CN114704923A - Energy-saving base station air conditioning system with multiple operation modes - Google Patents
Energy-saving base station air conditioning system with multiple operation modes Download PDFInfo
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- CN114704923A CN114704923A CN202210515491.8A CN202210515491A CN114704923A CN 114704923 A CN114704923 A CN 114704923A CN 202210515491 A CN202210515491 A CN 202210515491A CN 114704923 A CN114704923 A CN 114704923A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 56
- 239000003507 refrigerant Substances 0.000 claims abstract description 27
- 238000005057 refrigeration Methods 0.000 claims abstract description 14
- 238000010521 absorption reaction Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 claims description 2
- 238000009833 condensation Methods 0.000 claims 1
- 230000005494 condensation Effects 0.000 claims 1
- 210000002445 nipple Anatomy 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000007664 blowing Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- F24F11/65—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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
- F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
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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
- F24F3/044—Systems in which all treatment is given in the central station, i.e. all-air systems
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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
- F24F7/00—Ventilation
- F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
- F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
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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
- F24F3/044—Systems in which all treatment is given in the central station, i.e. all-air systems
- F24F2003/0446—Systems in which all treatment is given in the central station, i.e. all-air systems with a single air duct for transporting treated air from the central station to the rooms
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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)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an energy-saving base station air conditioning system with multiple operation modes, which can be structurally divided into an air inlet area, an air return area and an outdoor area and comprises an air flow path and a refrigerant loop; the air flow path comprises a blower, an air supply box, a plurality of air supply outlets, a plurality of air outlets, an air exhaust air door, a return air door and a fresh air door; the air feeder is a centrifugal fan and is arranged in an air inlet area at the upper part of the unit; in the technical scheme, the unit can run in an external circulation forced cooling mode, absorbs heat to outdoor fresh air through the evaporator and reduces the temperature of the outdoor fresh air to a preset air supply temperature. This mode has utilized the outdoor new trend that is lower than indoor return air temperature, has practiced thrift refrigerating system's energy consumption. Meanwhile, as the starting conditions of the mode are met in most of the whole year, compared with the traditional method for carrying out heat absorption and cooling on the return air with high enthalpy, the method can fully utilize the fresh air cooling capacity to reduce the running time of the refrigeration system, and has obvious energy-saving effect all year around.
Description
Technical Field
The invention relates to a base station air conditioning system, in particular to an energy-saving base station air conditioning system with multiple operation modes.
Background
With the rapid development of the communication business of China, the number and the scale of base stations are rapidly expanding. Because the heat dissipation capacity of the base station equipment is large and highly concentrated, uninterrupted cooling is required all the year around to ensure the normal operation of the base station. Therefore, as a basis for guaranteeing the normal operation of the base station equipment, the base station air conditioner is very important in the base station construction.
At present, a cabinet air conditioner is generally used in places such as an outdoor cabinet and an outdoor base station to cool internal equipment of the cabinet air conditioner, so that stable operation of electrical elements and the like in the cabinet is ensured. However, the traditional cabinet air conditioner is single in control, cannot adjust the refrigeration mode according to the change of the external environment temperature, still undertakes the refrigeration task in winter with lower outdoor temperature, wastes the natural cold source of outdoor cold air, and does not accord with the energy-saving economical principle of unit operation. Meanwhile, when the ambient temperature is relatively low, the condensing pressure of the condenser is often very low, so that the expansion valve cannot obtain enough pressure drop at the two ends of the expansion valve, and the refrigerant obtained by the evaporator is small, so that the fault of the refrigeration system is frequent. The existing fresh air energy-saving technology can directly utilize outdoor low-temperature cold air as a cold source to be introduced into a room, and free cold energy is provided for base station equipment.
Patent CN215582360U proposes an air conditioner and fresh air all-in-one machine structure, which comprises a compressor, an evaporator, a filter screen, an air door mechanism, an inner fan, a control panel, a condenser and an outer fan. When the outdoor environment temperature is lower, a ventilation mode can be adopted to utilize a natural cold source for cooling, so that the refrigeration power consumption of the base station is reduced, the operation cost of the base station is reduced, and the economic benefit is increased. However, the ventilation mode in the patent is started only when the outdoor temperature is low, the energy-saving potential in a transition season is neglected, the annual available time is short, and the energy-saving effect is not obvious. And this ventilation mode directly utilizes the cold volume in the outdoor low temperature new trend to cool down equipment in the rack, because outdoor ambient temperature constantly changes, the operating stability of equipment in the unit is difficult to guarantee.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an energy-saving base station air conditioning system with multiple operation modes, which can fully utilize the cold energy of fresh air to reduce the operation time of a refrigeration system, realize the optimal operation energy saving of a base station, and can also utilize natural cooling to solve the problem of base station cooling caused by the incapability of operating the refrigeration system in a low-temperature environment.
