FI128922B - Method and computer program product for selecting ventilation devices - Google Patents

Method and computer program product for selecting ventilation devices Download PDF

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Publication number
FI128922B
FI128922B FI20196051A FI20196051A FI128922B FI 128922 B FI128922 B FI 128922B FI 20196051 A FI20196051 A FI 20196051A FI 20196051 A FI20196051 A FI 20196051A FI 128922 B FI128922 B FI 128922B
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Finland
Prior art keywords
ventilation
noise level
space
devices
ventilation device
Prior art date
Application number
FI20196051A
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Finnish (fi)
Swedish (sv)
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FI20196051A1 (en
Inventor
Esa Huuskonen
Original Assignee
Climecon Oy
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Publication date
Application filed by Climecon Oy filed Critical Climecon Oy
Priority to FI20196051A priority Critical patent/FI128922B/en
Priority to EP20210160.6A priority patent/EP3832223B1/en
Application granted granted Critical
Publication of FI20196051A1 publication Critical patent/FI20196051A1/en
Publication of FI128922B publication Critical patent/FI128922B/en

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Classifications

    • 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
    • F24F13/24—Means for preventing or suppressing noise
    • 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
    • F24F11/0001—Control or safety arrangements for ventilation
    • 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/48—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring prior to normal operation, e.g. pre-heating or pre-cooling
    • 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
    • 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
    • F24F3/044—Systems in which all treatment is given in the central station, i.e. all-air systems
    • F24F3/048—Systems in which all treatment is given in the central station, i.e. all-air systems with temperature control at constant rate of air-flow
    • F24F3/052—Multiple duct systems, e.g. systems in which hot and cold air are supplied by separate circuits from the central station to mixing chambers in the spaces to be conditioned
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F24F7/08—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output systems

Abstract

In a method for selecting ventilation devices to a ventilation system a first subgroup (10) of possible ventilation devices is chosen based on the total supply air need and/or extract air need of the space and an acceptable noise level L(pA1) of the space is selected. The location and air throw pattern for at least one first ventilation device is/are determined, an estimated noise level L(pA,est) produced by a ventilation device in the space is calculated and at least one first ventilation device to the ventilation system is chosen from those ventilation devices of the first subgroup, which produce an acceptable estimated noise level L(pA,est). In the method at least one noise evaluation point inside an air throw pattern of the at least first ventilation device is/are determined and the estimated noise level L(pA,est) produced by a ventilation device is calculated in said noise evaluation point.

