How can net heat absorbed in a REVERSIBLE cycle be non-zero?
How can net heat absorbed in a REVERSIBLE cycle be non-zero?
Homework Answers
In reversible cycle there is 2 step workdone.
And the final stage is same as initial stage i.e same temperature volume and pressure. This indicated that there is no change in internal energy during complete cycle. It implies that to do work system must have absorved energy and then converted it into work. Hence net absorved heat will be non zero.
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. Find the quasi-static (reversible) work done and the net heat absorbed by the system40.00 in...
5. Find the quasi-static (reversible) work done and the net heat absorbed by the system40.00 in each of the following three processes, all of which take the system from state A to state B Please refer to the diagram on the right. The blue curve and the equation that refers to it are for an adiabatic process. a is a constant. 2.63. a) The system is expanded from its original to its final volume heat being added to maintain the...
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...
1. Consider a Carnot cycle where Th=1000. K and Tc=300. K. The heat absorbed, qh, is...
1. Consider a Carnot cycle where Th=1000. K and Tc=300. K. The heat absorbed, qh, is 200. kJ. What is the entropy change for the entire cycle? 2. Consider a Carnot cycle where Th=1000. K and Tc=300. K. The heat absorbed, qh, is 200. kJ. What is the entropy change for the adiabatic expansion? 3. Consider a Carnot cycle where Th=1000. K and Tc=300. K. The heat absorbed, qh, is 200. kJ. What is the entropy change during the isothermal...
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...
two reversible cycles arranged in series each produce the same net work As shown in Fig. P5.26, two reversible...
two
reversible cycles arranged in series each produce the same net work
As shown in Fig. P5.26, two reversible cycles arranged in series each produce the same net work. W The first cycle receives energy QB by heat transfer from a hot reservoir at 1000 degree R and rejects energy Q by heat transfer to a reservoir at an intermediate temperature, T. The second cycle receives energy Q by heat transfer from the reservoir at temperature T and rejects energy...
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 thermodynamic cycle consists of the following reversible processes: 1-2 isothermal expansion 2-3 isentropic compression 3-1 heat rejection at constant pressure The cycle works with 1.5 kg of water v...
A thermodynamic cycle consists of the following reversible processes: 1-2 isothermal expansion 2-3 isentropic compression 3-1 heat rejection at constant pressure The cycle works with 1.5 kg of water vapor. State 1 is dry saturated steam at 200 ° C; state 2 has a pressure of 100 kPa. Determine: a) The addition of heat, b) the net work, and c) the entropy change from 1 to 2.
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.
11. A reversible heat engine uses a three-step cycle consisting of an isothermal expansion at temperature...
11. A reversible heat engine uses a three-step cycle consisting of an isothermal expansion at temperature Ti, a constant volume cooling to temperature T2, and adiabatic compression back to the initial state. (a) Sketch the P-V diagram (b) If 1 mole of a van der Waals gas is used the working material, the efficiency of this engine is defined to be E = Suppose that the heat capacity of gas is independent of temperature. Show that the efficiency of the...
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. Find the quasi-static (reversible) work done and the net heat absorbed by the system40.00 in each of the following three processes, all of which take the system from state A to state B Please refer to the diagram on the right. The blue curve and the equation that refers to it are for an adiabatic process. a is a constant. 2.63. a) The system is expanded from its original to its final volume heat being added to maintain the...
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...
two
reversible cycles arranged in series each produce the same net work
As shown in Fig. P5.26, two reversible cycles arranged in series each produce the same net work. W The first cycle receives energy QB by heat transfer from a hot reservoir at 1000 degree R and rejects energy Q by heat transfer to a reservoir at an intermediate temperature, T. The second cycle receives energy Q by heat transfer from the reservoir at temperature T and rejects energy...
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.
11. A reversible heat engine uses a three-step cycle consisting of an isothermal expansion at temperature Ti, a constant volume cooling to temperature T2, and adiabatic compression back to the initial state. (a) Sketch the P-V diagram (b) If 1 mole of a van der Waals gas is used the working material, the efficiency of this engine is defined to be E = Suppose that the heat capacity of gas is independent of temperature. Show that the efficiency of the...
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