3. You are trapped in a completely insulated room at 25°C. In this room there is a refrigerator filled with plenty of refreshing beverages. How do you keep the temperature of the room at a minimum until help arrives?

Make a sketch: A flash drum is used to reduce the temperature of a butane stream. The butane enters the drum at 35oC and 400 bar.   Flashed butane vapor leaves the top of the drum and butane liquid leaves the bottom of the drum.  The flash drum operation must be controlled to achieve an outlet temperature for both streams of –10oC

3. In an adiabatic cooling tower 500 kg/min hot water, is to be cooled from 50°C to 35°C by using air with 25°C dry bulb temperature and 15°C wet bulb temperature. The air leaves the tower with 32°C dry bulb temperature and 85% relative humidity. a. Show the points of inlet and outlet air on the PSYCHROMETRIC chart given below. Read the followings: Absolute humidity and Relative humidity of the inlet air. Absolute humidity and wet bulb temperature of the exit air. b. Calculate the volumetric flow rate of the air used. c. Why do we use cooling towers in process plant?

A rigid insulated tank is divided into 2 equal compartments by athin rigid partition. One of the compartments contains air, assumedto be an ideal gas at 800 kPa and 300 K. The other compartment isunder a vacuum. The partition is suddenly broken and the air rushesinto the evacuated compartment. The tank pressure and temperatureeventually equilibrate. (a) define the system you will use and draw a labeled schematic.(b) write the energy balance for the system, making simplificationsas appropriate(c) what is the final temperature of the gas, K?(d) what is the final pressure, kPa?(e) To calculate the entropy change of the process, you need to definea reversible path from the initial state to the final state. What isthat path?(f) What is ∆ssys for the process.(g) To calculate the entropy change of the surroundings, you needto define a reversible path from the initial state to the final state.What is that path?(h) What is the entropy change of the surroundings. ∆ssurr(i) What is the total…