CN112815420A - Energy-saving air conditioning unit for medium and large-sized power transformation and distribution room and control method thereof - Google Patents
Energy-saving air conditioning unit for medium and large-sized power transformation and distribution room and control method thereof Download PDFInfo
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- CN112815420A CN112815420A CN202110004480.9A CN202110004480A CN112815420A CN 112815420 A CN112815420 A CN 112815420A CN 202110004480 A CN202110004480 A CN 202110004480A CN 112815420 A CN112815420 A CN 112815420A
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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
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
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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
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
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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
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F5/0046—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 using natural energy, e.g. solar energy, energy from the ground
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B7/00—Enclosed substations, e.g. compact substations
- H02B7/06—Distribution substations, e.g. for urban network
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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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- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Power Engineering (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Sustainable Development (AREA)
- Thermal Sciences (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
The invention relates to an energy-saving air conditioning unit for a medium-sized and large-sized power transformation and distribution room and a control method thereof. The air conditioning unit is internally provided with the air exhaust section and the fresh air section, and the air exhaust electric air valve, the fresh air electric air valve and the return air electric air valve are correspondingly configured, the air valves are controlled by the PLC control system to be switched on and off, so that the full fresh air working condition and the full return air working condition of the air conditioning system can be switched, the outdoor fresh air is fully utilized to cool the power transformation and distribution space, meanwhile, the frequency conversion and start-stop control are carried out on the air returning fan of the air conditioning unit and the refrigerating unit, the operation mode is automatically optimized, the indoor temperature and the indoor air quality are guaranteed, and the energy consumption is reduced.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an energy-saving air conditioning unit for a medium-large power transformation and distribution room and a control method thereof.
Background
Because the electrical equipment in the transformer substation is many, calorific capacity is big, and incessant operation all the year round, if the indoor temperature is too high will directly influence production safety, therefore air conditioning unit's setting is indispensable.
At present, two independent systems of unit type split air conditioners and mechanical ventilation are generally arranged in a power transformation and distribution room. The mechanical ventilation energy consumption is low, but the temperature cannot be effectively controlled, the outdoor air quality in many regions of China is poor, and the indoor air quality is influenced by wind, sand and haze; the unit type split air conditioner can ensure the temperature and the indoor air quality, but has large operation energy consumption and poor economical efficiency. In actual operation, because the distribution room is mostly unattended, be difficult to switch two sets of systems according to actual conditions, a large amount of medium and large-scale distribution rooms all adopt the mode of unit formula split air conditioner operation all the year, and its operation energy consumption is huge.
Therefore, a set of air conditioning system which is energy-saving, can ensure the indoor air quality and can be fully automatically switched without manual operation has better application value for the type of buildings.
Disclosure of Invention
The invention provides an energy-saving air conditioning unit for a medium-sized and large-sized power transformation and distribution room and a control method thereof.
The invention provides an energy-saving air conditioning unit for a medium and large-sized power transformation and distribution room, which comprises an air conditioning unit, a direct evaporation type refrigerating unit and a PLC control system;
the air conditioning unit comprises an air return section, an air return fan section, an air exhaust section, a fresh air section, a primary effect filtering section, a surface cooling section, an air feeder section, a medium effect filtering section and an air outlet section which are connected in sequence;
the air return section is provided with an air return machine, the outlet of the air exhaust section is provided with an air exhaust electric air valve, the inlet of the fresh air section is provided with a fresh air electric air valve, a return air electric air valve is arranged between the air exhaust section and the fresh air section, the primary effect filtering section is provided with a primary effect filter, the surface cooling section is provided with a surface cooler, the air feeder section is provided with an air feeder, and the intermediate effect filtering section is provided with an intermediate effect filter;
the refrigerating unit comprises a condenser, a compressor and an outdoor fan, wherein the compressor is connected with the surface cooler of the surface cooling section through a pipeline;
the PLC control system controls the exhaust electric air valve, the fresh air electric air valve, the return fan of the air conditioning unit, the blower of the air conditioning unit and the refrigerating unit and simultaneously receives signals of an indoor temperature sensor and an outdoor temperature sensor.
Furthermore, the air return fan of the air conditioning unit is a brushless direct current fan, the brushless direct current air return fan can be subjected to frequency conversion and is installed on a fan wall, at least two fans are connected in parallel, and one fan is standby.
