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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** I mainly just need help with process 4-1. I do not remember PV constants well.
During a warm summer night, the air inside a house is maintained at a fixed temperaturevia an air conditioning system. Separating the inside air from the outside air is a plane wall.The inner surface of the wall exchanges energy with the air inside the house via convection;the outer surface of the wall exchanges energy with the surrounding air via convection andthe night sky via radiation. Known system parameters are listed below.Inner air temperature ?? = 26°CSurrounding air temperature ?∞ = 33°CNight sky temperature ?? = 4°CWall thermal conductivity ?Wall-air convection coefficient ℎ = 30 W/m2-KWall emissivity ? = 0.85Wall thickness ?a) Set up the equations that you allow you to calculate the heat flux through the wall.Keep everything symbolic and be careful with your heat transfer directions.Hint: If the AC is on, what does that tell you about the net direction of heat transfer?b) Write a computer script that calculates the heat flux through the wall for 20 values ofthe ratio of the…
Air treated as an ideal gas and having a specific heat at constant volume Cv-1200 J/kg.K undergoes a process. During this process, heat is observed to exit the system with an amount of 10 kJ while work is provided to the system with an amount of 22 kJ. If the initial temperature of air was 20 C, what is the final temperature of air if the mass of air undergoing the process is 0.4 Kg. Select one: a. 45 C b. 49.5 C c. 39.4 C d. 51.4 C
In the figure, two processes are shown in the Ts diagram: A and 8. Is the heat transferred in one of the processes greater? O a The heat transfterred is greater in process A. O b. The heat transferred is the same in both processes Oc Further information is missing to answer this. O d. The heat transferred is greater in process B.
This is one whole question can you please help me
The van der Waals (vdW) equation is a cubic equation of state (CEOS) which may be used to calculate the volume or pressure conditions for a real gas: P= a = RT a v-b v² Here, v represents the molar volume of the gas, and P, R, and T' are the absolute pressure, ideal gas constant, and absolute temperature of the gas, respectively. The values a and b are component dependent an may be calculated using: 27 R²T² 64 P C and b= 1 RT 8 Pc So, when both the critical pressure (Pc) and critical temperature (Tc) are known, one can apply the vdW CEOS to give a more accurate calculate more accurate properties than the ideal gas law. One must be careful to use absolute values for the pressure & temperature (e.g., unit of K not °C) and a value for the gas constant that is consistent with the unit desired (such as R = 0.0083144598 L·bar/K·mol) Do the following: a) Calculate the molar volume (L/mol) of nitrogen gas (Pc = 33.96 bar, Tc = 126.19 K) at 5 bar and 30°C using both the ideal gas law & using…
Please solve it fast in handwritten format
Instructions: Show solution step by step with Units. Please answer it in 1 hr. Subject: Thermodynamics Topic: Work and Heat
Q3: Consider evaluation of different temperatures of solar photovoltaic/thermal system (PVT) as shown in Figure 1(a). The following set of differential equations represent energy balance equations to be solve using matrices and eigenvalues dTglass = -0.75Tglass + 0.75TPVT (1) dt - 1.18Tglass – 22TpyT + 237wax (2) dt dTwax 12Tglass + 18TpyT – 19 Twax (3) dt Where, Tptass, TPVT, and Twax, are temperatures illustrated in Figure 1(b). At time t-0 the initial conditions are Tglass = 35 , Tpyr = 33, and Twax = 31 °C. Cold sappty In frem water Tank Glass PVT Enpann Nane-PCMPVT Collector Wax Tubes Sterg Tank Mat Nanofluid Heat Exchanger Tepe Contalner Tuek et Pump for drain
Please help and show work.
i need the answer quickly
Your house has an electric water heater. Several friends are visiting you over the weekend and they are taking consecutive showers. Assume that at the maximum heating level, the heater uses 50 kW of electricity. The water use rate is a continuous 4 gallons per minute with the new water saving showerhead you recently installed. Your very old showerhead had used 7 gallons per minute. You replaced the showerhead because you learned that heating water was the second highest energy use in your home. By slowing the flow of water through the heater, the water temperature should increase to a higher temperature. (a) What is the change in temperature (T) for the old showerhead? (b) What is the change in temperature (T) for the new showerhead? Assume the system is at steady sate, and all of the 50 kW energy used is heating the water.

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