CN104676780A - Central air conditioner fresh air handling unit structure and operating method thereof - Google Patents
Central air conditioner fresh air handling unit structure and operating method thereof Download PDFInfo
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- CN104676780A CN104676780A CN201510114881.4A CN201510114881A CN104676780A CN 104676780 A CN104676780 A CN 104676780A CN 201510114881 A CN201510114881 A CN 201510114881A CN 104676780 A CN104676780 A CN 104676780A
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- air
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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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
- F24F3/06—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 arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a central air conditioner fresh air handling unit structure and an operating method thereof. An air conveying device is connected with an expansion machine, the expansion machine is connected with a mixer, the mixer is connected with a heater, the air is inputted to an evaporator after being compressed by an air compressor, and mainstream air is cooled in the evaporator; the low-temperature mainstream air is dried by virtue of a dryer; the low-temperature mainstream air passing by the dryer enters the expansion machine to be expanded and re-cooled, and then the cooled mainstream air can be mixed with secondary stream air which is supplied by a secondary air supply unit in the mixer. The fresh air machine is pollution-free, the fresh air does not contact returned air of an indoor exhaust system, so that the indoor returned air pollution can be avoided; the energy is saved, and the energy consumption is reduced; the exhaust air rate of the fresh air machine is multiplied compared with that of the air compressor, the equipment scale of the fresh air machine is reduced, the exhaust air rate, the humidity content and the exhaust air temperature of the fresh air machine are adjustable, and the user application system equipment is simplified; the electric heater rapidly responds to the cold-heat load variation of a target user.
Description
Technical field
The present invention relates to air-conditioning system apparatus field, particularly, relate to a kind of central air conditioning Fresh air handling units structure and method of work thereof.
Background technology
The power supply that gas turbine forms with heat exchanger and refrigeration machine in cooling heating and power generation system, heat supply, cold supply system.In this system, gas turbine is nucleus equipment.One of feature of gas turbine is: combustion chamber is the core component of gas turbine, use liquid or aerochemistry fuel, in air, ingredient oxygen is oxidant, oxygen and fuel combustion generating gas, comprise carbon monoxide, carbon dioxide and oxynitrides in combustion gas, its thermodynamic cycle comprises physical and chemical changes; Two of feature is: compressor and turbine coaxial, driven by turbine, the acting ability of turbine is restricted gas high-temperature and discharges.The defect that These characteristics causes gas turbine to exist in generating and cooling heating and power generation system application is: the combustion gas of gas turbine discharge can not directly should in indoor, large energy is caused to enter air in company with the gas of discharging, reduce input energy sources utilization rate, simultaneously contaminated environment again, above-mentioned defect is that gas turbine prior art cannot overcome.Gas power generator is BCHP(note: BCHP is heat-electricity-cold combined supply) key equipment.According to analysis, only have its generating efficiency to reach 40, BCHP percent and just really there is energy-saving significance.The miniature combustion engine generating efficiency of current tens to hundreds of kilowatt is less than 30 percent, and MW class internal combustion engine generating efficiency can close to 40 percent, but the oxynitrides of discharge is higher than gas fired-boiler, does not meet environmental requirement.Penetration and promotion with gas turbine be core the negative effect of cooling heating and power generation system to local environment, also should not ignore the pressure of liquid-gas fired supply.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of central air conditioning Fresh air handling units structure and method of work thereof, this structure and method take air as working medium for what use on ground, pressure, temperature, water capacity, variable density is only had in thermodynamic cycle process, produce without any pollution, and mixing without intersecting with air-conditioning gas extraction system, air exhaust temperature, water capacity can be controlled; The central air-conditioning system Fresh air handling units that the mechanical power produced in thermodynamic cycle process can be exported with electrical energy form.
