Q2. A heat pump cycle is operating reversibly between a warm reservoir at 20o C and...
Q2. A heat pump cycle is operating reversibly between a warm reservoir at 20o C and a cold reservoir at -5o C. A second heat pump cycle is also operating reversibly between a hot reservoir at 30o C and a cold reservoir whose temperature, TC, is unknown. Given that the coefficient of performance of the first heat pump cycle is twice that of the second cycle, determine TC (in o C).
Q3. You see a newspaper advertisement from an organization that claims it has designed a device that can operate as a power cycle in the North Atlantic ocean between the surface and a depth of 1000 m at an efficiency of 10%. Test this claim for a particular location in the North Atlantic where the surface waters are at 20o C and the waters at a depth of 1000 m have a temperature of 8o C. State clearly the assumptions involved in your investigation of the claim [Hint: What do you need to approximate the waters at the ocean surface and at a depth of 1000m as, in order to test the claimed efficiency?]
Homework Answers
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Q2. A heat pump cycle is operating reversibly between a warm
reservoir at 20o C and...
A power cycle operating between two thermal reservoirs receives energy QH by heat transfer from a...
A power cycle operating between two thermal reservoirs receives energy QH by heat transfer from a hot reservoir at TH = 2000 K and rejects energy QC by heat transfer to a cold reservoir at TC = 400 K. For each of the following cases determine whether the cycle operates reversibly, operates irreversibly, or is impossible. (a) QH = 1000 kJ, ƞ = 60% (b) QH = 1000 kJ, Wcycle = 850 kJ (c) QH = 1000 kJ, QC =...
SP3. A Carnot engine operating in reverse as a heat pump moves heat from a cold...
SP3. A Carnot engine operating in reverse as a heat pump moves heat from a cold reservoir at 7°C to a warmer one at 22°C. a) What is the efficiency of a Carnot engine operating between these two temperatures? b) If the Carnot heat pump releases 250 J of heat into the higher-temperature reservoir e co in each cycle, how much work must be provided in each cycle? c) How much heat is removed from the 7°C reservoir in each...
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...
Consider a heat pump that removes heat from a cold reservoir (such as the external ambient...
Consider a heat pump that removes heat from a cold reservoir (such as the external ambient air) and deposits it into a hotter reservoir (such as your living room). Let's suppose that the outside air is at a temperature of 5 degree C, typical of a cool day here in New York. Let's also suppose that your living room is at 20 degree C. (a) What is the maximum efficiency of a heat pump operating between these two temperatures? (b)...
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...
Thermo question A reversible power cycle and a reversible heat pump cycle operate between hot and...
Thermo question
A reversible power cycle and a reversible heat pump cycle operate between hot and cold reservoirs at temperature T_H = 1000 degree R and T_C respectively. If the thermal effciency of the power cycle is 60%, determine T_C, in degree R, and the coefficient of performance of the heat pump.
5.43 A refrigeration cycle operating between two reservoirs receives energy QC from a cold reservoir TC = 275 K and re...
5.43
A refrigeration cycle operating between two reservoirs receives energy QC from a cold reservoir TC = 275 K and rejects energy QH to a hot reservoir at TH = 315 K, For each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible: QC = 1000 kJ, Wcycle = 80 kJ. QC = 1200 kJ. QH = 2000 kJ. QH = 1575 kJ. Wcycle = 200 kJ. beta = 6.
E A heat pump operates on a reversed Carnot cycle with a COP of 7.7. If...
E A heat pump operates on a reversed Carnot cycle with a COP of 7.7. If it keeps a -pace at 25 C by consuming 9.6 kW of power. a. Determine the temperature of the reservoir from which the heat is absorbed, b. Determine the heating load provided by the heat pump. 6 Draw the energy flow diagram of the heat pump. d. Determine the actual COP if its irreversibility is 17 kW. e Determine the second law efficiency of...
(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.
SP3. A Carnot engine operating in reverse as a heat pump moves heat from a cold reservoir at 7°C to a warmer one at 22°C. a) What is the efficiency of a Carnot engine operating between these two temperatures? b) If the Carnot heat pump releases 250 J of heat into the higher-temperature reservoir e co in each cycle, how much work must be provided in each cycle? c) How much heat is removed from the 7°C reservoir in each...
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...
Consider a heat pump that removes heat from a cold reservoir (such as the external ambient air) and deposits it into a hotter reservoir (such as your living room). Let's suppose that the outside air is at a temperature of 5 degree C, typical of a cool day here in New York. Let's also suppose that your living room is at 20 degree C. (a) What is the maximum efficiency of a heat pump operating between these two temperatures? (b)...
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...
Thermo question
A reversible power cycle and a reversible heat pump cycle operate between hot and cold reservoirs at temperature T_H = 1000 degree R and T_C respectively. If the thermal effciency of the power cycle is 60%, determine T_C, in degree R, and the coefficient of performance of the heat pump.
5.43
A refrigeration cycle operating between two reservoirs receives energy QC from a cold reservoir TC = 275 K and rejects energy QH to a hot reservoir at TH = 315 K, For each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible: QC = 1000 kJ, Wcycle = 80 kJ. QC = 1200 kJ. QH = 2000 kJ. QH = 1575 kJ. Wcycle = 200 kJ. beta = 6.
E A heat pump operates on a reversed Carnot cycle with a COP of 7.7. If it keeps a -pace at 25 C by consuming 9.6 kW of power. a. Determine the temperature of the reservoir from which the heat is absorbed, b. Determine the heating load provided by the heat pump. 6 Draw the energy flow diagram of the heat pump. d. Determine the actual COP if its irreversibility is 17 kW. e Determine the second law efficiency of...
(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.
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