The purpose of the invention can be realized by the following technical scheme:
the invention relates to an energy-saving base station air conditioning system with multiple operation modes, which can be structurally divided into an air inlet area, an air return area and an outdoor area and comprises an air flow path and a refrigerant loop;
the air flow path comprises a blower, an air supply box, a plurality of air supply outlets, a plurality of air outlets, an air exhaust air door, a return air door and a fresh air door;
furthermore, the blower is a centrifugal fan and is arranged in an air inlet area at the upper part of the unit;
the air supply box is a cuboid air supply channel and is horizontally attached to the upper parts of the backs of the plurality of side-by-side cabinets, and the three cabinets are taken as an example and are respectively a first cabinet, a second cabinet and a third cabinet;
furthermore, the installation height of the air supply box is consistent with that of the air supply machine, and the air outlet position of the air supply machine and the air inlet of the air supply box are on the same horizontal line, so that the air inlet resistance can be reduced;
furthermore, the attachment joints of the air supply box and the first cabinet, the second cabinet and the third cabinet are respectively provided with a first air supply outlet, a second air supply outlet and a third air supply outlet, and cold air in the air supply box is sequentially and vertically fed into each cabinet through the air supply outlets;
furthermore, the first air supply outlet, the second air supply outlet and the third air supply outlet can adjust the air supply quantity in each cabinet through air valves, so that the temperature in each cabinet can be accurately controlled;
furthermore, the bottoms of the first cabinet, the second cabinet and the third cabinet are respectively provided with a first air outlet, a second air outlet and a third air outlet, and the cabinets are communicated with one another through the air outlets;
furthermore, the air exhaust air door is arranged at the joint between the air return area and the outdoor area, and whether the air return area is communicated with the outdoor area or not is realized through the opening and closing of the air exhaust air door;
furthermore, the return air door is arranged at the joint between the air inlet area and the return air area, and the return air quantity entering the air inlet area is controlled by adjusting the opening of an air valve on the return air door;
furthermore, the fresh air door is arranged on the side surface of the air inlet area above the unit, and the opening of the air valve on the fresh air door is adjusted to control the fresh air quantity entering the air inlet area;
furthermore, the return air door and the fresh air door are air doors with adjustable opening degrees, and the exhaust air door is a switch type air door;
furthermore, a first temperature sensor and a second temperature sensor are respectively arranged at the return air door and the fresh air door, so that the temperature of indoor return air and outdoor fresh air can be monitored.
Furthermore, a filter device is arranged at the inlet of the fresh air door and is used for filtering outdoor fresh air;
the refrigerant loop comprises a compressor, a condenser, a throttling device and an evaporator which are connected in sequence;
the compressor, the condenser and the throttling device are arranged in an outdoor area, and the evaporator is arranged in an air inlet area;
further, an outdoor fan is arranged between the condenser and the unit shell, and the outdoor fan is an axial flow fan;
furthermore, the evaporator is obliquely arranged below the air feeder in the air inlet area at a certain angle, and the upper end of the evaporator is fixed with a horizontal metal plate;
furthermore, a control cabinet is arranged on the inner surface of the unit shell above the evaporator;
furthermore, a first temperature pressure sensor and a second temperature pressure sensor are respectively arranged on the air suction and exhaust pipeline of the compressor and used for monitoring the air suction state and the air exhaust state of the compressor;
furthermore, a third temperature sensor is arranged near the blower of the air inlet area and used for monitoring the air supply temperature in the air inlet area;
first supply-air outlet, second supply-air outlet, third supply-air outlet, return air door and new trend air door among this technical scheme are the air door of adjustable aperture, and the air door of airing exhaust is switch type air door.
The throttling device in the technical scheme is one of a capillary tube, a throttling short tube or an electronic expansion valve, and the electronic expansion valve is preferably selected in the technical scheme in order to facilitate the realization of automatic control.
Through opening and closing of air door and opening and stop of compressor, this technical scheme mainly can realize following 3 kinds of operational modes:
1. internal circulation forced cooling mode:
the state of the component: the air exhaust door and the fresh air door are closed, the return air door is opened, and the air valves on the first air supply outlet, the second air supply outlet and the third air supply outlet respectively adjust the opening degree of each air supply outlet according to the thermal load conditions in the first cabinet, the second cabinet and the third cabinet. The compressor is started, the refrigeration cycle loop is in a working state, the throttling device controls the superheat degree of the system, and the blower and the outdoor fan are both started.
Refrigerant flow path state: the refrigerant in the evaporator is evaporated and absorbs heat to become refrigerant gas, which is sucked by the suction inlet of the compressor and compressed into high-temperature and high-pressure refrigerant gas, and then the refrigerant gas enters the condenser to be condensed and release heat, and then is throttled by the throttling device to become a gas-liquid two-phase state, and finally returns to the evaporator.
Air flow path state: the high-temperature air in the first cabinet, the second cabinet and the third cabinet sequentially flows into the air return area through the third air outlet, the second air outlet and the first air outlet, then enters the air inlet area through the air return air door, is cooled through the evaporator to form low-temperature air, then is sent into the air supply box through the air feeder, the low-temperature air sequentially passes through the first air supply outlet, the second air supply outlet and the third air supply outlet in the air supply box, a certain amount of cold air is vertically sent into the first cabinet, the second cabinet and the third cabinet according to the opening degree of each air supply outlet, and the low-temperature air forms the high-temperature air again after being radiated by the absorption equipment in each cabinet. Meanwhile, under the action of the outdoor fan, outdoor air in the outdoor area is discharged outdoors after absorbing heat through the condenser.
2. External circulation forced cooling mode:
the component state: the air exhaust door is opened, the fresh air door is opened, and the return air door is closed. The other component states are the same as the internal circulation forced cooling mode.
The refrigerant flow path state is the same as the internal circulation forced cooling mode.
Air flow path state: the high-temperature air in the first cabinet, the second cabinet and the third cabinet sequentially flows into the return air area through the third air outlet, the second air outlet and the first air outlet, and then enters the outdoor area through the air exhaust door. Under the action of the outdoor fan, the indoor return air and the outdoor air in the outdoor area are discharged outdoors after absorbing heat through the condenser. Outdoor fresh air enters an air inlet area through a fresh air door, is cooled through an evaporator to form low-temperature air, is sent into an air supply box through an air feeder, the low-temperature air sequentially passes through a first air supply outlet, a second air supply outlet and a third air supply outlet in the air supply box, a certain amount of cold air is sequentially and vertically sent into a first cabinet, a second cabinet and a third cabinet according to the opening degree of each air supply outlet, and the low-temperature air forms high-temperature air again after being radiated by absorption equipment in each cabinet.
3. External circulation natural cooling mode:
the state of the component: and the air exhaust air door, the fresh air door and the return air door are all opened, and the opening of the fresh air door and the opening of the return air door are adjusted according to the air mixing temperature in the air inlet area. And the air valves on the first air supply outlet, the second air supply outlet and the third air supply outlet respectively adjust the opening of each air supply outlet according to the thermal load conditions in the first cabinet, the second cabinet and the third cabinet. The compressor is turned off and the refrigeration cycle is not operating. The blower is turned on and the outdoor fan is turned off.
Air flow path state: high-temperature air in first rack, second rack and the third rack is in proper order via third air outlet, second air outlet and first air outlet inward-remittance district, and later indoor return air divide into two parts: one part enters the outdoor area through the air exhaust damper and is finally exhausted into the outdoor environment; the other part of the air enters an air inlet area through a return air door, meanwhile, outdoor fresh air enters the air inlet area through a fresh air door, indoor return air and outdoor fresh air are mixed and then cooled through an evaporator to form low-temperature air, then the low-temperature air is sent into an air supply box through a blower, the low-temperature air sequentially passes through a first air supply opening, a second air supply opening and a third air supply opening in the air supply box, a certain amount of cold air is vertically sent into the first cabinet, the second cabinet and the third cabinet according to the opening degree of each air supply opening, and the low-temperature air forms high-temperature air again after being radiated by absorption equipment in each cabinet.
In combination with the above modes, the switching mode between the modes in different scenes of the present invention is as follows:
when the outdoor fresh air temperature monitored by the second temperature sensor is greater than or equal to the indoor return air temperature monitored by the first temperature sensor, the unit starts an internal circulation forced cooling mode at the moment;
when the outdoor fresh air temperature monitored by the second temperature sensor is higher than the preset air supply temperature of the unit and lower than the indoor return air temperature monitored by the first temperature sensor, the unit starts an external circulation forced cooling mode;
when the outdoor fresh air temperature monitored by the second temperature sensor is less than or equal to the preset air supply temperature of the unit, the unit starts an external circulation natural cooling mode at the moment;
the invention relates to an energy-saving base station air conditioning system with multiple operation modes, which structurally has the following characteristics and innovation points:
1. be equipped with return air door and new trend air door of aperture adjustable: under the extrinsic cycle natural cooling mode, adjust return air door and new trend air door aperture size according to mixing the wind temperature size in the air inlet district for mix the wind in the air inlet district and can maintain throughout and predetermine the air supply temperature, be favorable to the steady operation of equipment in the rack.
2. The first air supply outlet, the second air supply outlet and the third air supply outlet with adjustable opening degrees are arranged, the opening degree of each air supply outlet is adjusted according to the heat load conditions in the first cabinet, the second cabinet and the third cabinet, and the optimal distribution of the cooling capacity in the cabinets can be realized.
3. The first temperature sensor and the second temperature sensor are arranged, so that the temperature values of the indoor fresh air and the outdoor return air can be monitored, and a criterion is provided for switching the unit modes.
4. The evaporator is obliquely arranged, so that the collection of condensed water is facilitated.
Compared with the prior art, the invention has the following advantages:
in the technical scheme, the unit can run in an external circulation forced cooling mode, absorbs heat to outdoor fresh air through the evaporator and reduces the temperature of the outdoor fresh air to a preset air supply temperature. This mode has utilized the outdoor new trend that is lower than indoor return air temperature, has practiced thrift refrigerating system's energy consumption. Meanwhile, as the starting conditions of the mode are met in most of the whole year, compared with the traditional method for carrying out heat absorption and cooling on the return air with high enthalpy, the method can fully utilize the fresh air cooling capacity to reduce the running time of the refrigeration system, and has obvious energy-saving effect all year around.
According to the technical scheme, the unit can operate in an external circulation natural cooling mode, the opening degrees of the fresh air door and the return air door are adjusted according to the mixed air temperature in the air inlet area, and the outdoor low-temperature fresh air and the indoor high-temperature return air are mixed in different proportions, so that the mixed air in the air inlet area is always maintained at a preset air supply temperature value, the air supply temperature in the cabinet is basically kept unchanged, and compared with the traditional method that the cabinet is cooled by directly utilizing the outdoor fresh air, the method is more beneficial to stable operation of equipment in the cabinet.
Drawings
Fig. 1 is a schematic structural diagram of an energy-saving base station air conditioning system having multiple operation modes according to the present invention;
fig. 2 to 4 are schematic flow diagrams of an energy-saving base station air conditioning system with multiple operation modes according to the present invention, including an internal circulation forced cooling mode, an external circulation forced cooling mode, and an external circulation natural cooling mode;
in the figure: 1-a blow box, 2-a first blow port, 3-a second blow port, 4-a third blow port, 5-a first air valve, 6-a second air valve, 7-a third air valve, 8-a first air outlet, 9-a second air outlet, 10-a third air outlet, 11-a blower, 12-a control cabinet, 13-a sheet metal, 14-an evaporator, 15-a fresh air door, 16-a return air door, 17-a fresh air valve, 18-a return air valve, 19-a first temperature sensor, 20-a second temperature sensor, 21-an exhaust air door, 22-25-a connecting pipe, 26-a second temperature pressure sensor, 27-a first temperature pressure sensor, 28-a compressor, 29-a condenser and 30-a throttling device, 31-outdoor fan, 32-air inlet area, 33-air return area, 34-first cabinet, 35-second cabinet, 36-third cabinet, 37-outdoor area, 38-third temperature sensor.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
In this embodiment, an energy-saving base station air conditioning system with multiple operation modes has a structure shown in fig. 1, and includes a blowing box 1, a first blowing port 2, a second blowing port 3, a third blowing port 4, a first air valve 5, a second air valve 6, a third air valve 7, a first air outlet 8, a second air outlet 9, a third air outlet 10, a blower 11, a control cabinet 12, a metal plate 13, an evaporator 14, a fresh air door 15, a return air door 16, a fresh air valve 17, a return air valve 18, a first temperature sensor 19, a second temperature sensor 20, an exhaust air door 21, connecting pipes 22 to 25, a second temperature and pressure sensor 26, a first temperature and pressure sensor 27, a compressor 28, a condenser 29, a throttling device 30, an outdoor fan 31, an air inlet area 32, a return air area 33, a first cabinet 34, a second cabinet 35, a third cabinet 36, and an outdoor area 37.
The structure of the present embodiment can be divided into an air inlet area 32, an air return area 33 and an outdoor area 37, including an air flow path and a refrigerant loop; the air flow path comprises a blower 11, an air supply box 1, a plurality of air supply outlets 2-4, a plurality of air outlets 8-10, an exhaust air door 21, a return air door 16 and a fresh air door 15; the refrigerant loop is formed by sequentially connecting a compressor 28, a connecting pipe 22, a condenser 29, a connecting pipe 23, a throttling device 30, a connecting pipe 24 and a connecting pipe 25 of the evaporator 14 in sequence;
in the embodiment, the blower 11 is arranged in the air inlet area 32 at the upper part of the unit, the air supply box 1 is horizontally attached and arranged at the upper part of the back surfaces of the cabinets 34-36 which are arranged side by side, and the installation height is consistent with that of the blower 11. Air supply outlets 2-4 are arranged at the attachment joints of the air supply box 1 and the cabinets 34-36, and cold air in the air supply box 1 is sequentially and vertically sent into the cabinets 34-36 through the air supply outlets 2-4. The bottom of the cabinet 34-36 is provided with air outlets 8-10 for communicating the cabinets 34-36 with each other. The air exhaust damper 21 is arranged at the joint between the air return area 33 and the outdoor area 37, the air return damper 16 is arranged at the joint between the air intake area 32 and the air return area 33, and the fresh air damper 15 is arranged at the side of the air intake area 32 above the unit. Meanwhile, a first temperature sensor 19 and a second temperature sensor 20 are respectively arranged at the return air door 16 and the fresh air door 15.
In this embodiment, the compressor 28, the condenser 29 and the throttling device 30 are disposed in the outdoor area 37, and the evaporator 14 is disposed in the intake area 32. Meanwhile, an outdoor fan 31 is arranged between the condenser 29 and the unit shell, the evaporator 14 is obliquely arranged below the blower 11 in the air inlet area 32 at a certain angle, the upper end of the evaporator 14 is fixed with a horizontal sheet metal 13, the control cabinet 12 is arranged on the inner surface of the unit shell above the evaporator 14, and a first temperature and pressure sensor 27 and a second temperature and pressure sensor 26 are respectively arranged on the air suction pipeline 25 and the exhaust pipeline 22 of the compressor 28.
