CN1632397A - Air quantity variation air-conditioning system for terminal device with no air quantity variation - Google Patents
Air quantity variation air-conditioning system for terminal device with no air quantity variation Download PDFInfo
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- CN1632397A CN1632397A CN 200410073251 CN200410073251A CN1632397A CN 1632397 A CN1632397 A CN 1632397A CN 200410073251 CN200410073251 CN 200410073251 CN 200410073251 A CN200410073251 A CN 200410073251A CN 1632397 A CN1632397 A CN 1632397A
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Abstract
The present invention discloses an air quantity variation air-conditioning system for terminal device with no air quantity variation comprising a total load variation information extracting system of air-conditioning system composed of a temperature transducer on a air supply head pipe, an air quantity transducer, and a temperature transducer on a air returning head pipe; a total air resistance variation information extracting system of air-conditioning system composed of a pressure difference transducer on a blower inlet and outlet, and an air quantity transducer on a air supply head pipe; a branch static water force balance adjusting system composed of a manual adjustment valve on each air supply branch and air supply port; a system load tracking control system composed of a temperature transducer on a air returning pipe, a blower, and transducer; a water branch static force balance adjusting system of energy-saving air-conditioning system with no electrical bi-pass adjusting valve composed of manual water quantity bi-pass adjusting valve and air processor pipe coil. The invention uses 'system thinking' principal to get rid of air quantity terminal device to obtain VAV system characters of simple structure, low cost and energy saving.
Description
Technical field
The present invention relates to the centralized air-conditioning air conditioning system with variable, be specially adapted to a kind of variable air rate energy-saving air conditioning system that does not have air quantity variable end device.
Background technology
Existing centralized air-conditioning air conditioning system with variable is to have air quantity variable end device (VAVBOX)---the air-conditioning system of variable air rate case, and it is compared with the air-conditioning system of routine, is energy-conservation energy-saving air conditioning system more than 10%.It is particularly suitable for high-grade intelligent office block, building inner region, room temperature needs to regulate individually and adaptation has the extraordinary occasion that requires as the SARS ward.But air quantity variable end device (VAVBOX) price height, control system complexity, system's initial cost height, (see document: Ma Junliang. the civil buildings Air-conditioner design. Chemical Industry Press, 2003-7 and Wang Jiajuan. variable air volume system control is brief talked. national HVAC refrigeration academic annual meeting data summary collection p136 in 2004) limited the VAV air-conditioning system in China, application in common central air-conditioning system.Figure 1 shows that traditional air conditioning system with variable that air quantity variable end device is arranged (being called for short VAV later on) flow chart.This air-conditioning system comprises three control loops:
1, vav terminal VAVBOX control loop, it finishes 4 tasks: room temperature control, to the aperture of building control System Reports variable air rate control valve and air quantity and and the combined network communication of building control system;
2, wind pushing temperature control system: form by the temperature sensor T on air conditioner AHU, the ajutage and the electronic two-way regulating valve on the cold water pipe and the control software hugged in the control system;
3. ajutage static pressure control system: by ajutage is static pressure transducer P, blower fan F
1, frequency converter IV and the control software hugged in the control system forms.
In traditional VAV air-conditioning system is to follow the tracks of room load with the adjusting of " amount " to change.Its control is in two sub-sections: the one, and the aperture according to the bias adjustment air quantity variable end device VAVBOX of room temperature and design temperature adapts air output and payload, and terminal variable air rate regulating system is complete closed loop thermal control system; The 2nd, air processing machine AHU control system, it has two control loops: a control loop is the control loop of air-supply static pressure P, when some VAVBOX ends change when making that the static pressure P of characteristic point departs from setting value on the ajutage, according to the size of static pressure deviation, by frequency converter IV control blower fan F
1Rotating speed, total air output and total load size are adapted, static pressure P is got back near the setting value again.Another control loop is wind pushing temperature T (in an air processing machine AHU exit) control loop, when load changes, cause that wind pushing temperature T departs from set-point, size according to deviation, regulate the aperture of the moving two-way valve M of cold (heat) water power, change cold (heat) water yield that enters air processing machine AHU, wind pushing temperature is got back to again near the setting value, guarantee that " matter " (being wind pushing temperature T) of air-supply is constant.Keeping the constant purpose of blast pressure P in control is to the interference in other rooms when regulating for the air quantity variable end device that reduces a room.Can prove that in theory energy-conservation of level pressure variable air rate frequency conversion fan and the first power of air output are directly proportional, therefore energy-conservation effect is limited.
