the following data are for steam power plant: Pressure and temperature of steam at boiler exit and turbine inlet (state2)=30 bar and 300°C.  Pressure and quality of steam at turbine exit and condenser inlet (state 3) =20 kpa and 95%. Pressure of saturated water at condenser exit and pump inlet (state 4)=20 kpa. Pressure and temperature of water at pump exit and boiler inlet (state1)=30 bar and 100°C. Steam flow rate =15 kg/s. The heat losses from the body of the turbine =100 kW. Determine the thermal efficiency of the steam power plant

Separate streams of air and water flow through the compressor and heat exchanger arrangement shown below. Steady-state operating data is provided in the figure. Heat transfer with the environment can be neglected, as can all potential and kinetic energy effects. Air is modeled as an ideal gas. Determine: (a) the total power required by both compressors, in kW. (b) the mass flow rate of the water, in kg / s.

(5)An insulated piston-cylinder device contains 15 L of saturated liquid water at a constant pressure of 950 kPa. Water is stirred by a paddle wheel while a current of 15 A flows for 28 min through a resistor placed in the water. If 64% of the liquid is evaporated during this constant pressure process and the paddle-wheel work amounts to 600 kJ, determine the voltage of the source. Also, show the process on a P-v diagram with respect to saturation lines. H,0 P= constant W. W.

Question 1.2 A helical coil cooler is used to cool 0.5 kg.s¹ of hot oil from 100°C down to 40°C. Cooling water with an inlet temperature of 10°C flows inside the coiled tube. The specific heat of the oil is 2 kJ.kg¹.K¹, the specific heat of the water is 4.2 kJ.kg¹.K¹, and the density of water is 1000 kg.m. a) Determine the lowest possible cooling water flow rate. (0.48 kg.s¹) b) Determine the inside diameter of the tube if a cooling water flow of 1.5 times the minimum is used, and the recommended flow velocity is 1 m.s. Select an appropriate tube from the following standard sizes: Outside diameter (mm) Wall thickness (mm) 30 1.5 35 2.0 40 2.0 45 2.5 50 3.0 c) For a heat transfer coefficient of U = 800 W.m2.K, determine the heat transfer surface area and the tube length of the heat exchanger. The oil inside the tank is mixed by a stirrer and the oil temperature at any location in the tank can be assumed to be equal to the oil outlet temperature. (Area = 4.12 m², length = 39.7 m)

An insulated, vertical piston–cylinder device initially contains 15 kg of water, 10 kg of which is in the vapor phase. Initially the pressure is 200 kPa inside the cylinder. A linear spring is connected to the piston therefore the pressure changes linearly with volume (P = m*v+b). Super heated steam at 0.5 MPa and constant temperature is allowed to enter the cylinder from a supply line until all the liquid in the cylinder has just vaporized and the pressure and volume in the cylinder have both doubled.   Determine the final temperature (in ºC) in the cylinder.  Determine the mass of the steam that has entered during this process. Determine the boundary work (in kJ) associated with the system during this process Determine the specific enthalpy (in kJ/kg) of the steam entering the cylinder.

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A flow of 1950 kg water/h enters at 290 K for cooling and flow outside the tube. An oil which has a heat capacity is 2.30 kJ/(kg∙K) is being cooled in a heat exchanger from 372 K to 310 K and flows inside the tube at a rate of 2600 kg/h. Calculate the water outlet temperature and heat transfer area if the overall heat transfer coefficient is 340 W/(m2·K) and the streams are countercurrent.

Air at 150 kPa and 25°C is transported through a 2-inch Schedule 40 commercial steel pipe. Consider that the air behaves as an ideal gas, that the flow is adiabatic and that the Mach number under these conditions of pressure and temperature is 0.35. Calculate the length of the pipe when the air pressure and temperature decrease to 54.375 kPa and -10.6°C.