CN110986196A - Evaporative cooling power VRV device for data center, control method and system - Google Patents
Evaporative cooling power VRV device for data center, control method and system Download PDFInfo
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- CN110986196A CN110986196A CN201911319855.XA CN201911319855A CN110986196A CN 110986196 A CN110986196 A CN 110986196A CN 201911319855 A CN201911319855 A CN 201911319855A CN 110986196 A CN110986196 A CN 110986196A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0035—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using evaporation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
Abstract
The invention relates to an evaporative cooling power VRV device for a data center, a control method and a system, and the device comprises a variable frequency compressor, a high pressure sensor, a condenser coil, an outdoor fan, a spraying system, a plurality of tail ends and a pipeline system for communicating the variable frequency compressor, the condenser coil and the tail ends, wherein the high pressure sensor is arranged in the pipeline system and used for measuring condensing pressure; the outdoor fan and the spraying system act on the condenser coil, the spraying system comprises a water tank, a water pump and a plurality of nozzles, and the water pump is arranged on a pipeline communicated with the nozzles. When the condensing pressure is low, the outdoor fan is started, the water pump is turned off, the refrigerating efficiency of the VRV is high, the improvement of the refrigerating efficiency by the spraying system is small, and meanwhile, the power consumption of the water pump is consumed to finish spraying, so that the energy-saving effect is not obvious; when the condensing pressure is higher, the outdoor fan and the water pump are started to cool the refrigerant, so that the condensing pressure can be reduced as much as possible, and the refrigerating efficiency is improved.
Description
Technical Field
The invention relates to the field of multi-split cooling, in particular to an evaporative cooling power multi-split VRV device for a data center, a control method and a control system.
Background
The increasingly strong energy conservation and emission reduction and green environmental protection appeal in the world put forward higher requirements on the energy consumption and cold quantity requirements of data centers in subway operation and IT industries; energy conservation becomes the primary appeal of the industry owners and design builders. In the field of air conditioners, a common multi-split air conditioning system has the advantages of multi-split and intelligence and is rapidly developed and applied. However, the existing multi-split air conditioning system also has certain problems in practical application, when the outdoor temperature is too high, the condensing pressure of the outdoor main machine is too large, the overall system efficiency is low, and meanwhile, the risk of shutdown is caused.
While the multi-split air conditioner used in the data center or in the subway rail transit adopts the single cooling condition (only refrigeration and no heating), the traditional multi-split air conditioner system adopts the heating condition in winter and the cooling condition in summer; therefore, the method is not suitable for data centers or subway rail transit, and is particularly important for a novel energy-saving multi-split system which is suitable for the situation and meets the situation. The VRV air conditioner is applicable to the field of machine rooms and the field of subway rail transit, the VRV air conditioner which can be used between the equipment rooms is almost rare, and most of the existing units have the following problems: when the outdoor temperature is too high, the condensation pressure of the common air-cooled multi-split outdoor unit is too high, so that the risk of shutdown or reduction of refrigeration efficiency of the multi-split system frequently occurs, and the stability and the service performance of the whole multi-split system are influenced; meanwhile, the problems that the multi-split energy consumption is too high and the refrigeration requirement of the tail end cannot be met are caused.
Disclosure of Invention
In view of the defects in the prior art, one of the objectives of the present invention is to provide an evaporative cooling powered VRV apparatus for a data center, which has the advantages of reducing the condensing pressure and improving the cooling efficiency.
The above object of the present invention is achieved by the following technical solutions:
an evaporative cooling power VRV device for a data center comprises a variable frequency compressor, a high-pressure sensor, a condenser coil, an outdoor fan, a spraying system, a plurality of tail ends and a pipeline system for communicating the variable frequency compressor, the condenser coil and the tail ends, wherein the high-pressure sensor is arranged in the pipeline system and used for measuring condensation pressure; the outdoor fan and the spraying system act on the condenser coil, the spraying system comprises a water tank, a water pump and a plurality of nozzles, and the water pump is arranged on a pipeline communicated with the nozzles.
