Question

In: Mechanical Engineering

The particulars of a 20 TR R 22 food freezer are as follows: Evaporator temperature –...

The particulars of a 20 TR R 22 food freezer are as follows:

Evaporator temperature – 30°C

Condenser temperature 40°C

Temperature of vapor leaving evaporator – 25°C

Subcooling of liquid with vapor in heat exchanger 5°C

Polytropic index of compressor 1.15

Superheating of suction vapor after passing through suction valve 15°C

Compressor clearance factor 0.05

Pressure drop in valves 0.2 bar suction

0.5 bar discharge

The compressor has 6 cylinders with bore equal to stroke. Its rpm is 1500, and mechanical efficiency is 0.75. Determine

(i) Mass flow rate of refrigerant.

(ii) Piston displacement of compressor.

(iii) Cylinder diameter.

(iv) Motor horse power.

(v) Cooling requirement of compressor in kW.

Solutions

Expert Solution

The solution of the given problem is shown in below:-

​​​​​​


Related Solutions

1. A government incurred expenditures for its infrastructure as follows: $20 million for general repairs; $22...
1. A government incurred expenditures for its infrastructure as follows: $20 million for general repairs; $22 million to extend the life of existing infrastructure; $21 million for improvements and additions. If depreciation is to be charged, the amount would be $23 million. Which of the following would be true? A) If the government chose to use the modified approach to record infrastructure, the amount to be charged as expense would be $42 million. B) If the government chose not to...
Find the temperature distribution T(r,θ,z) inside a cylinder of height z= 20 and radius r= 8...
Find the temperature distribution T(r,θ,z) inside a cylinder of height z= 20 and radius r= 8 , if the cylinder temperature is zero in all surface except the bottom circular surface where it is divided two halves , the first is held at T1= 100 c and the other is held at T2=200 c. please use laplace equation and show me the solution with the details of the derivation .
The vapor pressure of nitric acid varies with temperature as follows. T/oC 0 20 40 50...
The vapor pressure of nitric acid varies with temperature as follows. T/oC 0 20 40 50 70 80 90 100 P/torr 14.4 47.9 133 208 467 670 937 1282 What is the normal boiling point and the enthalpy of vaporization?
A 100 kW, 8-cylinder R-22 compressor with 20 kW power operates at zero & 40 C...
A 100 kW, 8-cylinder R-22 compressor with 20 kW power operates at zero & 40 C evaporating & condensing temps. The compressor bore 0.07 m & stroke 0.06 m with clearance volume of 5% runs at 30 rev/sec. Determine: a. Draw the PH diagram indicating all enthalpy & sp. vol. b. Volumetric efficiency c. Suction volume, m3/s d. Piston displacement, m3/s e. Actual volumetric efficiency f. Actual work of compressor, kJ/kg g. Isentropic work of compression, kJ/kg h. Compression or...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT