CN108105916B - Corridor bridge air conditioning unit for airport and control method thereof - Google Patents
Corridor bridge air conditioning unit for airport and control method thereof Download PDFInfo
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- CN108105916B CN108105916B CN201711432861.7A CN201711432861A CN108105916B CN 108105916 B CN108105916 B CN 108105916B CN 201711432861 A CN201711432861 A CN 201711432861A CN 108105916 B CN108105916 B CN 108105916B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
- 239000007921 spray Substances 0.000 claims abstract description 74
- 238000005057 refrigeration Methods 0.000 claims abstract description 32
- 238000009833 condensation Methods 0.000 claims abstract description 20
- 230000005494 condensation Effects 0.000 claims abstract description 20
- 230000017525 heat dissipation Effects 0.000 claims abstract description 15
- 238000012856 packing Methods 0.000 claims abstract description 11
- 239000000945 filler Substances 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 21
- 238000007710 freezing Methods 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 11
- 238000009423 ventilation Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000007791 dehumidification Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 abstract description 5
- 238000007906 compression Methods 0.000 abstract description 5
- 238000009434 installation Methods 0.000 abstract description 5
- 238000001704 evaporation Methods 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000013012 foaming technology Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0035—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using evaporation
-
- 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
- F24F13/22—Means for preventing condensation or evacuating condensate
-
- 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
- F24F13/30—Arrangement or mounting of heat-exchangers
-
- 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
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F3/1405—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification in which the humidity of the air is exclusively affected by contact with the evaporator of a closed-circuit cooling system or heat pump circuit
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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
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F2003/144—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by dehumidification only
- F24F2003/1446—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by dehumidification only by condensing
-
- 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
- F24F13/22—Means for preventing condensation or evacuating condensate
- F24F13/222—Means for preventing condensation or evacuating condensate for evacuating condensate
- F24F2013/225—Means for preventing condensation or evacuating condensate for evacuating condensate by evaporating the condensate in the cooling medium, e.g. in air flow from the condenser
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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)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Central Air Conditioning (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a corridor bridge air conditioning unit for an airport and a control method thereof, wherein the unit comprises an air conditioning air supply system, a control system, a frame structure air conditioning box, a multi-section multi-stage refrigeration system and an evaporative heat dissipation system arranged in the frame structure air conditioning box; the evaporative heat dissipation system comprises a spray chamber, a water receiving device and a filler layer; the packing layer is arranged in the spray chamber; the condenser group of the multistage refrigeration system is arranged in the spray chamber and above the packing layer; the water receiving device is arranged at the inner side of a condenser group of the multi-stage refrigerating system; the spray chamber is provided with an air inlet at the outer side of a condenser group of the multi-stage refrigerating system, and an air outlet at the inner side of the water receiving device. The evaporative heat dissipation system is arranged to cool the water side and the air side of the condenser group of the multi-stage refrigeration system, so that the condensation pressure and the condensation temperature of the refrigeration system are reduced, the comprehensive compression ratio is reduced, the energy efficiency ratio is improved, and the air-conditioning system has the advantages of compact equipment, flexible and various installation, high-efficiency and energy-saving operation and accurate temperature control.
Description
Technical Field
The invention belongs to the technical field of aircraft ground air conditioners, and particularly relates to a gallery bridge air conditioning unit for an airport and a control method thereof.
Background
At present, the existing aircraft ground air conditioning unit is characterized in that after the fresh air is directly evaporated and cooled by a refrigerating system of the unit or heated by an electric heater, the fresh air is sent into an aircraft cabin and a cab through an aircraft air conditioning air supply opening by an adiabatic conveying hose and a quick connector, and the processed cooling air with certain flow, temperature and pressure is provided for an aircraft parked at an airport.
The traditional gallery bridge air conditioning unit for the airport generally adopts an air cooling mode to exchange heat with a condenser of a refrigerating system, however, the air cooling has high condensation temperature and low evaporation temperature required by use occasions, so that the operating pressure ratio of the refrigerating system is large, the operating energy efficiency is poor, the energy consumption is increased, and the operating cost is high; meanwhile, the fresh air is changed into low-temperature air supply after cooling treatment, and a large amount of condensed water generated in the process is directly discharged, so that the fresh air cannot be effectively recycled, and the resource waste is excessive.
It can be seen that there is a need for improvements and improvements in the art.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide a corridor bridge air conditioning unit for an airport and a control method thereof, which can cool a condenser unit of a multi-stage refrigerating system on a water side and an air side, effectively reduce the condensing pressure and the condensing temperature of the refrigerating system, reduce the comprehensive compression ratio, improve the energy efficiency ratio, and have the advantages of compact equipment, flexible and various installation, high-efficiency and energy-saving operation and accurate temperature control.