By adopting the technical scheme, the high-pressure sensor collects the condensation pressure of the refrigerant, the condensation temperature is converted according to the condensation pressure and temperature mapping table of the saturated refrigerant, and different operation modes are adopted according to different condensation temperatures. When the condensing pressure is low, the outdoor fan is started, the water pump is turned off, the refrigerating efficiency of the VRV is high due to the low condensing pressure, the improvement of the refrigerating efficiency of the VRV by the spraying system is small, and meanwhile, the power consumption of the water pump is consumed to complete spraying, so that the whole energy-saving effect is not obvious; when the condensing pressure is higher, the outdoor fan and the water pump are started, the refrigerant is cooled at the coil pipe of the condenser, the condensing pressure can be reduced as much as possible, the refrigerating efficiency is improved, and the energy-saving effect is increased.
The present invention in a preferred example may be further configured to: the spraying system also comprises a water pressure sensor and a waterway executor, wherein the water pressure sensor is arranged at the spray head and used for acquiring the real-time water pressure of spraying water mist; the water path executor is arranged on a pipeline communicated with the spray head.
By adopting the technical scheme, the rotating speed of the water pump and the opening degree of the water path actuator are adjusted to adjust the pressure of the spraying water mist, and the water pressure is adjusted to be about 4-5 bar generally. If the pressure is too low, the atomization effect of the spray water can be not obvious; if the pressure is too high, the fins of the outdoor main machine can be damaged in the spraying process; the spraying water mist system is adjusted through the condensation temperature and the water pressure, the utilization rate of water resources is improved, and the energy efficiency of the VRV of the multi-split air conditioning system is improved; under general conditions, the heat exchange quantity of water is 1% of the latent heat quantity of atomized water, and the energy can be greatly saved by reasonably atomizing the spray water and fully utilizing the latent heat of the spray water.
The present invention in a preferred example may be further configured to: the spray head is a spray head with a variable spray angle.
By adopting the technical scheme, the spraying effect is improved, and meanwhile, the possibility of spray leakage caused by the fact that each area of the condenser coil cannot be sprayed by one spraying angle is reduced; secondly, because the condenser coil pipe can be scaled on the condenser coil pipe in the long-term use process, the heat transfer coefficient of the condenser coil pipe is reduced, the heat exchange amount is reduced, and the spray head with the variable spray angle can be used for cleaning all positions of the condenser coil pipe as far as possible.
The present invention in a preferred example may be further configured to: the pipeline system is provided with a gas-liquid separator and an oil separator, the variable frequency compressor is positioned between the gas-liquid separator and the oil separator, and the gas-liquid separator is arranged on a pipeline into which a refrigerant enters in the variable frequency compressor.
By adopting the technical scheme, the gas-liquid separator is mainly used for the phenomenon that liquid impact of the variable-frequency compressor can be caused due to the fact that liquid separation is possibly uneven at each tail end or the superheat degree of the whole main path is small; the oil separator is mainly characterized in that the pipeline of the whole device system is long, and the phenomenon of uneven oil return of the pipeline system can occur when the variable frequency compressor runs at low frequency or works in winter. By the aid of the device, the risk of liquid impact of the integral multi-split system and oil-free risk of the variable frequency compressor can be reduced, and the service life and the operation reliability of the integral multi-split system are improved.
The present invention in a preferred example may be further configured to: the orientation of the spray head and the orientation of the outdoor fan can be the same, opposite or vertical.
By adopting the technical scheme, the direction of the spraying water mist and the direction of the air volume can adopt forward flow, reverse flow or vertical flow, and can be selected at will according to actual needs.
The second aim of the invention is realized by the following technical scheme:
a VRV control method for an evaporative cooling power multi-split air conditioner for a data center comprises the steps of collecting condensation pressure P, converting condensation temperature T according to a condensation pressure and temperature mapping table of saturated refrigerants, and judging the condensation temperature T and a preset temperature threshold value T in real time1If T > T1If so, executing a first operation mode; if T is less than or equal to T1If so, executing a second operation mode; the first operation mode is that the refrigerant is controlled to be conveyed into the condenser coil pipe to be cooled through the outdoor fan and the spraying system, and the second operation mode is that the refrigerant is controlled to be conveyed into the condenser coil pipe to be cooled through the outdoor fan.
