WO2014012528A2

WO2014012528A2 - Device for measuring the air density of a building envelope

Info

Publication number: WO2014012528A2
Application number: PCT/DE2013/000373
Authority: WO
Inventors: Klaus-Dieter JENDROSCH
Original assignee: Jendrosch Klaus-Dieter
Priority date: 2012-07-20
Filing date: 2013-07-12
Publication date: 2014-01-23
Also published as: WO2014012528A3; DE102012014417B4; DE102012014417A1

Abstract

The invention relates to a device for measuring the air density of a building envelope (1), having at least one building opening (2) leading to the atmosphere, comprising at least one blower (4a, 4b, 4c, 4d) surrounded by a housing (3), wherein the housing (3) has an air inlet side (5) and an air outlet side (6) and can be connected to the building envelope (1) in a sealing manner via connection aprons (7) around the building opening (2). The invention addresses the problem of improving a generic device in such a manner that a more exact measuring result than the prior art is possible without mounting and dismounting the housing (3). According to the invention, the problem is solved by a device in which the at least one blower (4a, 4b, 4c, 4d) is pivotably arranged within the housing (3), wherein the air inlet side (5) and the air outlet side (6) change by means of swivelling.

Description

DEVICE FOR MEASURING THE AIR LIGHTNESS OF ONE

BUILDING ENVELOPE

description

The invention relates to a device for measuring the airtightness of a building envelope, which at least one leading to the atmosphere

Building opening comprising at least one of a

Housing surrounding fan, wherein the housing has an air inlet side and an air outlet side and sealing aprons around the building opening with the building envelope is sealingly connected.

A measurement of the airtightness of buildings is usually carried out with a differential pressure measurement method called a "blower door test", in which the building interior is subjected to a measuring pressure (differential pressure) in relation to the environment Building opening, for example, an open external door or an open window, a blower used and its housing pressure-tight connected to the building surrounding the building wall opening

The speed of the blower is controlled in such a way that a defined pressure is established between the atmosphere and the building interior. In order to maintain this pressure, the fan must deliver such a high volume flow that it compensates for leakage through building envelope leaks. This volume flow is measured and compared to the volume of the building envelope in order to be able to provide a meaningful parameter for airtightness.

Such a method together with a suitable device disclosed in DE 31 06 191 A. The known device should have an air inlet and an air outlet, wherein between these a blower

confirmation copy is arranged and generates a negative pressure within the building envelope. Both the air inlet and the blower are located in

ready working position within the building envelope and only the air outlet is sealed led out of the building envelope. The main disadvantage of the known device is that for a measurement according to DIN 13829 within the building envelope successively both an overpressure and a vacuum must be generated. This is to be avoided, for example, an overlapping laid but not glued together vapor barrier at a

Vacuum measurement sealingly on each other and suggests a supposedly dense building envelope. In a positive pressure measurement, this point could be identified as a leak. For a corresponding measurement, the complete device would have to be removed and re-installed outside the building envelope, since the fan is calibrated in one direction only.

EP 0 275 896 A2 describes a ventilation device with a radial fan fixedly arranged therein and with it

cooperating fan housing, which is rotatably mounted by 180 ° and depending on the position allows venting or venting a room. However, it has proved to be disadvantageous that a separate calibration must be carried out for the respective switching position of the blower housing. In addition, result from the

multiple redirections of the air flow high flow losses, so that can be determined hardly reproducible measured values and a calibration can only be realized with high fault tolerance.

Thus, the invention has the object to improve a generic device such that a comparison with the prior art more accurate measurement result without assembly and disassembly of the housing is possible. The object is achieved by a device in which the at least one fan within the housing

is pivotally mounted, wherein changes by pivoting the at least one fan relative to the housing, the air inlet side and the air outlet side. Under a pivotable mounting a permanent attachment of the at least one fan is understood, which has a single axis of rotation. The pivoting takes place in particular as a 180 ° movement of the at least one fan. A fan is understood to mean a motor-driven fan rotor.

