32. In a hypothetical 350 MWe nuclear power plant, cold water enters the reactor, steam leaves the reactor to enter the turbine, and the hot water from the turbine is returned to a nearby lake. Use the given data to find a) the temperature of the wa- ter at the inlet and outlet of the core, b) the maximum available work, c) the gov- erning equation for the lake water temperature while ignoring any heat transfer by evaporation, and d) the plant lifetime based on the lake water temperature not ex-

32. In a hypothetical 350 MWe nuclear power plant, cold water enters the reactor, steam leaves the reactor to enter the turbine, and the hot water from the turbine is returned to a nearby lake. Use the given data to find a) the temperature of the wa- ter at the inlet and outlet of the core, b) the maximum available work, c) the gov- erning equation for the lake water temperature while ignoring any heat transfer by evaporation, and d) the plant lifetime based on the lake water temperature not ex-

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 8.19P

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Pls. Answer thank you! A cooling tower has an efficiency of 65%. Water enters the tower at 55°C. The wet bulb temperature of surrounding air is 27°C. What is the temperature of water leaving the tower?
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…
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…
Liquid octane enters an internal combustion engine operating at steady state with a mass flow rate of 0.004 lb/sand is mixed with the theoretical amount of air. The rate of heat transfer is 22.22 BTU/s. If the density of octane is 5.88 lb/gal, how many gallons of fuel would be used in 2 h of continuous operation of the engine?
Energy balance results (in kW) obtained for the same medium speed single cylinder diesel engine are reported in the following table. For case 1, if the coolant temperature is 105 °C at the outlet of the engine and the volumetric flow rate is 0.22*10-3 m3/s, the temperature of the coolant at the inlet is (in °C): (The coolant is considered water with a density 999 kg/m3 and a specific heat 4.2 k/kg.K). Case N (rpm) bmep (bar) W. O ambient Q ahast shaft 2.2 4.2 19.1 60.3 9.90 3.52 1 500 7.1 24.5 23.8 500 6.1 3.6 5.2 400 3.50 4.9 4.1 1.4 Select one: O a. 142.1 O b. 112.7 O c. 97.31 O d. 87.2 O e. 370.31
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. 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. 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. Asnwer: The…
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. 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. 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. I already figured…
You, a process design engineer, are tasked to build a powerplant with a net output of 1 MW. First, in an industrial boiler, coal is burned to heat and pressurize 1.6 kg/s of water pumped from an underground reservoir (25 oC, 1 atm) to High Pressure Steam (44 atm, 450 oC). The industrial boiler is insulated, but due to the high temperatures and the nature of the process there are inevitably heat losses. As such, the total heat losses of the whole system is around 20% of the heat from the coal. The High-Pressure Steam, moving at a linear velocity of 70 m/s, is then used to drive a turbine. The low pressure steam from the turbine is used to preheat the boiling water and then released to the atmosphere as saturated steam (100oC and1atm) at a velocity of 10 m/s via an exhaust 10 m above the turbine inlet. How much heat is needed for the powerplant? Use the following values of enthalpy: Water from reservoir 25oC; 1atm H=104.93 kJ/kg High Pressure Steam 450oC; 44atm H=3324.63 kJ/kg Low…
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give a specific example of a process that has the energy changes and transfers described. (For example, if the question states “ΔEth > 0, W = 0,” you are to describe a process that has an increase in thermal energy and no transfer of energy by work. You could write “Heating a pan of water on the stove.”) ΔEth < 0, W ≠ 0, Q ≠ 0
A fluid enters an apparatus at 480 ft/s, initially the pressureof the fluid is 120 psia, the specific volume of 5ft3/lb andthe internal energy is 383 BTU/lb. The fluid leaves theapparatus at 25psia, specific volume of 18 ft3/lb, an exitvelocity of 1200 ft/s and internal energy of 120 BTU/lb. Theheat radiation loss is 10 BTU/lb. Determine work steadyflow, WSF