CN115051265B - Power distribution room temperature control method - Google Patents
Power distribution room temperature control method Download PDFInfo
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- CN115051265B CN115051265B CN202210984311.0A CN202210984311A CN115051265B CN 115051265 B CN115051265 B CN 115051265B CN 202210984311 A CN202210984311 A CN 202210984311A CN 115051265 B CN115051265 B CN 115051265B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/56—Cooling; Ventilation
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
- G05D23/193—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces
- G05D23/1932—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of a plurality of spaces
- G05D23/1934—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of a plurality of spaces each space being provided with one sensor acting on one or more control means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/24—Circuit arrangements for boards or switchyards
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Ventilation (AREA)
- Control Of Temperature (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
The invention relates to a power distribution room temperature control method which is realized by a power distribution room temperature control system. The power distribution room temperature control system cancels a forced air draft unit and is provided with a directional cold conveying unit. The directional cooling unit is used for pumping cooling energy towards the power distribution cabinet which is arranged in the power distribution room and is kept in an operating state. And in unit time, the directional cold conveying unit adjusts the cold quantity pumped into the power distribution cabinet by the directional cold conveying unit according to the difference of actual heat productivity in the operation process of a single power distribution cabinet. Therefore, on one hand, in actual operation, the working noise emitted by the directional cooling unit is relatively small, and the phenomenon that a large amount of external dust invades into the power distribution cabinet under the action of strong negative pressure is effectively avoided; on the other hand, in the whole cooling process, each power distribution cabinet is kept in an independent temperature control state, so that the distribution of the cold energy produced by the directional cold conveying units is more targeted, and the directional cold conveying units are ensured to be always kept in a low-energy-consumption operation state.
Description
Technical Field
The invention relates to the technical field of construction of distribution rooms, in particular to a distribution room temperature control method.
Background
The distribution room is an indoor distribution place with low-voltage load. Generally speaking, the distribution room is simultaneously provided with a plurality of groups of distribution cabinets to satisfy the power consumption requirements of low-voltage users.
Distribution cabinets (especially high voltage distribution cabinets) have very high requirements on the ambient temperature. In hot summer, and the power distribution cabinet needs to be kept in heavy load operation or overload operation for a long time according to the actual requirements of users, the electric components in the power distribution cabinet inevitably generate a large amount of heat, so that on one hand, the service life of the electric components in the power distribution cabinet can be seriously shortened, and a large amount of manpower and material resources are required to be invested to carry out repair and renewal operations on the electric components; on the other hand, along with the accumulation of heat, the temperature in the cavity of the power distribution cabinet rises rapidly, so that electrical components (such as a circuit breaker) are very easy to generate heat seriously, and further, the phenomenon of overheating and ignition or electric arc is very easy to occur, even a switch trip accident can be caused under the serious condition, and the continuity of power supply and the safety of operation of a power distribution room are finally influenced.
In order to solve the above problems, the current state of the industry is to combine the forced air draft method and the forced cooling method. The specific method for realizing the forced draft mode comprises the following steps: the wall surrounding the distribution room is embedded with a plurality of axial flow fans to discharge indoor hot air outdoors, and meanwhile, fresh air with relatively low outdoor temperature is sent indoors. The specific method for realizing the forced refrigeration mode comprises the following steps: the outdoor unit is fixed on the outer wall of the distribution room and mainly comprises a compressor, a condenser, a capillary tube, an electronic valve and the like. In actual operation, the compressor compresses freon into high-temperature high-pressure liquid state, and follow-up through the condenser cooling, obtains the vaporization in order to absorb a large amount of heat in the periphery at last in the evaporimeter. The indoor unit is built in the distribution room to continuously emit cold air to the surrounding environment and mainly comprises a motor, a fan, an evaporator and the like. The scheme combining the forced air draft mode and the forced refrigeration mode can effectively eliminate the waste heat in the power distribution cabinet to reduce the room temperature, and heat emitted in the working process of the power distribution cabinet can be quickly dissipated. However, the one-time investment cost is large, the construction period is long, and in practical application, the following problems exist: aiming at the forced air draft mode, the axial flow fan can generate larger noise during actual operation, and further the daily life of surrounding residents can be influenced. And in the process of carrying out the air exchange at electricity distribution room and outside atmosphere, must have a large amount of dusts to enter into the electricity distribution room through the air inlet under the strong negative pressure effect, not only be unfavorable for the maintenance of the clean environment in the electricity distribution room, the dust that invades the switch board still can be attached to the electrical components surface moreover, and then has slowed down thermal dissipation speed. For the forced refrigeration mode, a good heat dissipation environment is provided for all power distribution cabinets by reducing the overall indoor room temperature of the power distribution cabinets. The lack of the cold energy generated by the actual operation of the refrigeration air conditioner is obvious in pertinence, and the indoor temperature of the power distribution room is integrally reduced in the process of continuous cold energy input, namely the difference of the cold energy received by each power distribution cabinet in unit time is not large, however, according to experience, the heat generated by the power distribution cabinets with different specifications and types in the working state is different, and the respective high temperature resistant limit values are also different, so that the unnecessary waste of the power of the refrigeration air conditioner is increased, the energy consumption is high, and the realization of the energy-saving emission-reduction and green design target is finally not facilitated. Thus, a skilled person is urgently needed to solve the above problems.
