CN109635230A - A kind of calculation method of single channel multi partition air quantity variable air conditioner fresh air volume - Google Patents
A kind of calculation method of single channel multi partition air quantity variable air conditioner fresh air volume Download PDFInfo
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- CN109635230A CN109635230A CN201811498245.6A CN201811498245A CN109635230A CN 109635230 A CN109635230 A CN 109635230A CN 201811498245 A CN201811498245 A CN 201811498245A CN 109635230 A CN109635230 A CN 109635230A
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Abstract
The present invention relates to a kind of calculation methods of single channel multi partition air conditioning system with variable fresh air volume.This system fresh air volume calculates thinking: (1) determining the amount of fresh air per person and unit area fresh air volume of each subregion；The fresh air demand of calculation system；(2) according to the concepts such as respiratory region and regional air distribution efficiency, zoning fresh air volume；(3) according to concepts such as zonal ventilation efficiency, critical ventilation subregion and system ventilation efficiency, multi-partitioned systems fresh air volume is calculated.There are two types of the ways for calculating fresh air volume all the time: one is using highest new wind ratio in each subregion as system new wind ratio, keeping the fresh air volume of ventilation subregion bigger than normal, increases fresh air energy consumption.Another method is that the fresh air demand of each subregion is stacked up as the fresh air volume of system, causes some subregion fresh air volume supplies with high new wind ratio demand represented with critical zone bit insufficient.The present invention had not only guaranteed critical subregion fresh air supply, but also kept multi partition fresh air volume minimum, met the target that Design of VAV System is pursued always.
Description
Technical field
The present invention relates to a kind of calculation methods of single channel multi partition air quantity variable air conditioner fresh air volume, belong to air quantity variable air conditioner neck
Domain.Especially suitable for regions such as office buildings.
Background technique
In air conditioning system with variable, always there is subregion fresh air volume and air outputs for multi partition air conditioning system with variable
Contradiction.
The most common way of decision systems fresh air volume is that simply the fresh air demand of each subregion is stacked up as system
Fresh air volume, new wind ratio is averaged to each ventilation zoned air with system.This method will lead to using critical subregion as some of representative
Subregion fresh air volume with high new wind ratio demand supplies insufficient.
Still an alternative is that moving towards another extreme, it is using highest new wind ratio in each subregion as system new wind ratio.The party
Method only considers the primary utilization of fresh air, does not consider the recycling of fresh air.Very high system new wind ratio makes most of ventilations point
The fresh air volume deviation in area, increases fresh air energy consumption, and energy waste is very big.How to guarantee critical subregion fresh air supply, and makes more points
Sound zone system fresh air volume is minimum, is always the target that Design of VAV System is pursued.
Summary of the invention
The invention mainly includes the fresh air volumes for how being computed correctly single channel multi partition air quantity variable air conditioner.
The calculating thinking of the fresh air volume is as follows:
(1) the amount of fresh air per person and unit area fresh air volume of each subregion are determined；Calculate area and number or the average people of each subregion
Number；Accurately calculate the fresh air demand of each ventilation subregion.Determine the irregular system of personnel；The fresh air demand of calculation system；
(2) according to the concepts such as respiratory region and regional air distribution efficiency, the difference of distinguishable region fresh air volume and respiratory region fresh air volume,
Accurate zoning fresh air volume；
(3) according to concepts such as zonal ventilation efficiency, critical ventilation subregion and system ventilation efficiency, accurate calculating multi-partitioned systems are new
Air quantity.
The calculating concept of system fresh air volume:
(1) ventilation subregion send fresh air new wind ratio Zd
Required new wind ratio is Zd=Voz/Vdz in ventilation zoned air.Voz is region fresh air volume.Vdz be in subregion it is expected most
Small air output.
(2) system is averaged new wind ratio Xs
System is averaged new wind ratio Xs=Vou/Vps.Vps be system First air air quantity, it is determined by following two method: one by
System loading determines；Second, by each ventilation subregion First air most strong wind superposition value ∑Each areaVpz is true multiplied by the irregular system of system loading
Determine, i.e. Vps=LDF × ∑Each areaVpz。
(3) zonal ventilation efficiency Evz
Zonal ventilation efficiency Evz=1+Xs-Zd.From formula as can be seen that region new wind ratio Zd is bigger, zonal ventilation efficiency is got over
Low, maximum is newly compared in critical zoned air, and zonal ventilation efficiency is minimum.
(4) system ventilation efficiency Ev
The drafting efficiency of multi-partitioned systems takes the minimum value Ev=min (Evz) of each drafting efficiency.For critical subregion, system
Drafting efficiency is then Ev=1+Xs-Zd(critical).It follows that critical zoned air new wind ratio Zd(critical)It is average closer to system
New wind ratio Xs, the drafting efficiency of critical subregion is higher, it is also closer with the drafting efficiency of each ventilation subregion, subregion of respectively divulging information
The fresh air volume of " being not run out " is also smaller, thus, the fresh air for excluding outdoor is fewer, and system ventilation efficiency is higher.