Description

Method and computer program product for selecting ventilation devices Technical Field The invention relates to a method for selecting ventilation devices to a ventilation system of a space from a group of ventilation devices, which ventilation devices have an air throw pattern and produce airborne noise during operation of the venti- lation system, in which method a first subgroup of possible ventilation devices is chosen based on the total supply air need and/or extract air need of the space, an acceptable noise level of the space is selected, a location for at least one first ven- tilation device in the space and the air throw pattern of the at least one possible first ventilation device inside the space is/are determined, an estimated noise level pro- duced by a ventilation device of the first subgroup in the space is calculated and at least one first ventilation device to the ventilation system is chosen from those ven- tilation devices of the first subgroup, which produce an estimated noise level lower than the acceptable noise level.
The invention further relates to a computer program product, which is configured to perform the steps of the method according to the invention, when the program is executed in a processor of a computer.
Background Art A typical ventilation system of a space includes a set of supply air valves and diffus- ers and a set of exhaust air valves.
The supply air valves, diffusers and exhaust air valves, commonly referred as ventilation devices, produce airborne sound, when the ventilation system is in operation.
To ensure that the space is suitable for its intended purpose, there are limit values in building regulations for the acceptable noise levels for different kinds of premises.
The airborne noise caused by the venti- o lation devices must therefore be taken into account, when the ventilation systems O 25 are designed.
Acceptable noise levels in buildings are usually expressed as ac- = ceptable frequency weighted noise pressure levels.
N The noise level caused by the ventilation system is different in different locations of E the space.
The airborne noise is highest inside the throw pattern of the ventilation - device.
Naturally, the noise level in a space depends of the amount of ventilation o 30 — devices inside said space.
However, current dimensioning methods of the ventila- > tion systems now take the orientation of the flow patterns of the devices and the N combined effect of a group of ventilation devices into account, when the noise level inside a space is evaluated.
The selection of ventilation devices to the ventilation systems is thus often based on inaccurate evaluation of the noise level, which may lead to improperly operating ventilation systems.
An object of the invention is to provide a method and computer program product for selecting ventilation devices to a ventilation system of a space, by means of which method and computer program product the drawbacks related to the prior art can be reduced.
The object of the invention is achieved with a method and computer program prod- uct which are characterized in what is disclosed in the independent patent claims.
Some preferred embodiments of the invention are disclosed in the dependent claims.
Brief summary of the invention The invention relates to a method for selecting ventilation devices to a ventilation system of a space from a group of ventilation devices, which have an air throw pat- tern and produce airborne noise during operation of the ventilation system.
In the method a first subgroup of possible ventilation devices is chosen based on the total supply air need and/or extract air need of the space, an acceptable noise level L pai of the space is selected, a location for at least one first ventilation device in the space and the air throw pattern of the at least one possible first ventilation device inside the space is/are determined, an estimated noise level Lpaest produced by a ventilation device of the first subgroup in the space is calculated and at least one first ventilation device to the ventilation system is chosen from those ventilation de- vices of the first subgroup, which produce an estimated noise level L pa est lower than the acceptable noise level L pai.
Further, in the method according to the invention at o least one noise evaluation point inside an air throw pattern of the at least first venti- O 25 lation device is/are determined and the estimated noise level L paest produced by a — ventilation device of the first subgroup is calculated in said noise evaluation point.
N Thus, in the invention the evaluation point of the noise level is inside the throw pat- - tern of the ventilation device, i.e. in a place where the airborne noise caused by the = ventilation device is highest. o 30 In a first preferred embodiment of the method according to the invention a location > for a set of first ventilation devices in the space and the air throw patterns of the set N of the first ventilation devices inside the space are determined, a noise evaluation point inside an air throw pattern of at least one first ventilation device of the set is determined, an estimated noise level Lpaest produced by said set of ventilation devices is calculated in said noise evaluation point and the set of first ventilation devices to the ventilation system is chosen from those ventilation devices of the first subgroup, which produce an estimated noise level Lpa esu lower than the acceptable noise level L pai.
Thus, in this embodiment the estimated noise level Lpaest produced by a group of ventilation devices is calculated and the ventilation devices to the ventilation system are chosen based on the noise level Lpa est produced by a group of ventilation devices.
Preferably, a ventilation device or a set of ventilation devices producing the lowest estimated noise level Lpaest in at least one noise evaluation point is chosen to a first ventilation device or to the set of first ventilation devices of the ventilation system.
In a second preferred embodiment of the method according to the invention a loca- tion for at least one second ventilation device or a set of second ventilation devices inside the space is determined, an estimated noise level Lpaca in at least one noise evaluation point of the space is calculated and at least one second ventilation device or a set of second ventilation devices to the ventilation system is chosen from those ventilation devices of the first subgroup, which produce an estimated noise level L pa est lower than the acceptable noise level Lpa1. Preferably, a ventilation device or a set of ventilation devices producing the lowest estimated noise level Lpa est in at least one noise evaluation point is chosen to a second ventilation device or to the set of second ventilation devices of the ventilation system.
