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1. Reconsider the cycle of Problem 8.46, but include in the analysis that each turbine stage and the pump has an isentropic efficiency of 85%.
2. For the cycle of Problem 8.47, investigate the effects on cycle performance as the feedwater heater pressure takes on other values. Construct suitable plots and discuss.
3. Water is the working fluid in an ideal regenerative Rankine cycle with one closed feedwater heater. Superheated vapor enters the turbine at 10 MPa, 4808C, and the condenser pressure is 6 kPa. Steam expands through the first-stage turbine where some is extracted and diverted to a closed feedwater heater at 0.7 MPa. Condensate drains from the feedwater heater as saturated liquid at 0.7 MPa and is trapped into the condenser. The feedwater leaves the heater at 10 MPa and a temperature equal to the saturation temperature at 0.7 MPa. Determine for the cycle
(a) the rate of heat transfer to the working fluid passing through the steam generator, in kJ per kg of steam entering the first-stage turbine.
(b) the thermal efficiency.
(c) the rate of heat transfer from the working fluid passing through the condenser to the cooling water, in kJ per kg of steam entering the first-stage turbine.
water from a reservoir maintained at 20 deg c is pumped steadily along a horizontal pipe from which it is discharged
before being injected into a furnace pulverized coal is preheated by passing it through a cylindrical tube whose
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040 kg automobile is accelerated from 5 kmph to 70 kmph. What is the average power (in hp) required if this is done in 7 s?
The number of additional tourists projected to be served by the company is 8000. If the company plans to invest $250000, determine the additional number of boats of each type for maximum profit.
Write a report on "Design & Analysis of Air Conditioning System for heavy vehicles using their exhaust heat"1 : Why is mileage an issue for trucks?2 How can use the waste heat (hot gases coming out of exhaust manifold) of engine for air conditioning?
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Subject a piece of steel to a case hardening process in which carbon is forced by diffusion through a layer on the surface of the piece. For this purpose, the piece of steel will be placed in a carbon-rich atmosphere in a special furnace.
A piston-cylinder device initially contains 0.007m^3 of nitrogen gas at 130kPa and 120C. The nitrogen gas is now expanded polytropically to a state of 100 kPa and 100C. Determine the boundary work done during this process. I know I need to use the fo..
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