A refrigerator using R-12 as the working fluid keeps the refrigerated space at ?16? in an environment at 27?. You are asked to upgrade this refrigerator by replacing R-12 with the ozone-friendly R-134a. What changes in the pressure levels would you suggest in the new system? How do you think the COP of the new system will compare to the COP of the old system?
In: Mechanical Engineering
In: Mechanical Engineering
A refrigerator using R-12 as the working fluid keeps the refrigerated space at ?16? in an environment at 27?. You are asked to upgrade this refrigerator by replacing R-12 with the ozone-friendly R-134a. What changes in the pressure levels would you suggest in the new system? How do you think the COP of the new system will compare to the COP of the old system?
In: Mechanical Engineering
Write a Matlab script that computes the element level stiffness matrix and force vector for linear elasticity.
In: Mechanical Engineering
Explain the function of the following components with reference to sheet metal (progressive) dies.
a) Pilot, and b) Back Gage
In: Mechanical Engineering
In the boiler of a power plant are tubes through which water flows as it is brought from 0.8 MPa, 150°C to 240°C at essentially constant pressure. The total mass flow rate of the water is 100 kg/s. Combustion gases passing over the tubes cool from 1067 to 277 °C at essentially constant pressure. The combustion gases can be modeled as air as an ideal gas. There is no significant heat transfer from the boiler to its surroundings. Assuming steady state and neglecting kinetic and potential energy effects, determine
| (a) the mass flow rate of the combustion gases, in kg/s |
| (b) the rate of exergy destruction, in kJ/s. |
| (c) the exergetic efficiency given by Eq. 7.45. |
Let T0 = 25°C, p0 = 1
atm.
Round your answers to 3 significant digits.
In: Mechanical Engineering
General Motor Programs solve an issue/flaw of Motor Control Theory. Which one is it? Explain how/why they solve this issue?
In: Mechanical Engineering
In: Mechanical Engineering
If the values for reduced pressure and compressibility factor for ethylene are 2 and 0.6 respectively, compute the temperature.
In: Mechanical Engineering
How many sections do we usually divide the interval in when using Trapezoidal rule?
In: Mechanical Engineering
what can cause water pipes to vibrate and make noise
In: Mechanical Engineering
Precision Machining Technology (2nd Edition)
Chapter 8SU6, Problem 10RQ
Briefly explain the difference between rigid and nonrigid tapping.
Thanks!
In: Mechanical Engineering
what safety precautions should be taken when using a torch inside or near a building
In: Mechanical Engineering
Name and briefly describe at least two approaches to planarization. Indicate which is evolving as the preferred approach.
In: Mechanical Engineering
While looking at the results of an oil pressure test: Technician Asays that higher than normal readings can be caused by using oil that is too thin. Technician Bsays that higher than normal readings can be exppected on a cold engine. Who is correct? a. Tec A b. Tec B c. Both A and B d. Neither A nor B
In: Mechanical Engineering