By adopting the technical scheme, the condensing pressure of the refrigerant is collected, the condensing temperature is converted according to the condensing pressure and temperature mapping table of the saturated refrigerant, and different operation modes are adopted according to different condensing temperatures. When the condensing pressure is low, the refrigerant in the condenser coil is cooled by the outdoor fan, the refrigerating efficiency of the VRV is high due to the low condensing pressure, the improvement of the refrigerating efficiency of the VRV by the spraying system is small, and meanwhile, the spraying is finished by consuming the power consumption of the water pump, so that the whole energy-saving effect is not obvious; when the condensing pressure is higher, the refrigerant in the condenser coil is cooled by the outdoor fan and the spraying system, so that the condensing pressure can be reduced as much as possible, the refrigerating efficiency is improved, and the energy-saving effect is improved.
In a preferred embodiment, the present invention may be further configured to preset the back pressure difference temperature △ T, and determine the condensing temperatures T and T in real time1- △ T, if T ≦ T1And T is more than or equal to T1△ T, the current operation mode is maintained.
By adopting the technical scheme, the times of exchanging the VRV between the first operation mode and the second operation mode are reduced, namely the times of starting and stopping the spraying system are reduced, the energy is saved, the efficiency is high, and the service life of the spraying system is prolonged.
The present invention in a preferred example may be further configured to: further comprises the steps of collecting the real-time water pressure F of spraying, and judging the real-time water pressure F and the optimal pressure F in real time0If the real-time water pressure F is at the optimum pressure F0The current spraying water pressure is maintained within the error threshold range; if the real-time water pressure F is less than the optimum pressure F0The lowest value of the error threshold value is used for controlling the increase of the spraying water pressure; if the real-time water pressure F is greater than the optimum pressure F0The highest value of the error threshold value, the spraying water pressure is controlled to be reduced.
By adopting the technical scheme, the real-time water pressure of spraying is collected, and the spraying water pressure is adjusted according to the real-time water pressure; if the pressure is too low, the atomization effect of the spray water can be not obvious; if the pressure is too high, the fins of the outdoor main machine can be damaged during the spraying process.
The third object of the invention is realized by the following technical scheme:
an evaporative cooling power VRV system for a data center comprises
The condensation pressure acquisition module is used for acquiring condensation pressure P;
the conversion module is used for converting the condensation temperature T according to the condensation pressure and temperature correspondence table of the saturated refrigerant;
a first control module for judging the condensation temperature T and a preset temperature threshold value T1If T > T1If so, executing a first operation mode; if T is less than or equal to T1If so, executing a second operation mode; the first operation mode is that the refrigerant is controlled to be conveyed into the condenser coil pipe to be cooled through the outdoor fan and the spraying system, and the second operation mode is that the refrigerant is controlled to be conveyed into the condenser coil pipe to be cooled through the outdoor fan.
By adopting the technical scheme, the condensation pressure acquisition module acquires condensation pressure and obtains condensation temperature through the conversion module; the first control module adopts different operation modes according to different condensation temperatures. When the condensing pressure is low, the refrigerant in the condenser coil is cooled by the outdoor fan, the refrigerating efficiency of the VRV is high due to the low condensing pressure, the improvement of the refrigerating efficiency of the VRV by the spraying system is small, and meanwhile, the spraying is finished by consuming the power consumption of the water pump, so that the whole energy-saving effect is not obvious; when the condensing pressure is higher, the refrigerant in the condenser coil is cooled by the outdoor fan and the spraying system, so that the condensing pressure can be reduced as much as possible, the refrigerating efficiency is improved, and the energy-saving effect is improved.
The present invention in a preferred example may be further configured to: also comprises
The spray water pressure acquisition module is used for acquiring real-time water pressure F of spray water mist;
a second control module for judging real-time water pressure F and optimal pressure F0If the real-time water pressure F is at the optimum pressure F0The current spraying water pressure is maintained within the error threshold range; if the real-time water pressure F is less than the optimum pressure F0The lowest value of the error threshold value is used for controlling the increase of the spraying water pressure; if the real-time water pressure F is greater than the optimum pressure F0The highest value of the error threshold value, the spraying water pressure is controlled to be reduced.
