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A roof-cooling system, which operates by maintaining a thin film of water on the roof surface, may be used to reduce air-conditioning costs or to maintain a cooler environment in non-conditioned buildings. To determine the effectiveness of such a system, consider a sheet metal roof for which the solar absorptivity as is 0.50 and the hemispherical emissivity e is 0.3. Representative conditions correspond to a surface convection coefficient h of 20 W/m2 · K, a solar irradiation G s of 700 W/m2, a sky temperature of - 10°C, an atmospheric temperature of 30°C, and a relative humidity of 65%. The roof may be assumed to be well insulated from below. Determine the roof surface temperature without the water film. Assuming the film and roof surface temperatures to be equal, determine the surface temperature with the film. The solar absorptivity and the hemispherical emissivity of the film-surface combination are aS = 0.8 and e = 0.9, respectively.
he concentration of carbon in an iron-carbon alloy is 0.15 wt%. What is the concentration in kilograms of carbon per cubic meter of alloy
The path of motion of a 7-lb particle in the horizontal plane is described in terms of polar coordinates as r= (3t+2) and theta=(0.2t^2-t) , where t is in seconds. Determine the magnitude of the unbalanced force acting on the particle when t=3s.
A chlorination process is to be used to disinfect a wastewater treatment plant effluent. The plant treats 1.8MGD (million gallon per day). The water entering this unit has about 4500mg/L of coliforms, and the effluent target is 0.1 mg/L of coliforms.
An ocean outfall diffuser that discharges treated wastewater into the Pacific Ocean is 500m from a public beach. The wastewater contains 105 coliform bacteria per milliliter. The wastewater discharge flow rate is 0.3 m3/s.
A construction company requires to know how much of additives A and B to use to prepare concrete to be used in a freezing environment (northern location). The concrete mix should contain a minimum concentration of nitrate and sulphate.
An airport runway has a capacity of 60 operations (ie landing and take-offs) per hour. In a particular hour, there are 30 landings evenly spaced over the hour.
determine the amplification factor and the magnitude of steady state response (for deflection at A), when a horizontal force of 20Sin(8t) (N) is applied at B. (L= 250 mm, distance from center of mass to C = 40mm)
A clay ball (m=0.82 kg) is thrown at a metal target (M=1.72 kg) that is suspended from a cable. The ball is released 1.5 m above teh ground at an angle of 32 degrees. There is a completely inelastic collision between the ball and the target at a heig..
An S 12x40.8 of A36 steel in a building is supported as a simple beam having a span equal to 17ft 6in. and carries a uniform load equal to 1.60 klf, which includes the weight of the beam over the entire span.
An activated sludge process receives 4000m^3 / day containing 120 mg BOD /L from the primary settling tank and 3500 m^3/day Containing 25mg BOD/L from the secondary settling tank.
A particle of mass 200kg is lifted up vertically by a force of 104N. Assuming the acceleration due to gravity is 10meterper.secondsquare, write a program to calculate the upward acceleration of the particle.
A river is 6m deep. The riverbed material has a saturated unit weight of 19.5kN/m3. What is the effective vertical stress 12m below the water surface. Assume the water is static and assume a datum at the water surface.
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