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.

A water treatment plant is being designed to process 50000m3/day of water. Jar testing indicate that an alum dosage of 40mg/l with flocculation at a Gt value of 2×104 produces optimal results at the expected water temperature of 150c . Determine: ØThe monthly alum requirement for the treatment plant ØVolume of the flocculation basin. ØThe power requirement ØProjected area of paddle blades [Take absolute viscosity at 150c  to be 1.139 ×10-3 Ns/m2 (Assume Vp 0.5m/s, CD 1.8) ]

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

(c) A filter has a head loss of 0.30 m when clean and 1.30 m after 24 hours of filtration at a rate of 1.5l/s. . Estimate the following if the filtration rate is changed to 2 l/s i. head loss immediately after backwash  ii. 10 hours later

Calculate the clean-bed head loss with Ergun Equation through a deep-bed anthracite filterwith 1.8m of ES = 0.95 mm media at a filtration rate of 15 m/h and a temperature of 15◦C.(Accept: κV = 228, κI = 4.4, and ε = 0.50. Values of ρW = 999 kg/m3 and μ = 1.14 ×10^-3kg/m・s).

Calculate the oxygen transfer rate (OTR) in a aeration reactor of volume 10m3 with an air flow rate of QG of 0.1m3/h while the oxygen concentration decreased from 6 g/L to 2.0 g/L.

The shake-deflate baghouse on the power plant has 12 compartments, each with 100 bags (cylindrical) that are 0.2 meter in diameter and 7 meter long. Total gas flowrate is 300,000 m3/h which carries 60 g/m3 of particulate matter concentration. The pressure drop of a freshly cleaned baghouse is found to be 250 Pa, while the bags are operated until the pressure drop of 750 Pa. The cleaning frequency is twice per hour. The particle collection efficiency is 95%, and filter

If (Qr/Q=120 percent of discharge), effluent BOD concentration=80ppm, volume of filter =825m3 , discharge =50L/sec , The influent BOD concentration equal: Choose one: a. 277.89 b. 277.2 c. 276 d. 275

The following data was obtained from a test program designed to evaluate a new diffused-air aeration system. Using these data, determine the value of KLa at 20oC and the equilibrium dissolved-oxygen concentration in the test tank. The test program was conducted using tap water at a temperature of 24oC. C, mg/L 1.5 2.7 3.9 4.8 6 7 8.2 dC/dt, mg/L.h 8.4 7.5 5.3 4.9 4.2 2.8 2 If the volume of the test tank used to evaluate the aeration system were equal to 100 m3 and the air flowrate were equal to 2 m3/min, determine the maximum oxygen transfer efficiency at 20oC and 1.0 atmosphere.

Liquid alum is delivered to a water treatment plant which contains 642.3 milligrams of alum per milliliter of liquid solution. Jar tests indicate that the best alum dose is 8 mg/L. Determine the setting on the liquid alum chemical feeder in milliliters per minute when the flow is 2.2 MGD.