By adopting the technical scheme, the spray water pressure acquisition module acquires the real-time water pressure of spray water mist, and the second control module adjusts the spray water pressure according to the real-time water pressure; if the pressure is too low, the atomization effect of the spray water can be not obvious; if the pressure is too high, the fins of the outdoor main machine can be damaged during the spraying process.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the high-pressure sensor collects the condensation pressure of the refrigerant, the condensation temperature is converted according to the condensation pressure and temperature mapping table of the saturated refrigerant, and different operation modes are adopted according to different condensation temperatures. When the condensing pressure is low, the outdoor fan is started, the water pump is turned off, the refrigerating efficiency of the VRV is high due to the low condensing pressure, the improvement of the refrigerating efficiency of the VRV by the spraying system is small, and meanwhile, the power consumption of the water pump is consumed to complete spraying, so that the whole energy-saving effect is not obvious; when the condensing pressure is higher, an outdoor fan and a water pump are started, and the refrigerant is cooled at the coil pipe of the condenser, so that the condensing pressure can be reduced as much as possible, and the refrigerating efficiency is improved;
2. the rotating speed of the water pump and the opening degree of the waterway executor are adjusted to adjust the pressure of the spraying water mist; if the pressure is too low, the atomization effect of the spray water can be not obvious; if the pressure is too high, the fins of the outdoor main machine can be damaged in the spraying process; the spraying water mist system is adjusted through the condensation temperature and the water pressure, the utilization rate of water resources is improved, and the energy efficiency of the VRV of the multi-split air conditioning system is improved;
3. the spraying effect is increased, and meanwhile, the possibility of spray leakage caused by the fact that each area of the condenser coil cannot be sprayed by one spraying angle is reduced; secondly, because the condenser coil pipe can be scaled on the condenser coil pipe in the long-term use process, the heat transfer coefficient of the condenser coil pipe is reduced, the heat exchange amount is reduced, and the spray head with the variable spray angle can be used for cleaning all positions of the condenser coil pipe as far as possible.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
In the figure, 1, an inverter compressor; 2. a high pressure sensor; 3. a condenser coil; 4. an outdoor fan; 5. a terminal end; 6. a water tank; 7. a water pump; 8. a spray head; 9. a water pressure sensor; 10. a waterway executor; 11. a gas-liquid separator; 12. an oil separator; 13. drying the filter; 14. an electronic expansion valve; 15. a low pressure sensor; 16. a water filter; 17. a water inlet electromagnetic valve; 18. a water level sensor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows: an evaporative cooling power VRV device for a data center is shown in figure 1 and comprises a variable frequency compressor 1, a high pressure sensor 2, a condenser coil 3, an outdoor fan 4, a spraying system, a plurality of tail ends 5 and a pipeline system for communicating the variable frequency compressor 1, the condenser coil 3 and the tail ends 5, wherein the high pressure sensor 2 is arranged in the pipeline system; the outdoor fan 4 and the spraying system act on the condenser coil 3, the high-pressure sensor 2 is used for collecting the condensation pressure of the refrigerant, converting the condensation temperature according to the condensation pressure and temperature mapping table of the saturated refrigerant, and adopting different operation modes according to different condensation temperatures. In the embodiment, three tail ends 5 are provided, and cold energy is provided for a machine room or a subway equipment room and the like through the tail ends 5; the correspondence table of condensing pressure and temperature of saturated refrigerant is a well-known technology in the industry, that is, the pressure and temperature of the refrigerant in a saturated state are in one-to-one correspondence.