Disclosure of Invention
Therefore, in view of the above-mentioned problems and drawbacks, the present invention provides a method for controlling room temperature of power distribution system, which is a method for controlling room temperature of power distribution system, and comprises a plurality of steps of collecting relevant data, evaluating and considering the data, and performing experiments and modifications by a plurality of technicians with years of research and development experience.
In order to solve the technical problem, the invention relates to a power distribution room temperature control method which is realized by a power distribution room temperature control system. The distribution room temperature control system is used for cooling the distribution room.
The power distribution room temperature control system cancels a forced air draft unit and comprises a directional cold conveying unit. The directional cooling unit is used for pumping cooling energy towards the power distribution cabinet which is arranged in the power distribution room and is kept in an operating state. And in unit time, the directional cold conveying unit adjusts the cold quantity pumped into the power distribution cabinet by the directional cold conveying unit according to the difference of actual heat productivity in the operation process of a single power distribution cabinet.
As a further improvement of the technical solution disclosed in the present invention, assuming that the number of the power distribution cabinets disposed in the power distribution room is N, the directional cooling unit includes a condenser, a compressor, N branch pipes, and N evaporators. The condenser and the compressor are both mounted outside the electrical distribution room and cooperate to produce high temperature, high pressure liquid freon. The evaporators are arranged in the power distribution cabinet in a one-to-one correspondence mode, and are communicated with the condenser through the corresponding branch pipelines. In the process that the high-temperature high-pressure liquid Freon is vaporized due to the pressure reduction, the evaporator can release cold energy towards the inner cavity of the corresponding power distribution cabinet.
As a further improvement of the technical scheme disclosed by the invention, the directional cooling unit further comprises N temperature sensors and a controller. The temperature sensors are arranged in the power distribution cabinets in a one-to-one correspondence mode so as to monitor the temperature value of the inner cavity of the power distribution cabinet in real time. The controller controls the amount of the high-temperature high-pressure liquid Freon received by the evaporator in unit time in real time according to the temperature value fed back by the temperature sensor.
As a further improvement of the disclosed solution, the evaporator comprises a high conductance cold shell. The high-conductivity cold shell is internally provided with a containing cavity for receiving and containing high-temperature high-pressure liquid Freon. Under operating condition, in the twinkling of an eye that high temperature high pressure liquid freon enters into the chamber of holding via the branch pipeline, its pressure that receives reduces sharply, and high temperature high pressure liquid freon is vaporized, and the cold volume that generates is in order to realize the heat exchange with the switch board inner chamber with the radiation cooling mode via high cold casing of leading.
As a further improvement of the technical scheme disclosed by the invention, a series of fins continuously extend outwards from the outer wall of the high heat conduction shell.
As a further improvement of the technical scheme disclosed by the invention, the power distribution room temperature control system further comprises a dust cover. The dust cover is used for protecting the compressor and is detachably fixed on the outer wall of the power distribution room.
As a further improvement of the technical scheme disclosed by the invention, the dust cover comprises a supporting frame and a filter screen. The support frame is detachably fixed on the outer wall of the power distribution room through expansion bolts. The filter screen is supported by the supporting frame, and the mesh number of the filter screen is controlled to be 80-120.
