09-092 al-ko prospekt energierückg 6s eng-01

8/9/2019 09-092 AL-KO Prospekt Energierückg 6S Eng-01

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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

Benets of energy recovery

The heat capacity transferred to the

outside air is not generated afresh but

recovered through heat recovery from

the extract air. The use of heat recovery

units in air conditioning systems results

in a higher capital investment but

results in much lower operation costs.

A feasibility study determines whether

the installation of a heat recovery unit

is economic.

Reasons for using a heat

recovery system:

I Capacity reduction for heat generation.

I Reduction of annual heating energy

consumption.

I Capacity reduction for cooling.

This means a scaling down and

saving of investment in heating coils,

pipelines, pumps, cooling systems,

refrigeration plant, cooling towers

and cooling coils.

I Reduction of the annual cooling

energy consumption, thus lower

operating costs.

I Reduction in environmental pollution.

The most important heat

recovery systems

Recuperators

The hot and cold airows are directed

along common interfaces through which

the heat is transferred.

Regenerators

Heat and possibly humidity exchange

via contact surfaces. Hot and cold air

ows physically separated through the

heating wheel. This absorbs the heat in

the extract air and passes it to the

supply air.

Run around coil systems

The heat recovery unit is made up of

several heat exchangers. The energy

is transferred indirectly using heattransfer medium via the interface

between the hot air and the heat

transfer medium and the interfaces

between the energy heat transfer

medium and the cold air.



Run around Coil Systems

AL-KO HEHR (High efcieny Heat recovery)

The AL-KO run around coil system

achieves the highest possible heat

recovery values considering construc-

tional criteria, like hydraulic circuit,

geometry and heat flow capacity.

The capacity of the system can be

adjusted to high demands for optimal

achievement of economic criteria.

In the run around coil system the

heat exchange elements for cooling

are integrated into the extract airflow

and for heating in the outside airflow.

A pipe system connects the two coils

and serves as a energy transport

medium. The circulating water-glycol

fluid removes the heat energy from the

hot extract air and transfers 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 efciency outside air

Inlet, fresh air

Outlet, fresh air

Inlet, exhaust air

Outlet, exhaust air

Glycol content, Antifrogen N

AL-KO Standard system design

1 : 1

2 m/s

70 %

-12 °C / 85 % r. F.

11,8 °C / 13,2 % r. F.

22 °C / 10 % r. F.

-1,8 °C / 50 % r. F.

25 %



System description

Operation of the AL-KO

run around coil system

I Use of high performance heat ex-

changers in a multiple countercur-

rent circuit. This achieves high

annual utilisation ratios of 80%.

I Each heat exchanger has only one

mode of air flowing through (fresh

or extract air) so that germs and

contamination cannot be transferred.

I The system is used during the winter

period to pre-heat the fresh air and

in the summer to pre-cool the fresh

air through adiabatic cooling of the

extract air.

I Because of humidification of the ex-

tract air during summer period the air

is cooled and the cooling transferredto the supply air. Humidity cannot be

transferred between the airflows.

Because the exhaust air temperature

is raised in the exhaust air heat ex-

changer, it leaves the building with-

out moisture.

I Depending on the type of humidifier

(evaporation humidifier, high pressure

nebuliser, air washer) the humidifica-

tion is able to use service water,

demineralized or adul terate water.

I The AL-KO outside air heater can be

divided in accordance with VDI 6022.

The defroster with wide fin spacing,

installed before the filter, raises the

outside air temperature sufficiently to

avoid frost formation on the filter

medium and thus ensures compliance

with the relative humidity required byVDI 6022.

Exhaust air

Outdoor air

Extract air

Supply air

Hybrid humidifier

DVE

Leistungsregelungprimärseitig

PWW 50/30

HydraulicModul

PWW 50/30

SN

MID

ZL

VE

PTH

M

M

M

5 2 4 3 2

I For dehumidifying an additional heat

recovery system exchanger is installed

after the dehumidifying cooler. During

dehumidifying operation the energy

medium will first be directed over the

heat recovery reheater to raise the

supply air temperature. The thereby

reduced water temperature considera-

bly reduces the outlet temperature

at the heat recovery coil. This system

circuit saves approximately 20 % cooling

capacity.