In order to achieve the technical purposes mentioned above, the present invention adopts the following technical scheme:
the utility model provides an airport is with corridor bridge air conditioning unit, includes air conditioner air supply system, control system, frame construction air conditioning case, multistage refrigerating system, the axial fan is installed to frame construction air conditioning case, air conditioner air supply system includes wind channel and the high pressure blower unit of setting in the wind channel, multistage refrigerating system's evaporator set sets up in the wind channel inside, this air conditioning unit still includes the evaporation type cooling system who sets up in frame construction air conditioning case inside; the evaporative heat dissipation system comprises a spray chamber, a water receiving device and a filler layer; the packing layer is arranged in the spray chamber; the condenser group of the multistage multi-stage refrigeration system is arranged in the spray chamber and above the packing layer; the water receiving device is arranged on the inner side of a condenser group of the multi-stage refrigerating system; the spray chamber is provided with an air inlet at the outer side of a condenser group of the multi-stage refrigerating system, and an air outlet at the inner side of the water receiving device.
In the gallery bridge air conditioning unit for the airport, the air duct comprises a first air duct and a second air duct, the inlet and the outlet of the high-pressure blower unit are correspondingly connected with the first air duct and the second air duct, the multistage refrigeration system comprises a front multistage refrigeration system and a rear multistage refrigeration system, the evaporator set of the front multistage refrigeration system is arranged in the first air duct, and the evaporator set of the rear multistage refrigeration system is arranged in the second air duct.
In the gallery bridge air conditioning unit for the airport, the air conditioning unit further comprises a condensation water recovery device; the water inlet of the condensation water recovery device is positioned between the evaporator group of the front-stage multi-stage refrigerating system and the inlet of the high-pressure blower unit and is communicated with the bottom of the first air duct, and the water outlet of the condensation water recovery device is connected with the spray chamber.
In the gallery bridge air conditioning unit for the airport, the air conditioning unit further comprises an antifreezing device; the anti-freezing device is arranged in the air conditioning box with the frame structure and in front of the inlet of the air duct and comprises a heater, a front temperature sensor and a rear temperature sensor; the front temperature sensor and the rear temperature sensor are correspondingly arranged on the front side and the rear side of the heater.
In the corridor bridge air conditioning unit for the airport, the control system comprises a temperature detection system and a central control system; the temperature detection system comprises a first sensor for detecting the external temperature, a second sensor for detecting the fresh air temperature cooled by the front-stage multi-stage refrigerating system, a third sensor for detecting the fresh air temperature at the outlet of the high-pressure blower unit, a fourth sensor for detecting the air supply temperature, a fifth sensor for detecting the air outlet temperature of the spray chamber and a sixth sensor for detecting the temperature in the air conditioning box of the frame structure.
The control method of the corridor bridge air conditioning unit for the airport specifically comprises the following steps:
step A: starting a central control system, setting a set value Tk of air supply temperature and non-negative parameters Ta, tb and Tc, wherein Ta is smaller than Tb and Tc;
and (B) step (B): the temperature detection system works, the first sensor detects the external temperature as T0, the front temperature sensor detects the inlet temperature of the antifreezing device as T1, the rear temperature sensor detects the outlet temperature of the antifreezing device as T2, the second sensor detects the outlet fresh air temperature of the front-stage multi-stage refrigerating system as T3, the outlet fresh air temperature set value of the front-stage multi-stage refrigerating system as T3, the third sensor detects the fresh air temperature of the outlet of the high-pressure blower unit as T4, the fourth sensor detects the air supply temperature as T5, the fifth sensor detects the outlet temperature of the spray chamber as T6, the outlet temperature set value of the spray chamber as T6, the sixth sensor detects the temperature in the air conditioning box of the frame structure as T7, the temperature set value in the air conditioning box of the frame structure as T7, and the detected temperature value is transmitted to the central control system;
step C: the central control system compares and analyzes the magnitude relation between t1 and t0-Ta, t0-Tb and t0-Tc, automatically selects an operation mode, namely a dehumidifying and cooling operation mode or a ventilation operation mode, and controls the operation or stop working state of the multi-stage refrigerating system, the anti-freezing device, the axial flow fan, the spray chamber and the high-pressure blower unit.
In the control method of the corridor bridge air conditioning unit for the airport, when the dehumidification cooling operation mode is selected in the step C, if t1 is more than or equal to t0-Ta, the control method is operated according to the step D1:
step D1: the compressor units of the multistage multi-stage refrigerating system are all started, the antifreezing device keeps a stop state, and the high-pressure blower unit, the axial flow fan and the spray chamber are started to operate;
if t0-Tb is less than t1 and less than t0-Ta, the method is operated according to the step D2:
step D2: the front-stage multi-stage refrigerating system is started, the rear-stage multi-stage refrigerating system is closed, the antifreezing device keeps a stop state, and the high-pressure blower unit, the axial flow fan and the spray chamber are started to operate;
if t0-Tc is less than t1 and less than or equal to t0-Tb, the method operates according to the step D3:
step D3: the rear-stage multi-stage refrigerating system is started, the front-stage multi-stage refrigerating system is closed, the antifreezing device keeps a stop state, and the high-pressure blower unit, the axial flow fan and the spray chamber are started to operate.