In order to improve energy-saving effect,, develop " minimum static pressure " control method that a kind of AHU along with the progress of electron controls technology and network technology.(referring to document: Chen Xiangyang. the automatic control of air conditioning system with variable. HVAC, 97.3) in " minimum static pressure " method control system, VAVBOX becomes expensive intelligent terminal (now, 6500 yuan of external intelligent VAVBOX complete sets of products price average out to, home products does not reach the performance (HVAC web material) of external product), it is except regulating the air output according to indoor load, also has very strong network savvy, constantly to the flow of the report VAVBOX of building, building control system (BAS) and the aperture of air-valve, the calculated signals that BAS sends here according to each VAVBOX judges whether the major part of air-conditioning system stroke valve reaches the stage of standard-sized sheet in the definition, if do not have, the blast P that will blow of BAS heuristic reduces a bit again, all reach the stage of standard-sized sheet in the definition up to most air-valve, system has also just reached " minimum static pressure ".Because most air-valve all reaches standard-sized sheet degree in the definition in " minimum static pressure " method, restriction loss is few, and is therefore more energy-conservation than traditional constant static-pressure, unsteady flow amount VAV air-conditioning system.But on the structure of system concerning building control system, each VAVBOX has the microprocessor of two analog inputs (AI) point and self band at least, need be about 2000 yuan of RMB, the flow sensor of each VAVBOX and valve area sensor need about 3000 yuan of RMB at least, RS232 or RS485 interface and drive software thereof that network savvy is arranged, need again about 500 yuan, well imagine, if the VAV system is very big, its sub-VAV system is very many, VAVBOX will be very many also, just not saying BAS system complex, the cost of whole VAV air-conditioning system will not be the general users can bear, moreover since the governing equation group of blast main air-supply static pressure control system do not seal, determined that control procedure is exploratory, made the program structure of control software be tending towards complicated.Anatomize the reason that causes this state, be that traditional VAV air-conditioning system is by professional module, constitutes by the function of the element one by one theory with " unilateral thinking ", the system integration has seam, causes the so unnatural, harmonious, orderly, balanced of VAV air-conditioning system overall operation.
In view of economical, technical reason, above-mentioned traditional VAV air-conditioning system that VAVBOX is arranged is applied and is very restricted.
Summary of the invention
The purpose of this invention is to provide the relative advantages of simple of a kind of structure, easy and simple to handle, cost is with low cost, energy savings, and function admirable is simplified a kind of air conditioning system with variable that does not have air quantity variable end device of controlling.Realize that the goal of the invention technical scheme is to solve like this: comprise total load extracting change information system, total windage extracting change information system, static hydraulic balancing regulating system, load follow control system, system water branch road static hydraulic balancing regulating system, improvements of the present invention are also to comprise the air-conditioning system total load extracting change information system that is made up of the temperature transmitter on the temperature transmitter on the header pipe in the air-conditioning system, air quantity transmitter and the return air house steward; The total windage extracting change information of the air-conditioning system system that pressure fan is imported and exported or the air quantity transmitter on pressure difference transmitter and header pipe between the total ajutage of system, backwind tube is formed; The branch road static hydraulic balancing regulating system that manual modulation valve on each bar air-supply branch road and air outlet are formed; The system loading following control system that temperature transmitter on the backwind tube, blower fan and frequency converter are formed; The no electronic two-way regulating valve energy-saving air conditioning system water branch road static hydraulic balancing regulating system that manual water yield two-way control valve and air-treatment coiler are formed.
