CN104251529A - Combined type refrigeration and multi-connected air conditioning system - Google Patents

Combined type refrigeration and multi-connected air conditioning system Download PDF

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Publication number
CN104251529A
CN104251529A CN201410549491.5A CN201410549491A CN104251529A CN 104251529 A CN104251529 A CN 104251529A CN 201410549491 A CN201410549491 A CN 201410549491A CN 104251529 A CN104251529 A CN 104251529A
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China
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air
refrigerant
heat exchanger
combined type
valve
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CN201410549491.5A
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Chinese (zh)
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CN104251529B (en
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王铁军
曾晓程
刘志峰
王景晖
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中国扬子集团滁州扬子空调器有限公司
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00Air-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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/89Arrangement or mounting of control or safety devices

Abstract

The invention discloses a combined refrigeration and multi-connected air conditioning system which is characterized in that a cold source system of the multi-connected air conditioning system, which is composed of two or more than two outdoor composite refrigeration modules is arranged outdoors; each outdoor combined refrigeration module is formed by compositing a first refrigerant vapor compression refrigeration cycle loop and a second refrigerant cycle loop; one or more direct evaporative indoor air cooler modules are arranged indoors, and a refrigerant storage and transmission unit is connected between each outdoor composite refrigeration module and the corresponding indoor air cooler module to form a closed cycle system through a liquid collecting pipe, a liquid supply main pipe and a return air main pipe. According to the combined refrigeration and multi-connected air conditioning system, the number of the indoor and outdoor modules is set according to the design heating loads of air conditioning objects, refrigerating capacity is precisely regulated, the thermal control demands of various all-weather running data rooms and electronic devices are met, and natural cold sources in days and nights, transition seasons and winters can be used to the maximum extent to realize energy conservation and emission reduction of the air conditioning system.

Description

A kind of combined type refrigerant multi-gang air conditioner
Technical field
The present invention relates to refrigeration and air-conditioning technical field, be specifically related to a kind of can the combined type refrigerant multi-gang air conditioner of maximum using natural cooling source low cost transfer heat.
Background technology
The fast development of information industry and digital Construction, promoted the quantity of data center module, communication base station, construction scale increases fast, and the energy consumption of machine room, base station air conditioner accounts for 40% ~ 50% of its total energy consumption according to statistics.The sensible heat load of machine room, base station is than large, continuous cooling is needed to run throughout the year, in the season of indoor design temperature higher than outdoor environment temperature, especially at low temperature season or cold district, conventional data center module and communication base station air conditioner system still need to continue running refrigerating compressor, refrigeration system inefficiency and easily breaking down, if indoor/outdoor temperature-difference (natural cooling source) low cost transfer heat can be utilized or provide cold for indoor, will greatly reduce energy consumption and the operating cost of air-conditioning system.
Outdoor Cryogenic air is utilized to provide the method for cold to obtain the concern of scholar and engineers and technicians in the industry for indoor, and launch engineering and technological research and application in different forms, as the VMC adopted at present, in addition multi-form gas-gas, air-water heat-exchange system is also had, and the composite air conditioner of application hot pipe technique.
A kind of assistant energy-saving refrigeration apparatus for machine room is disclosed in Chinese utility model patent ZL200720019537.8, when outside air temperature is lower, air-conditioning quits work, and directly outdoor Cryogenic air is delivered to indoor and is used for the equipment coolings such as electronic housing, utilize natural cooling source, reduce air conditioning energy consumption.But the outdoor Cryogenic air of this direct utilization is used for electrical cooling owing to not guaranteeing indoor air quality, outdoor dust, moisture etc. cannot be stopped and enter indoor, easily the electronic equipments such as server be caused damage.
Disclose a kind of natural cold energy heat exchange device for communication base station in Chinese utility model patent ZL201020114596.X, comprise air heat exchanger, indoor fan, outdoor fan and casing thereof.When outdoor temperature is lower, outdoor Cryogenic air introduced, carry out heat exchange with room air, indirect utilization natural cooling source reduces air themperature in base station, reduces base station energy consumption.Although this kind of gas-gas heat exchange can ensure the quality of room air, for thermic load, large and temperature uniformity requires high machine room object, needs huge heat exchange area to overcome the low drawback of airair heat exchanger heat transfer efficiency.
Disclose a kind of air-cooling thermotube-type machine room air-conditioning system in Chinese invention patent CN201010528027.X, this system has compression-type refrigeration and heat pipe circularly cooling two kinds of mode of operations.When outdoor temperature >=20 DEG C, refrigeration mode work, participates in the first refrigeration working medium evaporation endothermic in evaporative condenser of kind of refrigeration cycle, cooling and condensation second refrigeration working medium; As outdoor temperature < 20 DEG C, system is converted to heat pipe circularly cooling pattern, utilizes outdoor Cryogenic air to cool and condensation the second refrigeration working medium, and compression-type refrigeration circulation quits work, thus effectively reduces annual air conditioning energy consumption.This system is utilizing outdoor Cryogenic air cold and the deficiency guaranteeing to compensate in indoor air quality first two system, but compression-type refrigeration and heat pipe circularly cooling two kinds of mode of operations switch at a certain temperature spot, and the natural cooling source of outdoor Cryogenic air is not fully used; For the air-conditioning system performing GB/T 19413-2010, because indoor design temperature is 24 DEG C, compression-type refrigeration is transformed into the outdoor environment temperature of heat pipe circularly cooling must be very low, and the utilization rate of natural cooling source is low.
Utility model patent ZL01278831.7 discloses a kind of energy-saving refrigeration cycling devices with circulating pump, in the heat pipe circulatory system, use circulating pump to be conducive to improving the operating efficiency of heat pipe circulation, also simplify the requirement to condenser, reservoir and evaporimeter relative position when hot-pipe system is installed, but the deficiency of ZL01278831.7 in the cold of the outdoor Cryogenic air of maximum using and CN201010528027.X similar, i.e. the ceiling temperature of heat pipe periodic duty must lowlyer steadily could be connected with kind of refrigeration cycle.