In the control method of the corridor bridge air conditioning unit for the airport, when the ventilation operation mode is selected in the step C, t1 is less than or equal to t0-Tc, the control method is operated according to the step D4:
step D4: the multi-stage and multi-stage refrigerating system, the axial flow fan and the spray chamber do not operate, and the high-pressure fan unit and the antifreezing device start to operate.
In the control method of the corridor bridge air conditioning unit for the airport, when the air conditioning unit works in a dehumidifying and refrigerating operation mode, the central control system ensures that the air supply temperature reaches the control precision range through the following steps:
step E1: if T1 is more than T0-Tb, the central control system judges the size relation between T3 and T3-0.5 and the size relation between T3 and T3 plus 0.5; if T3 is greater than T3+0.5, executing the step E11; if T3-0.5 is not less than T3 and not more than T3+0.5, executing the step E12; if T3 is less than T3-0.5, executing the step E13;
step E11: the front-stage multi-stage refrigerating system is loaded and operated, so that the temperature T3 of the outlet fresh air of the front-stage multi-stage refrigerating system is ensured to be within the temperature range from T3-0.5 to T3+0.5;
step E12: the front-stage multi-stage refrigerating system keeps working condition operation;
step E13: unloading operation of the front-stage multi-stage refrigeration system, and ensuring that the outlet fresh air temperature T3 of the front-stage multi-stage refrigeration system is within a temperature range from T3-0.5 to T3+0.5;
step F1: the central control system judges the size relation between T6 and T6; if T6 is more than T6, increasing the flow of the circulating water pump of the spray chamber; if T6 is less than T6, reducing the flow of the circulating water pump of the spray chamber;
step G1: the central control system judges the size relation between T7 and T7; if T7 is more than T7, increasing the air discharge quantity of the axial flow fan; if T7 is smaller than T7, reducing the exhaust amount of the axial flow fan;
step H1: if t1 is more than or equal to t0-Ta or t1 is less than or equal to t0-Tb, the central control system judges the magnitude relation between t5 and Tk-1 and Tk+1; if t5 is greater than Tk+1, executing step H11; if Tk-1 is not less than t5 and not more than Tk+1, executing step H12; if t5 is less than Tk-1, executing step H13;
step H11: the rear-stage multi-stage refrigerating system is loaded and operated, so that the air supply temperature t5 is ensured to be within the temperature range of Tk-1 to Tk+1;
step H12: the rear-stage multi-stage refrigerating system keeps working condition operation;
step H13: the rear-stage multi-stage refrigerating system is unloaded and operated, and the air supply temperature t5 is ensured to be within the temperature range of Tk-1 to Tk+1.
In the control method of the corridor bridge air conditioning unit for the airport, when the air conditioning unit works in a ventilation operation mode, the central control system ensures that the air supply temperature reaches the control precision range through the following steps:
step E2: the central control system judges the magnitude relation between the air supply temperature t5 and Tk-1 and Tk+1; if t5 is greater than Tk+1, executing the step E21; if Tk-1 is not less than t5 and not more than Tk+1, executing a step E22; if t5 is less than Tk-1, executing the step E23;
step E21: reducing the heating power of the anti-freezing device, and ensuring that the air supply temperature t5 is within the temperature range of Tk-1 to Tk+1;
step E22: the anti-freezing device keeps working condition operation;
step E23: the heating power of the anti-freezing device is increased, and the air supply temperature t5 is ensured to be within the temperature range of Tk-1 to Tk+1.
The beneficial effects are that:
the invention provides a corridor bridge air conditioning unit for an airport and a control method thereof, wherein an evaporative heat dissipation system is arranged to cool a condenser unit of a multi-stage refrigerating system on a water side and an air side, so that the cooling effect of the condenser unit is enhanced, the condensing pressure and the condensing temperature of a high-pressure side of the refrigerating system are effectively reduced, and the fresh air of an air channel is dehumidified and cooled by adopting a multi-stage direct evaporation mode, so that the comprehensive compression ratio of the unit can be effectively reduced, and the comprehensive energy efficiency ratio of the unit is improved.
The water sprayed by the spray chamber of the evaporative heat dissipation system absorbs heat and gasifies, so that heat of the condenser group is taken away, cold air entering from the outside passes through the spray chamber, firstly absorbs the heat of the condenser group and transfers the heat to water, so that the temperature is effectively reduced, then the water enters the air conditioning box with the frame structure and exchanges heat with high-temperature air in the air conditioning box, the interior is cooled, and the normal operation of the machine equipment in the air conditioning box is ensured. Compared with the traditional aircraft ground air conditioning unit, the invention combines the air side and water side cooling modes to realize the refrigerant condensation of the condenser unit, adopts the spraying mode to cool the outside cold air, and obtains lower condensation temperature of the condenser unit and lower internal temperature of the air conditioning box with the frame structure. In addition, setting up condensate recovery unit, can produce a large amount of condensate after the fresh air is dehumidified and cooled down and handle, carry out the recycle of condensate, carry it to spray room, regard as the supplementary water source, realize resource high-efficient utilization and energy-conservation.
