Given: Open water source Net radiation = 300 W/m2 Air temperature = 25 °C Density of water = 997 kg/m3 Assume value of zero for sensible heat, ground heat flux, heat stored in water body and advected energy. Use Ay = 2501 –- (2.37T) Calculate the evaporation rate (in mm/day) using Priestly and A Taylor approximation, if = 0.692. A+y 6.42 None of the choices 9.58 9.41 6.24
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- What is the Molecular weight of a certain volatile liquid which is placed in 225 g flask which has total capacity volume of 252.17 mL. After the liquid was heated to 96.7 oC the gass volatilized and the weight of the flask measure 227.33g. What is the could be the MW of the volatile sample?(a) Water in vadose zone contains chlorobenzene of concentration 40 mg/L. What is the equilibrium concentration soil air in contact with this solution? (b) An aquifer with porosity 0.3 has distribution coefficient of TCE as 100 L/kg. What fraction of TCE is in aqueous phase and sorbed phase of the soil?23 ft^3 of air was drawn from a ventilation duct and measured by means of a dry gas meter. the meter's temperature averaged 60 F and the meter gage pressure was -1.9" H2O. Barometric pressure during the sampling was 752 mm Hg. Calculate the volume in standard cubic feet and in standard cubic meter (25C, atm) this is an ideal gas problem
- Sulfur dioxide (A) diffuses through a stagnant layer of air (B) of 2 cm thickness at 45oC and 1.2 bar total pressure. The partial pressures of SO2 on the two sides of the air layer are PA0 = 0.85 bar and PAL =0.15 bar, respectively. Considering Air is a non-diffusing component and DSO2-Air = 3.5×10-5 m2/sec, calculate: 1) The molar flux of SO2 with respect to an observer moving with the mass average velocity.You are hardening a tool made of BCC iron by increasing the carbon concentration at its surface by heating the tool in the presence of a carbon-rich gas (for example methane). A heat treatment at 600oC for 100 minutes results in a carbon concentration of 0.75 wt% at a position 0.5mm below the surface. How long would it take to obtain a carbon concentration of 0.75 wt% at a position 0.5 mm below the surface if the heat treatment were conducted at 900oC? Hint: (use the simplified version of Fick’s second law )What could be the assumption when the MW of the sample does not match calculated molecualr weight from ∆Tb = mKb despite carefull data processing? The sample is not the compound of interest There are some impurities that affeced the boiling temperature Low heat is used to achieve boiling condition none of the assumption is valid 1 and III are valid assumptions all are valid assumptions I and II are valid assumptions
- Compute the volume percent of graphite VGr in a 3.8 wt% C cast iron, assuming that all the carbon exists as the graphite phase. Assume densities of 7.9 and 2.3 g/cm3 for ferrite and graphite, respectively. Answer in Vol%Show solution : if 12m³ of nitrogen at constant temp of 30°c and 12kpa abs is permitted to expand to 30m³, what is the resulting pressure? Ans. 50 kpaA Site evaluated for a wind farm is observed to have steady winds at a speed of 8.5m/s. Determine the wind energy (a) per unit mass, (b) For a mass of 10 kg and (c) For a flow rate of 1154 kg/s of air.
- Cereal is being dried in a vertical drier by air flowing countercurrent to the cereal. To prevent breakage of the cereal flakes, some of the exit air from the drier is recycled back to mix with the the moist fresh air. For each 1000 kg/hr of wet cereal fed to the drier, calculate the input of moist fresh air in kg/hr and recycle rate in kg/hr. The available data on stream compositions is (fractions): For water: Fresh air: 0.0132 Wet cereal: 0.200 Exit air: 0.263 Dried Cereal: 0.050 Air entering Dryer: 0.066Calculate volume and weight of sludge generated in thickener by chemical coagulation.Data given as:Wastewater flow: 10000 m3/dInlet concentration: 1100 mg/LFeCl3 added: 500 mg/LCaO added: 400 mg/LOverall particle removal efficiency: 80%Sludge’s specific gravity: 1.05Sludge’s moisture content: 95%Assume STANDARD chemical reactions and their product’s behavior as:FeCl3 + H2O → Fe(OH)3CaO + H2O → Ca(OH)2An igloo or Eskimo hut is built in the form of a hemispherical shell with an inside diameter of 12 ??. If the igloo is constructed of snow blocks having a uniform thickness of 2 ?? and weighing 40 ?? ??? ??. ??, find the weight of the igloo, neglecting the entrance. Also, if fresh air contains 0.04 per cent carbon dioxide, find the amount of this gas in the igloo when freshly ventilated.