The present invention compared with prior art, it is theory with " System Thinking ", related between the function of whole overall each subsystem of design construction of variable air rate (VAV) air-conditioning system of no air quantity variable end device (VAVBOX) and subsystem, thereby make structure, more reasonable, the nature of operation, the coordination of the VAV entire system of invention, emerge the new characteristic that traditional VAV air-conditioning system can't be reached: cheap cost, obvious energy-saving effect and do not have the brief VAV system architecture of air quantity variable end device (VAVBOX).This VAV air-conditioning system formation scheme hews out a new path for popularizing variable air rate function admirable, obvious energy conservation (VAV) air-conditioning system.Two indexs of the initial investment of the technical program and energy consumption compared with prior art, significant, substantial progress and characteristics are all arranged, if be widely used in the transformation of existing air-conditioning system and the design of newly-built air-conditioning system, will have good economic benefits, social benefit and environmental benefit.
Description of drawings
Fig. 1 is the VAV air-conditioning system structural representation that the VAV control valve is arranged;
Fig. 2 is the VAV air-conditioning system structural representation of no VAV control valve;
Fig. 3 is an airduct specific frictional resistance calculating chart in the current Air-conditioner design.
The specific embodiment
Accompanying drawing 2 is a specific embodiment of the present invention.
Be described further below in conjunction with the technical scheme content of accompanying drawing this:
With reference to shown in Figure 2, a kind of air conditioning system with variable device that does not have air quantity variable end device, comprise total load extracting change information system, total windage extracting change information system, static hydraulic balancing regulating system, load follow control system, system water branch road static hydraulic balancing regulating system, also comprise the air-conditioning system total load extracting change information system that temperature transmitter T, air quantity transmitter F on the header pipe in the VAV air-conditioning system and the temperature transmitter T on the return air house steward form; Pressure fan F
1The total windage extracting change information of the VAV air-conditioning system system that import and export or the air quantity transmitter F on pressure difference transmitter Δ P and header pipe between the total air blow and return of system form; The branch road static hydraulic balancing regulating system that manual modulation valve AV on each bar air-supply branch road and air outlet AO form; Temperature transmitter T on the backwind tube, blower fan F
1System loading following control system with frequency converter IV composition; The no electronic two-way regulating valve energy-saving air conditioning system water branch road static hydraulic balancing regulating system that manual water yield two-way control valve WV and air-treatment coiler AHU form.On air processing machine AHU outlet main leg, total blast volume air volume meter (F) is installed and series connection manual air balance control valve (AV) in each bar bypass duct.
In the VAV design of air conditioning, be that air conditioner load characteristic and the approximate zone of air-conditioning requirement are divided into a conditioned area, so the present invention suppose that the load variations in each terminal room of sub-VAV air-conditioning system is synchronous.In the comfort air conditioning system system, the people's is insensitive, and the load adjusted in concert can satisfy the requirement of most people's comfortableness.
The present invention is the theory with " System Thinking ", related between the function of whole overall each subsystem of design construction of variable air rate (VAV) air-conditioning system of no air quantity variable end device (VAVBOX) and subsystem, thereby make structure, more reasonable, the nature of operation, the coordination of entire system, emerge the new characteristic that traditional VAV air-conditioning system can't be reached.With common low-cost air port, manual air balance control valve AV, replace air quantity variable end device (VAVBOX) expensive in the traditional VAV system, each terminal air measuring sensor F of cancellation, the function that sensor left by air-valve, replace with a total blast volume air volume meter F who is put on total ajutage, with the pressure transmitter P on the pressure difference transmitter Δ P replacement header pipe characteristic point of pressure fan import and export, so just constituted variable air rate (VAV) air-conditioning system of no air quantity variable end device (VAVBOX).
This patent invention is that following two inferences of having used my proposition are extended invention.
The inventor herein is formerly in 200410073119.8 apply for a patent, and is with the theory of " System Thinking ", verified theoretically and proposed at region of quadratic resistance law the overall drag coefficient S of any resistance element (the overall drag coefficient S of pipeline in the water circuit system
iOr local resistance component synthesis resistance coefficient S
j) only relevant with its geometric parameter, and and the new theory that has nothing to do by its flow size.