Drawings
Fig. 1 is a left side view of the interior of the corridor bridge air conditioning unit for an airport provided by the invention.
Fig. 2 is a front view of the interior of the gallery bridge air conditioning unit for an airport provided by the invention.
Fig. 3 is an internal plan view of the corridor bridge air conditioning unit for an airport provided by the invention.
Fig. 4 is a flow chart of steps of a control method of a corridor bridge air conditioning unit for an airport.
Detailed Description
The invention provides a corridor bridge air conditioning unit for an airport and a control method thereof, which are used for making the purposes, the technical scheme and the effects of the invention clearer and more definite, and the invention is further described in detail below by referring to the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "left", "right", "inner", "outer", "front", "rear", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in description of the present invention and simplification of the description. Furthermore, the terms "first," second, "" third, "" fourth, "" fifth, "and sixth" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
Referring to fig. 1, 2 and 3, the present invention provides a corridor bridge air conditioning unit for an airport, which comprises an air conditioning air supply system, a control system, a frame structure air conditioning box 1 and a multi-stage refrigeration system, wherein the frame structure air conditioning box 1 is provided with an axial flow fan 2, the air conditioning air supply system comprises an air duct and a high pressure blower unit 10 arranged in the air duct, an evaporator unit of the multi-stage refrigeration system is arranged in the air duct, and the air conditioning unit further comprises an evaporation type heat dissipation system arranged in the frame structure air conditioning box 1; the evaporative heat dissipation system comprises a spray chamber 3, a water receiving device 4 and a filler layer 5; the packing layer 5 is arranged in the spray chamber 3; the condenser set 61 of the multistage multi-stage refrigerating system is arranged in the spray chamber 3 and above the packing layer 5; the water receiving device 4 is arranged inside a condenser group 61 of the multi-stage refrigeration system; the spray chamber 3 is provided with an air inlet at the outer side of a condenser group 61 of the multi-stage refrigerating system, an air outlet at the inner side of the water receiving device 4, external cold air for heat dissipation enters the spray chamber 3 according to the direction C to complete heat exchange, and enters the air conditioning box 1 with a frame structure after passing through the spray chamber 3 to take away heat generated by the operation of internal equipment and finally flows to the outside through the axial flow fan 2. The evaporative heat dissipation systems are arranged on two sides of the air duct.
Wherein A is the direction of the external full fresh air entering the air conditioning unit, B is the direction of the full fresh air coming out of the air conditioning unit, C is the direction of the external cold air for heat dissipation entering the spray chamber, and D is the direction of the cold air output from the axial flow fan. The top of the spray chamber 3 is provided with a water distribution system (not shown in the figure), and the water distribution system uniformly distributes water in the spray chamber 3 and sprays the water from top to bottom. External cold air enters from an air inlet of the spray chamber 3, exchanges heat with a condenser group 61 and spray water of a multi-stage refrigerating system in the spray chamber 3, then flows into the air conditioning box 1 with a frame structure through the water receiving device 4, takes away heat generated by the operation of internal machine equipment, and flows out through the axial flow fan 2. The condenser set 61 of the multistage multi-stage refrigeration system exchanges heat with water sprayed down, the water film on the outer surface of the condenser set 61 absorbs the heat of the refrigerant flowing in the condenser set 61, and the refrigerant evaporates to form water vapor, so that the water side cooling work is completed; on the other hand, exchanges heat with external cold air to finish air side cooling. The water side cooling and the air side cooling are combined to efficiently cool the condenser set 61, and the condensing pressure and condensing temperature of the high-pressure side of the condenser set are effectively reduced, so that the compression ratio of the compressor set can be effectively reduced without being limited by the temperature of external cold air in the condensing process. In addition, the outside cold air exchanges heat with the spray water, the temperature is reduced, the temperature inside the air conditioning box 1 with the frame structure can be reduced more effectively, and the proper working temperature is provided for the internal machine equipment. The external cold air can pass through the water receiving device 4 with the steam-water separation function before being discharged out of the spray chamber 3, so that water drops carried by the cold air are separated from air, and the loss of the escaping water quantity of the spray chamber 3 is reduced. The packing layer 5 is arranged in the spray chamber 3, and after heat exchange is carried out between spray water and the condenser group 61 of the multi-stage refrigeration system, the spray water flows downwards to the packing layer 5, and heat exchange is carried out when the porous structure of the packing layer 5 flows, so that water cooling is realized.
A plurality of axial flow fans may be provided as required, and in the present invention, a first axial flow fan 21, a second axial flow fan 22, and a third axial flow fan 23 are preferably provided. The multistage multi-stage refrigerating system comprises a condenser group, a compressor group, an evaporator group and a throttling device, and can cool and cool fresh air.
