A reversible heat engine receives heat of 2000 kJ from a furnace at temperature of 600...
A reversible heat engine receives heat of 2000 kJ from a furnace at temperature of 600 0C and rejects waste heat into the house. The portion of work produced by this heat engine utilized to drive a reversible heat pump to warmup the same house during the winter. The house is to be maintained at 21 0C at all times even though outside temperature drops to -15 0C. If the net-work output of the combined heat engine and heat pump cycle is 360 kJ,
Determine the heat transfer to the heat pump and the total heat transfer to the house.
Re-determine (i) when the efficiency of the heat engine and the COP of the heat pump are each 40% of their maximum possible values.
Note: Draw a schematic of the combined heat engine and heat pump cycle involved, and list all the relative information on the figure.
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A reversible heat engine receives heat of 2000 kJ from a furnace
at temperature of 600...
EXAM 3B 1. The Carnot heat engine receives 6500 kJ/h of heat from a boiler at...
EXAM 3B 1. The Carnot heat engine receives 6500 kJ/h of heat from a boiler at 950 °C and rejects the waste heat to a well at 20°C. The produced power output of heat engine is fully used to operate the heat pump that draws the heat from the outdoor environment and transfers it to warm the house at the rate of 1100 kJ/min. If the house is maintained at 23°C, what is the lowest temperature of outdoor environment? (6...
A reversible power cycle whose thermal efficiency is 40% receives 50 kJ by heat transfer from a...
A reversible power cycle whose thermal efficiency is 40% receives 50 kJ by heat transfer from a hot reservoir at 600 K and rejects energy by heat transfer to a coldreservoir at temperature Tc. Determine the energy rejected in KJ
A heat engine that receives heat from a furnace at 1200 degrees C and rejects waste...
A heat engine that receives heat from a furnace at 1200 degrees C and rejects waste heat to a river at 20 degrees C has a thermal efficiency of 40 percent. Determine the second-law efficiency of this power plant. Show all work, including interpolation, and assumptions made. Please be neat.
A reversible power cycle whose thermal efficiency is 39% receives 50 kJ by heat transfer from a hot reservoir at 310oC...
A reversible power cycle whose thermal efficiency is 39% receives 50 kJ by heat transfer from a hot reservoir at 310oC and rejects energy by heat transfer to a cold reservoir at temperature TC. Determine the energy rejected, in kJ, and TC, in oC. Determine the entropy production for the cycle, σcycle, in kJ/K.
Operating in series are two reversible heat pumps. Heat transfer gives energy to the first cycle...
Operating in series are two reversible heat pumps. Heat transfer
gives energy to the first cycle from a cold reservoir at 105 K and
rejects energy by heat transfer to a reservoir at an intermediate
temperature T greater than 105 K. The second cycle receives energy
by heat transfer from the reservoir at T and rejects energy by heat
transfer to a higher-temperature reservoir at 1200 K. If the heat
pump cycles have the same co-efficient of performance, calculate:
Low...
(12 pts) A heat pump operating on a cyclic process receives heat from a reservoir at...
(12 pts) A heat pump operating on a cyclic process receives heat from a reservoir at 500°C and rejects the waste heat at a rate of 30 kW to the ambient air at 300 K. If the work output of the engine is 45 kw, determine if the cycle is possible, and if the cycle is reversible. Explain with calculations. Show calculations using both efficiency (Method 1) and Entropy generation (Method 2) analysis.
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...
8. A reversible engine, operating in a cycle, withdraws heat from a high temperature (T2=500 K)...
8. A reversible engine, operating in a cycle, withdraws heat from a high temperature (T2=500 K) and heat capacity (C2=20 + 0.001ⓇT [J/mole.k]) reservoir, performs work w, and rejects heat into a low-temperature (T1=300 K) and heat capacity (C=10+ 0.001XT [J/mole.k]) reservoir. Calculate the final temperature of the system and the maximum amount of work.
A heat pump is to be used to heat a house in winter and then reversed...
A heat pump is to be used to heat a house in winter and then
reversed to cool the house in summer. The interior space is to be
maintained at 20oC. Heat transfer through walls and roof is
estimated to be χ = 0.525 kJ/sec per degree difference in
temperature between inside and outside. (6a) (8p) In winter if the
outside temperature is 5oC, what is the minimum power required to
drive the heat pump? (6b) (12p) For the same...
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...
EXAM 3B 1. The Carnot heat engine receives 6500 kJ/h of heat from a boiler at 950 °C and rejects the waste heat to a well at 20°C. The produced power output of heat engine is fully used to operate the heat pump that draws the heat from the outdoor environment and transfers it to warm the house at the rate of 1100 kJ/min. If the house is maintained at 23°C, what is the lowest temperature of outdoor environment? (6...
Operating in series are two reversible heat pumps. Heat transfer
gives energy to the first cycle from a cold reservoir at 105 K and
rejects energy by heat transfer to a reservoir at an intermediate
temperature T greater than 105 K. The second cycle receives energy
by heat transfer from the reservoir at T and rejects energy by heat
transfer to a higher-temperature reservoir at 1200 K. If the heat
pump cycles have the same co-efficient of performance, calculate:
Low...
(12 pts) A heat pump operating on a cyclic process receives heat from a reservoir at 500°C and rejects the waste heat at a rate of 30 kW to the ambient air at 300 K. If the work output of the engine is 45 kw, determine if the cycle is possible, and if the cycle is reversible. Explain with calculations. Show calculations using both efficiency (Method 1) and Entropy generation (Method 2) analysis.
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...
8. A reversible engine, operating in a cycle, withdraws heat from a high temperature (T2=500 K) and heat capacity (C2=20 + 0.001ⓇT [J/mole.k]) reservoir, performs work w, and rejects heat into a low-temperature (T1=300 K) and heat capacity (C=10+ 0.001XT [J/mole.k]) reservoir. Calculate the final temperature of the system and the maximum amount of work.
A heat pump is to be used to heat a house in winter and then
reversed to cool the house in summer. The interior space is to be
maintained at 20oC. Heat transfer through walls and roof is
estimated to be χ = 0.525 kJ/sec per degree difference in
temperature between inside and outside. (6a) (8p) In winter if the
outside temperature is 5oC, what is the minimum power required to
drive the heat pump? (6b) (12p) For the same...
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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