Furthermore, the blower of the air conditioning unit is a brushless direct current blower, the brushless direct current blower can be subjected to frequency conversion and is installed on a blower wall, at least two blowers are connected in parallel, and one blower is standby.
Furthermore, the compressor of the refrigerating unit adopts a variable frequency motor and is controlled by the PLC control system.
The second aspect of the invention is to provide the control method of the energy-saving air conditioning unit, which comprises the steps of controlling the on-off of the air exhaust electric air valve, the fresh air electric air valve and the return air electric air valve through the PLC control system, and realizing the switching of a fresh air working condition and a full return air working condition of the air conditioning system; and the PLC control system is used for carrying out frequency conversion and start-stop control on the air feeder, the air return fan and the refrigerating unit of the air conditioning unit, automatically optimizing the operation mode and reducing the energy consumption.
Furthermore, the PLC control system controls the on-off of the exhaust electric air valve, the fresh air electric air valve and the return air electric air valve, and the PLC control system comprises the following concrete steps:
the PLC control system judges whether the outdoor air temperature is lower than the indoor design temperature of the power transformation and distribution room or not by receiving an outdoor temperature sensor signal, if so, the fresh air electric air valve and the exhaust electric air are opened, the return air electric air valve is closed, and a full fresh air operation mode is adopted; if not, the fresh air electric air valve and the exhaust electric air valve are closed, the return air electric air valve is opened, and a full return air operation mode is adopted.
Further, through the PLC control system to the forced draught blower of air conditioning unit, return air machine with refrigerating unit carries out frequency conversion and opens and stop control, concrete step as follows:
when the refrigerating unit is started, the PLC control system judges whether the indoor temperature of the power transformation and distribution room is lower than the design temperature or not by receiving signals of an indoor temperature sensor, and if so, gradually reducing the frequency of a compressor of the refrigerating unit until the compressor is closed; if not, increasing the frequency of the compressor of the refrigerating unit;
when the refrigerating unit is closed, the PLC control system judges whether the indoor temperature of the power transformation and distribution room is lower than the design temperature or not by receiving the signal of the indoor temperature sensor, and if so, gradually closing the frequency of a fan feeding/returning of the air conditioning unit until the preset lowest frequency is reached; if not, increasing the frequency of the air supply/return fan until the power frequency, and if the indoor temperature of the air supply/return fan is still higher than the design temperature when the power frequency runs, starting the refrigerating unit.
By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:
the air conditioning unit is internally provided with the air exhaust section and the fresh air section, and the air exhaust electric air valve, the fresh air electric air valve and the return air electric air valve are correspondingly configured, so that the switching between the full fresh air working condition and the full return air working condition of the air conditioning system can be realized through the PLC control system, the outdoor fresh air is fully utilized to cool the power transformation and distribution room, meanwhile, the frequency conversion and start-stop control are carried out on the return fan of the air conditioning unit and the refrigerating unit, the operation mode is automatically optimized, the indoor temperature and the indoor air quality are ensured, and the energy consumption is reduced.
Drawings
FIG. 1 is a schematic diagram of an energy-saving air conditioning unit for a medium-large power transformation and distribution room according to the invention;
FIG. 2 is a logic diagram of the opening and closing of the electric air valve for air exhaust, the electric air valve for fresh air and the electric air valve for return air according to the present invention;
FIG. 3 is a logic diagram of start-stop and frequency conversion for the air conditioning unit and the refrigeration unit of the present invention;
wherein the reference numerals are:
1-return air section, 2-return air fan section, 3-exhaust air section, 4-fresh air section, 5-primary effect filter section, 6-surface cooling section, 7-blower section, 8-intermediate effect filter section, 9-outlet air section, 10-return air fan, 11-exhaust electric air valve, 12-fresh air electric air valve, 13-return air electric air valve, 14-primary effect filter, 15-surface cooler, 16-blower, 17-intermediate effect filter, 18-refrigerating unit, 19-PLC control system, 20-indoor dry bulb temperature sensor and 21-outdoor dry bulb temperature sensor.
