Multi-modular fluorine pump air conditioning system of data center

Abstract

The utility model provides a data center multi-modular fluorine pump air-conditioning system, which comprises at least two outdoor hosts, indoor hosts and a pump cabinet, two adjacent indoor hosts are respectively connected with different outdoor hosts, and the outdoor hosts and the plurality of indoor hosts share one pump cabinet. Temperature and pressure sensors are installed at refrigerant pipeline outlets of all outdoor hosts and all indoor hosts, frequent mode switching of the system caused by short-time sudden change of outdoor environment parameters can be effectively avoided, and the stability of the system is improved. The outlet end of each outdoor host is provided with an electric ball valve, load distribution of each outdoor host in a natural cold mode can be adjusted, meanwhile, when the environment temperature rises and the system is switched from the natural cold mode to the mechanical refrigeration mode, the electric ball valves of part of the outdoor hosts can flexibly adjust the starting number of the outdoor hosts according to the refrigeration target of the system, and the system reliability is improved. And energy consumption increase caused by excessive compressor starting is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration systems, and in particular to a multi-modular fluorine pump air conditioning system for a data center. Background Art

[0002] As the cornerstone of digital construction, data centers have become the focus of the country's low-carbon strategy due to their high energy consumption and high electricity density. In recent years, with the gradual deepening of the country's "dual carbon" strategy, a series of policies that restrict the efficiency of power utilization in data centers and urge the green development of the digital economy have been promulgated. Efficient and energy-saving transformation has become an inevitable requirement for the continued development of large-scale data centers. Therefore, the industry analyzes the energy structure of data centers and proposes a series of improvement measures for refrigeration systems in computer rooms that have a large proportion of energy consumption and high optimization potential. Among them, a fluorine pump air-conditioning technology that reduces the energy consumption of the refrigeration system by introducing a natural cold source has been widely studied in the refrigeration field due to its simple structure and obvious energy-saving effect. As the scale of data centers continues to expand, traditional multi-link fluorine pump units that rely only on a single outdoor refrigeration host to connect multiple indoor terminals are gradually unable to meet the cooling load and reliability requirements of commercial refrigeration. Modular multi-link fluorine pump units with a wider cooling range, more flexible commercial adaptation, and cooling load backup functions are gradually favored by the industry.

[0003] Similar to traditional fluorine pump multi-split units, modular multi-split fluorine pump air conditioning units have two refrigeration modes and related architectures: mechanical compression and fluorine pump natural cooling, which are used to meet the refrigeration needs of high temperatures in summer and low temperatures in winter, respectively. Compared with pure mechanical compression air conditioning units, the system's annual power consumption is effectively reduced. However, due to the large number of outdoor main units and indoor terminals in the multi-module fluorine pump system and the more complex pipe network connection, when the system switches and adjusts the refrigeration mode according to changes in the outdoor environment, if only relying on the control scheme of the traditional fluorine pump air conditioner, the cooling effect of the refrigeration system on the cabinet equipment may be unreliable. Therefore, this utility model patent proposes a corresponding solution for the mode switching control method of the multi-module fluorine pump unit based on the traditional fluorine pump air conditioning control scheme. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a multi-module fluorine pump air conditioning system for a data center to solve the problem of unreliable cooling effect during switching operation modes of the multi-module fluorine pump air conditioning in the data center.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] A multi-modular fluorine pump air conditioning system for a data center, comprising an outdoor unit, an indoor unit and a transition cabinet group; the outdoor unit comprises at least two outdoor main units, the outdoor main unit comprises a condenser and a compressor, a one-way valve is installed at the output end of the condenser, an electric regulating ball valve is installed at the outlet end of the outdoor main unit, a pressure sensor and a temperature sensor are installed between the one-way valve and the electric regulating ball valve, the input end of the compressor is connected to the inlet end of the outdoor main unit through a solenoid valve, the output end of the compressor is connected to the input end of the condenser, and a one-way valve is connected in parallel between the input end of the solenoid valve and the output end of the compressor.

[0007] The indoor unit includes at least two indoor hosts, two adjacent indoor hosts are connected to different outdoor hosts respectively, the indoor host includes an evaporator, the input end of the evaporator is connected to the inlet end of the indoor host through an electronic expansion valve, a temperature sensor is installed between the inlet of the electronic expansion valve and the inlet end of the indoor host, the output end of the evaporator is connected to the outlet end of the indoor host, and a temperature sensor and a humidity sensor are installed between the output end of the evaporator and the outlet end of the indoor host.

