A1 Write the dimensions of the following properties in terms of the basic dimensions mass [M],...
7. Steam leaves an industrial boiler at 827.4kPa and 171.6°C (hf = 727.25 kJ/kg, hfg = 2043.2 kJ/kg ). A portion of the steam is passed through a throttling calorimeter and is exhausted to the atmosphere when the calorimeter pressure is 101.4 kPa and a temperature of 115.6°C (h= 2707.6 kJ/kg ). How much moisture does the steam leaving the boiler contain ? 8. During the polytropic process of an ideal gas, the state changes from 138 kPa and 5°C...
Question 6 a) Differentiate between a pump-head capacity curve and system-head capacity curve. [2 Marks] b) A pump has the characteristics listed in the Table Q6 (b) when operated at 1170 rpm. i. Develop head-capacity curves for a pump operated at 870 and 705 rpm. [4 Marks] Hence or otherwise, determine the head at 870 rpm corresponding to Q = 0.44 m3/s. [2 marks] Table Q6 (b) Capacity(m/s) Efficiency (%) 0.0 0.1 0.2 0.3 0.4 Head(m) 40.0 39.0 36.6 34.4...
(1) Q.5 (a) A power station using a Superheated Rankine cycle operates with a boiler pressure of 160 bar and a condenser pressure of 0.045 bar. The turbine has an inlet steam temperature of 575°C, and has an isentropic efficiency of 90.5%. The pump has an isentropic efficiency of 88%. Hence, determine Show the cycle on a T-s diagram in relation to the saturation curves and clearly label all the principal points starting from the exit of the condenser. Sketch...
Water is the working fluid in a modified Rankine cycle with superheat and reheat. Water as superheated vapor enters the high-pressure stage turbine at 60 bar and 440 C and leaves at 5 bar as liquid-vapor mixture with a quality of xa-0.98. It is then reheated to 400 °C at the same pressure of 5 bar before entering the second stage turbine where it expands to a pressure of 0.1 bar and a mixture quality of x0.96. The condenser pressure...
Calculate the mass of a solid gold rectangular bar that has dimensions of 4.00 cm x 10.5 cm x 27.5 cm. (Assume the density of gold is 1.93 x 104 kg/m3.) 18. 3x Your response differs from the correct answer by more than 10%. Double check your calculations. kg Need Help? Read It Master It Talk to a Tutor Submit Answer Practice Another Version 3.34/5 points Previous Answers SerPSE8 14.P.003.WI. B My Notes A 54.0-kg woman wearing high-heeled shoes is...
Please help me to solve these two questions. Thank you. 2. Water flow is measured by a 4 ft wide rectangular weir. The weir crest is 2.5 ft above the channel basement. The minimum and maximum water depths in the weir are measured as 0.4 ft and 2 ft, respectively. Calculate the minimum and maximum flowrates for a contracted rectangular weir with the length of 2 ft. (Note: Consider the relation between h and b/3, and choose appropriate equation to...
Question 3 (40 marks) (a) Air enters a horizontal nozzle with a velocity of 1 m/s, a pressure of 2 bar and a temperature of 350 K. At exit from nozzle, the air temperature is 450 K. The combined rate of specific heat transfers, and specific work transfers, w to the air as it passes through the nozzle is 150 kJ/kg. Assume that the air flow is steady and air can be treated as perfect gas with = 1005 J/(kg.K)....
A mixture containing 42% benzene and 58% toluene by mass is fed to a distillation column. A second mixture is also fed to the distillation column and has a composition of 65% toluene and 35% acetone by mass. The flowrates of the mixtures are 2500 kg h1 and 1500 kg h1 respectively. An overhead distillate exit stream of 800 kg h-1 containing 23% acetone and a bottom exit stream of 25% benzene are produced. Determine the bottom exit flowrate and...
3. (40 pts) A steam power plant based on the Rankine cycle, shown in the below, operates to develop net cycle power. Saturated vapor at 8 bar enters the turbine where it expands to the condenser pressure of 1 bar. Water liquid exits the condenser 30 °C and 1 bar and it is pumped to the boiler pressure of 8 bar. Isentropic efficiencies of the turbine and pump are 80% and 60%. Assume kinetic and potential energies are negligible at...
1. 1. The primary energy savings in tep (1 MWh -0.086 tep) and diesel, which involves the direct use of heat from a geothermal resource to cover a heat demand of 100 kW for 3,500 h / year, assuming that this demand will be covered with diesel boiler of average yield 0.8 (for diesel 1.12 tep/ton gas oil), they are: a) 30.1 tep/year, 26.9 ton/year b) 37.6 tep/year, 33.6 ton/year c)41.2 tep/year, 36.8 ton /year 1. 2. A hydraulic pump...