In operational position, for example, first by means of

Blower generates a negative pressure, that is, a volume flow is conveyed out of the building shell. After completion of this measurement in a first position, a 180 ° rotation of the fan within the housing takes place in a second position, so that the former

Air outlet side is now the air inlet side and vice versa. In the second position of the at least one blower, a volume flow is conveyed into the building envelope and an overpressure is built up. The main advantage of the device according to the invention is that the volume flow measurement always calibrated in the only

Conveying direction of the at least one fan takes place.

In addition, no re-sealing measures between the housing and the building envelope after pivoting of the blower must be made.

After or before pivoting, the at least one fan may be fixed by means of locking elements in order to prevent inadvertent displacement of the at least one fan relative to the housing. Preferably, the at least one fan is arranged in a partition wall and secured thereto at a fixed location. The partition wall then rotates in a carousel fashion together with the at least one fan between the air inlet side and the air inlet side of the housing. The advantage of the partition is to reduce pressure losses between the at least one fan and the inner wall of the housing. The

In addition, the partition wall always carries one or more fans in a modular manner and expediently also the associated ones

Power supply lines and data lines.

According to a particularly advantageous embodiment, the partition wall is rotatably supported by means of two opposing pivot bearings.

This may in particular be arranged on the partition wall pins which are held in complementary receptacles of the housing. Likewise, the pins may be formed on the housing and engage in receptacles of the partition. The pivot bearings are preferably plain bearings.

Conveniently, the pivot bearings are aligned in a vertical

Pivot axis. This embodiment results in that only the lower pivot bearing by the weight of the partition as

Thrust bearing and the upper pivot bearing is claimed as a train bearing. The pivot bearings can attack in particular on the partition and the housing. However, the compressive force acting on the lower pivot bearing can be relatively easily dissipate into the housing and thus a substructure located underneath.

It is also possible in principle to execute the pivot axis of the partition horizontally. In this case, however, the weight of the partition must be introduced into the two lateral portions of the housing, the journals are then loaded orthogonal to their axial extent and must be made correspondingly solid. Conveniently, a plurality of blowers are provided, which are individually switched on and off. As a result, extremely large building envelopes such as hardware stores or warehouses can be checked for their airtightness. Particularly in the case of several fans and the resulting large mass, the integration of the fans, in particular when mounted in a common partition, is particularly advantageous. In addition, the fans can always remain connected to the associated control technology. If it should turn out on site that a larger volume flow has to be conveyed by the device, the desired flow rate can be achieved, for example, by connecting another blower. Especially big

Flow rates can indeed be realized with a single large blower; However, this is due to its plant specific

Characteristic is not suitable to provide a very low flow in another application.

If only a portion of the installed blower is put into operation, the blowers not required are sealingly covered to prevent pressure equalization to the atmosphere via the stationary / standing blower.

Advantageously, the fans have a common conveying direction. In this direction of delivery, the fans are calibrated and achieve their optimum efficiency due to plant-specific parameters.

It has been found to be particularly advantageous if at least one fan in the form of an axial fan is arranged in the partition wall. If several axial fans are present, they can be arranged side by side in a simple way due to their compact design and do not require additional flow channels or internals, which would reduce the efficiency of the entire device. The axial fans should preferably be aligned axially parallel to each other.

Advantageously, a single, common flow channel is formed in the conveying direction on both sides of the axial fan. This

Flow channel passes through the housing in the conveying direction

Completely.

Conveniently, the partition fills in an operational ready

Working position the clear cross section between the one or the other

Axial fan (s) and the inner wall of the flow channel, whereby pressure losses between the pressure side and the suction side of the fan are minimized.

Conveniently, the housing is fixedly mounted on a trailer. This embodiment favors the placement of large multi-fan devices. The trailer will be in front of the to be measured

Building shell set up and does not need to be moved during the entire measurement.