(4) formula and definition
Voz=Vbz/Ez (1)
Vbz=Rp × Pz+Ra × Az (2)
D=Ps/ ∑Each areaVpz (3)
Vot=Vou/Ev (the multi partition circulatory system) (4)
Vou=D × ∑Each area(Rp×Pz)+∑Each area(Ra×Az) (5)
Zd=Voz/Vdz (6)
Xs=Vou/Vps (7)
Vps=LDF × ∑Each areaVpz (8)
Evz=1+Xs-Zd (9)
Ev=min (Evz) (10)
Ev=1+Xs-Zd(critical) (11)
Vbz in formula --- respiratory region fresh air volume.Enter the fresh air volume of respiratory region in ventilation subregion；
Ez --- regional air distribution efficiency；
Rp --- the amount of fresh air per person.There is the average value of statistics to obtain demand fresh air volume per capita；
Pz --- region number, the expected maximum number of such persons occurred in subregion of divulging information；
Ra --- unit area fresh air volume counts the unit area demand fresh air volume of each occasion；
Az --- the net usable floor area in region；
D --- the irregular coefficient of personnel；
Ps --- system number.The maximum number of such persons of each subregion while appearance that air-conditioning system is serviced；
Vot --- system fresh air volume.System fresh air volume after the irregular coefficient of personnel and system ventilation Efficiency correction, m3/ h:
Zd --- region air-supply new wind ratio.The ratio of region air output and required fresh air；
Voz --- region fresh air volume.Fresh air volume designed by air conditioning area, m3/h；
Vdz --- region air output.It is expected that air conditioning area air output, it includes First air and return air on the spot, m3/h；
Xs --- system is averaged new wind ratio.New wind ratio i.e. in the First air of air-conditioning submitting；
Vou --- the system fresh air demand without system ventilation Efficiency correction, m3/h；
Vps --- system primary air flow.Contain the total air output in each region of fresh air system, m from air conditioner3/h；
LDF --- the irregular coefficient of system loading；
Vpz --- region primary air flow.Contain the air output of region one time of fresh air from air conditioner, it includes new in air conditioner
Wind and return air, but do not include the air quantity for permeating wind and being recycled to air conditioning area with other methods, m3/ h:
Evz --- zonal ventilation efficiency；
Ev --- system ventilation efficiency.
Detailed description of the invention
Fig. 1 is certain office floor plan.
Specific embodiment
Below with certain floor plan of handling official business, design is using single air duct reheating type air conditioning system with variable.The plane has east
To, west to each three outskirt offices of south orientation；Two south orientation, north orientation meeting rooms, 2 three south orientation, north orientation 1, north orientation inner regions are done
Public room.The air-conditioning plane divides eight ventilation subregions into altogether.Wherein east orientation, west to, 2 four south orientation, north orientation office chamber ventilated subregions
Three temperature-controlled areas are respectively carefully marked again.
1. region fresh air volume calculates
Step 1: calculating each region number Pz and usable floor area Az.The respiratory region minimum fresh air requirmente Rp that is rule of thumb counted and
Unit area fresh air volume Ra calculates respiratory region fresh air volume according to formula (2).
Step 2: according to the air distribution form of system, each ventilation subregion for being looked into according to query statistic table in cooling supply and
Area distribution efficiency Ez under supplying thermal condition.
Step 3: Vbz is respiratory region fresh air volume according to formula (1), region fresh air volume under cooling supply and supplying thermal condition is calculated
Voz。
According to 2 zoning fresh air volume of table.
2. system fresh air volume is calculated according to each ventilation subregion sensible heat load and system supply air temperature difference, each ventilation subregion can be acquired
End equipment First air maximum air supply rate Vpz.Referring to the parameter in end equipment sample, determine that end equipment First air minimum is sent
Air quantity Vpz-min.As being equipped with multiple end equipments in a ventilation subregion, then the primary air flow for subregion of divulging information is the ventilation
The summation of all end equipment primary air flows in subregion, referring to 3 computing system fresh air volume of table.
Step 4: calculating the new wind ratio of region one time under cooling supply and supplying thermal condition according to (6).Zp air conditioning area First air it is new
Wind ratio is sent to the ratio of fresh air in the First air of ventilation subregion.
Step 5: according to a new wind ratio max (Zp) maximum in each ventilation subregion, value is looked into table 1, and to acquire system logical
Wind efficiency recommendation Ev.
Step 6: determining the expected maximum number Ps of system, and press formula (3) calculation system personnel according to engineering practice
Irregular coefficient.
D=Ps/ ∑Each areaPz=346/446=0.78 (contemplated system maximum number Ps=346 people)；
Step 7: calculating the fresh air demand Vou without system ventilation Efficiency correction by formula (5).
Vou=D × ∑Each area(Rp×Pz)+∑Each area(Ra × Az)=0.78 × 3791+3630=6587；
Step 8: by formula (4) calculation system fresh air volume Vot；
Vot=Vou/Ev=6587/0.66=9980；
1 system ventilation efficiency recommendation of table
2 region fresh air volume computational chart of table
3 system fresh air volume of table calculates
Claims (5)
1. for overcome the deficiencies in the prior art, the present invention provides a kind of single channel multi partition air conditioning system with variable fresh air volumes
Algorithm, it is characterised in that determine the amount of fresh air per person and unit area fresh air volume of each subregion；Calculate area and the people of each subregion
Several or average number；The fresh air demand for accurately calculating each ventilation subregion, determines the irregular coefficient of personnel；The fresh air of calculation system needs
The amount of asking.