Detailed Description
The present invention will be further described with reference to the following detailed description and accompanying drawings, which are not intended to limit the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Examples
As shown in fig. 1, the present embodiment provides an energy-saving air conditioning unit for a medium-large transformer substation, which includes an air conditioning unit, a direct evaporative type refrigeration unit 18 and a PLC control system 19;
the air conditioning unit comprises an air return section 1, an air return fan section 2, an air exhaust section 3, a fresh air section 4, a primary effect filtering section 5, a surface cooling section 6, an air feeder section 7, a medium effect filtering section 8 and an air outlet section 9 which are sequentially connected;
the air return section is provided with an air return machine 10, the outlet of the air exhaust section is provided with an air exhaust electric air valve 11, the inlet of the fresh air section is provided with a fresh air electric air valve 12, a return air electric air valve 13 is arranged between the air exhaust section and the fresh air section, the primary effect filtering section is provided with a primary effect filter 14, the surface cooling section is provided with a surface air cooler 15, the air feeder section is provided with an air feeder 16, and the intermediate effect filtering section is provided with an intermediate effect filter 17;
the refrigerating unit 18 comprises a condenser, a compressor and an outdoor fan, wherein the compressor is connected with the surface cooler 15 of the surface cooling section through a pipeline, and the pipeline is provided with an electromagnetic valve, a drying filter, a liquid viewing mirror and an electronic expansion valve; the compressor of the refrigerating unit adopts a variable frequency motor;
the PLC control system 19 controls the exhaust electric air valve 11, the fresh air electric air valve 12, the return electric air valve 13, the return fan 10, the blower 16, and the refrigeration unit 18, and receives signals from the indoor temperature sensor 20 and the outdoor temperature sensor 21.
In a preferred embodiment, the air conditioner unit return fan 10 and the air conditioner unit blower 16 are brushless dc fans, which are frequency-variable and mounted on the fan wall, and at least two of the brushless dc fans are connected in parallel, one of the brushless dc fans being on standby.
Referring to fig. 2, this embodiment also provides the open and close logic of the electronic blast gate of airing exhaust, the electronic blast gate of new trend and the electronic blast gate of return air, and the switching control of the electronic blast gate of above-mentioned airing exhaust, the electronic blast gate of new trend and the electronic blast gate of return air through the PLC control system realizes the switching of the brand-new wind operating mode of air conditioning system and the operating mode of full return air:
the PLC control system 19 judges whether the outdoor air temperature is lower than the indoor design temperature of the power transformation and distribution room or not by receiving the signal of the outdoor temperature sensor 21, if so, the exhaust electric air valve 11 and the fresh air electric air valve 12 are opened, the return air electric air valve 13 is closed, and the operation mode of fresh air is adopted; if not, the air exhaust electric air valve 11 and the fresh air electric air valve 12 are closed, the return air electric air valve 13 is opened, and a full return air operation mode is adopted.
Through the control logics of the exhaust electric air valve 11, the fresh air electric air valve 12 and the return air electric air valve 13 and the control logics of the air conditioning unit and the refrigerating unit, different combined operation strategies are realized, and the energy-saving effect is achieved. There are several main modes, as shown in table 1:
TABLE 1
Continuing to refer to fig. 3, this embodiment still provides start-stop and frequency conversion logic of air conditioning unit and refrigerating unit, carries out frequency conversion and opens and stop control, automatic optimization operational mode, reduction energy consumption to above-mentioned air conditioning unit's forced draught blower, return air machine and above-mentioned refrigerating unit through PLC control system:
the PLC control system 19 determines whether the refrigeration unit 18 is on by monitoring the on state of the refrigeration unit 18. If so, further detecting whether the indoor temperature is lower than the design temperature through the indoor dry bulb temperature sensor 20, and if so, gradually turning off the compressor frequency of the refrigerating unit 13 until the refrigerating unit is turned off. If the indoor temperature is greater than the design temperature, the compressor frequency of the refrigeration unit 18 is increased.