The present invention's adopted technical scheme that solves the problem is: a kind of central air conditioning Fresh air handling units structure, comprise air delivery device, described air delivery device is connected with decompressor, and decompressor is connected with blender, and blender is connected with heater.The technical program overcome apply in cooling heating and power generation system gas turbine, heat exchanger and refrigeration machine composition power supply, cooling, heating system above-mentioned shortcoming, the technical scheme that structure is taked combines with compressor and evaporimeter, decompressor, air mixer, heater, adopt the Fresh air handling units of this structure as the new wind regime of targeted customer's application system, new blower fan does not produce pollution, new wind and indoor exhaust system return air contactless, therefore do not pollute by indoor return air; Energy-conservation; New blower fan exhaust air rate is than the multiplication of compressor exhaust air rate, and new Fan Equipment scale reduces, and new blower fan capacity, water capacity, delivery temperature is adjustable, and user's application system equipment simplifies; Electric heater provides quick response to the change of targeted customer's cooling and heating load.This programme is that what to use on ground is working medium with air, only has pressure, temperature, water capacity, variable density, produces without any pollution, and mixing without intersecting with air-conditioning gas extraction system, can control air exhaust temperature, water capacity in thermodynamic cycle process; The new blower fan structure of central air-conditioning system that the mechanical power produced in thermodynamic cycle process can be exported with electrical energy form.
Air delivery device comprises the compressor, evaporimeter and the drier that connect successively, drier is connected with decompressor one end away from blender, described decompressor is connected with generating set, the output power cable of generating set is with evaporimeter Alternative Refrigerant Compressors power input or be connected with power supply network, and blender is connected with secondary blast unit away from one end of decompressor.
Blender comprises main flow air inlet pipe, Secondary Flow inlet channel, main flow arm, mixing chamber and Secondary Flow air inlet pipe, main flow air inlet pipe one end is stretched in mixing chamber, the other end is connected with decompressor after stretching out mixing chamber, main flow arm circumference is evenly fixed on the outer wall of main flow air inlet pipe, and main flow arm is all communicated with main flow air inlet pipe inside, main flow arm is arranged in mixing chamber; Secondary Flow inlet channel is fixed on the outer wall of mixing chamber, and Secondary Flow inlet channel is communicated with mixing chamber inside, Secondary Flow air inlet pipe is arranged on mixing chamber outside, and Secondary Flow air inlet pipe one end is communicated with Secondary Flow inlet channel, and the other end is connected with secondary blast unit.Blender main flow air inlet pipe is connected with expander exhaust gas pipe, and the Secondary Flow air inlet pipe of blender is connected with the exhaust outlet of air blast, and the gas outlet of blender is connected with electric heater air inlet.Cryogenic gas from decompressor and the surrounding air from air blast mix in a mixer, ambient air wet down, cooling in mixed process, and mixing air water capacity and air themperature are all lower than water capacity and the temperature of ambient air.Change expander exhaust gas amount and the ratio of secondary air flow and just can obtain the water capacity of different gaseous mixtures, temperature and resh air requirement, the blender be connected with the blast pipe of decompressor can be one or more, to meet the needs of targeted customer's difference purposes.
Secondary blast unit is air blast, and air blast is communicated with Secondary Flow air inlet pipe one end away from Secondary Flow inlet channel, and air blast is centrifugal or one in axial blower, the controller of described air blast is provided with RS485 communication interface; Evaporimeter is the one in ammonia evaporator or evaporator with heat pump, the controller of evaporimeter is provided with RS485 communication interface; Decompressor is the one of adjustable one-stage centrifugal turbine, centripetal radial turbine, axial flow turbine decompressor or the screw expander of guide ring; The controller of described decompressor is provided with RS485 communication interface; Generating set is the one in Synchronous generator or asynchronous generating unit, the controller of generating set is provided with RS485 communication interface; Drier is the one of moisture trap, absorption type dryer or absorption drier; Described compressor is the one of water-cooled or air cooling centrifugal-flow compressor, axial-flow compressor or spiral lobe compressor, the controller of compressor is provided with RS485 communication interface, and compressor adopts stepless speed regulation structure; Heater is the one during electric heater or electric heater and heat pump condenser combine, and the input power of heater is stepless speed regulation, the controller of heater is provided with RS485 communication interface; Described heater is connected with blast pipe away from one end of blender; Described compressor is connected with air inlet pipe away from one end of evaporimeter.Blast pipe is connected with heater, function be by new blower fan process after air transport to follow-up application system.
