A cylinder with a movable piston contains 4.0 liters of gas at 30 degrees Celsius 4 bar. The piston is slowly moved to compress the gas to 8.0 bar. a) considering the system to be the gas in the cylinder and neglecting Ep, write and simplify the close system energy balance. Do not assume that the process is isotherm in this part.  b) Will the temperature increase, decrease or remain the same? Explain

Just c. please

Just B. please

This problem is (6.21) from a book  "Thermodynamics and Statistical Mechanics An Integrated Approach by M. Scott Shell"

An insulated, vertical piston–cylinder device initially contains 15 kg of water, 10 kg of which is in the vapor phase. Initially the pressure is 200 kPa inside the cylinder. A linear spring is connected to the piston therefore the pressure changes linearly with volume (P = m*v+b). Super heated steam at 0.5 MPa and constant temperature is allowed to enter the cylinder from a supply line until all the liquid in the cylinder has just vaporized and the pressure and volume in the cylinder have both doubled.   Determine the final temperature (in ºC) in the cylinder.  Determine the mass of the steam that has entered during this process. Determine the boundary work (in kJ) associated with the system during this process Determine the specific enthalpy (in kJ/kg) of the steam entering the cylinder.

Final answer in two decimals. Show the solution.

Steam -Valve Control volume boundary kJ Turbine Initially evacuated tank In case of emergencies, a turbine is connected to an active steam pipe line using a valve. When the valve is opened, steam from the pipe line, which is initially at 400° C and 7 MPa, flows through the turbine into a 0.69 m³ tank, which is initially evacuated. The valve is closed when the pressure inside the tank is 1.8 MPa and the temperature in the tank is 350° C. If the entire process is completed adiabatically, what is the amount of work generated from the turbine?

Examples for state functions are O a. Change in internal energy O b. Enthalpy O c. Work O d. Internal energy Clear my choice

A closed cycle is executed with helium as the working fluid. The flow rate through the device is m in = 1 kg/s.The cycle consists of four processes:1→2: Reversible, adiabatic expansion 2→3: Reversible, isobaric heat transfer to double the specific volume (i.e., v3/v2 = 2)3→4: Reversible, adiabatic compression back to the original pressure4→1: Reversible, isobaric heat transfer back to the original state a) Complete the following table and mention what the physical state of helium is in each step. Assume R= 2.077 for helium and k= cp/cv= = 5.1926/3.1156 = 1.6667. Detail the assumptions for each formula we are using for each box we fill.  b) show the states and process path on a P-v and T-s diagram.

3) A rigid tank (stationary) contains a hot fluid that is cooled while being stirred by a paddle wheel. Initially, the internal energy of the fluid is 800 kJ. During the cooling process, the fluid loses 500 kJ of heat, and the paddle wheel does 100 kJ of work on the fluid. Determine the final internal energy of the fluid. Neglect the energy stored in the paddle wheel.