Reference no: EM13683101
John is concerned that the compressor appears to be much too hot to touch, a sign perhaps that the compressor requires maintenance. John knows that the compressor consumes 26 Btu/lbm of throughput and that less than 2% of the electricity that the compressor draws must be lost to heat. Here are the data that John also has at hand:
Working Fluid = Freon 134a, Pi = 60 psia, Pe = 160 psia, Ti =70oF, Te =160oF Volumetric flow rate in = 140 ft^3 /min
1. What is the rate of heat loss in Btu/min?
2. What is the change in enthalpy of the working fluid as it passes during the compressor in Btu/lbm.
3. Please perform a First Law Reduction with the compressor as the system.
4. At $0.10/kW-hr what is the total cost of heat loss in $/year?
5. What is the rate of heat loss as a percentage of the electrical energy draw?
6. Must John recommend maintenance on the compressor? Please defend your answer
|
What is the magnitude of the resultant force acting on mass
: A 4.0-kg mass on the end of a string rotates in a circular motion on a horizontal frictionless table. The mass has a constant speed of 2.0 m/s and the radius of the circle is 0.80 m. What is the magnitude of the resultant force acting on the mass?
|
|
Net electric field at origin due to these two point charges
: A point charge q1 = -4.00 nC is at the point x = 0.60 m, y = 0.80 m, and a second point charge q2 = +6.00 nC is at the point x = 0.60 m, y = 0. Compute the magnitude of the net electric field at the origin due to these two point charges.
|
|
Ratio of charge to mass for the electron
: Presume an apparatus (vacuum tube) is turned on to a constant voltage of 200V. A beam will now be observed on the glass envelope opposite the anode. Adjusting the current, I through the coil would show how the beams curves up into the sphere of the t..
|
|
Three point charges are arranged on a line
: Three point charges are arranged on a line. Charge q3 = +5.00nC and is at the origin. Charge q2 = -3.50nC and is at x = 3.50cm. Charge q1 is at x = 2.50cm. What is q1 (magnitude and sign) if the net force on q3 is zero?
|
|
Must john recommend maintenance on the compressor
: John is concerned that the compressor appears to be much too hot to touch, a sign perhaps that the compressor requires maintenance. John knows that the compressor consumes 26 Btu/lbm of throughput and that less than 2% of the electricity that the com..
|
|
How far has the elevator moved
: A 50 kg student obtains in a 1000 kg elevator at rest. As the elevator begins to move, she has an apparent weight of 600 N for the first 3 s. How far has the elevator moved, and in which direction, at the end of 3 s?
|
|
What is the back order at the end of the second month
: If the company uses a level-production, level-employment SOP plan with a target ending inventory at the end of these four months being 30 pounds.
|
|
Decide the magnitude of force of friction acting on block
: A 1.0-kg block is pushed up a rough 22o inclined plane with a force of 7.0 N acting parallel to the incline. The acceleration of the block is 1.4 m/s2 up the incline. Decide the magnitude of the force of friction acting on the block.
|
|
What is the safes acceleration up the ramp
: Burglars are trying to push a 1000 kg safe up a 20o frictionless ramp with a horizontal force of 4000N. What is Burglars are trying to push a 1000 kg safe up a 20o frictionless ramp with a horizontal force of 4000N. What is the safe's acceleration up..
|