3.8.8 Plant Management

Plant management is a method of sequencing equipment. Separate plant management schemes may be entered for chilled water systems, hot water systems, etc. The following building descriptors are specified for each load range, e.g., when the cooling load is below 300 tons, between 300 tons and 800 tons, and greater than 800 tons.

Equipment Type Managed

Applicability

All plant systems

Definition

The type of equipment under a plant management control scheme. Choices include:

  • Chilled water cooling
  • Hot water space heating
  • Condenser water heat rejection
  • Service water heating
  • Electrical generation

Units

None

Input Restrictions

As designed

Baseline Rules

Same as the proposed design

 

Equipment Schedule

Applicability

All plant equipment

Definition

A schedule which identifies when the equipment is in service.

Units

Data structure

Input Restrictions

As designed

Baseline Rules

Where multiple equipment is used, they shall be staged in operation.

 

Equipment Operation

Applicability

All plant equipment

Definition

Equipment operation can be either On-Demand or Always-On. On-Demand operation means the equipment cycles on when it is scheduled to be in service and when it is needed to meet building loads, otherwise it is off. Always-On means that equipment runs continuously when it scheduled to be in service.

Units

None

Input Restrictions

As designed; the default is On-Demand.

Baseline Rules

Assume On-Demand operation

 

Equipment Staging Sequence

Applicability

All plant equipment

Definition

The staging sequence for plant equipment (chillers and boilers) indicates how multiple equipment will be staged on and off when a single piece of equipment is unable to meet the load.

Units

Data Structure – this should include (a) the percent of capacity above which additional equipment is staged on and (b) the percent of capacity below which one plant equipment is staged off

Input Restrictions

As designed

Baseline Rules

Software shall bring the first boiler to 100% capacity prior to the staging of the next boiler. When more than one chiller is required in the baseline design, each chiller shall run to full capacity prior to staging of the next chiller. When more than one chiller is operational, then the load shall be shared equally among all the chillers.

Building EQ


 

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