CFD model of vehicle condenser

Ing. Michal Schmid

Disertační práce

Anotace:

The AC condenser plays a vital role in HVAC systems (Heating Ventilating Air Conditions). In vehicles, it is typically located within a cooling pack, alongside other heat exchangers. The dissipation of heat from the AC condenser directly affects surrounding components. Therefore, accurate modeling of heat transfer between the refrigerant and air is crucial for vehicle development, especially nowadays for battery electric vehicles. The proposed model enhances the spatial distribution of heat transfer, resulting in improved air temperature predictions. The proposed model is based on the well-known and established ? - NT U approach and iterative takes into account the appropriate relation according to the refrigerant phase during the condensation process occurring in the condenser. Additionally, the approach reduces the amount of required input data and relies on directly measured condenser characteristics, leading to more generic approach. In the thesis, a dedicated test equipment was developed for input data measure ment and model verification. The proposed model was tested under two distinct conditions and compared with measurements. The model exhibited good agreement with the measurements in predicting refrigerant inlet and outlet temperatures, as well as relatively good agreement in air outlet temperature prediction. Furthermore, additional development tasks were identified as well.

Abstract:

The AC condenser plays a vital role in HVAC systems (Heating Ventilating Air Conditions). In vehicles, it is typically located within a cooling pack, alongside other heat exchangers. The dissipation of heat from the AC condenser directly affects surrounding components. Therefore, accurate modeling of heat transfer between the refrigerant and air is crucial for vehicle development, especially nowadays for battery electric vehicles. The proposed model enhances the spatial distribution of heat transfer, resulting in improved air temperature predictions. The proposed model is based on the well-known and established ? - NT U approach and iterative takes into account the appropriate relation according to the refrigerant phase during the condensation process occurring in the condenser. Additionally, the approach reduces the amount of required input data and relies on directly measured condenser characteristics, leading to more generic approach. In the thesis, a dedicated test equipment was developed for input data measure ment and model verification. The proposed model was tested under two distinct conditions and compared with measurements. The model exhibited good agreement with the measurements in predicting refrigerant inlet and outlet temperatures, as well as relatively good agreement in air outlet temperature prediction. Furthermore, additional development tasks were identified as well.

Klíčová slova

AC Condenser, CFD, Heat Transfer, Measurement

Jazyk práce: čeština

Datum vytvoření / odevzdání či podání práce: 31. 8. 2023

Obhajoba závěrečné práce

• Obhajoba proběhla 13. 11. 2023
• Vedoucí: doc. Ing. Petr Tomek, Ph.D.

Univerzita Pardubice

Dopravní fakulta Jana Pernera

Doktorský studijní program / obor:
Technika a technologie v dopravě a spojích / Dopravní prostředky a infrastruktura: Dopravní prostředky