Office building refrigerating unit system

Abstract

The utility model belongs to the technical field of office building refrigerating system design, and particularly provides an office building refrigerating unit system. A cooling water outlet of an air conditioner host unit is connected with a water inlet of a cooling tower; a water outlet of the cooling tower is connected to a cooling water return port of the air conditioner host unit through a cooling water return main pipe; a cooling water pump and a flow sensor are arranged on the cooling water return main pipe; a cooling water return port and a cooling water outlet of the air conditioner host unit are respectively provided with a temperature sensor; the system further comprises a master controller, a first slave controller and a second slave controller, wherein the first slave controller and the second slave controller are connected with the master controller. The flow sensor and the temperature sensor are respectively connected with the main controller; the first slave controller is connected with the chilled water pump through the chilled frequency converter; the second slave controller is connected with the cooling water pump through the cooling frequency converter. The master-slave architecture design can realize fine control of different devices and functions, and the control precision and efficiency of the system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of office building refrigeration design, and particularly relates to a refrigeration unit system for an office building. Background Art

[0002] Traditional refrigeration unit systems usually rely on a central controller for global regulation and management. However, in the face of large-scale and multi-variable control scenarios, its limitations gradually emerge. The processing capacity of a single controller is limited. When the refrigeration unit system needs to process a large amount of real-time data and control instructions, a single controller often struggles to bear such a huge pressure. This will lead to a significant decrease in data processing speed and may even result in data loss or control errors due to overload.

[0003] Traditional systems often struggle to achieve control over different devices and functions. This means that the system cannot be flexibly adjusted according to actual needs but can only operate according to a preset mode. This not only affects the operating efficiency of the system but may also lead to energy waste and unnecessary cost expenditures.

[0004] How to design a master-slave control architecture refrigeration system to meet the high requirements of modern office buildings for the refrigeration unit system is an urgent problem to be solved at present. Summary of the Invention

[0005] In view of the problems existing in the centralized control method of a single controller, this application designs a master-slave architecture control method. Specifically, this application provides a refrigeration unit system for an office building.

[0006] The utility model provides a refrigeration unit system for an office building, including an air-conditioning main unit, fan coil units, and air handling units. The air-conditioning main unit is provided with a chilled water supply port, a chilled water return port, a cooling water return port, and a cooling water outlet.

[0007] The chilled water supply port of the air-conditioning main unit is connected to a water distributor through a chilled water supply main pipe. The water distribution ports of the water distributor are respectively connected to the water inlet of the fan coil unit and the water inlet of the air handling unit. The chilled water return port of the air-conditioning main unit is connected to a water collector through a chilled water return main pipe. The water collection ports of the water collector are respectively connected to the water outlet of the fan coil unit and the water outlet of the air handling unit. A chilled water pump and a flow sensor are arranged on the chilled water return main pipe. Temperature sensors are respectively arranged at the chilled water supply port and the chilled water return port of the air-conditioning main unit.

[0008] The cooling water outlet of the air-conditioning main unit is connected to the water inlet of a cooling tower. The water outlet of the cooling tower is connected to the cooling water return port of the air-conditioning main unit through a cooling water return main pipe. A cooling water pump and a flow sensor are arranged on the cooling water return main pipe. Temperature sensors are respectively arranged at the cooling water return port and the cooling water outlet of the air-conditioning main unit.

[0009] The system further includes a main controller, a first slave controller and a second slave controller connected to the main controller; a flow sensor and a temperature sensor are respectively connected to the main controller;

[0010] The first slave controller is connected to a chilled water pump through a chilled water frequency converter;

[0011] The second slave controller is connected to a cooling water pump through a cooling water frequency converter.

[0012] As an optimization of the technical solution of the present utility model, a cooling fan is provided in the cooling tower, and the system further includes a third slave controller connected to the main controller;

[0013] The third slave controller is connected to the cooling fan through a cooling tower frequency converter.

