0000001095 00000 n gravity, fluid acceleration and friction. 0000000016 00000 n %PDF-1.4 %���� 0000001246 00000 n What are typical operating problems? Allowable pressure drop. Learning Objectives At the end of this chapter the student should: • Recognise the importance of pressure drop in heat transfer system design • Know the three mechanisms governing pressure drop, i.e. Fundamentals of heat transfer and pressure drop are provided for single-phase, boiling, and condensing services. 48 14 You will have to understand the process thoroughly before you can attempt to specify the pressure drop on each side of the heat exchanger. xref Why select a horizontal instead of a vertical thermosiphon? 0000002626 00000 n Rule of thumb is 10 psi (70 kPa), but it really depends on your process and utility capabilities. 0000005044 00000 n illustrates how the port pressure drop may influence the flow distribution. Selection criteria for common applications are discussed, guidelines for thermal design are provided, and detailed examples are summarized. %%EOF It surveys common heat exchanger types used in the process industry including shell-and-tube, air-cooled, plate-frame, and plate- fin exchangers. Pressure Drop in Channels and Heat Exchangers. 0000002902 00000 n -y >tself9 &ater %ill only flo%s do%nhill To move any fluid around a plant you need pressure differential. Fundamentals of heat transfer and pressure drop are provided for single-phase, boiling, and condensing services. 0000002978 00000 n 5ƾ�ƞ�ع����d�NI�>�W�����,#wx�.gow����YwDS�ڒ��4XOR�>#����GY��:utD*�٨�:,D�D����?�J�݋��� 9���)0LnN��6��XF>#3�[��l�5*ʗ�G�v� �'}P�g�4N�qE⒂;��� W�l����fBJ�Q�vr9ʮ.�l�/H�����,־ q���������X&$�G��@֢\�� �M��ݨ ��C �Ĺ g%��4���z䳾� �k?Y�H � Q��N,�e[Q��[۷����Sg�6A���sKB�ň!�P����d�i)w��N��I�{�pF[ N0�P��V}��ʞ��,��5��5�D 0000002660 00000 n This course focuses on developing design checklists and rules-of- thumb to help engineers avoid common problems in process heat transfer. 61 0 obj<>stream trailer 0000007713 00000 n As a rule of thumb, start with 10 psi on both the shellside and the tubeside. This change in heat rejection from air to water greatly improves the efficiency because the heat transfer is much better with water due to its increased heat capacity. 0000000886 00000 n Engineers who have recently graduated and more experienced engineers who are responsible for design and operation of process heat exchangers will find this course valuable. 0000000576 00000 n 2. Industry case studies of thermal design and operational problems are presented and lessons learned discussed. Simulators usually do not sho% the control valves or piping pressure drop. Engineers—from novice to expert—who want to improve their design process and checklists, Types and applications of heat exchangers, Fundamentals of heat exchanger performance, Single-phase applications and performance, Types and Applications of Heat Exchangers, Fundamentals of Heat Exchanger Performance, Single-phase Applications and Performance, Two-phase pressure drop in condensing applications. 0000001730 00000 n The pressure drop across a shell and tube heat exchanger is mainly a function of the heat exchanger structure and shell & tube arrangement. �o. If there is a pump upstream of the heat exchanger, there probably will be no concern about pressure drop as w|�T{dP��bdA\�䣒g� �(�Ѝ��gT��^��njjA�Gm�&`�t`Kzg��:�O{�3j�Dt_�s%B�#�h�DV x�b```f``���$03 �0P9��``:8��� o c����i�* rK�C��?��Ϭ��jb �L5�R��jVtzJp�ٗ��Ǧ�k�t5r�k���r�n�60p0�600p00��400)i�YC#@�Z�X��@=���6in ��]�����=��9��������%���>m0w +�d��H3�5�3p�{ iF b0 6�? A copy of Process Heat Transfer: Principles, Applications, and Rules of Thumb, by Robert Serth and Thomas Lestina, is included with the course and serves as the primary reference for course material. It surveys common heat exchanger types used in the process industry including shell-and-tube, air-cooled, plate-frame, and plate- fin exchangers. startxref 0000000966 00000 n 0000003226 00000 n The exception is a heat exchanger that is acting as a condenser. A general rule of thumb for a proper design of the PHE, with acceptable maldistribution, is that the pressure drop over the port connection should not be greater than approximately 25% of the total pressure drop. When designing an exchanger the usual practice is to specify a maximum allowable pressure drop. A condenser can have flo%9 but no significant pressure change. <<2A1E9DE1B1980C4ABB167498456A7F77>]>> the first figure, you can see that the heat rejection at the evaporator and condenser change from air to water as you move from split system to water cooled chilled water system. If the heat exchanger is very How do you size a heat exchanger for an application? How much margin should you select? 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