provided, comprising:

[0021] Detecting the chilled water temperature deviation signal through the air conditioning water supply temperature sensor;

[0022] Feedback the air conditioning water supply temperature signal to the air conditioning water supply temperature PID controller;

[0023] The air conditioner water supply temperature PID controller will subtract the received temperature abnormality signal from the set value and output the control signal through PID calculation and transmit it to the electric two-way regulating valve;

[0024] The flow rate of the fluid involved in heat exchange is adjusted by an electric two-way regulating valve, thereby changing the heat exchange amount of the air conditioning supply and return water to adjust the water supply temperature.

[0025] Compared with the prior art, the present invention has achieved the following technical effects:

[0026] 1. Based on the use of electric heating to adjust the air supply temperature, the present invention adds an air conditioning water supply temperature control system, which further enhances the heat exchange stability of the cooling coil and the air circulation system, thereby achieving an improvement in the air temperature control accuracy in the constant temperature room.

[0027] 2. The present invention constructs a two-level control system of wind and water, which can achieve the design effect of eliminating the internal disturbance of the constant temperature room by using the air supply temperature control system based on electric heating, and eliminating the external disturbance (chilled water unit, weather changes, etc.) by using the air conditioning water supply temperature control system. Compared with the existing technology, the ability to eliminate the system disturbance on the chilled water side is significantly improved.

[0028] 3. The present invention adds a chilled water control system based on flow control, thereby expanding the system control margin without increasing the electric heating power and thus generating additional energy consumption. When the degree of a single disturbance is large, control can be achieved by relying on both the air temperature control system and the air conditioning water supply temperature control system, thereby increasing the disturbance resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a system connection diagram of an embodiment of a constant temperature air conditioning fengshui two-stage temperature control system based on a plate heat exchanger;

[0030] Figure 2A system connection diagram of an embodiment of a two-stage temperature control system for constant temperature air conditioning and fengshui based on a water mixing pump

[0031] Figure 3 A control flow for realizing internal disturbance elimination in the present invention;

[0032] Figure 4 A control process for realizing external disturbance elimination in the present invention;

[0033] Explanation of the reference numerals in the accompanying drawings: 1. Chiller; 2. Chilled water circulation pump; 3. Electric two-way regulating valve; 4. Air conditioning water supply temperature PID controller; 5. Constant pressure water tank; 6. Float valve; 7. First butterfly valve; 8. Air conditioning water supply pump; 9. Air conditioning water supply temperature sensor; 10. Electric three-way regulating valve; 11. Electric heater; 12. Constant temperature room; 13. Air temperature PID controller; 14. Air temperature sensor; 15. Air supply fan; 16. Cooling coil; 17. Second butterfly valve 2; 18. Plate heat exchanger; 19. Third butterfly valve; 20. Fourth butterfly valve; 21. Mixing valve. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0035] The technical idea of ​​the present invention is as follows: on the basis of using electric heating to adjust the air supply temperature, an air-conditioning water supply temperature control system is added, and the air-conditioning water supply and low-temperature chilled water heat exchange are adjusted through a PID-based closed-loop control system to achieve high-precision control of the air-conditioning water supply, thereby constructing a two-stage temperature control system for the air supply system and the air-conditioning water supply, thereby improving the ability to eliminate the side disturbance of the chilled water, and at the same time using a digital flow meter, an electric three-way regulating valve and a bypass circuit to achieve control of the chilled water supply flow.

[0036] The indoor air temperature control system uses a fan as a power device to drive the indoor return air to be cooled by the cooling coil and then heated by the electric heater, and then sent to the constant temperature room. The indoor air temperature sensor 14 collects indoor air temperature data in real time and feeds it back to the indoor air temperature PID controller 13. The indoor air temperature PID controller 13 performs PID calculation according to the set value and outputs the control signal to the electric heater 11 as an actuator. The electric heater 11 changes the heating power, thereby adjusting the indoor air temperature by adjusting the supply air temperature.

