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1. A shell-and-tube exchanger is to be used to cool hot oil from 90°C to 40°C using untreated cooling water entering at 18°C. the mass flow rates of the oil and water are 30 kg/s and 60 kg/s respectively. The exchanger is to be constructed from thin-walled copper tubes 2.5 cm in outside diameter. The oil acts as the shell-side fluid and the heat transfer coefficient associated with this flow is 600 Wm-2K-1. The thermal properties of the oil and water and the fouling factors are as in Q1. Determine the tube-length that would be required if:-
(a) 500 tubes used in a single tube pass
(b) 250 tubes are employed in an U-tube arrangement
A single shell pass is used in both cases.
Estimate the yielding stress of your blutack using a circular cross-section sample and weights/scales. Report three measurements.
in a cogeneration scheme a diesel engine-generator is used. the diesel engine-generator is rated at 2000 kwe. the
a cable is made of two strands of different materials a and b and cross sections as follows for material a k60000 psi
a hot water stream at 80 c enters a mixing chamber with a mass flow rate of 0.5 kgs where it is mixed with a stream of
A 200 kg crate is to be supported by the rope and pulley arrangement shown. Determine the magnitude and direction fo the force P that must be exerted on the freee end of the rope to maintain equillibrium.
helium has the lowest normal boiling point of any of the elements at 4.2 k. at this temperature the enthalpy of
an ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at
an 18-m long steel wire of 5mm diameter is to be used in the manufacture of a presstressed concrete beam.it is observed
Estimate the heat of vaporization of ethyl benzene at its normal boiling point using Trouton's rule and Chen's rule and compare the results with a tabulated value of this quantity. Then estimate ΔHv at 100°C using Watson's correlation.
An ideal/calorically perfect gas enters a constant-area heater at a Mach number of 0.20, a total pressure of 700 kPa, and a total temp of 500K. A heat interaction of 1030 kJ/kg into the gas occurs. Determine the Mach number, total pressure (kPa), sta..
A MASS of gas at an inital pressure of 28 bar and with internal energy of 1500kj,is
consider a cylindrical specimen of some hypothetical metal alloy that has a diameter of 8.0 mm 0.31 in.. a tensile
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