Hello, I am working on a complex chilled water plant model where I have 2 Cooling Towers with Lead/Lag Condenser Water Pumps, 2 Chillers with in-line chilled water pumps, and lead/lag chilled water pumps on secondary circuits.

I am referring to current protos which has defined various pipe equips such as: Cooling Tower

• Condenser Water Entering Pipe Equip
• Condenser Water Leaving Pipe Equip

Chiller

• Chilled Water Entering Pipe Equip
• Chilled Water Leaving Pipe Equip
• Condenser Water Entering Pipe Equip
• Condenser Water Leaving Pipe Equip
• Condenser Water Header Pipe Equip
• Chilled Water Header Pipe Equip

Using this pipe equip I am not able to build a complete model

I have the following questions:

1. Is Header Pipe Equip a common representation of Supply & Return, or do we have to build separate equip for Header Supply Pipe and Header Return Pipe?
2. In my case I have two lead/lag pumps on the condenser water line where one header line has again two parallel joints for which these pumps are installed? How should I model these pipes equip with what name and tags?
3. On the Chilled Waterside, I have two lead/lag pumps on the secondary circuit of the chilled water line. How will I model those pipes equip?
4. On the Chilled Water load side i.e. chilled water supply or return going to building loads (such as AHUs, FCUs), how do I build a model for this pipe equip?

Will you please help me on this?

I don't typically model out every pipe as listed, but rather loops as needed to differentiate points and equipment. I would do something like this:

Plant at the top

@chwPlant plant chilled water equip

Primary Loop

@primChwLoop chilled water pipe primaryLoop equip  equipRef:@chwPlant
  @pchwp1 chilled water pump equip equipRef:@primChwLoop
  @pchwp2 chilled water pump equip equipRef:@primChwLoop

Secondary Loop

@secChwLoop chilled water pipe secondaryLoop equip equipRef:@chwPlant
  @schwp1 chilled water pump equip equipRef:@secChwLoop
  @schwp2 chilled water pump equip equipRef:@secChwLoop

  @schwst chilled water leaving temp sensor point equipRef:@secChwLoop
  @schwrt chilled water entering temp sensor point equipRef:@secChwLoop

Condenser Loop

@cwLoop condenser water pipe primaryLoop
  @ct1 coolingTower equip equipRef:@cwLoop
  @ct1 coolingTower equip equipRef:@cwLoop
  @cwp1 condenser water pump equip equipRef:@cwLoop
  @cwp2 condenser water pump equip equipRef:@cwLoop

  @cwst condenser water leaving temp sensor point equipRef:@cwLoop
  @cwrt condenser water entering temp sensor point equipRef:@cwLoop

I will typically put the chillers right under the plant since they are connected to multiple loops. If each chiller has a dedicated pump I would add a chilledWaterRef tag (or condenserWaterRef) to identify the pump.

@chiller1 chiller and equip and equipRef:@chwPlant chilledWaterRef:@pchwP1
@chiller2 chiller and equip and equipRef:@chwPlant chilledWaterRef:@pchwP2

All Chilled water AHUs and FCUs would then get a chilledWaterRef tag.

@ahu1 ahu equip chilledWaterRef:@chwPlant

This is certainly not the only way to do it, but more or less how I would do it.