[0014] As an optimization of the technical solution of the present utility model, the air conditioning main unit includes a condenser, an electronic expansion valve, an evaporator and a compressor;

[0015] The evaporator is connected to the compressor through a compressor inlet pipeline, the compressor is connected to the condenser through a compressor outlet pipeline, the condenser is connected to the electronic expansion valve through an electronic expansion valve inlet pipeline, and the electronic expansion valve is connected to the evaporator through an electronic expansion valve outlet pipeline;

[0016] Temperature sensors and pressure sensors connected to the main controller are respectively provided on both the compressor inlet pipeline and the electronic expansion valve outlet pipeline;

[0017] Temperature sensors connected to the main controller are respectively provided on both the compressor outlet pipeline and the electronic expansion valve inlet pipeline.

[0018] As an optimization of the technical solution of the present utility model, the first slave controller is connected to the chilled water frequency converter through a first D / A conversion module, the second slave controller is connected to the cooling water frequency converter through a second D / A conversion module, and the third slave controller is connected to the cooling tower frequency converter through a third D / A conversion module.

[0019] As an optimization of the technical solution of the present utility model, the main controller is connected to each temperature sensor, pressure sensor and flow sensor through an A / D conversion module.

[0020] As an optimization of the technical solution of the present utility model, the water collecting ports of the water collector include a first water collecting port and a second water collecting port;

[0021] The water outlet of the fan coil unit is connected to the first water collecting port of the water collector through a pipeline;

[0022] The water outlet of the air handling unit is connected to the second water collecting port of the water collector through a pipeline;

[0023] The water distributing ports of the water distributor include a first water distributing port and a second water distributing port;

[0024] The first water distributor port of the water distributor is connected to the water inlet of the fan coil unit through a pipeline;

[0025] The second water distributor port of the water distributor is connected to the water inlet of the air handling unit through a pipeline.

[0026] As an optimization of the technical solution of the present utility model, the number of fan coil units is several; the first water distributor ports of the water distributor are respectively connected to the water inlets of each fan coil unit through pipelines;

[0027] The water outlets of each fan coil unit are connected to the first water collection port of the water collector through pipelines.

[0028] As an optimization of the technical solution of the present utility model, the number of air handling units is several; the second water distributor ports of the water distributor are respectively connected to the water inlets of each air handling unit through pipelines; the water outlets of each air handling unit are connected to the second water collection port of the water collector through pipelines.

[0029] From the above technical solutions, it can be seen that the present utility model has the following advantages: The main controller, as the core of the system, collects and processes data from each sensor in real time, providing data support for the control of the system. Through the master-slave control architecture, the system can implement a hierarchical control strategy. The main controller is responsible for global regulation and instruction sending, while the slave controller is responsible for the control of specific devices. This strategy can achieve fine control of different devices and functions, improving the control accuracy and efficiency of the system.

[0030] The master-slave control architecture has good scalability and flexibility. As the system scale expands or functions increase, the number of slave controllers can be easily increased or the control strategy can be adjusted without large-scale modification of the main controller. By setting multiple slave controllers, the system can achieve redundant control of key devices and functions.

[0031] In addition, the design principle of the present utility model is reliable, the structure is simple, and it has a very wide application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a schematic block diagram of the device according to an embodiment of the present utility model.

[0034] Figure 2 It is a schematic connection block diagram of the main controller in the embodiment of the present utility model. Detailed implementation mode

[0035] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0036] As Figure 1 and Figure 2 shown, the embodiment of the present utility model provides an office building refrigeration unit system, including an air-conditioning main unit, fan coil units and an air handling unit. The air-conditioning main unit is provided with a chilled water supply port, a chilled water return port, a cooling water return port and a cooling water outlet port;

[0037] The chilled water supply port of the air-conditioning main unit is connected to a water distributor through a chilled water supply main pipe. The water distribution ports of the water distributor are respectively connected to the water inlet ports of the fan coil units and the air handling unit; the chilled water return port of the air-conditioning main unit is connected to a water collector through a chilled water return main pipe. The water collection ports of the water collector are respectively connected to the water outlet ports of the fan coil units and the air handling unit; a chilled water pump and a flow sensor are arranged on the chilled water return main pipe; temperature sensors are respectively arranged at the chilled water supply port and the chilled water return port of the air-conditioning main unit;

[0038] The cooling water outlet port of the air-conditioning main unit is connected to the water inlet port of a cooling tower; the water outlet port of the cooling tower is connected to the cooling water return port of the air-conditioning main unit through a cooling water return main pipe; a cooling water pump and a flow sensor are arranged on the cooling water return main pipe; temperature sensors are respectively arranged at the cooling water return port and the cooling water outlet port of the air-conditioning main unit;

[0039] The system further includes a main controller and a first slave controller and a second slave controller connected to the main controller; the flow sensor and the temperature sensor are respectively connected to the main controller;

[0040] The first slave controller is connected to the chilled water pump through a chilled water frequency converter;

[0041] The second slave controller is connected to the cooling water pump through a cooling water frequency converter.