[0037] The function of the air conditioning water supply temperature control system is to deliver air conditioning water supply with stable temperature to the cooling coil 16 in the indoor air temperature control system. The chiller 1 inputs low-temperature water into the system from the water outlet, and returns to the chiller 1 from the return water outlet after heat exchange. The system uses the low-temperature frozen water generated by the input chiller 1 and the higher-temperature air conditioning return water returned by the cooling coil 16 for heat exchange, thereby supplying air conditioning water supply with a temperature that meets the requirements to the cooling coil 1. The air conditioning water supply temperature sensor 9 collects the air conditioning water supply temperature in real time and feeds it back to the air conditioning water supply temperature PID controller 4. The controller outputs a control signal to the corresponding actuator (generally an electric two-way regulating valve 3) according to the set value. The actuator adjusts the heat exchange amount of the air conditioning supply and return water by adjusting the flow rate of the fluid involved in the heat exchange, and further adjusts the air conditioning water supply temperature, so that the air conditioning water supply temperature is stable at the set value.

[0038] During operation, the indoor air temperature control system adjusts the supply air temperature to overcome the internal heat source disturbance, and the air conditioning water supply temperature control system overcomes the external disturbance from the chilled water system, delivering air conditioning water with stable temperature to the cooling coil 16. The combination of the two constitutes a constant temperature air conditioning wind and water two-stage temperature control system.

[0039] Example 1

[0040] like Figure 1 As shown, this embodiment is a two-stage temperature control system for constant temperature air conditioning and feng shui based on a plate heat exchanger, which is deployed in a constant temperature room 12 to achieve an air temperature regulation control system for constant indoor air temperature.

[0041] The plate heat exchanger 18 is the core component of this system. Its cold side inputs the low-temperature chilled water output by the chiller, and outputs the chilled water after heat exchange back to the chiller 1 (or cold water tank). Its hot side inputs the air-conditioning return water returned by the cooling coil 16, and outputs the air-conditioning supply water after being cooled by the chilled water, thereby removing indoor heat.

[0042] The chilled water circulation pump 2 is located between the cold side outlet of the plate heat exchanger 18 and the chiller to realize the circulation of the cold side fluid; the air conditioning water supply pump 8 is located between the hot side outlet of the plate heat exchanger 18 and the cooling coil 16 to realize the circulation of the air conditioning supply and return water; the air conditioning water supply temperature sensor 9 is located between the air conditioning water supply pump 8 and the cooling coil 16 to collect the air conditioning water supply temperature signal to realize temperature control; the air conditioning water supply temperature PID controller 4 receives the temperature signal collected by the air conditioning water supply temperature sensor 9, compares it with the set value, and outputs a control signal; the electric two-way regulating valve 3 is located at the cold side outlet of the plate heat exchanger 18 to receive the control signal output by the air conditioning water supply temperature PID controller 4 to change the valve opening to adjust the chilled water flow entering the plate heat exchanger, thereby realizing the temperature control of the hot side air conditioning water supply.

[0043] As a preferred embodiment, the system is provided with a water replenishment branch. Among them, the constant pressure water tank 5 is located before the air conditioning water supply pump 8, which is used for constant pressure before the pump and water replenishment in the pipeline; the float valve 6 is located inside the constant pressure water tank 5, which is used to maintain a constant water level inside the constant pressure water tank 5; the first butterfly valve 7 is located in the water replenishment branch, which is used to adjust the water replenishment flow; the second butterfly valve 17, the third butterfly valve 19, and the fourth butterfly valve 20 are respectively located at the hot side inlet, the cold side inlet, and the hot side outlet of the plate heat exchanger 18, which are used to facilitate the disassembly of the equipment.

[0044] The electric three-way regulating valve 10 is located in the bypass branch parallel to the AHU water supply branch, and is used to adjust the bypass flow and thus adjust the air-conditioning water supply flow entering the cooling coil 16; the water pipe and the pipeline tee are used to connect the water circuit.

[0045] As a preferred embodiment, heat-insulating cotton is wrapped on the pipeline to isolate the system from the influence of ambient temperature; the air temperature sensor 14 is located inside the constant temperature room 12 to collect the real-time air temperature in the constant temperature room 12.

