Biddle nozzlebroch eng.247256 - Eveco AB · Indirectly fired air heaters Biddle nozzlebroch...

Model NOZ

Indirectly fired air heaters

Biddle nozzlebroch eng•247256 22-04-2004 15:39PM Pagina 3

Indirectly fired air heatersAir heaters are fit for heating and/or ventilating large-space industrial andcommercial buildings. The Biddle air heater, model NOZ, can be applied inrooms of 4 to 16 metres high. The fast and even distribution of heat makesthis ceiling model fit for use in, for instance, DIY markets, factory buildings,distribution centres and warehouses.

If there is a need for fresh air in a room, the air heater may also be used forventilation purposes. Accessories for that are available from Biddle (see page 3).

Induction

The air heater has individually adjustable nozzles, thus providing a better distribution of the air. Warm air is discharged downward through the nozzles in adjustable directions.The air flow draws the surroundingstill air along, resulting in goodmixing (induction). This makes thatthe warm air will spread across alarge area quickly and evenly. To calculate the air circulationratio, an air induction ratio of 2 (low speed) to 4 (high speed) may be taken.

Various options

The air heater is available in two types: the NOZ 25 and the NOZ 50.The unit comes, as a standard, with a 2-row heating battery that is suitablefor water temperatures of 90/70°C. At lower water temperatures or in situations where more heating capacity is needed, a 3-row heating battery is available. The type code is obtained by choosing one option from eachcolumn. An instance of a type code is NOZ 25–W2-D.

Benefits of indirectly fired air heatersinclude:

• No flue gas discharge• Hardly any maintenance• Safe• Relatively low investment• Eye-catching design

Type code

NOZ 25-W2-D

NOZ = air heater with nozzles

25 / 50 = nominal heatingcapaciteit kW

W2 = standard 2-rowheating battery

W3 = 3-row heating batteryfor lower water temperature ranges

E = 230 VoltsD = 400 Volts

2

Type Heating battery Supply voltage

NOZ 25 W2 = 2-row heating battery E (230 Volts, AC, 50 Hz)W3 = 3-row heating battery D (400 Volts, AC, 50 Hz)

NOZ 50 W2 = 2-row heating battery D (400 Volts, AC, 50 Hz)W3 = 3-row heating battery


Installation

The air heater can be suspended anywhere in the room. Thanks to the adjustable nozzles, stands or racks form no obstacles to a free flow of air.The recommended mounting height is 3 - 14 m, measured from the bottom of the unit.

There are two mounting options:1. With a suspension frame (available as an accessory), to which four threaded

ends are fixed with nuts. The nuts fit into purpose-made “keyholes”. 2. Without a suspension frame, use being made of four M8 threaded ends.

Guard grille

For safety reasons, each nozzle comes standard with a guard grille.

Accessories

Biddle supplies various additional accessories.

• control switch: 2 or 5 speeds (see page 6)• water-temperature control: for regulating the discharged air temperature• room thermostat and thermostat with frost protection• suspension frame: for fast and simple mounting• plastic covers (2): to cover up nozzles.

Accessories, ventilation model

• aluminium vent cap and roof vent flange• duct sections: 0.5 or 1 metre long • filter module: filter class G2• damper module: operated using the corresponding valve motor

(with or without spring return)

There are 2 types:

1. 1-way damper module: used with 100% ventilation, so no draught or heatloss occurs when the air heater is off.

2. 3-way damper module: used if not only outside air but also inside air is drawn in (recirculation). Thus, the ratio between these air flows may be influenced.

Suspension frame makes mountingeasy.

3

Guard grille


Air heater selectionFor a quick selection, the data from the below table may be used. The figures are based on a water temperature range of 90/70°C, an air inlet temperature of 15°C, and a room heat loss of 20 Watts/m3.

Type Heating- Mounting- Influence- Applicationcapacity height1 area

NOZ 25 25 kW 2.8 m - 400 m2 - - smaller rooms8.5 m 100 m2 - higher comfort demands*

NOZ 50 50 kW 3.5 m - 800 m2 - - larger rooms14 m 200 m2 - lower comfort demands*

1 measured from the bottom of the unit

Influence area and downward penetration

To optimise the distribution of the discharged air, the nozzles can be adjusted.The correct air flow direction is dependent on the mounting height of theunit.

First, you select an air heater type based on the desired capacity. With that,you may make use of the capacity tables on pages 7 to 11. Having made thisselection, you determine whether the downward penetration and the influencearea correspond with the needs based on the diagrams on page 5. In theselection example, a NOZ 50 with an air displacement of some 5,000 m3/hand a difference (∆t) of 15°C between the average room and outlet tempe-rature are assumed.

