Professor I have a question here. Is Carnot cycle totally isothermal? I mean there are two isothermal processes, which are isothermal compression and isothermal expansion. Others are adiabatic compression and adiabatic expansion. These adiabatics are also isothermal, at the same time ?
Adiabatic process means, that system (engine) does not exchange heat with sorroundings. Now according to first law of thermodynamics we know that internal energy can be only changed by either work or heat. Since there is no heat exchange in adiabatic process, work performed by system during decompression (or on system during compression) cannot be compensed by heat exchange so internal energy decreases. Internal energy of ideal gas is in relation with temperature, so that when internal energy changes, temperature has to change too. Therefore adiabatic compression/decompression are not isothermic processes.
Professor I have a question here. Is Carnot cycle totally isothermal? I mean there are two isothermal processes, which are isothermal compression and isothermal expansion. Others are adiabatic compression and adiabatic expansion. These adiabatics are also isothermal, at the same time ?
Adiabatic process means, that system (engine) does not exchange heat with sorroundings. Now according to first law of thermodynamics we know that internal energy can be only changed by either work or heat. Since there is no heat exchange in adiabatic process, work performed by system during decompression (or on system during compression) cannot be compensed by heat exchange so internal energy decreases. Internal energy of ideal gas is in relation with temperature, so that when internal energy changes, temperature has to change too. Therefore adiabatic compression/decompression are not isothermic processes.
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