|Tipo di tesi||Tesi di laurea magistrale|
|Titolo||MODELLAZIONE DI UN IMPIANTO DI CONDIZIONAMENTO ALLO STATO D’ARTE PER USO VEICOLISTICO|
|Titolo in inglese||MODELING OF A STATE OF THE ART AIR CONDITIONING SYSTEM FOR VEHICLE USE|
|Struttura||Dipartimento di Ingegneria "Enzo Ferrari"|
|Corso di studi||Ingegneria Del Veicolo (D.M.270/04)|
|Data inizio appello||2021-04-15|
|Disponibilità||Accesso limitato: si può decidere quali file della tesi rendere accessibili. Disponibilità mixed (scegli questa opzione se vuoi rendere inaccessibili tutti i file della tesi o parte di essi)|
|Data di rilascio||2061-04-15|
L’obiettivo del seguente lavoro di tesi è presentare uno studio sperimentale dell’R1234yf come sostituto immediato del refrigerante R134a in un sistema di aria condizionata per veicolo elettrico.
The goal of the following thesis is to present an experimental study of R1234yf as an immediate replacement for the R134a refrigerant in an air conditioning system for electric vehicles. An energy characterization is carried out with both refrigerants using the cooling capacity, the power absorbed by the compressor and the COP as main performance parameters. The main problem using R1234yf is its high flammability which can cause fires in case of leaks in the air conditioning system. Therefore, R1234yf will be a passing refrigerant that will then leave the field to CO2 (R744) in the coming years. To simulate the operation of air conditioning, while driving, the WLTP drive cycle was assigned, used both for a vehicle with an internal combustion engine and for an electric vehicle. In order to achieve the goal of the following work, it was necessary to introduce an internal heat exchanger in the system and dimension it appropriately to maximize its performance. Having sized the IHX and defining the new initial system conditions for the new refrigerant, the COP of the system with R1234yf has reached values close to those with R134a. Another goal of the thesis work was to create a new layout for extreme climatic conditions in winter. The new layout, in heating mode, consists in replacing the PTC heater with an internal condenser and adding a valve system to allow the refrigerant to bypass the expansion valve for cooling and the evaporator. The internal condenser is efficient at low temperatures but in particular climatic conditions, for temperatures around -10 ° C, it becomes increasingly difficult to heat the cabin of an electric vehicle. A solution proposed in the following work is to add a PTC heater, in addition to the internal condenser, which will be useful in critical climatic conditions, at temperatures well below zero. Finally, the dehumidification during the heating of the cabin was treated to subtract the humidity released by the passengers in addition to that already present in the air. Dehumidification is a crucial step because excessive humidity in the air, present in the car cabin, could cause the windshield to mist up and not guarantee safe driving.