Central air conditioner temperature control system based on multi-story building

Abstract

The utility model discloses a central air-conditioning temperature control system based on a multi-story building, which relates to the field of refrigerating systems and comprises a host, a freezing pump, a cold water pipeline and a fan coil unit. The main machine is connected with the freezing pump through a cold water pipeline, and the fan coil unit is connected with the freezing pump through a cold water pipeline and used for achieving air cooling. The system further comprises a controller, a temperature detection module and a cooling capacity adjusting module. The temperature detection module is used for detecting the room temperature to obtain temperature information. The controller can be in wireless communication with the host, the temperature detection module and the cooling capacity adjusting module so as to output a control signal to the cooling capacity adjusting module according to the outlet water temperature and the return water temperature of the host and the temperature information of the temperature detection module. The cooling capacity adjusting module adjusts the proportion of the amount of cold water input into the fan coil unit according to the control signal of the controller. According to the invention, the energy consumption of the host can be reduced while the cooling effect of each floor is ensured to be consistent.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration systems, in particular to a central air-conditioning temperature control system based on a multi-story building. Background Art

[0002] Central air conditioning generates heat during use. This heat will increase the indoor temperature and in turn act on the air conditioner, causing increased power and power consumption, so cooling is required.

[0003] The traditional method uses a single compressor to cool the entire floor with air conditioning. This will result in more water flow to the lower floors, which are close to the main unit, and less water flow to the higher floors, which are far from the main unit. The uneven cooling will cause the air conditioning to cool unbalanced. In order to ensure that the air conditioning has a consistent cooling effect on each floor, the main unit will increase its energy consumption.

[0004] Therefore, the existing technology still needs to be improved and developed. Utility Model Content

[0005] The technical problem to be solved by the present invention is that, in view of the above-mentioned defects of the prior art, a central air-conditioning temperature control system based on multi-story buildings is provided, aiming to solve the problem that the existing central air-conditioning based on multi-story buildings has uneven temperature control on each floor, thereby causing increased energy consumption of the host.

[0006] The present application provides a central air-conditioning temperature control system based on a multi-story building, which adopts the following technical solutions:

[0007] A central air-conditioning temperature control system based on a multi-story building, comprising:

[0008] Host, refrigeration pump, chilled water pipes and fan coil units;

[0009] The host is connected to the refrigeration pump via the cold water pipeline, and the fan coil unit is connected to the refrigeration pump via the cold water pipeline, so as to receive the cold energy of the host to realize air cooling;

[0010] It also includes: a controller, a temperature detection module and a cooling capacity adjustment module;

[0011] The temperature detection module is used to detect the room temperature to obtain a temperature signal; the controller can communicate wirelessly with the host, the temperature detection module and the cooling capacity adjustment module to output a control signal to the cooling capacity adjustment module according to the outlet water temperature and return water temperature of the host and the temperature signal of the temperature detection module;

[0012] The cooling capacity regulating module is connected to the cold water pipe and is located between the refrigeration pump and the fan coil unit. The cooling capacity regulating module adjusts the proportion of the cold water input to the fan coil unit according to the control signal of the controller.

[0013] Furthermore, the cooling capacity regulating module includes an electric valve, which is connected to the cold water pipeline and is used to control the proportion of cold water passing through according to the wireless control signal of the controller.

[0014] Furthermore, it also includes an SPI interface and a wireless communication module, one end of the SPI interface is connected to the electric valve, and the other end is connected to the wireless communication module, and the wireless communication module is used for signal transmission between the controller and the electric valve.

[0015] Furthermore, the IO end of the SPI interface is connected to the switch of the electric valve, the nHOLD end of the SPI interface is connected to the seventh pin of the wireless communication module, and the nWP end of the SPI interface is connected to the third pin of the wireless communication module.

[0016] Furthermore, the fan coil unit has a fan control module, and the fan control module can communicate wirelessly with the controller to control the air cooling rate of the fan coil unit according to the control signal of the controller.

[0017] Furthermore, the fan control module is a frequency converter.

[0018] Furthermore, the fan coil unit also includes a fan, a coil and a motor, the coil is connected to the refrigeration pump, the fan is connected to the motor and is located on one side of the coil; the inverter is connected to the motor and wirelessly communicates with the controller, and the inverter controls the rotation speed of the motor according to the wireless control signal of the controller, thereby controlling the air cooling rate of the fan coil unit.