This unit passes through the opening and closing of air door and the start and stop of compressor 28, can realize following 3 kinds of operational modes:
first, internal circulation forced cooling mode (see fig. 2)
The starting conditions of the internal circulation forced cooling mode contained in the unit of the embodiment are as follows: when the outdoor fresh air temperature monitored by the second temperature sensor 20 is greater than or equal to the indoor return air temperature monitored by the first temperature sensor 19, the unit starts an internal circulation forced cooling mode.
In the internal circulation forced cooling mode of the unit of the embodiment, the component states are as follows: the exhaust air door 21 and the fresh air door 15 are closed, the return air door 16 is opened, and the air valves 5-7 on the first air supply outlet 2, the second air supply outlet 3 and the third air supply outlet 4 respectively adjust the opening degree of each air supply outlet 2-4 according to the heat load conditions in the first machine cabinet 34, the second machine cabinet 35 and the third machine cabinet 36. The compressor 28 is turned on, the refrigeration cycle is in a working state, the throttle device 30 controls the degree of superheat of the system, and the blower 11 and the outdoor fan 31 are both turned on.
In the internal circulation forced cooling mode of the unit of the embodiment, the states of the refrigerant flow path are as follows: the refrigerant in the evaporator 14 evaporates to absorb heat and turns into refrigerant gas, which is sucked by the suction port of the compressor 28 and compressed into refrigerant gas of high temperature and high pressure, and then enters the condenser 29 to be condensed and release heat, and then is throttled by the throttle device 30 to turn into a gas-liquid two-phase state, and finally returns to the evaporator 14.
In the internal circulation forced cooling mode of the unit of this embodiment, the air flow path state is as follows: the high-temperature air in the first cabinet 34, the second cabinet 35 and the third cabinet 36 is sequentially gathered into the return air area 33 through the third air outlet 10, the second air outlet 9 and the first air outlet 8, then enters the air intake area 32 through the return air damper 16, is cooled by the evaporator 14 to form low-temperature air, and then is sent into the air supply box 1 through the blower 11, the low-temperature air sequentially passes through the first air supply outlet 2, the second air supply outlet 3 and the third air supply outlet 4 in the air supply box 1, a certain amount of cold air is sequentially sent into the first cabinet 34, the second cabinet 35 and the third cabinet 36 according to the opening degree of each air supply outlet 2-4, and the low-temperature air forms high-temperature air again after absorbing heat of equipment in each cabinet 34-36. Meanwhile, the outdoor air in the outdoor area 37 is discharged to the outside after absorbing heat through the condenser 29 by the outdoor fan 31.
Second, external circulation forced cooling mode (see fig. 3)
The unit of the embodiment comprises the following starting conditions of an external circulation forced cooling mode: when the outdoor fresh air temperature monitored by the second temperature sensor 20 is higher than the preset air supply temperature of the unit and lower than the indoor return air temperature monitored by the first temperature sensor 19, the unit starts an external circulation forced cooling mode at the moment.
In the unit of this embodiment, in the external circulation forced cooling mode, the component states are: the air exhaust air door 21 and the fresh air door 15 are opened, and the return air door 16 is closed. The other component states are the same as those of the internal circulation forced cooling mode.
In the unit of the present embodiment, the refrigerant flow path state is the same as that in the internal circulation forced cooling mode in the external circulation forced cooling mode.
In the unit of this embodiment, in the external circulation forced cooling mode, the air flow path state is: the high-temperature air in the first cabinet 34, the second cabinet 35, and the third cabinet 36 sequentially flows through the third outlet 10, the second outlet 9, and the first outlet 8 into the return air zone 33, and then flows through the exhaust damper 21 into the outdoor zone 37. The indoor return air is discharged to the outside of the room together with the outdoor air in the outdoor area 37 after absorbing heat through the condenser 29 by the outdoor fan 31. Outdoor fresh air enters the air inlet area 32 through the fresh air damper 15, is cooled through the evaporator 14 to form low-temperature air, and then is sent into the air supply box 1 through the air feeder 11, the low-temperature air sequentially passes through the first air supply outlet 2, the second air supply outlet 3 and the third air supply outlet 4 in the air supply box 1, a certain amount of cold air is sequentially and vertically sent into the first cabinet 34, the second cabinet 35 and the third cabinet 36 according to the opening degree of each air supply outlet 2-4, and the low-temperature air forms high-temperature air again after being radiated by the absorption equipment in each cabinet 34-36.
