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Flue gas from a methane combustor is at 1400 K and 1 bar pressure for stoichiometric combustion with air. Estimate the radiant heat transfer to the walls of a 0.50-m square duct maintained at 700 K. Assume the walls are black. Repeat the calculation for an excess air ratio of 2.
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An R-134 heat pump system obtains heat from a geothermal source and transfers 90,000 Btu/hr to an office building for space heating. The refrigeration cycle operates at pressure limits of 50 and 120 psia. If the compressor efficiency is 75%, find the power input (in hp and in Watts). (b) Find the COP for this heating application. If the building used electrical resistive heating rather than a heat pump, how much electrical power (in W) would be required? What is the percent increase in electrical power required (above that required by the heat pump) for the case of electrical resistive heating? (c) If the cycle operates 16 hrs/day and 30 days/month during the winter, and electricity costs 12 cents/kWH, how much money is saved per month by using the heat pump? (d) What are the working fluid temperatures in the two heat exchangers ? (For the condenser, we are mostly interested in the working fluid temperature during condensation because that is where most of the heat transfer occurs.)
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Calculate the total theoretical oxygen demand (mg/L) of a solution containing 750 mg/L of C5H7O2N. Also, calculate Carbonaceous ThOD and Nitrogenous ThOD separately
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1. What kinds of bonds would be expected in polymeric
materials?
2. State the difference between:
a) Linear and branched polymers.
b) Thermosetting and thermoplastic polymers.
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A distillation column with a partial reboiler and a total condenser is being used to separate a mixture of benzene, toluene, and cumene. The feed is 40 mol% benzene, 30 mol% toluene and 30 mol% cumene. The feed is input as a saturated vapor. We desire 99% recovery of the toluene in the bottoms and 98% recovery of the benzene in the distillate. The reflux is returned as a saturated liquid, and CMO can be assumed. Equilibrium can be represented as constant relative volatilities. Choosing toluene as the reference component, ?benzene-toluene = 2.25 and ?cumene-toluene = 0.210. Use the Fenske equation to find the number of equilibrium stages required at total reflux and the recovery fraction of cumene in the bottoms. b. For the distillation problem given in part a, find the minimum reflux ratio by use of the Underwood equations. Use a basis of 100 moles of feed/h. Clearly state your assumptions. d. For L/D = 1.25(L/D)min , find the total number of equilibrium stages required for the distillation problem presented in parts a and b. Use the Gilliland correlation. Estimate the optimum feed plate location.
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Questions relative to thermochem
a) I have steam at 400 degrees at 1 MPa flowing in a pipe. How much heat per kilogram would I have to remove to condense it into saturated liquid at 1 MPa?
b) I have 10kg of steam with an enthalpy of 2600kj/kg at 500 Kpa, what is the temperature of the steam? How much volume will the steam occupy?
I am confused about the steam state in question a), is that supposed to be superheated steam?
And how can I calculate those two Qs.
Cheers.
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- The gas phase oxidation of nitric oxide is given as; 2NO+ O2 --> 2NO2
?rO2 = k(CNO)^2 (CO)^2 kmoles/m3 .h
The feed stream containing 9% NO, 8% O2, 1% NO2 and 82% N2 is fed to an isothermal PF reactor with a rate of 10000 m3 /h at 450oC and 2 atm. The reaction rate constant is given as 0.7x104 (kmoles/m^3 )^-2 h^-1
a) Setup a stoichiometric table and express the concentration of each species in the reaction as a function of conversion by evaluating all constants.
b) Calculate the reactor volume in order to achieve 5 moles of NO2 per mole NO in product stream
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A saturated liquid feed composed of 30 % mol Benzene (B), 30 % mol Toluene (T) and 40 % mol p-Xylene (X) is separated by an isobaric column operating at 1 atm. The feed flow rate is 1 kmol/hr. Toluene is the light key with a mole fraction in the bottom stream equal to 0.1. The heavy key has a mole fraction in the distillate stream equal to 0.05.
1- Find the optimal design using shortcut methods tool of Aspen-HYSYS assuming a Reflux ratio, R, approximately equal to 1.6*Rmin.
2- We propose to separate this BTX mixture using a distillation train composed of two columns.
2a- Run the simulation using Aspen-HYSYS.
Hint: The design of first column, determined in Q.1, should be adopted. Also, you should determine a suitable design for the second column using shortcut methods with the dedicated tool of Aspen-HYSYS.
2b- Are we using the indirect or direct split configuration?
3- For the first column, study the effect of changing the feed tray location on the utility duty of the reboiler and condenser. What do you conclude?
4- Separate this same feed (i.e., BTX mixture) using only one column but with a liquid side stream. You should get three product stream (one rich in X, the other rich in T and the last rich in B).
Can someone show me how to do it using hysys?
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Determine the transfer function H(s)/Q(s) for the liquid-level
system shown in Fig. Resistances R1
and R2 are linear. The flow rate from tank 3 is maintained constant
at b by means of a pump; i.e.,
the flow rate from tank 3 is independent of head h. The tanks are
noninteracting
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What does natural gas processing include (at the field level)?
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What is the general approach used in Nylon polymerization to get high molecular weights?
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Styrene is almost a unique monomer, in that it can be polymerized by practically all methods of chain polymerization.
A. Free radical
B. Anionic
C. Cationic
D. Co-ordination (i.e., with a catalyst)
Which of these methods would you use to make isotactic polystyrene? why?
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Waste management: What are the main forms of waste produced in the petrochemical industry and how are these maanged using recycling, reusing, incineration, landfills, and composting?
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