Through adopting above-mentioned technical scheme to set up, distribution room temperature control system has obtained the following several beneficial effects at least in the practical application process:
1) The forced air draft unit is omitted, and effective and stable cooling of each power distribution cabinet can be realized only by means of the directional cold conveying unit, so that on one hand, the design structure of the power distribution cabinet temperature control system is simplified, and the construction cost is effectively reduced; on the other hand, in actual operation, the working noise emitted by the directional cooling unit is relatively small, and the directional cooling unit is friendly to the environment of surrounding residents; on the other hand, a large amount of external dust is prevented from invading the interior of the power distribution cabinet under the action of strong negative pressure, heat generated by internal electric components is ensured to be rapidly dissipated, and the phenomenon of overhigh temperature caused by heat accumulation is avoided;
2) According to the difference of specific models and specifications of the power distribution cabinets, the cooling capacity received by the power distribution cabinets in unit time and from the directional cooling units is different, namely, each power distribution cabinet is kept in an independent temperature control state, so that the distribution of the total cooling capacity is more targeted, the phenomenon of meaningless waste of the power of the directional cooling units is effectively avoided, and the power distribution cabinets are ensured to be always kept in a low-energy-consumption state in the actual operation process.
In addition, the room temperature control method of the power distribution room can be realized by the room temperature control system of the power distribution room. The controller comprises a numerical calculation module and a numerical judgment module. And the artificial preset judgment threshold value of the numerical judgment module is delta. Any power distribution cabinet is selected, the ideal working temperature is assumed to be T, and the real-time temperature value in the selected power distribution cabinet monitored by the temperature sensor is T. The T is sent to the controller through a data bus in real time, the T, T is calculated and judged through the numerical value calculating module and the numerical value judging module, and when the T-T is larger than or equal to delta, the evaporator arranged in the power distribution cabinet is continuously pumped into the high-temperature high-pressure liquid Freon; as time advances, when T-T < [ delta ], the evaporator arranged in the power distribution cabinet reduces the amount of high-temperature high-pressure liquid Freon received by the evaporator; and when T is less than T-2, the evaporator arranged in the power distribution cabinet stops receiving the high-temperature high-pressure liquid Freon.
As a further improvement of the technical scheme disclosed by the invention, the delta is less than or equal to 10 ℃; t is less than or equal to 60 ℃.
As a further improvement of the technical scheme disclosed by the invention, the directional cooling unit also comprises N flow control valves. The flow control valves are matched with the branch pipelines in a one-to-one correspondence manner, and cooperate with the controller to control the amount of high-temperature and high-pressure liquid Freon conveyed to the evaporator through the condenser in unit time. And aiming at the selected power distribution cabinet, when T-T is not less than delta, the flow control valve is adjusted to be in a full-open state. When T-T < [ delta ], calculating the ratio alpha of (2*t-T- [ delta ])/2T, adjusting the flow control valve to be in a half-open state, and assuming that the flow of the high-temperature and high-pressure liquid Freon through the flow control valve in the half-open state is A and the flow through the flow control valve in the full-open state is B in unit time, the A/B = alpha; as time continues to advance, the flow control valve is adjusted to a fully closed state when T < T-2.
In practical application, the power distribution room temperature control method has the following beneficial technical effects:
when the temperature reduction treatment is required to be carried out on the inner cavity of a single power distribution cabinet, the temperature value of the inner cavity of the power distribution cabinet is monitored through a temperature sensor, and is compared with an ideal working temperature T determined according to the specific model and specification of the power distribution cabinet, and then a controller sends out a corresponding execution signal to determine whether to pump high-temperature high-pressure liquid Freon towards an evaporator corresponding to the temperature sensor and the quantity of the high-temperature high-pressure liquid Freon pumped towards an evaporator corresponding to the temperature sensor in unit time, so that on one hand, the pump cooling capacity pre-received by the power distribution cabinet is different according to the specific model, specification and real-time temperature state, and the directional cooling unit is always maintained in a low energy consumption state on the premise of ensuring the reliable and effective temperature reduction of the power distribution cabinet; on the other hand, all the power distribution cabinets in the power distribution room are arranged as a whole by adopting the technical scheme, so that the working temperature of each power distribution cabinet is effectively kept below the limit temperature all the time, and the working performance of each electrical element in the power distribution cabinet is further ensured to be effectively exerted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first embodiment of a room temperature control system according to the present invention.
Fig. 2 is a schematic structural diagram of a power distribution room temperature control system according to a second embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a power distribution room temperature control system according to a third embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a power distribution room temperature control system according to a fourth embodiment of the present invention.
1-a directional cold conveying unit; 11-a condenser; 12-a compressor; 13-branch pipeline; 131-a first branch line; 132-a second branch line; 133-a third branch line; 14-an evaporator; 141-a first evaporator; 142-a second evaporator; 143-a third evaporator; 15-a temperature sensor; 16-a flow control valve; 161-first flow control valve; 162-a second flow control valve; 163-third flow control valve; 2-a dust cover; 21-a support frame; 22-a filter screen.