The unit of the embodiment has the advantages that in the external circulation forced cooling mode: in the mode, the unit absorbs heat to outdoor fresh air through the evaporator 14 and reduces the temperature of the outdoor fresh air to the preset air supply temperature, and the outdoor fresh air with lower indoor return air temperature is utilized, so that the energy consumption of the refrigerating system is saved. Meanwhile, the starting conditions of the mode are met most of the year round, and compared with the traditional method for carrying out heat absorption and cooling on return air with high enthalpy, the unit can fully utilize fresh air cooling capacity to reduce the running time of a refrigerating system, and the year round energy-saving effect is obvious.
Three, external circulation natural cooling mode (see fig. 4)
The starting conditions of the external circulation natural cooling mode contained in the unit of the embodiment are as follows: when the outdoor fresh air temperature monitored by the second temperature sensor 20 is less than or equal to the preset air supply temperature of the unit, the unit starts an external circulation natural cooling mode at the moment.
In the unit of this embodiment, under the natural cooling mode of extrinsic cycle, the part state is: the air exhaust air door 21, the fresh air door 15 and the return air door 16 are all opened, and the opening degree of the fresh air door 15 and the opening degree of the return air door 16 are adjusted according to the temperature of mixed air in the air inlet area 32. When the temperature of mixed air in the air inlet area 32 is lower than the preset air supply temperature value, the air valve 17 is adjusted to reduce the opening of the fresh air door 15, and the air valve 18 is adjusted to increase the opening of the return air door 16; when the temperature of mixed air in the air inlet area 32 is higher than a preset air supply temperature value, the air valve 17 is adjusted to increase the opening of the fresh air door 15, and the air valve 18 is adjusted to decrease the opening of the return air door 16; the air valves 5-7 on the first air supply outlet 2, the second air supply outlet 3 and the third air supply outlet 4 respectively adjust the opening degree of each air supply outlet 5-7 according to the heat load condition in the first cabinet 34, the second cabinet 35 and the third cabinet 36. The compressor 28 is off and the refrigeration cycle is not operating. The blower 11 is turned on and the outdoor fan 31 is turned off.
In the unit of this embodiment, in the external circulation natural cooling mode, the air flow path state is: the high-temperature air in the first cabinet 34, the second cabinet 35 and the third cabinet 36 sequentially flows into the return air area 33 through the third air outlet 10, the second air outlet 9 and the first air outlet 8, and then the indoor return air is divided into two parts: one part enters the outdoor area 37 through the exhaust air door 21 and is finally discharged into the outdoor environment; the other part of the air enters an air inlet area 32 through an air return air door 16, meanwhile, outdoor fresh air enters the air inlet area 32 through a fresh air door 15, indoor return air and the outdoor fresh air are mixed and then cooled through an evaporator 14 to form low-temperature air, then the low-temperature air is sent into an air supply box 1 through an air feeder 11, the low-temperature air sequentially passes through a first air supply opening 2, a second air supply opening 3 and a third air supply opening 4 in the air supply box 1, a certain amount of cold air is sequentially sent into a first cabinet 34, a second cabinet 35 and a third cabinet 36 according to the opening degree of each air supply opening 2-4, and the low-temperature air forms high-temperature air again after being radiated by absorption equipment in each cabinet 34-36.
This embodiment unit under extrinsic cycle natural cooling mode, beneficial effect does: in the mode, the unit can adjust the opening of the air door 15-16 according to the air mixing temperature in the air inlet area 32, and mixes the outdoor low-temperature fresh air and the indoor high-temperature return air in different proportions, so that the air mixing in the air inlet area 32 is always maintained at a preset air supply temperature value, and the air supply temperature in the cabinets 34-36 is basically kept unchanged, compared with the traditional method in which the outdoor fresh air is directly used for cooling the cabinets 34-36, the method is more beneficial to stable operation of equipment in the cabinets 34-36.
It should be understood that other arrangements, which are within the spirit of the invention, are also within the scope of the invention.
The terms "first," "second," and the like are used herein to define components, as those skilled in the art will recognize: the use of the words "first", "second", etc. are used merely to distinguish one element from another in order to facilitate description. Unless otherwise stated, the above words have no special meaning.
The embodiments described above are intended to facilitate a person of ordinary skill in the art in understanding and using the invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. An energy-saving base station air conditioning system with multiple operation modes is characterized in that the base station air conditioning system can be structurally divided into an air inlet area, an air return area and an outdoor area and comprises an air flow path and a refrigerant loop;
the air flow path comprises a blower, an air supply box, a plurality of air supply outlets, a plurality of air outlets, an air exhaust air door, a return air door and a fresh air door;
the air feeder is a centrifugal fan and is arranged in an air inlet area at the upper part of the unit;
the base station air conditioning system comprises an air supply box, a base station air conditioning system and a control system, wherein the air supply box is a rectangular air supply channel and is horizontally attached to the upper parts of the back surfaces of a plurality of side-by-side cabinets;
the mounting height of the air supply box is consistent with that of the air supply machine, and the air outlet position of the air supply machine and the air inlet of the air supply box are on the same horizontal line;
and the air supply box is respectively provided with a first air supply outlet, a second air supply outlet and a third air supply outlet at the joint where the air supply box is attached to the first cabinet, the second cabinet and the third cabinet, and cold air in the air supply box is sequentially and vertically sent into the cabinets through the air supply outlets.