The promotion of the informationization technology development such as large data, cloud computing, Large-scale Data Rooms area developed into thousands of ~ hundreds thousand of square metres, unit are heat flow density rises to more than the 35kW of supercomputer system from 5kW, creates more powerful efficient air-conditioning system and combination and the needs of control mode more flexibly.
Summary of the invention
Still need to run the deficiencies such as the high energy consumption that produces of vapor compression refrigeration and reliability at low temperature season for avoiding computer-room air conditioning system; meet the air conditioning requirements of hundreds of ~ tens thousand of kW capacity of Large-scale Data Rooms; and solve combined type refrigerant air-conditioning system multi-machine parallel connection technology and the problem such as refrigerating capacity adjustment and energy hole; utilize natural cooling source substantially; realize the scale of combined air conditioner product, high efficiency production and application, the invention provides a kind of combined type refrigerant multi-gang air conditioner.
The present invention is that technical solution problem adopts following technical scheme:
The design feature of combined type refrigerant multi-gang air conditioner of the present invention is: described multi-gang air conditioner is the cold source system arranging two or more outdoor combined type refrigerant module composition multi-gang air conditioner in outside, arrange the indoor air-cooler module of one or more direct-evaporation-type in indoor, refrigerant Storing and conveying unit is connected between described outdoor combined type refrigerant module and indoor air-cooler module by collector tube, feed flow house steward and return-air house steward and forms closed circulation system;
Described outdoor combined type refrigerant module is consisted of heat exchanger compound the Vapor Compression Refrigeration Cycle loop of the first refrigerant and the compound-refrigerating closed circuit of the second refrigerant, and by the second refrigerant to indoor air-cooler module conveying cold; Described Vapor Compression Refrigeration Cycle loop sets gradually as evaporation channel in air-cooled condenser, throttle mechanism and heat exchanger in compressor, air-cooled heat exchange assembly by the flow direction of the first refrigerant; The high pressure gas side of described compressor is connected with the entrance of air-cooled condenser, low pressure air suction side is connected with the outlet of evaporation channel; Described compressor is the parallel combination of two fixed refrigeration compressors frequently; Described compound-refrigerating closed circuit has compound-refrigerating operating path and vapor compression refrigeration operating path; Described compound-refrigerating operating path is: the second refrigerant imports in entrance branch connection valve, the air cooling heat exchanger successively in the second magnetic valve, air-cooled heat exchange assembly and the condensation channel in heat exchanger, and derives in fluid arm connection valve; Described vapor compression refrigeration operating path is: the second refrigerant imports in described entrance branch connection valve, derives successively after the condensation channel in the first magnetic valve and heat exchanger in described outlet stool connection valve; Described heat exchanger adopts plate type heat exchanger or shell pipe type condensation evaporator; In described air-cooled heat exchange assembly, arranging blower fan is shared blower fan for described air cooling heat exchanger and described air-cooled condenser;
Described indoor air-cooler module is made up of evaporimeter, evaporation fan and flow control valve, the outlet branch road connection valve of each indoor air-cooler module is connected in parallel to return-air house steward, and is connected with the entrance branch connection valve of each outdoor combined type refrigerant module by described return-air house steward; Described flow control valve is arranged on the arrival end of described evaporimeter, and the temperature-sensing element of described flow control valve is arranged on the tube wall of the port of export of described evaporimeter; Described flow control valve is ratio adjusting valve, the refrigerant temperature signal of evaporator outlet is converted to pressure signal by described temperature-sensing element, and be passed to flow control valve by capillary, the aperture of adjust flux control valve, thus control the liquid supply rate of evaporimeter and the degree of superheat of outlet thereof;
Described refrigerant Storing and conveying unit comprises reservoir and liquid pump, the input of described reservoir is connected with the fluid arm connection valve in each outdoor combined type refrigerant module by collector tube, and the output of described reservoir is by liquid pump and be connected with the import branch road connection valve of each indoor air-cooler module through feed flow house steward;
Be provided with excessive tracheae at the top of described reservoir, described excessive tracheae is connected with return-air house steward by check valve, and described check valve is with the flow direction one-way conduction of reservoir towards return-air house steward.
The design feature of combined type refrigerant multi-gang air conditioner of the present invention is also: in described air-cooled heat exchange assembly, air cooling heat exchanger and air-cooled condenser all adopt parallel-flow heat exchanger, and in face of wind direction parallel side-by-side, described air cooling heat exchanger is positioned at inlet air side, air-cooled condenser is positioned at air side, and forms an air channel with described blower fan.
The design feature of combined type refrigerant multi-gang air conditioner of the present invention is also: in described refrigerant Storing and conveying unit, liquid pump is for fixed canned motor pump is frequently to keep stablizing for fluid head, bypass pipe and by-passing valve are set between feed flow house steward and reservoir, the aperture of described by-passing valve controls by its inlet pressure, the large then aperture of pressure is large, and vice versa.
The design feature of combined type refrigerant multi-gang air conditioner of the present invention is also: described blower fan be at a high speed, the third gear step speed regulation blower fan of middling speed and stopping.
The design feature of combined type refrigerant multi-gang air conditioner of the present invention is also: described first refrigerant selects R410A, R417, R22, R134a, R290 or R32 cold-producing medium, or select natural refrigerant R744, described second refrigerant selects R134a, R22, R290 or R32 cold-producing medium.
The control method of combined type refrigerant multi-gang air conditioner of the present invention is: arrange two kinds of different working modes that described multi-gang air conditioner is vapor compression refrigeration and compound-refrigerating, and have:
At Δ T aunder the operating mode of <A, run the mode of operation of vapor compression refrigeration;
At Δ T aunder the operating mode of>=A, run the mode of operation of compound-refrigerating;
Wherein: Δ T a=T h– T a, T hfor the measured value of the second refrigerant real time temperature in return-air house steward, T afor the measured value of outdoor environment temperature, A is setting value.
