Type DID632

Active chilled beam with two-way air discharge and horizontal heat exchanger, suitable for grid ceilings with grid size 600 or 625

Active chilled beam for heating and cooling, with 2-pipe or 4-pipe heat exchanger, for integration with various ceiling systems

  • Preferably for room heights up to 4.0 m
  • High heating and cooling capacity with a low conditioned primary air volume flow rate and low sound power level
  • Four nozzle variants to optimise induction based on demand
  • Hinged, removable induced air grille in four designs


Optional equipment and accessories

  • Control system
  • Additional casing for extract air
  • Heat exchanger powder-coated black
  • Powder coating in many different colours, e.g. RAL CLASSIC
  • Adjustable air control blades for air direction control
  • With an extended border also suitable for freely suspended installation

DID632-LR-4-M-LL 00191994_0


  • Application
  • Description

Application

  • Active chilled beams of Type DID632 for the integration into various ceiling systems, preferably for room heights up to 4.0 m
  • Particularly suitable for grid ceilings with grid size 600 or 625
  • Adjustable air control blades (optional) allow for the manual adjustment of the air discharge direction
  • 2-pipe or 4-pipe heat exchangers enable good comfort levels with a low conditioned primary air volume flow rate
  • Energy-efficient solution since water is used for heating and cooling

Special characteristics

  • Adjustable air control blades for air direction control
  • Hinged, removable induced air grille in four designs
  • Horizontal heat exchanger as 2-pipe or 4-pipe system
  • Internal nozzle plate with punched nozzles (non-combustible)
  • Water connections at the narrow side, Ø12 mm Cu pipe, either with plain tails or with G½" external thread and flat seal

Nominal sizes

  • 900, 1200, 1500, 1800, 2100, 2400, 2700, 3000 mm

Variants

  • DID632-LR: With induced air grille – perforated sheet metal, circular holes
  • DID632-LQ: With induced air grille – perforated sheet metal, square holes
  • DID632-GL: With induced air grille – longitudinal blades
  • DID632-GQ: With induced air grille – transverse blades


Heat exchanger

  • 2: 2-pipe systems
  • 4: 4-pipe systems


Nozzle variants

  • Z: Small plus
  • M: Medium
  • G: Large
  • U: Extra large

Construction

  • Powder-coated RAL 9010, pure white, gloss level 50 %
  • P1: Powder-coated in any other RAL colour, gloss level 70 %
  • P1: Powder-coated RAL 9006, white aluminium, gloss level 30 %

Attachments

  • Additional casing with extract air spigot (45° connection)
  • Water connection A1: G½" external thread and flat seal
  • Water connection A2: G½" union nut and flat seal
  • Adjustable air control blades for air direction control

Useful additions

  • Connecting hoses
  • Control equipment consisting of a control panel including a controller with integral room temperature sensor; valves and valve actuators; and lockshields
  • X-AIRCONTROL control system

Construction features

  • Spigot is suitable for circular ducts to EN 1506 or EN 13180
  • Four suspension points for on-site installation (by others)
  • Four nozzle variants to optimise induction based on demand
  • Optional additional casing with extract air spigot (45° connection)
  • Optional adjustable air control blades for air direction control (retrofit at a later stage is not possible)

Materials and surfaces

  • Casing, front frame, nozzle plate, and perforated induced air grille (LR/LQ) made of galvanised sheet steel
  • Blades of the induced air grille (GL/GQ) made of aluminium sections
  • Heat exchanger with copper tubes and aluminium fins
  • Exposed surfaces are powder-coated pure white (RAL 9010) or in any other RAL colour
  • Heat exchanger also in black (RAL 9005)
  • Additional casing with extract air spigot made of galvanised sheet steel
  • Air control blades made of polypropylene, UL 94, flame retardant (V0)

Standards and guidelines

  • Products are certified by Eurovent (no. 09.12.432) and listed on the Eurovent website
  • Declaration of hygiene conformity to VDI 6022

Maintenance

  • No moving parts, hence low maintenance
  • The heat exchanger can be vacuumed with an industrial vacuum cleaner if necessary
  • VDI 6022, Part 1, applies (Hygiene requirements for ventilation and air-conditioning systems and units)

Technical information

Function, Technical data, Quick sizing, Specification text, Order code, Related products

  • Function
  • Technical data
  • Quick sizing
  • Specification text
  • Order code

Functional description

Active chilled beams provide centrally conditioned primary air (fresh air) to the room and use heat exchangers for additional cooling and/or heating.