[0008] The transition cabinet group includes at least two pump cabinets, and the outdoor host and the plurality of indoor hosts share one pump cabinet. The pump cabinet includes a fluorine pump and a liquid reservoir. The liquid inlet of the liquid reservoir is connected to the inlet end of the pump cabinet, and the input end of the fluorine pump is connected to the liquid outlet of the liquid reservoir through a solenoid valve. A pressure sensor is installed between the input end of the solenoid valve and the liquid outlet of the liquid reservoir. The output end of the fluorine pump is connected to the outlet end of the pump cabinet, and a pressure sensor and a temperature sensor are installed between the output end of the fluorine pump and the outlet end of the pump cabinet. A one-way valve is connected in parallel between the input end of the solenoid valve and the output end of the fluorine pump.

[0009] As a further preferred embodiment of the present invention, dry-bulb and wet-bulb thermometers are installed at the inlet and outlet ends of the outdoor host, the pump cabinet and the indoor host.

[0010] As a further preferred embodiment of the present invention, the one-way valve is installed at the output end of the condenser, and the installation height of the one-way valve is higher than that of the pump cabinet.

[0011] As a further preferred embodiment of the present invention, the fluorine pump is a variable frequency fluorine pump.

[0012] Compared with the prior art, the utility model has the following advantages or technical effects:

[0013] Temperature and pressure sensors are installed at the refrigerant pipeline outlets of each outdoor host and each indoor host. The determination of the system mode depends not only on the outdoor ambient temperature and humidity parameters, but also on the subcooling and superheating of the refrigerant at the outlets of the host module and the terminal module. This can effectively avoid frequent system mode switching caused by short-term sudden changes in outdoor environmental parameters and improve system stability.

[0014] The adjacent indoor hosts and the corresponding outdoor hosts in the system do not switch from mechanical cooling to natural cooling mode at the same time. When some indoor hosts and the corresponding outdoor hosts switch to the natural cooling state, the adjacent indoor hosts increase their load and operate, which can effectively avoid overheating of some cabinets due to unreliable cooling effect during the system mode switching process.

[0015] A one-way valve is installed at the end of the outdoor host condenser, and the installation height is higher than the pump cabinet module, which can effectively avoid the problem of refrigerant backflowing to the condenser during the compressor shutdown and system pressure rebalancing process.

[0016] Pressure sensors are installed at the inlet and outlet ends of the pump cabinet. The variable frequency fluorine pump used can control the start and stop and adjust the speed according to the inlet and outlet pressure difference and the subcooling degree of the condenser outlet of the outdoor host, which is beneficial to improve the utilization efficiency of natural cold sources and reduce the flash of refrigerant in long pipelines.

[0017] An electric ball valve is installed at the outlet of each outdoor host, which is conducive to adjusting the load distribution of each outdoor host in the natural cooling mode. At the same time, when the ambient temperature rises and the system switches from the natural cooling mode to the mechanical refrigeration mode, the electric ball valves of some outdoor hosts can flexibly adjust the number of outdoor hosts enabled according to the system cooling target, avoiding increased energy consumption caused by too many compressors being enabled. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of multi-module fluorine pump air conditioning system in data center;

[0019] Figure 2 This is a simplified diagram of the outdoor host structure;

[0020] Figure 3 This is a simplified diagram of the pump cabinet structure;

[0021] Figure 4 This is a simplified diagram of the indoor host structure;

[0022] Figure 5 It is the control flow chart for switching to natural cooling mode;

[0023] Figure 6 This is the control flow chart for mechanical cooling mode switching. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0025] It should be noted that the terms "part", "other", "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or apparatus. Example

[0026] Figure 1 This is a schematic diagram of a multi-modular fluorine pump air conditioning system for a data center according to an embodiment of the utility model. Figure 1 As shown, when the system meets the natural cooling mode switching conditions, a mode switching instruction is sent to each indoor host, outdoor host and pump cabinet. The indoor host of group A and the connected hosts perform mode switching according to the control principle. During the process, the adjacent indoor hosts of groups B and C and the connected hosts increase the cooling capacity. After the switching process of group A is completed and the system is stable, the indoor host of group B and the connected hosts perform mode switching according to the control principle. During the process, the adjacent indoor hosts of groups A and C and the connected hosts increase the cooling capacity. Similarly, when the indoor host of group C and the connected hosts perform mode switching according to the control principle, the adjacent indoor hosts of groups A and B and the connected hosts increase the cooling capacity. The purpose is to reduce the fluctuation of cooling capacity caused by the stoppage of the compressor and fluorine pump, the reduction of the terminal electronic expansion valve and the imbalance of system pressure during the process of switching the system from mechanical cooling mode to natural cooling mode, avoid overheating of the cabinet during the period, and improve the stability and safety of the system. It should be noted that the terms "Group A", "Group B", "Group C" in the description of this embodiment and the above-mentioned drawings, as well as the connection order and number of connections of the indoor terminals and the main units in the drawings are used to distinguish similar objects, rather than referring to a fixed order, number of units and parallel connection method.

