Water is the working fluid in a regenerative Rankine cycle with one open feedwater heater. Steam enters the turbine at 1400 lbf/
in^2 and 1000F and expands to 120 lbf/in^2, where some of the steam is extracted and diverted to the open feedwater heater operating at 120 lbf/in^2. The remaining steam expands through the second-stage turbine to the condenser pressure of 2 lbf/in^2. Each turbine stage and both pumps have isentropic efficiencies of 85%. Flow through the condenser, open feedwater heater, and steam generator is at constant pressure. Saturated liquid exits the open feedwater heater at 120 lbf/in^2. The net power output of the cycle is 1 x 10^9 Btu/h. Determine for the cycle
(a) the mass flow rate of steam entering the first stage of the turbine, in lb/h.
(b) the rate of heat transfer, in Btu/h, to the working fluid passing through the steam generator.
(c) the thermal efficiency.
(a) the mass flow rate of steam entering the first stage of the turbine, in lb/h.
(b) the rate of heat transfer, in Btu/h, to the working fluid passing through the steam generator.
(c) the thermal efficiency.
1 answer:
You might be interested in
Answer:
The required wall thickness is m
Explanation:
Given:
Fluid density
Diameter of tank m
Length of tank m
F.S = 4
For A-36 steel yield stress MPa,
Allowable stress
MPa
Pressure force is given by,
Pa
Now for a vertical pipe,
Where required thickness
m
Therefore, the required wall thickness is m
Given Information:
Inlet velocity = Vin = 25 m/s
Exit velocity = Vout = 250 m/s
Exit Temperature = Tout = 300K
Exit Pressure = Pout = 100 kPa
Required Information:
Inlet Temperature of argon = ?
Inlet Temperature of helium = ?
Inlet Temperature of nitrogen = ?
Answer:
Inlet Temperature of argon = 360K
Inlet Temperature of helium = 306K
Inlet Temperature of nitrogen = 330K
Explanation:
Recall that the energy equation is given by
Where Cp is the specific heat constant of the gas.
Re-arranging the equation for inlet temperature
For Argon Gas:
The specific heat constant of argon is given by (from ideal gas properties table)
So, the inlet temperature of argon is
For Helium Gas:
The specific heat constant of helium is given by (from ideal gas properties table)
So, the inlet temperature of helium is
For Nitrogen Gas:
The specific heat constant of nitrogen is given by (from ideal gas properties table)
So, the inlet temperature of nitrogen is
Note: Answers are rounded to the nearest whole numbers.