A closed system receives heat at a rate of 2.6 kW from a source at 1020...
A closed system receives heat at a rate of 2.6 kW from a source at 1020 K , electrical power at a rate of 2.0 kW , and shaft power at a rate of 2.2 kW .
1-Determine the net rate of energy transfer. KW
2- Determine the net rate of exergy transfer into the system. KW
3- What is the maximum possible rate of exergy rise in the system? kW
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A closed system receives heat at a rate of 2.6 kW from a source
at 1020...
A source of heat at 1000 K transfers 1000 kW of power to a power generation...
A source of heat at 1000 K transfers 1000 kW of power to a power generation device, while producing 300 kW of useful work. Determine: a. The rate of exergy destruction in this process, if the atmosphere is at 300K. The second law efficiency of the system. b.
Solve the following problem in Thermodynamics: Carnot Cycle A heat engine receives heat from a source...
Solve the following problem in Thermodynamics: Carnot Cycle A heat engine receives heat from a source at 2000 K at a rate of 500 kW, and rejects the waste heat to a medium at 300 K. The net output from the engine is 300 kW. Determine the maximum energy that can be driven out of the engine theoretically using Carnot Cycle. Compare the observed work-efficiency with the expected efficiency of the heat engine? How much energy is lost due to...
A heat pump cycle whose coefficient of performance is 2.5 delivers energy by heat transfer to a dwelling at a rate of 20 kW.
Problem 2) A heat pump cycle whose coefficient of performance is 2.5 delivers energy by heat transfer to a dwelling at a rate of 20 kW. (a) Determine the net power required to operate the heat pump, in kW. (b) Evaluating electricity at $0.08 per determine the cost of electricity in a month when the heat pump operates for 200 hours. Problem 3) A power cycle receives energy by heat transfer from the combustion of fuel at a rate of 300 MW. The thermal efficiency...
QUESTION 1 A heat pump extracts heat from a cold temperature reservoir at 263 K at...
QUESTION 1 A heat pump extracts heat from a cold temperature reservoir at 263 K at high temperature reservoir, an auditorium, at 298 K. The heat pump requires (a) Draw a schematic diagram of the heat pump a rate of Q, and rejects 8 kW of heat to a an input power of 2.5 kw system and the reservoirs and show all energies and their values and directions on the diagram. ing an energy balance on the system, determine the...
A closed chamber containing a gas is at steady state. The shaft transfers power at a...
A closed chamber containing a gas is at steady state. The shaft
transfers power at a rate of W˙sh,in= 2.0 kW to the paddle
wheel and the electric lamp consumes electricity at a rate of
W˙el,in= 700 W .
A) Using an energy balance determine the rate of heat transfer,
in kW.
B) If the surface temperature of the chamber is 430 K ,
determine the entropy generated within the chamber, in kW/k
C) What would the entropy generation within...
In stationary state operation, a transmission box receives 60 kW for the input arrow and powers...
In stationary state operation, a transmission box receives 60 kW
for the input arrow and powers the output arrow. The box loses
energy by heat transfer at a rate defined by Newton's Cooling Law
of Q = hA (Tb-Tf), where h = 0.171 kW / m2 * K, A = 1m2 is the
surface area of the box, Tb = 300K is the external temperature and
Tf = 20ºC is the surrounding air temperature, evaluate the power
obtained from the...
Question 1 During steady state operation, a gear box receives 60kW through the input shaft and...
Question 1 During steady state operation, a gear box receives 60kW through the input shaft and delivers power through the output shaft. For the gearbox as the system, the rate of energy transfer by convection is given by Q=-hA(Tb - T) Where h 0.171kW/m2.k is the heat transfer coefficient, A=1.0m2 is the outer surface are of the gearbox. Tb 300k is the temperature at the outer surface and T 293 K is the temperature of the surrounding air. For the...
A power cycle receives energy QH from a high temperature energy source at TH and rejects...
A power cycle receives energy QH from a high temperature energy source at TH and rejects energy QL by heat transfer to a low temperature energy sink at TL = 400 K. For each of the following cases determine whether the cycle operate reversibly, irreversibly, or is impossible. (a) QH = 1200 kJ, Wcycle = 1020 kJ. (b) QH = 1200 kJ, QL = 240 kJ. (c) Wcycle = 1400 kJ, QL = 600 kJ. (d) ?=40%.