[0046] The air temperature PID controller 13 is used to receive the temperature signal collected by the air temperature sensor 14 and compare it with the set value, and output a control signal; the electric heater 11 is located after the air supply fan 15, and is used to receive the control signal output by the air temperature PID controller 13, so as to adjust the heating power to achieve indoor temperature regulation; the air supply fan 15 is used to provide power for air circulation heat exchange; the cooling coil 16 is located after the air conditioning water supply temperature sensor 14, and uses the air conditioning water supply to cool the circulating air.

[0047] When in use, in the operating state, the operator first sets the air temperature setting value and the air conditioning water supply temperature setting value in the constant temperature room 12 according to the process requirements, then turns on the circulation pump and the corresponding valve in the system, and uses the electric three-way regulating valve 10 and the bypass loop to realize the system flow regulation according to the process requirements, and then collects the indoor air temperature signal in real time through the air temperature sensor 14, feeds the air temperature signal back to the air temperature PID controller 13, makes a difference with the setting value, and outputs the control signal through PID operation and transmits it to the electric heater 11 power conversion device, adjusts the power of the electric heater 11 to realize the indoor air temperature regulation; at the same time, the air conditioning water supply temperature is collected in real time through the air conditioning water supply temperature sensor 9, feeds the air conditioning water supply temperature signal back to the air conditioning water supply temperature PID controller 13, makes a difference with the setting value, and outputs the control signal through PID operation and transmits it to the electric two-way regulating valve 3, and the electric two-way regulating valve 3 receives the control signal and changes the valve opening to adjust the cold side flow of the plate heat exchanger 18, so as to realize the regulation of the air conditioning water supply temperature. By using the above means, the air temperature in the constant temperature room and the air conditioning water supply temperature can be guaranteed to be stable at the same time. At the same time, the constant pressure water tank 5 can stabilize the pressure before the water supply circulation pump so as to make the system operation flow more stable.

[0048] The present embodiment provides a constant temperature air conditioning feng shui two-stage temperature control system based on a plate heat exchanger, which can simultaneously realize constant temperature control of indoor air temperature and air conditioning water supply temperature, and has a good effect of eliminating indoor air side disturbances and external chilled water system side disturbances, and can further improve the air temperature stability in the constant temperature room 12.

[0049] Example 2

[0050] like Figure 2 As shown, this embodiment is a system for realizing two-stage temperature control of constant temperature air conditioning and feng shui based on a mixing valve, which is deployed in a constant temperature room to realize an air temperature regulation control system for constant indoor air temperature.

[0051] The difference between this embodiment and the first embodiment is that the mixing valve 21 is the core component of the system, the cold side inlet on the left side in the figure inputs the low-temperature chilled water output by the chiller 1, the hot side inlet on the lower side in the figure inputs the air-conditioning return water returned by part of the cooling coil 16, and the outlet on the right side in the figure outputs the air-conditioning supply water after being cooled and mixed with the chilled water to the cooling coil 16, thereby realizing the removal of indoor heat; the chilled water circulation pump 2 is located between the mixing valve 21 and the chiller 1 to realize the supply of low-temperature chilled water; the air-conditioning supply water pump 8 is located between the mixing valve 21 and the cooling coil 16 to realize the circulation of air-conditioning supply and return water; the electric two-way regulating valve 3 is located between the air-conditioning return water and the chiller 1, and is used to receive the control signal output by the air-conditioning supply water temperature PID controller 4 to change the valve opening to adjust the air-conditioning return water flow directly returned to the chiller 1, thereby adjusting the air-conditioning return water flow entering the mixing valve 21, thereby realizing the temperature control of the air-conditioning supply water after mixing by the mixing valve 21.