A method of work for central air conditioning Fresh air handling units, comprises the following steps:
A () employing exit flow pressure is 3-6 atmospheric pressure, exit flow temperature is, after the compressor compressed air of 35 DEG C-45 DEG C, air is inputted evaporimeter, form primary air, primary air cools in evaporimeter, and the temperature that air discharged by compressor by evaporimeter is reduced to 5-20 degree Celsius;
B the low temperature primary air exported in evaporimeter in step (a) is carried out drying by drier by (), drier is for removing the drop in low temperature primary air, reduce the water capacity of low temperature primary air, and therefore reduce the damage of drop icing equipment caused in expander process;
C () low temperature primary air after drier enters decompressor and carries out expansion and again lower the temperature, the gas outlet air themperature of decompressor reaches subzero 50-70 degrees Celsius, the primary air expanded after lowering the temperature mixes in a mixer with the Secondary Flow air that secondary blast unit passes into blender, through the water capacity of the unit volume of mixed gas and gaseous mixture temperature all than Secondary Flow air humidity content and temperature low, the flow-rate ratio of adjustment main flow and Secondary Flow adjusts the water capacity of air Mixture, the blower speed adjusted in compressor and secondary blast unit realizes the change controlling main flow and Secondary Flow flow,
D the boundary condition of () water capacity adjustment is: the new air temperature that blender gas outlet gas flow temperature must need lower than target user system; Blender gas outlet stream pressure must not lower than the minimum pressure of target user system requirement after counting heater pressure loss, and the air that blender is discharged is heated to the temperature range that target user system requires in the heater.
According to target user's central air-conditioning system technological requirement regulates the water capacity of the rear air-flow of mixing, thus the precision that the dehumidification equipment simplified in user's application system and the indoor water capacity of raising control, in a mixer because the temperature of air and water capacity are recovered, large discharge Secondary Flow air can be received, thus make new blower fan capacity be the 2-5 of compressor flow doubly, the air that Secondary Flow air brings can make the power for improving the heater required for mixture temperature reduce.
In those skilled in the art's eye, new blower fan is a kind of effective air cleaning facility, room air can be made to produce circulation, on the one hand outside the air discharge chamber of foul indoor, on the other hand outdoor ozone through sterilization, sterilization, after the measures such as filtration, be input to indoor again, allowing in room is all the air of fresh clean all the time, new blower fan uses new wind convection current patented technology, by independently blowing and air inducing, room air is made to realize convection current, thus at utmost change carry out room air displacement, it is healthy that the built-in multifunctional purifying system of new blower fan ensures to enter indoor air cleaning.It mainly purifies air, do not consider adjustment air being carried out to temperature, water capacity and pressure, those skilled in the art recognize that: strengthen outdoor air volume upon indoor air quality and possess unrivaled superiority, but increase the restriction that resh air requirement is subject to Fresh air handing ability.In existing air-conditioner set, use multiple functional section to realize the different disposal process of air, equipment and runing adjustment all more complicated, how building the sweetly disposition that can meet annual full working scope is again the required problem solved of fresh air processor with regulating.The defect that it is the power supply of core, heat exchanger and refrigeration machine composition that a kind of central air conditioning Fresh air handling units structure disclosed by the invention overcomes with gas turbine, heat supply, cold supply system exist, simultaneously also provides a kind of effective technology for overcoming the problems referred to above existed in existing air-conditioner set.
The present invention combines the function of air-conditioning and new blower fan, equipment and runing adjustment are all fairly simple, carrying out temperature, purify the air of a room while water capacity adjustment, and new blower fan does not produce pollution, new wind and indoor exhaust system return air contactless, therefore pollute without indoor return air, reduce energy resource consumption, electric heater provides quick response to the change of targeted customer's cooling and heating load, new blower fan exhaust air rate doubles than compressor exhaust air rate, new Fan Equipment scale reduces, new blower fan capacity, water capacity, delivery temperature is adjustable, user's application system equipment simplifies, meet sweetly disposition and the adjustment of annual full working scope.
To sum up, the invention has the beneficial effects as follows:
Compare with miniature gas turbine-heat exchanger-refrigeration machine air-conditioner set, (1) new blower fan does not produce pollution, new wind and indoor exhaust system return air contactless, therefore pollute without indoor return air;
(2) energy-conservation, reduce energy resource consumption;
(3) new blower fan exhaust air rate is than the multiplication of compressor exhaust air rate, and new Fan Equipment scale reduces, and new blower fan capacity, water capacity, delivery temperature is adjustable, and user's application system equipment simplifies;
(4) electric heater provides quick response to the change of targeted customer's cooling and heating load.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of blender.
