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Understanding The Performance of Vapour Compression Cycle
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A very vital topic to learn, the performance of vapor compression cycle is discussed in this lesson. One will come across comprehensive information on the effect of variation of properties on the performance of VC cycle. The cases which he will discuss here are, the decrease in evaporator pressure, the increase in condenser pressure, superheating, and sub-cooling. Each case is explained either by using P-H or T-S diagrams. ​

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

U
Unacademy user
Sir please I'm new on unacademy can you please guide me
sir what about the other refrigeration cycles, mainly air refrigeration cycle?
EXPLAINED IN A VERY SIMPLE WAY.THANK YOU SIR
Sir VARS cycle is important or not.? You have discussed only the VCR part.
Harshit Aggarwal
4 years ago
I will be discussing VARS cycle in upcoming lessons
  1. Course : UNDERSTANDING THE BASICS OF REFRIGERATION Lesson 4 PERFORMANCE OF VAPOUR COMPRESSION CYCLE Presented By: Harshit Aggarwal


  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: https://unacademy.in/user/harshit_aggarwal


  3. EFFECT OF VARIATION OF PROPERTIES ON THE PERFORMANCE OF VC CYCLE


  4. CASE 1 :DECREASE IN EVAPORATOR PRESSURE (b Refrigeration effect i) Work inpur compressor work 2. 2 win i Volumetric v Volumctric ePieien efficiens Vol > P, Pvessine meho increase in vol 3iginal Cyel 2-3-4: New Cyele


  5. CASE 2: INCREASE IN CONDENSER PRESSURE --yr ) 72, 1-2-3-4; Original Cycle -2-3-4': New eyek ci, Refrigeration effec sor woTk) Win Civ, Volumetric due to in pressure ratio


  6. CASE 3: SUPERHEATING 3 2: EfFechs: Compressor work is Tsentropic Compression COPEN SYSTEM T-I


  7. SUPERHEATING.. Effects of Superheating: . 1 1. Increase in Refrigeration effect 2. Increase in work input due to increase in temperature at the inlet to the compressor 3. COP may increase or decrease depending on the refrigerant. In case of R-12 refrigerantsuperheating results in increase in COP whereas in the case of ammonia superheating results in decrease in COP.


  8. CASE 4: SUB-COOLING Effects of Sub-cooling: 1. Increase in Refrigeration Effect. 2. Work Input remains same. 3. Increase in COP. 3' 3 2