Detailed Description
In the following, the contents of the present invention are further described in detail with reference to specific embodiments, and fig. 1 shows a schematic structural diagram of a first embodiment of the room temperature control system for power distribution room of the present invention, which shows that, compared with the conventional design, the application of forced draft unit is eliminated and a directional cooling unit 1 is provided. In practical use, the directional cooling unit 1 is used to simultaneously pump cooling energy into the distribution cabinet which is arranged in the distribution room and is kept in an operating state. And in unit time, the directional cold conveying unit 1 adjusts the cold quantity pumped into the power distribution cabinet according to the difference of the actual heat productivity in the operation process of a single power distribution cabinet.
As shown in fig. 1, in the present embodiment, assuming that the number of the power distribution cabinets disposed in the power distribution room is 3, the directional cooling unit 1 is mainly composed of a condenser 11, a compressor 12, 3 branch pipes 13 (including a first branch pipe 131, a second branch pipe 132, and a third branch pipe 133), and 3 evaporators 14 (including a first evaporator 141, a second evaporator 142, and a third evaporator 143). Wherein, condenser 11 and compressor 12 all install on the outer wall of electricity distribution room, and cooperate in order to compress gaseous freon into high temperature high pressure liquid freon. The first evaporator 141, the second evaporator 142 and the third evaporator 143 are respectively and correspondingly arranged in the first power distribution cabinet, the second power distribution cabinet and the third power distribution cabinet, and are communicated with the condenser 11 by the corresponding first branch pipeline 131, the second branch pipeline 132 and the third branch pipeline 133. In the process of vaporizing the high-temperature high-pressure liquid freon due to the pressure reduction, the first evaporator 141, the second evaporator 142 and the third evaporator 143 can respectively release different cold quantities towards the inner cavities of the first power distribution cabinet, the second power distribution cabinet and the third power distribution cabinet.
Furthermore, as is clear from fig. 1, 3 temperature sensors 15 and a controller (not shown) are additionally provided in the directional cooling unit 1. 3 temperature sensor 15 place in first switch board, second switch board, third switch board in respectively the one-to-one to monitor the temperature value of distributing each electric cabinet inner chamber in real time. In addition, in order to ensure that the monitored temperature value has a better reference value, each temperature sensor 15 should be possibly far away from the installation positions of the first evaporator 141, the second evaporator 142 and the third evaporator 143, and should be installed at the critical bottom plate positions of 5-10 cm height of the first power distribution cabinet, the second power distribution cabinet and the third power distribution cabinet, respectively. The controller controls the amounts of the high-temperature and high-pressure liquid freon received by the first evaporator 141, the second evaporator 142 and the third evaporator 143 in unit time according to the temperature values fed back by the temperature sensors 15.
Through adopting above-mentioned technical scheme to set up, this distribution room temperature control system has obtained following several beneficial effects at least when practical application:
1) The forced air draft unit is omitted, and the first power distribution cabinet, the second power distribution cabinet and the third power distribution cabinet can be effectively and stably cooled only by the directional cold conveying unit 1, so that on one hand, the design structure of the power distribution room temperature control system is simplified, and the construction cost is effectively reduced; on the other hand, in actual operation, the working noise emitted by the directional cooling unit 1 is relatively small, and the directional cooling unit is friendly to the environment of surrounding residents; on the other hand, a large amount of external dust is prevented from invading the interiors of the first power distribution cabinet, the second power distribution cabinet and the third power distribution cabinet under the action of strong negative pressure, the internal electrical components are prevented from being adhered by the dust, the heat generated by the electrical components is ensured to be dissipated quickly, and the phenomenon of overhigh temperature caused by heat accumulation is avoided;
2) According to the difference of specific models and specifications of the first power distribution cabinet, the second power distribution cabinet and the third power distribution cabinet, the cooling capacity received by the first power distribution cabinet, the second power distribution cabinet and the third power distribution cabinet in unit time and from the directional cooling unit 1 is also different, that is, the first power distribution cabinet, the second power distribution cabinet and the third power distribution cabinet are kept in independent cooling states in the process of temperature reduction, so that the distribution of the cooling capacity generated by the directional cooling unit 1 is more targeted, the phenomenon that the working power of the directional cooling unit 1 is wasted meaninglessly is effectively avoided, and the directional cooling unit 1 is kept in a low-energy-consumption state in the actual operation process all the time.