According to a particularly preferred embodiment, the housing is closable with side walls, wherein the side walls are arranged pivotably relative to the housing and form connection aprons. For this purpose, for example, be carried out a side wall divided and thereby have centrally adjacent side walls. These can preferably be swung out via external hinges located on the housing and establish a connection to the building envelope. Preferably, doubles grip on one side of the housing

Sidewalls, which can be swung in four sub-areas in the direction of the building envelope, thereby forming a connection channel. The invention will be explained in more detail for better understanding with reference to four figures. It show the

Fig. 1: a side view of a device with four

blowers;

Fig. 2: a plan view of a device at

opened housing in working position in front of a building envelope;

3 shows a cross section through the housing without

Blower with flared aprons and

4 shows a further embodiment of the invention with a device arranged on a trailer.

Fig. 1 shows a side view of the air outlet 6 of a box-shaped housing 3, against a conveying direction X (see Fig. 2) of the device according to the invention. The housing 3 surrounds a flow channel 12 passing through in the axial direction.

The flow channel 12 is closed in operational position at half its axial length by a partition 8, which extends directly to an inner wall 13 of the flow channel 12. The partition 8 carries a total of four fans 4a, 4b, 4c, 4d and forms with these an integral unit. The fans 4a, 4b, 4c, 4d are each designed as axial fans 10. The four fans 4a, 4b, 4c, 4d allow a flow rate of 100,000 m ³ / h to 150,000 m ³ / h, which is supported by a, for example, 2 mx 2m large building opening 2 (see Fig. 2). For the promotion of such a volume flow, the arrangement of multiple fans 4a, 4b, 4c, 4d offers. Due to the complexity of

Power supply as well as data transfer and high

Dead weight of the multiple fans 4a, 4b, 4c, 4d consists in

In connection with the pivotability according to the invention a special synergistic effect, since the device need not be rebuilt during the measurement.

The partition wall 8 is attached to the housing 3 in a permanent and non-detachable manner via two pivot bearings 9a, 9b. The pivot bearings 9a, 9b engage on opposite sides of the partition wall 8 and are also in the axis of symmetry, so that a pivoting of the partition 8 by 180 ° without lateral offset is possible. The

Pivoting direction a can be clockwise or counterclockwise

Clockwise take place about a pivot axis Z. The partition 8 is stiffened on one side with a support frame 16.

In operational position, the partition 8 is against a

unintentional pivoting with locking elements 17a, 17b secured to the housing 3. The locking elements 17a, 17b may in particular be bolts, threaded bolts or wedges, which are preferably designed to be complementary from outside through the housing 3

Shooting the partition wall 8 are inserted and this

hold positively.

The laterally projecting from the housing 3 side walls 14a, 14b form terminal skirts 7, which during a measuring insert in, on or laterally adjacent to a building opening 2 sealingly with the

Be connected building envelope 1, as particularly good in Fig. 2 to recognize. The building envelope 1 comprises in particular a side wall of a building or a hall. The two horizontal planes between the connection skirts 7 are sealed between the housing 3 and the building envelope 1 with foil.

As the plan view of FIG. 2 can also be seen, are the

Side walls 14 a, 14 b fixed by means of hinges 21 to the housing 3. In the fully swung out position are the

Side walls 14a, 14b maximum of the housing 3 and bridge the distance between the housing 3 and the building envelope. 1

FIG. 2 shows a position of the dividing wall 8, in which the

Blower 4a, 4b, 4c, 4d work in the conveying direction X and the

Building envelope 1 from the inside with an overpressure opposite the

Apply atmosphere. The housing 3 has

Each of the opposite sides has an air inlet side 5 and an air outlet side 6. For a vacuum measurement, the

Blower 4a, 4b, 4c, 4d stopped and the locking elements 17a, 17b released. Subsequently, the partition 8 can be at their

Swivel axis Z and turn her visible, upper pivot bearing 9a by 180 °. During pivoting, the housing 3 and the partition 8 remain in constant operative contact. In the rotated by 180 °

Position of the partition wall 8, the fans 4a, 4b, 4c, 4d are restarted. In this position, the conveying direction X has reversed and an adjustable volume flow is from the building envelope. 1

conveyed out.

