AL-KO Prospekt Energierückgewinnung Engl

8/8/2019 AL-KO Prospekt Energierückgewinnung Engl

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HIGH PERFORMANCE-RUN-AROUND-COIL-SYSTEMENERGY RECOVERY

AIR-HANDLING-UNITS



Supporting frame for Hydraulic components Heat recovery system according to VDI 2071

Bene ts of energy recovery

The heat capacity transferred to the out-side air is not generated afresh but re-covered through heat recovery from theextract air. The use of heat recovery unitsin air-conditioning-systems results in ahigher capital investment but results inmuch lower operation costs. A feasibilitystudy determines whether the installationof a heat recovery unit is economic.

Reasons for using a heatrecovery system:I Capacity reduction for heat generationI Reduction of annual heating energy

consumptionI Capacity reduction for cooling. This

means a scaling down and saving ofinvestment in heating coils, pipelines,pumps, cooling systems, refrigerationplant, cooling towers and cooling coils.

I Reduction of the annual cooling energyconsumption, thus lower operatingcosts

I Reduction in environmental pollution

The most important heatrecovery systems

RecuperatorsThe hot and cold air- ows are directedalong common interfaces through whichthe heat is transferred.

RegeneratorsHeat and possibly humidity exchange viacontact surfaces. Hot and cold air owsphysically separated through the heatingwheel. This absorbs the heat in the ex-tract air and passes it to the supply air.

Run-around-coil-systemsThe heat recovery unit is made up of se-veral heat exchangers. The energy istransferred indirectly using heat transfer

medium via the interface between thehot air and the heat transfer mediumand the interfaces between the energyheat transfer medium and the cold air.



Run-around-coil-systems

AL-KO HEHR (High Ef cieny Heat Recovery)The AL-KO run-around-coil-systemachieves the highest possible heat re-covery values considering construc-tional criteria, like hydraulic circuit,

geometry and heat flow capacity. Thecapacity of the system can be adjustedto high demands for optimal achieve-ment of economic criteria.

In the run-around-coil-system the heatexchange elements for cooling are in-tegrated into the extract air-flow and forheating in the outside air-flow. A pipesystem connects the two coils and servesas a energy transport medium. The circu-lating water-glycol fluid removes the heatenergy from the hot extract air and trans-fers it to the cold outside air.

Heat exchangers with special

water conduit circuit

Air- ow ratio outside / exhaust

Air velocity on corrugated exchanger surface

Temperature ef ciency outside air

Inlet, fresh air

Outlet, fresh air

Inlet, exhaust air

Outlet, exhaust air

Glycol content, Antifrogen N

1 : 1

2 m/s

70 %

-12 °C / 85 % r. h.

11.8 °C / 13,2 % r. h.

22 °C / 10 % r. h.

-1.8 °C / 50 % r. h.

25 %

r.h. = relative humidity

AL-KO standard system design



System descriptionOperation of the AL-KOrun-around-coil-system I Use of high performance heat exchangers

in a multiple countercurrent circuit. Thisachieves high annual utilisation ratiosof 80 %.

I Each heat exchanger has only one modeof air-flowing through (fresh or extractair) so that germs and contaminationcannot be transferred.

I The system is used during the winterperiod to pre-heat the fresh air and inthe summer to pre-cool the fresh airthrough adiabatic cooling of the ex-tract air.

I Because of humidification of the ex-tract air during summer period the air

is cooled and the cooling transferred

to the supply air. Humidity cannot betransferred between the air-flows Be-cause the exhaust air temperature israised in the exhaust air heat exchanger,it leaves the building without moisture.

I Depending on the type of humidifier(evaporation humidifier, high pressurenebuliser, air washer) the humidifica-tion is able to use service water, demin-eralized or adul terate water.

I The AL-KO outside air heater can bedivided in accordance with VDI 6022.The defroster with wide fin spacing, in-stalled before the filter, raises the out-side air temperature sufficiently to avoidfrost formation on the filter mediumand thus ensures compliance with the

relative humidity required by VDI 6022.

