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Walden Pond Visitor Center

General Energy Use, Strategies and Systems

Energy Use:

The project contains the following systems and strategies related to building energy use:
- Super-insulated building envelope
- LED lighting with occupancy and daylight sensors
- Building Management System for control of lighting and HVAC systems
- Rooftop solar hot water system
- On-site PV parking canopy
- EV charging stations

Energy Strategies:

The guiding energy strategy for the building was to start from a lowest level of energy use possible. Through the systems and strategies listed above the project achieved a low baseline energy use level before employing the on-site PV system to offset the remaining building energy use.

Zero Net Energy Definition Used Site Energy Use

Monthly Energy Data and Utilities

Energy Data Type:
Modeled, Verified
Electric Utility:
Concord Municipal Light Plant
Gas Utility:
N/A
Other purchased Fuels:

None

Datasets and utility bills:
AttachmentSize
PDF icon Electric bills representing approx one year of building energy usage747.68 KB
PDF icon PV generation data for same time frame as electric bills101.1 KB
Datasets and utility bills sources and reliability:

Generation data is taken from PV array metering as captured continuously on PV array website. Usage numbers are provided from utility bills (Concord Electric) as logged by building meter.

Cogeneration

Cogeneration System Description:

N/A

Renewables and Energy Balance

Renewable Energy Sources:
Renewable energy is generated on-site but not on the building (e.g. wind turbine in the parking lot)
Renewable Energy System Description & Details
Within the main parking area of the park is a RBI Parking Canopy Array with 336 qty Upsolar 315W modules - each w/ module-level DC optimizers, feeding 8 qty Solaredge SE11400A-US inverters. These are arranged on two equal-sized carport structures, single 5 degree tilt each. Azimuths 6 deg & 27 deg East of True South.
Annual renewable energy generated 103,224 kWh
Annual Renewable Energy Generated Data Type Measured
Power Rating Renewable Energy System Type(s) Source of Annual Production Data
105,840Watts Photovoltaics PV production numbers were measured from array meter data October 01, 2016 through September 30, 2017 and represents PV array gross production.

Storage and Installed Capacity

Energy Storage type

N/A
Energy Storage Capacity

Annual Energy Import/Export

Electricity amount (imported from grid) 37,100 kWh/year
Electricity amount (credited or exported to grid) 68,448 kWh/year