In a piston-cylinder assembly, there is initially a pressure of 300 kPa, a temperature of 150oC and a volume of 0.5 m3 of air. Until air doubles in volume with PVn=constant polytropic process expands as much. For n =1, n = k and n = 1.6

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

Chapter2: Matter And Energy

Section: Chapter Questions

Problem 30RQ: A gas is compressed inside a compressor's cylinder. When the piston is at its bottom dead center,...

See similar textbooks

Similar questions

In what four states does matter exist? Cite examples of each.
A gas cylinder with interior volume 11.6 L holds compressed air at 17.4 MPa. The cylinder is joined by a hose of negligible volume to a second cylinder that’s been pumped down to vacuum. When the valve on the full cylinder is opened, the air expands to fill the entire system, all the while maintaining a constant temperature. If the energy that becomes unavailable to do work is 171.8 kJ, what’s the volume of the second cylinder (L)?
Between 1-2: Isothermal compression (1st process)Between 2-3: Isometric compression (2nd process)Between 3-1: Adiabatic expansion (3rd process) A cyclic process through which N2 gas, which is considered to be the ideal behaving, is treated, has been described above. In case 1, the volume of gas is 9.6 m3, pressure 200 kPa. Since the pressure in state 3 is 750 kPa, find the work done in the whole process in kJ. Draw the P-V diagram for the cycle.
A piston-cylinder device contains 2 kg of water which is initially a saturated liquid at 300 ∘ C. It undergoes three processes to form a cycle. The first process is constant volume, the second is constant pressure at 2 bar and the third is a polytropic process where Pv 1.1 = constant. If you can calculate the heat transfer and work (both in kJ ) for each process. Is the device a heat engine or a refrigerator? Answer Table Description Work transfer for first process (kJ) Heat transfer for first process (kJ) Work transfer for second process (kJ) Heat transfer for second process (kJ) Work transfer for third process (kJ) Heat transfer for third process (kJ) Heat engine (1) or refrigerator (2) Value Value Thank you
The figure below shows a turbine-driven pump that provides water to a mixing chamber located dz⁢= 5 m higher than the pump, where m˙=50 kg/s. Steady-state operating data for the turbine and pump are labeled on the figure. Heat transfer from the water to its surroundings occurs at a rate of 2 kW. For the turbine, heat transfer with the surroundings and potential energy effects are negligible. Kinetic energy effects at all numbered states can be ignored. Determine:(a) the magnitude of the pump power, in kW.(b) the mass flow rate of steam, in kg/s, that flows through the turbine.
Construct a mass and energy flow diagram illustrating the following scenarios: a. When you breathe during winter, a fog is formed as you release hot air from your mouth. b. A cube is sliding on a rough surface. c. In a steam turbine, the input is high pressure steam and the output is condensate. d. A man jogging burns his Einternal that is stored as fat content.
1.1 Determine the electrical power supplied to a boiler when the temperature of the enteringwater is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is anegligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specificheat is c = 4,370 J/(Kg K). There is a 1.5(105) W rate of heat loss from the boiler during this process to asurrounding at 293.2 k. Consider steady state conditions.1.2 Calculate the total rate of entropy production in Problem 1.1.1.3 Calculate the total rate of exergy destruction (W) in Problem 1.1. The dead statetemperature is 293.2 K and pressure is 1 bar.1.4 Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to theconditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The highheating value (HHV) of the fuel is 50.02 MJ/kg.1.5 Calculate the exergy destroyed in the process described by problem 1.4. The exergy…
1.1 Determine the electrical power supplied to a boiler when the temperature of the enteringwater is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is anegligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specificheat is c = 4,370 J/(Kg K). There is a 1.5(105) W rate of heat loss from the boiler during this process to asurrounding at 293.2 k. Consider steady state conditions.1.2 Calculate the total rate of entropy production in Problem 1.1.1.3 Calculate the total rate of exergy destruction (W) in Problem 1.1. The dead statetemperature is 293.2 K and pressure is 1 bar.1.4 Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to theconditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The highheating value (HHV) of the fuel is 50.02 MJ/kg.1.5 Calculate the exergy destroyed in the process described by problem 1.4. The exergy…
In the following question you may ignore changes in elevation and velocity of the fluid. (a) In a steam power plant liquid water enters the boiler at a temperature of 40°C and exits as wet steam at a pressure of 15 bar with a dryness fraction of 0·95. Find the heat transfer per kg to the steam. (b) The wet steam passes through a superheater and emerges at a pressure of 15 bar and temperature of 300 °C. It then passes through a turbine, generating 400 kW of power as it does so, and comes out as wet steam at a pressure of 1 bar. The mass flow rate is 0·57 kg/s. There is no heat loss from the turbine. (i) Show that the exit specific enthalpy is about 2337 kJ/kg. (ii) Find the dryness fraction of the steam at the turbine exit. (c) Sketch the T-S diagram for the Rankine (steam plant) cycle and describe the processes. Also indicate on the diagram the points corresponding to the inlet and outlet of the boiler, superheater and turbine.
Liquid octane enters an internal combustion engine operating at steady state with a mass flow rate of 0.004 lb/sand is mixed with the theoretical amount of air. The rate of heat transfer is 22.22 BTU/s. If the density of octane is 5.88 lb/gal, how many gallons of fuel would be used in 2 h of continuous operation of the engine?
Determine work from state 1 to state 2.
1, A small ball, mass = 0.60 kg, at the end of a string is whirled in a vertical circle of radius = 60 cm with a tangential velocity of 8.0 m/s. (a) What is the tension in the string when it is at the bottom of the circle? (b) What is the tension in the string when it is at the top of the circle? (c) What is the critical velocity? 2, A cement truck, mass = 2000 kg, has an engine which produces 4000 N. The truck develops a leak and loses cement at a rate of 10 kg/sec, (a) The truck starts from rest and accelerates when the light turns green. What is its initial acceleration? (b) What is the equation for the acceleration as a function of time? (c) What is the equation for the velocity as a function of time? (d) How long will it take the cement truck to get up to a velocity of 15 m/s?