The primary air is discharged through nozzles (in 4 sizes) into the mixing chambers; as a result of this, secondary air is induced. Secondary air (room air) is induced via the induced air grille and passes through the horizontal heat exchanger, where it is heated or cooled.

Primary and secondary air mix and are then supplied to the room horizontally through the supply air slots.

Nominal length

900, 1200, 1500, 1800, 2100, 2400, 2700, 3000 mm

Length

893 – 3000 mm

Height

210 mm

Width

593, 598, 618, 623 mm

Primary air spigot, diameter

123/158 mm

Primary air volume flow rate

6 – 85 l/s or 22 – 306 m³/h

Cooling capacity

Up to 2450 W

Heating capacity

Up to 2970 W

Max. operating pressure, water side

6 bar

Max. operating temperature

75 °C


The quick sizing table contains operating points for defined reference units. For other operating points you may use the Easy Product Finder design software.

Quick sizing

LN Primary air Cooling mode Heating mode
LN VPr Δpt LWA 2-pipe and 4-pipe systems 4-pipe system
LN VPr Δpt LWA Qtot QWK ΔtW ΔpW QWH = Qtot ΔtW ΔpW
LN l/s m³/h Pa dB(A) W K kPa W K kPa

900

Z

6

22

67

<20

411

339

2.6

2.4

495

8.5

0.2

900

Z

9

32

151

<20

573

464

3.6

2.4

673

11.6

0.2

900

Z

12

43

268

22

690

545

4.3

2.4

786

13.5

0.2

900

M

9

32

65

<20

459

350

2.7

2.4

512

8.8

0.2

900

M

13

47

136

<20

628

472

3.7

2.4

683

11.7

0.2

900

M

18

65

260

28

785

568

4.4

2.4

818

14.1

0.2

900

G

16

58

58

<20

590

397

3.1

2.4

577

9.9

0.2

900

G

24

86

129

29

815

526

4.1

2.4

759

13.1

0.2

900

G

34

122

259

38

1035

625

4.9

2.4

897

15.4

0.2

900

U

30

108

65

30

847

485

3.8

2.4

702

12.1

0.2

900

U

36

130

94

35

964

530

4.1

2.4

764

13.1

0.2

900

U

44

158

140

40

1107

577

4.5

2.4

829

14.3

0.2

1200

Z

8

29

64

<20

529

433

3.4

3.1

628

10.8

0.3

1200

Z

12

43

145

<20

728

584

4.6

3.1

839

14.4

0.3

1200

Z

16

58

257

26

871

679

5.3

3.1

970

16.7

0.3

1200

M

12

43

63

<20

592

447

3.5

3.1

648

11.2

0.3

1200

M

17

61

126

23

790

585

4.6

3.1

841

14.5

0.3

1200

M

24

86

250

32

995

705

5.5

3.1

1006

17.3

0.3

1200

G

21

76

59

22

750

496

3.9

3.1

718

12.3

0.3

1200

G

32

115

126

34

1042

656

5.1

3.1

939

16.2

0.3

1200

G

44

158

238

42

1292

762

6.0

3.1

1083

18.6

0.3

1200

U

36

130

54

33

1011

577

4.5

3.1

830

14.3

0.3

1200

U

42

151

73

37

1129

623

4.9

3.1

893

15.4

0.3

1200

U

48

173

95

41

1240

661

5.2

3.1

945

16.3

0.3

1500

Z

10

36

63

<20

639

519

4.1

3.7

749

12.9

0.3

1500

Z

15

54

141

21

871

690

5.4

3.7

986

