A cross-flow heat exchanger having an overall heat transfer coefficient of 150 W/m^2?K is used to heat water from 25ºC to 100ºC at 3 kg/s. Exhaust gases at 250ºC and with a specific heat of 1.0 kJ/kgK are used to heat the water, and these gases leave at 130ºC. Assume both flows are unmixed. Then determine (a) the mass flow of the exhaust gases and (b) the surface area of the heat exchanger.
What will be an ideal response?
The mass flow of the exhaust gases required to heat the water is predicted from an
energy balance, assuming adiabatic external conditions, is (a)
You might also like to view...
Clusters of galaxies are distributed in space ____
a. homogenously b. isotropically c. in long, narrow filaments surrounding empty voids d. statically e. in bubbles surrounded by empty walls
An alternative to the core-accretion theory that explains the formation of the jovian planets is the
A) differentiation theory. B) collision theory. C) gravitational instability theory. D) Big Bang theory. E) nebular contraction theory.
Communications and weather satellites always appear at the same place in the sky because these satellites are
A) beyond the pull of Earth's gravitational field. B) moving at a speed just short of escape velocity. C) orbiting Earth with a 24-hour period. D) stationary in space. E) none of the above
Galena belongs to the class of minerals known as the
A) sulfides. B) sulfates. C) silicates. D) carbonates.