In addition, it should be noted that, taking the first evaporator 141 as an example, as shown in fig. 1, the main structure thereof is a high-heat-conduction cold casing (preferably made of pure copper or pure aluminum with good heat conductivity), and the conventional design of cross-flow fan is eliminated. The high-conductivity cold shell is internally provided with a containing cavity for receiving and containing high-temperature high-pressure liquid Freon. Under operating condition, in the moment that high temperature high pressure liquid freon enters into the chamber of holding via first branch pipeline 132, its pressure that receives reduces sharply, and high temperature high pressure liquid freon is vaporized, and the cold volume of generating is in order to realize with the heat exchange of switch board inner chamber with the radiation cooling mode via high cold casing of leading. Therefore, on one hand, the volume of the inner cavity of the first power distribution cabinet, the second power distribution cabinet or the third power distribution cabinet is relatively small, and the cold energy can be quickly and effectively diffused in the inner cavity only by means of a radiation cooling mode without the help of a conventional convection mode, so that the working temperature of each electric component is always kept below an allowable temperature value; on the other hand, in the whole cooling process, the electric components are not affected by the action of airflow disturbance force all the time, so that the phenomenon of premature connection looseness or even accidental falling off of the mounting panel caused by severe shaking is effectively avoided; on the other hand, the design structure of the first evaporator 141 is also effectively simplified, which is beneficial to reducing the manufacturing cost thereof.
In view of enhancing the radiation cooling efficiency of the cooling capacity in each distribution cabinet as much as possible, as a further optimization of the above technical solution, a series of fins (not shown in the figure) may be further extended outwards from the outer wall of the high-heat-conduction cooling housing. So, the existence of a plurality of fins can improve the direct contact area of high cold-conducting shell and air in the switch board effectively, does benefit to and promotes cold volume towards diffusion rate all around.
Here, a power distribution room temperature control method adapted to the first embodiment is also disclosed, which specifically includes: the controller comprises a numerical value calculating module and a numerical value judging module. And the artificial preset judgment threshold value of the numerical judgment module is delta. For any power distribution cabinet as an example, assume that the ideal working temperature is T, and the real-time temperature value monitored by the built-in temperature sensor 15 is T. T is sent to the controller through a data bus in real time, and T, T is calculated and judged through a numerical value calculating module and a numerical value judging module, when T-T is larger than or equal to delta, the evaporator 14 corresponding to T is continuously pumped into high-temperature high-pressure liquid Freon; as time progresses, when T-T < [ delta ], the evaporator 14 corresponding thereto reduces the amount of high temperature, high pressure liquid freon it receives; as time continues to advance, when T < T-2, the corresponding evaporator 14 ceases to receive high temperature, high pressure liquid freon.
Taking the cooling operation of the inner cavity of the first power distribution cabinet as an example, under a certain condition, assuming that the ideal working temperature T of the first power distribution cabinet is 45 ℃, the temperature value T monitored by the first temperature sensor 151 is 60 ℃, and the artificially preset judgment threshold value is 5 ℃, as T-T =15 ℃ > - Δ, the first evaporator 141 is continuously pumped into the high-temperature high-pressure liquid freon at a large flow rate, so as to ensure that sufficient cooling capacity is pumped into the inner cavity of the first power distribution cabinet, and thus, the electric components in the first power distribution cabinet are rapidly cooled; with the continuous progress of the cooling process, assuming that the real-time temperature value monitored by the first temperature sensor 151 is T reduced to 49 ℃, and because T-T =4 ℃ <. Delta, the first evaporator 141 reduces the amount of high-temperature high-pressure liquid state freon received by the first evaporator in unit time, that is, on the premise of ensuring that the temperature of the inner cavity of the first power distribution cabinet is maintained below the maximum allowable temperature value, the working power of the condenser 11 and the compressor 12 is reduced, thereby being beneficial to the realization of the design goal of reducing the consumption of electric energy; as the time continues to advance, assuming that the real-time temperature value monitored by the first temperature sensor 151 is t reduced to 40 ℃, since t =40 ℃ is less than 45 ℃ -2 ℃, the first evaporator 141 stops receiving the high-temperature high-pressure liquid freon, that is, the first evaporator 141 stops working, so as to avoid the occurrence of a phenomenon of excessive generation of a large amount of cold energy due to excessive cold energy input, and further, the total energy consumption of the directional cooling unit 1 is favorably reduced.
