Dissertation > Industrial Technology > Chemical Industry > General issues > Chemical machinery and apparatus, equipment > Chemical process machinery and equipment > Heating, cooling machinery

Study of the Temperature Distribution Model and Designing Method for Efficient Shell-and-Tube Heat Exchangers

Author LeiJunJie
Tutor ZhuDongSheng;ZhouZuoYan
School East China University of Science and Technology
Course Chemical Process Equipment
Keywords Shell and tube heat exchanger No phase transition Condensation Temperature Distribution Model Effective average temperature difference
CLC TQ051.5
Type Master's thesis
Year 2012
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The heat exchanger, the temperature of the fluid in the process industry longitudinally along the heat exchanger changes, its physical properties often varies with temperature . Condensation process , the temperature of the fluid , the composition of the gas and liquid phase and vapor phase fraction will change greatly , the possible formation of imports to exports between several different flow -type state . Design and check the heat exchanger , it is critical to accurately predict the heat exchanger flow and temperature fields and static simulation . This paper studies the multi- tube process , different flow pattern layout case heat exchanger no phase transition and the temperature of the condensation heat transfer distribution . No phase transition temperature distribution model is based on the differential method, Nb and tube number n according to the number of baffles , the heat exchanger is divided into a (Nb 1) unit , the ( Nb 1 ) n sub-unit , the tube side fluid cis The views flowing through the sub-unit is parallel to the shell-side fluid flow through the large unit . Condensing temperature distribution model is assumed condensed curve diagrammatically derivation of the temperature distribution of the coolant-side , by the proportional relationship of the temperature and heat load . Based on the above temperature model , by calculating the local temperature of the heat exchanger and the overall effective average temperature difference , explore calculate the amount of surplus heat exchanger design . Further , on the basis of the design method , were used in this model and Cell model to calculate floating head and the U-tube type heat exchanger temperature distribution , no phase change heat transfer temperature distribution calculation model verified by comparison with the calculation result of HTRI accuracy. Condensation model used , the temperature distribution of the condenser will HTRI calculation results compared to verify the feasibility of the model is described by calculating a condenser .

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