Specifically, the air duct includes a first air duct 91 and a second air duct 92, an inlet of the high-pressure blower unit 10 is connected to the first air duct 91, an outlet of the high-pressure blower unit 10 is connected to the second air duct 92, the multi-stage refrigeration system includes a front-stage multi-stage refrigeration system and a rear-stage multi-stage refrigeration system, an evaporator set 64 of the front-stage multi-stage refrigeration system is disposed in the first air duct 91, and an evaporator set 65 of the rear-stage multi-stage refrigeration system is disposed in the second air duct 92. The fresh air is dehumidified and cooled in the first air duct 91 by the front stage multi-stage refrigerating system, the temperature and humidity are reduced, and then the fresh air is conveyed to the second air duct 92 by the operation of the motor 101 of the high-pressure blower unit 10, and then is further cooled by the rear stage multi-stage refrigerating system, so as to meet the air supply requirement.
Further, the air conditioning unit also comprises a condensation water recovery device 8; the water inlet of the condensation water recovery device 8 is positioned between the evaporator set 64 of the front-stage multi-stage refrigeration system and the inlet of the high-pressure blower set 10 and is communicated with the bottom of the first air duct 91, and the water outlet of the condensation water recovery device 8 is connected with the spray chamber 3. The fresh air of damp and hot gets into first wind channel 91, can condense after the dehumidification cooling and separate out the condensate water, and condensate water device 8 that is located the bottom of first wind channel 91 collects and carries the cistern bottom spray room 3, and the circulating water pump of spray room 3 carries the water extraction of cistern to the water distribution system of spray room 3. The condensation water device 8 can effectively recycle and effectively utilize the residual condensation water in the first air duct 91, and the residual condensation water is sent to the spray chamber 3 to serve as make-up water, so that the water resource recycling is realized in the unit operation process, the water consumption is reduced, and the operation cost is reduced.
Further, the air conditioning unit also comprises an antifreezing device 7; the anti-freezing device 7 is arranged in the frame structure air conditioner box 1 and in front of the inlet of the air duct, and the anti-freezing device 7 comprises a heater, a front temperature sensor and a rear temperature sensor; the front temperature sensor is disposed at the front side of the heater, and the rear temperature sensor is disposed at the rear side of the heater. When the external temperature is too low, the multistage refrigeration system does not need to operate, and the work of the anti-freezing device 7 is needed to meet the air supply requirement. The front temperature sensor detects the temperature of fresh air coming from the external environment, if the external temperature is lower than the set value of air supply, the antifreezing device 7 is started, the heater operates to heat the fresh air, and then the temperature sensor detects the temperature of the fresh air heated by the heater and is matched with the control system to perform power adjustment on the heater so as to confirm that the heated fresh air temperature meets the air supply requirement.
Specifically, the control system includes a temperature detection system and a central control system 11; the temperature detection system comprises a first sensor for detecting the external temperature, a second sensor for detecting the fresh air temperature cooled by the front-stage multi-stage refrigerating system, a third sensor for detecting the fresh air temperature at the outlet of the high-pressure blower unit 10, a fourth sensor for detecting the air supply temperature, a fifth sensor for detecting the air outlet temperature of the spray chamber 3 and a sixth sensor for detecting the temperature in the air conditioning box 1 with the frame structure. The temperature detection system is electrically connected with the central control system 11, so that the detected temperature value is sent to the central control system, and the central control system 11 regulates and controls the machine equipment of the unit. In addition, the air conditioning unit is further provided with a humidity detection system, a smoke detection system and the like, so that the air conditioning unit can be ensured to run safely and stably, and serious accidents are avoided. The central control system 11 is installed outside the frame structure air conditioning case 1, and an air supply valve 12 is provided on the air supply duct. The air conditioning unit adopts the high-pressure polyurethane foaming technology of the integral embedded rib frame to carry out high-pressure resistance, heat insulation and heat preservation, and avoids cold bridge and leakage.
The air conditioning unit has compact equipment, flexible and various installation, can realize ground installation and gallery bridge hanging installation, can adopt heat dissipation and exhaust modes such as top heat exhaust, bottom heat exhaust, end heat exhaust and the like, and has the advantages of high efficiency, energy conservation, stability, reliability and precise control.
The invention also discloses a control method of the corridor bridge air conditioning unit for the airport, which comprises the following steps:
step A: starting a central control system, setting a set value Tk of air supply temperature and non-negative parameters Ta, tb and Tc, wherein Ta is smaller than Tb and Tc;
and (B) step (B): the temperature detection system works, the first sensor detects the external temperature as T0, the front temperature sensor detects the inlet temperature of the antifreezing device as T1, the rear temperature sensor detects the outlet temperature of the antifreezing device as T2, the second sensor detects the outlet fresh air temperature of the front-stage multi-stage refrigerating system as T3, the outlet fresh air temperature set value of the front-stage multi-stage refrigerating system as T3, the third sensor detects the fresh air temperature of the outlet of the high-pressure blower unit as T4, the fourth sensor detects the air supply temperature as T5, the fifth sensor detects the outlet temperature of the spray chamber as T6, the outlet temperature set value of the spray chamber as T6, the sixth sensor detects the temperature in the air conditioning box of the frame structure as T7, the temperature set value in the air conditioning box of the frame structure as T7, and the detected temperature value is transmitted to the central control system;
step C: the central control system compares and analyzes the magnitude relation between t1 and t0-Ta, t0-Tb and t0-Tc, automatically selects an operation mode, namely a dehumidifying and cooling operation mode or a ventilation operation mode, and controls the operation or stop working state of the multi-stage refrigerating system, the anti-freezing device, the axial flow fan, the spray chamber and the high-pressure blower unit.
