Prezentace na téma: "Tutorial: Physics Topic: Cooling engine system Prepared by : RNDr. Ondřej Jeřábek Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován."— Transkript prezentace:
Tutorial: Physics Topic: Cooling engine system Prepared by : RNDr. Ondřej Jeřábek Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.
General information: Provides heat transfer from engine valves Ensures constant temperature of engine Provides quicker reaching of operation temperature Provides car heating Types of cooling system: Liquid cooling system Air cooling system
Technical system used to keeping constant temperature Thermostat output can influence cooling, heating or air-conditioning Mechanical thermostats They are controlled by heat expansion of liquids or gases For regulation of car cooling system there are used thermostats with wax charge Wax expanses when it is heated and it shrinks when it is cooled
Technical system used to heating exchange For coolers´ production there are used materials with high temperature conductance e.g. aluminium and copper Metal piping usually goes through cooler which is covered by aluminium material Active cooler Cooler with fan Fan provides air flow when the car is not running Fan provides quick heat removal
Requirements: Take as much heat as possible to weight unit Not to cause corrosion of cooling system – corrosion generally comes when pH falls down below value 8 Provide cooling at low temperatures - cooling liquid is filled with anti-freezing mixture The shortest exchange interval – cooling liquids of modern cars have the same durability as engine durability
Heat source Cooling liquid flows through places with the highest heat loading, it means through engine block and engine head Engine valves are washed by cooling liquid directly or indirectly Operation engine temperature is about 90°C Keeping operation temperature is important because of engine efficiency and lubrication