[0042] By integrating the variable frequency control of the chilled water pump and the cooling water pump (respectively realized by the first slave controller and the second slave controller through the chilled water frequency converter and the cooling water frequency converter), the system can dynamically adjust the rotation speed of the water pumps according to actual needs, thereby accurately controlling the flow and pressure of the chilled water and the cooling water, and effectively reducing energy waste.

[0043] The main controller combines the real-time data of the flow sensor and the temperature sensor, and can comprehensively monitor the working status of the refrigeration unit, including key parameters such as the flow rate and temperature of the chilled water and the cooling water. This intelligent regulation mechanism not only ensures the stable operation of the system, but also can react in a timely manner under abnormal conditions, adjust the operation strategy, and improve the safety and reliability of the system.

[0044] The designed water distributor and water collector structure of the system enables the chilled water to be flexibly distributed to each fan coil unit and air handling unit, meeting the refrigeration requirements of different areas in the office building. This design enhances the flexibility and adaptability of the system and improves the comfort of the office environment.

[0045] The modular design makes each component relatively independent, facilitating daily maintenance and fault troubleshooting. When a problem occurs in a certain part of the system, the faulty component can be quickly located and replaced, reducing the impact on the overall system operation and lowering the maintenance cost and time.

[0046] In some embodiments, a cooling fan is provided in the cooling tower, and the system further includes a third slave controller connected to the main controller;

[0047] The third slave controller is connected to the cooling fan through a cooling tower frequency converter.

[0048] The introduction of the cooling fan significantly increases the air circulation speed in the cooling tower, accelerates the heat exchange process between water and air, thereby improving the heat dissipation efficiency. This means that the cooling water can be cooled faster, and then the circulation efficiency and refrigeration capacity of the entire refrigeration system are improved.

[0049] The third slave controller precisely adjusts the rotation speed of the cooling fan through the cooling tower frequency converter according to the system status information provided by the main controller and the actual requirements of the cooling tower. This architecture design ensures the best matching of the air volume and the cooling demand, avoids unnecessary energy waste, and further improves the energy-saving effect of the system.

[0050] In some embodiments, the air-conditioning main unit includes a condenser, an electronic expansion valve, an evaporator and a compressor;

[0051] The evaporator is connected to the compressor through the compressor inlet pipeline, the compressor is connected to the condenser through the compressor outlet pipeline, the condenser is connected to the electronic expansion valve through the electronic expansion valve inlet pipeline, and the electronic expansion valve is connected to the evaporator through the electronic expansion valve outlet pipeline;

[0052] Temperature sensors and pressure sensors connected to the main controller are respectively provided on both the compressor inlet pipeline and the electronic expansion valve outlet pipeline;

[0053] Temperature sensors connected to the main controller are respectively provided on both the compressor outlet pipeline and the electronic expansion valve inlet pipeline.

[0054] The specific working process is as follows:

[0055] When the system receives the start signal, the main controller first checks the status of each component. After ensuring no abnormalities, it starts the cooling water pump, chilled water pump, cooling fan, and compressor in sequence. At this time, the cooling water begins to circulate and dissipate heat through the cooling tower; the chilled water is ready to enter the evaporator for refrigeration. The compressor sucks in the low-temperature and low-pressure refrigerant gas, compresses it into a high-temperature and high-pressure gas, and enters the condenser through the compressor outlet pipeline. At the same time, the refrigerant in the evaporator evaporates under low pressure, absorbing the heat of the chilled water and cooling the chilled water. In this process, the chilled water at the inlet of the evaporator has a higher temperature, which decreases after passing through the evaporator and is sent to the fan coils and air handling units in each area of the office building through the chilled water supply pipeline. The high-temperature and high-pressure refrigerant gas exchanges heat with the cooling water in the condenser, releases heat, and condenses into a liquid. After the cooling water absorbs heat, its temperature rises and flows back to the cooling tower through the cooling water return pipeline for heat dissipation. When the condensed refrigerant liquid passes through the electronic expansion valve, its pressure and temperature are reduced through throttling and it becomes a low-temperature and low-pressure refrigerant liquid, and then enters the evaporator to continue the cycle. The opening degree of the electronic expansion valve is adjusted by the main controller according to the temperature and pressure signals at the outlet of the evaporator and the inlet of the condenser to maintain the stable operation of the system.