In yet another preferred embodiment of the method according to the invention, when calculating the noise level Lpaest Of the space, the influence of obstacles inside space to the noise level Lpaest is evaluated and the noise level Lpaest value is ad- justed accordingly.
The obstacles inside a space have an influence to the air throw pattern of the ventilation devices and thereby they also have influence to the air- N borne sound of the ventilation devices.
The obstacle may be a wall-type obstacle N and the height of the obstacle may be smaller than height of the wall of the space. = The obstacle may be situated on the floor of the space or on the veiling of the space. 2 In yet another preferred embodiment of the method according to the invention, when = 30 calculating the noise level Lpaest Of the space, the influence of surface materials of io the obstacle to the noise level Lpa est is evaluated and the noise level Lpaest value is 3 adjusted accordingly.
The surface material of the obstacle absorb sound energy and > thereby the sound absorption coefficient of the surface material affects to the noise level inside the space.
In yet another preferred embodiment of the method according to the invention a preset adjustment is made to the selected first and/or second ventilation devices and the ventilation device is furnished with a tag identifying the space and location of the ventilation device inside the space. In yet another preferred embodiment of the method according to the invention the first ventilation device is a supply air valve or diffuser. In yet another preferred embodiment of the method according to the invention the second ventilation device is an exhaust air valve. The invention also relates to computer program product for selecting ventilation de- vices to a ventilation system of a space from a group of ventilation devices, which ventilation devices have an air throw pattern and produce airborne noise during op- eration of the ventilation system. Said computer product comprises code means configured to produce a first subgroup of possible ventilation devices based on the total supply air need and/or extract air need of the space, code means configured — to select an acceptable noise level Lpai of the space, code means configured to determine a location for at least one first ventilation device in the space and an air throw pattern of the at least one possible first ventilation device inside the space, code means configured to calculate an estimated noise level produced by a ventila- tion device of the first subgroup in the space and code means configured to choose at least one first ventilation device to the ventilation system from those ventilation devices of the first subgroup, which produce an estimated noise level lower than the acceptable noise level, when said program is executed in a processor of a computer. The computer program product according to the invention further comprises code means configured to determine at least one noise evaluation point inside an air S 25 throw pattern of the at least first ventilation device and code means configured to N calculate an estimated noise level produced by a ventilation device of the first sub- = group in said noise evaluation point.
NN - A preferred embodiment of the computer program product according to the invention = further comprises code means for determining a location for a set of first ventilation 5 30 devices in the space and the air throw patterns of the set of the first ventilation de- 3 vices inside the space, code means for determining a noise evaluation point inside D an air throw pattern of at least one first ventilation device of the set, code means for N calculating an estimated noise level produced by said set of ventilation devices in said noise evaluation point and code means for choosing the set of first ventilation devices to the ventilation system from those ventilation devices of the first subgroup, which produce an estimated noise level lower than the acceptable noise level. A second preferred embodiment of the computer program product according to the invention further comprises code means for determining a location for at least one 5 second ventilation device or a set of second ventilation devices inside the space, code means for calculating an estimated noise level in at least one noise evaluation point of the space and code means for choosing at least one second ventilation device or a set of second ventilation devices to the ventilation system from those ventilation devices of the first subgroup, which produce an estimated noise level lower than the acceptable noise level. A third preferred embodiment of the computer program product according to the invention further comprises code means for evaluating the influence of obstacles inside space to the noise level of the space and adjusting the noise level value ac- cordingly. Preferably, the computer program product according to the invention fur- ther comprises code means for evaluating the influence of surface materials of the obstacles to the noise level of the space and adjusting the noise level value accord- ingly. An advantage of the invention is, that the noise level produced by the whole venti- lation system can be easily and reliably evaluated on the planning stage of the ven- — tilation system and different ventilation devices and combinations of ventilation de- vices and their influence to the noise level of the space can be easily compared. A further advantage of the invention is, that it improves the reliability of the evalua- tion of noise level in a space compared to the prior art methods. O : or : S Brief Description of Drawings = 25 In the following the invention will be described in detail, by way of examples, with N reference to the accompanying drawings in which,
I = Fig. 1 depicts an example of a method according to the invention as a flow chart 5 and 2 > Fig. 2 depicts an example of a preferred embodiment of method according to
O N 30 the invention as a flow chart.
Detailed Description In figure 1 an example of a method according to the invention is depicted.
In the method a least one first ventilation device VD1 is selected to a ventilation system of a space from a group of ventilation devices VD.
The ventilation devices may be air supply valves, diffuser or air exhaust valves.
The group of ventilation devices, from which the ventilation devices are selected, may be a product collection of a single manufacturer, seller or importer of ventilation devices or a product collection of a plurality of manufactures, sellers or importers for example.