2. The energy-saving base station air conditioning system with multiple operation modes as claimed in claim 1, wherein the first air supply outlet, the second air supply outlet and the third air supply outlet can adjust the air supply quantity in each cabinet through air valves; the bottom parts of the first cabinet, the second cabinet and the third cabinet are respectively provided with a first air outlet, a second air outlet and a third air outlet, and the cabinets are communicated with one another through the air outlets.
3. The energy-saving base station air conditioning system with multiple operation modes as claimed in claim 1, wherein the exhaust air door is arranged at the connection between the return air area and the outdoor area, and whether the return air area is communicated with the outdoor area is realized by opening and closing the exhaust air door; the return air door is arranged at the joint between the air inlet area and the return air area, and the return air quantity entering the air inlet area is controlled by adjusting the opening of the air valve on the return air door.
4. The energy-saving base station air conditioning system with multiple operating modes as claimed in claim 1, wherein the fresh air damper is arranged on the side of the air intake zone above the unit, and the opening of the air valve on the fresh air damper is adjusted to control the fresh air quantity entering the air intake zone; the return air door and the fresh air door are air doors with adjustable opening degrees, and the exhaust air door is a switch type air door.
5. The energy-saving base station air conditioning system with multiple operating modes as claimed in claim 1, wherein a first temperature sensor and a second temperature sensor are respectively arranged at the return air door and the fresh air door, so as to monitor the temperature of indoor return air and outdoor fresh air; the fresh air door inlet is provided with a filtering device for filtering outdoor fresh air.
6. The energy efficient base station air conditioning system with multiple operating modes of claim 1 wherein the refrigerant loop comprises a compressor, a condenser, a throttling device, an evaporator connected in series; the compressor, the condenser and the throttling device are arranged in the outdoor area, and the evaporator is arranged in the air inlet area; an outdoor fan is arranged between the condenser and the unit shell, and the outdoor fan is an axial flow fan; the evaporator is obliquely arranged below the air feeder in the air inlet area at a certain angle, and the upper end of the evaporator is fixed with a horizontal metal plate; a control cabinet is arranged on the inner surface of the unit shell above the evaporator; a first temperature pressure sensor and a second temperature pressure sensor are respectively arranged on the air suction and exhaust pipeline of the compressor and are used for monitoring the air suction state and the air exhaust state of the compressor; and a third temperature sensor is arranged near the blower of the air inlet area and used for monitoring the air supply temperature in the air inlet area.
7. The energy efficient base station air conditioning system with multiple operating modes of claim 6, wherein the throttling device is one of a capillary tube, a throttling nipple, or an electronic expansion valve.
8. The energy-saving base station air conditioning system with multiple operating modes as claimed in claim 1, wherein the first air supply outlet, the second air supply outlet, the third air supply outlet, the return air door and the fresh air door are all air doors with adjustable opening degrees, and the exhaust air door is a switch type air door.
9. The method for applying the energy-saving base station air-conditioning system with multiple operation modes as claimed in any one of claims 1 to 8, wherein the energy-saving base station air-conditioning system can realize three operation modes by opening and closing the air door and starting and stopping the compressor:
(1) internal circulation forced cooling mode:
the state of the component: the air exhaust air door and the fresh air door are closed, the return air door is opened, the air valves on the first air supply outlet, the second air supply outlet and the third air supply outlet respectively adjust the opening degree of each air supply outlet according to the thermal load conditions in the first cabinet, the second cabinet and the third cabinet, the compressor is started, the refrigeration cycle loop is in a working state, the throttling device controls the superheat degree of the system, and the air feeder and the outdoor fan are both started;
refrigerant flow path state: the refrigerant in the evaporator is evaporated and absorbs heat to become refrigerant gas, the refrigerant gas is sucked by a suction inlet of the compressor and compressed into high-temperature and high-pressure refrigerant gas, the refrigerant gas enters the condenser for condensation and heat release, and then the refrigerant gas is throttled by the throttling device to become a gas-liquid two-phase state and finally returns to the evaporator;
air flow path state: high-temperature air in the first cabinet, the second cabinet and the third cabinet sequentially enters the air return area through the third air outlet, the second air outlet and the first air outlet, then enters the air inlet area through the air return air door, is cooled through the evaporator to form low-temperature air, then is sent into the air supply box through the air feeder, the low-temperature air sequentially passes through the first air supply opening, the second air supply opening and the third air supply opening in the air supply box, a certain amount of cold air is sequentially and vertically sent into the first cabinet, the second cabinet and the third cabinet according to the opening degree of each air supply opening, and the low-temperature air forms high-temperature air again after heat dissipation of the absorption equipment in each cabinet; meanwhile, under the action of the outdoor fan, outdoor air in the outdoor area is discharged to the outside after absorbing heat through the condenser;
