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1. A heat pump with COP = 4 uses 1 kW of power input to heat a 25?C room, drawing energy from the outside at 15?C. Assume the high/low temperatures in the heat pump are 45?C/0?C. Find the total rates of entropy into and out of the heat pump, the rate from the outside at 15?C, and the rate to the room at 25?C.
2. A window receives 500 W of heat transfer at the inside surface of 20?C and transmits the 500 W from its outside surface at 2?C, continuing to ambient air at -5?C. Find the flux of entropy at all three surfaces and the window's rate of entropy generation.
A 3.60-g lead bullet at 28.0 degrees C is fired at a speed of 230 m/s into a large block of ice at 0 degrees C, in which it embeds itself. What quantity of ice melts?
When loaded, the beam carries a 10-kN/m uniformly distributed load. Neglecting the weight of the cable, approximate the following: (a) The change in length of the cable when the beam is under load
A ciricular sewer is laid on a slope of 0.5%. What diameter is required if the concrete pipe is to carry 25 cfs If the desired design mean suction velocity is between 3 and 7 ft/s, is the design acceptable
For the case of the uniaxial compression, determine the maximum shear stresses that exist at that piont. Identify the planes on which they act by drawing the orientation of the element for these shear stresses. Show all stresses that act on the eleme..
A reverse osmosis plant desalinates 5*10^6 L/day of feedwater containing 1500 mg/l of salt, yeilding 3*10^6L/day of product water with 75 mg/l of salt. What would be the salt concentration be in the brine?
A cantilevered W12X136 (ASTM-A36) steel member beam is 18 feet in length. if a concentrated load of 12 kips is applied at a point 6.25 feet from the beam's free end, use the superposition technique to find
This uniformly reduces 4X10-4 cm / s to a depth of 22 meters. If the water level is about 3 feet below the surface, determine the saturated hydraulic conductivity of the layer.
You are asked to design a horizontal curve for a two-lane road. The road has 12-ft. lanes. Due to expansive excavation, it is determined that a maximum of 34 ft. can be cleared from the road's centerline toward the inside
A clean-earth trapezoidal channel with a bottom width of 1.8 m and a side surface slope 1:1 is to drain water uniformly at a rate of 8 m^3/s to a distance ok 1 km. If the flow depth is not to exceed 1.2 m,
Essex Company has a price of $55/share today, and you purchase 2 calls with a $68 strike price for $2.75/share. (Each call consists of 100 share options.) In 6 months, when your options are about to expire, you exercise your options. The stock is tra..
A flowrate of 3.5 ft^3/s is to be maintained in a horizontal aluminum pipe ( E = 5 * 10 ^-6 ft). The inlet and outlet pressures are 65 psi and 30 psi, respectively, and the pipe length is 500ft. Determine the diameter of the pipe.
A water treatment plant is being designed for a flow of 1.6 m^3/s. How many rapid sand filters, using only sand as the medium, are needed for this plant if cross-sectional area of each filter is 10 m x 20 m?
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