The ventilation devices produce airborne noise when they are installed in plase to the ventilation system and the system is in operation.
The noise is caused by the air flowing through the holes or gaps of the ventilation device.
The supply air devices, such as valves and diffusers have a throw pattern defining a volume into which air leaving the device mainly spreads.
In the method a first subgroup 10 of possible ventilation devices is chosen based on — the total supply air need and/or extract air need of the space.
The supply air need of the space and the number of valves can be taken from the ventilation plans of the building.
Usually, the air flow through each ventilation device is calculated and ex- pressed in the ventilation plans.
However, if the air flow through a ventilation device is not known, it can be calculated by dividing the supply air need of the space by the number on the supply air valves in the space.
The air flow need of a single exhaust air valve can be calculated in a similar manner.
Each ventilation device has a max- imum air flow capacity.
In principle, each ventilation device having a maximum air flow capacity bigger that the calculated air flow need of a single ventilation device may belong to first subgroup.
S 25 For the space an acceptable noise level L pai of the space is selected.
The noise N level is actually a freguency weighted noise pressure level.
Noise pressure levels = can be weighted by A-, B- or C- weighting factors.
When designing ventilation sys- N tems for building, A-weighting factors is most often used.
The acceptable noise level I of the space can be taken from the building regulations or it can be chosen by the - 30 designer of the ventilation system.
E A location for at least one first ventilation device VD1 is/are determined.
The loca- D tions of the devices are usually shown in the ventilation plan.
Once the location N device in the space is known the air throw pattern of the first ventilation device can be determined.
The air flow pattern of the ventilation is a feature of the device and it depends on the rate and velocity of the air flow through the ventilation device.
In the method according to the invention at least one noise evaluation point EP in- side an air throw pattern of the at least first ventilation device is/are determined and the estimated noise level Lpaest produced by each ventilation device of the first sub- group is calculated in said noise evaluation point.
The calculation of the estimated noise levelin a noise evaluation point can be done by known calculation methods, when the distance between the noise evaluation point and the ventilation device is known.
The eguations used in the calculations can be found for example from a textbook *Ilmastointilaitoksen mitoitus” (Sandberg, 2014)”. The calculations are done for a number of possible ventilation devices, preferably for each ventilation device of the first subgroup.
When the estimated noise levels Lpaest produced by the ventilation devices of the first subgroup in the space are known, the noise levels caused by different ventila- tion devices are compared and a suitable ventilation device for the ventilation sys- tem is chosen.
Naturally, only a ventilation device, which produce an estimated noise level Lpa est lower than the acceptable noise level Lpa1. can be chosen.
In figure 2 an example of a preferred embodiment of the method according to the invention is shown.
In this embodiment location for a set of first ventilation devices VD1 in the space and the air throw patterns of the set of the first ventilation devices inside the space are determined.
Preferably, the first ventilation devices are supply air valves or diffusers.
Further, a location for at least one set of second ventilation devices VD2 inside the space is determined.
Preferably, the second ventilation de- vices are exhaust valves.
A noise evaluation point EP inside an air throw pattern of at least one first ventilation device of the set is determined and an estimated noise level Lpa est produced by said S 25 sets of first and second ventilation devices is calculated in said noise evaluation N point.
When calculating the noise level Lpaestin the evaluation point, the influence of = obstacles inside space to the noise level L pa est is also evaluated and the noise level N L pa est value is adjusted accordingly.
Also, the influence of surface materials of the I obstacle to the noise level Lpaest is evaluated and the noise level Lpaest value is - 30 adjusted accordingly.
E The calculation is done for a number of first and second ventilation device sets and D noise levels of different set combinations are then compared.
The sets of first and N second ventilation devices is chosen from those ventilation device set combinations, which produce an estimated noise level L pa est lower than the acceptable noise level
L pai. Preferably a combination of sets producing the lowest estimated noise level Lpaest IS chosen to the ventilation system. Preferably, the selected first and second ventilation devices are preset by the ven- tilation device supplier, deliverer or manufacturer of the ventilation device. Term ‘“presetting’ here means, that the width of the air-flow gap of the device and the orientation of possible air nozzles are adjusted so, that the air flow through the ven- tilation device is at least close to the designed level, when the ventilation device is installed in place. By presetting the individual ventilation devices already before they are delivered to the construction site, the time needed for presetting the whole ven- tilation system can be shortened. Preferably, the selected first and second ventilation devices are furnished with a tag identifying the space and location of the ventilation device inside the space. The tag may be attached to the ventilation device itself or to the salespackage of the device. The tag may comprise readable text and numbers, machine readable pattern, such as barcode or QR-code or electronic information storing means, such as RFID- tags. The information carried by the tag may include purchase order information, delivery information and installing information, such as installation height of the ventilation device. Some preferred embodiments of the method and computer program product accord- ing to the invention has been disclosed above. The invention is not limited to the solutions explained above, but the invention can be applied in different ways within the limits set by the patent claims.
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Claims (15)

