Chapter 6, Problem 6.20P

1. Steam at 14 Mpa and 700°C is received by a regenerative cycle. Before condensation at 70 kPa, steam extracted for feedwater heating at 5 Mpa. On the mass basis of 1 kg of throttle steam, find the thermal efficiency of the engine.  PLEASE SHOW COMPLETE SOLUTION (DRAW THE TS DIAGRAM)

A thermal power plant operates such that the steam exits boiler at 4 MPa, 400C and the condenser pressure is 10 kPa. The efficiency of the turbine and pump is 85% and 90% respectively. a. Draw the plant PFD (Process Flow Disgram) and the process Ts diagram and calculate quality of steam discharge from the turbine as well as the plant's thermal efficiency. b. If the plant produces 300MW of net power, - What is the steam flowrates in kg/hr? - If the plant uses natural gas as a fuel, determine the flowrate of NG in MMSCMD. State the reference for your data. - If the plant uses coal as a fuel, determine the amount of coal required (tonne per annum). State the reference for your data and all your assumptions. c. How much power required by the pump in kW? Is this the real power required by the pump? Explain d. Find the heat rejected in the condenser and evaluate the thermal efficiency using this value. e. The heat rejected to surrounding is through a cooling water system from a nearby ocean.…

3- Air enters the compressor of a gas turbine at 120 kPa, 310 K. The air compressed to 1100 kPa, the turbine inlet temperature is 1460 K and the expansion occurs in two stages, with reheat to 1420 K between the stages at a pressure of 300 kPa. The compressor efficiency is 85 %. The net power developed is 2.2 MW. sketch T -S diagram then Determine: The thermal efficiency of the cycle. Qin Qin The back work ratio. Combustor Reheat combustor Turbine Turbine stage 1 stage 2 cycle Compressor

Thermodynamics

II. Draw the Carnot cycle then prove that the efficiency of a Carnot heat engine is nc=1- TL TH

Steam at 6.2 MPa and 480 deg. C is received by a regenerative engine with ideal conditions and in an ideal cycle. Extractions for feedwater heating occurs at 3 MPa and again at 1.4 MPa, with the remaining steam expanding to 0.0065 MPа. What is the engine work in KW

Draw the schematic diagram for regenerative vapour power cycle with 2 steam blades. Represent the complete process in T-S diagram

The first of the two heat pumps operating on the reverse Carnot cycle 0between 0C and 22oC, and the second between -18oC and 22oCis working. Find the percentage increase between the compressor powers since both are heating at the same value.

2.) A Steam power plant operates using the actual Rankine Cycle where steam initially enters the turbine at 5.0 MPa and 400C then after an irreversible adiabatic process, it exits the turbine with a dryness of 0.90. It then condenses at 7 kPa and exits as saturated liquid. Draw the TS diagram, find the thermal efficiency, and steam rate.