Mark and corresponding parts title in accompanying drawing: 1-air inlet pipe; 2-compressor; 3-evaporimeter; 4-drier; 5-decompressor; 6-blender; 6-1-main flow air inlet pipe; 6-2-Secondary Flow inlet channel; 6-3-main flow arm; 6-4-mixing chamber; 6-5-Secondary Flow air inlet pipe; 7-heater; 8-blast pipe; 9-secondary blast unit; 10-generating set.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, to the detailed description further of the present invention's do, but embodiments of the present invention are not limited thereto.
Embodiment 1:
As shown in Figure 1, a kind of central air conditioning Fresh air handling units structure, comprise air delivery device, described air delivery device is connected with decompressor 5, and decompressor 5 is connected with blender 6, and blender 6 is connected with heater 7.The technical program is relative to using on a large scale, also be applicable to use in the drying having compressed air source, refrigeration, the region such as freezing, or in the large area such as office building, market, large space environment, as the environment for use of central air-conditioning, air delivery device input pressure-air, can be self pressurize to air, also can be that decompressor is generally used in profound hypothermia equipment directly as the passage of extraneous pressure-air.Pressure-air does work to decompressor, reaches the object of cooling.Blender 6 is mixed low temperature primary air and Secondary Flow air, according to target user's central air-conditioning system technological requirement regulates the water capacity of the rear air-flow of mixing, thus the precision that the dehumidification equipment simplified in user's application system and the indoor water capacity of raising control, in the technical program, blender 6 is the equipment that uniquely can regulate new wind water capacity; Utilize secondary blast unit multiplication resh air requirement, improve equipment use scope and save energy.Because the gas outlet lowest temperature of decompressor 5 can reach subzero 50-70 degrees Celsius, because temperature, water capacity are recovered, receivability large discharge Secondary Flow air, thus making new blower fan capacity be compressor flow several times, the power made as improving the heater 7 required for mixture temperature can reduce by the air that Secondary Flow air brings.Flow multiplication requires relevant with ambient air state with energy-saving effect with the water capacity of targeted customer.Effectively can carry out air feed to user, not pollute generation, the low convenient operation personnel control of energy ezpenditure.
Embodiment 2:
As shown in Figure 1, air delivery device comprises the compressor 2, evaporimeter 3 and the drier 4 that connect successively, drier 4 is connected with decompressor 5 one end away from blender 6, described decompressor 5 is connected with generating set 10, generating set 10 is connected with evaporimeter 3, and blender 6 is connected with secondary blast unit 9 away from one end of decompressor 5.Compressor 2, evaporimeter 3 and drier 4 are all existing equipment, in existing central air conditioning, all apply to above-mentioned parts.
As shown in Figure 2, blender 6 comprises main flow air inlet pipe 6-1, Secondary Flow inlet channel 6-2, main flow arm 6-3, mixing chamber 6-4 and Secondary Flow air inlet pipe 6-5, main flow air inlet pipe 6-1 one end is arranged in mixing chamber 6-4, be connected with decompressor 5 after the other end stretches out mixing chamber 6-4, main flow arm 6-3 is fixed on the outer wall of main flow air inlet pipe 6-1, and main flow arm 6-3 is all communicated with main flow air inlet pipe 6-1 inside, main flow arm 6-3 is arranged in mixing chamber 6-4, Secondary Flow inlet channel 6-2 is fixed on the outer wall of mixing chamber 6-4, and Secondary Flow inlet channel 6-2 is communicated with mixing chamber 6-4 inside, it is outside that Secondary Flow air inlet pipe 6-5 is arranged on mixing chamber 6-4, and Secondary Flow air inlet pipe 6-5 one end is communicated with Secondary Flow inlet channel 6-2, the other end is connected with air blast.Secondary Flow inlet channel 6-2 is welded on the outer wall of mixing chamber 6-4, low temperature primary air in decompressor 5 enters into main flow air inlet pipe 6-1, then under the effect of main flow arm 6-3, mixing chamber 6-4 is entered into, in this process, Secondary Flow air inlet pipe 6-5 constantly passes into extraneous air, mix with low temperature primary air in mixing chamber 6-4, realize the temperature of air, the change of water capacity and pressure, relative to existing new blower fan system, temperature and the water capacity of air-out can be adjusted according to the demand of user, and temperature controls more accurate, relative to air-conditioning, save energy consumption.
