A gas undergoes a process in a piston-cylinder assembly during which the pressure-specific volume relation is pv¹.2 = constant. The mass of the gas is 0.4 lb and the following data are known: p₁=160 lbf/in.², V₁ = 1 ft³, and p2 = 300 lbf/in.² During the process, heat transfer from the gas is 2.1 Btu. Kinetic and potential energy effects are negligible. Determine the change in specific internal energy of the gas, in Btu/lb.

A gas undergoes a process in a piston-cylinder assembly during which the pressure-specific volume relation is pv¹.2 = constant. The mass of the gas is 0.4 lb and the following data are known: p₁=160 lbf/in.², V₁ = 1 ft³, and p2 = 300 lbf/in.² During the process, heat transfer from the gas is 2.1 Btu. Kinetic and potential energy effects are negligible. Determine the change in specific internal energy of the gas, in Btu/lb.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter31: Gas Heat

Section: Chapter Questions

Problem 5RQ: The specific gravity of natural gas is A. 0.08. B. 1.00. C. 0.42. D. 0.60.

See similar textbooks

Similar questions

1. Happens when an interaction of the thermometer and matter causes no further change in the system. a. thermal force b. thermal equilibrium c. thermal power d. thermal exchange 2. The triple point of water is a. 1000 Pa b. 1 atm c. 610 Pa d. 101, 325 Pa 3. This is defined when a system in a given initial stage goes through a number of different changes of a state or processes and finally returns to its initial state. a. adiabatic process b. thermodynamic cycle c. thermodynamic system d. Zeroth law of thermodynamics
Q5: First law of thermodynamics deals mainly with _______ a. Conservation of mass b. Conservation of momentum c. Conservation of energy d. Conservation of pressure
Question # 2 A gas of mass (4)kg undergoes a quasi-static expansion which follows a relationship p = a+bv, where ‘a’ and b are constants. The initial and final pressures are (1017) kpa and (217) kpa respectively and corresponding volumes are 0.2meter cubic and 1.2meter cubic. The specific internal energy of the gas is given by u=1.5 pv -85kJ/kg, where ‘p’is in kpa and ‘v’is in m3/kg. Describe the process involved in given system and calculate the net heat transfer and the maximum internal energy of the gas during expansion. (m3 means metercubic).
In a power plant operating with water and steam, the following measurements and observations were done at various stages along the system: the temperature is 130oC and the phase of the substance is compressed liquid. Based on this observation, identify the following values: pressure, P (in kPa) = _____ enthalphy, h (in kJ/kg) = _____ and the specific volume, v (in m3/kg) = _____
What are three forms of energy interactions though boundaries of a system? A. Internal energy B. Heat C. Work D. Mass flow
Measured data for pressure versus volume during the compresion of a refrigerant within the cylinder of refrigeration compressor are given in the table below. Using data from the table, complete the following: (a) Determine a value of n such that the data are fit by an equation of the form, p V^n=constant. (b) Evaluate analytically the work done on the refrigerant, in BTU using Eq. 2.17 along with the result of part (a) (c) Using graphical or numerical integration of the data, evaluate the work done on the refrigerant, in BTU (d) Compare the different methods for estimating the work used in parts (b) and (c). Why are they estimates?
Some unknown gas undergoes a polytropic process, pV^1.5 = constant, the initial pressure, p1, is 1 bar, and the initialvolume, V1, is 1 m3. We also know the final volume, V2, is 4 m3. Please determine 1) the final pressure of the gas, p2, inbar; and the total work done by the gas, W, in kJ; 2) judge the direction of energy flow for the work: into the system or outof the system.
As shown in the figure below, a gas contained in a vertical piston-cylinder assembly. A vertical shaft whose cross-sectional area is 0.8 cm2 is attached to the top of the piston. Determine the magnitude, F, of the force acting on the shaft, in N, required if the gas pressure is 3 Bar. The masses of the piston and attached shaft are 24.5 kg and 0.5 kg, respectively. The piston diameter is 10 cm. The local atmospheric pressure is 1 bar. The piston moves smoothly in the cylinder and g = 9.81 m/s2.
A gas enters the furnace with the following conditions: P, = 27 psia; V1 = 11.7 cu. feet per pound; U1= 102.6 Btu per pound; V, = 162 feet per second. The substance leaves the system with the following conditions: P2 = 34 psia; V2 = 10.3 cu. feet per pound; U2= 149.0 Btu per pound; V2 = 605 feet per second. Change in elevation are negligible and 10 Btu per pound heat is added to the fluid as it passes through the system. Calculate the work done on or done by the system.
Heat transfer is always from higher reservoir to a lower reservoir, and not the opposite, because: Higher energy means more capability to diffuse Higher energy means capability to be constant Higher energy means atoms and molecules are in ground state Lower energy means system is in equilibrium None of the above
Thermodynamics topic: Properties of pure substances
Thermodynamics Answer the following problem with complete solutions. Write legibly A gas goes through the following thermodynamic processes: A to B: constant-temperature compression; B to C: constant-volume cooling; C to A: constant-pressure expansion. The pressure and volume at state C are 1.4 bars and 0.028 m^3, respectively. The net work during the C-to-A process is 10.5 kJ. What net work is derived from one complete A-B-C cycle?