11. Furthermore, the convective heat flux can be determined via the definition of the heat transfer coefficient h, 12. The convective heat transfer coefficient is dependent upon the physical properties of the fluid and the physical situation. 13. Additionally, the temperature of the surroundings and the convective heat transfer coefficient must remain constant and uniform. 14. Besides that, the local heat transfer coefficient inside the tube is depending on the change in temperature. 15. Relative roughness pitch is an important parameter considered for designing artificial roughness to enhance the heat transfer coefficient . 16. Due to the very high heat transfer coefficients for boiling and condensation, heat pipes are highly effective thermal conductors. 17. Architects and engineers call the resulting values either the overall heat transfer coefficient described in lower section of this document. 18. The equation yields the surface averaged Nusselt number, which is used to determine the average convective heat transfer coefficient . 19. This equation shows that the critical radius depends only on the heat transfer coefficient and the thermal conductivity of the insulation. 20. By calculating the heat transfer coefficient from this Biot number, one can find a liquid medium suitable for the application.
