1.1 Determine the electrical power supplied to a boiler when the temperature of the enteringwater is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is anegligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specificheat is c = 4,370 J/(Kg K). There is a 1.5(105) W rate of heat loss from the boiler during this process to asurrounding at 293.2 k. Consider steady state conditions.1.2 Calculate the total rate of entropy production in Problem 1.1.1.3 Calculate the total rate of exergy destruction (W) in Problem 1.1. The dead statetemperature is 293.2 K and pressure is 1 bar.1.4 Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to theconditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The highheating value (HHV) of the fuel is 50.02 MJ/kg.1.5 Calculate the exergy destroyed in the process described by problem 1.4. The exergy of the fuelentering this process is 51.82 MJ/Kg. The dead state temperature is 293.2 K and pressure is 1 bar. Theproducts of combustion leave this process at the dead state.1.6 The utility providing the electricity to the boiler in problem 1.1 uses the same fuel as that used inproblem 1.4 and has an efficiency of 0.35. The cost of the electric boiler is, $3,000 with a 15 year lifetime.The cost of the fuel based boiler system is $5000 and has a lifetime of 20 years. The fuel cost is $0.10/kgand the cost of electricity is $0.20/kWh. There is a tax charge of $0.50/kg of CO2 emission that is passedon to the user whether the utility based electrical system or gas fired system is used. The unit is used for 10hours per day, 280 days per year. Which process would you recommend in terms of fuel consumption,exergy production, carbon dioxide emission and theroeconomic cost? There is no cost associated with thewater input. Note the total amount of fuel consumed is directly related to the carbon dioxide emission fromeach process. Please answer 1.4, 1.5, 1.6 The last three sub parts Thank you
1.1 Determine the electrical power supplied to a boiler when the temperature of the entering
water is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is a
negligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specific
heat is c = 4,370 J/(Kg K). There is a 1.5(105
) W rate of heat loss from the boiler during this process to a
surrounding at 293.2 k. Consider steady state conditions.
1.2 Calculate the total rate of entropy production in Problem 1.1.
1.3 Calculate the total rate of exergy destruction (W) in Problem 1.1. The dead state
temperature is 293.2 K and pressure is 1 bar.
1.4 Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to the
conditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The high
heating value (HHV) of the fuel is 50.02 MJ/kg.
1.5 Calculate the exergy destroyed in the process described by problem 1.4. The exergy of the fuel
entering this process is 51.82 MJ/Kg. The dead state temperature is 293.2 K and pressure is 1 bar. The
products of combustion leave this process at the dead state.
1.6 The utility providing the electricity to the boiler in problem 1.1 uses the same fuel as that used in
problem 1.4 and has an efficiency of 0.35. The cost of the electric boiler is, $3,000 with a 15 year lifetime.
The cost of the fuel based boiler system is $5000 and has a lifetime of 20 years. The fuel cost is $0.10/kg
and the cost of electricity is $0.20/kWh. There is a tax charge of $0.50/kg of CO2 emission that is passed
on to the user whether the utility based electrical system or gas fired system is used. The unit is used for 10
hours per day, 280 days per year. Which process would you recommend in terms of fuel consumption,
exergy production, carbon dioxide emission and theroeconomic cost? There is no cost associated with the
water input. Note the total amount of fuel consumed is directly related to the carbon dioxide emission from
each process.
Please answer 1.4, 1.5, 1.6
The last three sub parts
Thank you
Trending now
This is a popular solution!
Step by step
Solved in 5 steps with 3 images
