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 measurement 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.
Annotation in English
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 measurement 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.
Keywords
AC Condenser, CFD, Heat Transfer, Measurement
Keywords in English
-
Length of the covering note
-
Language
AN
Annotation
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 measurement 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.
Annotation in English
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 measurement 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.
Keywords
AC Condenser, CFD, Heat Transfer, Measurement
Keywords in English
-
Research Plan
-
Research Plan
-
Recommended resources
-
Recommended resources
-
Enclosed appendices
-
Appendices bound in thesis
-
Taken from the library
No
Full text of the thesis
Appendices
Reviewer's report
Supervisor's report
Defence procedure record
Po představení doktoranda byla komise seznámena se stanoviskem školitele a vedoucím školícího pracoviště k disertační práci. Doktorand seznámil komisi se svojí disertační prací formou prezentace. Poté byly předneseny posudky oponentů a doktorand uspokojivě reagoval na připomínky oponentů. V následné veřejné diskusi byly zodpovězeny otázky členů komise, které jsou uvedeny na samostatných listech. Na závěr proběhlo tajné hlasování. Protokol o výsledcích hlasování tvoří samostatnou přílohu.