DLLR Strategy - Metasys - LIT-12011288 - Software Application - Metasys Building Automation System - 6

DLLR Technical Bulletin

Product
Building Automation Systems > Building Automation Systems > Metasys Building Automation System
Document type
Technical Bulletin
Document number
LIT-12011288
Version
6
Revision date
2013-10-15

The foremost decision before configuring DLLR is to select whether to use Demand Limiting, Load Rolling, or both. Each strategy has a slightly different method of saving energy costs and requires a different set of parameters.

Demand Limiting can be used if your utility company charges a higher energy usage rate during periods of peak demand. For example, higher rates may be in effect from 12:00 noon until 6:00 P.M. Monday through Friday during the summer months. In this situation, loads can be shed during the higher cost periods, then released when the rates go down. You may notice, however, that a brief surge in energy usage may occur when the peak period expires, but because the cost per kilowatt goes down, actual cost savings are realized.

Load Rolling can be used if the facility can shed loads without affecting occupant comfort or productivity. For example, a set of nonessential lights in an indoor parking garage can be shed during the day without affecting security, or perhaps lighting and fan operation serving a conference room can be shed when it is unoccupied. LR would not be a good choice for critical environments, such as clean rooms.