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T₂ = 127 -> 400K
T₁' = 227 -> 500K
η = 1-T₂/T₁.100%
=1-400/800.100%
=0,5.100%
= 50%
η' =1-T₂'/T₁'.100%
= 1-400/500.100%
= 0,2.100%
= 20%