This lecture covers the fundamentals of internal forced convection, including the mean temperature and total heat transfer. It discusses the convection coefficient in laminar flow and circular tubes, fluid-dynamic aspects, thermal aspects, velocity profiles, temperature profiles, and energy balances. The lecture also explores the critical aspects of flows in pipes and heat transfer, emphasizing the importance of understanding flow conditions, boundary conditions, and transport laws. The instructor provides insights into the heat transfer coefficient calculations for different geometrical and flow conditions, focusing on the energy balance for internal flows.