Specifically, when the dehumidification cooling operation mode is selected in the step C, if t1 is more than or equal to t0-Ta, the operation is performed according to the step D1:
step D1: the compressor units of the multistage multi-stage refrigerating system are all started, the antifreezing device keeps a stop state, and the high-pressure blower unit, the axial flow fan and the spray chamber are started to operate;
if t0-Tb is less than t1 and less than t0-Ta, the method is operated according to the step D2:
step D2: the front-stage multi-stage refrigerating system is started, the rear-stage multi-stage refrigerating system is closed, the antifreezing device keeps a stop state, and the high-pressure blower unit, the axial flow fan and the spray chamber are started to operate;
if t0-Tc is less than t1 and less than or equal to t0-Tb, the method operates according to the step D3:
step D3: the rear-stage multi-stage refrigerating system is started, the front-stage multi-stage refrigerating system is closed, the antifreezing device keeps a stop state, and the high-pressure blower unit, the axial flow fan and the spray chamber are started to operate.
Specifically, when the ventilation operation mode is selected in the step C, t1 is less than or equal to t0-Tc, the operation is performed according to the step D4:
step D4: the multi-stage and multi-stage refrigerating system, the axial flow fan and the spray chamber do not operate, and the high-pressure fan unit and the antifreezing device start to operate.
Specifically, when the air conditioning unit works in a dehumidifying and refrigerating operation mode, the central control system ensures that the air supply temperature reaches the control precision range through the following steps:
step E1: if T1 is more than T0-Tb, the central control system judges the size relation between T3 and T3-0.5 and the size relation between T3 and T3 plus 0.5; if T3 is greater than T3+0.5, executing the step E11; if T3-0.5 is not less than T3 and not more than T3+0.5, executing the step E12; if T3 is less than T3-0.5, executing the step E13;
step E11: the front-stage multi-stage refrigerating system is loaded and operated, so that the temperature T3 of the outlet fresh air of the front-stage multi-stage refrigerating system is ensured to be within the temperature range from T3-0.5 to T3+0.5;
step E12: the front-stage multi-stage refrigerating system keeps working condition operation;
step E13: unloading operation of the front-stage multi-stage refrigeration system, and ensuring that the outlet fresh air temperature T3 of the front-stage multi-stage refrigeration system is within a temperature range from T3-0.5 to T3+0.5;
step F1: the central control system judges the size relation between T6 and T6; if T6 is more than T6, increasing the flow of the circulating water pump of the spray chamber; if T6 is less than T6, reducing the flow of the circulating water pump of the spray chamber;
step G1: the central control system judges the size relation between T7 and T7; if T7 is more than T7, increasing the air discharge quantity of the axial flow fan; if T7 is smaller than T7, reducing the exhaust amount of the axial flow fan;
step H1: if t1 is more than or equal to t0-Ta or t1 is less than or equal to t0-Tb, the central control system judges the magnitude relation between t5 and Tk-1 and Tk+1; if t5 is greater than Tk+1, executing step H11; if Tk-1 is not less than t5 and not more than Tk+1, executing step H12; if t5 is less than Tk-1, executing step H13;
step H11: the rear-stage multi-stage refrigerating system is loaded and operated, so that the air supply temperature t5 is ensured to be within the temperature range of Tk-1 to Tk+1;
step H12: the rear-stage multi-stage refrigerating system keeps working condition operation;
step H13: the rear-stage multi-stage refrigerating system is unloaded and operated, and the air supply temperature t5 is ensured to be within the temperature range of Tk-1 to Tk+1.
Specifically, when the air conditioning unit works in the ventilation operation mode, the central control system ensures that the air supply temperature reaches the control precision range through the following steps:
step E2: the central control system judges the magnitude relation between the air supply temperature t5 and Tk-1 and Tk+1; if t5 is greater than Tk+1, executing the step E21; if Tk-1 is not less than t5 and not more than Tk+1, executing a step E22; if t5 is less than Tk-1, executing the step E23;
step E21: reducing the heating power of the anti-freezing device, and ensuring that the air supply temperature t5 is within the temperature range of Tk-1 to Tk+1;
step E22: the anti-freezing device keeps working condition operation;
step E23: the heating power of the anti-freezing device is increased, and the air supply temperature t5 is ensured to be within the temperature range of Tk-1 to Tk+1.
