Thermal Power Engineering Answers

Two pounds of steam initially having a specific entropy of 1.6356 BTU/lbm-0R and an internal energy 1100.0 Btu/lbm undergo a constant temperature reversible non-flow process at 3000F such that the final entropy is 1.5150 BTU/lbm.0R and the internal energy is 1016.4 BTU/lbm. Find:

The transferred heat, BTU
The work done, ft-lbf

In a marine propulsion plant, the salt water used to condense the exhaust steam enters the condenser at 600F and leaves at 800F. The specific heat of salt water is 0.96 Btu/lbm.0F, the density is 64.0 lb/cu. ft, the cooling water is 5000 gpm and 1 gal=231 cu. in. Find the heat absorbed by the cooling water, BTU/min.

Two pounds of steam initially having a specific entropy of 1.6356 BTU/lbm-0R and an internal energy 1100.0 Btu/lbm undergo a constant temperature reversible non-flow process at 3000F such that the final entropy is 1.5150 BTU/lbm.0R and the internal energy is 1016.4 BTU/lbm. Find:

The transferred heat, BTU
The work done, ft-lbf

at a pressure of 100 psia and 400 degrees F, the specific volume of steam is 4.934 cu. ft/lb, and the specific enthalpy is 1227.5 BTU/lb. Find the internal energy at the given state BTU/lb

2 boilers r connected with parallel to chimney.each boiler is 250 kg/s steam flow with enthalpy 3450 KJ/KG n efficiency is 88.05%,fuel used is 34.3MJ/kg n 8% sulphur.Calculate the chimney height.

A 0.5 m diameter pipe carries steam so that the surface temperature of the pipe is 500 K.
The pipe is in a room with a temperature of 300 K, the room air has a convection coefficient h = 20 W / m2 K and and ɛ = 0.9. Calculate the combined heat transfer coefficient of convection and radiation (hc + hr), and also calculate the heat velocity lost per one meter pipe length .. (Bolzmann constant σ = 5.67 x 10-8 W / m2 K4)

A pipe carrying steam at 230 °C has an internal diameter of 12
cm and the pipe thickness is 7.5 mm. The conductivity of the
pipe material is 49 W/mK the convective heat transfer coefficient
on the inside is 85 W/m2K. The pipe is insulated by two layers of
insulation one of 5 cm thickness of conductivity 0.15 W/mK and
over it another 5 cm thickness of conductivity 0.48 W/mK. The
outside is exposed to air at 35 °C with a convection coefficient of
18 W/m2K. Determine the heat loss for 5 m length. Also
determine the interface temperatures and the overall heat
transfer coefficient based on inside and outside areas.

Air and fuel enter a furnace used for home heating. The air has an enthalpy of 320 kJ/kg and the fuel has an enthalpy of 43027 kJ/kg. The gases leaving the furnace has an enthalpy of 616 kJ/kg. There are 17 kgair/kgfuel, water circulated through the wall furnace receiving heat. The hose required 17.02 kW of heat, what is the fuel consumption per day. (41 kg/day)

feedwater enters a boiler drum at a pressure of 4826 kPa abs, 148.9°C and a specific volume of 0.00109 m^3/kg. steam leaves the superheater of the boiler at 4137 kPa abs, 287.8°C and a specific volume of 0.0546 m^3/kg. calculate: a. the flow work in kj/kg associated with the water entering the boiler drum, and b. the flow work in kj/kg associated with the steam leaving the superheater

What’s the basic difference between fossil fuel burning power plants and geothermal power plants?