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xJJx

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Hi, i’m learning about the thermal efficiency of a diesel cycle at university and I'm trying to understand the equation. The first law of thermodynamics states Wnet + Qnet = 0, but one of the attachments below says Qnet - Wnet = 0 and I don't understand how this is the case. Also, for process 4-1 (isochoric heat rejection), it says that Qout = -mcv(T1-T4); I don't get why the minus is there. Can anyone explain why? Thank you.