[0019] Furthermore, the temperature detection module includes a temperature sensor.

[0020] Beneficial effects of the utility model: the application adds a temperature detection function and a cooling capacity adjustment function, and detects the indoor temperature through a temperature detection module to obtain the temperature of each room, so that the controller can more accurately control the cooling output to each room according to the indoor temperature, and then control the cooling capacity input to the fan coil unit in different proportions through the cooling capacity adjustment module, thereby ensuring the consistent cooling effect on each floor and reducing the energy consumption of the main unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a schematic diagram of the overall framework of a central air-conditioning temperature control system based on a multi-story building provided in an embodiment of the present application.

[0022] Figure 2 It is a flowchart of a central air-conditioning temperature control system based on a multi-story building provided in an embodiment of the present application.

[0023] Figure 3 It is a schematic diagram of the wireless communication provided in an embodiment of the present application.

[0024] Description of the drawings: 1. Host; 2. Controller; 3. Refrigeration pump; 4. Cold water pipe; 5. Fan coil unit; 6. Temperature detection module; 7. Cooling capacity adjustment module; 8. Fan control module. DETAILED DESCRIPTION

[0025] The present application discloses a central air conditioning temperature control system based on a multi-story building. In order to make the purpose, technical solution and effect of the present application clearer and more specific, the present application is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] like Figure 1 As shown, the embodiment of the present application discloses a central air-conditioning temperature control system based on a multi-story building, which includes: a host 1, a refrigeration pump 3, a cold water pipe 4 and a fan coil unit 5;

[0027] The host 1 is connected to the refrigeration pump 3 through a cold water pipe 4. The host 1 is used to generate cold energy, including cold water temperature and cold water volume, generally referring to the cold water temperature; the fan coil unit 5 is connected to the refrigeration pump 3 through a cold water pipe 4, and is used to receive the cold energy of the host 1 to realize indoor air cooling.

[0028] It also includes: a controller 2, a temperature detection module 6 and a cooling capacity adjustment module 7. The temperature detection module 6 is used to detect the room temperature to obtain temperature information and transmit the temperature information to the controller 2. The controller 2 can communicate wirelessly with the host 1, the refrigeration pump 3, the temperature detection module 6 and the cooling capacity adjustment module 7 to output a control signal to the cooling capacity adjustment module 7 according to the outlet water temperature and return water temperature of the host 1 and the indoor temperature information of the temperature detection module 6. The host 1 generates cooling capacity according to the control signal of the controller 2, and the refrigeration pump 3 outputs cold water according to the control signal of the controller 2. The cooling capacity adjustment module 7 is connected to the cold water pipeline 4 and is located between the refrigeration pump 3 and the fan coil unit 5. The cooling capacity adjustment module 7 adjusts the proportion of the cold water input to the fan coil unit 5 according to the control signal of the controller 2.

[0029] It should be noted that for multi-story buildings, the design should be as follows: each room is equipped with a temperature detection module 6, which can be a wireless temperature sensor; each floor is installed with a fan coil unit 5 and a corresponding cooling capacity adjustment module 7; each temperature detection module 6 and each cooling capacity adjustment module 7 can communicate wirelessly with the controller 2, so that the controller 2 can adjust the cooling capacity output according to the outlet water temperature and return water temperature of the host 1 and the indoor temperature.

[0030] In the specific implementation, the controller 2 controls the host 1 to generate cold water, and controls the refrigeration pump 3 to output cold water, and then the cold water passes through the fan coil unit 5 to cool the indoor air, thereby achieving a cooling effect. For multi-story buildings, usually the lower floors get more water, and the higher floors get less water, which causes the problem of unbalanced air conditioning cooling. In order to ensure the cooling effect of the air conditioner, the host 1 will increase the cold water, resulting in increased energy consumption. In addition, considering the difficulty of construction in actual applications and reducing the impact on customers during operation, all signal transmissions in this application adopt wireless network transmission.

[0031] Therefore, the present application adds a temperature detection function and a cooling capacity adjustment function, and detects the indoor temperature through the temperature detection module 6 to obtain the temperature of each room, so that the controller 2 can more accurately control the cooling output to each room according to the indoor temperature, and then control the cooling capacity input to the fan coil unit 5 in different proportions through the cooling capacity adjustment module 7, so as to ensure the consistent cooling effect on each floor and reduce the energy consumption of the host 1.

