A frictionless piston-cylinder device contains saturated liquid water at 40-psia pressure. Now 400 Btu of heat is transferred to waterfrom a source at 1000°F, and part of the liquid vaporizes at constant pressure. Determine the total entropy generated during thisprocess, in Btu/R.Btu/RThe total entropy generated during the process is

The pressure of the saturated liquid water P1 = 40 psiaThe amount of heat transferred Q = 400 BtuThe…

Answered: A frictionless piston-cylinder device…

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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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.
An insulated piston-cylinder device contains 0.5L of saturated liquid water at a constant pressure of 100 kPa. An electric resistance heater inside the cylinder is now turned on, and 1178.36 kJ of electrical work is transferred to the steam. Determine (a) the entropy change of the water during this process; (b) the entropy generation during this process? 1178.36 kJ M H₂O 100 kPa Sat. liquid
A thermostat-controlled 15-kW backup electric resistance heater turns on whenever necessary to keep the house at 22°C. Determine how long the electric heating system is on during this night and the amount of entropy generated during the night.

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