Claims
1. A method for selecting ventilation devices (VD) to a ventilation system of a space from a group of ventilation devices (VD), which ventilation devices have an air throw pattern (TP) and produce airborne noise during operation of the ventilation system, in which method — a first subgroup of possible ventilation devices is chosen based on the total supply air need and/or extract air need of the space, — an acceptable noise level L pai of the space is selected, —a location for at least one first ventilation device (VD1) in the space and the air throw pattern (TP) of the at least one possible first ventilation device (VD1) inside the space is/are determined, — an estimated noise level Lpaest produced by a ventilation device (VD) of the first subgroup in the space is calculated and — at least one first ventilation device (VD1) to the ventilation system is chosen from those ventilation devices (VD) of the first subgroup, which produce an estimated noise level Lpa, est lower than the acceptable noise level Lp, characterized in that — at least one noise evaluation point (EP) inside an air throw pattern (TP) of the at least first ventilation device (VD1) is/are determined and —the estimated noise level Lpaest produced by a ventilation device of the first sub- group is calculated in said noise evaluation point (EP).
2. A method according to claim 1, characterized in that — a location for a set of first ventilation devices (VD1) in the space and the air throw patterns (TP) of the set of the first ventilation devices (VD1) inside the space are determined, N — a noise evaluation point (EP) inside an air throw pattern (TP) of at least one first N ventilation device (VD1) of the set is determined, - — an estimated noise level Lpaest produced by said set of ventilation devices is cal- N culated in said noise evaluation point (EP) and E 30 —the set of first ventilation devices (VD1) to the ventilation system is chosen from - those ventilation devices (VD) of the first subgroup, which produce an estimated o noise level Lpa esti lower than the acceptable noise level Lpm. o >
3. A method according to claim 1 or 2, characterized in that a ventilation device (VD) or a set of ventilation devices (VD) producing the lowest estimated noise level — Lpa estin at least one noise evaluation point (EP) is chosen to a first ventilation device (VD1) or to the set of first ventilation devices (VD1) of the ventilation system.
4. A method according to any of the claims 1 to 3, characterized in that — a location for at least one second ventilation device (VD2) or a set of second ven- tilation devices (VD2) inside the space is determined, — an estimated noise level Lpacal in at least one noise evaluation point (EP) of the space is calculated and — at least one second ventilation device (VD2) or a set of second ventilation devices (VD2) to the ventilation system is chosen from those ventilation devices of the first subgroup, which produce an estimated noise level Lpa est lower than the acceptable noise level L pa.
5. Amethodaccording to claim 4, characterized in that a ventilation device (VD) or a set of ventilation devices (VD) producing the lowest estimated noise level Lpa, estin at least one noise evaluation point (EP) is chosen to a second ventilation device (VD2) or to the set of second ventilation devices (VD2) of the ventilation system.
6. A method according to any of the claims 1 to 5, characterized in that, when — calculating the noise level Lpaest of the space, the influence of obstacles inside space to the noise level Lpaest is evaluated and the noise level Lpaest value is ad- justed accordingly.
7. Amethod according to any of the claims 6, characterized in that, when calcu- lating the noise level Lpaest of the space, the influence of surface materials of the obstacle to the noise level Lpaest is evaluated and the noise level Lpaest value is adjusted accordingly.
8. Amethodaccording to any of the claims 4 to 7, characterized in that, a preset adjustment is made to the selected first and/or second ventilation devices (VD1, o VD2) and the ventilation device (VD1, VD2) is furnished with a tag identifying the O 25 space and location of the ventilation device (VD1, VD2) inside the space.
-
9. A method according to any of the claims 1 to 8, characterized in that, the first N ventilation device (VD1) is a supply air valve or diffuser.