If the refrigerating unit 18 is not started, the indoor dry bulb temperature sensor 20 is used for further detecting whether the indoor temperature is lower than the design temperature, and if so, gradually turning off the frequency of a blower and a return fan of the air conditioning unit until the minimum frequency is reached. And if the indoor temperature is higher than the design temperature, raising the frequency of the air feeder and the air return fan until the power frequency is reached. If the indoor temperature is still greater than the design temperature when the air supply/return fan operates at power frequency, the refrigerating unit 18 is started.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. An energy-saving air conditioning unit for a medium-sized and large-sized power transformation and distribution room is characterized by comprising an air conditioning unit, a direct evaporation type refrigerating unit and a PLC control system;
the air conditioning unit comprises an air return section, an air return fan section, an air exhaust section, a fresh air section, a primary effect filtering section, a surface cooling section, an air feeder section, a medium effect filtering section and an air outlet section which are connected in sequence;
the air return section is provided with an air return machine, the outlet of the air exhaust section is provided with an air exhaust electric air valve, the inlet of the fresh air section is provided with a fresh air electric air valve, a return air electric air valve is arranged between the air exhaust section and the fresh air section, the primary effect filtering section is provided with a primary effect filter, the surface cooling section is provided with a surface cooler, the air feeder section is provided with an air feeder, and the intermediate effect filtering section is provided with an intermediate effect filter;
the direct evaporation type refrigerating unit comprises a condenser, a compressor and an outdoor fan, wherein the compressor is connected with a surface cooler of the surface cooling section through a pipeline;
the PLC control system controls the exhaust electric air valve, the fresh air electric air valve, the return fan of the air conditioning unit, the blower of the air conditioning unit and the refrigerating unit and simultaneously receives signals of an indoor temperature sensor and an outdoor temperature sensor.
2. The energy-saving air conditioning unit as claimed in claim 1, wherein the air return fan of the air conditioning unit is a brushless dc fan, the brushless dc fan is variable-frequency and is installed on a fan wall, at least two of the brushless dc fans are connected in parallel, and one of the brushless dc fans is standby.
3. The energy saving air conditioning unit of claim 1, wherein the blower of the air conditioning unit is a brushless dc fan, the brushless dc fan is variable frequency and is mounted on a fan wall, and at least two of the brushless dc fans are connected in parallel, one of the brushless dc fans is standby.
4. The energy-saving air conditioning unit as claimed in claim 1, wherein the compressor of the refrigerating unit is an inverter motor and is controlled by the PLC control system.
5. A control method of the energy-saving air conditioning unit according to any one of claims 1 to 4, characterized by comprising the steps of controlling the on-off of the exhaust electric air valve, the fresh air electric air valve and the return air electric air valve through the PLC control system to realize the switching of a fresh air working condition and a full return air working condition of the air conditioning system; and the PLC control system is used for carrying out frequency conversion and start-stop control on the air feeder, the air return fan and the refrigerating unit of the air conditioning unit, automatically optimizing the operation mode and reducing the energy consumption.
6. The control method according to claim 5, wherein the PLC control system controls the on-off of the exhaust electric air valve, the fresh air electric air valve and the return air electric air valve by the following steps:
the PLC control system judges whether the outdoor air temperature is lower than the indoor design temperature of the power transformation and distribution room or not by receiving an outdoor temperature sensor signal, if so, the fresh air electric air valve and the exhaust electric air are opened, the return air electric air valve is closed, and a full fresh air operation mode is adopted; if not, the fresh air electric air valve and the exhaust electric air valve are closed, the return air electric air valve is opened, and a full return air operation mode is adopted.
7. The control method according to claim 5, wherein the PLC control system is used for controlling the frequency conversion and the start and stop of a blower, a return air fan and the refrigerating unit of the air conditioning unit, and the control method comprises the following specific steps:
when the refrigerating unit is started, the PLC control system judges whether the indoor temperature of the power transformation and distribution room is lower than the design temperature or not by receiving signals of an indoor temperature sensor, and if so, gradually reducing the frequency of a compressor of the refrigerating unit until the compressor is closed; if not, increasing the frequency of the compressor of the refrigerating unit;
when the refrigerating unit is closed, the PLC control system judges whether the indoor temperature of the power transformation and distribution room is lower than the design temperature or not by receiving the signal of the indoor temperature sensor, and if so, gradually closing the frequency of a fan feeding/returning of the air conditioning unit until the preset lowest frequency is reached; if not, increasing the frequency of the air supply/return fan until the power frequency, and if the indoor temperature of the air supply/return fan is still higher than the design temperature when the power frequency runs, starting the refrigerating unit.
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| CN202110004480.9A CN112815420A (en) | 2021-01-04 | 2021-01-04 | Energy-saving air conditioning unit for medium and large-sized power transformation and distribution room and control method thereof |
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| CN202110004480.9A CN112815420A (en) | 2021-01-04 | 2021-01-04 | Energy-saving air conditioning unit for medium and large-sized power transformation and distribution room and control method thereof |
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| CN106322595A (en) * | 2016-08-18 | 2017-01-11 | 深圳市共济科技股份有限公司 | Refrigeration and dehumidification system, refrigeration and dehumidification method and refrigeration and dehumidification air conditioner for data centres |
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Application publication date: 20210518 |