The feature of the control method of combined type refrigerant multi-gang air conditioner of the present invention is also:
The mode of operation of described vapor compression refrigeration refers to: the cold of combined type refrigerant multi-gang air conditioner all provided by operation vapor compression refrigeration; Under the mode of operation of described vapor compression refrigeration, compressor in the outdoor combined type refrigerant module put into operation and fan operation, the first magnetic valve are opened, the second closed electromagnetic valve, second refrigerant is by entrance branch connection valve and the first magnetic valve, in the condensation channel of heat exchanger, carry out heat exchange with the first refrigerant in evaporation channel, after the second refrigerant exothermic condensation, enter reservoir through fluid arm connection valve and collector tube; For certain outdoor combined type refrigerant module, only when two compressors all quit work, the blower fan of this outdoor combined type refrigerant module is just out of service, and the first magnetic valve and the second closed electromagnetic valve;
The adjustment of refrigerating capacity is realized by the loading of compressor or off-load, and its control method is:
If meet B – Δ B≤T b≤ B+ Δ B, maintains compressor operating quantity constant;
If meet B+ Δ B<T b, start off-duty compressor one by one and load;
If meet T b<B – Δ B, stops the compressor having run to carry out off-load one by one;
Wherein: B is the design temperature of the second refrigerant in reservoir, Δ B is the control deviation of B, T bfor the real time temperature detected value of the second refrigerant in reservoir.
The control method of combined type refrigerant multi-gang air conditioner of the present invention be also in:
The mode of operation of described compound-refrigerating refers to: preferentially utilize air cooling heat exchanger to provide cold, and not enough cold is supplemented by the operation number of units controlling refrigeration compressor; The control mode of described compound-refrigerating is: if outside has refrigeration compressor to run, the then blower fan high-speed cruising of all outdoor combined type refrigerant modules in cold source system, first closed electromagnetic valve, the second magnetic valve are opened, second refrigerant is by entrance branch connection valve, the second magnetic valve, first heat release in air cooling heat exchanger, then by the further heat release of condensation channel of heat exchanger, enter collector tube through fluid arm connection valve, then flow into reservoir;
Under the mode of operation of described combined type refrigerant, the loading of compressor or the control method of off-load are:
If meet B – Δ B≤T b≤ B+ Δ B, maintains compressor operating quantity constant;
If meet B+ Δ B<T b, start off-duty compressor one by one and load, until have a compressor to devote oneself to work in each outdoor compound-refrigerating module, if still meet B+ Δ B<T afterwards b, then carry out second compressor loads that second takes turns outdoor compound-refrigerating module;
If meet T b<B – Δ B, stops the compressor having run to carry out off-load one by one, until only have a compressor operating, if still meet T afterwards in each outdoor compound-refrigerating module b<B – Δ B, then carry out second and take turns off-load, until the compressor of all outdoor compound-refrigerating modules all quits work.
The control method of combined type refrigerant multi-gang air conditioner of the present invention is also:
Under the mode of operation of compound-refrigerating, when indoor thermic load is lower than the cold provided by air cooling heat exchanger, all compressors quit work; Regulate refrigerating capacity according to the following rules:
If meet B – Δ B≤T b≤ B+ Δ B, maintain fan operation quantity and speed constant;
If meet T b<B – Δ B, the rotating speed reducing blower fan is one by one middling speed, if still meet T afterwards b<B – Δ B, then stop the operation of blower fan one by one;
Make to meet B+ Δ B<T when operating mode changes btime, run blower fan one by one with middling speed, if still meet B+ Δ B<T afterwards b, then rotation speed of fan is improved one by one to high speed.
The control method of combined type refrigerant multi-gang air conditioner of the present invention is also:
For outdoor combined type refrigerant modules all in described system, adopt and first open, the method for operation on duty by turns of first stopping carries out work; For compressors all in described system, same employing is first opened, and the method for operation on duty by turns of first stopping carries out work, and the start and stop interval time arranging each compressor is 3 ~ 5 minutes.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the air-cooled freezing by change of state new technology of Integrated predict model of the present invention steam compression type refrigerating and low-power consumption natural cooling source scale application; carry out operating mode according to indoor/outdoor temperature-difference and indoor heat load situation to switch and refrigerating capacity adjustment; the applications expanding of the compound-refrigerating circulating working mode operation temperature area of application natural cooling source; avoid indoor/outdoor temperature-difference less time natural cooling source not enough and must single operation vapor compression refrigeration mode of operation; maximum using natural cooling source can be realized, reach air-conditioner set low cost movement and energy-conservation object.
2, the outside of multi-gang air conditioner of the present invention is by the cold source system of two or more outdoor combined type refrigerant module composition multi-gang air conditioner, can according to the outdoor quantity of combined type refrigerant module of air-conditioning design load flexible configuration and the quantity of indoor air-cooler module, load coupling and air-conditioning system increase-volume are conveniently; Outdoor combined type refrigerant module adopts double-compressor parallel to arrange, and the energy adjustment precision of multi-compressor system improves, and when single compressor works, condensing heat exchanger area is large, and the refrigeration system thermal efficiency is high; As certain compressor fault; be unlikely to this outdoor combined type refrigerant module failure to shut down, even if certain outdoor combined type refrigerant module breaks down, be also convenient to rapid-maintenance or replacing; can not have large impact to the running quality of data center air-conditioner system, reliability is high.
3, the air cooling heat exchanger of outdoor combined type refrigerant module, air-cooled condenser are become air-cooled heat exchange assembly with fan design by the present invention, are of value to improve production efficiency and product quality; Air cooling heat exchanger, air-cooled condenser are aluminium matter micro-channel parallel flow structure, and its light weight, volume are little, and heat transfer efficiency is high, obviously can reduce heat transfer temperature difference, improve system thermal efficiency; Two heat exchangers share a fan passage and make space structure compact, and system layout is attractive in appearance, and cost is low.
