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Heat Transfer
Heat Exchangers
Previous Years Questions

Saturated steam at $${100^ \circ }C$$ condenses on the outside of a tube. Cold fluid enters the tube at $${20^ \circ }C$$ and exits at $${50^ \circ }C... For a heat exchanger,$$\Delta {T_{\max }}$$is the maximum temperature difference and$$\Delta {T_{\min }}$$is the minimum temperature difference be... Saturated vapor is condensed to saturated liquid in a condenser. The heat capacity ratio is$${c_r} = {{{c_{\min }}} \over {{c_{\max }}}}.$$The effec... In a heat exchanger, it is observed that$$\Delta {T_1} = \Delta {T_2},$$where$$\Delta {T_1}$$is the temperature difference between the two single ... In a condenser of a power plant, the steam condenses at a temperature of$${60^ \circ }C.$$The cooling water enters at$${30^ \circ }C$$and leaves a... For the same inlet and outlet temperatures of hot and cold fluids, the Log mean temperature Difference$$(LMTD)$$is The practice to use steam on the shell side and cooling water on the tube side in condensers of steam power plant is because In shell and tube heat exchanger, baffles are mainly used to ## Marks 2 In a counter-flow heat exchanger, water is heated at the rate of$$1.5kg/s$$from$$\,40{}^ \circ C\,$$to$$\,80{}^ \circ C\,$$by an oil entering at... Consider a parallel-flow heat exchanger with area$${A_p}$$and a counter-flow heat exchanger with area$${A_c}.$$In both the heat exchangers, the h... A balanced counter-flow heat exchanger has a surface area of$$20\,\,{m^2}$$and overall heat transfer coefficient of$$20W/{m^2}$$-$$K$$. Air ... In a concentric counter flow heat exchanger, water flows through the inner tube at$${25^ \circ }C$$and leaves at$${42^ \circ }C$$. The engine oil ... A double-pipe counter-flow heat exchanger transfers heat between two water streams. Tube side water at$$19$$liter/s is heated from$${10^ \circ }C$$... Water (specific heat,$${c_p} = 4.18\,\,kJ/kgK$$) enters a pipe at a rate of$$0.01kg/s$$and temperature of$${20^ \circ }C.$$The pipe, of di... Water (specific heat,$${c_p} = 4.18\,\,kJ/kgK$$) enters a pipe at a rate of$$0.01kg/s$$and temperature of$${20^ \circ }C.$$The pipe, of di... Water$$\left( {{C_p} = 4.18\,kJ/kg.K} \right)$$at$${80^ \circ }C$$enters a counter flow heat exchanger with a mass flow rate of$$0.5kg/s.$$Air ... In a parallel flow heat exchanger operating under steady state, the heat capacity rates (product of specific heat at constant pressure and mass flow r... The$$LMTD$$of a counter flow heat exchanger is$${20^ \circ }C$$. The cold fluid enters at$${20^ \circ }C$$and the hot fluid enters at$${100^ \ci...
In a counter flow heat exchanger, hot fluid enters at $${65^ \circ }C$$ and cold fluid leaves at $${30^ \circ }C.$$ mass flow rate of the hot fluid is...
Hot oil is cooled from $${80^ \circ }C$$ to $${50^ \circ }C$$ in an oil cooler which uses air as the coolant. The air temperature rises from $${30^ \c... In a condenser, water enters at$${30^ \circ }C$$and flows at the rate$$1500Kg/hr.$$The condensing steam is at a temperature of$${120^ \circ ...
In a counter flow heat exchanger, for the hot fluid the heat capacity $$= 2kJ/kg$$ $$K,$$ mass flow rate $$= 5 kg/s,$$ inlet temperature $$= {150^ \c... Air enters a counter-flow heat exchanger at$${7^ \circ }C$$and leaves at$${40^ \circ }C$$. Water enters at$${30^ \circ }C$$and leaves at$${50^ \...
In certain $$HE,$$ both the fluids have identical mass flow rate-specific heat product. The hot fluid enters at $${76^ \circ }C$$ and leaves at $${47^... ## Marks 5 Two fluids,$$A$$and$$B$$exchange heat in a counter-current heat exchanger. Fluid$$A$$enters at$${420^ \circ }C$$and has a mass flow rate of$$...
Hot water flows with a velocity of $$0.1$$ $$m/s$$ in a $$100mm$$ long, $$0.1m$$ diameter pipe. Heat lost from the pipe outer wall is uniform and equa...
A hot fluid at $${200^ \circ }C$$ enters a heat exchanger at a mass flow rate of $${10^4}\,\,kg/hr.$$ Its specific heat is $$2000$$ $$J/kg$$-$$K.$$ It...
In a certain double pipe heat exchanger hot water flows at a rate of $$50,000$$ $$kg/h$$ and gets cooled from $${95^ \circ }C$$ to $${65^ \circ }C$$. ...
A counter flow heat exchanger is to heat air entering at $${400^ \circ }C$$ with a flow rate of $$6$$ $$kg/s$$ by the exhaust gas entering at $${800^ ... Two streams of fluid of unit constant specific heats and unit mass flow rate exchange thermal energy in an adiabatic heat exchanger. The inlet temps o... A one shell pass, one tube-pass heat exchanger, has counter flow configuration between the shell side and tube side fluids. The total number of tubes ... A double pipe counter flow heat exchanger is to be designed to cool$$12000kg/hr$$of an oil of specific heat$$1.95kJ/kgK$$from$$\,85{}^ ...
A shell and tube heat exchanger is to be designed for heating pressurized water by means of hot gasses which get cooled the data are as follows Temp ...
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