Develop a single or set of event trees to describe the escalation mechanism that would lead to an impairment of a TR from a fire or explosion in an adjacent module. Your event tree(s) should include the direct effects of fire and explosion and escalations which may lead to impairment of the TR by fire, smoke or structural failure. Present your event tree(s) and discuss all underlying assumptions
In: Mechanical Engineering
A laboratory drying oven has a composite wall made of Plane Wall 1 and Plane Wall 2 as shown above. A thin film heater (surface heat source, thickness negligible) is sandwiched between the two plane walls 1 and 2. Plane Wall 1 has a thickness L1 = 0.02 m and a thermal conductivity k1 = 0.05 W/m·K, while Plane Wall 2 has a thickness L2 = 0.01 m and a thermal conductivity k2 = 0.1 W/m·K. During steady state operation, the oven air maintains a constant temperature T∞,2 = 60 ˚C, while the heater layer is controlled at a temperature of TH = 90 ˚C. The drying oven is put inside a room where the ambient air temperature T∞,1 = 30 ˚C, and the heat transfer coefficient between the outer surface of the Plane Wall 1 and the ambient air h1 = 3 W/m2 ·K. First, assume the heat transfer coefficient between Plane Wall 2 and the oven air is h2 = 3.5 W/m2 ·K. For simplicity, assume that the drying oven has 4 side walls (each is 0.5 m long and 0.5 m high), and both the top and bottom surfaces of the oven are perfectly insulated. Consider the oven air and ambient air as an ideal gas with density ρ = 1.13 kg/m3 , specific heat capacity cp = 1000 J/kg·K, kinematic viscosity v = 15x10-6 m2 /s, thermal conductivity ka = 0.027 W/m·K, volume expansion coefficient β = 3.4x10-3 (1/K) and a Prandtl number of Pr = 0.71. Contact resistances do not occur. Additionally, all effects of thermal radiation may be neglected.
In: Mechanical Engineering
1.The population of India in the year 2000 was 1 billion and it increased exponentially at a rate of 1.6% per year. If the growth rate is maintained, what will be the population in the year 2020? If the growth rate is decreased to 1.2% per year from 2020 onwards and is maintained at that level, what will be the population in the year 2050? Assuming the average human exhales 2.3 pounds of carbon dioxide on an average day, what is the total amount of Carbon released in the atmosphere annually by human exhalation (in billion tonnes) around the year 2020?
2.Calculate the suspended particulate concentration (in μg/m3) in a sample collected through a hi-vol. sampler: Weight of clean filter = 5.00 g, Weight of the filter after exposure for 24 hours = 5.38 g, Average air flow = 2000 m3 in 24 hours.
In: Mechanical Engineering
A nozzle at standard sea level pressure has two water manometers measuring the static pressure at two points 1 and 2. The upstream diameter D1 is 8 in and the downstream diameter D2 is 2 in, respectively. Air flows through the nozzle, and the air and water temperatures are 60◦F. If the upstream manometer has a column height of h1 = 1/32 in and the downstream manometer has a column height of 8.0 in, what is the mass flow rate through the nozzle?
In: Mechanical Engineering
Imagine you are a pipeline company trying to sell a new project to a shipper of oil for a new refinery in Grand Forks. In order to prepare for selling this idea to shippers and hopefully win the contract, you need to calculate the average cost per unit ($/barrel) of oil to ship over this line in the first year; taking into account Capital, Operating and Energy Cost. This is a competitive proposal, so you will want to make sure your price is as low as you can make it!! The refinery is scheduled to take 300,000 barrels per day of Bakken Crude at typical temperures. Pipeline construction costs average $100,000/foot mile. A foot mile is 1 mile of 12 inch pipe. 2 miles of 16” pipe would be 2.6667 foot mile, and so on. The price includes all pipe and installation and is based on using X-42 and schedule 20 pipe. You have the option of increasing the pipe wall thickness to schedule 40 for an additional 10% and schedule 80 for 20% more than schedule 20. You also have the option of increasing the pipe strength to X60 for an additional 10% or X-72 for 20% above X-42. Each pump station will cost $2,000,000 +$2000/hp of pump. The inlet pressure of pumping stations should not fall below 400 psi. Pipeline flows entirely through class I locations except for 10 miles located in a class IV location. You have the option of bypassing the class IV location by running the pipeline an additional 50 miles. Cost of electricity to drive pumps is $.08 per kWh. (1 kW for 1 hour) Annualized Capital costs can be assumed to be an estimated by a fixed charge rate of .15 (meaning it costs 15% of the total project cost each year to cover debt and equity used to finance the construction) The fixed O&M is $0.10 per inch mile The variable O&M is $0.25 per barrel Hint: Partial credit will be awarded based on the following scale: Please note
In: Mechanical Engineering
A simple steam power cycle uses solar energy for the heat input. Water in the cycle enters the pump as a saturated liquid at 40°C, and is pumped to 2 bar. It then evaporates in the boiler at this pressure, and enters the turbine as saturated vapour. At the turbine exhaust the conditions are 40°C and 10% moisture. The flow rate is 150 kg/h. Determine (a) the turbine isentropic efficiency, (b) the net work output (c) the cycle efficiency, and (d) the area of solar collector needed if the collectors pick up 0.50 kW/m 2
In: Mechanical Engineering
Product Design and Development (6th Edition)
Develop several concept sketches for a common product. Try designing the product form both “from the inside out” and “from the outside in.” Which is easier for you? Possible simple products include a stapler, a garlic press, an alarm clock, a reading light, and a telephone
In: Mechanical Engineering
Design a muff coupling to connect two shafts transmitting 40 kW
at 120 r.p.m. The permissible shear
and crushing stress for the shaft and key material (mild steel) are
30 MPa and 80 MPa respectively.
The material of muff is cast iron with permissible shear stress of
15 MPa. Assume that the maximum
torque transmitted is 25 per cent greater than the mean torque.
In: Mechanical Engineering
A long cylindrical object with diameter D=100cm (k=400 W/mK, Cp = 400 J/kg K, density = 9000 kg/m3) is put into an oven of 1100 K with convective
heat transfer coefficient h of 50 W/m2 K. The initial temperature of this object is 300 K. How much time does it take for the center of the object to reach
700K? How much time does it take for the surface of the object to reach 700K?
In: Mechanical Engineering
In: Mechanical Engineering
In: Mechanical Engineering
In: Mechanical Engineering
consider the IVP ( cos(x)sin(x) - xy^2)dx + (1-x^2)ydy = 0 , y(0) = 34
solve the IVP
answer))) 1156 = ???
In: Mechanical Engineering
What is the best mechanical pencil lead size (i.e. 0.5, 0.7 etc) and lead type (I.e. Hb etc) for engineering drawing (isometric and orthogonal) ?
In: Mechanical Engineering
Hydrolevel vs. ASME case study
What can engineering societies do to defend their goods once a conflict of interest is exposed?
Have ASME's reviewed conflict-of-interest procedures addressed the difficulties fully? Why or why not?
In: Mechanical Engineering