10.8D According to researchers, advances in nanomaterial
fabrication are leading to development of tiny thermoelectric
modules that could be used in various applications, including
integrating nanoscale cooling devices within the uniforms of
firefighters, emergency workers, and military personnel;
embedding thermoelectric modules in facades of a building;
and using thermoelectric modules to recover waste heat in
automobiles. Research two applications for this technology
proposed within the past five years. Investigate the technical
readiness and economic feasibility for each concept. Report your findings in an executive summary.

Superheated steam at 8 MPa and 480°C leaves the steam generator of a vapor power plant. Heat transfer and frictional effects in the line connecting the steam generator and the turbine reduce the pressure and temperature at the turbine inlet to 7.3 MPa and 440°C, respectively. The pressure at the exit of the turbine is 10 kPa, and the turbine operates adiabatically. Liquid leaves the condenser at 8 kPa, 36°C. The pressure is increased to 8.6 MPa across the pump. The turbine and pump isentropic efficiencies are 88%. The mass flow rate of steam is 79.53 kg/s. Determine (a) the net power output, in kW. (b) the thermal efficiency. (c) the rate of heat transfer from the line connecting the steam generator and the turbine, in kW. (d) the mass flow rate of condenser cooling water, in kg/s, if the cooling water enters at 15°C and exits at 35°C with negligible pressure change.

Estimate the value of the acentric factor, w , for nitrogen, using tabular vapor pressure and critical data. The vapor pressures of nitrogen at 85 and 90 K, respectively, are 2.291 and 3.608 bars. (Note: Do not linearly interpolate the vapor-pressure data, but assume that the vapor pressure P_vis related to the absolute temperature by the relation, ln P_v= A/T + B .)

If four nuclei of ₁H¹ were to fuse to produce a nucleus of ₂He⁴, what is the mass defect and the corresponding energy released? What is the energy in kJ that would be released from the fusion of 1 kg of hydrogen?

a) A machined steel has the following properties: Sut= 400 MPa, Sy= 350 MPa, and S’e= 200 MPa. The value f = 0.9 Sketch the S-N diagram for this material, label the key points on the graph and compute the material strength (Sf) corresponding to 800,000 loading cycles?

b) What value of strength of the materials described above should be used if 3,000,000 loading cycles are expected during the life of this part?

From a surface measurement made by surface profilometer, the following point values were obtained. (The scale factor is 0.6 micrometer). There are 10 points. 516,534,518,533,518,530,520,526,521 and 526.

Try to find Ra,Rq,Rt values and Ratio Ra/Rq.

Clearly identify and explain the reason behind the key processing limits relevant to the material extrusion process - FDM (Fuse deposition modelling) that are based on:

a. Limits of the material being processed

b. Limits of the equipment being used

Answer the 2 questions below in regards to the material extrusion process , FDM (Fuse deposition modelling).

a. Detailed Explanation of how and why the following 3 variables affect the SURFACE FINISH of the product

1. Pressure/Force 2. Temperature 3. Time   

b. Detailed Explanation of how and why the following 3 variables affect the DIMENSIONAL ACCURACY of the product

1. Pressure/Force 2. Temperature 3. Time   

**you will likely need to consult online or literature sources to be able to explain the mechanisms that cause these accurately);

Air as an ideal gas enters a diffuser operating at steady state at 5 bar, 340 K with a velocity of 512 m/s. The exit velocity is 110 m/s.

For adiabatic operation with no internal irreversibilities, determine the exit temperature, in K, and the exit pressure, in bar:

(a) for k = 1.4.

(b) using data from Table A-22.

Problem 8-49 from the textbook, Mechanics of Materials by R.C. Hibbler. It is the 10th addition.  

Nitrogen (N₂) at 1 bar, 300 K enters a compressor operating at steady state and is compressed adiabatically to an exit state of 16 bar, 750 K. The N₂ is modeled as an ideal gas and kinetic and potential energy effects are negligible. Determine the work input, in kJ per kg of N₂ flowing, the rate of entropy production, in kJ/K per kg of N₂ flowing, and the isentropic compressor efficiency.

What are the 5 different type of sensory warnings for product safety?

Describe the physical structure of bonded abrasives.

identifying what is grit number, bond strength, and porosity.

Water vapor at 5 MPa, 320°C enters a turbine operating at steady state and expands to 0.1 bar. The mass flow rate is 2.52 kg/s, and the isentropic turbine efficiency is 92%. Stray heat transfer and kinetic and potential energy effects are negligible.

Determine the power developed by the turbine, in kW.

Rank the following from most isotropic to least isotropic.

Unidirectional Long Fiber

Random short

Fiber Randon long fiber (not woven)

Oriented short Fiber