I ,
10. A method according to any of the claims 4 to 9, characterized in that, the io second ventilation device (VD2) is an exhaust air valve.
O 2 30
11. A computer program product for selecting ventilation devices (VD) to a venti- lation system of a space from a group of ventilation devices (VD), which ventilation devices have an air throw pattern (TP) and produce airborne noise during operation of the ventilation system, said computer product comprising
— code means configured to produce a first subgroup of possible ventilation devices based on the total supply air need and/or extract air need of the space, — code means configured to select an acceptable noise level L pai of the space, — code means configured to determine a location for at least one first ventilation device (VD1) in the space and an air throw pattern (TP) of the at least one possible first ventilation device (VD1) inside the space, — code means configured to calculate an estimated noise level Lpaest produced by a ventilation device (VD) of the first subgroup the in the space and — code means configured to choose at least one first ventilation device (VD1) to the ventilation system from those ventilation devices (VD) of the first subgroup, which produce an estimated noise level Lpa est lower than the acceptable noise level Lpai, when said program is executed in a processor of a computer, characterized in that said computer program product further comprises — code means configured to determine at least one noise evaluation point (EP) in- side an air throw pattern (TP) of the at least first ventilation device (VD1) and — code means configured to calculate the estimated noise level Lpaest produced by a ventilation device of the first subgroup in said noise evaluation point (EP).
12. A computer program product according to claim 11, characterized in that it further comprises —code means for determining a location for a set of first ventilation devices (VD1) in the space and the air throw patterns (TP) of the set of the first ventilation devices (VD1) inside the space, — code means for determining a noise evaluation point (EP) inside an air throw pat- tern (TP) of at least one first ventilation device (VD1) of the set, —code means for calculating an estimated noise level Lpaest produced by said set o of ventilation devices in said noise evaluation point (EP) and O — code means for choosing the set of first ventilation devices (VD1) to the ventilation — system from those ventilation devices (VD) of the first subgroup, which produce an N estimated noise level Lpa esti lower than the acceptable noise level L pas.
N E 30 13. A computer program product according to claim 11 or 12, characterized in - that it further comprises o — code means for determining a location for at least one second ventilation device > (VD2) or a set of second ventilation devices (VD2) inside the space, N — code means for calculating an estimated noise level Lpaca in at least one noise evaluation point (EP) of the space and
— code means for choosing at least one second ventilation device (VD2) or a set of second ventilation devices (VD2) to the ventilation system from those ventilation devices of the first subgroup, which produce an estimated noise level Lpa est lower than the acceptable noise level L par. 14 Acomputer program product according to any of the claims 11 to 13, charac- terized in that it further comprises — code means for evaluating the influence of obstacles inside the space to the noise level Lpa est Of the space and adjusting the noise level value accordingly.
15. Acomputer program product according to any of the claims 14, characterized in that it further comprises — code means for evaluating the influence of surface materials of the obstacle to the noise level Lpa est of the space and adjusting the noise level value is accordingly.
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FI20196051A 2019-12-03 2019-12-03 Method and computer program product for selecting ventilation devices FI128922B (en)

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FI20225414A1 (en) 2022-05-11 2023-11-12 Climecon Oy Method and computer program product for selecting ventilation devices to a sustainable ventilation system

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