In summary, the invention provides a corridor bridge air conditioning unit for an airport and a control method thereof, wherein an evaporative heat dissipation system is arranged to cool a condenser set of a multi-stage refrigeration system on a water side and an air side, so that the cooling effect of the condenser set is enhanced, the condensation pressure and the condensation temperature of a high-pressure side of the refrigeration system are effectively reduced, the fresh air of an air channel is dehumidified and cooled by adopting a multi-stage direct evaporation mode, the comprehensive compression ratio of the unit can be effectively reduced, and the comprehensive energy efficiency ratio of the unit is improved.
The water sprayed by the spray chamber of the evaporative heat dissipation system absorbs heat and gasifies, so that heat of the condenser group is taken away, cold air entering from the outside passes through the spray chamber, firstly absorbs the heat of the condenser group and transfers the heat to water, so that the temperature is effectively reduced, then the water enters the air conditioning box with the frame structure and exchanges heat with high-temperature air in the air conditioning box, the interior is cooled, and the normal operation of the machine equipment in the air conditioning box is ensured. Compared with the traditional aircraft ground air conditioning unit, the invention combines the air side and water side cooling modes to realize the refrigerant condensation of the condenser unit, adopts the spraying mode to cool the outside cold air, and obtains lower condensation temperature of the condenser unit and lower internal temperature of the air conditioning box with the frame structure. In addition, setting up condensate recovery unit, can produce a large amount of condensate after the fresh air is dehumidified and cooled down and handle, carry out the recycle of condensate, carry it to spray room, regard as the supplementary water source, realize resource high-efficient utilization and energy-conservation.
It will be understood that equivalents and modifications will occur to those skilled in the art in light of the present invention and their spirit, and all such modifications and substitutions are intended to be included within the scope of the present invention as defined in the following claims.
Claims (5)
1. The corridor bridge air conditioning unit comprises an air conditioning air supply system, a control system, a frame structure air conditioning box and a multi-stage refrigerating system, wherein the frame structure air conditioning box is provided with an axial flow fan, the air conditioning air supply system comprises an air duct and a high-pressure blower unit arranged in the air duct, and an evaporator unit of the multi-stage refrigerating system is arranged in the air duct; the evaporative heat dissipation system comprises a spray chamber, a water receiving device and a filler layer; the packing layer is arranged in the spray chamber; the condenser group of the multistage multi-stage refrigeration system is arranged in the spray chamber and above the packing layer; the water receiving device is arranged on the inner side of a condenser group of the multi-stage refrigerating system; the spray chamber is provided with an air inlet at the outer side of a condenser group of the multi-stage refrigerating system, and an air outlet at the inner side of the water receiving device; the air duct comprises a first air duct and a second air duct, the inlet and the outlet of the high-pressure blower unit are correspondingly connected with the first air duct and the second air duct, the multi-stage refrigerating system comprises a front-stage multi-stage refrigerating system and a rear-stage multi-stage refrigerating system, the evaporator group of the front-stage multi-stage refrigerating system is arranged in the first air duct, and the evaporator group of the rear-stage multi-stage refrigerating system is arranged in the second air duct; the air conditioning unit further comprises an antifreezing device; the anti-freezing device is arranged in the air conditioning box with the frame structure and in front of the inlet of the air duct and comprises a heater, a front temperature sensor and a rear temperature sensor; the front temperature sensor and the rear temperature sensor are correspondingly arranged on the front side and the rear side of the heater; the control system comprises a temperature detection system and a central control system; the temperature detection system comprises a first sensor for detecting the external temperature, a second sensor for detecting the fresh air temperature cooled by the front-stage multi-stage refrigerating system, a third sensor for detecting the fresh air temperature at the outlet of the high-pressure blower unit, a fourth sensor for detecting the air supply temperature, a fifth sensor for detecting the air outlet temperature of the spray chamber and a sixth sensor for detecting the temperature in the air conditioning box of the frame structure; the control method comprises the following steps:
step A: starting a central control system, setting a set value Tk of air supply temperature and non-negative parameters Ta, tb and Tc, wherein Ta is smaller than Tb and Tc;
and (B) step (B): the temperature detection system works, the first sensor detects the external temperature as T0, the front temperature sensor detects the inlet temperature of the antifreezing device as T1, the rear temperature sensor detects the outlet temperature of the antifreezing device as T2, the second sensor detects the outlet fresh air temperature of the front-stage multi-stage refrigerating system as T3, the outlet fresh air temperature set value of the front-stage multi-stage refrigerating system as T3, the third sensor detects the fresh air temperature of the outlet of the high-pressure blower unit as T4, the fourth sensor detects the air supply temperature as T5, the fifth sensor detects the outlet temperature of the spray chamber as T6, the outlet temperature set value of the spray chamber as T6, the sixth sensor detects the temperature in the air conditioning box of the frame structure as T7, the temperature set value in the air conditioning box of the frame structure as T7, and the detected temperature value is transmitted to the central control system;
step C: the central control system compares and analyzes the size relation between t1 and t0-Ta, t0-Tb and t0-Tc, automatically selects an operation mode, namely a dehumidification cooling operation mode or a ventilation operation mode, and controls the operation or stop working states of the multi-section multi-stage refrigeration system, the anti-freezing device, the axial flow fan, the spray chamber and the high-pressure blower unit;
when the dehumidification cooling operation mode is selected in the step C,
if t1 is greater than or equal to t0-Ta, operating according to the step D1:
step D1: the compressor units of the multistage multi-stage refrigerating system are all started, the antifreezing device keeps a stop state, and the high-pressure blower unit, the axial flow fan and the spray chamber are started to operate;
if t0-Tb is less than t1 and less than t0-Ta, the method is operated according to the step D2:
step D2: the front-stage multi-stage refrigerating system is started, the rear-stage multi-stage refrigerating system is closed, the antifreezing device keeps a stop state, and the high-pressure blower unit, the axial flow fan and the spray chamber are started to operate;
if t0-Tc is less than t1 and less than or equal to t0-Tb, the method operates according to the step D3:
step D3: the rear-stage multi-stage refrigerating system is started, the front-stage multi-stage refrigerating system is closed, the antifreezing device keeps a stop state, and the high-pressure blower unit, the axial flow fan and the spray chamber are started to operate.
