ASHRAE 2001 HVAC Fundamentals Handbook

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Et al. 1956. Resistance coefficients for accelerated and decelerated flows through smooth tubes and orifices. ASME Transactions 78:1071. G. 1951. Laminar flow in tubes with heat transfer. National Advisory Technical Note 2410, Committee for Aeronautics. , T. Sate, and T. Kushida. 1976. The loss of flow in the conical with suction at the entrance. Bulletin of the Japan Society of Mechanical Engineers 19:131. , ed. 1938. Modern developments in fluid mechanics. Oxford University Press, London. Reprinted by Dover Publications, New York.

Such a loss is related to the velocity by the fitting loss coefficient K: 2 V Loss of section = K  ------   2g  (32) Chapter 35 and the Pipe Friction Manual (Hydraulic Institute 1961) have information for pipe applications. Chapter 34 gives information for airflow. The same type of fitting in pipes and ducts may give a different loss, because flow disturbances are controlled by the detailed geometry of the fitting. The elbow of a small pipe may be a threaded fitting that differs from a bend in a circular duct.

Symbols ................................................................................... H EAT is energy in transit due to a temperature difference. The thermal energy is transferred from one region to another by three modes of heat transfer: conduction, convection, and radiation. Heat transfer is among a group of energy transport phenomena that includes mass transfer (see Chapter 5), momentum transfer or fluid friction (see Chapter 2), and electrical conduction. Transport phenomena have similar rate equations, in which flux is proportional to a potential difference.

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