Consider a conventional piston-cylinder system. Compute the work required to compress air to 0.2 m3 initially contained under atmospheric pressure and in a volume of 0.5 m3. Consider three cases:  a) the processes is isobaric:  b) the process is adiabatic:     c) the process is isothermal:

1

Steam generators are a type of heat exchanges that are used in power plants to generate steam at desired pressure and temperature (Fig. Q1.b). In a steam generator, saturated liquid water at 30°C enters a 60-mm diameter tube at the volume flow rate of 12 L/s. After exchanging heat with hot gas, the water changes to steam and leaves the generator at a pressure of 9 MPa and a temperature of 400°C. During this process, the diameter of the water/steam tube does not change.(iii) What is the exit velocity of the steam?

In a quasi-static isobaric expansion, 540 J of work are done by the gas. The gas pressure is 0.90 atm and it was originally at 15.0 L. If the internal energy of the gas increased by 70 J in the expansion, how much heat (in J) does the gas absorb?

Given : STEADY STATE COMPRESSOR INLET PRESSURE: IN LET VOLUMETRIC AIR Ask: is elbf/in² FLOW RATE 5 ft³/s POLY TROPIC GOES THROUGH DIAMETER (INCHES) OF FOR EXIT PRESSURE AND EXIT VELOCITY OF PROCESS Pv¹.5 = constant EXIT PIPE 160 lbf / in 2 145ft/s.

This question deals with a cylinder, which is upright. Here are the facts for the problem. Can you please help me with a clear diagram and then the right equations for net work and heat? There is a massless and frictionless piston inside the cylinder with two stops which prevent movement down the cylinder. But, the cylinder can still move upward. Under the Below the piston is 5 kg of water, 50% of which (by mass) is initially vapor at 120°C. Heat is gradually added to the water until the water reaches a final state of 400°C. The atmospheric pressure is 500 kPa. The stops don't affect the area.  (1) Draw a P-V diagram for the process, which includes the isotherms at states 1 and 2.  (2) A what temperature does the piston first lift off? At what temperature has the liquid turned to vapor? (3) What is the net work and heat transfer between the system and the surrondings between states 1 and 2. Are these transfers going into or out of the system?

1 - Consider 2 kg of water in a cylinder blocked by a piston at 20 C, 200 kPa. Water is heated and piston starts to rise. When the piston reaches the blocks, the volume of water has doubled. Heating continues until the pressure also doubles. Calculate the work done by water and the amount of heattransfer. Consider the case that the piston is restricted by the linear spring. Initially the spring is at rest. Water is heated until the piston reaches the blocks. Just before it hits the blocks the pressure is twice the initial pressure. Calculate the work done by water and the amount of heat transfer by the time the piston reaches the blocks. 7 D H₂0

Problem 5. A 1000 cubic foot room is initially at standard temperature and pressure. A resistance heater in the room is consuming 1500W of electricity. What is the air temperature of the room after 3 hours? Assume the room acts as an isolated system. Hint: The specific heat of a substance is the amount of heat it takes to warm one unit mass of material by one degree. The specific heat of air (assuming constant volume) can be taken as C₂ = 700J/kg°C. This relates the total heat added to the system to its temperature rise.

Consider a sealed, rigid container of 10 kg of water vapor at 25°C and 80 kpa. A paddle wheelwith a power rating of 1 kW is operated within the tank for 30 minutes. During that time 7 kJ ofheat are lost to the surroundings.  a.) Define the system. b.) What types of energy transfer occur? c.) What is the net energy change of the system?