NHP Foundation: Bayview Towers

Background

Bayview Towers Apartments is a 200-unit affordable apartment complex for families. The property consists of two high-rise style buildings – 21-story and 9-story, respectively – and was built in 1973. In 2012, NHP began a significant renovation of the property that included kitchen and bathroom upgrades, domestic and sanitary plumbing line upgrades, new flooring, new windows, new electrical panels, new AC units, and energy-efficient appliances, windows, and lighting. Exterior concrete repairs, a new roof, and a new look for the exterior of the buildings completed the renovation in 2014. While energy savings of 17 percent were documented in Portfolio Manager, boiler and domestic hot water (DHW) upgrades remained unaddressed and an opportunity for substantial energy savings.

Solutions

This project was done in conjunction with an energy audit performed by Steven Winter Associates, Inc. The goal was to identify any low-hanging fruit that would be available for the property. It was determined that the HVAC and DHW systems were the two buildings systems that had not been addressed in the 2012 renovation. Knowing this, project engineers worked to design a system that not only increased the current level of efficiency and reliability, but also maximized all available utility incentives from the properties service provider Eversource. The efficiency of the system was dramatically increased, as were the projected energy and operational cost savings, with the Eversource funding that accounted for 54% of the project cost. The system features a bank of hi-tech condensing boilers with superior operating efficiencies of up to 99% efficiency integrated with three indirect water heaters along with new pumps and variable frequency drives (VFDs) to help reduce both natural gas and electric consumption associated with these system loads.

ANNUAL ENERGY USE

(Source EUI)

ANNUAL ENERGY COST

ANNUAL WATER USE

ANNUAL WATER COST

ANNUAL PLANT ELECTRICITY USE

ANNUAL PLANT ELECTRICITY COST

IN BUILDING ENERGY USE

IN BUILDING ENERGY COST

ACROSS NETWORK USE

ACROSS NETWORK COST

ANNUAL EMISSIONS

USE

COST

Bayview Towers

Original Boiler System (circa 1972)

New Boiler System (circa 2017)

NHP Foundation: Bayview Towers

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Bayview Towers

Original Boiler System (circa 1972)

New Boiler System (circa 2017)