The inventor herein formerly in 200410073119.8 apply for a patent, has proved theoretically that water circuit system at the sufficient and necessary condition of the most energy-conservation complete similar operating condition operation is, at (Δ P
t-H
0)---L (Δ P
t---water pump pressure head, Pa; H
0---water loops system hydrostatic head, Pa; L---pump capacity, m
3/ s) total overall drag coefficient S in the coordinate system
tIn running, keep invariable.
According to fluid mechanics principle, during the Mach number M=0.3 of air-flow, gas is used as incompressible fluid and is handled, and the error of bringing only has 4.46%, can satisfy the requirement of engineering calculation precision fully.The air velocity maximum that runs in the HVAC is 15m/s only, Mach number has only M=0.044, being used as incompressible fluid handles, the error of calculation of bringing has only 0.1%, handle so the air in the air-conditioning system can be used as incompressible fluid fully, can not bring the unallowed error of calculation on the engineering.Therefore basis " System Thinking " theory is at incompressible fluid---and prove above-mentioned two inferences that obtain in the system of water, also be applicable to the designing and calculating of central air-conditioning wind path fully.Be for air path system, the differential static pressure H of wind circuit system
0Can ignore, and as enclosed vane road system.In addition, the airduct cross sectional shape seldom is circular, at this moment will be the same with traditional computational methods, notion with equivalent diameter, and, carry out airduct resistance, fan pressure head, flow, design conditions point fan performance, variable working condition point performance, select the simple of blower fan prognosis result and accurate calculating etc. with the method that the inventor formerly proposes in 200410073119.8 apply for a patent.According to above-mentioned analysis,, the conclusion of above-mentioned water system can be rephrased as follows for air path system:
At region of quadratic resistance law, the overall drag coefficient S of any resistance element (airduct overall drag coefficient S in the air path system
iOr local airduct resistance element overall drag coefficient S
j) only relevant with its geometric parameter.Figure 3 shows that traditional airduct resistance ratios frictional resistance calculating chart, resistance-rating curve on the figure (logp-logL figure) is straight line entirely, airduct overall drag coefficient and irrelevant by its air quantity size has been described, this conclusion is acquiescence and application so already on current Air-conditioning Engineering, and therefore the engineering calculation of carrying out under this prerequisite is fully reasonably in theory.
Air path system is the overall drag coefficient S that wind system is total at sufficient and necessary condition the most energy-conservation, on all four operating mode operation
tIn running, keep invariable.
These two inferences deep implication behind is that air path system will be in the most energy-conservation full similar operating condition operation, neither one can change the adjusting air-valve of geometric parameter in the wind system, is also included within the air quantity variable end device (VAVBOX) that the variable working condition geometric parameter can change certainly.The theoretical foundation of air quantity variable air conditioner (VAV) system of Here it is the no VAVBOX of invention.
The variation of return air temperature is because environment temperature t in essence
AoVariation causes, the thermal property of it and building structure, building shape coefficient, purposes, enclosed structure be relative (intension that these are exactly Coefficient K, exterior wall area F), so wind system is treated as a unified integral body, gone to handle with the theory of System Thinking, be the reflection of objective reality.
If in total air path system control, follow the tracks of the temperature difference (t of wind system air-supply, return air
A2-t
A1) variation of constant tracking system load, with the frequency shift pressure fan F that regulates fan frequency converter IV
1Rotating speed, promptly change fan pressure head Δ P, because neither one can change the resistance element of geometric parameter in the VAV system, the overall drag coefficient S of blast main, branch wind pipe is all constant in the system, the VAV system just can automatically work on the most energy-conservation complete similar operating condition point, make the proportional synchronous variation of flow in the air port in each room simultaneously, satisfy the requirement of load variations.Blower fan in the complete the most energy-conservation mechanism of similar operating condition is: at complete similar operating condition, and pressure fan F
1Power consumption and the cube of rotating speed be directly proportional, its physical meaning be exactly the aperture of each manual air balance control valve AV of air path system in advance all in rational maximum, wind system restriction loss minimum.
