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Research Papers

Numerical Model of the Temperature Control Curve Linearity of HVAC Module in Automobile Air-Conditioning System and Applications

[+] Author and Article Information
Xiaohua Qu1

Institute of Refrigeration and Cryogenics, School of Mechanical Engineering, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Shanghai 200240, P.R. Chinaquxiaohua@sjtu.edu.cn

Zhaogang Qi, Junye Shi

Institute of Refrigeration and Cryogenics, School of Mechanical Engineering, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Shanghai 200240, P.R. China

Jiangping Chen1

Institute of Refrigeration and Cryogenics, School of Mechanical Engineering, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Shanghai 200240, P.R. Chinajpchen70@yahoo.com.cn

Hua Zhou

School of Aerospace Engineering and Applied Mechanics, Tongji University, No. 100, Zhangwu Road, Shanghai 200092, P.R.China

1

Corresponding authors.

J. Thermal Sci. Eng. Appl 2(4), 041008 (Feb 24, 2011) (8 pages) doi:10.1115/1.4003508 History: Received August 13, 2010; Revised January 16, 2011; Published February 24, 2011; Online February 24, 2011

In the present work, a numerical model of the temperature control curve (TCC) linearity of the heating ventilating and air conditioning (HVAC) module in automobile air-conditioning system is established. The numerical model is composed of several higher precision submodels. The simulation results are validated by experimental data performed on a calorimeter test bench. It is found that the simulation data agree with the experimental data very well. The maximum deviations of the airflow rate and the temperature are 3% and 1.4°C, respectively. The factors, which influenced the TCC linearity, are numerically studied. The simulation results show that the different door configuration needs to be matched with the division type for vent ducts of the HVAC module outlet, which can decrease the temperature stratification of airflow at the outlets. Cold and hot air mixing ratio determines the slope of the linearity curve. In addition, the further the distance between the HVAC module outlet and the mixing chamber and the greater the turbulent intensity, the more the cold-hot airflow will fully mix. It contributes to the temperature uniformity at the outlets.

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Figures

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Figure 1

HVAC system geometry and key features

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Figure 2

Simplified geometry with all ducts for CFD analysis

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Figure 3

Pressure drop of evaporator core varies with airflow rate

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Figure 4

The performance of heater core varies with airflow rate

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Figure 5

The performance curve of blower

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Figure 6

Grid independency study

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Figure 7

Schematic of psychrometric calorimeter test bench

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Figure 8

HVAC module with ducts installed in test bench

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Figure 9

Numerical results compared with experimental data: (a) the relative comparison of airflow rate at each outlet and (b) the relative comparison of temperature at each outlet

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Figure 10

Network of design and optimization for the HVAC module

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Figure 11

The door configurations and operating torque (flat-type door versus butterfly-type door)

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Figure 12

The effect of HVAC module outlet channel (vent mode, temperature-blend door delivery position is at 3/6)

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Figure 13

The effect of mixing ratio of cold-hot airflow: (a) velocity vectors colored by temperature at 3/6 position of vent mode on A-A section of the HVAC module and (b) the TCC curves at the vent mode on different cases

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Figure 14

The effect of mixing chamber: (a) the effect of mixing chamber (velocity vectors colored by temperature at 3/6 position of the B/L mode on A-A section of the HVAC module and (b) TCC curves on the B/L model

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