The working gas of a thermodynamic cycle is a diatomic gas (assume constant specific heats.) The gas originally starts at 100kPa, 4m ³ and 27° C. It undergoes a four-step process --- • Process A-B: The gas is compressed at constant temperature to one-quarter of its original volume. • Process B-C: The volume of the gas is then doubled at constant pressure. • Process C-D: The gas then undergoes an adiabatic expansion. • Process D-A: The gas then undergoes a constant volume process back to its original state a) Make a table of the temperature, pressure, volume, internal energy, enthalpy, entropy and quality factor (T, P, V, U, H & S) at the start of each process. b) Make a table of the change in internal energy, heat flow, work done, change in enthalpy, and change in entropy (AU, Q, W, AH & AS) during each leg of the cycle. c) Draw well-labelled P-V & T-S diagrams (indicating lines of constant temperature, heat flow, work, etc.) d) Calculate the thermal efficiency of the cycle.

(2) Describe briefly why the following statements are wrong. (a) "Hot cup of coffee becoming cold spontaneously is an entropy-decreasing process. So the law of entropy increase can be violated." (b) “Air conditioners require bulky external unit, exhausting heat to outside. With the technology constantly advancing, external unit will be eliminated in the future."

A water pump is to be purchased for a mechanical boiler system. The cost is 20,000 TL with a depreciation rate of 10% for a service life of 10 years. Determine the depreciation of the compressor for the second year using the declining-balance depreciation method and find the correct answer stated below.

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Steam is bled from a turbine to supply 2 MW of process heat in a chemical plant at 200 °C, as shown in the schematic, so that state 4 is saturated Part A liquid water at 200 °C. At the turbine inlet, (state- 1) steam is at 5 MPa , 500 °C and at the turbine exit the pressure is 10 kPa. (Figure 1) Determine the quality of steam at the turbine exit. Express your answer to two significant figures. Πν ΑΣ φ vec Submit Request Answer Part B Determine the bleed pressure (assume no frictional losses). Express your answer to three significant figures. Πν ΑΣ φ vec ? MPа Submit Request Answer Part C Determine the bleed rate. Express your answer to three significant figures. ΑΣφ vec ? kg/s Submit Request Answer Figure 1 of 1 Turbine Part D output Determine the mass flow rate (m) at the turbine inlet if the power output is 2 MW Express your answer to three significant figures. Process heat ΑΣΦ vec ? kg/s

Required information Problem 07.021 - DEPENDENT MULTI-PART PROBLEM - ASSIGN ALL PARTS NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. During the isothermal heat addition process of a Carnot cycle, 700 kJ of heat is added to the working fluid from a source at 400°C. Problem 07.021.c - Total entropy change for the process Determine the total entropy change for the process. The total entropy change for the process is KJ/K.

Select the correct expressions of the entropy change for the ideal gases with constant specific heats for arbitrary processes ___________   A.     B.     C.     D.

The figure shows a reversible cycle through which 1.00 mole of a monatomic ideal gas is taken. Process bc is an adiabatic expansion, with pb = 5.80 atm and Vb = 1.00 x 10-3 m3. For the cycle, find (a) the energy added to the gas as heat, (b) the energy leaving the gas as heat, (c) the net work done by the gas, and (d) the efficiency of the cycle.

Full solution using thermodynamics equation "A 700 kg piston is initially held in place by a removable latch above a vertical cylinder. The cylinder has an area of 0.1 m^2; the volume of the gas within the cylinder initially is 0.1 m^3 at a pressure of 10 bar. The working fluid may be assumed to obey the ideal gas equation of state. The cylinder has a total volume of 0.25 m^3, and the top end is open to the surrounding atmosphere at 1 bar." (a) Assume that the frictionless piston rises in the cylinder when the latches are removed and the gas within the cylinder is always kept at the same temperature. What will be the velocity of the piston as it leaves the cylinder. (b) What will be the maximum height to which the piston will rise? (c) What is the pressure behind the piston just before it leaves the cylinder? (d) Now suppose the cylinder was increased in length such that its new total volume is 0.588 m3. What is the new height reached by the piston?