The spraying system comprises a water tank 6, a water pump 7 and a plurality of spray heads 8, wherein the water pump 7 is arranged on a pipeline communicated with the spray heads 8; water in the water tank 6 is pumped to the spray head 8 through the water pump 7 and sprayed to the outer surface of the condenser coil 3 through the spray head 8, and the spraying system is operated and stopped by opening and closing the water pump 7. The spray head 8 is a spray head 8 with a variable spray angle, and the spray head 8 is a spray head 8 adopted by the invention, and the spray head 8 with the variable spray angle is an existing product. In the process of spraying water mist by the spray head 8, the spraying angle of the spray head 8 is changed, so that the spraying effect can be increased, and the possibility of spraying leakage caused by the fact that each area of the condenser coil 3 cannot be sprayed by one spraying angle is reduced. Because the condenser coil 3 may be scaled on the outer surface of the condenser coil 3 in the long-term use process, the heat transfer coefficient of the condenser coil 3 is reduced, the heat exchange amount is reduced, and the spray head 8 with the variable spray angle can be used for cleaning all positions of the condenser coil 3 as far as possible.
A water inlet pipeline is installed on one side of the water tank 6, a water inlet electromagnetic valve 17 is installed on the water inlet pipeline, and a water level sensor 18 is installed in the water tank 6. The water level sensor 18 transmits the sensed water level signal to the controller, the computer in the controller compares the actually measured water level signal with the set signal to obtain deviation, and then the quality of opening and closing is sent to the water inlet electromagnetic valve 17 according to the deviation property, so that the water in the water tank 6 reaches the set water level. Install water filter 16 on the pipeline that shower nozzle 8 communicates, filter water through water filter 16, reduce the jam that impurity in aquatic caused shower nozzle 8 to can slow down condenser coil 3's the surface scale deposit speed. The direction of the spray head 8 and the direction of the outdoor fan 4 can be the same, opposite or vertical, the direction of the spray water mist and the direction of the air volume can adopt forward flow, reverse flow or vertical flow, and the direction can be selected according to actual needs. In other embodiments, the direction of the sprayed water mist and the direction of the air volume can adopt other oblique flows.
The spraying system also comprises a water pressure sensor 9 and a waterway executor 10, wherein the water pressure sensor 9 is arranged at the spray head 8 and is used for acquiring the real-time water pressure of spraying water mist; the water path actuator 10 is arranged on a pipeline communicated with the spray head 8, and the water pump 7 is positioned between the spray head 8 and the water path actuator 10. The pressure of the spraying water mist is adjusted through the rotating speed of the water pump 7 and the opening degree of the water path actuator 10, and the water pressure is adjusted to be about 4 bar-5 bar generally. If the pressure is too low, the atomization effect of the spray water can be not obvious; if the pressure is too high, the fins of the outdoor main machine can be damaged in the spraying process; the spraying water mist system is adjusted through the condensation temperature and the water pressure, the utilization rate of water resources is improved, and the energy efficiency of the VRV of the multi-split air conditioning system is improved; under general conditions, the heat exchange quantity of water is 1% of the latent heat quantity of atomized water, and the energy can be greatly saved by reasonably atomizing the spray water and fully utilizing the latent heat of the spray water.
The pipeline system is provided with a gas-liquid separator 11 and an oil separator 12, the variable frequency compressor 1 is positioned between the gas-liquid separator 11 and the oil separator 12, and the gas-liquid separator 11 is arranged on a pipeline for entering the refrigerant in the variable frequency compressor 1. The gas-liquid separator 11 is mainly used for liquid impact phenomenon which can cause the variable frequency compressor 1 due to uneven liquid separation of each tail end 5 or small superheat degree of the whole main path; the oil separator 12 is mainly because the pipeline of the whole device system is long, and the phenomenon of uneven oil return of the pipeline system can occur when the variable frequency compressor 1 runs at low frequency or works in winter. By the aid of the device, the risk of liquid impact of the whole multi-split system and oil-free risk of the variable frequency compressor 1 can be reduced, and the service life and the operation reliability of the whole multi-split system are improved.
The pipeline system is also provided with a dry filter 13 and a low-pressure sensor 15, the dry filter 13 is positioned between the condenser coil 3 and the tail end 5, and the dry filter 13 is used for drying the refrigerant to reduce the moisture in the refrigerant; the low pressure sensor 15 is arranged on an inlet pipeline of the refrigerant in the inverter compressor 1 and is used for acquiring the real-time pressure of the refrigerant input into the inverter compressor 1. The suction superheat of the inverter compressor 1 is controlled according to the pressure of the input refrigerant, the suction superheat of the air conditioner, which is usually referred to as a condenser, refers to the difference between the saturation temperature corresponding to the refrigerant pressure at a certain point of the outlet of the condenser and the actual refrigerant temperature, wherein the saturation temperature corresponding to the refrigerant pressure and the actual refrigerant temperature are calculated as a prior art method and are not described in detail herein. The input pipelines of the plurality of tail ends 5 are all provided with electronic expansion valves 14, and the refrigeration quantity requirement of each tail end 5 is regulated and controlled through the electronic expansion valves 14.