2. The control method of a bridge air conditioner for an airport according to claim 1, wherein the air conditioner further comprises a condensate recovery device; the water inlet of the condensation water recovery device is positioned between the evaporator group of the front-stage multi-stage refrigerating system and the inlet of the high-pressure blower unit and is communicated with the bottom of the first air duct, and the water outlet of the condensation water recovery device is connected with the spray chamber.
3. The control method of the bridge air conditioner set for the airport according to claim 1, wherein when the ventilation operation mode is selected in the step C, t1 is less than or equal to t0-Tc, the operation is performed according to the step D4:
step D4: the multi-stage and multi-stage refrigerating system, the axial flow fan and the spray chamber do not operate, and the high-pressure fan unit and the antifreezing device start to operate.
4. The control method of the corridor bridge air conditioning unit for the airport according to claim 1, wherein when the air conditioning unit works in a dehumidifying and refrigerating operation mode, the central control system ensures that the supply air temperature reaches the control precision range by the following steps:
step E1: if T1 is more than T0-Tb, the central control system judges the size relation between T3 and T3-0.5 and the size relation between T3 and T3 plus 0.5; if T3 is greater than T3+0.5, executing the step E11; if T3-0.5 is not less than T3 and not more than T3+0.5, executing the step E12; if T3 is less than T3-0.5, executing the step E13;
step E11: the front-stage multi-stage refrigerating system is loaded and operated, so that the temperature T3 of the outlet fresh air of the front-stage multi-stage refrigerating system is ensured to be within the temperature range from T3-0.5 to T3+0.5;
step E12: the front-stage multi-stage refrigerating system keeps working condition operation;
step E13: unloading operation of the front-stage multi-stage refrigeration system, and ensuring that the outlet fresh air temperature T3 of the front-stage multi-stage refrigeration system is within a temperature range from T3-0.5 to T3+0.5;
step F1: the central control system judges the size relation between T6 and T6; if T6 is more than T6, increasing the flow of the circulating water pump of the spray chamber; if T6 is less than T6, reducing the flow of the circulating water pump of the spray chamber;
step G1: the central control system judges the size relation between T7 and T7; if T7 is more than T7, increasing the air discharge quantity of the axial flow fan; if T7 is smaller than T7, reducing the exhaust amount of the axial flow fan;
step H1: if t1 is more than or equal to t0-Ta or t1 is less than or equal to t0-Tb, the central control system judges the magnitude relation between t5 and Tk-1 and Tk+1; if t5 is greater than Tk+1, executing step H11; if Tk-1 is not less than t5 and not more than Tk+1, executing step H12; if t5 is less than Tk-1, executing step H13;
step H11: the rear-stage multi-stage refrigerating system is loaded and operated, so that the air supply temperature t5 is ensured to be within the temperature range of Tk-1 to Tk+1;
step H12: the rear-stage multi-stage refrigerating system keeps working condition operation;
step H13: the rear-stage multi-stage refrigerating system is unloaded and operated, and the air supply temperature t5 is ensured to be within the temperature range of Tk-1 to Tk+1.
5. The control method of the corridor bridge air conditioning unit for the airport according to claim 3, wherein when the air conditioning unit works in a ventilation operation mode, the central control system ensures that the supply air temperature reaches the control precision range by the following steps:
step E2: the central control system judges the magnitude relation between the air supply temperature t5 and Tk-1 and Tk+1; if t5 is greater than Tk+1, executing the step E21; if Tk-1 is not less than t5 and not more than Tk+1, executing a step E22; if t5 is less than Tk-1, executing the step E23;
step E21: reducing the heating power of the anti-freezing device, and ensuring that the air supply temperature t5 is within the temperature range of Tk-1 to Tk+1;
step E22: the anti-freezing device keeps working condition operation;
step E23: the heating power of the anti-freezing device is increased, and the air supply temperature t5 is ensured to be within the temperature range of Tk-1 to Tk+1.
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