Stulz BNB1000 User manual

ULTRASONIC/BNB

TECHNICAL MANUAL

Issue 10.94e

AIR CONDITIONING

We reserve the right to make technical changes

List of contents

1. Application areas and method of operation ............................................................3

2. Technical data for the BNB model range.................................................................5

2.1 Humidifier section...........................................................................................6

2.2 Dimensional drawing ......................................................................................7

2.3 Description of unit...........................................................................................8

3. Capacity calculation for ultrasonic air humidifiers .................................................10

3.1 Questionnaire about ultrasonic humidifying systems....................................12

4. Switching operation and control............................................................................14

4.1 Design of two-point (ON-OFF) control..........................................................15

4.2 Design of proportional control ......................................................................21

4.3 Method of operation of proportional adapter ................................................27

4.4 Connecting pipes between the humidifiers

and the switching operation and control .......................................................29

4.5 Electrotechnical information on BNB............................................................31

5. Installation, commissioning and application limits.................................................33

5.1 Installation of BNB model range...................................................................34

5.2 Examples for the mounting of BNB humidifiers ............................................43

5.3 Commissioning of BNB humidifiers ..............................................................46

5.4 Precautionary measures during operation....................................................47

6. Accessories ..........................................................................................................48

6.1 Data sheet on safety transformers................................................................48

6.2 Information on conductivity measuring instrument .......................................49

1. Application areas, method of operation

BNB Model range

Units of the ultrasonic BNB 1000 to BNB 8000 model range are available for direct room

humidifying. The key components of this unit consist of high-quality steel or high-quality

plastic. A fan is integrated into chassis which carries the mist generated in the water bath

out into the room. This unit is used, for example, for humidifying production rooms, EDP

rooms, warehouses, printing plants,museums, restoration workshops, theatres and many

other areas, in which optimum humidity is necessary for production, storage or to maintain

room air conditions.

Method of operation

The STULZ ULTRASONIC model range of air humidifiers work in accordance with the

principle of ultrasonic atomization. A 48 V alternating voltage is rectified on a printed

circuit board and converted into a high frequency signal of 1.65 MHz. This signal is

transmitted to a transducer installed in a water bath which converts this signal into a high-

frequency mechanical vibration. The transducers installed are so-called thickness

transducers which change their thickness 1.65 million times per second corresponding to

the applied signal of 1.65 MHz.

The surface of the transducer vibrates at such a high

speed that the water can no longer keep up due to its

mass moment of inertia and a water column builds up

above the transducers immediately after the unit is

switched on. During the negative amplitude of the

transducer, the water cannot follow the rapid movement

andaninstantaneousvacuum is created. Bubblesoccur

due to cavitation which are “catapulted” to the edge of

the water column in the curve of positive amplitude and

collide with each other with a large force. During this

process the finest particles of water are atomized at the

edgeofthewatercolumn. Cardanwavesaregenerated

duetothefocusingofthesoundwaves right underneath

the water surface, in the center of which the smallest

water droplets detach and produce a mist which is

immediately picked up by the air flow.

After switching on transducer

Negative amplitude

Positive amplitude

vacuum

transducer

2.Technical information on the BNB model range

The BNB ULTRASONIC humidifier works in accordance with the principle of ultrasonic

atomization. The mist, which is produced in a water tank with the aid of a transducer, is

blown into the room by a built-in fan. The humidifier consists of the atomization modules,

the supply module with a solenoid valve, via which the water supply runs, as well as float

switch and a housing in which a fan is accommodated. A switchgear cabinet must be

located externally which contains the control as well as the power supply of the unit.

Model BNB BNB BNB BNB BNB BNB

1000 2000 3000 4000 5000 8000

Output* l/h 1.0 2.0 3.0 4.0 5.0 8.0

2x2.5 2x4.0

Number of transducers 2 4 6 8 10 16

Transformer Primary: 110V/208V/230V/400V/460V ± 15V 50/60 Hz

Secondary: 12V/24V/36V/42V/48V/52V

Nominal output W 100 180 250 340 430 670

Transformer output VA 160 320 320 500 500 2x500

Weight kg 7.1 9.3 11.2 14.0 16.1 23.0

Dimensions A mm 254 364 474 584 694

1024

Dimensions P mm 220 330 440 550 660

990

We reserve the right to make technical changes/*output at: water height of 40 mm, air

temperature of 26°C, water temperature of 26°C, voltage 48 V.

Application condition: Temperature 5°C to 40°C, relative humidity below 90%.