The implementation principle of the above embodiment is as follows: when the condensing pressure is lower, the outdoor fan 4 is started, the water pump 7 is closed, the inverter compressor 1 is started, the refrigerant enters the condenser coil 3 through the oil separator 12, is cooled by the outdoor fan 4 in the condenser coil 3, enters the tail end 5 to provide cooling capacity for a machine room or a subway equipment room and the like, and finally returns to the inverter compressor 1 through the gas-liquid separator 11. When the condensing pressure is high, the outdoor fan 4, the water pump 7 and the variable frequency compressor 1 are started, the pressure of the spraying water mist is adjusted through the rotating speed of the water pump 7 and the opening degree of the water path actuator 10, the refrigerant enters the condenser coil 3 through the oil separator 12, is cooled by the outdoor fan 4 and the spraying water mist in the condenser coil 3, enters the tail end 5 to provide cooling capacity for a machine room or a subway equipment room and the like, and finally returns to the variable frequency compressor 1 through the gas-liquid separator 11. Therefore, the condensing pressure can be reduced as much as possible, and the refrigerating efficiency is improved.
Example two: a VRV control method for an evaporative cooling power multi-split air conditioner for a data center comprises the steps of collecting condensation pressure P, converting condensation temperature T according to a condensation pressure and temperature mapping table of saturated refrigerants, and judging the condensation temperature T and a preset temperature threshold value T in real time1If T > T1If so, executing a first operation mode; if T is less than or equal to T1If so, executing a second operation mode; the first operation mode is to control the refrigerant to be conveyed into the condenser coil 3 to be cooled through the outdoor fan 4 and the spraying system, and the second operation mode is to control the refrigerant to be conveyed into the condenser coil 3 to be cooled through the outdoor fan 4.
For the judging process, in the embodiment, the judging process is not limited, and T > T may be judged first1If not, judging other conditions; or can judge T is less than or equal to T1If not, judging other conditions; the subsequent judgment process is the same. Wherein the preset temperature threshold value T1It may be a set constant value or a value updated in real time, and in any case, it is a known value in the solution of the present invention, and how to obtain it is not within the scope of the discussion of the solution of the present invention. In this example T1Typically at 45 ℃.
Collecting the condensation pressure of the refrigerant, converting the condensation temperature according to the condensation pressure and temperature mapping table of the saturated refrigerant, and adopting different operation modes according to different condensation temperatures. Namely, when the condensing pressure is low, the refrigerant in the condenser coil 3 is cooled by the outdoor fan 4, the refrigerating efficiency of the VRV is high due to the low condensing pressure, and the improvement of the refrigerating efficiency of the VRV by the spraying system is small, and meanwhile, the power consumption of the water pump 7 is consumed to complete spraying, so that the whole energy-saving effect is not obvious; when the condensing pressure is higher, the refrigerant in the condenser coil 3 is cooled by the outdoor fan 4 and the spraying system, so that the condensing pressure can be reduced as much as possible, the refrigerating efficiency is improved, and the energy-saving effect is increased.
Presetting a return difference temperature △ T, and judging the condensing temperatures T and T in real time1- △ T, if T ≦ T1And T is more than or equal to T1When the temperature is- △ T, the current operation mode is maintained, in the embodiment, △ T is 2 ℃ in general, namely the first operation mode executed when the condensation pressure is collected last time, and when the condensation pressure is collected again, T is less than or equal to T1And T is more than or equal to T1△ T is the first mode of operation, the second mode of operation performed the last time the condensing pressure was collected, and T ≦ T for the second time the condensing pressure was collected1And T is more than or equal to T1And △ T executing a second operation mode, reducing the times of switching the VRV between the first operation mode and the second operation mode, namely reducing the times of starting and stopping the spraying system, saving energy, improving efficiency and prolonging the service life of the spraying system.