17.0

0.3

1500

Z

20

72

251

29

1037

795

6.2

3.7

1128

19.4

0.3

1500

M

15

54

62

<20

716

535

4.2

3.7

772

13.3

0.3

1500

M

20

72

109

25

908

666

5.2

3.7

953

16.4

0.3

1500

M

30

108

243

36

1187

825

6.4

3.7

1168

20.1

0.3

1500

G

30

108

71

30

1014

652

5.1

3.7

934

16.1

0.3

1500

G

38

137

114

36

1209

751

5.9

3.7

1068

18.4

0.3

1500

G

44

158

153

40

1338

807

6.3

3.7

1144

19.7

0.3

1500

U

42

151

49

37

1166

659

5.2

3.7

943

16.2

0.3

1500

U

46

166

59

40

1245

691

5.4

3.7

986

17.0

0.3

1500

U

50

180

70

42

1321

718

5.6

3.7

1024

17.6

0.3

1800

Z

12

43

62

<20

743

598

4.7

4.3

859

14.8

0.3

1800

Z

18

65

139

24

1003

786

6.1

4.3

1115

19.2

0.3

1800

Z

24

86

247

32

1188

899

7.0

4.3

1266

21.8

0.3

1800

M

18

65

61

<20

834

617

4.8

4.3

884

15.2

0.3

1800

M

24

86

108

28

1050

760

5.9

4.3

1080

18.6

0.3

1800

M

36

130

243

39

1364

930

7.3

4.3

1307

22.5

0.3

1800

G

30

108

50

29

1015

653

5.1

4.3

935

16.1

0.3

1800

G

40

144

89

37

1276

794

6.2

4.3

1126

19.4

0.3

1800

G

44

158

107

39

1367

836

6.5

4.3

1182

20.3

0.3

1800

U

40

144

33

37

1143

661

5.2

4.3

945

16.3

0.3

1800

U

44

158

40

40

1230

700

5.5

4.3

998

17.2

0.3

1800

U

50

180

52

43

1352

749

5.9

4.3

1066

18.3

0.3

2100

Z

14

50

61

<20

994

825

3.5

14.2

1506

11.8

1.6

2100

Z

21

76

137

22

1363

1110

4.8

14.2

1997

15.6

1.6

2100

Z

28

101

243

30

1625

1287

5.5

14.2

2297

18.0

1.6

2100

M

21

76

59

<20

1106

852

3.7

14.2

1553

12.1

1.6

2100

M

28

101

105

25

1408

1070

4.6

14.2

1929

15.1

1.6

2100

M

42

151

237

36

1844

1337

5.8

14.2

2381

18.6

1.6

2100

G

36

130

50

26

1364

930

4.0

14.2

1688

13.2

1.6

2100

G

56

202

120

38

1921

1246

5.4

14.2

2228

17.4

1.6

2100

G

70

252

188

44

2230

1386

6.0

14.2

2462

19.2

1.6

2100

U

60

216

47

37

1793

1070

4.6

14.2

1929

15.1

1.6

2100

U

70

252

64

41

2001

1157

5.0

14.2

2077

16.2

1.6

2100

U

80

288

84

45

2193

1229

5.3

14.2

2199

17.2

1.6

2400

Z

16

58

61

< 20

1113

920

4.0

15.9

1671

13.1

1.8

2400

Z

24

86

136

24

1516

1226

5.3

15.9

2195

17.2

1.8

2400

Z

32

115

241

32

1801

1415

6.1

15.9

2510

19.6

1.8

2400

M

24

86

59

<20

1239

949

4.1

15.9

1722

13.5

1.8

2400

M

32

115

105

27

1570

1184

5.1

15.9

2123

16.6

1.8

2400

M

48

173

236

38

2047

1468

6.3

15.9

2598

20.3

1.8

2400

G

40

144

48

28

1491

1009

4.3

15.9

1825

14.3

1.8

2400

G

60

216

107

39

2049

1326

5.7

15.9

