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4.1 Saturated steam at 300°C is used to heat a counter currently flowing stream of methanol vapour from 65°C to 260°C in an adiabatic heat exchanger. The flow rate of the methanol is 5500 standard litres per minute, and the steam condenses and leaves the heat exchanger as liquid water at 90°C.4.1.1 Calculate the required flow rate of the entering steam in m3 /min. (10)4.1.2 Calculate the rate of heat transfer from the water to the methanol (kW). (5)
Write down the differential equation the solution of which is close to the number of occurrences in the reversible Lotka-Volterra reaction.
A steam turbine operates adiabatically at a power level of 3500 kW. Steam enters the turbine at 2400 kPa and 773.15 K (500°C) and exhausts from the turbine as saturated vapor at 20 kPa. What is the steam rate through the turbine, and what is the t..
Explain the action of a pn-junction with bias. Consider both the forward bias and the reverse bias, and use sketches wherever possible.
A strap, instrumented to measure stretch, is worn around the chest to detect respiration whilst a subject is at-rest. The resulting signal is contaminated by electrical noise from the mains at 50 Hz with a similar amplitude to the respiration sign..
What does this experiment reveal regarding the biocompatibility of this device, specifically regarding the inflammation response?
Use the total energy of charge distribution to calculate the total electrostatic energy of a uranium 235 nucleus. It has 92 protons and a radius of about 7.0 femtometers?
The steam in the previous example is cooled using water at 1 bar, 25 °C. The cooling water emerges at 40 °C at the exit of the heat exchanger. Determine the heat load and the entropy generation. Compare the result with the previous example.
Calculate the ratio of the network over the amount of heat absorbed at the high temperature of the cycle. How does this value compare to the theoretical efficiency of the Carnot cycle that is calculated based on the two operating temperatures?
The total length of the pipeline from the rail tanker outlet to the pump inlet is 50 m. The vertical distance from the tank outlet to the pump inlet is 10 m. Commercial steel piping, 50 mm internal diameter, is used.
Define what is meant by the numerical aperture and explain why the lens is oil filled. Using the Rayleigh Criteria, define the smallest resolvable features when light of wavelength 633 nm is used to illuminate the substrate and the oil filled obje..
Calculate the excess enthalpy of mixing for a solution that contains 60% by mol hydrazine at 20 °C.
At steady state with a feed concentration of 4 gmol/lit., and mean residence time of 65 sec in the second reactor, the concentration of feed to second from the first is found to be 2 gmol/lit., while that of the stream leaving the second is 1 gmol..
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