A 400 ft3 tank of compressed helium is at a pressure of 55 psig and 15°C. It is connected to a smaller tank with a (closed) valve. The smaller tank has a volume of 50 ft3 and contains He at 1 atm (absolute) and the same temperature as the larger tank. If the connecting valve is opened and no temperature changes occur, what is the final pressure in the system (both tanks together).

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

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…

Thermodynamics question

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thermodynamics 1

A pressurized tank of water has a 10-cm diameter orifice at the side bottom corner of the tank, where the water is being discharge to the atmosphere. The water level is 3 meters above the orifice. The tank air pressure above the water level is 300 kPa. Neglecting frictional effects, the initial discharge rate of water in kilograms per second (kg/s) from the tank is

An adiabatic container with a total volume of 10 ft3 is initially evacuated. You would like to input air from a supply line, which runs at a temperature of 100oF and a pressure of 50 psia, by opening a valve that lets the air get into this container. Calculate the amount of air that you got in the container, in lbm. Can this happen? Assume constant heat capacities.

A steam turbine in a small electric power plant is designed to accept 4500 kg / hr of steam at 60 bar and 500oC and exhaust the steam at 10 bar. (a) Assuming that the turbine is adiabatic and has been very well designed, compute the power generated by the turbine. (b) In off-peak hours, the power output of the turbine is decreased by adjusting a throttling valve that reduces the turbine inlet steam pressure to 30 bar (see figure) while keeping the flow rate constant. Calculate the power output of the turbine.

A rigid tank has a volume of 0.01 m3 . It initially contains saturated water at a temperature of 200 o C and a quality of 0.4. The top of the tank contains a pressure regulating valve which maintains the vapor at constant pressure. This system undergoes a process where it is heated until all the liquid vaporizes. Determine the amount of heat required (kJ) and the mass left (kg). You can admit that there is no pressure drop at the outlet line