2362

18.5

1.8

2400

G

70

252

145

43

2276

1432

6.2

15.9

2539

19.9

1.8

2400

U

60

216

38

37

1823

1099

4.7

15.9

1979

15.5

1.8

2400

U

70

252

51

41

2040

1196

5.1

15.9

2144

16.8

1.8

2400

U

80

288

67

45

2241

1277

5.5

15.9

2279

17.8

1.8

2700

Z

18

65

60

<20

1227

1010

4.3

17.7

1826

14.3

2.0

2700

Z

27

97

135

26

1661

1336

5.7

17.7

2378

18.6

2.0

2700

Z

36

130

240

34

1968

1534

6.6

17.7

2706

21.2

2.0

2700

M

27

97

59

22

1367

1041

4.5

17.7

1880

14.7

2.0

2700

M

36

130

105

30

1725

1291

5.6

17.7

2303

18.0

2.0

2700

M

54

194

235

40

2240

1589

6.8

17.7

2796

21.9

2.0

2700

G

45

162

48

29

1648

1105

4.8

17.7

1989

15.6

2.0

2700

G

60

216

85

38

2073

1350

5.8

17.7

2402

18.8

2.0

2700

G

70

252

116

42

2311

1467

6.3

17.7

2597

20.3

2.0

2700

U

62

223

33

38

1889

1141

4.9

17.7

2051

16.0

2.0

2700

U

73

263

46

43

2134

1254

5.4

17.7

2242

17.5

2.0

2700

U

84

302

61

46

2358

1345

5.8

17.7

2395

18.7

2.0

3000

Z

20

72

60

<20

1337

1096

4.7

19.4

1973

15.4

2.1

3000

Z

30

108

135

28

1800

1438

6.2

19.4

2549

19.9

2.1

3000

Z

40

144

239

36

2126

1644

7.1

19.4

2885

22.6

2.1

3000

M

30

108

59

23

1491

1129

4.9

19.4

2030

15.9

2.1

3000

M

40

144

105

31

1874

1391

6.0

19.4

2471

19.3

2.1

3000

M

60

216

235

42

2424

1701

7.3

19.4

2977

23.3

2.1

3000

G

50

180

49

32

1799

1196

5.1

19.4

2144

16.8

2.1

3000

G

65

234

82

39

2216

1432

6.2

19.4

2538

19.8

2.1

3000

G

75

270

109

43

2451

1547

6.7

19.4

2728

21.3

2.1

3000

U

65

234

31

40

1974

1190

5.1

19.4

2134

16.7

2.1

3000

U

75

270

41

44

2202

1297

5.6

19.4

2314

18.1

2.1

3000

U

85

306

53

47

2410

1385

6.0

19.4

2461

19.2

2.1

¹ If the air discharge is not straight, the water-side capacity will be slightly affected; blades set at 45° may cause a loss of up to 5 %.

① Nozzle variant ② Pressure drop ③ Air-regenerated noise


Reference values

Parameter Cooling Heating

tR

26 °C

22 °C

tPr

16 °C

22 °C (isothermal)

tWV

16 °C

50 °C

VW (LN 900 – 1800 mm)

110 l/h

50 l/h

VW (LN from 2100 mm)

200 l/h

110 l/h


Aerodynamic data – extract air

Aerodynamic data – extract air Aerodynamic data – extract air
VExt VExt Δpt LWA
l/s m³/h Pa dB(A)

12

43

0.5

<15

18

65

1.0

<15

24

86

1.9

<15

30

108

2.9

<15

35

126

3.9

<15

40

144

5.1

<15

50

180

8.0

20

60

216

11.6

26

70

252

15.7

30

80

288

20.6

34


Active chilled beams of Type DID632, with two-way air discharge and high thermal output, providing high thermal comfort levels.