4, air-cooled condenser is the critical component of vapor-compression cycle system, and function is cooling, condensation and cross the cold-producing medium of cold HTHP, is to work under the environment of high, middle temperature in outdoor, and under middle temperature environment, the heat transfer temperature difference of air-cooled condenser is large, heat-transfer capability is rich; Air cooling heat exchanger only just works in outdoor is, under the environment of low temperature, and utilizing natural cooling source Some substitute or substitute the compressor cooling of high power consumption completely, is the key that the present invention produces significantly energy-saving effect; Air cooling heat exchanger and air-cooled condenser are separately positioned on inlet air side and air side, both only work under outdoor is the condition of middle temperature simultaneously, air cooling heat exchanger is arranged on inlet air side, both the refrigerating capacity of air cooling heat exchanger had been increased, improve the efficiency utilizing natural cooling source, air temperature rise through air cooling heat exchanger heating is less than 10 DEG C, has positive effect to the reliability of the operation of vapor-compression cycle system high efficiency and raising refrigeration system.
5, the present invention arranges refrigerant Storing and conveying unit, configuration Large Copacity second refrigerant reservoir, and thermal capacity is large, and can respond, wide cut frequent by tune object thermic load fast and change, good stability, degree of regulation is high; Liquid pump carries the second refrigerant to be indoor centralized cycle cooling, and power cycle reliability is high, does not limit by installation site; Second refrigerant carries out phase-change heat-exchange at release end of heat and endotherm section, and heat transfer coefficient is large, heat exchange efficiency is high, and heat exchanger structure is compact, avoid employing gas-gas or air-water heat exchanger heat transfer efficiency low, the problem that heat exchanger area is huge, and circular flow is little, and conveying merit is little; Adopt liquid pump forced circulation, liquid supply rate is stablized, and Flow-rate adjustment is convenient, accurate; Liquid pump pressure head can carry out optimum Match according to feed flow distance, drop and SR, is beneficial to the precise hard_drawn tuhes of air-conditioner temperature.
6, combined type refrigerant multi-gang air conditioner of the present invention adopts multiple outdoor combined type refrigerant module; two fixed refrigeration compressors are frequently had in each outdoor combined type refrigerant module; refrigerating capacity adjustment is carried out by compressor startup-shutdown; avoid poor efficiency when Refrigerating Compressor with Inverter operates in the slow-speed of revolution; it also avoid the electromagnetic interference using converter plant to produce simultaneously, reduce fault rate and the manufacturing cost of multi-gang air conditioner.
Accompanying drawing explanation
Fig. 1 is combined type refrigerant multi-gang air conditioner block diagram of the present invention;
Fig. 2 is outdoor combined type refrigerant block diagram in the present invention;
Fig. 3 a is the main TV structure schematic diagram of air-cooled heat exchange assembly in the present invention;
Fig. 3 b is air-cooled heat exchange assembly side-looking structural representation in the present invention;
Fig. 4 is indoor air-cooler block diagram in the present invention;
Fig. 5 is combined type refrigerant multi-gang air conditioner energy adjustment of the present invention planning schematic diagram;
Number in the figure: 1 outdoor combined type refrigerant module, 2 refrigerant Storing and conveying unit, 3 indoor air-cooler modules, 4 collector tubes, 5 feed flow house stewards, 6 return-air house stewards, 11 compressors, 12 air-cooled heat exchange assemblies, 121 air cooling heat exchangers, 122 air-cooled condensers, 123 blower fans, 13 throttle mechanisms, 14 heat exchangers, 141 evaporation channels, 142 condensation channels, 151 entrance branch connection valves, 152 fluid arm connection valves, 16 first magnetic valves, 17 second magnetic valves, 21 liquid pumps, 22 reservoirs, 23 bypass pipes, 24 by-passing valves, 25 excessive tracheaes, 26 check valves, 31 evaporimeters, 32 evaporation fans, 33 flow control valves, 34 capillaries, 35 temperature-sensing elements, 361 import branch road connection valves, 362 outlet branch road connection valves.
Detailed description of the invention
See Fig. 1 and Fig. 2, in the present embodiment, the vibrational power flow of combined type refrigerant multi-gang air conditioner is: arrange the cold source system that two or more outdoor combined type refrigerant module 1 forms multi-gang air conditioner in outside, arrange the indoor air-cooler module 3 of one or more direct-evaporation-type in indoor, refrigerant Storing and conveying unit 2 is connected between outdoor combined type refrigerant module 1 and indoor air-cooler module 3 by collector tube 4, feed flow house steward 5 and return-air house steward 6 and forms closed circulation system.
As shown in Figure 2, in the present embodiment, outdoor combined type refrigerant module 1 is consisted of heat exchanger 14 compound the Vapor Compression Refrigeration Cycle loop of the first refrigerant and the compound-refrigerating closed circuit of the second refrigerant, and carries cold by the second refrigerant to indoor air-cooler module 3; Vapor Compression Refrigeration Cycle loop sets gradually as evaporation channel 141 in the air-cooled condenser 122 in compressor 11, air-cooled heat exchange assembly 12, throttle mechanism 13 and heat exchanger 14 by the flow direction of the first refrigerant; The high pressure gas side of compressor 11 is connected with the entrance of air-cooled condenser 122, low pressure air suction side is connected with the outlet of evaporation channel 141; Compressor 11 is the parallel combination of two fixed refrigeration compressors frequently; Compound-refrigerating closed circuit has compound-refrigerating operating path and vapor compression refrigeration operating path; Compound-refrigerating operating path is: the second refrigerant imports in entrance branch connection valve 151, air cooling heat exchanger 121 in the second magnetic valve 17, air-cooled heat exchange assembly 12 and the condensation channel 142 in heat exchanger 14 successively, and derive in fluid arm connection valve 152; Vapor compression refrigeration operating path is: the second refrigerant imports in entrance branch connection valve 151, derives successively after the condensation channel 142 in the first magnetic valve 16 and heat exchanger 14 in outlet stool connection valve 152; Heat exchanger 14 adopts plate type heat exchanger or shell pipe type condensation evaporator; In air-cooled heat exchange assembly 12, arranging blower fan 123 is shared blower fans for air cooling heat exchanger 121 and air-cooled condenser 122, blower fan 123 be at a high speed, the third gear step speed regulation blower fan of middling speed and stopping; First refrigerant selects R410A, R417, R22, R134a, R290 or R32 cold-producing medium, or selects natural refrigerant R744, and the second refrigerant selects R134a, R22, R290 or R32 cold-producing medium.
