Chapter 5, Problem 5.21P

The Kelvin-Planck and Clausius statements of thermodynamics are equivalent.  In order to prove the equivalence, a heat-engine-refrigerator combined system is used as shown below. The system satisfies the following conditions, where QH and QL are known values. 1) Heat recieved by the heat engine from the source:  QH,HE=QH 2) Heat QH is completely converted into net work output from the heat engine: QH=Wnet 3) Heat recieved by the regrigerator from the sink:  QL,R=QL What is the thermal efficiency of the heat engine?__________     A. Wnet/QH=QH/QH=100%   B. QL/QH   C. QH/QL   D. (QH-QL)/QH

The Kelvin-Planck and Clausius statements of thermodynamics are equivalent.  In order to prove the equivalence, a heat-engine-refrigerator combined system is used as shown below. The system satisfies the following conditions, where QH and QL are known values. 1) Heat recieved by the heat engine from the source:  QH,HE=QH 2) Heat QH is completely converted into net work output from the heat engine: QH=Wnet 3) Heat recieved by the regrigerator from the sink:  QL,R=QL What is the heat exported to the source by the combined system, QH,sys?__________     A. QL   B. QH-QL   C. QH   D. QH+QL

The Kelvin-Planck and Clausius statements of thermodynamics are equivalent.  In order to prove the equivalence, a heat-engine-refrigerator combined system is used as shown below. The system satisfies the following conditions, where QH and QL are known values. 1) Heat recieved by the heat engine from the source:  QH,HE=QH 2) Heat QH is completely converted into net work output from the heat engine: QH=Wnet 3) Heat recieved by the regrigerator from the sink:  QL,R=QL What is the net work output by the combined system, Wnet,sys?__________     A. QL   B. QH-QL   C. QH   D. 0

The Kelvin-Planck and Clausius statements of thermodynamics are equivalent.  In order to prove the equivalence, a heat-engine-refrigerator combined system is used as shown below. The system satisfies the following conditions, where QH and QL are known values. 1) Heat recieved by the heat engine from the source:  QH,HE=QH 2) Heat QH is completely converted into net work output from the heat engine: QH=Wnet 3) Heat recieved by the regrigerator from the sink:  QL,R=QL Select the correct statement for this combined the system.__________     A. The system receives heat QL from the sink and transfer 100% of the heat QLto the source without any work input, which violates the Clausius statement.   B. The system receives heat QL from the sink and transfer 100% of the heat QLto the source without any work input, which violates the Kelvin-Planck Statement.   C. The system receives heat QL from the sink and transfer  QH-QL amount of heat to the source, which does not violate the…

Q1. Solve all parts Depicted in Fig. Q1 is an irreversible refrigerator whose compressor is powered by a reversible heat engine that operates between temperature extremes Thot = 473K and cold = 293 K. The refrigerator depicted uses a dichlorodifluoromethane refrigerant (Refrigerant 12) circulating by means of the compressor at mass flow rate = 0.15 kg/s. The other components of the refrigerator are two heat exchangers in the form of an evaporator and a condenser, and a throttle valve. Information recorded at the state points depicted in Fig. Q1 is as follows: State point 1: dryness fraction x₁ = 1 and temperature t₁ = 15 °C. State point 2: dryness fraction x2 = 0 and temperature t₂ = 15°C. State point 3: wet vapour at temperature t₁ = -20°C. State point 4: wet vapour at temperature t₁ = -20°C. (a) Determine the thermal efficiency NR of the reversible heat engine depicted in Fig. Q1, and consequently determine power -W4-1 supplied to the compressor given that the rate of heat supplied…

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As shown in Figure 2, Carnot Heat Engine (HE) working between temperatures T1 = 150 °C and T2= 4 °C. The engine drives Carnot Refrigerator (R) that works between T3= 52 ° C and T4= -4 "C. What is the ratio of Q3/Q1?

Consider the given equation U = RT(a+ T/Tc), which of the following expression gives the heat capacity of isochoric process? a.Ra+ 2RT/Tc b.R(a + T/Tc) c.Ra + R/Tc d.R(a + R /Tc)

Referring to the reversible heat pump cycle shown in the figure, p₁ = 14.7 lby/in². Pa = 34.7 lb/in², v₁ = 12.6 ft3/lb, v4 = 7.0 ft³/lb, and the gas is air obeying the ideal gas model. Step 1 Determine TH. in °R, and the coefficient of performance. Determine TH. in °R. TH= i Save for Later P4 °R PI V4 VI Ty Attempts: 0 of 4 used Submit Answer Activa Go to Se