For installation flush with the ceiling, preferably in rooms with a height up to 4.0 m.

The units consist of a casing with suspension points, a spigot, non-combustible nozzles, and a horizontal heat exchanger.

Nozzles in four sizes to optimise induction based on demand.

Special characteristics

  • Adjustable air control blades for air direction control
  • Hinged, removable induced air grille in four designs
  • Horizontal heat exchanger as 2-pipe or 4-pipe system
  • Internal nozzle plate with punched nozzles (non-combustible)
  • Water connections at the narrow side, Ø12 mm Cu pipe, either with plain tails or with G½" external thread and flat seal

Materials and surfaces

  • Casing, front frame, nozzle plate, and perforated induced air grille (LR/LQ) made of galvanised sheet steel
  • Blades of the induced air grille (GL/GQ) made of aluminium sections
  • Heat exchanger with copper tubes and aluminium fins
  • Exposed surfaces are powder-coated pure white (RAL 9010) or in any other RAL colour
  • Heat exchanger also in black (RAL 9005)
  • Additional casing with extract air spigot made of galvanised sheet steel
  • Air control blades made of polypropylene, UL 94, flame retardant (V0)

Construction

  • Powder-coated RAL 9010, pure white, gloss level 50 %
  • P1: Powder-coated in any other RAL colour, gloss level 70 %
  • P1: Powder-coated RAL 9006, white aluminium, gloss level 30 %

Technical data

  • Nominal length: 900, 1200, 1500, 1800, 2100, 2400, 2700, 3000 mm
  • Length: 893 – 3000 mm
  • Height: 210 mm
  • Width: 593, 598, 618, 623 mm
  • Primary air spigot, diameter: 123/158 mm
  • Primary air volume flow rate: 6 – 85 l/s or 22 – 306 m³/h
  • Cooling capacity: up to 2450 W
  • Heating capacity: up to 2970 W
  • Max. operating pressure: 6 bar
  • Max. operating temperature: 75 °C

Sizing data

Primary air

  • V _______________________ [m³/h]
  • Δpt _______________________ [Pa]

Air-regenerated noise

  • LWA _______________________ [dB(A)]

Cooling

  • Qges _______________________ [W]

Heating

  • Qges _______________________ [W]

This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.

00135559_0

 Type
DID632       Active chilled beam

 Induced air grille
GL       Longitudinal blades
GQ       Transverse blades
LR       Perforated metal, circular holes
LQ       Perforated metal, square holes

 Heat exchanger
2       2-pipe
4       4-pipe

 Nozzle variant
Z       Small plus
M       Medium
G       Large
U       Extra large

 Arrangement of casings and connections
LL       (also available as supply and extract air combination)
LR
ML
MR
RL
RR       (also available as supply and extract air combination)

       Note
       L = left side, R = right side, M = centre

 Additional casing with extract air spigot
       No entry: none
AV       Front
AH       Rear

       Available from L = LN + 250 mm

 Water connections
       No entry: Ø12 mm pipe with plain tails
A1       With G½" external thread and flat seal
A2       With G½" union nut and flat seal

 

 Total length (diffuser face) × nominal size [mm]
       L × LN
       Supply air
893 – 1500 × 900
1193 – 1800 × 1200
1493 – 2100 × 1500
1793 – 2400 × 1800
2093 – 2700 × 2100
2393 – 3000 × 2400
2693 – 3000 × 2700
2993 – 3000 × 3000
       L is up to 7 mm shorter than LN


       Supply and extract air combination
1150 – 1500 × 900
1450 – 1800 × 1200
1750 – 2100 × 1500
2050 – 2400 × 1800
2350 – 2700 × 2100
2650 – 3000 × 2400
2950 – 3000 × 2700