See Fig. 4, in the present embodiment, indoor air-cooler module 3 is made up of evaporimeter 31, evaporation fan 32 and flow control valve 33, the outlet branch road connection valve 362 of each indoor air-cooler module 3 is connected in parallel to return-air house steward 6, and is connected with the entrance branch connection valve 151 of each outdoor combined type refrigerant module 1 by return-air house steward 6; Flow control valve 33 is arranged on the arrival end of evaporimeter 31, and the temperature-sensing element 35 of flow control valve 33 is arranged on the tube wall of the port of export of evaporimeter 31.Flow control valve 33 is ratio adjusting valve, the refrigerant temperature signal that evaporimeter 31 exports by temperature-sensing element 35 is converted to pressure signal, and be passed to flow control valve 35 by capillary 34, the aperture of adjust flux control valve 33, thus control the liquid supply rate of evaporimeter 31 and the degree of superheat of outlet thereof.
As shown in Figure 1, in the present embodiment, refrigerant Storing and conveying unit 2 comprises reservoir 22 and liquid pump 21, the input of reservoir 22 is connected with the fluid arm connection valve 152 in each outdoor combined type refrigerant module 1 by collector tube 4, and the output of reservoir 22 is by liquid pump 21 and be connected with the import branch road connection valve 361 of each indoor air-cooler module 3 through feed flow house steward 5; Be provided with excessive tracheae 25 at the top of reservoir 22, the tracheae 25 that overflows is connected with return-air house steward 6 by check valve 26, and check valve 26 is with the flow direction one-way conduction of reservoir 22 towards return-air house steward 6.Arrange refrigerant Storing and conveying unit, the second refrigerant reservoir of configuration larger capacity, the large then thermal inertia of liquid storage thermal capacity is large, and can respond, wide cut frequent by tune object thermic load fast and change, for the good stability of liquid temp, air-conditioner temperature precision is high; Liquid pump carries the second refrigerant to be indoor centralized cycle cooling, and power cycle reliability is high, does not limit by installation site; Second refrigerant carries out phase-change heat-exchange at release end of heat and heat absorbing end, and heat transfer coefficient is large, heat exchange efficiency is high, and heat exchanger volume is little, compact conformation, and circular flow is little, and conveying merit is little; Adopt liquid pump forced circulation, liquid supply rate is stablized, and Flow-rate adjustment is convenient, accurate; Liquid pump pressure head can carry out optimum Match according to feed flow distance, drop and SR, is beneficial to the precise hard_drawn tuhes of air-conditioner temperature.
In concrete enforcement, corresponding vibrational power flow also comprises:
As shown in Fig. 2, Fig. 3 a and Fig. 3 b, in air-cooled heat exchange assembly 12, air cooling heat exchanger 121 and air-cooled condenser 122 all adopt parallel-flow heat exchanger, and in face of wind direction parallel side-by-side, air cooling heat exchanger 121 is positioned at inlet air side, air-cooled condenser 122 is positioned at air side, and forming an air channel with blower fan 123, in Fig. 3 a, each arrow is depicted as wind direction.Air-cooled condenser 122 is critical components of vapor-compression cycle system, and function is cooling, condensation and cross the cold-producing medium of cold HTHP, is to work under the environment of high, middle temperature in outdoor, and under middle temperature environment, the heat transfer temperature difference of air-cooled condenser is large, heat-transfer capability is rich; Air cooling heat exchanger 121 works in outdoor is, under the environment of low temperature, and the compressor 11 utilizing natural cooling source Some substitute or substitute high power consumption completely freezes, and is the key that the present invention produces significantly energy-saving effect; Air cooling heat exchanger 121 and air-cooled condenser 122 are separately positioned on inlet air side and air side, both only work under outdoor is the condition of middle temperature simultaneously, air cooling heat exchanger 121 is arranged on inlet air side, both the refrigerating capacity of air cooling heat exchanger 121 had been increased, improve the efficiency utilizing natural cooling source, the air temperature rise of heating through air cooling heat exchanger 121 is less than 10 DEG C, has positive effect to the reliability of the operation of vapor-compression cycle system high efficiency and raising refrigeration system.The air cooling heat exchanger 121 of outdoor combined type refrigerant module 1, air-cooled condenser 122 and blower fan 123 are designed to air-cooled heat exchange assembly, are of value to improve production efficiency and product quality; Air cooling heat exchanger 121, air-cooled condenser 122 adopt aluminium matter micro-channel parallel flow structure, and light weight, volume are little, and heat transfer efficiency is high, obviously can reduce heat transfer temperature difference, improve system thermal efficiency; Two heat exchangers share a fan passage and make space structure compact, and system layout is attractive in appearance, and cost is low.
As shown in Figure 1, in refrigerant Storing and conveying unit 2, liquid pump 21 is for fixed canned motor pump is frequently to keep stablizing for fluid head, bypass pipe 23 and by-passing valve 24 are set between feed flow house steward 5 and reservoir 22, the aperture of by-passing valve 24 controls by its inlet pressure, and pressure greatly then aperture is large, and vice versa.Its objective is: when when indoor, less, flow control valve 33 aperture of thermic load is less, by the second unnecessary refrigerant bypass to reservoir 22, in holding chamber, the evaporating pressure of air-cooler module 3 is relatively stable.
In the present embodiment, the control method of combined type refrigerant multi-gang air conditioner is: arrange two kinds of different working modes that multi-gang air conditioner is vapor compression refrigeration and compound-refrigerating, and have:
At Δ T aunder the operating mode of <A, run the mode of operation of vapor compression refrigeration;
At Δ T aunder the operating mode of>=A, run the mode of operation of compound-refrigerating;
Wherein: Δ T a=T h– T a, T hfor the measured value of the second refrigerant real time temperature in return-air house steward 6, T afor the measured value of outdoor environment temperature, A is setting value.
