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Chapter 4.4 - Heat Exchangers

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Selected questions Chapter 4.4: Heat Exchangers Short type Questions 1. Define effectiveness of heat exchanger? Ans. Effectiveness = to ti (T i ti ) = Cold fluid temp. range Inlet temp. diff . of hot & cold fluid Where, to Cold fluid outlet temperature ti = Cold fluid inlet temperature Ti 2. = = Hot fluid inlet temperature What do you mean by heat duty of a heat exchanger? Ans. 3. Heat duty of a heat exchanger is defined as the heat that is transferred from hot fluid to cold fluid per unit time. Mention 2 basic parameters that have to be measured at site to evaluate the performance of a heat exchanger? Ans. Hot and cold fluid in let and outlet temperatures 2. 4. 1. Mass flow rate of cold and hot fluids What do you mean by capacity ratio in a heat exchanger? Ans. R= Ti To Temp. range of hot fluid = t o t i Temp. range of Cold fluid Where, to Cold fluid outlet temperature ti = Cold fluid inlet temperature Ti = Hot fluid inlet temperature To 5. = = Hot fluid outlet temperature Find the Overall heat transfer coefficient for a shell and tube counter flow heat exchanger where the heat exchanged is 11.27 GJ/hour with the heat transfer area of 96 m2. Assume the LMTD as 76 oC. Ans. Heat Transfer Co-efficient Overall HTC, U = Q/ (A x LMTD) = 11.27 x 106 / (3600 x 96 x 76) = 0.43 kW/m2. K 6. Give the equation to calculate the Overall heat transfer coefficient. Ans. Heat exchanger performance is normally evaluated by the overall heat transfer coefficient U that is defined by the equation U=Q/ (A x LMTD) Where Q = Heat transferred in kCal/hr A = Heat transfer surface area in m2 LMTD = Log Mean Temperature Difference in 0C U = Overall heat transfer Coefficient kCal/hr/m2/0C 4.4 - Heat exchangers (table format) 22

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