ETA

SUP

EHA

ODA

Hybrid humidier

DVE

performancecontrol

pump-hot-water 50/30

HydraulicModul

pump-hot-water 50/30

SN

MID

ZL

VE

PTH

M

M

M

5 2 4 3 2

I For dehumidifying an additional heatrecovery system exchanger is installedafter the dehumidifying cooler. Duringdehumidifying operation the energy me-dium will first be directed over the heatrecovery reheater to raise the supply airtemperature. The thereby reduced watertemperature considerably reduces theoutlet temperature at the heat recoverycoil. This system circuit saves approxi-mately 20 % cooling capacity.



HEHR run-around-coil-system designI The division in to separate self-sufficient

systems ensures a very high operation-al safety and optimal energy transfer.The heat transfer medium impingesdirectly on the heater and cooler. Thisdesign removes the need for an inter-mediate medium and additional medi-um pumps.

I All hydraulic components needed forthe operation are contained on a sup-porting frame.

I Cooler and heater are tubed and con-nected in accordance with provenlayouts.

I This energy transfer concept is instal-led at the factory and piped togetheron site by customer installers. There isno requirement for factory specialists

for this system. The same applies forservicing and maintenance. All heat ex-changers can be high-pressure cleanedup to the core.

I The excellent performance values of theAL-KO-systems result in a short amor-tisation period.

Heat exchangers: The standardised AL-KO heat exchangersconsist as standard of copper tubes withexpanded aluminium fins and stainlesssteel frame. For increased requirementsthe multifarious material combinationsare further enhanced by high quality coat-ings from two component epoxy resinor polyamide. The heat exchangers aredesigned around the principle of multiplecountercurrents. The heat exchangerscan be completely drained and vented



AL-KO THERM GmbHHauptstraße 248-25089343 Jettingen-Scheppach

Phone (+49) 8225 / 39- 269Fax (+49) 8225 / 39- 271E-Mail [email protected]

AL-KO Air-Technology – extract of referencesProject SUP total

m3 / hETA total

m3 /hNumberof units

Heatrecovery

Energyrecovery

Re-heatingduring

summ timevia energyrecovery

Run-around-

coil-system

Adiabatichumidi-

fyingof ETA

Hybridhumidi-

fyingof ETA

Aircabin Laupheim 382 000 382 000 6 + 6 X XBio Centrum Köln 264 000 220 800 6 + 9 X XBöhringer Ingelheim 27 500 27 500 1 + 1 XCreavis Marl I. BA 58 300 51 450 5 + 4 X X XCreavis Marl II. BA 59 500 45 500 6 + 5 X XDiakonie Bremen 38 000 38 000 1 + 3 X X XEhrmann Moskau 50 000 50 000 1 + 1 XFHG IZI Labore Leipzig 9 000 9 000 2 + 2 X XFranziskus Stif t Lohne 35 000 35 000 1 + 1 XFraunhofer Erlangen II. BA 52 650 52 650 6 + 6 XFraunhofer ITEM Hannover 83 000 71 700 1 + 2 X X XMain Station Dresden 43 150 44 120 3 + 3 XHeiligenhafen 21 080 21 080 2 + 2 X

IFOK Rostock 64 000 64 000 4 + 4 XJogu Mainz lecture rooms 26 315 19 425 1 + 1 XClinic Siloah 10 600 10 850 1 + 1 XMaritim Hotel Berlin 10 600 10 600 1 + 1 XCoiseum Heilgenhafen 10 000 10 000 XPTB Braunschweig 30 000 30 000 1 + 1 X XRehab Kirchberg Luxembourg 129 200 129 200 9 + 9 XResidenztheatre München 9 000 8 500 1 + 2 X XRietberg museum Schweiz 20 000 1 XSchülke & Mayr 35 000 38 000 1 + 1 X XTechnic centre Warnemünde 29 275 29 590 1 + 1 XTIH Hannover 23 000 23 000 1 + 1 X XKöln university facilities 254 000 250 000 2 + 7 X X

ERG: Energy recovery (heating, cooling)Run-around-coil-system: Several air-handling-units connected

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AL-KO Prospekt Energierückgewinnung Engl