In concrete enforcement, the mode of operation of vapor compression refrigeration refers to: the cold of combined type refrigerant multi-gang air conditioner all provided by operation vapor compression refrigeration, as the A2-A3 section of Fig. 5, by controlling the operation number of units of refrigeration compressor 11, refrigerating capacity and air conditioner heat load is regulated to match; Under the mode of operation of vapor compression refrigeration, compressor 11 in the outdoor combined type refrigerant module 1 put into operation and blower fan 123 runs, the first magnetic valve 16 is opened, the second magnetic valve 17 cuts out, second refrigerant is by entrance branch connection valve 151 and the first magnetic valve 16, in the condensation channel 142 of heat exchanger 14, carry out heat exchange with the first refrigerant in evaporation channel 141, after the second refrigerant exothermic condensation, enter reservoir 22 through fluid arm connection valve 152 and collector tube 4; For certain outdoor combined type refrigerant module 1, only when two compressors 11 all quit work, the blower fan 123 of this outdoor combined type refrigerant module 1 is just out of service, and the first magnetic valve 16 and the second magnetic valve 17 are closed;
The adjustment of refrigerating capacity is realized by the loading of compressor 11 or off-load, and its control method is:
If meet B – Δ B≤T b≤ B+ Δ B, it is constant that maintenance compressor 11 runs quantity;
If meet B+ Δ B<T b, start off-duty compressor 11 one by one and load;
If meet T b<B – Δ B, stops the compressor 11 run to carry out off-load one by one;
Wherein: B is the design temperature of the second refrigerant in reservoir 22, Δ B is the control deviation of B, T bfor the real time temperature detected value of the second refrigerant in reservoir 22, B and Δ B is setting value, can require setting, be user-friendly to and debug according to air-conditioning object and accuracy of temperature control.
The mode of operation of compound-refrigerating refers to: preferentially utilize air cooling heat exchanger (121) to provide cold, and not enough cold is supplemented by the operation number of units controlling refrigeration compressor 11, and as the A1-A2 section of Fig. 5, the cold that M point air cooling heat exchanger 121 provides is Q 2, run compressor 11 and refrigerating capacity Q be provided 1as a supplement; The control mode of compound-refrigerating is: if outside has refrigeration compressor 11 to run, then blower fan 123 high-speed cruising of all outdoor combined type refrigerant modules 1 in cold source system, maximum using natural cooling source, first magnetic valve 16 cuts out, the second magnetic valve 17 is opened, second refrigerant is by entrance branch connection valve 151, second magnetic valve 17, first heat release in air cooling heat exchanger 121, then by condensation channel 142 heat release further of heat exchanger 14, enter collector tube 4 through fluid arm connection valve 152, then flow into reservoir 22.
Under the mode of operation of combined type refrigerant, the loading of compressor 11 or the control method of off-load are:
If meet B – Δ B≤T b≤ B+ Δ B, it is constant that maintenance compressor 11 runs quantity.
If meet B+ Δ B<T b, start off-duty compressor 11 one by one and load, until after having a compressor 11 to devote oneself to work in each outdoor compound-refrigerating module 1, if still meet B+ Δ B<T afterwards b, then carry out second second compressor 11 of taking turns outdoor compound-refrigerating module 1 and load.
If meet T b<B – Δ B, stops the compressor 11 run to carry out off-load one by one, until after only having a compressor 11 to work in each outdoor compound-refrigerating module 1, if still meet T afterwards b<B – Δ B, then carry out second and take turns off-load, until the compressor 11 of all outdoor compound-refrigerating modules 1 all quits work.
Under the mode of operation of compound-refrigerating, when indoor thermic load is lower than the cold provided by air cooling heat exchanger 121, all compressors 11 quit work, as the A0-A1 section of Fig. 5, combined type refrigerant multi-gang air conditioner operates in the most energy conservation state utilizing natural cooling source completely, in order to ensure for liquid temp and air-conditioner temperature precision, the refrigerating capacity produced with following rule adjustment air cooling heat exchanger 121:
If meet B – Δ B≤T b≤ B+ Δ B, maintenance blower fan 123 runs quantity and speed is constant.
If meet T b<B – Δ B, the rotating speed reducing blower fan 123 is one by one middling speed, if still meet T afterwards b<B – Δ B, then stop the operation of ventilated machine 123 one by one.
Make to meet B+ Δ B<T when operating mode changes btime, run blower fan 123 one by one with middling speed, if still meet B+ Δ B<T afterwards b, then blower fan 123 rotating speed is improved one by one at a high speed, until compressor 11 is started working.
In Fig. 5, abscissa is outdoor environment temperature, and ordinate is energy, comprising: air-conditioning rated heat input, rated heat load, compressor refrigerating capacity, air-cooled refrigerating capacity and air conditioning energy consumption.Wherein A2-A3 section is compressor cooling, and compressor adds off-load and regulates refrigerating capacity; A1-A2 section is compound-refrigerating, air-cooled oepration at full load, and compressor adds off-load and regulates refrigerating capacity; A0-A1 section, compressor quits work, and regulates fan speed to regulate air-cooled refrigerating capacity; In each section, the change of air-conditioning total energy consumption, as bottommost line segment, from high temperature to low temperature, is W1, W2, W3, W4, W5 respectively.
As shown in Figure 5, machine room thermic load is constant at wide warm area; The output refrigerating capacity of vapor compression refrigeration and air-cooled refrigeration increases along with the decline of ring temperature at traffic coverage, needs to carry out energy adjustment and makes it to match with machine room thermic load.A3-A2 section is vapor compression refrigeration work pattern district, and the cold of combined type refrigerant multi-gang air conditioner is all provided by operation vapor compression refrigeration, and run the output of number of units adjustment refrigerating capacity by controlling compressor 11, corresponding energy consumption change is from W1 to W2; A1-A2 section is the compound-refrigerating district of transition season, air cooling heat exchanger 121 oepration at full load maximum using natural cooling source, control compressor 11 and run the output of number of units adjustment refrigerating capacity, corresponding energy consumption change is from W3 to W4, because air-cooled periodic duty effectively reduces the energy consumption of compressor 11, W2>W3; A1-A0 section is low temperature season, machine room thermic load is lower than the cold provided by air cooling heat exchanger (121), all compressors 11 quit work, combined type refrigerant multi-gang air conditioner operates in the most energy conservation state utilizing natural cooling source completely, the refrigerating capacity that control blower fan 123 speed or operation number regulate air cooling heat exchanger 121 to provide, corresponding energy consumption change is from W4 to W5; In wide warm area, the total energy consumption of combined type refrigerant multi-gang air conditioner reduces gradually along with the decline of ring temperature, the use of natural cooling source significantly reduces the total energy consumption of system, as adopted single vapor compression refrigeration, then be changed to W1 to W6 at whole service warm area A3-A0 air conditioning energy consumption, not only energy consumption increases, and also increases the failure risk that vapor compression refrigeration system operates in low temperature environment simultaneously.