Similarly, the second power distribution cabinet and the third power distribution cabinet also adopt the same method as the first power distribution cabinet to perform cooling operation on the inner cavities of the second power distribution cabinet and the third power distribution cabinet, and are not repeated herein for the sake of economy. It should be noted that, according to the types and specifications of the first switch board, the second switch board and the third switch board and the determined threshold Δ, the assumed ideal operating temperature T and the actual monitored temperature T, the amounts of the high-temperature high-pressure liquid freon received by the first evaporator 141, the second evaporator 142 and the third evaporator 143 in a unit time are also different. And when the temperature value t monitored in the inner cavity of a certain power distribution cabinet is lower than a certain specific value under the ideal working temperature, the evaporator 14 corresponding to the temperature value t completely stops receiving high-temperature high-pressure liquid Freon, so that the problem of unnecessary energy consumption caused by excessive input of cold energy is avoided.
According to the demonstration of practical experimental results, the power distribution room temperature control method has the following beneficial technical effects:
1) The pump cooling capacity received by the first power distribution cabinet, the second power distribution cabinet and the third power distribution cabinet is different according to the specific models and specifications of the first power distribution cabinet, the second power distribution cabinet and the third power distribution cabinet and the real-time temperature state, so that the directional cooling unit is always maintained in a low-energy consumption state on the premise of ensuring the power distribution cabinets to be reliably cooled;
2) As for all the power distribution cabinets (including the first power distribution cabinet, the second power distribution cabinet and the third power distribution cabinet) in the power distribution room as a whole, the working temperatures of the first power distribution cabinet, the second power distribution cabinet and the third power distribution cabinet are effectively guaranteed to be always kept below the allowable temperature, and the working performance of each electric element in the power distribution cabinets can be effectively exerted.
Fig. 2 is a schematic structural diagram of a room temperature control system according to a second embodiment of the present invention, which is different from the first embodiment in that: the directional cooling unit 1 is further provided with 3 flow control valves 16, which are a first flow control valve 161, a second flow control valve 162 and a third flow control valve 163. A first flow control valve 161 is associated with the first branch line 131 and cooperates with the controller to control the amount of high temperature, high pressure liquid freon delivered per unit time through the condenser 11 to the first evaporator 141. A second flow control valve 162 is associated with the second branch line 132 and cooperates with the controller to control the amount of high temperature, high pressure liquid freon delivered per unit time through the condenser 11 to the second evaporator 142. A third flow control valve 163 is associated with the third branch line 133 and cooperates with the controller to control the amount of high temperature, high pressure liquid freon delivered per unit time through the condenser 11 to the third evaporator 143.
Here, a distribution room temperature control method adapted to the second embodiment is also disclosed, which aims to conveniently adjust the amounts of the high-temperature and high-pressure liquid freon allowed to be received by the first evaporator 141, the second evaporator 142, and the second evaporator 143 in a unit time, specifically as follows: for the selected switch cabinet, the flow control valve 16 is adjusted to a fully open state when T-T ≧ Δ. When T-T < [ delta ], calculating a ratio [ alpha ] of (2*t-T- ] to 2T, adjusting the flow control valve 16 to a half-open state, and assuming that the flow rate of the high-temperature and high-pressure liquid freon through the flow control valve 16 in the half-open state is a and the flow rate through the flow control valve 16 in the full-open state is B, a/B = [ alpha ] in a unit time; as time continues to advance, the flow control valve 16 is adjusted to a fully closed state when T < T-2.
Here, still taking the cooling operation of the inner cavity of the first power distribution cabinet as an example, under a certain situation, assuming that the ideal working temperature T of the first power distribution cabinet is 45 ℃, the temperature value T monitored by the first temperature sensor 151 is 60 ℃, the artificially preset judgment threshold value is 5 ℃, and the first flow control valve 161 is adjusted to the fully open state because T-T =15 ℃ > Δ, the first evaporator 141 is continuously pumped into the high-temperature high-pressure liquid freon at a large flow rate, so as to ensure that sufficient cooling capacity is pumped into the inner cavity of the first power distribution cabinet, and thus to ensure that the internal electrical components of the first power distribution cabinet are rapidly cooled; as the cooling process continues, assuming that the real-time temperature value monitored by the first temperature sensor 151 is T decreased to 49 ℃, and since T-T =4 ℃ <. Delta, the ratio of (2 x 60-45-5)/90 is calculated to be 0.78, and the flow control valve 16 is adjusted to be in a half-open state, i.e. 78% opening degree, which means that the amount of the high-temperature and high-pressure liquid freon received by the first evaporator 141 in a unit time at the moment is only 78% of the initial amount, so that the working power of the condenser 11 and the compressor 12 is decreased on the premise of ensuring that the temperature of the inner cavity of the first power distribution cabinet is maintained below the maximum allowable temperature value, thereby facilitating the implementation of the design goal of reducing the consumption of electric energy; as the time continues to advance, assuming that the real-time temperature value monitored by the first temperature sensor 151 is t reduced to 40 ℃, because t =40 ℃ is less than 45 ℃ -2 ℃, the first flow control valve 161 is adjusted to a fully-closed state, and the first evaporator 141 completely stops receiving the high-temperature high-pressure liquid freon, so as to avoid the occurrence of a phenomenon of excessive generation of a large amount of cold energy caused by excessive cold energy input, and further facilitate the reduction of the overall energy consumption of the directional cooling unit 1.
