A circumferential fin (k= 55 W/m C) of thickness 3 mm and length 3 cm is attached to a pipe of diameter 3 cm. The fin is exposed to a convection environment at 23 C with h=25 W/m2 oC. The fin base temperature is 223 C. Calculate the heat lost (qf) by the fin.

Explain why burnable poisons are used in the reactor at the beginning of life. Include the boron letdown curve and a discussion of under versus over moderated in your discussion.

liquid oil is used in the tube side of a shell-and-tube heat exchanger with two shell passes and four tube passes. water is heated in the shell side from 10°C to 50°C while the oil is cooled from 90°C to 60°C. the overall heat transfer coefficient is 53 W/m^2*K. the specific heat of the oil is 2.0 kJ/kg*K. Using the NTU - effectiveness method, calculate the area of the heat exchanger for a total energy transfer of 500 kW. what is the water flow rate for this heat transfer?

The Business Club at Elk College

Our VP of Marketing just learned the Business Club at Elk College (BCEB) is hosting the State Conference of Business Clubs on April 9 – 11, 2018 at the Central Downtown Campus in Dallas, Texas. Jack Morton director of the club has requested an Information System to register, monitor and house participants for the conference. BCEB has requested through the Director of Computer Systems Support that (You), one of our Marketing officers, investigate and recommend an Information Systems for these tasks.

Background Information

The BCEB is the local chapter affiliated with the state organization which will Conduct and coordinate the conference. The primary need will be to register the estimated 250 students from 14 schools which are part of this Business Clubs organization. The students will be participating in one of four areas; interviewing skills, business presentations, financial planning or research, and development. Some of the schools have requested the registration can be handled online to eliminate tracking forms. Each school will have a faculty representative who will be responsible for their students.

The Old Downtown Inn will be the base hotel for the faculty and students while in Dallas. Manager, Jill Thomas, has worked with the school previously on other conferences. Jill calls and sends emails that she prefers handling the room reservations in a paperless manner.

As host of the conference, Jack Morton will need to be able to locate any student or faculty representatives at any time while in session between 8am and 6pm, during all 3 days. The registration system will also be used to schedule students into their events and also any special trips during the conference.

Your proposal (Student Summary Report) should contain your analysis information and details of a typical preliminary investigation, including your SWOT analysis, Internal / External analysis, data, charts, recommendations, and thoughts on the following:

1) What type of hardware and software platform would be needed to support this computer based system.

2) Based on the scope described in this Case studies background information, will this development need any outside contractors or help desk support?

3) Consider the use of online systems for the project.

4) What is the feasibility of completing and testing the system in the time frame between now (our case study timeline date) and April 2, one week prior to the conference?

5) For your proposal use the System Requirements Document section format and other document templates provided within your on-line course resources

The gas-phase, elementary reaction: 2A + 1/2B ----> C + 2D will be conducted in a constant volume, isothermal batch reactor. The reactor is initially charged with a stoichiometric ratio of A and B. The reaction is moderately exothermic and the heat of reaction will be removed via cooling water. The following data is available:

Initial Conditions: Initial concentration of A = Cao, initial concentration of B = Cbo

Cooling water: inlet temperature = Ta1, outlet temperature = Ta2, water heat capacity = Cp, water flow rate = m

Reactor conditions: reactor volume = V, heat transfer coefficient = U, heat transfer area = A, reactor pressure = Po=P

Material Properties: Heat capacities: Cpa, Cpb, Cpc, Cpd, heat of reaction = deltaHr, molecular weight of reactants and products = MWa, MWb, MWc, MWd, rate constant=k

a) plot the expected flow rate of coolant required to maintain isothermal conditions versus the reaction conversion.

b) Dvelop the expression that will allow the determination of the required flow rate of cooling water versus the reaction conversion.

A process for making small amounts of hydrogen by cracking ammonia is being considered, and residual uncracked ammonia is to be r removed from the resulting gas. Design a tray type absorption column to remove NH₃ from a gas stream using water as solvent. The gas stream (flow rate = 0.7 kg/s) consists of H₂ and N₂ (in the molar ratio 3: 1) and 3% NH₃ by volume. The ammonia will be removed by scrubbing the gas countercurrently with pure liquid water (flow rate = 6 kg/s) in a sieve-tray tower. The exiting gas stream should have 1% NH₃. Assume that only NH₃ can dissolve in water, and other gases (N₂+H₂) are inerts. Conditions at bottom of tower: Temperature, T = 303 K, and Pressure = 200 kPa.