Water supply: Only demineralized water < 20 µS/cm may be introduced into

the humidifier as supply water. The water pressure to the

humidifier should be between 0.5 bar and 6 bar, and the water

temperature between 5°C and 40°C.

2.1 Humidifier section

The length of the humidifier section depends on various factors.

> even distribution of the mist in the air flow

> temperature of the air

> rel. humidity of the air

> air speed

The diagram below for determining the length humidifier section contains recommended

values depending on the most important parameters. The tolerance is ± 0.5 meters.

Humidifier section (m)

% rel. humidity upstream of the humidifier

Use of a proportional control is another alternative for reducing the humidifier section.

This reduces the output of the humidifiers as required for more than 90% of the operating

time and thus reduces the humidifier section, preserves the transducers and maintains

the even distribution of the mist even in part load operation.

- The measurement is made with the air flap control “max”. The humidifier section

reduces in the “min” position.

- Theremainderofthemiststream can be seenonablackbackground overthe specified

sections.

2.2 Dimensional drawings

For dimensions A and P see Page 6 under “Dimensions”

Legend:

1 Humidifier unit 10 Safety overflow

2 Fan housing 11 Mist guide pipe

3 Mist guide cover 12 Ring and nut

4 Fan 13 Installation foot

5 Metal plug 14 Air filter

6 Cable 15 Water supply*

7 Metal plug 16 Shut-off valve*

8 Cable 17 Air flap controller

9 Water drain *

provided by customer

2.3 Description of unit

Safety precautions

Automatic supply water monitoring by solenoid valve and float switch. Protective device

against running dry; if the water drops below a preset level, the float switch and relay are

automaticallyoperatedtoswitchoffthepowersupply. A thermostat switches off the current,

if the temperature in the air humidifier rises above a preset point.

Fuses and varistors are installed to protect the electronics.

Description of the main components

1. Humidifying unit

Ultrasonic atomization modules, the solenoid valve and the float switches are

accommodated in the high-quality steel housing.

2. ULTRASONIC atomization module

ThecompactULTRASONICatomizationmoduleisaccommodatedinthebaseofthewater

container. It contains the vibration generating circuit, an amplifier and a transducer. The

resultantultrasonicvibrationsaredirectedtowardsthe water surface. Thewaterisatomized

in this way.

3.Water supply solenoid valve and float switch

In order to achieve optimum atomization of the water. The water level in the container

must be kept as constant as possible.In order to meet this condition, a solenoid valve and

a float switch are used for automatic water supply control. With this equipment, if the water

level in the container falls below the normal level, the float switch switches to ON and the

solenoid valve opens, in order to release the water supply to the container. If the normal

water level is reached, the float switch switches to OFF and the solenoid valve is closed.

4. Relay (external, in control box) and float switch (dry protection)

The transducer will be damaged if the humidifier is operated with a reduced water level. A

float switch and a relay (in the control station) are interposed to prevent such an operating

condition. If the water level falls below the safety level for any reason, the float switch

switches to OFF, operates the relay and thus switches off the electrical power supply to the

unit.

5. Fan

The mist generated in the water tank is carried into the room by the fan. A special design

makesitpossibletogenerateavariablesupportingairflowinorderto ensurerapiddispersal

of the aerosols.

Air outputs

Model BNB BNB BNB BNB BNB BNB

1000 2000 3000 4000 5000 8000

Output*

m3/min 1.2 1.8 2.4 3.6 4.2 6.6

* the values apply to a supply voltage of 48 V / 50 Hz

3. Capacity calculation for ultrasonic air humidifiers

Example:

Humidification of a room with gap ventilation.

The following data is required to determine the humidifier output for rooms without a

ventilation system:

Example:

> Size of room (m)3500 m3

> Temperature, humidity in room 22°C /50% rel.

> Conditions of outside air (temp., humidity) 0°C /87% rel.

> Estimate of gap ventilation (windows, doors) 500 m3/h

The gap ventilation for a new building where the door is opened < twice per hour is < 1

times the room volume

Calculation of humidifier output

Determine the∆X from the room condition and the outside air condition in the h/x diagram

Determine the air quantity which is to be humidified

by 5 g/kg.

The example involves an air change/hour

Size of room 500 m3x 1 air change x 1.2 air density =

600 kg/hour

Humidifier output

Weight of air x ∆x = humidifier output required

600 kg/hour x 5 g/kg air = 3000 g/hour humidifier

output required

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