Rotary heat exchangers

031203

Auckland (Head Office) Christchurch 31 Station Road, Penrose, Auckland, NZ Level 3, 161 Kilmore Street, Christchurch, NZ PO Box 12021, Penrose, Auckland 1135 PO Box 17709, Sumner, Christchurch 8008 Ph: +64-9-579 2185 Fax: +64-9-579 2181 Ph: +64-3-379 7884 Fax: +64-3-379 7874

Web: www.cookeindustries.co.nz Email: sales@cookeindustries.co.nz

1

Among the available energy recoverysystems, the rotary heat exchangersensure the best efficiency, ranging from60% to 90%, depending upon operatingconditions. This because of their verylarge exchange surface in proportion totheir volume.The installed power of a plant isconsiderably reduced with the highefficiency of the rotary heat exchangersand with the possibility of recoveringthe humidity as well as the heat(hygroscopic wheel).In addition, the possibility of recoveringhumidity enables the humidifiers effectto be reduced.

The chief component of the machine isits wheel. Available in variousmaterials, this usually consists ofaluminium sheets, which are alternatelyflat and corrugated. The result of this isthat a series of passages is createdthrough which the two air-flows move inopposite directions.

The Working PrincipleIn rotary heat exchangers, thermalexchange takes place through theaccumulation of heat in the wheel; thus,while the rotor rotates slowly, theexhaust air moves across half of theunit and transfers heat to the matrix ofthe wheel, which accumulates it.Supply air crossing the other halfabsorbs the heat accumulated.Continuing rotation the parts thatabsorb and impart heat invert, so thisprocess can go on indefinitely.

Introduction

EXHAUST

SUPPLY

2

Vertical and horizontal positionensures maximum fitting flexibility forinstallation in the ducts or in the airhandling units.

Low leakage between the two air-streamsensured by the use of brushes made ofsynthetic fibre, mounted on theperimeter of the wheel and on thecasing.

Variety of MaterialThe wheel is made of aluminiumsheeting and pre-painted aluminium(epoxy coated); for the materials thestandard hygroscopic version, the high-efficiency hygroscopic type, and theversion for protection against a marineenvironment are available, inaccordance with the table on Page 5.

Wide Range of ModelsThe dimensions of the complete heatexchanger range from 600 mm up to2500 mm, in 100 mm steps, thuscatering for applications with aircapacities of up to about 44,000 m3/h.

Drive equipmentAvailable for operation at constantspeed or else variable speed, with aspeed controller – see Page 9.

Purging sectorThis enables the wheel to be kept cleancontinuously, by using a small amountof supply clean air. During rotation, theexhaust air soils the wheel and mightcontaminate the fresh air after half arotation. To eliminate this, the heatexchanger is provided with a purgingsector on the supply air input side,downstream of the wheel, at the pointat which the wheel shifts from expulsionon to input. The purging sector has tobe positioned in such a way that thepressure of the new air is higher thanthat of the air expelled. Thus a certainamount of new air can be transferred tothe exhaust ducts, making it possible toclean the wheel itself.

Positioning8 different configurations are available(for both vertical and horizontalinstallation) for positioning the motorand the direction of the air-flows (seePage 9).

SpacingChanging the well height of the sheetsof corrugated aluminium three differentdensities for the wheel are created.

Temperature RangeDepending on the models, themaximum limit ranges from 70°C to100°C.

Wheel Options- Wheel with increased thickness- Wheel with reduced depth- Wheel divided into sections

Frame Options- Frame with side panels- Frame with special dimensions

adaptable to existing plant

Main FeaturesPurging Sector

3

AL = MaterialAL: aluminiumAC: pre-painted aluminium

x = Commercial group

07 = Modelfrom 06 to 25

N = Temperature rangeN: 70°CD: 100°C

AT TC ... = OptionsMaterialAT: hygroscopic treatmentAR: hygroscopic treatment, high efficiencyAS: protective treatment for marine environment

WheelXS: wheel with increased thicknessXP: wheel with reduced depth (100 mm)XD: wheel divided into sections

CasingTC: casing with panelsTS: casing with special dimensionsTN: without casing (wheel only)

T = Series M = Well heightC: close well heightM: medium well heightL: large well height

K = Drive equipmentK: constant speed, 400 V motorT: constant speed, 400 V motor with thermal contactV: 230 V motor with thermal contact for speed controllerR: variable speed, 230 V motor and speed controller

v = Installationv: verticalh: horizontal

3 = Positioning1, 2, 3, 4, 5, 6, 7, 8 (see Page 9)

Product code

Tx AL 07 N v3 M K AT TC…

4

Modelsfrom 06 to 10 from 11 to 15 from 16 to 25

ATARASXSXPXDTCTSTN

Material

Wheel

Casing

* The standard casing consists of sections in galvanized sheeting, without side panels. Suitable for insertion inside air handlingunits.