For outdoor combined type refrigerant modules 1 all in system, adopt and first open, the method for operation on duty by turns of first stopping carries out work; For compressors 11 all in system, same employing is first opened, and the method for operation on duty by turns of first stopping carries out work, improves the average life span of combined type refrigerant multi-gang air conditioner and the utilization rate of critical component; The start and stop interval time pre-setting each compressor 11 is 3 ~ 5 minutes.In actual motion, in refrigerant Storing and conveying unit 2, usually need configuration two liquid pumps 21, to form the operation on duty by turns of the using and the reserved, ensure system operation reliability.
With the air-conditioning of the high-performance computer system of an actual motion for embodiment, the setting wind pushing temperature of enclosed server cabinet is 22 DEG C, return air temperature is 33 DEG C.
In return-air house steward 6, the difference of the second refrigerant temperature and outdoor environment temperature is Δ T a, the setting value of A is 2, if Δ T a<2, runs vapor compression refrigeration mode of operation; If Δ T a>=2, run compound-refrigerating mode of operation.
Can predict: as outside air temperature > 20 DEG C, air-conditioning system operates in vapor compression refrigeration district; During outside air temperature≤20 DEG C, air-conditioning system may operate in compound-refrigerating workspace; Because the usual live load of computer system is in 40 ~ 60% scopes, the operation rule of compound-refrigerating workspace is: oepration at full load is air-cooled to realize maximum using natural cooling source room, when the refrigerating capacity that air cooling heat exchanger 121 produces is more than or equal to thermic load, compressor 11 quits work, air-conditioning system utilizes natural cooling source completely, realizes air-conditioning system low energy consumption and runs.
As Δ T aduring <2, the cold source system of air-conditioner set operates in vapor compression refrigeration mode of operation, and its control method is: compressor 11, blower fan 123, first magnetic valve 16, second magnetic valve 17 of the combined type refrigerant module 1 do not put into operation are all in closed condition; Compressor 11 and the blower fan 123 of the combined type refrigerant module 1 put into operation run, the first magnetic valve 16 is opened, the second magnetic valve 17 closes, second refrigerant is by entrance branch connection valve 151, first magnetic valve 16, heat exchange is carried out with the first refrigerant in evaporation channel 141 in the condensation channel 142 of heat exchanger 14, second refrigerant exothermic condensation, enter collector tube 4 through fluid arm connection valve 152, then flow into reservoir 22.
The temperature and the deviation that set the second refrigerant in reservoir 22 are 18 DEG C ± 1 DEG C, T bfor the real time temperature of the second refrigerant in reservoir 22, the control method of the adding of compressor 11, off-load and energy adjustment is:
If meet 17 DEG C≤T b≤ 19 DEG C, remain unchanged; If meet 19 DEG C of <T b, start compressor 11 one by one and load; If meet T b<17 DEG C, stops compressor 11 to carry out off-load one by one.
As Δ T awhen>=2, the cold source system of air-conditioner set operates in compound-refrigerating mode of operation, and its control law is: preferential operation is air-cooled, and maximum using natural cooling source, not enough cold is supplemented by running compressor cooling.
If outside has refrigeration compressor 11 to run, then blower fan 123 oepration at full load of all combined type refrigerant modules 1 in cold source system, first magnetic valve 16 closes, the second magnetic valve 17 is opened, second refrigerant is by entrance branch connection valve 151, second magnetic valve 17, first heat release in air cooling heat exchanger 121, then by the heat release further of the condensation channel 142 of heat exchanger 14, enter collector tube 4 through fluid arm connection valve 152, then reservoir 22 is flowed into.
When combined type refrigerant multi-gang air conditioner operates in compound-refrigerating mode of operation, the control method of the adding of compressor 11, off-load and energy adjustment is: if meet 17 DEG C≤T b≤ 19 DEG C, remain unchanged; If meet 19 DEG C of <T b, start compressor 11 one by one and load, until after having a compressor 11 to devote oneself to work in each compound-refrigerating module 1, then carry out the loading that second takes turns second compressor 11 of compound-refrigerating module 1; If meet T b<17 DEG C, stops compressor 11 to carry out off-load one by one, until after only having compressor 11 to work in each compound-refrigerating module 1, then carries out second and takes turns off-load, until the compressor 11 of all compound-refrigerating modules 1 all quits work.
When combined type refrigerant multi-gang air conditioner operates in compound-refrigerating mode of operation, when outdoor environment temperature is lower or indoor thermic load is less or two kinds of situations occur simultaneously, after refrigeration compressor 11 is all shut down, the rule of energy adjustment is: if meet T b<17 DEG C, the rotating speed reducing blower fan 123 by setup program is one by one middling speed, if still meet T b<17 DEG C, then stop the operation of blower fan 123 one by one;
When combined type refrigerant multi-gang air conditioner operates in compound-refrigerating mode of operation, after part or all of blower fan 123 is shut down, when outdoor environment temperature gos up or indoor thermic load increases or two kinds of situations occur, if meet 19 DEG C of <T simultaneously b, run blower fan 123 one by one with middling speed, if still meet 19 DEG C of <T b, then the rotating speed of blower fan 123 is improved one by one to high speed, if still meet 19 DEG C of <T b, start compressor 11 and supplement refrigerating capacity deficiency.
