What are the main components of a district cooling plant?

For water cooled chiller you will find this component , it will change if you use air cooled chiller

1. Centrifugal Chillers
2. Condenser water Pumps
3. Chilled Water Primary Pumps
4. Chilled Water Secondary Pumps
5. Cooling Towers
6. Make up water pumps for Cooling Towers
7. Chemical Dosing system for Cooling Towers
8. Chemical Dosing system for chilled water network
9. R.O Plant for blow down water re-claim
10. Water Storage Tank for Cooling Towers / Fire Pumps
11. Blow Down Storage Tank
12. Thermal Storage Tanks

i believe the above mentioned answer are sufficient to be detailing the major components

• Chillers (as per the load)
• Condenser and chilled water pumps water Pumps
• pressuriztion units.
• Valve boxes and vale arrangements
• Water meters
• Cooling Towers including makeup water system
• Chemical dosing and other agents

• R.O Plant (if applicable)
• Storage (normal and chilled water)

district cooling system=almost thermal power plant (chillers,cooling towers,cws,cwrs,secondary @primary pumps,water storage tanks,water supply etc

In addition to regular items like Chillers, Cooling Towers, Condenser Water Pumps, Chilled water Pipes, makeup water system for condenser and chilled water, controls etc etc. I want to highlight two things which make the system Energy Efficient, Cost Effective and less pay back period, these things:

1. Thermal Storage Tanks

2. Primary, Secondary and Tertiary Chilled water pumps.

• Ice storage.
• Central Chillers. 
• Distribution Network. 
• User Station.

 For District Cooling Palnt acentral chiller plant, a pump house and a distribution pipeline network are required.

• Central Chiller Plant - generate chilled water for cooling purposes.
• Distribution Network - distribute chilled water to buildings
• User Station - interface with buildings' own air-conditioning circuits.

1 - Plant ( Absorption Chillers - ATS system )

2 - Distribution Piping system ( pipes and valves)

3 - Customer's system ( heat exchangers, BTU meters, Circulation pumps and water treatment system)