A liquid at 300 F flows through a 3-in. steel pipe (schedule 40) covered with a ½ in. thickness of asbestos insulation. The ambient temperature is 80 F. The inside surface film coefficient is 40 Btu/hr-sq ft-F, and the outside surface film coefficient is 4.0 Btu/hr-sq ft-F. The thermal conductivities of steel and asbestos can be taken as 25 and 0.11 Btu/hr-ft-F respectively. What's the heat loss per foot length of the pipe?

in viscous damping free vibration response what has the most powerful effect among m, c, k and initial condition? please write the reason.

A 2,900 square foot retail (sales) space located in Lewiston, ID is to be maintained at 69ºF DB. The total heating load for the space is calculated to be 130 MBH. The space is supplied by a heating only unit and is applied as a single zone configuration. Assume there are 45 people in the space.

What is the heating load on the unit coil?

Compare and contrast spin recovery procedures of two different aircraft. What makes the recoveries different for each aircraft?

A steel has a modulus of elasticity of 29,000 ksi and an elastic limit of 52 210 psi. A rod of this material and cross section of 0.0186 in2 and 36 in length is fastened vertically to a beam with a load of 410 lb at the opposite end. Determine: a) If this load is removed, will the bar return to its initial length? Justify the answer; b) The unitary deformation of the bar in these conditions; c) The minimum diameter of a bar of this material and that does not present permanent (plastic) deformation when subjected to a load of 11,500 lbs.

answers :a) 157.17 MPa  360 MPa (SLE) b) 0.076 %; c) 0.0134 m.

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

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.

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.   

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?

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

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

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

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.

A long cylindrical object with diameter D=100cm (k=400 W/mK, C­_p = 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?