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1) When a thermocouple is moved from one medium to another medium at a different temperature, the thermocouple must be given sufficient time to come to thermal equilibrium with the new conditions before a reading is taken. Consider a 0.1 cm diameter copper thermocouple wire originally at 150 oC. Determine the temperature response (temperature variation with time) when this wire is suddenly immersed in a) water at 40 oC (h= 80 W/m2 K) and b) air at 40 oC (h=10 W/m2.K). Given that for copper k=391 W/m K, c=383 J/kg K and ??=8930 kg/m3. Please comment on the results.
2) A heating contractor must heat 0.2 kg/s of water from 15 oC to 35 oC using hot gases in cross flow over a thin walled tube.
Your assignment is to develop a series of design graphs that can be used to demonstrate acceptable combinations of tubes dimensions (D and L) and plot gas conditions (T∞ and V) that satisfy this requirement. In your analysis, consider the following parameter ranges: D= 20, 30, and 40 mm; L=3, 4. Or 6 m; T∞=250, 375, or 500 oC; and 20 <= V<= 40 m/s.
Use Laplace transformation to solve the initial value problem
The atmospheric pressure of 100k Pa acts on the other side of the piston. The gas is heated until the volume is doubled and the final pressure is 500 kPa. Calculate the work done by the gas.
Design a Heat Exchanger for the Following Duty: Reduced crude oil leaving a distillation unit with a flow rate of 3166.04 kL/d at 268 oC and is to be cooled to 243 oC by exchange with 62.8 kg/s pre-flashed crude oil coming from pre-flash unit at 206 ..
What is the required flow rate of cooling water to the exchanger between the wasteheat boiler and the absorber and how much heat must be removed by the two heat exchangers cooling the recycled absorber liquid? Why is there a need to remove this heat?
(a) Describe the provisions of Occupational Safety and Health Act 2005 with regard to ‘Substances hazardous to health' (b) Describe four types of hazard which arise from the use of chemicals
Discuss how transmission electron microscopy (TEM) can provide information complementary to that which can be obtained from standard X-ray or neutron diffraction methods, giving suitable examples.
Determine the d-spacing (Å), to 3 decimal places
Present/display a research paper with the topic Introduction to Petroleum Engineering,giving preferences to the changes that are generated through the discipline in our world today.
Calculate the energy required to heat 1kg of CO 2 from 400ºC to 600ºC at a constant pressure of 1atm using:-
Evaluate particle diameter at different terminal gas velocities
Draw T-S diagram of the cycle.
Using the information in the above table to show how the specific volume of each liquid varies with temperature. You should plot a graph for each liquid and use this graph to estimate the exact value of a at 50°C for each liquid.
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