Chapter 5, Problem 5.21P

Two Carnot engines work in series between source and sink temperature of 04 1200K and 300K. Find out the intermediate temperature if 1) Both engines having same efficiency 2) Both engines develop equal power.

A Carnot engine having a 340 x 620 mm bore and stroke operates between 500 degree Celsius and 50 degree Celsius. The engine rejects 45 kJ of heat in the atmosphere while running at 400 rpm. Assuming a four stroke engine. Find a. thermal efficiency ( %) b. Wnet (kJ) c. Power Produced (kW)

18. A waste heat recovery boler produces 1 MPa dry saturated steam from 100 'C feedwater. The boiler receives hot gases(Cp 1.0) at 4.2 kg per sec at a temperature of 950 C. After passing through the waste heat boiler, the temperature of hot gases has been reduced to 250 C. How much steam in kg is produced per hour? Note: At 1 MPa dry saturated, h 2778.1 k/kg. A 4487.8 kg B. 4847.8 kg C. 4748.8 kg D. 4887.4 kg

Consider a diesel electric plant which consumes a thousand liters of fuel with 20 degree API at 200K in a day. Calculate the fuel rate in kg/min.

PLEASE FIND CORRECT SOLUTION

I just need clarification what are TL and TH? Where do we get the values from?

2.A steam throttling valve with inlet conditions of 2MPA and 400C is connected to the inlet of the turbine. The turbine has 200kW power output and heat abstracted of 100kW. If the mass flow rate is 1kg/s and the exit temperature of steam is 300C, find the exit turbine pressure.

9. When developing a certain power, the specific fuel con- sumption of an internal combustion engine is 0-255 kg/kWh (brake) and the mechanical efficiency is 86% Calculate (i) the indicated thermal efficiency, and (ii) the brake thermal efficiency, taking the calorific value of the fuel as 43-5 MJ/kg. If 35 kg of air are supplied per kg of fuel, the air inlet being at 26°C and exhaust at 393°C, find (iii) the heat energy carried away in the exhaust gases as a percentage of the heat supplied, taking the specific heat of the gases as 1-005 kJ/kg K.

A certain coal-fired power plant has a rated power capacity of P = 950 MW. The output of this plant is W = 0.39QH, where QH is the energy input as heat from the hot reservoir. a. Calculate the maximum thermal efficiency of the power plant.  b.  Calculate the absolute value of the exhausted heat (QC) each second in MJ for the power plant.  c. How many tons nC of this coal is exhausted as wasted heat to QC in a single day?