3. A steam power plant has an average monthly net power delivery of 740 MW over the course ofa year. This power delivery is accomplished by burning coal in the boiler. The coal has a heatingvalue of 9150 Btu/lbm. The cost of the coal is $14.20/ton. The overall thermal efficiency of theplant is,nth=WnetQboiler=0.26 = 26%Determine the annual cost of the coal required to deliver the given average monthly power.

Step 1: Given: Net power output per month=740 MW Heating value of coal=9150 Btu/lbm Cost of…

Answered: 3. A steam power plant has an average…

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.46P

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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?
Thermodynamics PLEASE FILL UP THE TABLE WITH ALL NUMBERS. THANK YOU 9.17 A steam power plant operates with 5 MPa high pressure and boiler exit at 700°C, whereas the condenser exit is at 50°C. Find the cycle efficiency and the pressure in the turbine where the water enters the two-phase region.
Please include a diagram for better understanding. Don't use chatgpt,I am tired of it.
Required information Refrigerant-134a enters the condenser of a steady-flow Carnot refrigerator as a saturated vapor at 65.0 psia, and it leaves with a quality of 0.05. The heat absorption from the refrigerated space takes place at a pressure of 30 psia. Determine the net work input. (Round the final answer to three decimal places.) The net work input is Btu/lbm.
In a test of cycle steam power plant, the measured rate of the steam supply was 7.1kg / s when the net rate of work output was 5000Kw. The feed water was supplied to the boiler at a temp of 38 ° C, and the superheated steam leaving the boiler was at 1.4 Mpa and 300 ° C. Calculate the thermal efficiency of the cycle and the heat rate, what would be the heat rate when expressed in BTU of heat input per kWh of work output.
7. A bank of solar cells supplies power to a 95% efficient electric water heater. The area of the solar cell bank is 500 ft. The solar cell bank has a maximum theoretical efficiency of 31% and receives an incident solar flux of 150 W/m2. The heater boils water to make saturated steam at 30 psig to supply a turbine. Feedwater enters the boiler as saturated liquid at 140 deg.F. Calculate the total power in the bank. A. 7370 Btu/hr C. 7040 Btu/hr B. 7004 Btu/hr D. 7800 Btu/hr
1.) Calculate the difference between the Heat Added to the Boiler and Heat Rejected from the condenser in Hp if the feedwater is supplied at a rate of 0.74 short ton for a third of an hour at 24 hours operation. The feedwater pump pressure is 74 bar from a condenser pressure of 74 kPa. Also determine the over-all cycle efficiency if the temperature of the steam entering the turbine is 740 degrees Celsius.
The following data for the R-12 refrigeration system as shown are as follows: Evaporator 1 0 OC 30 TOR Evaporator 2 -10OC 20 TOR Evaporator 3 -20OC 10 TOR Condenser 20OC Assume simple saturation and isentropic compression and determine the following: a) Draw the h-s diagram b) The refrigerant flow in each evaporator c) Total work of compression, WC in kW d) Heat rejected in the condenser, QR in kj/min e) Coefficient of performance
A split air conditioner is used to heat an office in winter and cool it in summer.For this purpose, a split air conditioner with a cooling power of 1200 Btuh (3.5 kw) is used for the office. The power drawn by the split air conditioner is 1.2 kw accordingly. a) COP value b) If the outdoor temperature of the air conditioner is kept 22 C in summer, calculate the limit values for heating and cooling COP if the outdoor temperature in summer is 42C and the outside temperature in winter is -6C
In a test of cycle steam power plant, the measured rate of the steam supply was 7.1kg/s when the net rate of work output was 5000Kw. The feed water was supplied to the boiler at a temp of 38 0C, and the superheated steam leaving the boiler was at 1.4 Mpa and 3000C. Calculate the thermal efficiency of the cycle and the heat rate, what would be the heat rate when expressed in BTU of heat input per kWh of work output. Ans [24.44%,13955 BTU/kwh]
Q3] Consider a combined gas-steam power cycle as shown in the following figure. The gas turbine cycle has a pressure ratio of 7. Air enters the compressor at 27°C at a rate of 12 kg/s and at the gas turbine at 1027°C. The heat rate transferred at the heat exchanger is 5300 KJ/s. The steam leaving the pump is saturated water at 20 bar and enter the steam turbine as a saturated steam. Determine: 1- The air temperature at point 5 2- Work done by the compressor in KJ/kg. 3- Work done by the gas turbine in KJ/kg. 4- Flow rate of the steam in kg/s. 5- If the work produced by the steam turbine is 0.3 of that produced by gas turbine, determine the overall efficiency (ignore the pump work). 2 Comp. 1 47 Pump 40 6 C.C 3 Heat Exchanger 5 Condenser 4 9 8 4 ST GT 4
Thermal efficiency of a power cycle is 0.8. For the cycle, Wnet = 250 kJ. Determine Qout in kJ.

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