HEHR run around coil system design

I The division in to separate self-

sufficient systems ensures a very high

operational safety and optimal energy

transfer. The heat transfer medium

impinges directly on the heater and

cooler. This design removes the need

for an intermediate medium and additi-

onal medium pumps.

I All hydraulic components needed

for the operation are contained on

a supporting frame.

I Cooler and heater are tubed and

connected in accordance with proven

layouts.

I This energy transfer concept is installed

at the factory and piped together on site

by customer installers. There is no re-

quirement for factory specialists for this

system. The same applies for servicingand maintenance. All heat exchangers

can be high-pressure cleaned up to the

core.

I The excellent performance values of

the AL-KO-systems result in a short

amortisation period.

Heat exchangers:

The standardised AL-KO heat exchangers

consist as standard of copper tubes with

expanded aluminium fins and stainless

steel frame. For increased requirements

the multifarious material combinations

are further enhanced by high quality coa-

tings from two component epoxy resin

or polyamide. The heat exchangers are

designed around the principle of multiple

countercurrents. The heat exchangers

can be completely drained and vented



AL-KO THERM GmbH

Hauptstraße 248-250

89343 Jettingen-Scheppach

Phone (+49) 8225 / 39-0Fax (+49) 8225 / 39-113

E-mail [email protected]

www.al-ko.com

AL-KO Lufttechnik – Auszug aus der Referenzliste

Projekt

WRG: Wärmerückgewinnung ERG: Energierückgewinnung (Wärme / Kälte etc.) SN: Sommernachwärmung bei Entfeuchtung über ERG

Verbund: Mehrere Lüftungsgeräte zu einem Anlagenverbund zusammengeschlossen

ZUL ges.

m3 / h

ABL ges.

m3 / h

Anzahl

Geräte

WRG ERG SN Ver-

bund-

anlage

Adiabate

Abluft-

befeuch-

tung

Hybride

Abluft-

befeuch-

tung

Aircabin Laupheim 382 000 382 000 6 + 6 X X

Bio Zentrum Köln 264 000 220 800 6 + 9 X X

Böhringer Ingelheim 27 500 27 500 1 + 1 X

Creavis Marl I. BA 58 300 51 450 5 + 4 X X X

Creavis Marl II. BA 59 500 45 500 6 + 5 X X

Diakonie Bremen 38 000 38 000 1 + 3 X X X

Ehrmann Moskau 50 000 50 000 1 + 1 X

FHG IZI Labore Leipzig 9 000 9 000 2 + 2 X X

Franziskus Stif t Lohne 35 000 35 000 1 + 1 X

Fraunhofer Erlangen II. BA 52 650 52 650 6 + 6 X

Fraunhofer ITEM Hannover 83 000 71 700 1 + 2 X X X

Hbf Dresden 43 150 44 120 3 + 3 X

Heiligenhafen 21 080 21 080 2 + 2 X

IFOK Rostock 64 000 64 000 4 + 4 XJogu Mainz Hörsäle 26 315 19 425 1 + 1 X

KH Siloah 10 600 10 850 1 + 1 X

Maritim Hotel Berlin 10 600 10 600 1 + 1 X

Mehrzweckhalle Heilgenhafen 10 000 10 000 X

PTB Braunschweig 30 000 30 000 1 + 1 X X

Reha Kirchberg Luxembourg 129 200 129 200 9 + 9 X

Residenztheater München 9 000 8 500 1 + 2 X X

Rietberg Museum Schweiz 20 000 1 X

Schülke & Mayr 35 000 38 000 1 + 1 X X

Technologiepark Warnemünde 29 275 29 590 1 + 1 X

TIH Hannover 23 000 23 000 1 + 1 X X

Uni Köln Wirtschaf tsgebäude 254 000 250 000 2 + 7 X X

09-092 al-ko prospekt energierückg 6s eng-01

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