Chapter 5, Problem 5.62P

= 1bar, v1= 10m³ to p2 =10 bar , v2 = 1m³, calculate Q3/ An ideal gas is changed from pl Q & W for the follwing process: a- Isothermal process. b- adiabatic compression followed by cooling process at constant pressure. c- Heating at constant volume followed by cooling at constant pressure? Take Cp= (5/2)R & Cv=(3/2) R

PROCESSES OF PURE SUBSTANCE: There are 3 kg/min of steam undergoing an isothermal process from 30 bar and 350 oC to 7 bar. (note 1 bar = 100 kPaa). Find: a) ΔS (kJ/k), b) Heat transferred (kJ), c) ΔH (kJ), d) ΔU (kJ) (SHOW COMPLETE SOLUTION) (IMPORTANT! SHOW THE P-V AND T-S DIAGRAM PLEASE)

1bar, v1= 10m³ to p2 =10 bar , v2 = 1m³, calculate Q3/ An ideal gas is changed from p1 Q & W for the follwing process: a- Isothermal process. b- adiabatic compression followed by cooling process at constant pressure. c- Heating at constant volume followed by cooling at constant pressure? Take Cp= (5/2)R & Cv=(3/2) R

Two kilograms of gas with R = 0.218 kJ/(kg-K) undergoes a process and results to the following changes: ΔH = 3150 kJ, ΔU = 2450 kJ. Find the specific heat ratio, k.

2-[30P] A well-insulated tank contains air at 110 kPa and 40 °C with the isolation valve closed. We now open the valve and let pressurized air enter the tank. We close the valve in 6 seconds when pressure in the tank reaches 130 kPa. Find the amount of air that has entered the tank and the last temperature inside the tank. Mar = 28.97 kg/kmol. P = 140 kPa,T= 200 C P = 140 kPa, T = 200 C P= 140 kPa, T = 200 C P,= 110 kPa T = 40 C V = 1 m? 130 kPa time time T=f() V =1m V = Im

2.4 An initially déflated and flat balloon is connected by a valve to a storage tank containing helium gas at 1 MPa at ambient temperature of 20°C. The valve is opened and the balloon. is inflated at constant pressure of 100 kPa (atmospheric pressure) until it becomes spherical at D, = 1 m. If the balloon is larger thàn this, the balloon material is stretched giving a pressure inside as: D P = P, + C ( - P1) P. D D Chapter Two | 79 The balloon is slowly inflated to a final diameter of 4 m, at which point the pressure inside is 400 kPa. The temperatuře remains constant at 20°C. Determine the work done during the overall process.

SOLVE STEP BY STEP IN DIGITAL FORMAT   4. Consider saturated water in a fixed thermodynamic state with a pressure of 0.15MPa and a temperature of 384.5 K. Find the value of the enthalpy in that state.

E3.1. You must use the property data from the tables in the Appendix of your text to do this problem. The figure below illustrates a pressure cooker with the pressure relief valve removed. atm- 100 kPa V= 2 liter bottom 5% is filled with liquid water . The pressure cooker has an internal volume of V = 2 liters. Because the relief valve is removed, the contents are initially at atmospheric pressure, Patm = 100 kPa. The pressure cooker contains water in a two-phase state. The bottom 5% of the volume of the vessel is filled with liquid water while the remainder of the vessel contains water vapor. a) Determine the initial temperature of the water in the cooker. b) Determine the quality and specific volume of the water initially in the cooker. c) Sketch by hand a T-v diagram and label the initial state of the water (state 1).

5. At temperature t= 15°C and pressure 0.98 bar, the specific volume of 0.45 m/kg. Subsequently pressure drops to P2 =0.6 bar while the temperature remains constant. Make calculation for the density of gas under the change gas %3D condition.