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CITY OF BEVERLY: GEOTHERMAL FEASIBILITY

BEVERLY, MA

OPPORTUNITY

The Beverly Public Library is used by City residents as a community center and loans over 350,000 items annually to almost 27,000 borrowers. The library was built in 1855, consists of four floors, and is approximately 47,000 square feet. The HVAC equipment (installed in 1993) has reached the end of its useful life and needs replacement. The City of Beverly has committed to be Carbon Neutral by 2040 and wanted to understand how to incorporate a carbon reduction strategy into the complete replacement of existing HVAC systems. Since B2Q has been successfully providing energy and HVAC services to the City for more than 10 years, they commissioned B2Q to assist with this important assignment

CHALLENGE

Like many other municipalities the City of Beverly has buildings with aging infrastructure and are forward looking towards replacing these systems with energy efficient electric heating and cooling systems, building envelope improvements, and renewable energy sources to fulfill their commitments to combat the impact of site-based fossil fuel usage. The challenge they face is how to make these upgrades while controlling construction and operating costs.

RESULTS

B2Q used design software tools to model the building’s heating and cooling loads and created custom-bin analysis spreadsheet models to estimate the energy performance of three different options. The first option proposed an in kind replacement of the existing air side equipment, using as much of the existing duct and piping infrastructure as possible. The second option proposed replacing the existing mechanical equipment with new, similar capacity units utilizing air-source heat pump RTUs and split-type AHUs with air cooled DX heating & cooling. The third option, geothermal heat pumps, would be would be capable of achieving 100% decarbonization. B2Q worked collaboratively with Achieve Renewable Energy to study this option. The geothermal system relies on the Ground Heat Exchanger (GHE) as a source or sink for heat energy. The water-air source heat pumps utilizing the ground heat exchanger as a geothermal source/sink will ultimately provide the city with 100% decarbonization when coupled with 100% renewable electricity.
Beverly recently decided to pursue the geothermal heat pumps option and selected B2Q Associates as the Prime Design Consultant through a public RFQ. The B2Q-led design team includes e3i Engineers and Achieve Renewable Energy, and a cost estimating consultant, civil engineer, architect/envelope specialist, and landscape architects.

  • SIZE: 47,000 SQ FT

  • ANNUAL ELECTRIC SAVINGS: 205,674 KWH

  • ANNUAL GAS SAVINGS: 20,144 THERMS

  • ANNUAL ENERGY COST SAVINGS: $60,246

  • ESTIMATED CONSTRUCTION COST: $3,750,000

  • ESTIMATED UTILITY INCENTIVES: $544,000

Market:

Public Sector

Services:

Energy Efficiency & Analysis
Electrification
Building Decarbonization
Feasibility Study
Geothermal Heat Pump
Project Design

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