Similarly, in this embodiment, the second power distribution cabinet and the third power distribution cabinet perform the cooling operation on the inner cavity thereof in the same way as the first power distribution cabinet, and are not described herein again for the sake of brevity.
Fig. 3 shows a schematic structural diagram of a room temperature control system according to a third embodiment of the present invention, and the difference between the first embodiment and the second embodiment is only that: the first flow control valve 161, the second flow control valve 162, and the third flow control valve 163 are each a one-way flow control valve (formed by combining a throttle valve and a one-way valve). Thus, in actual operation, the one-way flow control valve has a one-way throttling function, that is, when the high-temperature and high-pressure liquid freon needs to be pumped into the first evaporator 141, the second evaporator 142 and the third evaporator 143 from the condenser 11, the first flow control valve 161, the second flow control valve 162 and the third flow control valve 163 all perform a flow regulation function, and when an abnormal condition occurs or the temperature in the cavity of the corresponding distribution cabinet reaches a set value or below, the remaining and redundant high-temperature and high-pressure liquid freon needs to flow back to the condenser 11 through the first evaporator 141, the second evaporator 142 and the third evaporator 143, none of the first flow control valve 161, the second flow control valve 162 and the third flow control valve 163 performs the flow regulation function, the redundant high-temperature and high-pressure liquid freon can be rapidly pumped back under the reverse back pressure effect, thereby ensuring that the high-temperature and high-pressure liquid freon in the first evaporator 141, the second evaporator 142 and the third evaporator 143 can be effectively evacuated, and the cost of the first evaporator 141, the second evaporator 141 and the third evaporator 143 can be effectively reduced, and the cost of the evaporator 141 and the evaporator 143 can be effectively reduced.
Fig. 4 is a schematic structural diagram of a fourth embodiment of a room temperature control system according to the present invention, which is different from the second embodiment in that: a dust cover 2 is additionally arranged. The dust cover 2 covers the compressor 12, and is mainly composed of a support frame 21 and a filter net 22. The supporting frame 21 is formed by welding aluminum alloy section sections end to end, and is detachably fixed on the outer wall of the power distribution room through expansion bolts. The filter screen 22 is supported by the support frame 21, and the mesh number of the filter screen is controlled to be 80-120. Therefore, the dust content in the air around the compressor 12 can be effectively reduced, and further, a large amount of external dust is prevented from entering the interior of the first power distribution cabinet along the path of the compressor 12 → the condenser 11 → the first evaporator 141, or entering the interior of the second power distribution cabinet along the path of the compressor 12 → the condenser 11 → the second evaporator 142, or entering the interior of the third power distribution cabinet along the path of the compressor 12 → the condenser 11 → the third evaporator 143, so that the cleanliness of the pumped cold air is ensured, and the phenomenon that the heat of the power supply devices in the power distribution cabinets cannot be rapidly and instantly diffused due to the dust covering on the surfaces of the power supply devices in the power distribution cabinets is avoided.