Material Wheel

Options

ATHygroscopic treatmentWheel with absorbent matrix inaluminium alloy, coated in inorganicnon-crystalline hygroscopic materialfor transferring latent heat. Max. operating temperature: 70°C

ARHigh-efficiency hygroscopictreatmentWheel with absorbent matrix inaluminium alloy, coated in specialhygroscopic material for enhancedtransfer of latent heat.Max. operating temperature 70°C

ASTreatment for marine environmentWheel made of aluminium salt proofalloy. Resistant to saline atmosphereMax. operating temperature: 100°C

XSIncreased thicknessWheel made in various versions asregards material, with sheeting 0.10mm thick. Suitable for applicationsinvolving high differential pressure.

XPReduced depthWheel made in various versions asregards material, with a reduceddepth of 100 mm. Suitable forapplications calling for very lowpressure drop.

XDDivision into sectionsWheel made in various versions asregards material, in sectorizedsections. Suitable for specialapplications such as replacement ofold wheels in confined space,transport problems, etc.

Casing*TCSide panelsCasing made with sections and sidepanels in galvanized sheeting. Frontpanel is dismantleable. Suitable forducts installation or to replace themodule of the air handling unit.

TSSpecial dimensionsFor the standard version and for theone with side panels (TC), the heightof the frame can be varied (heightH), depending on the customer'srequirements.

TNWheel onlyOnly the wheel is available, with allthe options provided for in thiscatalogue.

5

AT

AL

AC

ARAS XS

The following table shows the possible combinations with the various materials and their options; for example, a rotary heatexchanger may be made of pre-painted aluminium [AC] with only the hygroscopic treatment [AT], or else with the sametreatment and sheeting of increased thickness [XS]. Obviously, the basic versions [AL or AC], can be made without treatmentsor options.

Materials

ALStandard aluminiumWheel in aluminium alloyMax. operating temperature: 70°CStandard depth: 200 mm

ACCoated aluminiumWheel made of aluminium alloy, coated with anti-corrosion paint.Max. operating temperature: 100°CStandard depth: 200 mm

Air flow m m3/h

Efficiency (%)

6

Ø mm

The following table is for rapid selection of the required heat exchanger.

The above performance figures may be considered broadly indicative and may vary, depending on working conditions. For acorrect technical assessment, Recuperator provides you with the REX computer program. Upon request, a program (DLL), forincorporation in that of the air handling unit manufacturers, is also available.

Model

8077,7

15068,6

25059,7

0607080910111213141516171819202122232425

500600700800900

100011001200130014001500160017001800190020002100220023002400

600700800900

1000110012001300140015001600170018001900200021002200230024002500

7001000140018002300280034004000470055006200700080009000102001130012500139001510016500

120017502400310040004900600071008300960011100126001420016000177001960021600240002600028500

190027503750485062507700930011000130001500017300197002220025000276003050033500370004050044000

H=A mm

Selection

Pressure drop (Pa)

7

Standard version, frame in galvanized steel.

ø

HD

A

C

B

C

General tolerances in accordance with UNI ISO 2768 – c.

Dimensions

Model0607080910111213141516171819202122232425

Ømm500600700800900

100011001200130014001500160017001800190020002100220023002400

Amm600700800900

1000110012001300140015001600170018001900200021002200230024002500

Hmm6007008009001000110012001300140015001600170018001900200021002200230024002500

Bmm290290290290290290290290290290290290290290290290290290290290

Cmm3030303030303030303030303030303030303030

Dmm6060100100100100100100100100100606060606060606060

Weightkg26344352637589104114135152170191212233255278303328355

8

ø

H

D

A

C

B

C

Model0607080910111213141516171819202122232425

Ømm500600700800900

100011001200130014001500160017001800190020002100220023002400

Amm640740840940

1040118012801380148015801680178018801980208022202320242025202620

Hmm6407408409401040118012801380148015801680178018801980208022202320242025202620

Bmm390390390390390390390390390390390390390390390430430430430430

Cmm3030303050505050505050505050507070707070

Dmm5050505050505050505050707070707070707070

Weightkg4656677992108123140156174192212234255277303328352378405

DimensionsVersion with side panels (option TC), frame in galvanized steel.The frame can be supplied complete or in two sections.

General tolerances in accordance with UNI ISO 2768 – c.

9

Drive equipmentWe now give a table summarizing the features of the used motors, depending on the type of drive. The diagrams forconnecting up the motors and the speed controller are to be found inside the assembly manual supplied together with theexchangers, with instructions for use and maintenance.

Positioning

Variable-speed drive Constant-speed driveØ wheel (mm)

Voltage (V)Frequency (Hz)

Power (kW)Current (A)

500-1000230

50/600,0250,24

1001-1400230

50/600,090,70

1401-2300230

50/600,180,99

2301-2400230

50/600,371,82

500-1000400

50/600,0250,24

1001-1100400

50/600,09

0,70/0,40

1101-1600400

50/600,18

0,99/0,57

1601-2400400

50/600,37

1,82/1,05

h5 h6 h7 h8

h1 h2 h3 h4

v6 v8v5 v7

v1 v2 v3 v4

Supply air Positioning of motor Purging sectorExhaust air Direction of rotation

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