[0032] In some embodiments, the cooling capacity adjustment module 7 may include an electric valve, which is connected to the cold water pipe 4 and wirelessly communicates with the controller 2. The electric valve controls the proportion of cooling capacity input to the fan coil unit 5 according to the wireless control signal of the controller 2. During the initial control, the maximum flow principle is maintained. For example, if the cooling capacity ratio of the 1st floor, the 2nd floor, and the 3rd floor is 30%: 30%: 40%, then the opening of the corresponding valve should be 75%: 75%: 100%, and then the longest time is recorded according to the preset temperature value. For example, if the highest floor is the 3rd floor, then the response time of the third floor is the longest, generally 20 to 40 minutes.

[0033] In specific implementation, Figure 2As shown, by detecting the indoor temperature and the load of the host 1 (i.e., the number of fan coil units 5 connected), it is determined whether to increase the cooling capacity. If the indoor temperature is high, or the load of the host 1 increases, the host 1 increases its operation and lowers the outlet water temperature or increases the outlet water volume, or increases the frequency of the refrigeration pump 3 to increase the cooling capacity. Or the total cooling capacity remains unchanged, and the opening degree of the electric valve switch is controlled to increase the cooling capacity input. When the cooling capacity increases, the response time is recorded, and the temperature of the proximal floor and the temperature of the next proximal floor are detected to see whether they reach the lower limit of the temperature, and then the opening degree of the electric valve of the corresponding floor is adjusted, and then it is determined whether the farthest floor reaches the lower limit of the temperature or whether the response time reaches the preset value. If so, the valve setting is reset and the control process ends.

[0034] Specifically, it is first detected that the near-end floor (1st floor) has reached the lower temperature limit. At this time, the controller 2 controls the electric valve to reduce the opening to reduce the proportion of cold air passing through. The reduced proportion is the increased cold air proportion, and the proportion in the three floors is the proportion of the farthest floor. For example, the flow rate increases by 30%, and the farthest flow rate accounts for 40%, then the electric valve opening is reduced by 12%. It was 75% before adjustment and becomes 66% after adjustment.

[0035] Then it is detected that the next closest floor (2nd floor) has reached the lower temperature limit. At this time, controller 2 controls the electric valve to reduce the opening to reduce the proportion of cold air passing through. The reduced proportion is the increased cold air proportion, and the proportion in the three floors is the proportion of the farthest floor. For example, the flow increases by 30%, and the farthest flow accounts for 30%, then the electric valve opening is reduced by 9%. It was 75% before adjustment and became 68% after adjustment.

[0036] This cycle is repeated until the response time reaches the preset value or the temperature of the farthest floor (3rd floor) reaches the preset temperature lower limit. The adjustment is completed, and the flow distribution ratio and valve data are restored.

[0037] In some embodiments, the fan coil unit 5 includes a fan, a coil and a motor, the coil is connected to the refrigeration pump 3, the fan is connected to the motor and is located on one side of the coil, and the fan is used to achieve air cooling; in the present application, the fan coil unit 5 also has a fan control module 8, the fan control module 8 can be wirelessly connected to the controller 2, and the fan control module 8 controls the air cooling rate of the fan coil unit 5 according to the wireless control signal of the controller 2. Specifically, the fan control module 8 can use a frequency converter. In actual application, the frequency converter is electrically connected to the motor and the controller 2 respectively, and controls the rotation rate of the motor according to the control signal of the controller 2, so as to control the air cooling rate of the fan coil unit 5.

[0038] When the room temperature is not balanced, in addition to the above-mentioned method of adjusting the cooling capacity, the room temperature can also be lowered by adjusting the fan rotation speed to achieve a better adjustment effect on the room temperature. Specifically, the frequency converter controls the rotation speed of the motor through the control signal of the controller 2, and then controls the rotation speed of the fan, thereby adjusting the air cooling rate. The two methods are compatible and can achieve a better effect of room temperature regulation. The frequency converter soft-start motor can greatly reduce the impact current, reduce bearing wear, and extend the bearing life. It has low energy consumption and low noise, and can be well applied in the cooling control system.