Finally, it should be noted that, in the actual design construction, the structure of the room temperature control system of the power distribution cabinet can be adaptively adjusted according to the actual number of the power distribution cabinets disposed in the power distribution cabinet, and is not limited to the mesh number 3 defined in the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. A temperature control method of a power distribution room is realized by a temperature control system of the power distribution room; the power distribution room temperature control system is used for cooling a power distribution cabinet in a power distribution room, and a forced air draft unit is omitted and comprises a directional cold transmission unit; pumping cold energy towards a power distribution cabinet which is arranged in the power distribution room and is kept in an operating state simultaneously by the directional cold transmission unit; in unit time, according to the difference of actual heating value in the operation process of a single power distribution cabinet, the directional cold conveying unit adjusts the cold quantity pumped into the power distribution cabinet by the directional cold conveying unit;
assuming that the number of power distribution cabinets arranged in a power distribution room is N, the directional cooling unit comprises a condenser, a compressor, N branch pipelines and N evaporators; the condenser and the compressor are both arranged outside the power distribution room and cooperate with each other to generate high-temperature high-pressure liquid Freon; the evaporators are arranged in the power distribution cabinet in a one-to-one correspondence manner, and are communicated with the condenser by virtue of the branch pipelines corresponding to the evaporators; in the process that the high-temperature and high-pressure liquid Freon is vaporized due to the reduction of pressure, the evaporator can release cold energy towards the inner cavity of the corresponding power distribution cabinet;
the directional cooling unit also comprises N temperature sensors and a controller; the temperature sensors are arranged in the power distribution cabinets in a one-to-one correspondence manner so as to monitor the temperature value of the inner cavity of the power distribution cabinet in real time; the controller controls the amount of high-temperature high-pressure liquid Freon received by the evaporator in unit time in real time according to the temperature value fed back by the temperature sensor, and is characterized in that the evaporator comprises a high-conductivity cold shell; the high-conductivity cold shell is internally provided with a containing cavity for receiving and containing high-temperature and high-pressure liquid Freon; under the working state, at the moment that the high-temperature and high-pressure liquid Freon enters the accommodating cavity through the branch pipeline, the pressure applied to the high-temperature and high-pressure liquid Freon is sharply reduced, the high-temperature and high-pressure liquid Freon is vaporized, and the generated cold energy is exchanged with the heat of the inner cavity of the power distribution cabinet in a radiation cooling mode through the high cold guide shell; and a series of fins extend outwards from the outer wall of the high-conductivity cold shell;
the directional cold conveying unit also comprises N flow control valves which are respectively matched with the N branch pipelines in a one-to-one correspondence manner, and the flow control valves are one-way flow control valves;
in actual operation, when high-temperature high-pressure liquid Freon needs to be pumped into each evaporator from the condenser, the flow control valves play a role in flow regulation, when abnormal conditions occur or the temperature in the cavity of the corresponding power distribution cabinet reaches a set value or below, residual and redundant high-temperature high-pressure liquid Freon needs to respectively flow back to the condenser through each evaporator, the corresponding flow control valves do not play a role in flow regulation, and the redundant high-temperature high-pressure liquid Freon can be quickly pumped back under the reverse back pressure effect, so that the high-temperature high-pressure liquid Freon in each evaporator in a non-working state can be thoroughly emptied;
the controller comprises a numerical value calculation module and a numerical value judgment module; the artificial preset judgment threshold value of the numerical judgment module is delta; selecting any power distribution cabinet, and assuming that the ideal working temperature is T, monitoring the real-time temperature value in the selected power distribution cabinet by the temperature sensor to be T; the T is sent to the controller through a data bus in real time, T, T is calculated and judged through the numerical value calculation module and the numerical value judgment module, and when T-T is larger than or equal to delta, the evaporator arranged in the power distribution cabinet is continuously pumped into high-temperature high-pressure liquid Freon; as time progresses, when T-T < [ delta ], the evaporator arranged in the electrical distribution cabinet reduces the amount of high temperature and high pressure liquid freon it receives; continuing to advance along with time, when T is less than T-2, stopping receiving high-temperature and high-pressure liquid Freon by the evaporator arranged in the power distribution cabinet;
the flow control valve cooperates with the controller to control the amount of high temperature, high pressure liquid freon delivered via the condenser to the evaporator per unit time; aiming at the selected power distribution cabinet, when T-T is more than or equal to delta, the flow control valve is adjusted to be in a fully open state; when T-T <. Delta, calculating a ratio alpha of (2*t-T-delta)/2T, adjusting the flow control valve to be in a half-open state, and assuming that the flow rate of the high-temperature and high-pressure liquid Freon through the flow control valve in the half-open state is A and the flow rate through the flow control valve in a full-open state is B in unit time, A/B = alpha; as time continues to advance, the flow control valve is adjusted to a fully closed state when T < T-2.
2. The method of claim 1, further comprising a dust cover; the dust cover is used for protecting the compressor and is detachably fixed on the outer wall of the power distribution room.
3. The method for controlling the temperature of the power distribution room as claimed in claim 2, wherein the dust cover comprises a support frame and a filter screen; the supporting frame is detachably fixed on the outer wall of the power distribution room through expansion bolts; the filter screen is supported by the support frame, and the mesh number of the filter screen is controlled to be 80-120.
4. The method of room temperature control for power distribution according to claim 1, characterized in that Δ ≦ 10 ℃; t is less than or equal to 60 ℃.
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