Outline and principle of AC systems Cycle of Air Coditioning Basisc principle and modification of Cycles Basic principle of Screew Chiller and Condensor, AHU, VAM etc

1. एयर क
ं डिशड ं ग डिस्टम
AIR CONDITIONING
SYSTEM
बालाजी
BALAJI KUNDETI
(TG-BOP group)

2. Contents
• Air conditioning system for TG area
• Air conditioning system for ESP and water
system control building
• Air conditioning system for static excitation
room
• Air conditioning system for offsite control
rooms, C&I panel rooms, Swyd area etc..

3. Air conditioning system for TG area
List of equipments :
• Water cooled type chillers – 3 Nos. (2W + 1S )
• Chilled water pumps – 3 Nos. ( 2W + 1S)
• Condenser water pump – 1 No. (standby)
• Cooling tower – 1No. ( standby)
• Expansion tank – for chilled water
• AHU’s – 6 Nos. (4W + 2S) for 17m CCR and 8.5m CER &
UPS/battery chargers
• AHU – 2Nos. for SWAS room
• Fresh air fans – 2 Nos. in “24”m and 1 No. in “0”m

4. SLD of Air conditioning system for TG area
1M3
SCREW
CHILLER
(2W+1S)
AHU
COOLING TOWER
EXPANSION TANK
CHILLER WATER
PUMPS (2W+1S)
COOLING WATER
CONDENSER
WATER PUMP
HVAC
FROM
SACW
COOL AIR
RETURN AIR

5. Screw chiller
• Screw chiller make & model: kirloskar chiller KWK 240.24
• Quantity - 3 Nos. (2W + 1S)
• Rated capacity : 185 TR
• Refrigerant : R- 134a
• Condenser type: Water cooled ( shell and tube arrangement,
CW in shell)
• No. of compressors : 2 (semi hermetic screw type)
• Type of expansion valve: Electronic expansion valve

6. Screw chiller

7. Screw chiller

8. AHU
• AHU’s 1 to 6 are for 17m CCR, 8.5m CER & UPS/Battery
charger room
• Capacity of each AHU (1 to 6) : 62000 CMH
• AHU 7 & 8 are for SWAS room
• Capacity of each AHU (7 & 8) : 10000 CMH
• AHU motor is a VFD driven drive
• AHU blower is a DIDW backward curved centrifugal type
• Each AHU have 1 pre filter, fine filter and Cooling coil

9. AHU

10. AHU SYSTEM
• HEPA filter (high efficiency particulate arresting) :
it removes 99.97% of airborne particles of size 0.3micron m
commonly used in medical facilities, aircrafts, automobiles etc
• Temp. and humidity sensors are provided in return air duct to
AHU room
• Three way mixing valve – to control return air temp. and
humidity
• Strip Heaters -
Will be functioning at higher limits of RH,
Interlocked with RA temp, AHU running & safety thermostat

11. AHU SYSTEM
• Pan humidifiers –
Will be functioning at lower limits of RH,
Interlocked with RA temp, AHU running & safety
thermostat
Water supply is from HVAC
• Motorised fire dampers (MFD): normally in open
position but in case of any fire alarm, all these MFD’s
will close
• Volume control dampers(VCD): these are manually
operated dampers

12. COOLING TOWER
• MAKE : BELL cooling towers pvt. Ltd.
• TYPE : Induced draft counter flow
• No. of fans : 2
• Capacity of water circulation: 185 m3/hr
• Capacity of condenser water pump : 175 m3/hr
• Design Hot water inlet/ cold water outlet temp: 38/33 deg C
• FAN : Axial flow type
• Fan speed : 970 rpm
• Fan blade : Cast aluminium alloy

13. Cooling tower

14. AC system for ESP and Water system

15. AC system for ESP
• Type of AC system : Air cooled condensing unit type
• Make : Voltas ltd.
• No. of condensing units : 4 (2 per unit, 1W+1S)
• Capacity of condensing unit : 45 TR
• Compressor type : Hermetic Scroll type compressors
• No. of compressors per condensing unit : 4
• Condenser type : Air cooled (fans )
• No. of fans per condensing units : 4
• AHU’s : 4Nos. (2 per unit, 1W+1S)
AHU 9-10 for unit 1 and AHU 11- 12 for unit 2
Capacity of each AHU : 35000 CMH

16. AC system for Water system
• Type of AC system : Air cooled condensing unit type
• Make : Voltas ltd.
• No. of condensing units : 2( 1W+1S)
• Capacity of condensing unit : 25 TR
• Compressor type : Hermetic Scroll type compressors
• No. of compressors per condensing unit : 2
• Condenser type : Air cooled (fans )
• No. of fans per condensing units : 2
• AHU’s : 2Nos. (1W+1S)
AHU 13-14
Capacity of each AHU : 10000 CMH

17. AC system for Static excitation room
• Make : Climaveneta
• Capacity: 10 TR
• Total quantity: 8 ( 4 for each unit )
• Type of compressor : scroll type
• Type of condenser : Air cooled

18. Air conditioning system for offsite
• Split AC/ Cassettle AC type arrangement is
provided for all offsite control rooms, C&I
panel rooms, Switchyard office and control
room etc..

19. धन्यवाद
THANK YOU..