1. STUDY ON HVAC SYSTEM STUDY ON HVAC SYSTEM www.engineersportal.in

2. HVAC Systems Types  Several types of configurations for space heating  HVAC systems are categorized by the method used to convey energy  All-air systems  Air-and-water systems  All-water systems www.engineersportal.in

3. HVAC Systems All-Air Systems  All heating, cooling, and humidification is supplied to a space by the air  Single-duct systems  Constant volume  Multi-zone, variable-air volume (VAV)  Multi-zone with re-heat  Dual-duct systems www.engineersportal.in

4. HVAC Systems All-Air Systems  Single duct systems Fossil-fuel furnace with direct-expansion (DX) cooling www.engineersportal.in

5. HVAC Systems All-Air Systems  Single duct systems Commercial system with central heating and cooling coils www.engineersportal.in

6. HVAC Systems All-Air Systems  Single duct systems Commercial roof-top units www.engineersportal.in

7. HVAC Systems All-Air Systems  Single duct systems Commercial system with central heating and cooling coils www.engineersportal.in

8. HVAC Systems All-Air Systems  Single duct systems Multi-zone commercial system with variable-air volume (VAV) fan www.engineersportal.in

9. HVAC Systems All-Air Systems  Geothermal Retrofit Suitability (Rafferty, 1998)  Low Temperature water (<150 o F)  Single-zone, multi-zone, dual duct8-10  Terminal reheat, VAV6-8  Standard Temperature water (180-200 o F)  Single-zone, multi-zone, dual duct7-8  Terminal reheat, VAV6-7  Steam  Single-zone, multi-zone, dual duct6  Terminal reheat, VAV4-5  Electric resistance furnace5-6  Air-air split heat pump3-4  Fossil-fuel furnace4-5  Packaged roof-top unit3-4  Fossil-fuel fired unit heaters3-4 www.engineersportal.in

10. HVAC Systems All-Water Systems  Hot and chilled water are distributed to terminal units and equipment  Free-standing radiators  Baseboard radiators  Wall, floor, ceiling panels  Fan coil units www.engineersportal.in

11. HVAC Systems All-Water Systems Fan coil unit Unit ventilator (4-pipe) www.engineersportal.in

12. HVAC Components: Duct System www.engineersportal.in

13. HVAC Components: Supply Ducts Return Grille ReturnPlenum AirHandler SupplyPlenum Duct System www.engineersportal.in

14. HVAC-induced infiltration Infiltration rates - Florida Duct Study 1990 Duct Leakage www.engineersportal.in

15. HVAC Systems All-Water Systems Fin tube radiator Cast iron radiator www.engineersportal.in

16. HVAC Systems All-Water Systems Water loop heat pump (California loop) www.engineersportal.in

17.   Florida  50 all electric homes  13% total building leakage in duct system  17% savings  $200 cost Duct Leakage Research 1990 www.engineersportal.in

18. EFFECTS ON HUMAN BODY www.engineersportal.in

19. Summary Selecting efficient air conditioning based on your climate. Selecting the proper type of and efficiency heating system for your climate Designing and sealing air distribution systems properly. HVAC efficiency includes: www.engineersportal.in