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