[0052] When in use, in the operating state, the operator first sets the air temperature setting value and the air conditioning water supply temperature setting value in the constant temperature room 12 according to the process requirements, then turns on the circulation pump and the corresponding valve in the system, and uses the electric three-way regulating valve 10 and the bypass loop to realize the system flow regulation according to the process requirements, and then collects the indoor air temperature signal in real time through the air temperature sensor 14, feeds the air temperature signal back to the air temperature PID controller 13, makes a difference with the set value, and outputs the control signal through PID operation and transmits it to the electric heater 11 power conversion device, adjusts the power of the electric heater 11 to realize the indoor air temperature regulation; at the same time, the air conditioning water supply temperature is collected in real time through the air conditioning water supply temperature sensor 9, feeds the air conditioning water supply temperature signal back to the air conditioning water supply temperature PID controller 4, makes a difference with the set value, and outputs the control signal through PID operation and transmits it to the electric two-way regulating valve 3, and the electric two-way regulating valve 3 receives the control signal and changes the valve opening to adjust the mixing ratio of the cold and hot fluids in the mixing valve 21, so as to realize the regulation of the air conditioning water supply temperature. By using the above means, the air temperature and air conditioning water supply temperature in the constant temperature room 12 can be guaranteed to be stable at the same time.

[0053] The present embodiment provides a two-stage temperature control system for constant temperature air conditioning and feng shui based on a mixing valve, which can simultaneously realize constant temperature control of indoor air temperature and air conditioning water supply temperature, and has a good effect of eliminating indoor air side disturbances and external chilled water system side disturbances, and can further improve the air temperature stability in the constant temperature room 12.

[0054] Figure 3 The present invention shows the process of eliminating the indoor air disturbance. After the disturbance occurs, the air temperature sensor 14 first detects the temperature abnormality and feeds back the temperature signal to the air temperature PID controller 13, which further outputs the heating power of the electric heater 11 and adjusts the air supply temperature so that the indoor air temperature can be stabilized to the set value. The present invention uses electric heating control based on a closed-loop control circuit to achieve rapid elimination of indoor air disturbance.

[0055] Figure 4 The present invention shows the process of eliminating disturbances in the outdoor chilled water system. After the disturbance occurs, the air-conditioning water supply temperature sensor 9 detects the temperature deviation, and feeds back the air-conditioning water supply temperature signal to the air-conditioning water supply temperature PID controller 4, and further outputs a control signal to the electric two-way regulating valve 3 to adjust the corresponding fluid flow rate involved in the heat exchange, and further adjusts the water supply temperature by changing the air-conditioning supply and return water heat exchange amount. In this process, due to the inertia of the indoor air temperature, the indoor air temperature sensor 14 will also produce deviations after the air-conditioning water supply temperature control system is activated, and drive the indoor air temperature PID controller 13 and the electric heater 11 to act synchronously. Finally, under the synergistic effect of the two-stage temperature control system, the external chilled water side disturbance can be quickly eliminated.

[0056] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A constant temperature air conditioning feng shui two-stage temperature control system, characterized in that: The invention comprises a constant temperature room (12), an indoor air temperature control system and an air conditioning water supply temperature control system, wherein the indoor air temperature control system comprises a cooling coil (16) and an electric heater (11) which are sequentially connected through an air duct, and an air temperature sensor (14), an air temperature PID controller (13) and the electric heater (11) which are sequentially connected through a circuit, wherein the air temperature sensor (14) is located in the constant temperature room (12), and the air duct is connected to the constant temperature room (12); The air conditioning water supply temperature control system comprises a water chiller (1), an electric two-way regulating valve (3), an air conditioning water supply temperature PID controller (4), an air conditioning water supply temperature sensor (9) and a heat exchange unit, wherein the water chiller (1), the electric two-way regulating valve (3), the heat exchange unit and the cooling coil (16) are connected in sequence through pipelines; The air conditioning water supply temperature PID controller (4) and the air conditioning water supply temperature sensor (9) are connected in series, and the sensing end of the air conditioning water supply temperature sensor (9) is located in the pipeline between the heat exchange unit and the cooling coil (16), and the air conditioning water supply temperature PID controller (4) is connected to the electric two-way regulating valve (3) through a circuit.