The function of evaporimeter 3 is that the temperature of compressor 2 being discharged air is reduced to 5-20 degree Celsius.Evaporimeter 3 can be ammonia evaporator or evaporator with heat pump; Evaporimeter 3 is between compressor 2 and drier 4.
The rotating shaft of decompressor 5 can be connected with generating set 10, and generating set 10 is the one in Synchronous generator or asynchronous generating unit, the controller of generating set 10 is provided with RS485 communication interface.Synchronous generator is directly connected with decompressor rotating shaft, adopts single feedback cutting-in control controller to arrange RS485 or ethernet interface; Then be connected with expansion turbine rotating shaft with gear-box according to asynchronous generating unit, available variable speed constant frequency cutting-in control, controller arranges RS485 or ethernet interface.The controller of decompressor 5 is provided with RS485 communication interface.The accessory system of decompressor comprises lubricating oil system, sealing gland gas system, warning system and emergency stop system.Decompressor 5 function is for blender provides Cryogenic air.Decompressor 5 is adjustable one-stage centrifugal turbine, centripetal radial turbine, axial flow turbine decompressor or the screw expanders of guide ring.
Drier 4, between evaporimeter 3 and decompressor 5, also can be positioned at evaporimeter 3 or front or combine with compressor 2.Its function is the drop for removing in air, reduces the water capacity of air-flow; And therefore reduce the damage of drop icing equipment caused in decompressor 5 expansion process.Drier 4 can be moisture separator, absorption type dryer or absorption drier.While drying, filtration, purification sterilization is carried out to air, avoid dust etc. to enter into next link.
Compressor 2 is between air inlet pipe 1 and evaporimeter 3; Its function sucks ambient air and compressed by ambient air.Compressor 2 is to air acting in compression process, and air pressure and temperature improve.Compressor is with the one in centrifugal, the axial-flow type of cooling device or helical-lobe compressor; It is multistage or single-stage; Stator blade is adjustable or uncontrollable, also can combine integrated drier; Compressor selects exit flow pressure under design condition to be 3-6 atmospheric pressure, and exit flow temperature is ventilation type or the water-cooled compressor of 35 DEG C-45 DEG C.
Heater 7 is the one during electric heater or electric heater and heat pump condenser combine, and the controller of heater 7 is provided with RS485 communication interface, heater 7 input power stepless changing.Heater 7 is between blender 6 and blast pipe 8, and its function is: when blender 6 gas outlet gas flow temperature heats air-flow lower than during the new blower fan air outlet temperature set by central air-conditioning system technological requirement.
Heater 7 is connected with blast pipe 8 away from one end of blender 6; Described compressor 2 is connected with air inlet pipe 1 away from one end of evaporimeter 3.Air inlet pipe 1, compressor 2, evaporimeter 3, drier 4, decompressor 5, blender 6, heater 7, blast pipe 8 link together with metal fastenings successively; The rotating shaft of compressor 2 is separated with decompressor rotating shaft, without connecting.
New blower fan structure disclosed by the invention is combined with following subsystem, namely forms the new blower fan that can effectively work.
Power-supply system belongs to engineering project, comprises 220V, 380V AC and DC low-tension supply, standby battery.380V AC power is electrical source of power, for drive motor and the electricity consumption of the equipment such as electric heater, overfire air fan; Dc source is for monitoring system electricity consumption.
Oil system forms confession, oil return enclosed construction by the action device of metal tube and compressor 2, decompressor 5, generating set, drive motor bearing and geared system bearing bore, gear-box and variable-vane device, provides lubrication and provide to the action device of variable-vane device to drive oil.Oil system can be complete set system, also can be divided into some little autonomous systems and associated components is combined.
The drive motor group of compressor comprises drive motor and rotational speed governor.Drive motor is connected through the rotating shaft of transfer motion speed changing gear case with compressor 2, and adopt frequency conversion rotational speed governor, frequency-variable controller is provided with RS485 or ethernet communication interface.Blower unit comprises axial flow or centrifugal blower and drive motor rotational speed governor.Blower air quantity is more than 2 times of the nominal capacity of compressor 2, can multiple stage in parallel, the exhaust outlet pipeline that metal or engineering plastics are made is connected with the overfiren air port of blender 6, purifying and sterilizing device is provided with in air blast, the air passed through is carried out purifying sterilizing, can not pollute cold sterilization air after making to mix with low temperature primary air, the air that user obtains reaches designing requirement; Drive motor rotating speed should stepless speed regulation; Motor speed controller arranges RS485 or ethernet communication interface.