Width of front frame [mm]
       B
593
598
618
623

 Exposed surface
       No entry: powder-coated RAL 9010, pure white
P1       Powder-coated, specify RAL CLASSIC colour

       Gloss level
       RAL 9010 50 %
       RAL 9006 30 %
       All other RAL colours 70 %

 Surface of heat exchanger
       No entry: untreated
G3       RAL 9005, black

 Air control blades
       No entry: none
LE       With

 Valves and actuators
       No entry: none
VS        With

DID632–LR–2–M–LL/1193×1200×593

Induced air grille

Perforated metal, circular holes

Heat exchanger

2-pipe

Nozzle variant

Medium

Arrangement of casings and connections

Left side, left side

Total length (diffuser face) × nominal length

1193 × 1200 mm

Width of front frame

593 mm


DID632–GQ–2–U–RR–AV–A1/1798×1200×598/P1/RAL9006/G3/LE/VS

Induced air grille

Transverse blades

Heat exchanger

2-pipe

Nozzle variant

Extra large

Arrangement of casings and connections

Right side, right side

Extract air spigot

Front

Water connections

With G½" external thread and flat seal

Total length (diffuser face) × nominal length

1798 × 1500 mm

Width of front frame

598 mm

Exposed surface

RAL 9006

Surface of heat exchanger

Black

Valves and actuators

With


 

Variants, Attachments, Dimensions and weight, Supply and extract air combination

  • Variants
  • Attachments
  • Dimensions and weight
  • Supply and extract air combination

Set of air control blades

If a high cooling capacity is required in a very small space with active chilled beams, optional air control blades allow for adjusting the air discharge pattern such that the acceptable air velocity in the occupied zone is not exceeded. The airflow of each active chilled beam is spread and discharged according to the room geometry. If the use of a room changes, the air discharge pattern can be optimised by adjusting the air control blades accordingly.

  • It is possible to adjust several air control blades (i.e. a set of air control blades) together
  • For fine adjustment, the sets of air control blades can be disconnected from complementary to one another
  • To adjust a set of air control blades, use both hands to move the two outer blades of the set as required
  • Maximum possible adjustment is 45° to the right or left in steps of 15°
  • The blades are factory set to straight air discharge

If the air discharge is not straight, the water-side capacity will be slightly affected. Blades set at 45° may cause a loss of up to 5 %. Air control blades have to be factory fitted; it is not possible to retrofit air control blades at a later stage.

Dimensions [mm]

B C E

593

18

178

598

8

180

618

18

190

623

8

193

B = Width of front frame


Dimensions [mm]

LN L ØD HS G
LN L ØD HS G

900

893 – 1500

123

134

51.5

1200

1193 – 1800

123

134

51.5

1500

1493 – 2100

123

134

51.5

1800

1793 – 2400

123

134

351.5

2100

2093 – 2700

158

116

361.5

2400

2393 – 3000

158

116

451.5

2700

2693 – 3000

158

116

561.5

3000

2993 – 3000

158

116

651.5

L = Total length (diffuser face)

LN = Nominal length


Weight per unit [kg]

Nominal length (LN) 900 1200 1500 1800 2100 2400 2700 3000

DID632-LR

18

22

27

32

39

47

54

61

DID632-LQ

17

21

26

31

38

46

53

60

DID632-GL

20

25

31

36

43

52

59

67

DID632-GQ

20

25

31

36

43

52

59

67

Contained water (max.)

1.8

2.4

3

3.6

4.2

4.8

5.4

6

Non-active section as extension: 10 kg/m

Differences in width can be neglected


Dimensions [mm]

B C

593

18

598

8

618

18

623

8

B = Width of front frame


Dimensions [mm]

LN L ØD HS G
LN L ØD HS G

900

1150 – 1500

123

134

51.5

1200

1450 – 1800

123

134

51.5

1500

1750 – 2100

123

134

51.5

1800

2050 – 2400

123

134

351.5

2100

2350 – 2700

158

116

361.5

2400

2650 – 3000

158

116

451.5

2700

2950 – 3000

158

116

561.5

L = Total length (diffuser face)

LN = Nominal length


Weight per unit [kg]

Nominal length (LN) in mm 900 1200 1500 1800 2100 2400 2700 3000

DID632-LR

18

22

27

32

39

47

54

61

DID632-LQ

17

21

26

31

38

46

53

60

DID632-GL

20

25

31

36

43

52

59

67

DID632-GQ

20

25

31

36

43

52

59

67

Contained water (max.)