Diagram 1: determine the intersection (a) of the lines indicating the air displacement and the temperature differential.

Diagram 2: from this point (a), draw a horizontal line and determine theintersection (b) using the line of the NOZ 50.

Diagram 3: from this point (b), draw a vertical line downwards and determinethe intersection (c) using the line indicating the desired downwardpenetration (H). In the example, this is approximately 5 m(distance from unit bottom to floor). Continue to draw this lineto the bottom of the diagram.

Diagram 4: from the intersection (c), draw a horizontal line to the left,draw a horizontal line via the auxiliary figures (200) and, fromthere, a vertical line upwards. On the intersection (d) of bothlines, the direct influence area can be read. On the left sides ofthe diagrams 3 and 4, the nozzle angle settings are indicated.

* If comfort is set higher demands on, it is recommended to use multiple units of lower heating capacity.

Representation of the downward penetration (H) and the influence area (D).

D 800 - 100 m2

3.0 - 14.0 m

Example

1.Diagram 1: approx. 5000 m3/h∆t = 15°C

2.Diagram 2: type NOZ 50

3.Diagram 3: nozzle angle = 33ºdownward penetration = 5 m

4.Diagram 4: nozzle angle = 33°influence area =24 m

4


Air displacement [m3/h]

5

0 0 25 50 75 100 125 150 250 275 300 3251000 2000 3000 4000 5000 6000 7000 8000 9000 10000

∆t=15ºC NOZ 50

NOZ 25

403530

25

20

0 25 50 75 100 125 150

D= 4m 8 12 16 20 24 28 32 36 40

13

18

23

28

38

43

48

53

Noz

zle a

ngle

α

H=1m

14

13

12

9

8

7

6

4

3

175

175

33

5

d c

a b

2500240023002200210020001900180017001600150014001300120011001000900800700600500400300200100

0

2500240023002200210020001900180017001600150014001300120011001000900800700600500400300200100

0200 225 350 375 400

200 225 250 275 300 325 350 375 400

10

11

15

16

17

13

18

23

28

38

43

48

53

33

0 25 50 75 100 125 150 175 225 250 275 300 325 350 375 400200

2

Diagram 1: air displacement and ∆t Diagram 2: air heater type

Diagram 3: downward penetrationDiagram 4: influence area

Noz

zle a

ngle

α

* The figures below the diagrams 2, 3 and 4 are auxiliary figures, which have no further meaning.

Air heater selectionInfluence area and downward penetration


Electric connectionProvisions for connecting isolation switch

Speed controller

If multiple units are connected to a single speed controller, the thermal contacts must be switched in series. There are three speed controllers.

6

Dimensions of speed controller (mm)

Type (w x h x d)RKE: 3 - 6 - 9A 160 x 400 x 140RKD: 2.5 - 5A 180 x 540 x 100

- 10A 210 x 610 x 200SDD: - 10A 180 x 540 x 100

Speed controller with pilot light andconnections for room thermostat and thermal contacts.

Type RKE:

- 5 speeds- 230 Volts - 3, 6 or 9 A- IP 21

230 Volts

400 Volts, low speed (Y)400 Volts, high speed (∆)

400 Volts, low/high speed (Y/∆)

Type RKD:

- 5 speeds- 400 Volts - 2.5, 5 or 10 A

- IP 21

Type SDD: (Y/∆)

- 2 speeds- 400 Volts- 10 A- IP 21


7

* tLi = air inlet temperature** Air displacement is less with ventilation models - if 1 module is used, by 15% and as a whole, by 20%.

Technical data of NOZ 25-W2-E/W3-EBasic dataSupply voltage: 230 Volts; 1 ph; 50 Hz Water range: 90/70ºCMax. input power: 0.59 kW Weight: 44 kg / 46 kgMax. input current: 2.7A

tLi* speed 1 2 3 4 5 1 2 3 4 5

tapping voltage, fan V 95 115 130 155 230 95 115 130 155 230air displacement ** m3/h 1930 2410 2780 3250 3660 1790 2240 2580 3020 3400noise level at 5m dB(A) 46 52 55 58 62 46 52 55 58 62

-10°C heating capacity kW 27.4 31.2 33.8 36.9 39.3 36.5 42.1 46.0 50.6 54.3air outlet temperature °C 27.9 24.5 22.5 20.3 18.6 42.1 38.2 35.6 32.8 30.8water flow rate l/h 1208 1375 1491 1625 1733 1610 1854 2027 2230 2392water pressure loss kPa 4.9 6.1 7.0 8.2 9.2 8.5 10.9 12.7 15.1 17.0


