A tank initially holds 140 L of salt water with density of 1.05g/cm3. Over a 30-minute period, both hot and cold water enter (Q[hot]: Q[cold]= 3:1) the tank while mixed warm water is drained from one outlet. The discharge rate at the outlet is 25L/min and the volume of the water left in the tank at the end of 30 minutes is 40 L. What is the mass flow rate of cold water entering.

For a first order process G(s)= 4/(s+0.5):

(a) Qualitatively sketch the pattern of the Bode diagram for this process, and indicate the limiting behaviors( i.e., the slopes and values as s --> 0 and s --> infinity) of ARn( the normalized amplitude ratio) and Phi ( the phase shift) in the plots.

(b) Will a P-only control possibly make the process unstable? Show your reasoning based on the Bode stability criterion.

(c) What if a delay term e^-5s is included, i.e., G(s) = - 4e^-5s/(s+0.5, will a P-only control possibly make the process unstable (you don't need to determine the exact value of the ultimate controller gain Kcu)? Show your reasoning based on the Bode stability criterion.

Urea was hydrolyzed with an enzyme at a fixed concentration of 50 μM and the following data were obtained. Using Lineweaver-Burk plot determine the kinetic parameters.

Compute the carbonaceous and nitrogenous oxygen demand in mg/L for a wastewater containing

a) 100 mg/L C₉N₂H₆O₂

b) 100mg/L C₆N₂H₄O

c) 100mg/L C₁₂N₄H₆O₂

d) 100mg/L C₁₀N₂H₈O₂

Q. Spherical glass particles (12 mm diameter and 2500 kg/m 3 density) and spherical metal particles (1.5 mm diameter and 7500 kg/m3) are falling in water (density= 1000 kg/m3) .

(1) Calculate the terminal falling velocities of glass and metal particles in water for a constant friction factor of 0.22.

(2) At what water velocity will fluidized beds of glass particles and metal particles have the same bed densities?

The relation between fluidization velocity (u_c), terminal velocity (u_t) and bed voidage (e) for a spherical particle is given by the equation (uclu_t) = e^2·3

Air at 35°C and 33% relative humidity is used for drying a food product. The air is first heated to 90°C and then cooled adiabatically to an exit dry bulb temperature of 40°C. (a) How much moisture did the air pick up? (b) Calculate the change in enthalpy from the initial unheated air to the final moist air. (c) If the food is dried from 85% moisture to 20% moisture (both on a wet basis) at an inlet flow rate of 50 kg/h, what mass of air must be circulated through the dryer?

100 mol of oxalic acid (H2C2O4) is burned (95% conversion) at atmospheric pressure and 99 °C with 10 % excess air so that the selectivity of CO2 relative to CO is 4. The chemical reaction equations for the combustion of oxalic acid are given as: Reaction 1 (desired): ??2??2??4+1 2??2→2????2+??2?? Reaction 2 (undesired): ??2??2??4→2????+1 2??2+??2??
a) Draw and completely label a flowsheet of this process, clearly assigning variable names to all known and unknown quantities. (6 pts) b) What are the molar flow rates of all species leaving the combustion chamber? (20 pts) c) What is the yield of CO2? (6 pts)
For parts d), e) and f), assume water is the only species that can condense and if you cannot solve for the molar flow rates of the product gas, assume equimolar compositions of the six product gas species.
d) What is the relative humidity of the product gas? (4 pts) e) What is the dew-point pressure of the product gas? (6 pts) f) What is the dew-point temperature of the product gas, to the nearest 1 °C? (6 pts

1. An inventor thinks he has developed a new catalyst that can make the gas-phase reaction

Proceed with 100% conversion. Estimate the heat that must be provided or removed if the gases enter and leave at 500°C.

why is fractionating column packed with glass beds more efficient that a vigreux column of the same length and same diameter additionally why does the column need be wrapped with aluminum foil

Write 3 paragraphs (5-7 sentences) describe:

1.What Ocean Acidification is and what causes it

2. What are the affects of acidification to the ocean environment and marine life.

3. What does NOAA stand for and what do they do?

Can someone please explain how can someone find how to find the adiabatic flame temperature in Kelvin when liquid methane reacts with liquid oxygen?

Please show the calculations.

THERMODYNAMICS EXPERT

You have a 0.1 mole/sec stream of propane at T = 400 K and P = 7.5 MPa. You isothermally and reversibly compress the pressure to 10 MPa using a intercooler

compressor. Find the amount of heat dumped into the environment and the amount of work needed to compress the propane.

You are working on a feedwater system for a chemical engineering plant. A section of the pipe passes through a stream of width ? = 4 m which flows at constant temperature and velocity (?∞ = 12 °C,?∞ = 1.7 m⁄s). You need to determine the temperature change of the feedwater as it passes through the stream. The feedwater is 20 °C as it enters the section passing through the stream. The pipe diameter is 4 inches and the volume flowrate is 50 GPM.

a. Calculate the Reynolds number of the water flowing inside of the pipe. Is the flow laminar or turbulent? (We can continue with this problem either way)

b. Calculate the heat transfer coefficient in the pipe. The thermal conductivity of water is 0.6 W/m-°C and the Prandtl number is 7.5. Use an appropriate laminar flow correlation, or assuming fully developed turbulent flow, the Dittus-Boelter correlation is appropriate: ?̅̅̅?̅ ? = ℎ̅? ? = 0.023 ∗ ??? ( 4 5 ⁄ ) ?? (0.3)

c. Calculate the temperature change of the water assuming the pipe wall temperature is equal to the stream temperature. The specific heat of water is 4200 J/kg-°C. Use the following transformation for integration: ?(?) = (?(?) − ?∞)

d. Calculate the total heat transfer rate.

1. A food processing plant makes soup in a continuous process with a steady flow of product into and out of a large kettle. The soup is maintained at a certain temperature by heating the kettle with a coil of steam pipes. The large size of the kettle means the entering product remains in the kettle for a long time. Draw a graphic and describe how the plant could use feedback, feedforward, and cascade control to maintain a constant temperature. Which control scheme would provide the tightest control?