1.8

2.4

3

3.6

4.2

4.8

5.4

6

Non-active section as extension: 10 kg/m

Extract air spigot Ø123 mm (min. length 250 mm) 3 kg/piece

Differences in width and LE can be neglected


Installation examples, Installation details, Basic information and nomenclature

  • Installation examples
  • Installation details
  • Basic information and nomenclature

Installation and commissioning

  • Preferably for rooms with a clear height up to 4.0 m
  • Flush ceiling installation
  • Side entry primary air spigot
  • Lengths from 893 to 3000 mm, and widths of 593, 598, 618 and 623 mm, hence suitable for all ceiling systems, particularly for grid ceilings with grid size 600 or 625
  • Installation and connections to be performed by others; fixing, connection and sealing material to be provided by others
  • Active chilled beam has 4 suspension points for on-site installation (by others)
  • Heat exchangers are fitted with water flow and water return connections at the narrow side
  • With an extended border also suitable for freely suspended installation


Installation into T-bar ceilings or continuous ceilings

  • To avoid too much load on the ceiling, the suspension points should be used

LN [mm]

Nominal length

LWA [dB(A)]

Sound power level

tPr [°C]

Primary air temperature

tWV [C°]

Water flow temperature – cooling/heating

tR [C°]

Room temperature

tR [C°]

Room temperature

tAN [C°]

Secondary air intake temperature

QPr [W]

Thermal output – primary air

Qtot [W]

Thermal output – total

QW [W]

Thermal output – water side, cooling/heating

VPr [l/s]

Primary air volume flow rate

VPr [m³/h]

Primary air volume flow rate

VW [l/h]

Water flow rate – cooling/heating

V [l/h]

Volume flow rate

∆tW [K]

Temperature difference – water

∆pW [kPa]

Pressure drop, water side

∆pt [Pa]

Total pressure drop, air side

∆tPr = tPr - tR [K]

Difference between primary air temperature and room temperature

∆tRWV = tWV - tR [K]

Difference between water flow temperature and room temperature

∆tWm-Ref [K]

Difference between mean water temperature and reference temperature

LN [mm]

Nominal length

Mixed flow

The supply air is discharged from the diffuser into the space with a velocity between 2 and 5 m/s. The resulting air jet mixes with the room air, ventilating the entire space. Mixed flow systems typically provide a uniform temperature distribution and air quality within the space. The originally high velocity of the turbulent air jet decreases rapidly due to the high induction levels of mixed flow systems.

Heat exchanger

The maximum water-side operating pressure for all heat exchangers is 6 bar.

The maximum water flow temperature (heating circuit) for all heat exchangers is 75 °C; if flexible hoses are used, the water flow temperature should not exceed 55 °C. Units for other pressures and temperatures are available on request.

The water flow temperature (cooling circuit) should be at least 16 °C such that it does not permanently fall below the dew point. For units with a condensate drip tray the water flow temperature may be reduced to 15 °C.

Heat exchanger as 2-pipe system

Air-water systems with a 2-pipe heat exchanger may be used for either heating or cooling. In changeover mode it is possible to use all units within a water circuit exclusively for cooling in summer and exclusively for heating in winter.

Heat exchanger as 4-pipe system

Air-water systems with a 4-pipe heat exchanger may be used for both heating and cooling. Depending on the season, i.e. especially in spring and autumn, it may be possible that an office has to be heated in the morning and cooled in the afternoon.

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