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Determined to reduce the $7 per week cost associated with heat loss through their patio window by convection and radiation, the tenants of Problem 9.18 cover the inside of the window with a 50-mm-thick sheet of extruded insulation. Because they are not very handy around the house, the insulation is installed poorly, resulting in an S = 5-mm gap between the extruded insulation and the window pane, allowing the room air to infiltrate into the space between the pane and the insulation.
(a) Determine the window heat loss and associated weekly cost with the ill-fitting insulation in place. The insulation will significantly reduce the radiation losses through the window. Losses will be due almost entirely to convection.
(b) Plot the heat loss through the patio window as a function of the gap spacing for 1 mm ≤ S ≤ 20 mm.
Give the approximate minimum temperature at which it is possible to austenitize each of the following iron-carbon alloys during a normalizing heat treatment:
The 50-turn coil in the configuration of Figure P12.1.3 is rotated at a constant speed of 300 r/min. The axis of rotation is perpendicular to a uniform magnetic flux density of 0.1 T. The loop has width w = 10 cm and length l = 1 m.
A well is producing from a saturated oilreservoir with an average reservoir pressureof 3000 psig. Stabilized flow test dataindicates that the well is capable of producing400 STB/day at a bottom-holeflowing pressure of 2580 psig.Calculate the remai..
. A typical home will use about 40. kWh of electricity per day (1 kWh 1 kilowatt hour; 1 kW 1000 J/s). Assuming 8.0 hours of useful sunlight per day, calculate the minimum solar panel surface area necessary to provide all of a typical home's e..
Develop and execute a PS pice program to analyze the circuit shown in Figure P2.5.1 to evaluate the node voltages and the current through each element.
Assuming that the two unsealed faces of the wood immediately jump to an equilibrium moisture content of 10 lb H20 per 100 lb of dry wood, determine the time for the moisture to penetrate to the center of the slab (2 in. from either face). Assume a..
Determine the heat of mixing AH of sulfuric acid in water and the partial specific enthalpies of H2SO4 and H2O for a solution containing 65 mass-% H2SO4 at 298.15 K (25°C)
the rate of flow to an ammonia synthesis reactor contains 25 mole ltbrgtnitrogen and the balance hydrogen. the flow
task onesummarize at least 4 methods of measuring temperature. only one of these methods may be one that was discussed
The reflux is saturated liquid with L/D = 3. Feed is on the optimal stage. Vapor-liquid equilibrium data are given in Exercise 7.29.
Calculate the change in output voltage for a 1658 change in the angle of the knee. Assume that a constant current of 7 mA is supplied to the transducer.
By using the mesh-current method, determine the voltage across the 1-A current source of the circuit of Figure P2.2.7, and verify by nodal analysis.
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