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Dear TRNSYS-users, I’m
using type 60c with a heat exchanger connected with a heat pump. It seems that
when the mass flow rate of the fluid within the heat exchanger pipe is zero, there
is not any heat transfer between the fluid in the pipe and the fluid in the storage.
Does anyone know what convective heat transfer coefficient is considered at
the inner wall of the heat exchanger pipe? In order to consider the
heat transfer due to natural convection within the pipe, in case of zero flow
rate, I would like to set an effective flow rate, but I need to know what
_expression_ has been employed to define the Nusselt number. I couldn’t
find any information about it, can anyone help me? (Dittus Boelter equation?). Thank you in advance, Tiziano Terlizzese |