A Carnot device operates between a cold reservoir of temperature -95'C and a hot reservoir of temperature 260°C. Hint 1. If the device operates as a heat engine, what is its efficiency? eff= 2. If the device operates as a heat pump, what is its coefficient of performance? K = 3. Which of the statements below most correctly distinguish between a heat engine and a heat pump? O While heat engines can be constructed with irreversible processes, heat pumps can only be constructed with reversible processes. Heat engine operates more efficiently with a large temperature difference; heat pump also operates with higher performance with a large temperature difference. O Heat engine operates more efficiently with a large temperature difference; heat pump operates with higher performance with a small temperature difference. O The efficiency of a heat engine and the performance of a heat pump both are likewise independent of temperature differences.
A Carnot device operates between a cold reservoir of temperature -95'C and a hot reservoir of temperature 260°C. Hint 1. If the device operates as a heat engine, what is its efficiency? eff= 2. If the device operates as a heat pump, what is its coefficient of performance? K = 3. Which of the statements below most correctly distinguish between a heat engine and a heat pump? O While heat engines can be constructed with irreversible processes, heat pumps can only be constructed with reversible processes. Heat engine operates more efficiently with a large temperature difference; heat pump also operates with higher performance with a large temperature difference. O Heat engine operates more efficiently with a large temperature difference; heat pump operates with higher performance with a small temperature difference. O The efficiency of a heat engine and the performance of a heat pump both are likewise independent of temperature differences.
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Transcribed Image Text:A Carnot device operates between a cold reservoir of
temperature -95 C and a hot reservoir of temperature
260°C.
Hint
1. If the device operates as a heat engine, what is its
efficiency?
eff=
2. If the device operates as a heat pump, what is its
coefficient of performance?
K =
3. Which of the statements below most correctly
distinguish between a heat engine and a heat pump?
O While heat engines can be constructed with
irreversible processes, heat pumps can only be
constructed with reversible processes.
O Heat engine operates more efficiently with a
large temperature difference; heat pump also
operates with higher performance with a large
temperature difference.
Heat engine operates more efficiently with a
large temperature difference; heat pump
operates with higher performance with a small
temperature difference.
The efficiency of a heat engine and the
performance of a heat pump both are likewise
independent of temperature differences.
Transcribed Image Text:In an isothermal reversible expansion at 43°C, an ideal gas
does 25 J of work. What is the entropy change of the gas?
Hint
AS
J/K. (Use the
sign to indicate whether entropy of reservoir increases or
decreases.)
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