| NUMERICAL STUDY OF PRE-VENTILATION EFFECTS
ON CABIN TEMPERATURE USING SOLAR SUNROOF |
| Daewoong Lee1, Hoseong Lee2 |
1Hanon Systems
2Korea Automotive Technology Institute |
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| ABSTRACT |
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When a vehicle is parked under the summer sun, to avoid the passenger discomfort caused by high cabin
temperature, the performance of forced ventilation, which is called pre-ventilation, using a solar sunroof integrated with a
photovoltaic (PV) cell to reduce cabin thermal load is investigated numerically in this study. The vehicle pre-ventilation
system is composed of a solar sunroof, DC/DC converter, and air handling system. The indoor thermal load is reduced by the
hot cabin air that moves when outside air is supplied to the cabin. The simulation model is established with the component
and system model approach using Dymola, and the numerical analysis results are compared with the experimental data. Using
the validated model, pre-ventilation performance is analyzed with 40-, 80-, and 120-W PV cells in each solar sunroof system.
The results indicate that the 40-W PV cell in the solar sunroof is sufficient for this pre-ventilation application considering cost
and cabin thermal comfort performance. Further, the effects on cabin space and DC/DC converter efficiencies were
investigated. The analysis results show that cabin volume slightly affected cabin temperature, whereas the efficiency of DC/
DC converter was not significantly affected by cabin temperature reduction. |
| Key Words:
Air handling system, Cabin thermal load, DC/DC converter, Photovoltaic cells, Solar sunroof, Preventilation,
Thermal comfort |
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Corresponding Author.
Daewoong Lee , Email. 
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