2. zoning fresh air volume, which is characterized in that according to the concepts such as respiratory region and regional air distribution efficiency, distinguishable region is new
The difference of air quantity and respiratory region fresh air volume, accurate zoning fresh air volume.
3. calculating multi-partitioned systems fresh air volume, it is characterised in that according to zonal ventilation efficiency, critical ventilation subregion and system ventilation
The concepts such as efficiency, it is accurate to calculate multi-partitioned systems fresh air volume.
4. the calculating of the fresh air volume includes the following steps: according to claims 1,2,3
(1) ventilation subregion send fresh air new wind ratio Zd
Required new wind ratio is Zd=Voz/Vdz in ventilation zoned air, and Voz is region fresh air volume, and Vdz is expected in subregion
Minimum supply air rate；
(2) system is averaged new wind ratio Xs
System is averaged new wind ratio Xs=Vou/Vps, and Vps is system First air air quantity, it is determined by following two method: its
One, it is determined by system loading；Second, by each ventilation subregion First air most strong wind superposition valueMultiplied by the irregular system of system loading
System determination, i.e. Vps=LDF；
(3) zonal ventilation efficiency Evz
Zonal ventilation efficiency Evz=1+Xs-Zd, from formula as can be seen that region new wind ratio Zd is bigger, zonal ventilation efficiency is got over
Low, maximum is newly compared in critical zoned air, and zonal ventilation efficiency is minimum；
(4) system ventilation efficiency Ev
The drafting efficiency of multi-partitioned systems takes minimum value Ev=min (Evz) of each drafting efficiency, for critical subregion, system
Drafting efficiency is then Ev=1+Xs-, it follows that critical zoned air new wind ratioCloser to system
Average new wind ratio Xs, the drafting efficiency of critical subregion is higher, it is also closer with the drafting efficiency of each ventilation subregion, each to divulge information
The fresh air volume of subregion " being not run out " is also smaller, thus, the fresh air for excluding outdoor is fewer, and system ventilation efficiency is higher.
5.(5) formula and definition
Zd=Voz / Vdz
Xs=Vou / Vps
Vps = LDF
Evz = 1+Xs–Zd
Ev = min(Evz)
Ev = 1+Xs–
Zd in formula --- region air-supply new wind ratio, the ratio of region air output and required fresh air；
Voz --- region fresh air volume, fresh air volume designed by air conditioning area,/h；
Vdz --- region air output, it is contemplated that air conditioning area air output, it includes First air and return air on the spot,/h；
Xs --- system is averaged new wind ratio, i.e. new wind ratio in the First air sent out of air-conditioning；
Vou --- the system fresh air demand without system ventilation Efficiency correction,/h；
Vps --- system primary air flow contains the total air output in each region of fresh air system from air conditioner,/h；
LDF --- the irregular coefficient of system loading；
--- region primary air flow contains the air output of region one time of fresh air from air conditioner, it includes new in air conditioner
Wind and return air, but do not include the air quantity for permeating wind and being recycled to air conditioning area with other methods,/h；
Evz --- zonal ventilation efficiency；
Ev --- system ventilation efficiency.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113779503A (en) * | 2021-08-20 | 2021-12-10 | 中国第一汽车股份有限公司 | Method, system, terminal and storage medium for evaluating control performance of multi-temperature-zone of air conditioner of passenger compartment of automobile |
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| CN102393058A (en) * | 2011-10-24 | 2012-03-28 | 湖南百时得能源环保科技有限公司 | End control system for air conditioning systems |
| CN106839322A (en) * | 2017-02-23 | 2017-06-13 | 林兴斌 | The real-time ventilation air calculation procedure of multizone and its implementation |
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2018
- 2018-12-07 CN CN201811498245.6A patent/CN109635230A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393058A (en) * | 2011-10-24 | 2012-03-28 | 湖南百时得能源环保科技有限公司 | End control system for air conditioning systems |
| CN106839322A (en) * | 2017-02-23 | 2017-06-13 | 林兴斌 | The real-time ventilation air calculation procedure of multizone and its implementation |
Non-Patent Citations (1)
| Title |
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| ASHRAE STANDARD: "Ashrae Standard: Ventilation for Acceptable Indoor Air Quality", 《ANSI/ASHRAE STANDARD》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113779503A (en) * | 2021-08-20 | 2021-12-10 | 中国第一汽车股份有限公司 | Method, system, terminal and storage medium for evaluating control performance of multi-temperature-zone of air conditioner of passenger compartment of automobile |
| CN113779503B (en) * | 2021-08-20 | 2024-03-15 | 中国第一汽车股份有限公司 | Method, system, terminal and storage medium for evaluating multi-temperature-zone control performance of air conditioner in passenger compartment of automobile |
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Application publication date: 20190416 |