A double-pipe heat exchanger is used to condense steam at 40°C saturation temperature. Water at an average bulk temperature of 20°C flows at 2 m/s through the inner tube (copper, 2.54 cm ID, 3.05 cm OD). Steam at its saturation temperature flows in the annulus formed between the outer surface of the inner tube and outer tube of 6 cm ID. The average heat transfer coefficient of the condensing steam is 6,000 W/m² ? K, and the thermal resistance of a surface scale on the outer surface of the copper pipe is 0.000176 m² ? K/W. a. Determine the overall heat transfer coefficient between the steam and the water based on the outer area of the copper tube. b. Evaluate the temperature at the inner surface of the tube. c. Estimate the length required to condense 0.5 kg/s of steam.

Explain a few aspects of how patents may be change, or their importance may change, due to the advent of 3d printing and related technologies.

Protolabs is one of the companies changing the economics of injection molding by 3d printing

molds. Why does this change the cost reckoning of injection molded parts?

The US Postal Service has recently commissioned a study of the effects of 3d printing on its business. Some were pessimistic, saying 3d printing would be bad for the postal service, while others were optimistic, saying that 3d printing would be a boom to the postal service. Why do you suppose informed people could hold such divergent views?

How might product liability law be disrupted by 3D printing?

Thermodynamics

ANSWER: 1,713.4

Determine the specific enthalpy of 1.5 kg of water contained in a volume of 0.73 m³ at 200 kPa.

What is the importance of S11 parameter in one-port antenna measurements?

Explain the motions of each mechanism in an excavator arm

Write minimum 20 comparsions between ELECTROMAGNETIC PUMP & ELECTROMAGNETIC REACTORS?

Design a vibration limiting machine which has input vibrations of sinosidal force of ACos? Where A=10⁶N. The machine has a mass of 60kg and frequency of the input force is 10rpm. We have to limitize the vibrations of machine to 2cm.

You have to select the elements of machine values as per arrangement?

Design & calculate the values as per required values given? And label each & every part

Name two sources of renewable energy that you know and one way of harvesting and storing energy from one of them. Make a sketch of the process and label the components that will be involved

There have a thin and symmetry wing. aspect ratio is 10, span is 5m, taper ratio is 0.8 and δ＝τ＝0.055. wing's speed is 180km/h and lift is 1.000N. Determine this wing's angle of attack(air density is 1.23Kg/m³)

write 200 words (screw drivers )

To select materials based on properties, manufacturing, sustainability, available time, cost and performance.

Keywords:       properties, processing, performance, sustainability

Prerequisite Knowledge:          basic knowledge of general materials’ properties.

These factors can be broken down into the following areas.

Material Properties

The expected level of performance from the material

             Material Cost and Availability ?

             Processing - must consider how to make the part

Environment – the effect that the service environment has on the part The effect the part has on the environment. The effect that manufacturing/processing has on the environment.

Time available to make the component

A well-insulated rigid tank contains 3kg of saturated liquid vapour-mixture of water at 250kpa. Initially, three quarters of the mass is in the liquid phase. An electric resistance heater placed in the tank is turned on and kept on until all the liquid in the tank is vaporizer. Assuming the surroundings to be 25 degrees Celsius and 100kpa

Determine:
a) The exergy destruction and
b) The second law efficiency for the process.

A beam is subjected to equal bending moments M = 6.5 kip-ft, as shown. The cross-section of the beam is also shown. The top rectangular area (1) has cross-section dimensions b1 x d1, as shown, where b1 = 6.5 in. and d1 =1.50 in. The left and right rectangular legs (2) and (3) are of dimensions b2 x d2 as shown, where b2=0.75 in. and d2=6.0 in. Determine: (a) the centroid location, the moment of inertia about the z axis, and the controlling section modulus about the z axis. (b) the bending stress at point H, which is located yH = 1.0 in. below the z centroidal axis. State whether the normal stress at H is tension or compression. (c) the maximum bending stress produced in the cross section. State whether the stress is tension or compression. Calculate the cross-sectional areas A1, A2, and A3 for areas (1), (2), and (3), respectively. Answers: A1 = in.2. A2 = in.2. A3 = in.2.

Part 2 Determine the location of the y direction centroids of areas (1), (2), and (3) with respect to the reference axis at the bottom of the cross-section.

Part 3 Determine the centroid location in the y direction for the beam cross-section with respect to the reference axis at the bottom of the cross-section.

Part 4 Determine the moment of inertia Ic1 for area (1) about its own centroid, y1.

Part 5 Determine the moment of inertia Iz1 for area (1) about the z centroidal axis of the cross-section.

Part 6 Determine the moment of inertia Ic2 for area (2) about its own centroid, y2.

Part 7 Determine the moment of inertia Iz2 for area (2) about the z centroidal axis of the cross-section.

Part 8 Determine the moment of inertia Ic3 for area (3) about its own centroid, y3.

Part 9 Determine the moment of inertia Iz3 for area (3) about the z centroidal axis of the cross-section.

Part 10 Determine the moment of inertia Iz for the cross-section about the neutral axis.

Part 11 Determine the section moduli Stop and Sbot of the cross-section. Note which one is the controlling section modulus.

Part 12 Determine the bending stress at point H (positive if tensile, negative if compressive).

Part 13 Determine the maximum bending stress produced in the cross section. Make a note on paper of whether the stress is tension or compression. Note that the maximum bending stress is the bending stress with the largest absolute value. However, report the answer here using the correct sign according to the flexure formula.