[0027] Figure 2 This is a simplified diagram of the outdoor host structure. Figure 2 As shown, the outdoor host includes a condenser and a compressor. A one-way valve is installed at the output end of the condenser, and an electric regulating ball valve is installed at the outlet end of the outdoor host. A pressure sensor and a temperature sensor are installed between the one-way valve and the electric regulating ball valve. The input end of the compressor is connected to the inlet end of the outdoor host through a solenoid valve, and the output end of the compressor is connected to the input end of the condenser. A one-way valve is connected in parallel between the input end of the solenoid valve and the output end of the compressor. An electric regulating valve is installed at the outlet end of the outdoor host to adjust the cooling capacity distribution of each host module in the natural cooling mode; a one-way valve is installed at the end of the condenser to avoid the refrigerant backflowing back to the condenser due to pressure imbalance during the system mode switching process; pressure and temperature sensors are installed at the inlet and outlet ends of the outdoor host to monitor the host inlet refrigeration superheat and the condenser outlet supercooling; the outdoor unit is installed with temperature and humidity sensors to monitor outdoor environmental parameters.

[0028] Figure 3 This is a schematic diagram of the pump cabinet structure. Figure 3 As shown, the pump cabinet includes a fluorine pump and a liquid reservoir. The fluorine pump is a variable frequency fluorine pump. The liquid inlet of the liquid reservoir is connected to the inlet end of the pump cabinet. The input end of the fluorine pump is connected to the liquid outlet of the liquid reservoir through a solenoid valve. A pressure sensor is installed between the input end of the solenoid valve and the liquid outlet of the liquid reservoir. The output end of the fluorine pump is connected to the outlet end of the pump cabinet, and a pressure sensor and a temperature sensor are installed between the output end of the fluorine pump and the outlet end of the pump cabinet. A one-way valve is connected in parallel between the input end of the solenoid valve and the output end of the fluorine pump. Pressure and temperature sensors are installed at the inlet and outlet of the fluorine pump to monitor the pressure difference between the inlet and outlet of the fluorine pump and the degree of supercooling to adjust the speed of the fluorine pump and the cooling capacity of the condenser; the refrigerant pipelines in the pump cabinet are divided into mechanical refrigeration and natural cooling modes, and both are equipped with one-way valves to avoid refrigerant backflow when the system pressure is unbalanced.

[0029] Further explanation: A one-way valve is installed at the end of the outdoor main unit condenser, and the installation height is higher than the pump cabinet module, which can effectively avoid the problem of refrigerant backflowing to the condenser when the compressor is shut down and the system pressure is rebalanced.

[0030] Figure 4 This is a simplified diagram of the indoor host structure. Figure 4 As shown, the indoor host includes an evaporator, the input end of the evaporator is connected to the inlet end of the indoor host through an electronic expansion valve, a temperature sensor is installed between the inlet of the electronic expansion valve and the inlet end of the indoor host, the output end of the evaporator is connected to the outlet end of the indoor host, and a temperature sensor and a humidity sensor are installed between the output end of the evaporator and the outlet end of the indoor host. The inlet and outlet ends of the indoor host are equipped with temperature and pressure sensors for monitoring the inlet refrigerant subcooling and outlet superheating to adjust the terminal electronic expansion valve opening, and the evaporator is equipped with temperature and humidity sensors for monitoring indoor environmental parameters and the evaporator outlet air temperature.

[0031] Figure 5 This is the control flow chart for switching the natural cooling mode of the multi-modular fluorine pump air conditioning system in the data center. Figure 5 As shown in the figure, when the system detects that the outdoor dry-bulb and wet-bulb temperatures meet the natural cooling conditions, it sends a command to start natural cooling to the outdoor host. The system selects an indoor host that has not entered the natural cooling mode and the connected host group to switch the mode. At this time, the condensers of all outdoor hosts, including those in standby state, are turned on and the condensing fan is increased to the maximum speed to reduce the decrease in the system refrigeration capacity caused by the mode switching process of this group. The host group selected for mode switching controls the built-in compressor to slowly reduce the frequency until it is turned off. Its refrigeration capacity is controlled by the system adjusting the opening of the electric regulating ball valve according to the refrigeration target. The adjacent indoor host that has not switched the mode appropriately increases the opening of the electronic expansion valve to improve the refrigeration capacity and avoid overheating of the indoor cabinet in the area. After the system completes the above operations and the internal pressure is rebalanced, the corresponding pump cabinet in the mode switching unit is started and the fluorine pump speed is adjusted according to the inlet and outlet refrigerant pressure difference. The corresponding indoor host adjusts the opening of the electronic expansion valve to complete the mode switching of the group of units. After that, the system determines whether all host groups have completed the natural cooling mode switching. If completed, the system has switched to the natural cooling mode. Otherwise, repeat the above operations until the system is completely switched to the natural cooling mode.

