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For the two cycles, A and B. shown in the figure, which of the statements are...
Problem 1: Two reversible refrigeration cycles are arranged in series. The first cycle receives energy by...
Problem 1: Two reversible refrigeration cycles are arranged in series. The first cycle receives energy by heat transfer from a cold reservoir at temperature Tc and rejects energy by heat transfer to a reservoir at an intermediate temperature T greater than Te. The second cycle receives energy by heat transfer from the reservoir at temperature T and rejects energy by heat transfer to a higher-temperature reservoir at TH. Obtain an expression for the coefficient of performance of a single reversible...
1. Two power cycles are shown to the same scale in the figure below. Each consists...
1. Two power cycles are shown to the same scale in the figure below. Each consists of a sequence of internally reversible processes. T 17 S S Case a Case b a. Which cycle has the greater total (not net) heat input? Explain and justify your answer using appropriate analysis/equations. b. Which cycle has the greater thermal efficiency? Explain and justify your answer using appropriate analysis/equations.
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...
1. The exergy change of a system can be a) Only positive during a process b)...
1. The exergy change of a system can be a) Only positive during a process b) Only negative during a process c) Positive or negative during a process d) None of the above 2. Which of the following air standard heat engine cycles can have a 100% second law efficiency a) Otto cycle b) Ericsson cycle c) Diesel cycle d) Brayton cycle 3. Both energy and exergy can be transferred by a) Heat and work b) Mass and heat c)...
I only need C and D please! As shown in the figure below, a reversible power...
I only need C and D please!
As shown in the figure below, a reversible power cycle receives energy OH by heat transfer from a hot reservoir at TH and rejects energy a) If T 600 K and Tc-400 K, what is the thermal efficiency (b) If TH -500°C, Tc-20°C, and Wcydle 1800 kJ, what are Qn and Qc, each in k? (c) If η-50% and Te-40.-F, what is T., in of? (d) In-40% and TH-727"C, what is To in°C?
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...
As shown in the figure, a reversible power cycle receives energy QH by heat transfer from...
As shown in the figure, a reversible power cycle receives energy
QH by heat transfer from a hot reservoir at TH and rejects energy
QC by heat transfer to a cold reservoir at TC.
a) If TH = 1600 K, TC = 400 K, what is the thermal
efficiency?
b) If TH = 500oC, TC = 20oC, and Wcycle = 1000 kJ, what are QH and
QC, each in kJ?
c) If ? = 60% and TC = 40oF, what...
Which of the following statements are true? (multiple answers are possible) A. The thermal efficiency of...
Which of the following statements are true? (multiple answers are possible) A. The thermal efficiency of an irreversible heat engine is equal to the thermal efficiency of an equivalent Carnot heat engine. B. The thermal efficiency of an irreversible heat engine is less than the thermal efficiency of an equivalent Carnot heat engine. C. The thermal efficiency of an irreversible heat engine is greater than the thermal efficiency of an equivalent Carnot heat engine. D. The COP of an irreversible...
For parts a) through e), consider the two power cycles shown in the diagram at the...
For parts a) through e), consider the two power cycles shown in the diagram at the right, Cycle A: 1-2-3-4, and Cycle B: 1-2-3-4'. a) (2pts) Which of the two cycles has a higher thermal efficiency? b) (2pts) Which of the two cycles has a higher turbine outlet quality? c) (2pts) Are the cycles shown reversible or irreversible? d) (2pts) For either cycle, would superheating the vapor at state 1 increase or decrease the cycle efficiency? e) (2pts) For either...
please answer these questions 1. What is the difference between a refrigerator and a heat pump?...
please answer these questions 1. What is the difference between a refrigerator and a heat pump? 2. A heat pump and a refrigerator are operating between the same two thermal reservoirs. Which one has a higher COP? 3. Define the COP of a heat pump. 4. Thermal efficiency of a heat engine is defined to be the ratio of energy output desirable to energy input. Would you think that efficiency is an appropriate definition to be used when a heat...
Problem 1: Two reversible refrigeration cycles are arranged in series. The first cycle receives energy by heat transfer from a cold reservoir at temperature Tc and rejects energy by heat transfer to a reservoir at an intermediate temperature T greater than Te. The second cycle receives energy by heat transfer from the reservoir at temperature T and rejects energy by heat transfer to a higher-temperature reservoir at TH. Obtain an expression for the coefficient of performance of a single reversible...
1. Two power cycles are shown to the same scale in the figure below. Each consists of a sequence of internally reversible processes. T 17 S S Case a Case b a. Which cycle has the greater total (not net) heat input? Explain and justify your answer using appropriate analysis/equations. b. Which cycle has the greater thermal efficiency? Explain and justify your answer using appropriate analysis/equations.
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...
1. The exergy change of a system can be a) Only positive during a process b) Only negative during a process c) Positive or negative during a process d) None of the above 2. Which of the following air standard heat engine cycles can have a 100% second law efficiency a) Otto cycle b) Ericsson cycle c) Diesel cycle d) Brayton cycle 3. Both energy and exergy can be transferred by a) Heat and work b) Mass and heat c)...
I only need C and D please!
As shown in the figure below, a reversible power cycle receives energy OH by heat transfer from a hot reservoir at TH and rejects energy a) If T 600 K and Tc-400 K, what is the thermal efficiency (b) If TH -500°C, Tc-20°C, and Wcydle 1800 kJ, what are Qn and Qc, each in k? (c) If η-50% and Te-40.-F, what is T., in of? (d) In-40% and TH-727"C, what is To in°C?
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...
As shown in the figure, a reversible power cycle receives energy
QH by heat transfer from a hot reservoir at TH and rejects energy
QC by heat transfer to a cold reservoir at TC.
a) If TH = 1600 K, TC = 400 K, what is the thermal
efficiency?
b) If TH = 500oC, TC = 20oC, and Wcycle = 1000 kJ, what are QH and
QC, each in kJ?
c) If ? = 60% and TC = 40oF, what...
Which of the following statements are true? (multiple answers are possible) A. The thermal efficiency of an irreversible heat engine is equal to the thermal efficiency of an equivalent Carnot heat engine. B. The thermal efficiency of an irreversible heat engine is less than the thermal efficiency of an equivalent Carnot heat engine. C. The thermal efficiency of an irreversible heat engine is greater than the thermal efficiency of an equivalent Carnot heat engine. D. The COP of an irreversible...
For parts a) through e), consider the two power cycles shown in the diagram at the right, Cycle A: 1-2-3-4, and Cycle B: 1-2-3-4'. a) (2pts) Which of the two cycles has a higher thermal efficiency? b) (2pts) Which of the two cycles has a higher turbine outlet quality? c) (2pts) Are the cycles shown reversible or irreversible? d) (2pts) For either cycle, would superheating the vapor at state 1 increase or decrease the cycle efficiency? e) (2pts) For either...
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