Hello,
1: Please be aware that the specific heat of steam differs (is less) from that of water, and steam's temperature is more sensitive to heat transfer.
2: Regarding the steam side, I would suggest investigating condensation by either explicitly modeling multiphase phenomena or by varying the properties. Based on my understanding of your situation, the steam at the outlet, which is at 76°C, is still in vapor form (with steam properties). This representation may not accurately depict the phenomenon.
Question: Are you conducting a Conjugate Heat Transfer (CHT) simulation? In other words, have you meshed the pipes to account for their thickness? Can you also share some snippet of the mesh.
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