Each fan 4a, 4b, 4c, 4d has its own fan motor 15a, 15b, 15c, 15d, wherein in the plan view of Fig. 2, only the upper two fan motors 15a, 15b are visible. The fan motors 15a, 15b, 15c, 15d are always in the conveying direction X before the associated

Fan rotors 22a, 22b, 22c, 22d arranged. Fig. 3 shows a cross section through the housing 3 without fan 4a, 4b, 4c, 4d. The flow channel 12 extends horizontally through the

Housing 3, wherein in the middle of the upper pivot bearing 9a is arranged. The side wall 14a is maximally swung out and has approximately the vertical height of the housing 3. For transport, the side walls 14a, 14b can be folded against the housing 3 and thereby completely close it on one side.

Fig. 4 illustrates a particular embodiment of the device according to the invention, which is fixedly mounted on a trailer 18. The trailer 18 can be detachably connected to a vehicle via a drawbar 19 and a coupling 20 attached to the end thereof and thus be brought to the place of application of a measurement. Of the

Trailer 18 is parked in front of the building opening 2 of a building envelope 1 (see FIG. 2) and the connection aprons 7 unfolded. After making an electrical power supply to operate the fan 4a, 4b, 4c, 4d and a finishing remaining

Sealing work between the housing 3 and the building envelope 1 can be started immediately with the measurement. The device is always ready for use, so that additional set-up times for construction or conversion are not needed.

LIST OF REFERENCE NUMBERS

building envelope

building opening

casing

a-d blower

Air intake side

air outlet

connection Aprons

partition wall

a, b pivot bearings

0 axial fan

1 trailer

12 flow channel

13 inner wall flow channel

14a, b sidewall

15a-d fan motor

16 support frame

17a, b locking elements

18 followers

19 drawbar

20 clutch

21 hinge

22a-d fan rotor a swing direction

X conveying direction

z pivot axis

Claims

claims

1. A device for measuring the air-tightness of a building envelope (1), which at least one leading to the atmosphere

Building opening (2), comprising at least one of a housing (3) surrounding blower (4a, 4b, 4c, 4d), wherein the housing (3) an air inlet side (5) and a

Has air outlet side (6) and sealing aprons (7) around the building opening (2) with the building envelope (1) is sealingly connectable,

characterized,

in that the at least one fan (4a, 4b, 4c, 4d) is pivotably mounted inside the housing (3), wherein the air inlet side (5) and the air outlet side (6) change by pivoting.

2. Apparatus according to claim 1, characterized in that the at least one fan (4a, 4b, 4c, 4d) is arranged in a partition wall (8).

3. Apparatus according to claim 2, characterized in that the partition wall (8) by means of two opposing

Swivel bearing (9a, 9b) is rotatably mounted.

4. Apparatus according to claim 3, characterized in that the pivot bearings (9a, 9b) in a vertical pivot axis (Z) are aligned.

5. Apparatus according to claim 3 or 4, characterized in that the pivot bearings (9a, 9b) on the partition wall (8) and the housing (3) engage.

6. Device according to one of claims 1 to 5, characterized

characterized in that a plurality of blowers (4a, 4b, 4c, 4d)

are provided, which are individually switched on and off.

7. Device according to one of claims 1 to 6, characterized

in that the blowers (4a, 4b, 4c, 4d) have a

have common conveying direction (X).

8. Device according to one of claims 1 to 7, characterized

in that a plurality of fans (4a, 4b, 4c, 4d) in the form of axial fans (10) are arranged in the dividing wall (8).

9. Apparatus according to claim 8, characterized in that the axial fans (10) are aligned axially parallel to each other.

10. Apparatus according to claim 8 or 9, characterized in that in the conveying direction (X) on both sides of the axial fan (10), a single common flow channel (12) is formed.

11. The device according to claim 10, characterized in that the partition wall (8) in an operative working position the clear cross section between the axial fans (10) and the

Inner wall (13) of the flow channel (12) fills.

12. Device according to one of claims 1 to 10, characterized

characterized in that the housing (3) is fixed on a

Trailer (11) is attached.

13. Device according to one of claims 1 to 11, characterized

characterized in that the housing (3) is closable with side walls (14a, 14b), the side walls (14a, 14b) being closable. are arranged pivotably relative to the housing (3) and form connection skirts (7).