Sign up now
to enroll in courses, follow best educators, interact with the community and track your progress.
Detailed Outline on the Volumetric Efficiency of a Reciprocating Compressor
1,718 plays

This lesson throws light on the concepts related to the volumetric efficiency of a reciprocating compressor. One will come across the definition, important derivations related to volumetric efficiency of a reciprocating compressor and numericals on the reciprocating​ compressor

Harshit Aggarwal
Cleared UPSC ESE twice with Rank 63 and 90 in mechanical engg. Got 99 percentile in GATE. Cracked ONGC, BHEL,ISRO, SAIL, GAIL successfully

Unacademy user
good but very few forms. need to explain more
sir keep the vapour absoprtion cycle
Harshit Aggarwal
3 years ago
Please suggest me for IES
Vishal Kukka
a year ago
what should i suggest you about a coaching means unacademy videos far most better than coaching i can suggest you coaching centre also MADE EASY DELHI sorry for the late reply @diwakar
why we take complete length of cylinder in swept volume ...there is some clearance b/w piston and cylinder head
Amit Phoenix
3 years ago
L is not the length of the whole cylinder. L is the stroke length, which makes it swept volume and not the whole volume of the cylinder.
Harshit Aggarwal
3 years ago
We have not considered the clearance volume. L is the stroke length that is why it is stroke volume.
if the mass flow rate of the regrigerant is decreasing from chiller what will the effect on the different parameters of chiller?
Harshit Aggarwal
3 years ago
I will make lesson on that

  2. ABOUT ME Graduated from NIT Nagpur in 2008 . Cleared Indian Engineering Services (IES-UPSC) Exam . Got the offer letter from most of the Maharatna and Navratna Companies Cleared GATE Exanmm Course fee: CONTRIBUTE . Follow me on Unacademy at:

  3. VOLUMETRIC EFFICIENCY OF A RECIPROCATING COMPRESSOR COMPRESSION CYCLE: Entering +Compression + Leaving (1 cycle--> 1 revolution) .It is defined as the ratio of the swept volume. . If m is actual mass flow rate of refrigerant and vi is specific volume of the refrigerant at the inlet of compressor, then actual volume of refrigerant entering the compressor = my, kg/sec x m3/kg = m3/sec actual vo wept

  4. . We know that swept volume, D2L / cycle but every cycle is completed in 1 revolution therefore Napm Ncycle/min N. XN cycle- D2LN ; D= Diameter of cylinder, L= stroke min length . If there are k number of cylinders or compressor, total swept volume= D2LNk .n.ol =TD2LNk mv. (D = Bore diameter/ Piston diameter)

  5. Volumetric of a reciprocating compressor is also given by ,-I + C-C ( 2) 1/n , P, = Pressure at compressor inlet, P2-pressure at compressor outlet, n = index of expansion -mvo Clewenceo olume= Clearance Volumev . Clearance Ratio or Clearance Factor, C = Swept Volume

  6. NUMERICAL . In a simple VC Cycle, following are the properties of refrigerant at various point compressor inlet h 183.2 kJ/kg, vi 0.0767 m3/kg, compressor discharge h- 222.6 kl/kg, v,-0.06 14 m3/kg, condenser exit h3_h,-84.9 kJ/kg, v,-0.00083 m3/kg. The piston displacement volume is 1.5L and its volumetric is 80%. Speed N = 1600rpm. Find 1) Power input to compressor in kW 2) RE in kW. Sol: P=m(h2-hi) 0.8 =-m2:0.0767 m3 m = 0.417 kg/sec P = 0.417 (222.6-183.2) P = 16.43 kw RE = 0.417 (1832-849) RE = 40.9 kw . 1.5 x 10-3x160 sec 60 V, = 1.5 Litre = 1.5 x 10-3 m3 mv 4