In operation, for outdoor combined type refrigerant modules 1 all in system, adopt and first open, the method for operation on duty by turns of first stopping carries out work; For compressors 11 all in system, same employing is first opened, and the method for operation on duty by turns of first stopping carries out work.
It is the air-conditioning objects such as the machine room of 27 DEG C or 24 DEG C that the present invention is used for indoor design temperature, the design temperature T of the second refrigerant in its reservoir 22 bcan suitably adjust, under the condition meeting air-conditioning temperature and refrigerating capacity requirement, the outdoor Cryogenic air of maximum using, as natural cooling source, realizes the low-carbon (LC) operation of air-conditioning system and the high-quality of room air.

Claims (5)

1. a combined type refrigerant multi-gang air conditioner, it is characterized in that: described multi-gang air conditioner arranges the cold source system that two or more outdoor combined type refrigerant module (1) forms multi-gang air conditioner, indoor air-cooler module (3) of one or more direct-evaporation-type is set in indoor, refrigerant Storing and conveying unit (2) is by collector tube (4), feed flow house steward (5) and return-air house steward (6) are connected between described outdoor combined type refrigerant module (1) and indoor air-cooler module (3) and form closed circulation system,
Described outdoor combined type refrigerant module (1) is consisted of heat exchanger (14) compound the Vapor Compression Refrigeration Cycle loop of the first refrigerant and the compound-refrigerating closed circuit of the second refrigerant, and by the second refrigerant to indoor air-cooler module (3) conveying cold; Described Vapor Compression Refrigeration Cycle loop sets gradually as evaporation channel (141) in the air-cooled condenser (122) in compressor (11), air-cooled heat exchange assembly (12), throttle mechanism (13) and heat exchanger (14) by the flow direction of the first refrigerant; The high pressure gas side of described compressor (11) is connected with the entrance of air-cooled condenser (122), low pressure air suction side is connected with the outlet of evaporation channel (141); Described compressor (11) is the parallel combination of two fixed refrigeration compressors frequently; Described compound-refrigerating closed circuit has compound-refrigerating operating path and vapor compression refrigeration operating path; Described compound-refrigerating operating path is: the second refrigerant imports in entrance branch connection valve (151), air cooling heat exchanger (121) in the second magnetic valve (17), air-cooled heat exchange assembly (12) and the condensation channel (142) in heat exchanger (14) successively, and derive in fluid arm connection valve (152); Described vapor compression refrigeration operating path is: the second refrigerant imports in described entrance branch connection valve (151), derives successively after the condensation channel (142) in the first magnetic valve (16) and heat exchanger (14) in described outlet stool connection valve (152); Described heat exchanger (14) adopts plate type heat exchanger or shell pipe type condensation evaporator; In described air-cooled heat exchange assembly (12), arranging blower fan (123) is shared blower fan for described air cooling heat exchanger (121) and described air-cooled condenser (122);
Described indoor air-cooler module (3) is made up of evaporimeter (31), evaporation fan (32) and flow control valve (33), the outlet branch road connection valve (362) of each indoor air-cooler module (3) is connected in parallel to return-air house steward (6), and is connected by the entrance branch connection valve (151) of described return-air house steward (6) with each outdoor combined type refrigerant module (1); Described flow control valve (33) is arranged on the arrival end of described evaporimeter (31), and the temperature-sensing element (35) of described flow control valve (33) is arranged on the tube wall of the port of export of described evaporimeter (31); Described flow control valve (33) is ratio adjusting valve, the refrigerant temperature signal that evaporimeter (31) exports is converted to pressure signal by described temperature-sensing element (35), and be passed to flow control valve (35) by capillary (34), the aperture of adjust flux control valve (33), thus control the liquid supply rate of evaporimeter (31) and the degree of superheat of outlet thereof;
Described refrigerant Storing and conveying unit (2) comprises reservoir (22) and liquid pump (21), the input of described reservoir (22) is connected with the fluid arm connection valve (152) in each outdoor combined type refrigerant module (1) by collector tube (4), and the output of described reservoir (22) passes through liquid pump (21) and is connected with the import branch road connection valve (361) of each indoor air-cooler module (3) through feed flow house steward (5);
Excessive tracheae (25) is provided with at the top of described reservoir (22), described excessive tracheae (25) is connected with return-air house steward (6) by check valve (26), and described check valve (26) is with the flow direction one-way conduction of reservoir (22) towards return-air house steward (6).
2. combined type refrigerant multi-gang air conditioner according to claim 1, it is characterized in that: in described air-cooled heat exchange assembly (12), air cooling heat exchanger (121) and air-cooled condenser (122) all adopt parallel-flow heat exchanger, and in face of wind direction parallel side-by-side, described air cooling heat exchanger (121) is positioned at inlet air side, air-cooled condenser (122) is positioned at air side, and forms an air channel with described blower fan (123).
3. combined type refrigerant multi-gang air conditioner according to claim 1, it is characterized in that: in described refrigerant Storing and conveying unit (2), liquid pump (21) is for fixed canned motor pump is frequently to keep stablizing for fluid head, bypass pipe (23) and by-passing valve (24) are set between feed flow house steward (5) and reservoir (22), the aperture of described by-passing valve (24) controls by its inlet pressure, the large then aperture of pressure is large, and vice versa.
4. combined type refrigerant multi-gang air conditioner according to claim 1, is characterized in that: described blower fan (123) be at a high speed, the third gear step speed regulation blower fan of middling speed and stopping.
5. combined type refrigerant multi-gang air conditioner according to claim 1, it is characterized in that: described first refrigerant selects R410A, R417, R22, R134a, R290 or R32 cold-producing medium, or select natural refrigerant R744, described second refrigerant selects R134a, R22, R290 or R32 cold-producing medium.
CN201410549491.5A 2014-10-16 2014-10-16 A kind of combined type refrigerant multi-gang air conditioner CN104251529B (en)

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CN111121153A (en) * 2019-12-20 2020-05-08 宁波奥克斯电气股份有限公司 Multi-connected indoor unit and fresh air fan hybrid system and control method thereof

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