Second Law and Heat Engines

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Second Law and Heat Engines fill in blanks

Defne S

United Kingdom

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Compléter Second Law and Heat EnginesVersion en ligne Second Law and Heat Engines fill in blanks par Defne S 1 The second law of thermodynamics is a physical law which concerns conversions between and . 2 Heat always moves from objects to objects unless is supplied to reverse the direction of heat flo w 3 A heat engine is a device that converts energy into by taking from a - reservoir and rejecting some of it to a - sink . 4 Heat engines work under the following conditions : 1 . Receive from temperature source 2 . Convert part of to 3 . Remaining is rejected to a sink 4 . Operates in a ( Involving a working fluid transfer ) 5 If the system is closed ( no enters / leaves the boundary ) then : Wnet , out = - 6 A thermal energy reservoir is a system that has a thermal capacity . This means that it can supply or absorb large amounts of heat without any changes in . = mass ( m ) x specific heat ( C ) 7 Qout is never a zero value , so the system will always be inefficient The best heat engines are said to have thermal efficiency 8 Thermal efficiency is the fraction of that is converted to : ? th = Wnet , out / Qin = 1 - ( / )