Further comprises the steps of collecting the real-time water pressure F of spraying, and judging the real-time water pressure F and the optimal pressure F in real time0If the real-time water pressure F is at the optimum pressure F0The current spraying water pressure is maintained within the error threshold range; if the real-time water pressure F is less than the optimum pressure F0The lowest value of the error threshold value is used for controlling the increase of the spraying water pressure; if the real-time water pressure F is greater than the optimum pressure F0The highest value of the error threshold value, the spraying water pressure is controlled to be reduced. Collecting real-time water pressure of spraying, and adjusting the water pressure of spraying according to the real-time water pressure; if the pressure is too low, the atomization effect of the spray water can be not obvious; if the pressure is too high, the fins of the outdoor main machine can be damaged during the spraying process. The error threshold range in this embodiment is greater than 0.9F0Less than 1.1F0(ii) a The error range may be set to be larger than 0.9F0Less than 1.1F0Or other ranges, may be set according to actual needs.
Example three: an evaporative cooling power VRV system for a data center comprises
The condensation pressure acquisition module is used for acquiring condensation pressure P;
the conversion module is used for converting the condensation temperature T according to the condensation pressure and temperature correspondence table of the saturated refrigerant;
a first control module for judging the condensation temperature T and a preset temperature threshold value T1If T > T1When it is, thenExecuting a first operation mode; if T is less than or equal to T1If so, executing a second operation mode; the first operation mode is to control the refrigerant to be conveyed into the condenser coil 3 to be cooled through the outdoor fan 4 and the spraying system, and the second operation mode is to control the refrigerant to be conveyed into the condenser coil 3 to be cooled through the outdoor fan 4.
The condensation pressure acquisition module acquires condensation pressure and obtains condensation temperature through the conversion module; the first control module adopts different operation modes according to different condensation temperatures. Namely, when the condensing pressure is low, the refrigerant in the condenser coil 3 is cooled by the outdoor fan 4, the refrigerating efficiency of the VRV is high due to the low condensing pressure, and the improvement of the refrigerating efficiency of the VRV by the spraying system is small, and meanwhile, the power consumption of the water pump 7 is consumed to complete spraying, so that the whole energy-saving effect is not obvious; when the condensing pressure is higher, the refrigerant in the condenser coil 3 is cooled by the outdoor fan 4 and the spraying system, so that the condensing pressure can be reduced as much as possible, the refrigerating efficiency is improved, and the energy-saving effect is increased.
The spraying water pressure acquisition module is used for acquiring real-time water pressure F of spraying water mist; a second control module for judging real-time water pressure F and optimal pressure F0If the real-time water pressure F is at the optimum pressure F0The current spraying water pressure is maintained within the error threshold range; if the real-time water pressure F is less than the optimum pressure F0The lowest value of the error threshold value is used for controlling the increase of the spraying water pressure; if the real-time water pressure F is greater than the optimum pressure F0The highest value of the error threshold value, the spraying water pressure is controlled to be reduced. The spraying water pressure acquisition module acquires real-time water pressure of spraying water mist, and the second control module adjusts the spraying water pressure according to the real-time water pressure; if the pressure is too low, the atomization effect of the spray water can be not obvious; if the pressure is too high, the fins of the outdoor main machine can be damaged during the spraying process.
Example four: a computer storage medium is stored with a computer program which can be loaded by a processor and executes the VRV control method of the evaporative cooling power multi-split system for the data center in the second embodiment, and the method is convenient to realize.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. An evaporative cooling power VRV device for a data center is characterized in that: the device comprises a variable frequency compressor (1), a high-pressure sensor (2), a condenser coil (3), an outdoor fan (4), a spraying system, a plurality of tail ends (5) and a pipeline system for communicating the variable frequency compressor (1), the condenser coil (3) and the plurality of tail ends (5), wherein the high-pressure sensor (2) is arranged in the pipeline system and used for measuring condensation pressure; outdoor fan (4) with spraying system all acts on condenser coil pipe (3), spraying system includes water tank (6), water pump (7) and a plurality of shower nozzle (8), water pump (7) set up on the pipeline that shower nozzle (8) communicate.
