27.If the system shown below is used to run a refrigerator, which ofthe following is true for the x to z step?pressurevolumeyZA. The work is negative and heat is added to the systemB. The work is positive and heat is added to the systemC. The work is negative and heat is removed from the systemD. The work is positive and heat is removed from the system28.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 alsobe true?A. W < 0, and AU = 0B. W = 0, and AU > 0C. W = 0, and AU = 0D. W = 0, and AU <0E. W > 0, and AU = 0

Here a diagram is given which representing refrigeration cycle. The direction of cycle is x to z. We…

Answered: If the system shown below is used to…

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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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.
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?
Write the simplified ENERGY BALANCE equation for each process based on the givenconditions. Start from the general energy balance form, and arrive at the correct balance byexplaining any addition, deduction, or change in the equation.Use the following as subscripts in your answer: 1 = initial system state; 2 = final system state; i = inletstate, e = exit state.a. A rigid tank transferring heat to its surroundings. b. The seal of an insulated system with a high energy substance is broken, causing the contents tobe evacuated until only 20% of the initial internal energy remained. No heat transfer was detectedin the system’s boundaries. c. Consider a hydroelectric power plant operating in steady conditions, wherein the system consistsof two water reservoirs with a height difference Δz, with a Francis water turbine placed betweenthe stream connecting both.
2) The following heating system for a room is considered: ATroom = K1 | Qodt, Qo = Qin - Qout Qout = K2AT,0om room Qin = K3(ATrad – ATr00m) where AT is the room temperature and AT is the radiator temperature. What is room rad the stationary room temperature, if the radiator temperature is 50C and if K1 = 104, K2 = 4, and K3 = 1? A. 40°C В. 20°C С. 10°C D. 30°C Е. None of the previous answers are correct.
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
Derive the 7 general property equation of the following thermodynamics processes: a. ISOMETRIC PROCESS
After graduation, you take a job with the Acme energy services company. Your first job is to purchase high efficiency heat pumps. The heat pumps employ mechanical power and a heat engine to provide heat at TH = 100°C. A low temperature heat sink at TC = 20ºC is also available. A salesman shows you two models. Performance data for each model operating at steady state are provided in the Figure below
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.
State if the listed statement is Ture (T) or False (F) and correct the false statement: 1. Thermodynamic is a science of energy 2. Closed system is also called control volume 3. Steam power plant cycle is employed to produce a mechanical and electrical energy 4. In a Carnot cycle, the isothermal process in a boiler and a condenser ( ) 5. Isobaric process means volume is constant 6. Isentropic process means adiabatic and reversible 7. Pump is a device that consumes energy 8. Compressor is a device that raises a pressure of incompressible fluid flow ( ) 9. Thermal efficiency means the output by input 10. Cycle means a group of process that has initial state and final state ( ) ( )
b) For an Otto Engine the temperature at the end of combustion is 280 K. If the temperature in the gas side and coolant side of the wall are 177 °C and 127 °C and cylinder wall thickness is 5 mm;
Derive the seven general property equation of the following thermodynamics processes: a. ISOMETRICPROCESS
54. What is the sign of convention for work done by the system on the surrounding.

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