Steam in a heating system flows through tube whose outer diameter is 10 cm and whose walls are
maintained at a temperature of 150°C. Circular aluminum alloy 2024-T6 fins (k = 186 W/m · °C)
of outer diameter 15 cm and constant thickness 2 mm are attached to the tube. Heat is transferred
to the surrounding air at T∞ = 25°C, with a heat transfer coefficient of 50 W/m2 C . If the total

tube length is 5 m and spacing between fins is 6 mm then determine:
a. The total number of fins to be installed on tube
b. The increase in heat transfer rate as a result of adding fins
c. Overall effectiveness of the fined surface

Write a FORTRAN 77 SOFTWARE code script for transcritical R407C air source water heat pump using R134a plus R407c refrigerant for space application.....please
don't write code in other program....
it's mechanical engineering question

Consider a circular air duct (no insulation) with a constant diameter of 10 cm and length of 1 m. The inlet condition is 40 deg C and 20 m/s. The wall of the duct is at a constant temperature of 25 deg C.

a) Find the exit temperature of the air flow. Report answer in deg C with 3 significant figures.

b) Find the rate of heat lost from the air flow. Report answer in kW with 3 significant figures.

The mass balance for a control volume can be defined as any change of mass within the control volume is equal to the net gain of mass flowing into the volume through the control surface. Based on this definition, derive the equation of mass balance for 3 dimensional, steady and incompressible fluid flow.?

Identify the correct statement in the context of forced convection. (Check all that apply.)

A) Natural convection enhances forced convection heat transfer in transverse flow.

B) Natural convection hurts forced convection heat transfer in transverse flow.

C) Natural convection enhances forced convection heat transfer in opposing flow.

D) Natural convection hurts forced convection heat transfer in opposing flow.

A thin-walled cylinder gets 200 kN axial compressive force and 3 kNm torque moment simultaneously. The diameter of the cylinder is 300 mm and the cylinder wall thickness is 3 mm. Determine the main stress that occurs in the cylinder wall element and the maximum shear stress. Ignore the possibility of buckling in the cylinder

Describe the use of Destructive and Non-Destructive Analyses and Containment and Surveillance in the context of safeguards. Compare the different approaches and describe the benefits and shortcomings of each.

Q7 : A cascade refrigeration system is designed to supply 10 tonnes of refrigeration at an evaporator temperature of -40°C and a condenser temperature of 36°C. The load at -40°C is absorbed by a unit using R-22 as the refrigerant and is rejected to a cascade condenser at -10°C. The cascade condenser is cooled by a unit using R-12 as the refrigerant and operating between - 20°C evaporating temperature and 36°C condenser temperature. The refrigerant leaving the R-22 condenser is subcooled by 6°C but there is no subcooling of R-12 refrigerant. The gas leaving both the evaporators is dry and saturated and the compressions are isentropic. Neglecting losses. calculate the COP of whole system

Consider a centrifugal water pump whose geometry and flow conditions are as follows: Impeller outlet radius – 2.5 cm, impeller inlet radius – 1.8 cm, impeller outlet width – 1 cm, design speed – 1800 rpm, Design flow rate120 liters/min, Backward-curved vanes (outlet blade angles) – 60 deg. Assuming 100% efficiency, find: a) the total head, b) absolute and relative discharge velocities, c) theoretical power required at design flow rate and d) the theoretical pump curve

A gas refrigeration cycle with a pressure ratio of 4.3 uses helium as the working fluid. The temperature of the helium is 26°C at the compressor inlet and 50°C at the turbine inlet. Assuming isentropic efficiencies of 87 percent for both the turbine and the compressor, determine (a) the minimum temperature in the cycle, (b) the coefficient of performance, and (c) the mass flow rate of the helium for a refrigeration rate of 20 kW.

ans a)198.76 b)0.574 c)0.0564.

Can you show me the solution step by step please?

A piston-cylinder device, whose piston is resting on a set of stops, initially contains 2 kg of air at 300 kPa and 27ºC. The mass of the piston is such that a pressure of 600 kPa is required to move it upward. Heat is now transferred to the air until its volume doubles.

a) Determine the work done by the air and b) the total heat transferred to the air during this process. c) Also, sketch the process on a P-v diagram

Your objective for this project is to do an Internet-based literature search and describe in detail, the methods/processes used by GE to design and develop green products, sustainable production processes, and implement its eco-friendly supply chain.

In 1500 -2500 words, your report should address the following topics:

1. Introduction to ecological sustainability
2. Corporate Social Responsibility (CSR) and sustainability objectives of GE
3. Green Product Design at GE

3a.            Describe the general guidelines for designing an environmentally friendly product;

3b.            Product design system/methodology used at GE;

3c.             provide some examples of GE’s successful green product designs.

4. Eco-friendly production/manufacturing processes used at GE

4a.             Describe the guidelines used by GE to make their operations/production processes eco-friendly;

4b.            Give examples of some of the successful green manufacturing processes used at GE.

5. Green Supply Chain Management at GE related to

5a.              Suppliers

5b.             Transportation & Distribution  

6. Conclusion

6a.              Discuss how successful GE has been in achieving its environmental sustainability goals. Provide some supporting statistics.

6b.             Describe some of the challenges GE is facing in implementing its sustainability programs in some of the developing countries.

This is a team/group project. The group size is limited to a maximum of three (3) students. Your report should be 1500 – 2500 words (excluding quoted and bibliographic material) long, typewritten, and professional looking. It should be in the APA format and should be written by you in your own words. The “Turnitin” Similarity Index (SI) of your report should be less than 15%.

Q1: What are the criteria by which machinability is commonly assessed in a production machining operation? Explain the difference between roughing and finishing operations in machining. What is the difference between peripheral milling and face milling? What is the difference between internal broaching and external broaching?

Note: Please write in your own words don't copy and paste.

A venturimeter is placed in a pipe which is at 30 degrees to the horizontal. The pipe carries gasoline of specific gravity 0.8. The diameter at inlet and throat diameter are 5cm and 3cm respectively. A mercury manometer reads a level difference of 10cm.Calculate the flow rate.