Chapter 5, Problem 5.35P

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…

You have a refrigerator in your garage. Does it perform differently in the summer than in the winter?Explain.

A heat pump maintains a dwelling at 68°F. When operating steadily, the power input to the heat pump is 5 hp, and the heat pump receives energy by heat transfer from 55°F well water at a rate of 500 Btu/min. (a) Determine the coefficient of performance. (b) Evaluating electricity at $0.18 per kWh, determine the cost of electricity in a month when the heat pump operates for 300 hours. Part A Determine the coefficient of performance. y = i

A Carnot refrigerator is operating between cold reservoir of Temperature 35 degrees C and hot reservoirs of temperatures 209 degrees C. Calculate its coefficient of performance rounding your answer to two decimal points.

The figure below shows a Carnot engine driving a Carnot refrigerator. If the heat input is 100 Joules and the hot and cold reservoirs are at 500K and 100K respectively, answer the questions that follow. What is W (in Joules)? Express answer in THREE SIGNIFICANT FIGURES? What is the efficiency of the Carnot engine driving this Carnot refrigerator?

Choose the CORRECT relation between the Coefficient of Performance (CoP) for Refrigerator and Heat Pump? Select one: (CoP)Refrigerator = (CoP)Heat Pump + 1 o (CoP)Heat Pump = (CoP)Refrigerator + 1 o (CoP)Refrigerator + (CoP)Heat Pump o (CoP)Refrigerator = (CoP)Heat Pump 1 o (CoP) Refrigerator – (CoP) Heat Pump Clear my choice

A Carnot engine operates between temperature levels of 600 K and 300 K. It drives a Carnot refrigerator, which provides cooling at 250 K and discards heat at 300 K. Determine a numerical value for the ratio of heat extracted by the refrigerator (“cooling load”) to the heat delivered to the engine (“heating load”).

A refrigerator maintains the freezer compartment at -10°C when the air surrounding the refrigerator is at 25°C. The rate of heat transfer from the freezer compartment to the refrigerant is 10000 kJ/h and the power input required to operate the refrigerator is 1.5 hp. ● Determine the coefficient of performance of the refrigerator. ● Compare with the coefficient of performance to a Carnot refrigeration cycle operating between reservoirs at the same two temperatures.