version 15/3/2000 ccd2 - hvac architecture 1 hvac unit : localisation in vehicule

Version 15/3/2000 CCD2 - HVAC ARCHITECTURE

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HVAC UNIT : LOCALISATION IN VEHICULE

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Evaporator

Blower

Demisting / defrosting flap

Vent flat

Heater core

Mixing flap

Air inlet flap

Filter

Feet heating flap

Recirculationair intake

Air intake grille

HVAC unit

HVAC : Heating, Ventilating & Air Conditioning Unit

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OBJECTIVES

SAFETY

THERMALCOMFORT

VISIBILITY

WINTERSUMMER

* WINDSCREEN* LEFT & RIGHT SIDE

* HEATING* COOLING

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Vehicle integration

VEHICLE INTEGRATION

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AIR CIRCULATION

EXHAUST DUCTS

VEHICLE AIR INLET

WATER SEPERATOR

HVAC UNIT

COCKPIT / AIR DUCTS

PASSENGER COMPARTMENT

AIR CIRCULATION

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BLOWER SUBASSEMBLY

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BLOWER

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THERMAL SUBASSEMBLY

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THERMAL SUBASSEMBLY: TEMPERATURE CONTROLWITH WATER FLOW CONTROL

HEATER COREM

EVAPORATOR

WATER VALVE

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THERMAL SUBASSEMBLY: COMPARISON OF DIFFERENT TYPES OF TEMPERATURE CONTROL

Air Mixing control Water flow control

+ - + -

Cost High volume Low volume Cost

Natural bilevel Aerothermic set-up

Left & right température

control

Influence of engine speed

Fast answer Heater core wear No over-heating Temperature linearity

Good stability Design of heater core

Pressure drop on air circulation

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THERMAL SUBASSEMBLY: EVAPORATOR

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THERMAL SUBASSEMBLY: ELIMINATION OF CONDENSATES

Wall to trap dropletts

Position 9 to 15° in the vehicle

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THERMAL SUBASSEMBLY: HEATER CORE

Mechanical assembly technology

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THERMAL SUBASSEMBLY: HEATER CORE

Brazed aluminium technology

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AIR DISTRIBUTION: FEET / HEATING MODE

The distribution control is on the “Feet” position; the demisting nozzle is usually permanently

supplied (by design leak: 10% of the flow rate). The position of the blower control and the heating control are adjusted according to requirements (the colder the external temperature, the larger the flow rate).The air intake control is on outside air.The A/C control is switched on (the compressor starts up as soon as the temperature so permits).

A/C

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CENTRED HVAC UNIT

2 SUBASSEMBLIESEXAMPLE

Opel Vectra

DISTRIBUTIONBLOCK

THERMALBLOCK

BLOWERBLOCK

AIR INLETBLOCK

X

Y

1/2

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CENTRED HVAC UNIT

ADVANTAGES DISADVANTAGES

Same unit for left and right hand drive

Volume in x or z axis (--)

Cost

Compacity in y axis (glove box)(++)

Left and right separate temperature control (++)

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CENTRED HVAC UNIT WITH LATERAL BLOWER

BLOWERBLOCK

AIR INLETBLOCK

Y

DISTRIBUTIONBLOCK

THERMALBLOCK

X

Evaporator

1 2

3/4

4 SUBASSEMBLIESEXAMPLES

Peugeot 406Peugeot 605

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CENTRED HVAC UNIT WITH LATERAL BLOWER

ADVANTAGES DISADVANTAGES

Left and right separate temperature control (+)

Volume in x or z axis (-)

Compacity in y axis (+) Cost (--)

Different units for left and right hand drive

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HALF CENTRED HVAC UNIT

AIR INLETAND BLOWER

BLOCK

Y

DISTRIBUTIONBLOCK

HOTBLOCK

X

Heater core

1 2

3/4

4 SUBASSEMBLIESEXAMPLES

Renault SafraneRenault Laguna

COLDBLOCK

Evap

orat

or

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HALF CENTRED HVAC UNIT

ADVANTAGES DISADVANTAGES

Left and right separate temperature control (+)

Cost (--)

Compacity in x axis (+) Volume in y axis (-)

Different units for left and right hand drive

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NON CENTRED HVAC UNIT

AIR INLETAND BLOWER

BLOCK

Y

DISTRIBUTIONBLOCK

X

1/2

2 SUBASSEMBLIESEXAMPLES

Citroën ZXCitroën XantiaVW

COLDBLOCK

HOTBLOCK E

vapo

rato

r

Heater core

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NON CENTRED HVAC UNIT

ADVANTAGES DISADVANTAGES

CostLeft and right separate temperature control (--)

Compacity in x axis (++) Volume in y axis (--)

Different units for left and right hand drive

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It is near the air inlet, in the engine compartment, or between the blower and the evaporator in the cockpit

THE CAR CABINE FILTER

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ENDURANCE On VEHICULE

PARTICLES FILTERS CHARACTERISATION

Big town Semi-urban Motor-way

Pre

ssu

re d

rop

by

fou

ling

(P

asca

ls)

Kilometers (Km)

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The filter should be controled systematically during maintenance operations

FILTER FOR CAR CABINE

Old FilterNew filter

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PARTICLES FILTER

Filtering level: X% of 0,5 m particlesLife time: 30000 km (class B - 4dm², thickness 20 mm)

Pitch: 2,5mm

Frame(Polypropylene)

LutingCorrugated

Media

Seal (foam)

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AIR INLET SUBASSEMBLY: PARTICLE FILTERS

BEFORE BLOWER AFTER BLOWER

Peugeot 605 Citroën Xantia

Renault Safrane BMW 5 series

Volvo 850

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COMBINED GAS AND PARTICLES FILTERS