Federal Reserve Bank of Boston Case Study John Yahoodik, Senior Project Manager Federal Reserve Bank of Boston Rick Dorricott, Design Services Manager Energy Investment, Inc.

Federal Reserve Bank of Boston Designed 1972, completed 1976 33 story tower; 5 story low-rise Unique support functions 1,130,000 square feet Steel construction with glass & aluminum facades Steam heating Electric powered chiller cooling

Federal Reserve Bank of Boston Project Objectives Energy efficiency, utility cost reduction Facility improvement, lighting and mechanical systems Environmental management, CFC compliance

Federal Reserve Bank of Boston Owner’s Agent: Energy Investment, Inc. Integrated energy improvement program Chiller replacement program chiller specification and selection system design competitive bidding construction review

Federal Reserve Bank of Boston Electric End-Use General office and banking 5 am - 6 pm weekdays 7 am - 1 pm weekends some 24 hour operation 24,000,000 kWh annual electricity consumption

Federal Reserve Bank of Boston Electricity Use Monthly electricity consumption 1992-93 Monthly electricity demand 1992-93 relatively flat demand

Federal Reserve Bank of Boston Natural Gas and Steam Use Monthly natural gas consumption 1992-93 used for cooking Monthly steam consumption 1990-1993 used for heating

Federal Reserve Bank of Boston Original Chillers 3 York 1200 ton chillers 0.82 kW/ton R-500 refrigerant chiller 2 on in spring chiller 3 for summer loads chiller 1 used for backup 8 heat recovery chillers 20-100 tons, 330 tons total R-22 refrigerant 0.93 - 1.48 kW/ton summer and winter loads heat recovered for hot water

Federal Reserve Bank of Boston Chiller Replacement - Logistical Issues Bank Security On-going operations Time constraints Space constraints Future flexibility Facility location

Federal Reserve Bank of Boston Chiller Options Studied for CFC Compliance Retrofit existing chillers for non-CFC refrigerant Replace with high-efficiency, non-CFC models Steam absorption units Gas-fired units District cooling

Federal Reserve Bank of Boston Criteria for Evaluating Options Reliability, long life Stand-alone entity Independent operation Energy efficiency and performance Life-cycle cost Operation and maintenance considerations Environmentally friendly, CFC compliance

Federal Reserve Bank of Boston Chiller Replacement Option Chosen Primary chillers - 3 Carrier 1200 ton chillers 0.56 kW/ton R-134a refrigerant Heat recovery chillers - 8 Carrier

Federal Reserve Bank of Boston HVAC Improvements

Federal Reserve Bank of Boston Lighting Improvements Upgraded fluorescent lighting Specular reflectors High efficiency incandescent lamps New LED exit kits Metal halide retrofit kits Incandescent converted to fluorescent

Federal Reserve Bank of Boston Lighting Improvement Results

Federal Reserve Bank of Boston Integrated Energy Program Other energy efficiency improvements help pay for chiller replacement for CFC compliance Shorter overall program payback period

Federal Reserve Bank of Boston Project Timeline 8 months for engineering analysis 18 months for project approval 21 months to purchase, design and build

Federal Reserve Bank of Boston Five Construction Phases Remove chillers 2 & 3 Install & activate new chiller 2 & refrigerant monitoring system Remove chiller 1 Install and activate chillers 1 & 3 Remove heat recovery chillers 4 & 5 and install new ones

Federal Reserve Bank of Boston Project Results Still under construction Expect to save 5,300,000 kWh a year Annual $730,000 savings Switch to R-134a, an HFC refrigerant, not scheduled for phaseout Improved lighting and HVAC systems Only a 5 year project payback period