Configuration monitoring system, for implementing Real-Time Monitoring and control to new fan condition, has multiple design available.(1), consider that new blower fan is a part of central air-conditioning system, the data acquisition process of new blower fan and control system are parts for central air-conditioning system data acquisition process and control system, and system data needs to share; (2) between the duty that, air inlet pipe 1, compressor 2, evaporimeter 3, drier 4, decompressor 5 and blender 6, heater 7 and blast pipe 8 are respective in new blower fan, the degree of correlation is not high, there is not the proportionate relationship determined, it is feasible for adopting each parts independently to control; (3) manufacturing enterprise of each parts is all supporting sale, is conducive to product quality, Support; Therefore the new blower fan that the present invention and accessory system form is that the central air-conditioning system of core adopts collecting and distributing compartment system comparatively suitable, have selected point-to-multipoint half-duplex long distance control system in practical application.
Most important security monitoring parameter is the rotating speed of decompressor 5, start when decompressor rotating speed is greater than setting speed but is less than and allows maximum (top) speed control, alert program send sound and light alarm; When rotating speed continuation increase reaches maximum permissible speed, automatically cut off compressor drive motor power supply, new blower fan and central air-conditioning system and enter the program of quitting work, for ensuring safety, the device of artificial cut-out compressor driving power should be set.
In monitoring system, new blower fan is most important is new wind water capacity and temperature and volume flow by control performance parameter, and these performance parameters are determined by targeted customer's central air-conditioning system technological requirement.In central air-conditioning system is normally run, the change of the hot and cold load of user can occur at any time, for this reason new blower fan state control in establish following method: (1) when user cooling and heating load change primarily of user usage space increase or reduce cause, then first adapted to the change of cooling and heating load by air mass flow adjustment: (2) if cooling and heating load change primarily of variation of ambient temperature or indoor heat load change caused by, then should to regulate new blower fan blender air outlet temperature; For distinguishing above-mentioned two kinds of situations, open and close sensor is set at the air inlet of each independently usage space, indoor set temperature sensor, electric load sensor.(3) when two kinds of situations occur simultaneously, first adjust flux, the new blower fan air outlet temperature of rear adjustment.For making the compressor 2 of new blower fan and decompressor 5 still maintain the work of high efficiency scope when targeted customer's cooling and heating load changes in Flow-rate adjustment, the blow-off system that first air mass flow is arranged by the application system air inlet pipe after new blower fan regulates, and new blower fan air outlet temperature is regulated by heater 7.New wind water capacity is by adjusting compressor flow and air blast flow-rate ratio adjusts.
Secondary blast unit 9 is air blast, and air blast is communicated with away from one end of Secondary Flow inlet channel 6-2 with Secondary Flow air inlet pipe 6-5.The flow of air blast is at least more than the twice of compressor 2.Blender 6 is customed products, structure as shown in Figure 2, air blast 6 be Atlas-science popularization section without oily integrated blower unit, controller arranges RS485 communication interface.
Electric heater comprises mixing chamber, electrothermal tube, power wiring seat and controller, and the power of electric heater is stepless-adjustment.The delivery temperature of electric heater to new blower fan makes accurate adjustment.Controller is provided with RS485 communication interface.Convenient operation personnel carry out the connection of signal of communication according to actual conditions.
Embodiment 3:
A kind of method of work of central air conditioning Fresh air handling units, adopt that exit flow pressure is 3-6 atmospheric pressure, exit flow temperature is the water-cooled of 35 DEG C-45 DEG C or after dry compressor 2 compressed air, air is inputted evaporimeter 3, form primary air, primary air cools in evaporimeter 3, and the temperature that air discharged by compressor 2 is reduced to 5-20 degree Celsius by evaporimeter 3, the low temperature primary air exported in evaporimeter 3 is carried out drying by drier 4, drier 4 is for removing the drop in low temperature primary air, reduce the water capacity of low temperature primary air, and therefore reduce the damage of drop icing equipment caused in decompressor 5 expansion process, low temperature primary air after drier 4 enters decompressor 5 and carries out expansion and again lower the temperature, the gas outlet air themperature of decompressor 5 reaches subzero 50-70 degrees Celsius, the primary air expanded after lowering the temperature mixes in blender 6 with the Secondary Flow air that secondary blast unit 9 passes into blender 6, through the water capacity of the unit volume of mixed gas and gaseous mixture temperature all than Secondary Flow air humidity content and temperature low, the flow-rate ratio of adjustment main flow and Secondary Flow adjusts the water capacity of air Mixture, the blower speed adjusted in compressor 2 and secondary blast unit 9 realizes the change controlling main flow and Secondary Flow flow, the boundary condition of water capacity adjustment is: the new air temperature that blender 6 gas outlet gas flow temperature must need lower than target user system, blender 6 gas outlet stream pressure must not lower than the minimum pressure of target user system requirement after counting heater 7 pressure loss, and the air that blender 6 is discharged is heated to the temperature range that target user system requires in heater 7.