[0032] Figure 6 This is the control flow chart for the mechanical refrigeration mode switching of the multi-modular fluorine pump air conditioning system in the data center. Figure 6 As shown, when the system detects that the outdoor dry-bulb and wet-bulb temperatures and the terminal outlet temperature of the host do not meet the natural cooling conditions, it enters the mechanical refrigeration mode switching process. At this time, the system determines the number of compressors that should be enabled after switching to the mechanical refrigeration mode based on the refrigeration target and sends corresponding adjustment instructions to each outdoor host accordingly. Among them, the outdoor host that receives the instruction to enable the built-in compressor unit adjusts the electric ball valve opening to the maximum, enables the built-in compressor and adjusts the refrigeration capacity according to the compressor frequency. The outdoor host that receives the instruction not to enable the built-in compressor unit adjusts the electric ball valve opening to the minimum and enters the standby mode. After the system completes the above operations and the internal pressure is rebalanced, each indoor host adjusts the opening of the electronic expansion valve, and the system completes the switch from natural cooling mode to mechanical refrigeration mode.

[0033] Under various operating conditions, compared with the traditional fluorine pump multi-unit, the modular multi-unit has a wide refrigeration range, flexible and convenient commercial combination, and high safety. The control method effectively avoids the problem of reduced system heat dissipation effect caused by the start and stop adjustment of the compressor and the fluorine pump during the mode switching of the modular multi-unit fluorine pump unit. The parts not described in this utility model patent are applicable to the prior art.

Claims

1. A multi-modular fluorine pump air conditioning system for a data center, characterized in that: It includes an outdoor unit, an indoor unit and a transition cabinet group; the outdoor unit includes at least two outdoor hosts, the outdoor host includes a condenser and a compressor, a one-way valve is installed at the output end of the condenser, an electric regulating ball valve is installed at the outlet end of the outdoor host, a pressure sensor and a temperature sensor are installed between the one-way valve and the electric regulating ball valve, the input end of the compressor is connected to the inlet end of the outdoor host through a solenoid valve, the output end of the compressor is connected to the input end of the condenser, and a one-way valve is connected in parallel between the input end of the solenoid valve and the output end of the compressor; The indoor unit comprises at least two indoor hosts, two adjacent indoor hosts are respectively connected to different outdoor hosts, the indoor host comprises an evaporator, the input end of the evaporator is connected to the inlet end of the indoor host through an electronic expansion valve, a temperature sensor is installed between the inlet of the electronic expansion valve and the inlet end of the indoor host, the output end of the evaporator is connected to the outlet end of the indoor host, and a temperature sensor and a humidity sensor are installed between the output end of the evaporator and the outlet end of the indoor host; The transition cabinet group includes at least two pump cabinets, and the outdoor host and the plurality of indoor hosts share one pump cabinet. The pump cabinet includes a fluorine pump and a liquid reservoir. The liquid inlet of the liquid reservoir is connected to the inlet end of the pump cabinet, and the input end of the fluorine pump is connected to the liquid outlet of the liquid reservoir through a solenoid valve. A pressure sensor is installed between the input end of the solenoid valve and the liquid outlet of the liquid reservoir. The output end of the fluorine pump is connected to the outlet end of the pump cabinet, and a pressure sensor and a temperature sensor are installed between the output end of the fluorine pump and the outlet end of the pump cabinet. A one-way valve is connected in parallel between the input end of the solenoid valve and the output end of the fluorine pump.

2. A data center multi-modular fluorine pump air conditioning system according to claim 1, characterized in that: The inlet and outlet ends of the outdoor host, the pump cabinet and the indoor host are all equipped with dry-bulb and wet-bulb thermometers.

3. A data center multi-modular fluorine pump air conditioning system according to claim 1, characterized in that: The one-way valve is installed at the output end of the condenser, and the installation height of the one-way valve is higher than the pump cabinet.

4. A data center multi-modular fluorine pump air conditioning system according to claim 1, characterized in that: The fluorine pump is a variable frequency fluorine pump.

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