Analyzing Thermodynamic CyclesThe refrigerator shown in Fig. P2.87 steadily receives a power input of 0.15 kW while...
Analyzing Thermodynamic CyclesThe refrigerator shown in Fig. P2.87 steadily receives a power input of 0.15 kW while rejecting energy by heat transfer to the surroundings at a rate of 0.6 kW. Determine the rate at which energy is removed by heat transfer from the refrigerated space, in kW, and the refrigerator’s coefficient of performance.Fig. P2.87
21 A Carnot heat engine receives heat from a reservoir at 700°C at a rate of...
21 A Carnot heat engine receives heat from a reservoir at 700°C at a rate of 6 MW and rejects the waste heat to the ambient at 300 K, as shown in the figure. The entire net power output of the heat engine is used to drive a Carnot refrigerator that removes heat from the cold medium at -10°C and transfers it to the same ambient at 300 K. Determine:35235333333 a) The thermal efficiency of the heat engine. b) The...
A source of heat at 1000 K transfers 1000 kW of power to a power generation device, while producing 300 kW of useful work. Determine: a. The rate of exergy destruction in this process, if the atmosphere is at 300K. The second law efficiency of the system. b.
Solve the following problem in Thermodynamics: Carnot Cycle A heat engine receives heat from a source at 2000 K at a rate of 500 kW, and rejects the waste heat to a medium at 300 K. The net output from the engine is 300 kW. Determine the maximum energy that can be driven out of the engine theoretically using Carnot Cycle. Compare the observed work-efficiency with the expected efficiency of the heat engine? How much energy is lost due to...
QUESTION 1 A heat pump extracts heat from a cold temperature reservoir at 263 K at high temperature reservoir, an auditorium, at 298 K. The heat pump requires (a) Draw a schematic diagram of the heat pump a rate of Q, and rejects 8 kW of heat to a an input power of 2.5 kw system and the reservoirs and show all energies and their values and directions on the diagram. ing an energy balance on the system, determine the...
A closed chamber containing a gas is at steady state. The shaft
transfers power at a rate of W˙sh,in= 2.0 kW to the paddle
wheel and the electric lamp consumes electricity at a rate of
W˙el,in= 700 W .
A) Using an energy balance determine the rate of heat transfer,
in kW.
B) If the surface temperature of the chamber is 430 K ,
determine the entropy generated within the chamber, in kW/k
C) What would the entropy generation within...
In stationary state operation, a transmission box receives 60 kW
for the input arrow and powers the output arrow. The box loses
energy by heat transfer at a rate defined by Newton's Cooling Law
of Q = hA (Tb-Tf), where h = 0.171 kW / m2 * K, A = 1m2 is the
surface area of the box, Tb = 300K is the external temperature and
Tf = 20ºC is the surrounding air temperature, evaluate the power
obtained from the...
Question 1 During steady state operation, a gear box receives 60kW through the input shaft and delivers power through the output shaft. For the gearbox as the system, the rate of energy transfer by convection is given by Q=-hA(Tb - T) Where h 0.171kW/m2.k is the heat transfer coefficient, A=1.0m2 is the outer surface are of the gearbox. Tb 300k is the temperature at the outer surface and T 293 K is the temperature of the surrounding air. For the...
Analyzing Thermodynamic CyclesThe refrigerator shown in Fig. P2.87 steadily receives a power input of 0.15 kW while rejecting energy by heat transfer to the surroundings at a rate of 0.6 kW. Determine the rate at which energy is removed by heat transfer from the refrigerated space, in kW, and the refrigerator’s coefficient of performance.Fig. P2.87
21 A Carnot heat engine receives heat from a reservoir at 700°C at a rate of 6 MW and rejects the waste heat to the ambient at 300 K, as shown in the figure. The entire net power output of the heat engine is used to drive a Carnot refrigerator that removes heat from the cold medium at -10°C and transfers it to the same ambient at 300 K. Determine:35235333333 a) The thermal efficiency of the heat engine. b) The...
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