Service Solution Success

Air Conditioning System

CFD simulation analysis of air conditioning system contains: simulation analysis of natural and forced ventilation, carbon dioxide distribution in passenger compartment, defrosting and deicing, thermal comfort in passenger compartment.

Natural ventilation

Our services include:

1) assessment of natural ventilation performance.

2) shape design of front cover plate.

3) thermal comfort improvement design.

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Cowl shape design

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Design of ventilation grille position and angle based on occupant cabin thermal comfort

Forced ventilation

    The simulation analysis is carried out by using the detailed model containing passenger compartment, HVAC system and dummies. The number of computational meshes is about 15000000.

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Computational model

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Front flow field in passenger cabin

Carbon dioxide distribution

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Carbon dioxide distribution in passenger compartment

Defrosting and deicing

Process

    1) CAD modeling

    2) Mesh generation and Setting of B.C..

    3) Steady calculation and Flow analysis(on wind-shield)

    4) Transient calculation and deicing and defrosting analysis.

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CAE analysis process of defrosting and deicing

Example

    Compared with the original model, the flow rate of the left and right air outlets of the optimized one is more uniform and the flow field distribution on the windshield is more uniform.

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Computational model

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The flow rate of the left and right outlets

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               original model Optimization model

Flow field distribution near the windshield

Thermal comfort

   Evaluate temperature & humidity change of human body and surrounding environment by coupling thermal fluid and dummies.

Input data:

    Dummy (divided into 17 segments)

    Sex

    Age

    Body fat rate

    Metabolic rate

    Clothing condition

    Air exposure

CFD B.C.:

    Air temp.

    Vapor flux

    Skin temp.

    Vapor pressure

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JOS model and occupant compartment model

Results to be obtained:

    Skin temperature

    Skin moisture rate

    Thermal flux between body and air

    Humidity from a body

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Distribution of thermal comfort in passenger compartment

Experiences

1)Cool-down and warm-up analysis (PMV assessment)

2)Defrosting, deicing, demisting analysis

3)Analysis of natural and forced ventilation

4)Noise analysis of ventilation system

5)Thermal comfort with solar radiation taken into account

6)Development of fan impeller and scroll

7)Optimization of flow rate distribution of air conditioner duct in commercial vehicle

8)Process development for analysis of air ventilation system

Engineering service

Air Conditioning System