Determine:

The number of stages (trays), tray spacing, and the diameter of the absorption column

Find the adiabatic flame temperature for complete combustion with 130% theoretical air for pentane. (The pentane and air enter at standard reference conditions.)

For a kerosene drop with an initial diameter of 1 mm in air at 700°C and 1 atm absolute pressure, (a) find the time to vaporize 50%, 90% and 100% of initial mass of the droplet, and (b) what is the mass flow rate from the droplet when the droplet is 50% and 90% vaporized?

A 1.000-L vessel contains a mixture of hydrogen, carbon monoxide and methane gases in unknown proportions at 20.9-bar and 25 °C. The gaseous mixture is found to have a mass of 13.10-g and a higher heating value of 414.10 kJ/mol. What is the composition of the gas?

y_H2=   

y_CO=

y_CH4= .2

In this experiment, we will explore fermentation. As you read Chapter 13, one of the fates of pyruvic acid can be the production of carbon dioxide and ethanol. The pyruvic acid is made from carbohydrate by glycolysis. By measuring the amount of CO2 made over time, you can measure the efficiency of glycolysis. The basic experiment is relatively simple. 1. Prepare a sample of carbohydrate in water. Take note of the concentration in % (use volume or weight). 2. Completely fill a small juice glass with the carbohydrate mixture. 3. Add yeast to the mixture. Start with 1.4 tsp. 4. Mix the carbohydrate, water, yeast mixture. If you spill some make sure the juice glass is filled to the brim. 5. Place a flat-bottom bowl over the juice glass. 6. Invert both the bowl and juice glass together, being careful not to spill the contents. Now the glass is upside down in the bowl. 7. Watch the glass for at least 2 hours, recording the size of the bubble formed every 15 minutes. The size of the bubble can be estimated by measuring the height of the bubble in cm. Multiply the height by (1/4)x(diameter in cm)x(diameter in cm) x pi. Pi is approximate 3.14. (V= h x pi x r^2). Run this experiment 4 times (Since there is a lot of waiting, you can start a second experiment after you get the first started). One experiment should be a control, using no carbohydrate. Vary only one variable. For example, one student might test sucrose (table sugar), Karo syrup, and honey. Another student might vary the concentration of carbohydrate; 5%, 10%, 15%. Another student might vary the temperature: in an ice bath, room temp, in a 100 degree F oven. This is a case where I would like to see you design your own experiment. Make a lab report of your own design. It should have the following components:

1. Introduction and Objectives.

2. Procedure (What did you do?).

3. Results in tabular form.

4. Conclusion ( What do your results mean in terms of what you have learned about enzyme kinetics, glycolysis, and carbohydrate metabolism?)

The transportation sector in the United States presently runs almost exclusively on petroleum-based derivatives (gasoline, diesel, fuel). Research the following alternatives.

Hybrid

Diesel & biodiesel

Flex-fuel Ethanol

Natural gas

Propane

Hydrogen

Electric

Fuel cell

Prepare a one-page paper outlining what you believe may be viable alternatives to the use of fossil fuels. May be assigned as a team or an individual assignment.

different types of gas absorption columns- explain briefly

A stream of 70kg/hr superheated steam is used to heat 15kmol/hr nitrogen gas via a heat exchanger. The superheated steam at 350⁰C and 1 bar enters the heat exchanger and exits as saturated water liquid at the same pressure.The nitrogen gas is heated from 25^oC to 300^oC at constant pressure of 1atm.The heat exchanger is set up for countercurrent flow.

i)Draw and label the flowchart of the heat exchanger process by indicating all the input and output process variables.

ii)Determine the heat loss from the heat exchanger.

iii)If the saturated water liquid flows in a pipe with inner diameter of 2cm,estimate the rate of kinetic energy of the saturated water liquid.

iv)Propose one method to reduce heat loss.

Procedure :

Note : During the lab, look for a qualitative observation that proves CO2(g) is denser than air.

(1)Weigh the empty 400mL Erlenmeyer flask with a rubber stopper on.

(2)Obtain few small pieces of CO2(s) in the flask. The total amount should be close to the given rubber stopper in size. Let it sublime. Make sure the pieces are small enough so you can see them ‘sing’ and ‘dance’.

* Should you have your rubber stopper on or off during the sublimation? Why?

(3) When sublimation is done, cap it with the stopper and weigh it. We are assuming that the container is completely filled with CO2 at this point.

* How can you be sure that there is no air left in the flask?

            * What does this mass contain?

Can one get the repassivation potential of a stainless steel in a saline solution using the linear polarisation method (LPR)?

Explain your answer in 1-2 sentences.