Q: A piston–cylinder device contains 5 kg of refrigerant 134a at
A piston–cylinder device contains 5 kg of refrigerant 134a at 800 kPa and 70°C. The refrigerant is now cooled at constant pressure until it exists as a liquid at 15°C. Determine the amount of heat los...
See AnswerQ: A piston–cylinder device contains 0.5 lbm of water
A piston–cylinder device contains 0.5 lbm of water initially at 120 psia and 2 ft3. Now 200 Btu of heat is transferred to the water while its pressure is held constant. Determine the final temperature...
See AnswerQ: 2 kg of saturated liquid water at 150°C is heated
2 kg of saturated liquid water at 150°C is heated at constant pressure in a piston–cylinder device until it is saturated vapor. Determine the heat transfer required for this process.
See AnswerQ: An insulated piston–cylinder device contains 5 L of saturated liquid
An insulated piston–cylinder device contains 5 L of saturated liquid water at a constant pressure of 175 kPa. Water is stirred by a paddle wheel while a current of 8 A flows for 45 m...
See AnswerQ: A 40-L electrical radiator containing heating oil is placed in
A 40-L electrical radiator containing heating oil is placed in a 50-m3 room. Both the room and the oil in the radiator are initially at 10°C. The radiator with a rating of 2.4 kW is now tur...
See AnswerQ: Steam at 75 kPa and 8 percent quality is contained in a
Steam at 75 kPa and 8 percent quality is contained in a spring-loaded piston–cylinder device, as shown in Fig. P5–37, with an initial volume of 2 m3. Steam is now h...
See AnswerQ: A piston–cylinder device initially contains 0.6 m3 of
A piston–cylinder device initially contains 0.6 m3 of saturated water vapor at 250 kPa. At this state, the piston is resting on a set of stops, and the mass of the piston is such that a pressure of 30...
See AnswerQ: An insulated tank is divided into two parts by a partition.
An insulated tank is divided into two parts by a partition. One part of the tank contains 2.5 kg of compressed liquid water at 60°C and 600 kPa while the other part is evacuated. The partit...
See AnswerQ: Calculate the total work, in kJ, for process 1–
Calculate the total work, in kJ, for process 1–3 shown in Fig. P5–4 when the system consists of 2 kg of nitrogen.
See AnswerQ: Reconsider Prob. 5–39. Using appropriate software, investigate
Reconsider Prob. 5–39. Using appropriate software, investigate the effect of the initial pressure of water on the final temperature in the tank. Let the initial pressure vary from 10...
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