The heat from the hot side includes
heat loss. Therefore, the received heat of the cold side was
considered as equivalent to the true heat transfer amount. Using
the heat transfer amount, the heat exchanger was divided into M
sections, similarly to the procedure used for numerical analysis.
For each section, the temperature was calculated from the specific
enthalpy of the section and the pressure was calculated with the
assumption that the pressure changes linearly from the inlet to
the outlet