The VAV system of no VAVBOX device will reach this desirable purpose, and the wind path static hydraulic balancing tracking before putting into operation is very important.When the static hydraulic balancing tracking of the VAV of no VAVBOX device system, be the time equal rate of load condensate 58% operating mode, with manual air balance control valve AV separately the air quantity of terminal air port AO adjust to 58% of metered flow, and the air current composition situation in confirmatory measurement room, guarantee that the VAV system can both satisfy air-conditioning requirement (certainly most of running time, also can promptly under 40%～50% metered flow, carry out the adjustment of room air current composition) at the flow of VAV system minimum.System's tracking is from distal-most end, till last air port of near-end.Adjust so repeatedly several times, accurately reach static hydraulic balancing up to whole VAV system.The purpose of doing like this is to seek a rational minimum overall drag coefficient S to each branch wind pipe of air path system, blast main.
Enumerate two example explanation the present invention and prior art air-conditioning system initial stage mounting cost and operating cost below and compare, just can understand advantage of the present invention place.
Example 1
Below calculating is that the blower fan rated capacity is 0.823kW to a typical all-air conditioning system, and air-conditioning average of the whole year rate of load condensate is 58%.Suppose that the annual total run time of air-conditioning system is 2400h, electricity charge unit price is 1.00 yuan/kWh.(this example adopt be the example of going up in the lecture notes of the military 2004-4-9 of Co., Ltd.'s " energy-conserving control technology of VAV/VWV air-conditioning " of seamount in China's refrigeration exhibition).
For traditional full pressurization by compressed air, a constant air volume system, rated disspation is 0.823kW, 1975.2 yuan/y of the annual electricity charge;
For a traditional full air VAV air-conditioning system of air quantity variable end device (VAVBOX) being arranged, is level pressure, variable flow system, and average power consumption is 0.49kW, and 1176 yuan/y of the annual electricity charge is 59.5% of level pressure, a constant air volume system energy consumption;
The air quantity variable end device (VAVBOX) of VAV air-conditioning system do not have to(for) a full air of this patent invention, be transformation, the full similar system of unsteady flow amount, average power consumption is 0.161kW, 385.4 yuan of the annual electricity charge, be level pressure, decide 19.5% of air quantity air-conditioning system power consumption, be 32.8% of level pressure, variable flow system energy consumption, fractional energy savings is 67.3%, the energy-saving effect highly significant.
Example 2
For variable air rate (VAV) air-conditioning system that the general scale of air quantity variable end device (VAVBOX) is arranged, supposing has 300 air quantity variable end devices (VAVBOX), if each VAVBOX burden 40m
2Air-conditioning area (being equivalent to two standard standard widths of a room in an old-style house), estimation air-conditioning area is at 12000m
2, amount to construction area 15000m
2
For the VAV air-conditioning system that air quantity variable end device (VAVBOX) is arranged, 300 import vav terminal VAVBOX need to invest 1,950,000 yuan approximately, supporting floor control system (BAS) network savvy, need to invest 150,000 yuan approximately, the network savvy software of air quantity variable end device and building control system etc., about 2,100,000 yuan of total investment;
For the VAV air-conditioning system of no air quantity variable end device (VAVBOX), each the standard standard width of a room in an old-style house (about 20m
2) have a high-quality air diffuser AO commonly used to add manual air balance control valve AV, about 500 yuan of one cover of market price, whole VAV system air port, air-valve need be invested about 300,000 yuan.The VAV air-conditioning system that air quantity variable end device (VAVBOX) is arranged, about 1,800,000 yuan of the investment of functions such as the AI interface of saving air quantity variable end device and building control system, networking.The VAV air-conditioning system of no air quantity variable end device (VAVBOX) is only in the AI interface of air quantity variable end device, building control system, the initial cost amount aspect the network savvy, is 14.3% of traditional VAV system, the highly significant that the initial investment of VAV system reduces.
