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- A convective kerosene heater is tested in a well-mixed 60 m3 chamber having an air exchange rate of 0.4 ach. After 2 hours of operation, the nitric oxide (NO) concentration reached 6.5 ppm. Treating NO as a conservative pollutant, estimate the NO source strength of the heater (in mg/hr). Assume: Standard Temp and Pressure2. Consider a "tight" 300 m3 home with o.2 ach infiltration rate. The only source of CO in the home is the gas range and the ambient concentration of CO is zero. Suppose there is no CO in the home at 6 pm, but then the oven and two burners are on for 1 hour. Assuming the air is well mixed in the house, estimate the CO concentration in the home at 7 pm and again at 10 pm.A convective kerosene heater is tested in a well-mixed 60 m3 chamber having an air exchange rate of 0.3 ach. After one hour of operation, the nitric oxide (NO) concentration reached 3 ppm.Treating NO as a conservative pollutant, estimate the NO source strenght of the heater (in mg/hr).Assume: 25 oC and 1 atm
- Consider a 98% efficient ESP which removes, fly ash from combustion gases flowing at 100 m3/sec. The resistivity of the ash is 1.0 (10)10 ohm-cm. Calculate the total collection area required.A control, process for a glass furnace will remove boron from the 1400 oF furnace by cooling the exhaust to 275 oF in an evaporative cooler to condense B2O3. The cooled exhaust will then pass through a ro verse-jet filter to remove suspended dust, including the B2O3 particulates. Draw a preliminary flow sheet for the process, indicating any auxiliary equipment needed, List any operating difficulties you think might arise with this system.Consider a 300 m3 home with an infiltration rate of 0.2 ach, temperature of 25oC, and pressure of 1 atm. Assume carbon monoxide (CO) is a conservative pollutant, the only source of CO in the home is the gas range, and the ambient concentration of CO is always zero. Suppose there is no CO in the home at 6 PM, but then the oven and two burners are turned on for one hour. Estimate the CO concentration in the home at 7 PM and again at 10 PM (3 hours after turning off the range). Use Table 7.13 as needed Does this system exceed the 8-hr NAAQS for CO (9 ppm(v))?
- conversion: Given 200 ppmv SO2 (@STP), what isthe SO2 emission rate in lb/hr.Refrigerant-134a at 300 psia has a specific volume of 0.2235 ft³/lbm. Determine the temperature of the re- frigerant based on (a) the refrigerant tables, (b) the ideal-gas equation, and (c) the generalized compressibility chart.Why positive corona is used for all indoor air-cleaning applications even though it is less efficient?
- Question 2. A coal fired power station requires an ESP for dust removal from the flue gas. The influent flu gas has a concentration of 5200 mg/m3 of dust particles and a flow rate of 150 m3/s. The smallest particles in the gas stream are 1.5 um in diameter, and all particles have a dielectric constant of 5.5. The emission standard is 50 mg/m3. Assume a plate-to-plate spacing of 30 cm and an applied voltage of 15,000 volts. Each plate is 20 m long and 15 m high. Estimate –a) The particle drift velocityb) The required collection-plate area and number of plates required.Assume – Standard temperature and pressure.Design a trickling filter system for BOD removal without the nitrification requirement, to treat municipal wastewater with an average flow of 200 m3/d (Qin) and influent BOD of 200 mg/L and Ammonium (NH4-N) of 42 mg/L. Make appropriate assumptions and use the design indicators for plastic media filters as given below. What are the possible effects of the peak flow of 1.5 times occurring once in a month? Volumetric loading rate (Bv)= 0.5 kgBOD/m3.d Volumetric loading rate for NH4-N (Bv, NH4-N)= 0.2 kgNH4-N/m3.d Hydraulic loading rate (qh= Q/AR)= 1.2 m/h Recirculation ratio (Qr/Qin) = 0.5Provide a reasonable design for a 99,4% efficient ESP treating 30,000 m3/mm of gas, The dust has a resistivity of 7.1(10)10 ohm-cm.