Vapour Compression Cycle: Types and Numerical Analysis

Dive deep into the principles and applications of the vapor compression cycle with this detailed presentation. Explore various types of vapor compression cycles, understand their operational intricacies, and grasp the underlying numerical concepts through illustrative examples. An essential resource for students, engineers, and professionals in thermal and refrigeration sciences."

1. Prof.R.S.KOLHE Prof . R.S. KOLHE ME (HEAT POWER) BE (MECHANICAL) WELCOME TO Heating, Ventilation, Air Conditioning and Refrigeration Engineering

2. Lecture No 01 Topics to be covered Basics of HVAC Vapour compression cycle (VCR) Performance of VCR Representation of VCR on P-H and T-S plane

3. BASICS OF HVAC H- Heating V- Ventilation AC- Air-conditioning

4. HEATING : Designing the system for low temperature climate ( cold climate) VENTILATION: It is the fresh air penetrated form outside. It is a process of replacing air in conditioning space by fresh air having high indoor quality . REFRIGERATION : It is process of removing heat from body or space so that its temperature first reduce and then maintained at a temperature less than surrounding. AIR CONDITIONING : Air-conditioning is the process of treating air so as to control its temperature, humidity, cleanliness( air quality) and distribution to meet the requirements of the condition space.

5. Expectation From HVAC Cooling or Heating to control Temperature. Humidify or Dehumidify to control moisture content. Filter to remove contaminants Ventilate to supply fresh high quality air . Circulate to regulate air motion .

6. Vapour Compression Cycle Compressor Condenser Expansion device Evaporator

7. Standard Vapour Compression Refrigeration System (VCRS) Process 1-2: Isentropic compression of saturated vapour in compressor  Process 2-3 : Isobaric heat rejection in condenser Process 3-4: Isenthalpic expansion of saturated liquid in expansion device Process 4-1 : Isobaric heat extraction in the evaporator

8. Standard Vapour Compression Refrigeration System (VCRS)

9. Pressure – Enthalpy (P-H) Diagram

10. T-v diagram for the heating process of water at a) constant pressure and b) different pressure.

11. Pressure - Enthalpy Chart

12. Pressure – Enthalpy (P-H) Diagram

13. TEMP- ENTROPY (T-S) Diagram

14. PERFORMANCE OF VCC Refrigeration Effect= h1-h4 Refrigeration capacity = m(h1-h4) Compressor work= (h2-h1) COP = (RE/WC) COP =(h1-h4)/ (h2-h1)) Heat Rejected in condenser: h2-h3

15. The equipment efficiency is given as EER or kW/TR ENERGY EFFICIENCY RATIO (EER) The Energy Efficiency Ratio (EER) of an HVAC cooling device is the ratio of output cooling energy (BTU/h) to input electrical energy (in watts) at a given operating point. (EER) R = kW / TR Use for large capacity equipment such as Chillers H e a t ro m o v a l ra te in W a t t E n e rg y In p u t in W a t t R  k W / T R  = P o w er in p u t ( k W ) C ap acity ( T R )

16. Different cases of vcc case 1: Dry saturated vapour at Entry of the compressor

17. CASE 2: Refrigerant is Wet at Compressor Entry P-H Diagram T-S Diagram

18. Case 3: Sub cooling or undercooling

19. Case 4: superheated vapour before compression

20. Have a good day Thank you