[0056] During the operation of the system, the main controller continuously receives data from various sensors (including temperature sensors and pressure sensors), and monitors the temperature and pressure at the inlet of the compressor, the outlet of the evaporator, the outlet of the compressor, and the inlet of the condenser. According to these data, the main controller ensures that the system is in the best working state by adjusting the operating states of the chilled water pump, cooling water pump, cooling fan, and electronic expansion valve. When the system receives the stop signal or detects abnormal conditions (such as too high temperature, abnormal pressure, etc.), the main controller will automatically shut down components such as the compressor, water pumps, and fans, and start the corresponding protection mechanism to prevent equipment damage and safety accidents.

[0057] In some embodiments, the first slave controller is connected to the chilled water frequency converter through the first D / A conversion module, the second slave controller is connected to the cooling water frequency converter through the second D / A conversion module, and the third slave controller is connected to the cooling tower frequency converter through the third D / A conversion module.

[0058] The first D / A conversion module, the second D / A conversion module, and the third D / A conversion module respectively convert the digital control signals of the first slave controller, the second slave controller, and the third slave controller into analog signals to drive the refrigeration frequency converter, the cooling frequency converter, and the cooling tower frequency converter. This conversion ensures the accuracy and smoothness of the control signals, making the speed regulation of devices such as water pumps and fans more delicate, thereby improving the overall control accuracy of the system. Different frequency converters may accept different types of control signals. Through the D / A conversion module, the unified digital control signal can be converted into an analog signal suitable for each frequency converter, enhancing the compatibility and flexibility of the system. Digital signals are more resistant to interference during transmission than analog signals. By using the D / A conversion module between the controller and the frequency converter, the control signal can be converted into a digital signal for transmission before transmission, and then converted into an analog signal for control at the frequency converter end, thus reducing interference during signal transmission and improving the stability of the system.

[0059] In some embodiments, the master controller is connected to each temperature sensor, pressure sensor, and flow sensor through an A / D conversion module.

[0060] The master controller is connected to each temperature sensor, pressure sensor, and flow sensor through an A / D conversion module, and can convert the analog signals output by the sensors into digital signals for processing. This conversion improves the accuracy and reliability of data acquisition, enabling the master controller to obtain system status information more accurately and providing strong support for the formulation of control strategies. Digital signals are easier to process and analyze than analog signals. The master controller quickly processes the converted digital signals, can monitor the system status in real time, detect and handle abnormal situations in a timely manner, and improves the response speed and stability of the system. As the system scale expands and functions increase, more sensors and controllers may need to be connected. The A / D conversion module provides a standardized interface, enabling new devices to be easily connected to the system and enhancing the scalability and maintainability of the system.

[0061] In some embodiments, the water collection ports of the water collector include a first water collection port and a second water collection port;

[0062] The water outlet of the fan coil unit is connected to the first water collection port of the water collector through a pipeline;

[0063] The water outlet of the air handling unit is connected to the second water collection port of the water collector through a pipeline;

[0064] The water distribution ports of the water distributor include a first water distribution port and a second water distribution port;

[0065] The first water distribution port of the water distributor is connected to the water inlet of the fan coil unit through a pipeline;

[0066] The second water distribution port of the water distributor is connected to the water inlet of the air handling unit through a pipeline.

[0067] In some embodiments, the number of fan coil units is several; the first water distribution ports of the water distributor are respectively connected to the water inlets of each fan coil unit through pipelines;

[0068] The water outlets of each fan coil unit are connected to the first water collection port of the water collector through pipelines.

