Problem 236EUP

A rigid 35-ft3 tank contains water initially at 250 F, with 50% liquid and 50% vapor by volume. A pressure-relief valve on top of the tank is set to 150 lbf/in.2 (the tank pressure cannot exceed 150 lbf/in.2; water will be discharged instead). Heat is now transferred to the tank from a 400 F heat source until the tank contains saturated vapor at 150 lbf/in.2. Calculate the heat transfer to the tank and show that this process does not violate the second law.

METR. 121 Week 2 Notes 8/29/16 The Earth’s Atmosphere Lecture Continued Standard Atmosphere: 1013.25 mb Air circulates clockwise Atmosphere Structure: Temperature Radiosonde observing vertical distribution of temperature, humidity, pressure, and wind The “pauses” are called transitional layers Thermosphere: 90km to 500km O, N, and H atoms absorb solar radiation Move at fast speeds Temperature increases with height Mesopause Mesosphere: about 55km to 85km No heating in this layer Temperature decreases with height Stratopause