A domestic refrigerator sits in a kitchen, switched on, with the refrigerator door wide open.The kitchen itself is well insulated and it can be assumed no heat can escape or enter the kitchen from the outside.Which of the following is the most accurate statement.The temperature in the kitchen will go down very slightly.b. The temperature in the kitchen could go up or down, depending on the Coefficient of Performance (COP) of the refrigerator.The temperature in the kitchen will stay the same.O d. The temperature in the kitchen could go up or down depending on the mechanical efficiency of the compressor.Oe. The temperature in the kitchen will go up very slightly.

The answer is letter b. Explanation:Refrigerator is one of example of refrigeration system, so the…

Answered: A domestic refrigerator sits in a…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A domestic refrigerator sits in a kitchen, switched on, with the refrigerator door wide open. The kitchen itself is well insulated and it can be assumed no heat can escape or enter the kitchen from the outside. Which of the following is the most accurate statement. а. The temperature in the kitchen will stay the same. O b. The temperature in the kitchen could go up or down depending on the mechanical efficiency of the compressor. O c. The temperature in the kitchen will go down very slightly. d. The temperature in the kitchen could go up or down, depending on the Coefficient of Performance (COP) of the refrigerator. е. The temperature in the kitchen will go up very slightly.
27. If the system shown below is used to run a refrigerator, which of the following is true for the x to z step? pressure volume y Z A. The work is negative and heat is added to the system B. The work is positive and heat is added to the system C. The work is negative and heat is removed from the system D. The work is positive and heat is removed from the system 28. Refer to the y to z step in the PV diagram of the previous question. If heat was added to the system, which of the following must also be true? A. W 0 C. W = 0, and AU = 0 D. W = 0, and AU 0, and AU = 0
Which of the following are correct and valid for the Kelvin-Plank statement? O a. Any device O b. Kelvin- Planck O c. It is possible for any O d. No heat engine can have a thermal O e. Kelvin- Planck O f. It is impossible O g. It is impossible for any device O h. It is impossible that statement statement to construct to construct of the second law is device that a device that a device that violates of the efficiency of 100 second law is the that operates in a cycle and produces no effect other than Kelvin- operates in a cycle and produces no effect other than operates negative statement, and a operates on a cycle to receive heat from a single reservoir Planck percent, or as for a positive statement, and a positive on a cycle to receive heat statement power plant to operate, the working fluid also violates negative statement the from a statement the transfer the transfer single reservoir and Clausius cannot be can be of heat from and of heat from a lower- temperature body to a higher-…
A metal cylinder is filled with a room temperature perfect gas at 1 atm of pressure; upon pulling on the piston the gas is expanded. The gas of course initially cools, but then warms back to room temperature since it is in a non-insulating metal cylinder.a. What is the net ΔU and why? b. While still pulling on the piston after it warmed to room temperature, I wrap it in insulating glass wool to make the system adiabatic. Then I suddenly stop pulling on it. As no heat can be exchanged with the outside, tell me if the the piston will expand, compress, or stay the same and why?
Need a cancellation method. Thermodynamics
A house is heated and maintained at 20 °C by a heat pump. Part A Part B Based on these results, would you recommend heat pumps at locations with a severe climate? Match the words in the left column to the appropriate blankes in the sentences on the right. Reset Help mild 1. Given that a real heat pump is significantly efficient than a Carnot heat pump, the increases advantage of a heat pump over electric heating rapidly when the outside temperature becomes really low. less more 2. As the COP decreases, the heating power decreases 3. A heat pump is ideal for a climate. severe Submit Request Answer
In an absorption refrigerator, the energy driving the process is sllPplied not as work, but as heat from a gas flame. (Such refrigerators commonly use propane as fuel, and are used in locations where electricity is unavailable. *) Let us define the following symbols, all taken to be positive by definition: Qf = heat input from flame Qe = heat extracted from inside refrigerator Qr = waste heat expelled to room Tf = temperature of flame Te temperature inside refrigerator Tr = room temperature Use the second law of thermodynamics to derive an upper limit on the COP, in terms of the temperatures Tf, Te, and Tr alone.
In an absorption refrigerator, the energy driving the process is sllPplied not as work, but as heat from a gas flame. (Such refrigerators commonly use propane as fuel, and are used in locations where electricity is unavailable. *) Let us define the following symbols, all taken to be positive by definition: Qf = heat input from flame Qe = heat extracted from inside refrigerator Qr = waste heat expelled to room Tf = temperature of flame Te temperature inside refrigerator Tr = room temperature Explain why the "coefficient of performance" (COP) for an absorption refrigerator should be defined as Qc/Qf.
Which of the following are correct and valid for the Kelvin-Plank statement? Oc Any device O a. It is impossible for any device O e. It is possible for any O b. It is impossible O d. No heat engine can have a Of. Kelvin- Planck Og. Kelvin- O h. It is impossible Planck that statement of the to construct statement to construct a device that of the a device that violates thermal device that the efficiency of 100 that second second Kelvin- Planck operates in a cycle and produces no effect other than operates in a cycle and produces no effect other than operates law is law is operates on a cycle to receive positive statement, and a percent, or as for a negative statement, and a on a statement also cycle to receive power plant to operate, the working fluid heat from violates a single reservoir and heat negative statement cannot be positive the transfer of heat from a higer- temperature body to a lower- the from a statement the transfer Clausius single reservoir and of heat from a lower- can…
select if true or false for the following questions 1. For a standard condenser in a refrigeration system, the thermal energy (in J) is equal to the mass (in kg) multiplied by the change in enthalpy across the condenser (in J/kg). 2. Consider a basic refrigeration cycle: Since it requires less work to compress a liquid than a vapor, the entire refrigeration process would work better if the compressor was replaced with a pump. All else being equal, increasing the mass-flow rate of refrigerant will increase the rate of heat transfer at the system’s evaporator. All of these (except, of course, the one labeled, “None of these.”) None of these.
Q\ Which of the following represents the first law of thermodynamics? Possible Answers: a. While melting, an ice cube remains at the same temperature b. The specific heat of an object explains how easily it changes temperatures c. After falling down the hill, a ball's kinetic energy plus heat energy equals the initial potential energy d. Two systems in equilibrium with a third system are in equilibrium with each other e. If a refrigerator is unplugged, eventually everything inside of it will return to room temperature.
When heat energy transfers through a liquid or gas, what is it called? Select one: a. Conduction b. Convection c. Radiation d. Induction

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