Determine the coefficient of performance of the machine

Assignment Help Mechanical Engineering

Reference no: EM13704655

An air-conditioner using R-134a as the working as the working fluid maintains a space at a constant temperature of 23 degrees celsius while rejecting heat to the outside at 37 degrees celsius. The rate of heat gain in the space is 5.0kW. The refrigerant enters the compressor as a saturated vapour at 400kPa and at a rate of 20l/min and leaves at 1.2MPa and 70 degrees celsius. The compressor loses heat to the surroundings at the rate of 100W. The temperature surrounding the compressor is Tb = 27 degrees celsius.

a) Determine the Coefficient of Performance (COP) of the machine.

b) Determine theoretical maximum COP of the machine.

c) Calculate the rate of entropy generation.

Reference no: EM13704655

Questions Cloud

Piston-cylinder device : The refrigerant R-410a is contained in a piston-cylinder device, as shown in the figure, where the volume is 13 L when the piston hits the stops. The initial state of the fluid is -30 Â°C, 150 kPa, with a volume of 10 L. The entire system is brought ..

Dealing with recruitment and selection process : Both public and private institutions have to deal with internal and external factors when they are dealing with recruitment and selection process.

Titanium is stiffer than aluminum : Titanium is stiffer than aluminum, has a lower thermal expansion coefficient than aluminum, and has a higher melting temperature than aluminum. On the same graph, carefully and schematically draw potential well curves for both metals. Be explicit in ..

Required for the compression and the final pressure of gas : A gas is contained in a piston of 5 m^3 at 100 KPa. Then the gas is compressed till its volume is reduced to 2.5 m^3. If there was no exchange of heat from the system during the compression process, calculate the work required for the compression and..

Determine the coefficient of performance of the machine : An air-conditioner using R-134a as the working as the working fluid maintains a space at a constant temperature of 23 degrees celsius while rejecting heat to the outside at 37 degrees celsius. The rate of heat gain in the space is 5.0kW.

Calculate the sensible heat load due to the infiltating air : Outdoor air leaks into a building through cracks in the walls at the rate of 700 m3/h (this is infiltratation). The outside air is at a temperature of -16.1C and a humidity ratio of 0.001 kgv/kga. The density of the outside air is1.4 kg/m3. The indoo..

Mass fractions of the contents are in the liquid phase : The professor takes a 3 liter empty can and fills it with saturated water vapor at 100 deg. C, 1 atm. He seals the can and immerses it in ice water. If the can is perfectly rigid, what is the final pressure in the can? And what mass fractions of the ..

How experience helped sharpen your communication skills : Describe a time when you had to learn about a new culture or way of life - explain how the experience helped sharpen your communication skills. Explain how you were enriched by the experience.

Low pass butter worth filter has a corner frequency : A low pass butter worth filter has a corner frequency of 1 khz and a roll-off of 24 db per octave in the stop band. If the output amplitude of a 3 khz sine wave is .1 V, what will be the output amplitude of a 20 khz sine wave if the input amplitudes ..

User Account

All Pages