Engineering, 17.04.2020 16:19 dinosaur10

A 250-MW vapor dominated hydrothermal powerplant uses well steam that is saturated at 450 psia at shutoff. The steam is throttled to a turbine inlet pressure of 140 psia. A direct-contact condenser operates at a pressure of 5 psia with a cooling-water inlet temperature of 48°F. The turbine polytopic efficicency is .8 and the turbine-generator combined mechanical-electrical efficiency is .90. Calculate

(a) the steam mass flow rate, in pounds mass per hour,
(b) the condenser cooling water mas flow rate, in pounds mass per hour
(c) the cycle thermal efficiency and heat rate, in BTUs per kilowatt hour, and
(d) the difference between well flow and disposal flow, in pounds mass per hour, if the cooling tower losses by evaporation and drift are 2 percent.

Answers: 1

Show answers

Another question on Engineering

Engineering, 03.07.2019 15:10

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

Answers: 3

Answer

Engineering, 04.07.2019 18:10

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Answers: 1

Answer

Engineering, 04.07.2019 18:10

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

Answers: 1

Answer

Engineering, 04.07.2019 18:10

The filament of an incandescent lamp has a temperature of 2000k. calculate the fraction of radiation emitted in the visible light band if the filament is approximated as blackbody

Answers: 2

Answer

You know the right answer?

A 250-MW vapor dominated hydrothermal powerplant uses well steam that is saturated at 450 psia at sh...

Questions