2. A constant temperature air conditioning feng shui two-stage temperature control system according to claim 1, characterized in that: The air-conditioning water supply temperature control system further comprises an air-conditioning water supply pump (8), wherein the air-conditioning water supply pump (8) is located between the heat exchange unit and the air-conditioning water supply temperature sensor (9).

3. A constant temperature air conditioning feng shui two-stage temperature control system according to claim 2, characterized in that: The heat exchange unit comprises a plate heat exchanger (18), the plate heat exchanger (18) being provided with a cold side inlet, a cold side outlet, a hot side inlet and a hot side outlet, the hot side inlet being provided with a second butterfly valve (17) and connected to a cooling coil (16), the cold side inlet being provided with a third butterfly valve (19) and connected to a water outlet of a chiller (1), and the hot side outlet being provided with a fourth butterfly valve (20) and connected to an air conditioning water supply pump (8).

4. A constant temperature air conditioning feng shui two-stage temperature control system according to claim 3, characterized in that: The heat exchange unit further comprises a water replenishment branch, the water replenishment branch comprising a constant pressure water tank (5), a float valve (6) and a first butterfly valve (7), the float valve (6) being located inside the constant pressure water tank (5), the constant pressure water tank (5) being connected to a water replenishment pipeline and the first butterfly valve (7), the first butterfly valve (7) being connected to a pipeline of an air conditioning water supply temperature control system, and the connection point being located between the fourth butterfly valve (20) and the air conditioning water supply pump (8).

5. A constant temperature air conditioning feng shui two-stage temperature control system according to claim 2, characterized in that: The heat exchange unit comprises a water mixing valve (21), the water mixing valve (21) being provided with a cold side inlet, a hot side inlet and an outlet, the cold side inlet being connected to the water outlet of the chiller (1), the hot side inlet being connected to the cooling coil (16), and the outlet being connected to the return water inlet of the chiller (1) and the cooling coil (16).

6. A constant temperature air conditioning feng shui two-stage temperature control system according to claim 2, characterized in that: A bypass branch is connected in parallel at both ends of the cooling coil (16), and the bypass branch is provided with an electric three-way regulating valve (10). The electric three-way regulating valve (10) connects the cooling coil (16), the bypass branch and the pipeline where the air conditioning water supply pump (8) is located.

7. A constant temperature air conditioning feng shui two-stage temperature control system according to claim 1, characterized in that: The air-conditioning water supply temperature control system further comprises a chilled water circulation pump (2), and the chilled water circulation pump (2) is located at the water return port of the chiller (1).

8. A constant temperature air conditioning feng shui two-stage temperature control system according to claim 1, characterized in that: The indoor air temperature control system further comprises an air supply fan (15), wherein the air supply fan (15) is located in an air duct connected to the constant temperature room (12).

9. The control method of the constant temperature air conditioning feng shui two-stage temperature control system according to any one of claims 1 to 8, characterized in that: The method is a method for eliminating indoor air side disturbance, comprising: Detecting an abnormal indoor temperature signal through an air temperature sensor (14); Feedback the abnormal temperature signal to the air temperature PID controller (13); The received temperature abnormality signal is subtracted from the set value by the air temperature PID controller (13), and the deviation signal is output as a control signal through PID calculation and transmitted to the electric heater (11); The output power of the electric heater (11) is changed to adjust the air supply temperature so that the indoor air temperature is stabilized to a set value.

10. The control method of a constant temperature air conditioning feng shui two-stage temperature control system according to claim 9, characterized in that: The method is a method for eliminating outdoor air side disturbance, comprising: Detecting a chilled water temperature deviation signal via an air conditioning water supply temperature sensor (9); Feeding back the air conditioning water supply temperature signal to the air conditioning water supply temperature PID controller (4); The received temperature abnormality signal is subtracted from the set value by the air-conditioning water supply temperature PID controller (4), and the deviation signal is output as a control signal through PID calculation and transmitted to the electric two-way regulating valve (3); The flow rate of the fluid involved in heat exchange is adjusted by an electric two-way regulating valve (3), thereby changing the heat exchange amount of the air-conditioning supply and return water to adjust the water supply temperature.

Images