Sleeping evaporator and refrigerant maldistribution: An experimental investigation in an automotive multi-evaporator air-conditioning and battery cooling system
[en] With the arrival of electrified vehicles, the air-conditioning system has to be reconsidered. Battery
cooling management system and high level of comfort for passengers make the single evaporator airconditioning system a multi-evaporator one. In a multi-evaporator air-conditioning system, evaporating pressures are equal in each evaporator so that evaporators are coupled dynamically. However, the demand in cooling capacity and temperature target can vary from each other. For an operating point with a first evaporator working at high load and a second at low partial load, thermal interaction can occur from the superheated refrigerant coming from a first evaporator to the outlet of a second evaporator. This phenomenon makes the second evaporator sleeping since its expansion valve bulb misreads the superheat and closes. Furthermore, sleeping evaporator looks like an extreme case of refrigerant maldistribution in the evaporator. Refrigerant maldistribution is then investigated to show some drawbacks and advantages multi-evaporator air-conditioning systems (MEAC) have to face or can benefit by comparing two types of expansion valve: thermostatic and electronic ones. In this paper, sleeping evaporator and refrigerant maldistribution phenomena are experimentally investigated in order to propose in the future a robust control of an automotive MEAC. A test bench was built to compare two types of expansion valves (thermostatic/electronic) and study their behaviours in steady and transient state to tackle sleeping evaporators and benefit from refrigerant maldistribution.
Research Center/Unit :
Laboratoire de Thermodynamique de l'Université de Liège Centre de Thermique de Lyon - CETHIL
Disciplines :
Mechanical engineering
Author, co-author :
Gillet, Thomas ; Université de Liège - ULiège > Form. doct. sc. ingé. & techno. (aéro. & mécan. - Paysage)
Andres, Emmanuelle
El-Bakkali, Amin
Lemort, Vincent ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Rulliere, Romuald
Haberschill, Philippe
Language :
English
Title :
Sleeping evaporator and refrigerant maldistribution: An experimental investigation in an automotive multi-evaporator air-conditioning and battery cooling system
Alternative titles :
[en] Evaporateur endormi and maldistribution du fluide frigorigène: Etude expérimentale d'un système de climatisation automobile multi-évaporateurs et de refroidissement de batterie
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