(2) external circulation forced cooling mode:
the component state: the air exhaust air door is opened, the fresh air door is opened, the return air door is closed, and the states of other components are the same as the internal circulation forced cooling mode;
the refrigerant flow path state is the same as the internal circulation forced cooling mode;
air flow path state: the high-temperature air in the first cabinet, the second cabinet and the third cabinet sequentially flows into the air return zone through the third air outlet, the second air outlet and the first air outlet and then enters the outdoor zone through the air exhaust door; under the action of the outdoor fan, indoor return air and outdoor air in the outdoor area are discharged to the outside after absorbing heat through the condenser; outdoor fresh air enters an air inlet area through a fresh air door, is cooled through an evaporator to form low-temperature air, and then is sent into an air supply box through an air feeder, the low-temperature air sequentially passes through a first air supply outlet, a second air supply outlet and a third air supply outlet in the air supply box, a certain amount of cold air is sequentially and vertically sent into a first cabinet, a second cabinet and a third cabinet according to the opening degree of each air supply outlet, and the low-temperature air forms high-temperature air again after being radiated by absorption equipment in each cabinet;
(3) external circulation natural cooling mode:
the state of the component: the air exhaust air door, the fresh air door and the return air door are all opened, and the opening degrees of the fresh air door and the return air door are adjusted according to the mixed air temperature in the air inlet area; the air valves on the first air supply outlet, the second air supply outlet and the third air supply outlet respectively adjust the opening of each air supply outlet according to the thermal load conditions in the first cabinet, the second cabinet and the third cabinet; the compressor is closed, and the refrigeration cycle loop does not work; the blower is turned on, and the outdoor fan is turned off;
air flow path state: high-temperature air in first rack, second rack and the third rack is in proper order via third air outlet, second air outlet and first air outlet inward-remittance district, and later indoor return air divide into two parts: one part enters the outdoor area through the air exhaust damper and is finally exhausted into the outdoor environment; the other part of the air enters an air inlet area through a return air door, meanwhile, outdoor fresh air enters the air inlet area through a fresh air door, indoor return air and outdoor fresh air are mixed and then cooled through an evaporator to form low-temperature air, then the low-temperature air is sent into an air supply box through a blower, the low-temperature air sequentially passes through a first air supply opening, a second air supply opening and a third air supply opening in the air supply box, a certain amount of cold air is vertically sent into the first cabinet, the second cabinet and the third cabinet according to the opening degree of each air supply opening, and the low-temperature air forms high-temperature air again after being radiated by absorption equipment in each cabinet.
10. The method for applying an energy-saving base station air conditioning system with multiple operation modes as claimed in claim 9, wherein the switching mode between the modes in different scenes is as follows:
when the outdoor fresh air temperature monitored by the second temperature sensor is greater than or equal to the indoor return air temperature monitored by the first temperature sensor, the unit starts an internal circulation forced cooling mode at the moment;
when the outdoor fresh air temperature monitored by the second temperature sensor is higher than the preset air supply temperature of the unit and lower than the indoor return air temperature monitored by the first temperature sensor, the unit starts an external circulation forced cooling mode;
when the outdoor fresh air temperature monitored by the second temperature sensor is less than or equal to the preset air supply temperature of the unit, the unit starts an external circulation natural cooling mode at the moment.
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| CN202210515491.8A CN114704923A (en) | 2022-05-12 | 2022-05-12 | Energy-saving base station air conditioning system with multiple operation modes |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115190754A (en) * | 2022-08-15 | 2022-10-14 | 哈尔滨工业大学 | Air door control method for natural cooling of data center |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101413704A (en) * | 2008-11-21 | 2009-04-22 | 浙江盾安机电科技有限公司 | Base station energy-saving air conditioner |
| CN103940061A (en) * | 2014-05-07 | 2014-07-23 | 深圳海悟科技有限公司 | Energy-saving air conditioning system |
| CN104896638A (en) * | 2015-06-09 | 2015-09-09 | 长沙麦融高科股份有限公司 | Self-heat-extraction cabinet air-conditioning system and control method thereof |
| CN204739716U (en) * | 2015-06-09 | 2015-11-04 | 长沙麦融高科股份有限公司 | From heat extraction rack air conditioning system |
-
2022
- 2022-05-12 CN CN202210515491.8A patent/CN114704923A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101413704A (en) * | 2008-11-21 | 2009-04-22 | 浙江盾安机电科技有限公司 | Base station energy-saving air conditioner |
| CN103940061A (en) * | 2014-05-07 | 2014-07-23 | 深圳海悟科技有限公司 | Energy-saving air conditioning system |
| CN104896638A (en) * | 2015-06-09 | 2015-09-09 | 长沙麦融高科股份有限公司 | Self-heat-extraction cabinet air-conditioning system and control method thereof |
| CN204739716U (en) * | 2015-06-09 | 2015-11-04 | 长沙麦融高科股份有限公司 | From heat extraction rack air conditioning system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115190754A (en) * | 2022-08-15 | 2022-10-14 | 哈尔滨工业大学 | Air door control method for natural cooling of data center |
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