0°C heating capacity kW 23.8 27.1 29.5 32.1 34.3 31.8 36.6 40.0 44.0 47.3air outlet temperature °C 34.2 31.2 29.3 27.4 25.9 47.0 43.5 41.2 38.7 36.9water flow rate l/h 1050 1197 1298 1416 1510 1400 1613 1764 1942 2084water pressure loss kPa 3.8 4.8 5.5 6.4 7.2 6.6 8.5 10.0 11.8 13.4

+5°C heating capacity kW 22.1 25.2 27.3 29.8 31.8 29.4 33.9 37.1 40.9 43.9air outlet temperature °C 37.3 34.5 32.7 30.9 29.5 49.4 46.1 43.9 41.6 39.8water flow rate l/h 974 1110 1204 1314 1401 1297 1495 1636 1801 1933water pressure loss kPa 3.3 4.2 4.8 5.6 6.3 5.8 7.5 8.7 10.3 11.7





NOZ 25-W2-E NOZ 25-W3-E


8


Technical data of NOZ 25-W2-DBasic dataSupply voltage: 400 Volts; 3 ph; 50 Hz Water range: 90/70ºCMax. input power: 0.54 kW Weight: 42 kgMax. input current: 1.1A

tLi* 1 2 3 4 5 1 2 3 4 5

tapping voltage, fan V 155 195 240 300 400 155 195 240 300 400air displacement ** m3/h 1150 1440 1760 2210 2770 1940 2400 2810 3280 3680noise level at 5 m dB(A) 33 38 43 49 54 45 50 55 59 61








+20°C heating capacity kW 12.3 14.2 16.1 18.5 21.0 17.1 19.4 21.2 23.1 24.6air outlet temperature °C 51.8 49.4 47.2 44.8 42.6 46.2 44.0 42.4 40.9 39.9water flow rate l/h 543 627 710 814 927 753 854 935 1019 1085water pressure loss kpa 1.2 1.5 1.9 2.4 3.1 2.1 2.6 3.1 3.6 4.0

Speed (Y-connection) Speed (∆-connection)


9


Technical data of NOZ 25-W3-DBasic dataSupply voltage: 400 Volts; 3 ph; 50 Hz Water range: 90/70ºCMax. input power: 0.54 kW Weight: 44 kgMax. input current: 1.1A

tLi* 1 2 3 4 5 1 2 3 4 5

tapping voltage, fan V 155 195 240 300 400 155 195 240 300 400air displacement ** m3/h 1060 1330 1630 2050 2570 1800 2230 2610 3050 3420noise level at 5 m dBA 33 38 43 49 54 45 50 55 58 61











10


Technical data of NOZ 50-W2-DBasic dataSupply voltage: 400 Volts; 3 ph; 50 Hz Water range: 90/70ºCMax. input power: 1.35 kW Weight: 69 kgMax. input current: 2.4 A

tLi* 1 2 3 4 5 1 2 3 4 5












11


Technical data of NOZ 50-W3-DBasic dataSupply voltage: 400 Volts; 3 ph; 50 Hz Water range: 90/70ºCMax. input power: 1.35 kW Weight: 75 kgMax. input current: 2.4 A

tLi* 1 2 3 4 5 1 2 3 4 5












Heating capacity different water temperatures.

12

Explanation of technical data

Heating capacity

The heating capacities stated in the tables on pages 7 to 11 are based on awater temperature range of 90/70°C and an air inlet temperature of 15°C. If water temperatures differ, the heating capacity is to be multiplied by thecorrection factors from the table below.

Air inlet temperature

Water range -10°C -5°C 0°C +5°C +10°C +15°C +18°C +20°C

110/90 °C 1.82 1.72 1.63 1.53 1.44 1.35 1.29 1.26

100/80 °C 1.64 1.54 1.45 1.36 1.27 1.17 1.12 1.09

90/70 °C 1.46 1.37 1.27 1.18 1.09 1 0.95 0.91

80/60 °C 1.28 1.19 1.09 1.00 0.91 0.82 0.77 0.74

70/50 °C 1.09 1.00 0.91 0.82 0.73 0.65 0.60 0.56

60/40 °C 0.91 0.82 0.73 0.64 0.56 0.47 0.42 0.39

With the ventilation model, air displacement decreases (due to modules andductwork). The following guideline may be used:

• 1 module = 15 % less than the table values • 2 modules and ductwork = 20 % less than the table values

A decrease in air displacement also leads to a decrease in heating capacity.Using the formula, you may calculate the new heating capacity.

• 1 module = Qnew = 0.93 • Qtable value

• 2 modules and ductwork = Qnew = 0.90 • Qtable value

Water flow rate

The water flow rates stated in the tables on pages 7 to 11 are based on awater temperature range of 90-70°C. If water temperatures differ, the water flow rate may be roughly calculated using the below formula.Before doing so, the heating capacity must first be recalculated (see above).

