Chapter 6, Problem 6.129EP

QUICKLY AND CORRECTLY PLEASE Two vessels A and B of different sizes are connected by a pipe with a valve. Vessel A contains 140 L of air at 3000 kPa, 90oC. Vessel B, of unknown volume, contains air at 70 kPa, 5oC. The valve is opened and, when the properties have been determined, it is found that pm = 1400 kPa, tm = 45oC. (a) What is the mass in kg of air initially inside vessel A (b) What is the volume of vessel B in liters?

A piston cylinder device contains an ideal gas changed with an initial condition of 120 kPa and a volume of 11.5 m. Final conditions for the gas should be 1320 kPa and 0.85 m2. This can be done by performing any of the following processes, a. Isothermal compression b. Adiabatic compression then isobaric cooling c. Adiabatic compression then isochoric cooling For each of the reversible processes, calculate Q, W. AU and AH.

Q1: 100 m² of air per minute at 30 C° DBT and 60% RH is cooled to 20 CDBT by passing through a cooling coil at a pressure of 1 bar. Find: 1- Capacity of cooling coil in tons of refrigeration. 2- RH and WBT of air after cooling

Two vessels A and B of different sizes are connected by a pipe with a valve. Vessel A contains 134L of air at 2,639.66 kPa, 87.38°C. Vessel B, of unknown volume, contains air at 69.36 kPa, 6.33°C. The valve is opened and, when the properties have been determined, it is found that Pm = 1,041.50 kPa, tm = 46.30°C. What is the volume of vessel B?

In the boiler of a steam engine the superheated steam is at 500 degrees Celsius and 20 mPa is created by adding an amount of heat to the pressured water. Erros up to 10% have come up. Find the ideal gas law. Could the error seen in testing be due to the ideal gas law assumption? - value from the ideal gas law - value from tables - %Error Which of the above values is the most accurate? Could the error seen in testing be due to the ideal gas law assumption?

Sensible heat of 496 kW is required to be added to the saturated air at 2 °C dry-bulb temperature passes through a heating coil at 12 m³/s.   1- Find the enthalpy h₂ and dry-bulb temperature T₂ for the air at the final state. 2- Draw the process on the psychometric chart.

Water is heated in a closed container with rigid walls that is a perfect cube (1 m x 1 m x 1 m). The initial volume of the water (liquid + vapor) is 1 m'. The initial temperature of the water is 100 °C and it has a quality of 0.3. It is heated until it reaches a final pressure of 700 kPa. a. Sketch the process on the P V diagram. b. What is the work done by the water during this heating process in kJ? c. What is the final temperature of the water? d. What is the heat required in order for this process to occur in kJ? P V

find the changes in h  as appropriate. The initial state pressure is p1 = 0.5 MPa. the final state is 2.   a.  constant volume :                   v1 = 0.3 m3/kg,            p2 = 0.3 MPa; b. constant entropy :                    s1 = 6.3 kJ/kg K,        p2 = 0.15 MPa; c. constant volume :                    h1 = 2500 kJ/kg,          p2 = 0.2 MPa; d. constant enthalpy :                 s1 = 6.4 kJ/kg K,        p2 = 0.2 MPa;

A spring-loaded piston-cylinder device contains of m=1kg carbon dioxide. Initially, the spring has no force on the piston and P₁ = 500kPa, T₁ = 150K, V₁ = 0.1m³. Heat is transferred to the gas, causing the piston to rise and to compress the spring. At the state 2, T₁₂=900K, V₂=0.3m³. The gas is an ideal gas. (11) Calculate the heat transferred into the system in P1, V1, T1 P2, V2, T2 in kJ?