To that end, Spectrum specified E-Mon, LLC of Langhorne, PA, a leading supplier of electric submeters and automatic meter reading (AMR) systems and services. GT Sales, E-Mon's Salt Lake City rep, and Winlectric, the local E-Mon distributor, were instrumental in coordinating the purchase and delivery of the metering equipment to Spectrum's electrical contractor. During the design phase, Sim Gurewitz, E-Mon's regional manager, worked closely with Spectrum to ensure the seamless integration of the system's eight E-Mon D-Mon Class 3000 submeters with the facility's BACnet building automation system. Communicating the raw energy data via Ethernet to the BAS, the energy data is used for in-lobby display in both offices, as well as for overall energy analysis by Spectrum Engineers.
The heart of the submetering system is the E-Mon D-Mon Class 3000, a low-cost intelligent meter with advanced functions, including scrolling displays of consumption in kilowatt hours (kWh), demand in kilowatts (kW), along with peak date & time, real-time kW load and per phase Amps and Volts. In operation, the energy data is captured via 0-2 V output split-core current sensors, which are quickly installed without power interruption, up to 500 feet from the electrical panel they are monitoring. A strong advantage of the Class 3000 meter for measurement & verification (M & V) is the ability to accept pulse inputs from all types of utility meters, including water, gas, steam, etc. and communicate these measurements to the BAS. Flexibility for almost any building system monitoring need is assured by the availability of standard communication options including telephone modem, pulse output, Modbus RTU and TCP/IP, Ethernet, BACnet IP and MS/TP and Lonworks Twisted Pair.
Main flat-panel screen in Spectrum Engineers' front lobby shows current weather conditions and real-time displays of demand (kW) and other metered parameters. At right, interactive features guide users to a number of colorful subscreens illustrating Spectrum's total energy profile in real-time.
Performance Indicators at Spectrum
Spectrum Engineers' David Affleck is pleased with the submeterins' performance monitoring capability. "Two selling points of the E-Mon system were its BACnet capability, which allows us to interface with our existing BAS and the easy integration of the meters." The system's been running for about 6 months now, providing an attractive display of 36 building automation system parameters on a large flat-screen monitor in the front lobby. "Through the interactive medium," he said, "everyone at Spectrum Engineers has a stake in monitoring facility performance and becoming an equal partner in the energy conservation process."
As collected by the E-Mon D-Mon Class 3000 meters, the high-definition screen in the lobby (Figure 1) displays a real-time snapshot of: delivered energy (kWh), real power (kW), apparent power (kVa), power factor (%), current load (A) and line-to-line Voltage (V) for the following building systems:
- Air Handling
- Back-up Power
- Domestic Hot Water
- Plug Load
Submetering for LEED Points in Commercial Interiors (CI)
On the cutting edge of sustainable facility design, Spectrum has seen first hand the value that submeters adds for the precise measurement and verification needs of LEED, Green Globes and other high-performance building assessment systems pervading the facility landscape.
In LEED-CI certification processes like Spectrum's, submetering equipment is useful for a variety of functions. For example, commissioning agents can use energy intelligence software like E-Mon Energy to identify functionality and performance of electric, water and gas systems. In new construction, submeters are useful for baselining facility energy performance, and in renovation scenarios where at least 12 months of energy data can be collected to provide a highly acurate profile of the using facility's energy patterns over time. In addition to LEED's New Construction (NC) and Core & Shell (CS) categores, submeters are extremely useful in obtaining points in the Energy and Atmosphere (EA) section of Commercial Interiors (CI) category as shown in the table below.
|Section Title & Credit
|Energy & Atmosphere
(EA) Prerequisite 1
|Fundamental Commissioning of Building System
||Verify project's energy related systems are installed & calibrated according to project documentation
|EA Prerequisite 2
||Minimum Energy Performance
||Establish minimum energy-efficiency level for tenant space systems to reduce economic impact of higher energy use on environment
|EA Credit 2
||Up to 5
||Verify and ensure that the tenant space is designed, constructed and calibrated to operate as intended
|EA Credit 3
||Measurement & Verification (M & V)
||Up to 5
||provide for ongoing accountability of building energy consumption over time
|EA Credit 4
||Up to 5
||Encourage development and use of grid-based renewable energy sources on a net zero pollution basis.
|Regional Priority Credit 1
||Up to 4
||Provide an incentive for achieving credits that address geographically specific environmental priorities
|Specific LEED Version 3 Commercial Interiors (CI) sections and potential points facilitated by the use of electric submeters.
Recent industry studies show that green building construction will continue to be a major trend across the facility landscape. An enabling technology, submeters can help facilities improve their bottom lines by benchmarking, measuring and verifying compliance with the major energy initiative guidelines, while also encouraging every level of the enterprise to become a stakeholder in the energy management and conservation process. Spectrum Engineers' LEED Platinum certification project is a case in point of how submeters are helping state-of-the-art buildings achieve sustainability, improve and encourage environmental stewardship throughout every level of the organization.
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