According to target user's central air-conditioning system technological requirement regulates the water capacity of the rear air-flow of mixing, thus the precision that the dehumidification equipment simplified in user's application system and the indoor water capacity of raising control, because the temperature of air and water capacity are recovered in blender 6, large discharge Secondary Flow air can be received, thus make new blower fan capacity be the 2-5 of compressor flow doubly, the air that Secondary Flow air brings can make the power for improving the heater 7 required for mixture temperature reduce, and flow multiplication is by the impact of the factor such as ambient air state, the requirement of target user system water capacity.
From decompressor 5 low temperature primary air with enter the Secondary Flow air of blender 6 (all from ambient air, but due to the process through air delivery device in early stage, temperature, the water capacity of low temperature primary air and Secondary Flow air are all different, the water capacity of Secondary Flow air and temperature are all higher than primary air), blending in blender 6, will be lower than Secondary Flow through the water capacity of the unit volume of mixed gas and the temperature of gaseous mixture, be provided with wettability power, adjustment main flow and Secondary Flow flow-rate ratio just can adjust the water capacity of air Mixture; Main flow and Secondary Flow flow are by adjustment compressor 2 and realize with the external blower rotating speed of blender 6 air feed.Compare with miniature gas turbine-heat exchanger-refrigeration machine air-conditioner set, due to be adopt air directly process and mix, expansion turbine is at swell refrigeration, reclaim the input electric energy of compressor drive motors simultaneously, the air that Secondary Flow carries can supplement mixture temperature and recover institute's energy requirement, and just do not have combustion fumes gas to produce, new blower fan does not produce pollution, new wind and indoor exhaust system return air contactless, therefore pollute without indoor return air; Energy-conservation, expansion turbine is at swell refrigeration, reclaim the input electric energy of compressor drive motor, the air that Secondary Flow carries can supplement the energy needed for mixture temperature recovery, reduce energy resource consumption, the low temperature primary air from decompressor 5 makes air outlet temperature or water capacity adjust with the Secondary Flow air blending in blender 6 entering blender 6; Owing to adding secondary blast unit 9 at blender place, new blower fan exhaust air rate is than the multiplication of compressor exhaust air rate, and new Fan Equipment scale reduces, and new blower fan capacity, water capacity, delivery temperature is adjustable, and user's application system equipment simplifies; Electric heater provides quick response to the change of targeted customer's cooling and heating load.
As mentioned above, the present invention can be realized preferably.
Claims (10)
1. a central air conditioning Fresh air handling units structure, comprises air delivery device, it is characterized in that, described air delivery device is connected with decompressor (5), and decompressor (5) is connected with blender (6), and blender (6) is connected with heater (7).
2. a kind of central air conditioning Fresh air handling units structure according to claim 1, it is characterized in that, described air delivery device comprises the compressor (2), evaporimeter (3) and the drier (4) that connect successively, drier (4) is connected with decompressor (5) one end away from blender (6), described decompressor (5) is connected with generating set (10), generating set (10) is connected with evaporimeter (3), and blender (6) is connected with secondary blast unit (9) away from one end of decompressor (5).
3. a kind of central air conditioning Fresh air handling units structure according to claim 2, it is characterized in that, described blender (6) comprises main flow air inlet pipe (6-1), Secondary Flow inlet channel (6-2) and mixing chamber (6-4), main flow air inlet pipe (6-1) one end is arranged in mixing chamber (6-4), the other end stretches out mixing chamber (6-4) and is connected with decompressor (5) afterwards, Secondary Flow inlet channel (6-2) is fixed on the outer wall of mixing chamber (6-4), and Secondary Flow inlet channel (6-2) is communicated with mixing chamber (6-4) inside, Secondary Flow inlet channel (6-2) is connected with secondary blast unit (9).