[0039] In some embodiments, Figure 3 As shown, the temperature control system also includes an SPI interface CN1 and a wireless communication module U6. One end of the SPI interface CN1 is connected to the electric valve, and the other end is connected to the wireless communication module U6. The SPI interface CN1 and the wireless communication module U6 are similar to the form of a wireless network card. By inserting the SPI interface CN1 into the electric valve, the wireless communication of the electric valve can be realized, which is convenient for use. Specifically, the IO end of the SPI interface CN1 is connected to the switch of the electric valve, the nHOLD end of the SPI interface CN1 is connected to the seventh pin of the wireless communication module U6, and the nWP end of the SPI interface CN1 is connected to the third pin of the wireless communication module U6. The wireless communication module U6 is used for signal transmission between the controller 2 and the electric valve, including adjusting the opening signal of the electric valve and the frequency signal of the inverter, as well as the information of the cold distribution.

[0040] Compared with the prior art, the utility model has the following advantages:

[0041] 1. The cooling control principle of the central air conditioner is to control the host 1 to generate cold (related to the temperature or flow of cold water) through the controller 2, and control the refrigeration pump 3 to output the cold, and then the cold water passes through the fan coil unit 5 to cool the indoor air, thereby achieving a cooling effect. The present application adds a temperature detection function and a cold capacity adjustment function, and detects the indoor temperature through the temperature detection module 6 to obtain each indoor temperature, so that the controller 2 can control the cold output to each room according to the indoor temperature, and then control the cold input to the fan coil unit 5 in different proportions through the cold capacity adjustment module 7 and the refrigeration pump 3, so as to ensure that the cooling effect of each floor is consistent and reduce the energy consumption of the host 1.

[0042] 2. This application adds a fan control module 8 to adjust the air cooling rate of the fan, thereby combining the cooling capacity adjustment method to better achieve room temperature adjustment. And the frequency converter is used as the control module, the frequency converter can soft-start the motor, greatly reduce the impact current, reduce bearing wear, extend the life of the bearing, and has low energy consumption, low noise, and better application effect.

[0043] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A central air conditioning temperature control system based on a multi-story building, characterized in that: include: Host, refrigeration pump, chilled water pipes and fan coil units; The host is connected to the refrigeration pump via the cold water pipeline, and the fan coil unit is connected to the refrigeration pump via the cold water pipeline, so as to receive the cold energy of the host to realize air cooling; It also includes: a controller, a temperature detection module and a cooling capacity adjustment module; The temperature detection module is used to detect the room temperature to obtain temperature information; the controller can communicate wirelessly with the host, the temperature detection module and the cooling capacity adjustment module to output a control signal to the cooling capacity adjustment module according to the outlet water temperature and return water temperature of the host and the temperature information of the temperature detection module; The cooling capacity regulating module is connected to the cold water pipeline and is located between the refrigeration pump and the fan coil unit. The cooling capacity regulating module adjusts the proportion of the cold water input to the fan coil unit according to the control signal of the controller.

2. The central air conditioning temperature control system based on a multi-story building according to claim 1 is characterized in that: The cooling capacity regulating module comprises an electric valve, which is connected to the cold water pipeline and is used to control the proportion of cold water passing through according to the wireless control signal of the controller.

3. The central air conditioning temperature control system based on a multi-story building according to claim 2 is characterized in that: It also includes an SPI interface and a wireless communication module. One end of the SPI interface is connected to the electric valve, and the other end is connected to the wireless communication module. The wireless communication module is used for signal transmission between the controller and the electric valve.

4. The central air conditioning temperature control system based on a multi-story building according to claim 3 is characterized in that: The IO end of the SPI interface is connected to the switch of the electric valve, the nHOLD end of the SPI interface is connected to the seventh pin of the wireless communication module, and the nWP end of the SPI interface is connected to the third pin of the wireless communication module.

5. The central air conditioning temperature control system based on a multi-story building according to claim 1 is characterized in that: The fan coil unit has a fan control module, and the fan control module can communicate wirelessly with the controller to control the air cooling rate of the fan coil unit according to the control signal of the controller.

6. The central air conditioning temperature control system based on multi-story buildings according to claim 5 is characterized in that: The fan control module is a frequency converter.

7. The central air conditioning temperature control system based on a multi-story building according to claim 6 is characterized in that: The fan coil unit also includes a fan, a coil and a motor. The coil is connected to the refrigeration pump, and the fan is connected to the motor and is located on one side of the coil. The frequency converter is connected to the motor and wirelessly communicates with the controller. The frequency converter controls the rotation speed of the motor according to the wireless control signal of the controller, thereby controlling the air cooling rate of the fan coil unit.

8. The central air conditioning temperature control system based on a multi-story building according to claim 1 is characterized in that: The temperature detection module includes a temperature sensor.

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