Steady State Radon Concentration in Basement of House

Radioactive radon gas (222Rn) enters an average building at a rate of 4 picocuries per second per square meter of foundation area. Consider a house with a foundation of 200 square meters and a volume of 1000 cubic meters. Assume the house if well designed for energy conservation so that the ventilation rate is low and only one tenth of the air in the house is exchanged with outdoor air every hour. What will be the average steady state concentration of 222Rn (in Ci/cubic meter) in the house?

Wind Turbine Energy Problem

a)Assume a wind turbine with a hub 50 meters above the ground, a rotor diameter of 75 meters and a wind-conversion efficiency of 25 percent. The turbine operates in an area with an average wind-power density of 650 watts/sq meter at 50 meters altitude. How much electricity (kwH) can the turbine generate per year? b) Wind densities greater than or equal to 500 watts/sq meter at an altitude of 50 meters are present on 1.500 percent of the land area of the US. If, on average, wind farms contain 8 turbines/sq km, how much electricity (kwH/yr) could be generated from these wind turbines? (The area of the US is 7,827, 989 sq km).

What technology or combination of technologies would you recommend for treating Sulfur dioxide contaminated air streams?

What technology or combination of technologies would you recommend for treating Sulfur dioxide contaminated air streams? Could you include a brief description of the recommended technology so I can understand:

Work, Power and Enerhgy: Wind Turbines

Could you please explain what formula and step are involved and please provide (example) problem if possible? a)Assume a wind turbine with a hub 50 meters above the ground, a rotor diameter of 75 meters and a wind-conversion efficiency of 25 percent. The turbine operates in an area with an average wind-power density of 650 watts/sq meter at 50 meters altitude. How much electricity (kWh) can the turbine generate per year? b) Wind densities greater than or equal to 500 watts/sq meter at an altitude of 50 meters are present on 1.500 percent of the land area of the US. If, on average, wind farms contain 8 turbines/sq km, how much electricity (kWh/yr) could be generated from these wind tur... click for more

Contaminated Air Stream

What technology or combination of technologies would you recommend for treating the following contaminated air streams? Include a brief description of the recommended technology: (a) 0.05 to 20 micron particulates along with 800 ppmv of chlorinated solvent