[0069] In some embodiments, the number of air handling units is several; the second water distribution ports of the water distributor are respectively connected to the water inlets of each air handling unit through pipelines; the water outlets of each air handling unit are connected to the second water collection port of the water collector through pipelines.

[0070] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, those of ordinary skill in the art can make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions should all be within the scope of the present invention. / Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention.

Claims

1. An office building chiller unit system, characterized in that, It includes an air-conditioning main unit, fan coil units and air handling units. The air-conditioning main unit is provided with a chilled water supply port, a chilled water return port, a cooling water return port and a cooling water outlet port; The chilled water return port of the air-conditioning main unit is connected to a water collector through a chilled water return main pipe. The water collection ports of the water collector are respectively connected to the outlet ports of the fan coil units and the air handling units; a chilled water pump and a flow sensor are arranged on the chilled water return main pipe; temperature sensors are respectively arranged at the chilled water supply port and the chilled water return port of the air-conditioning main unit; The cooling water outlet port of the air-conditioning main unit is connected to the inlet port of a cooling tower; the outlet port of the cooling tower is connected to the cooling water return port of the air-conditioning main unit through a cooling water return main pipe; a cooling water pump and a flow sensor are arranged on the cooling water return main pipe; temperature sensors are respectively arranged at the cooling water return port and the cooling water outlet port of the air-conditioning main unit; This system also includes a main controller and a first slave controller and a second slave controller connected to the main controller; the flow sensors and the temperature sensors are respectively connected to the main controller; The first slave controller is connected to the chilled water pump through a chilled water frequency converter; The second slave controller is connected to the cooling water pump through a cooling water frequency converter.

2. The office building refrigeration unit system according to claim 1, wherein A cooling fan is arranged in the cooling tower. This system also includes a third slave controller connected to the main controller; The third slave controller is connected to the cooling fan through a cooling tower frequency converter.

3. The office building refrigeration unit system according to claim 1 or 2, characterized in that, The air-conditioning main unit includes a condenser, an electronic expansion valve, an evaporator and a compressor; The evaporator is connected to the compressor through a compressor inlet pipeline, the compressor is connected to the condenser through a compressor outlet pipeline, the condenser is connected to the electronic expansion valve through an electronic expansion valve inlet pipeline, and the electronic expansion valve is connected to the evaporator through an electronic expansion valve outlet pipeline; Temperature sensors and pressure sensors connected to the main controller are respectively arranged on both the compressor inlet pipeline and the electronic expansion valve outlet pipeline; Temperature sensors connected to the main controller are respectively arranged on both the compressor outlet pipeline and the electronic expansion valve inlet pipeline.

4. The office building refrigeration unit system according to claim 3, characterized in that, The first slave controller is connected to the chilled water frequency converter through a first D / A conversion module, the second slave controller is connected to the cooling water frequency converter through a second D / A conversion module, and the third slave controller is connected to the cooling tower frequency converter through a third D / A conversion module.

5. The office building refrigeration unit system according to claim 4, wherein, The main controller is connected to each temperature sensor, pressure sensor and flow sensor through an A / D conversion module.

6. The chiller system for office buildings according to claim 5, characterized in that, The water collection ports of the water collector include a first water collection port and a second water collection port; The outlet port of the fan coil unit is connected to the first water collection port of the water collector through a pipeline; The outlet port of the air handling unit is connected to the second water collection port of the water collector through a pipeline; The water distribution ports of the water distributor include a first water distribution port and a second water distribution port; The first water distribution port of the water distributor is connected to the inlet port of the fan coil unit through a pipeline; The second water distribution port of the water distributor is connected to the inlet port of the air handling unit through a pipeline.

7. The office building refrigeration unit system according to claim 6, wherein The number of fan coil units is several; the first water distribution port of the water distributor is respectively connected to the inlet ports of each fan coil unit through pipelines; The outlet ports of each fan coil unit are connected to the first water collection port of the water collector through pipelines.

8. The office building refrigeration unit system according to claim 7, characterized in that, The number of air handling units is several; the second water distribution port of the water distributor is respectively connected to the inlet ports of each air handling unit through pipelines; the outlet ports of each air handling unit are connected to the second water collection port of the water collector through pipelines.

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