(1)Refrigerant R-134a that has an initial volume of 1220 L at 320 kPa with a quality of 91 percent is contained in a spring-loaded piston-cylinder device. This refrigerant is then heated until the pressure rises to 500 kPa and the temperature reaches 150°C. The total amount of heat transfer during this process is:

(1)Refrigerant R-134a that has an initial volume of 1220 L at 320 kPa with a quality of 91 percent is contained in a spring-loaded piston-cylinder device. This refrigerant is then heated until the pressure rises to 500 kPa and the temperature reaches 150°C. The total amount of heat transfer during this process is:

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 Piston-Cylinder system initially contains R-134a refrigerant at a temperature of 2.8 bar and 40°C and an initial volume of 0.1 m3. First, heat is transferred to the system by keeping the piston constant and this process is continued until the pressure is 3.2 bar. The process is then maintained by allowing the volume to change while the pressure is kept constant. At the end of this process, the temperature reaches 50°C. Assuming the state changes as if they are balanced,calculate;a) The mass of R-134a refrigerant in the system,b) The amount of heat transferred during the fixed volume process,c) The amount of heat transferred during constant pressure operation.d) Show the state changes on the P-v diagram.
One kg of superheated steam is at 400 kPa and 400°C. Heat is added to raise the temperature to 500°C. Find the amount of heat needed (kJ) if: (a) The volume of the steam is kept constant during the heating. (b) The steam is allowed to expand during the heating (e.g., in a piston/cylinder system) such that the pressure is constant. Hint: The steam is not an ideal gas under these conditions.
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The water was heated up until the temperature is 200C. At this time, a pressure regulating valve installedat the top of the piston was activated which allowed the escape of saturated vapor at the same pressure.The application of heat was continued until the water quality is 100%. Determine the total heattransferred to the system in this experiment.
Consider a rigid container which contains 3 kg of an ideal gas at 300 kPa and 50°C. Yesconnected to the container is a valve, which, when opened, lets out half of the mass of the container.gas, if the final pressure in the container is 220kPa, the final temperature in °C is:
(1) Water that has an initial volume of 140 L at 70°C with a quality of 28 percent is contained in a spring-loaded piston-cylinder device. This water is then heated until the pressure rises to 400 kPa and the temperature reaches 1100°C. The total amount of heat transfer during this process is:
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R-134a is a refrigerant, which is used inside of refrigerators and air conditioners. You can buy canisters of this as a compressed liquid, which can be used to recharge a leaky air conditioner. The canister initially contains 0.539 kg of R-134a at room temperature (25 °C). For simplicity, let's assume that the R-134a is initially saturated liquid. You use this canister to recharge an air conditioner, until the canister has half of its original mass remaining. The canister is upright with the exit on the top of the canister, so the exit flow is saturated vapor. In order to maintain the temperature at 25 °C, how much heat must be supplied to the canister? Note that this is why compressed liquid/gas canisters feel cold when you use them – they require heat - input to maintain constant T.
There are 0.449 kg/s 9f gas (R = 450 J /kg-K, k=1.32) undergo a non flow isometric process from P1= 550 kpa and t1 = 50°C to P2= 1800kPa. During the process, the gas is internally stirred, and 150 kJ/s of heat is added. Determine the work input in hp.
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