Research paper on: Features and benefits of condensing oil furnaces, in one paragraph
In: Mechanical Engineering
I need a research paper on: Electronic controls for oil burners, in one paragraph.
In: Mechanical Engineering
The city of La Paz in Bolivia lies at an altitude of 3650m above sea level. Average atmospheric pressure is 62.3 kPa, average daytime temperature is 8.8 oC, and average relative humidity is 55%. The power station at La Paz airport uses a Baltimore Aircoil 3501A cooling tower; water coming from the condenser cooling circuit enters the top of the tower at 144 litres/s at 36 oC. Moist air at average ambient conditions enters the bottom of the tower and exits at the top at 12 oC with a relative humidity of 100%. The change in air pressure between inlet and outlet is negligible.
(a) If the evaporative cooling process in the tower loses 4% of the incoming water stream, what is the temperature of the cold water leaving the bottom of the tower?
(b) Under these conditions, what is the cooling capacity of the tower in tons? The rated capacity of the tower at normal ambient conditions (i.e. sea level, 21 oC wetbulb) is 500 tons: why is it operating so far from this point in La Paz?
(c) What is the volume flow rate of dry air leaving the tower?
In: Mechanical Engineering
Water enters a circular tube whose walls are maintained at constant temperature at a specified flow rate and temperature. To compute the rate of heat transfer between the walls and the fluid, using the flow Nusselt number the following temperature difference is used;
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a. The difference between the inlet and outlet water bulk temperature |
b. The difference between the inlet water bulk temperature and the tube wall temperature |
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c. |
The log mean temperature difference |
d. The difference between the average water bulk temperature and the tube temperature |
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In: Mechanical Engineering
the standard SI unit of dynamic viscosity n is N * s/m2 Derive the unit of kinematic viscosity v= n/p is m2/s, where p is density. The acceleration due to gravity g has the unit of m/s2.
In: Mechanical Engineering
Metallic materials used in aeronautical industry can be susceptible to pitting. Select a metal that is known to pit and describe environmental conditions and corrosion-influencing factors that can cause pitting of this selected metal when used in the aeronautical industry.
Describe the relevant mechanism of atmospheric corrosion that takes place in that scenario.
In: Mechanical Engineering
Steel is used as a roofing material in a chemical refinery located in Darwin, Northern Territory. Estimate atmospheric corrosion rate of steel by employing the following approaches
ISO 9223
Bilogarithmic law
ISO CORRAG
Discuss the general trend of the results and, if any, the discrepancies among various methods.
Citation to scientific literature and any necessary sources for climatic conditions are encouraged
In: Mechanical Engineering
In: Mechanical Engineering
Discuss the hazards that can effect from control valve failure
In: Mechanical Engineering
Two water reservoirs are joined by a sharp ended flexible pipe 100 mm in diameter and 36 m long. The ends of the pipe differ in level by 4 m. The surface level of the upper reservoir is 1.8 m above the pipe inlet whilst that of the lower reservoir is 1.2 m above the pipe outlet. At a position 7.5 m horizontally from the upper reservoir, the pipe is required to pass over a barrier. Assuming that the pipe is kept straight between the inlet and the top of the barrier and that the average friction factor is 0.01, find the greatest height to which the pipe may rise at the barrier if the absolute pressure in the pipe is not to drop below 40 kN/m2. You may ignore losses at the bends in the pipe but all other losses should be included in the calculation. Use values for k as given in the lecture notes. Take atmospheric pressure as 1.013 bar. (ans.: 6.04 m above inlet)
In: Mechanical Engineering
A pipe, 900 m long and 200 mm in diameter discharges water to the atmosphere at a point 10 m below the inlet level. With an inlet pressure of 40 kPa gauge, the flow rate is 40 litres/sec. At a point half way between the pipe inlet and outlet, a new tapping is made from which water is taken at a rate of 18 litres/sec. To what value must the inlet pressure be raised in order to maintain the same discharge rate from the end of the pipe? You may assume that the pipe remains full of water and that the average friction factor is not altered by making the new tapping. (ans.: 115.1 kN/m2)
In: Mechanical Engineering
A pressure vessel support bracket is to be designed so that it can withstand a tensile loading cycle of 0-500 MN/m2 once every day for 25 years. Which of the following steels would have the greater tolerance to intrinsic defects in this application: (i) a maraging steel (Ke-82 MNm-, C= 0.15 × 10-11, m-41), or (ii) a medium-strength steel (Kic 50 MN m1, C0.24x 10-", m 3.3)? For the loading situation a geometry factor of 1.12 may be assumed.
In: Mechanical Engineering
Write 10 steps to make more efficient manufacturing process than vacuuming machine we used?
In: Mechanical Engineering
Q3 An engineer in the maintenance department after presenting a Gh¢5000 scheduled activities to management was given Gh¢4600 to carry out the exercise. Explain what he can do in order to perform the said exercise on time?
In: Mechanical Engineering
A 1000kg uniform wheel shaped piece of steel is at rest. A 1kW engine turns the wheel with its full power.radius of disk is .3m
What rpm will it reach in 1 hour, 6 hours, 12 hours.
Assume no friction from air or bearings. Assume the most efficient continutously variable transmissions if needed.
After 12 hours of charging, how much energy will the wheel produce in kW
In: Mechanical Engineering