If circumstances differ from thosedescribed here, such as different watertemperatures or more than one unit ina single room, please do not hesitateto ask for our advice.

mw = water flow rate [l/h]Q = heating capacity [kW] (see the above table)ρw = density of water at 90ºC (=0.984) [kg/l]

cpw = specific heat of water (=4.18)

∆Tw = water temperature differential [ºC]

kJ

kgºC

mw = • 3600 [ l /h] Q

ρw cpw ∆Tw


13

Explanation of technical data

Water pressure loss

The water pressure loss stated in the tables on pages 7 to 11 is based on awater temperature range of 90/70°C. If water temperatures differ, the waterpressure loss may be roughly calculated using the below formula. Beforedoing so, the water flow rate must first be recalculated (see page 12).

Sound

The sound data represented on pages 7 to 11 were measured at a distanceof 5 m from the unit, in a room with a reverberation time of 1.2 seconds and with a volume according to the below table. With these room volumes,the air circulation ratio in the room is 1 at fan speed 5.

Type Connection Room volume

NOZ 25-E - 3660 m3

NOZ 25-D Y 2770 m3

NOZ 25-D ∆ 3680 m3

NOZ 50-D Y 6740 m3

NOZ 50-D ∆ 8930 m3

For distances other than 5 m, the below correction factors must be appliedto the sound pressure values stated in the tables on pages 7 to 11.

Correction factors for sound pressure level, in dB(A) (for all fan speeds)

Distance

Type Connection 3 m 4 m 5 m 6 m 8 m 10 m

NOZ 25-E - +1.7 +0.6 0 -0.4 -0.9 -1.1

NOZ 25-D Y +1.5 +0.6 0 -0.3 -0.6 -0.8

NOZ 25-D ∆ +1.8 +0.7 0 -0.4 -0.8 -1.0

NOZ 50-D Y +2.5 +1.0 0 -0.5 -1.2 -1.6

NOZ 50-D ∆ +2.7 +1.1 0 -0.7 -1.5 -1.9

∆ pw2= water pressure loss

∆ pw1= water pressure loss, table values

mw1 = water flow rate, table values

mw2 = water flow ratem calculated using formula on pag. 12

∆pw2=∆pw1

• mw1(mw2)

2


14

Dimensional sketches, model NOZ

Type A B C D E F G H J K L

NOZ 25 750 710 640 550 512 G3/4” 200 615 190 400 810

NOZ 50 975 935 865 775 738 G 1” 300 771 246 500 1015

D internal

C

B

A

175

sleeve swivelPG 16

50

B C

20

55 20

M8 (4x) 55

return supply

ø9,5 (4x)

119 119 46 11

3073

female thread (2x) see F

G min.

25

J

H

K

53º

ø max. L

13º

33º

E


15

Dimensional sketches, ventilation model NOZ

Type A B C D E F G H (1-way) H (3-way) J K

NOZ 25 1406 746 295 575 565 557 604 176 376 248 615

NOZ 50 1871 971 415 800 790 782 829 176 556 248 771

ventilation/recirculation

ventilation


NO

Z-E

NG

-200

4-04

•247

256

Specifications

Casing

The casing is made of zinc plated sheet steel, extra strengthened to minimisevibration, and it has an inspection panel in the side. The casing and guard grillecome, as a standard, in the colour RAL 9018 (light grey), the inspection paneland the plastic rings in RAL 5010 (blue). The nozzles are made of natural alu-minium. Other RAL colours are available at an extra charge.

Heating battery

The 2- or 3-row heating battery is made up of 3/8” copper pipes and aluminium fins. The water connections for the NOZ 25 are G

3/4” and for

the NOZ 50 G1”. These connections (internally secured against torsion) are located in the side of the unit.

Test pressure : 30 bar Max. operating pressure : 16 bar at 120°C

Motor / Fan assembly

The diagonal fan is made up of an aluminium impeller and an external rotormotor. The fan speed can be controlled by varying the supply voltage. The motor is according to DIN 40050, belongs to protection class IP 54 and meets the standard DIN VDE 0530. Insulation class: B.

If overheated, the motor is protected by thermal contacts, which will breakthe electric circuit.

Thermostat with frost protection

The air heater may be fitted with a built-in thermostat with frost protection.At temperatures below 6°C, the thermostat will send out a signal to thevalve motor.

Electric connection

The feeder cable may be connectedto the isolation switch (of protectionclass IP 21), which is built in as astandard.

Biddle bvP.O. Box 15NL-9288 ZG KootstertilleThe Netherlandstel. +31 512 33 55 55fax +31 512 33 55 54e-mail [email protected] www.biddle.info

Subject to change.

16

Standard isolation switch


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