4. a kind of central air conditioning Fresh air handling units structure according to claim 3, is characterized in that, described secondary blast unit (9) is air blast, and air blast is communicated with Secondary Flow inlet channel (6-2); Air blast is the one in axial flow blower or centrifugal fan, and air blast adopts stepless speed regulation structure, the controller of air blast is provided with RS485 communication interface.
5. a kind of central air conditioning Fresh air handling units structure according to claim 2, is characterized in that, described evaporimeter (3) is the one in ammonia evaporator or evaporator with heat pump, and the controller of evaporimeter (3) is provided with RS485 communication interface.
6. a kind of central air conditioning Fresh air handling units structure according to claim 1, is characterized in that, described decompressor (5) is the one of adjustable one-stage centrifugal turbine, centripetal radial turbine, axial flow turbine decompressor or the screw expander of guide ring; The controller of described decompressor (5) is provided with RS485 communication interface.
7. a kind of central air conditioning Fresh air handling units structure according to claim 2, is characterized in that, described generating set (10) is the one in Synchronous generator or asynchronous generating unit, and the controller of generating set (10) is provided with RS485 communication interface.
8. a kind of central air conditioning Fresh air handling units structure according to claim 2, is characterized in that, described drier (4) is moisture trap, the one of absorption type dryer or absorption drier; The one that described compressor (2) is water-cooled or air cooling centrifugal-flow compressor, axial-flow compressor or spiral lobe compressor, the drive motors of compressor (2) adopts stepless speed regulation mode, and the controller of compressor (2) is provided with RS485 communication interface.
9. a kind of central air conditioning Fresh air handling units structure according to claim 2, it is characterized in that, described heater (7) for electric heater or electric heater and heat pump condenser combine in one, the controller of heater (7) is provided with RS485 communication interface, heater (7) input power stepless speed regulation; Described heater (7) is connected with blast pipe (8) away from one end of blender (6); Described compressor (2) is connected with air inlet pipe (1) away from one end of evaporimeter (3).
10. a method of work for central air conditioning Fresh air handling units, is characterized in that, comprises the following steps:
A () employing exit flow pressure is 3-6 atmospheric pressure, exit flow temperature is, after compressor (2) compressed air of 35 DEG C-45 DEG C, air is inputted evaporimeter (3), form primary air, primary air cools in evaporimeter (3), and the temperature that air discharged by compressor (2) is reduced to 5-20 degree Celsius by evaporimeter (3);
B the low temperature primary air exported in evaporimeter (3) in step (a) is carried out drying by drier (4) by (), drier (4) is for removing the drop in low temperature primary air, reduce the water capacity of low temperature primary air, and therefore reduce the damage of drop icing equipment caused in decompressor (5) expansion process;
C () low temperature primary air after drier (4) enters decompressor (5) and carries out expansion and again lower the temperature, the gas outlet air themperature of decompressor (5) reaches subzero 50-70 degrees Celsius, the Secondary Flow air that the primary air expanded after lowering the temperature and secondary blast unit (9) pass into blender (6) mixes in blender (6), through the water capacity of the unit volume of mixed gas and gaseous mixture temperature all than Secondary Flow air humidity content and temperature low, the flow-rate ratio of adjustment main flow and Secondary Flow adjusts the water capacity of air Mixture, the blower speed adjusted in compressor (2) and secondary blast unit (9) realizes the change controlling main flow and Secondary Flow flow,
D the boundary condition of () water capacity adjustment is: the new air temperature that (1) blender (6) gas outlet gas flow temperature must need lower than target user system; (2) minimum pressure that must not require lower than target user system after blender (6) gas outlet stream pressure counts heater (7) pressure loss, the air that blender (6) is discharged is heated to the temperature range of target user system requirement in heater (7).
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| CN106322531A (en) * | 2016-09-06 | 2017-01-11 | 华中科技大学 | Total-outdoor-heat-exchange air conditioning device with fresh air |
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| CN112432349A (en) * | 2020-11-13 | 2021-03-02 | 广东美的白色家电技术创新中心有限公司 | Air supply mechanism and air conditioner |
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