2. The evaporative cooling powered VRV apparatus for a data center of claim 1, wherein: the spraying system further comprises a water pressure sensor (9) and a water path actuator (10), wherein the water pressure sensor (9) is arranged at the spray head (8) and is used for acquiring the real-time water pressure of spraying water mist; the water path executor (10) is arranged on a pipeline communicated with the spray head (8).
3. The evaporative cooling powered VRV apparatus for a data center of claim 1, wherein: the spray head (8) is a spray head (8) with a variable spray angle.
4. The evaporative cooling powered VRV apparatus for a data center of claim 1, wherein: the pipeline system is provided with a gas-liquid separator (11) and an oil separator (12), the variable-frequency compressor (1) is located between the gas-liquid separator (11) and the oil separator (12), and the gas-liquid separator (11) is arranged on a pipeline where refrigerant enters in the variable-frequency compressor (1).
5. The evaporative cooling powered VRV apparatus for a data center of claim 1, wherein: the orientation of the spray head (8) and the orientation of the outdoor fan (4) can be the same, opposite or vertical.
6. An evaporative cooling power VRV control method for a data center is characterized in that: comprises collecting condensing pressure P, converting condensing temperature T according to the condensing pressure and temperature corresponding table of saturated refrigerant, and real-time judging condensing temperature T and preset temperature threshold T1If T > T1If so, executing a first operation mode; if T is less than or equal to T1If so, executing a second operation mode; the first operation mode is that the refrigerant is controlled to be conveyed into the condenser coil (3) to be cooled through the outdoor fan (4) and the spraying system, and the second operation mode is that the refrigerant is controlled to be conveyed into the condenser coil (3) to be cooled through the outdoor fan (4).
7. The VRV control method for the evaporative cooling power multi-split air conditioning system of claim 6, wherein a return difference temperature △ T is preset, and condensation temperatures T and T are determined in real time1- △ T, if T ≦ T1And T is more than or equal to T1△ T, the current operation mode is maintained.
8. The VRV control method for an evaporative cooling power multi-split air conditioning system for a data center according to claim 6, wherein: further comprises the steps of collecting the real-time water pressure F of spraying, and judging the real-time water pressure F and the optimal pressure F in real time0If the real-time water pressure F is at the optimum pressure F0The current spraying water pressure is maintained within the error threshold range; if the real-time water pressure F is less than the optimum pressure F0The lowest value of the error threshold value is used for controlling the increase of the spraying water pressure; if the real-time water pressure F is greater than the optimum pressure F0The highest value of the error threshold value, the spraying water pressure is controlled to be reduced.
9. An evaporative cooling power VRV system for a data center is characterized in that: comprises that
The condensation pressure acquisition module is used for acquiring condensation pressure P;
the conversion module is used for converting the condensation temperature T according to the condensation pressure and temperature correspondence table of the saturated refrigerant;
a first control module for judging the condensation temperature T and a preset temperature threshold value T1If T > T1If so, executing a first operation mode; if T is less than or equal to T1If so, executing a second operation mode; the first operation mode is that the refrigerant is controlled to be conveyed into the condenser coil (3) to be cooled through the outdoor fan (4) and the spraying system, and the second operation mode is that the refrigerant is controlled to be conveyed into the condenser coil (3) to be cooled through the outdoor fan (4).
10. The evaporative cooling powered VRV system for data centers of claim 9, wherein: also comprises
The spray water pressure acquisition module is used for acquiring real-time water pressure F of spray water mist;
a second control module for judging real-time water pressure F and optimal pressure F0If the real-time water pressure F is at the optimum pressure F0The current spraying water pressure is maintained within the error threshold range; if the real-time water pressure F is less than the optimum pressure F0The lowest value of the error threshold value is used for controlling the increase of the spraying water pressure; if the real-time water pressure F is greater than the optimum pressure F0The highest value of the error threshold value, the spraying water pressure is controlled to be reduced.
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