Chemical Engineering Basics
Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type

Parallel flow with unequal heat capacities
Counter flow with equal heat capacities
Parallel flow with equal heat capacities
Counter flow with unequal heat capacities

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Chemical Engineering Basics
What is the effect on the performance of the economiser in the thermal power plant boiler, if the feed water temperature is very low due to preheaters being out for repairs or starving of steam supply ?

Heat transfer efficiency of economiser increases due to picking up high heat from the flue gases
Scale formation rate on economiser tubes increases
It results in corrosion due to the condensation on the flue gas side of the economiser tubes due to handling of low temperature water
Economiser tube life increases due to handling of low temperature water

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