Thermal Power Engineering Answers

A shell-and-tube process heater is to be selected to heat water (cp = 4190 J/kg · °C) from 20°C to 90°C by steam flowing on the shell side. The heat transfer load of the heater is 600 kW. If the inner diameter of the tubes is 1 cm and the velocity of water is not to exceed 3 m/s, determine how many tubes need to be used in the heat exchanger.

Due to the remoteness and dispersed population of small islands, standalone PV
systems can play a significant role in providing energy access. Consider a typical
island in your country and size a PV system that can provide sufficient electricity to
a small school there. Start with a list of typical appliances and their duty cycles,
solar resource and meteorological conditions at the location and choose suitable
system components. Also carry out a simple cost- benefit analysis in comparison to
a diesel generator based system.

calculate the total upward force on a valve disc 2.5 inch in diameter if safety valve neck diameter is 3 inch and valve outlet diameter is 4 inch when the boiler steam pressure is 160 bar

Air initially at 3000 0F and 600 psia expands isentropically under non-flow condiions. The final volume is six times the initial volume. Show the process on the p-V and T-s coordinates and find a.) the final pressure, psia; b.) the final temperature, 0F; c.) the heat transferred, BTU/lbm; d.) the work done, BTU/lbm; e.) the change of entropy, BTU/lbm.0R.

Air initially at 400K expands in a constant pressure non-flow process until he initial volume is doubled. Find, a.) the heat transfer, kJ/kg; b.) the work, kJ/kg; and c.) the change in entropy, kJ/kg-K, for the process.

Air initially at 25 0C and 150 kPa is heated in a constant volume non-flow process until the pressure reaches 750 kPa. Find the required heat transfer, kJ/kg.

calculate the total upward force on a valve disc 2.5 inch in diameter if safety valve neck diameter is 3 inch and valve outlet diameter is 4 inch when the boiler steam pressure is 160 bar

Efficiency of a 300TPH, 100 kg/cm2, 520 degree C coal fired boiler is 84%.Calculate increase in fuel cost per month if rate of coal increases from rupees 2500 per ton to rupees 2550 per ton.The boiler runs in full load.Consider feed water temperature 140 degree C and GCV of coal 3600 Kcal/kg.

Dead weight Safety valve installed in Boiler having following data.
Working pressure of boiler-7kg/cm2, Barometer reading-1.03kg/cm2, valve size-75mm, Dead weight mounted on weight carrier-290kg. Calculate the equivalent weight of the valve, weight carrier and the cover of a dead weight Safety valve.