Claims (5)
1, a kind of air conditioning system with variable that does not have air quantity variable end device, comprise total load extracting change information system, total windage extracting change information system, static hydraulic balancing regulating system, load follow control system, system water branch road static hydraulic balancing regulating system, it is characterized in that also comprising the air-conditioning system total load extracting change information system that forms by the temperature transmitter (T) on the temperature transmitter (T) on the header pipe in (VAV) air-conditioning system, air quantity transmitter (F) and the return air house steward; Pressure fan (F
1) import and export or the total windage extracting change information of (VAV) air-conditioning system system of the composition of the air quantity transmitter (F) on pressure difference transmitter (Δ P) and header pipe between the total ajutage of system, backwind tube; The branch road static hydraulic balancing regulating system that manual air balance control valve (AV) on each bar air-supply branch road and air outlet (AO) are formed; Temperature transmitter on the backwind tube (T), blower fan (F
1) and the system loading following control system formed of frequency converter (IV); The no electronic two-way regulating valve energy-saving air conditioning system water branch road static hydraulic balancing regulating system that manual water yield two-way control valve (WV) and air-treatment coiler (AHU) are formed.
2, a kind of air conditioning system with variable that does not have air quantity variable end device according to claim 1 is characterized in that whole air conditioning system with variable neither one is used for the air quantity variable end device of Load Regulation.
3, a kind of air conditioning system with variable that does not have air quantity variable end device according to claim 1 is characterized in that extracting the variation that air-conditioning total load change information is also accurately followed the trail of the air-conditioning system total load at total ajutage place and total backwind tube place.
4, a kind of air conditioning system with variable that does not have air quantity variable end device according to claim 1 is characterized in that blower fan (F
1) constantly spontaneously in the most energy-conservation complete similar operating mode operation.
5, a kind of air conditioning system with variable that does not have air quantity variable end device according to claim 1 is characterized in that each terminal air port (AO) is to follow the trail of load variations synchronously in the system.
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|---|---|---|---|
| CNB2004100732519A CN1296660C (en) | 2004-11-10 | 2004-11-10 | Air quantity variation air-conditioning system for terminal device with no air quantity variation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100732519A CN1296660C (en) | 2004-11-10 | 2004-11-10 | Air quantity variation air-conditioning system for terminal device with no air quantity variation |
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| CN1296660C CN1296660C (en) | 2007-01-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975673A (en) * | 2010-09-07 | 2011-02-16 | 区峰 | Central air-conditioning system energy efficiency real-time monitoring system and method |
| CN111023421A (en) * | 2019-12-27 | 2020-04-17 | 宁波奥克斯电气股份有限公司 | Static pressure self-adjustment control method and device and air conditioner |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004308957A (en) * | 2003-04-03 | 2004-11-04 | Yamatake Corp | Method and device for evaluating air-conditioning control state |
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2004
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975673A (en) * | 2010-09-07 | 2011-02-16 | 区峰 | Central air-conditioning system energy efficiency real-time monitoring system and method |
| CN101975673B (en) * | 2010-09-07 | 2012-10-31 | 区峰 | Central air-conditioning system energy efficiency real-time monitoring system and method |
| CN111023421A (en) * | 2019-12-27 | 2020-04-17 | 宁波奥克斯电气股份有限公司 | Static pressure self-adjustment control method and device and air conditioner |
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Assignee: Shenzhen Hongshida Industrial Development Technology Co., Ltd. Assignor: Cao Qi Contract record no.: 2011440020276 Denomination of invention: Air quantity variation air-conditioning system for terminal device with no air quantity variation Granted publication date: 20070124 License type: Exclusive License Open date: 20050629 Record date: 20110705 |
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Effective date of registration: 20110801 Address after: 518000, room two, building 007, Jiuzhou building, No. twelve South Road, Nanshan District, Shenzhen, Guangdong, Patentee after: Shenzhen Hongshida Industrial Development Technology Co., Ltd. Address before: Beilin District Xianning West Road 710075, Shaanxi city of Xi'an province No. 28 Patentee before: Cao Qi |
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