Understanding Energy Use Frank Rendina NYPD

The Police Academy FY 2013FY 2014 FY 2012FY 2013 Jun-2013Jul-2013Aug-2013Jun-2012Jul-2012Aug-2012%Increase June % Increase July % Increase August Electricity Cost ($)$61,987.32$74,456.47$63,572.75$68,647.81$75,779.87$61, %-1.75%3.84% Electricity Demand (KW) 1, , , , , %-1.94%-7.74% Electricity Usage (KWH) 421, , , , , , %8.96%1.50% Steam (mlbs) %36.21%113.43% Steam Cost ($)$9,183.25$9,202.01$9,533.60$7,449.88$7,821.97$7, %17.64%28.49% Total Cost ($)$71,170.57$83,658.48$73,106.35$76,097.69$83,601.84$68, %0.07%6.50% Total Usage (mmBTUs) 1, , , , , , %9.99%6.41%

Possible Causes Additional steam consuming equipment Leaks in the steam lines Leaky steam traps Faulty equipment

Typical Hourly Usage

Operating Characteristics of Facility Classes are held 18 hours/day Facility has cadets, Traffic, School Safety and civilian classes all through the day. Classes end by midnight.

The Showers

Existing System

The Solution Install low flow shower heads Include individual isolation valves

The Calculations Typical flow = 3.5 gallons/min Q= M C Delta T Q for 1 faucet= 78,750 BTU/hr Q for 55 faucets= 4,331,250 BTU/hr Typical flow = 5 gallons/min Q= M C Delta T Q for 1 faucet= 112,500 BTU/hr Q for 10 faucets= 1,125,000 BTU/hr Combined Q= 5,456,250 BTU/hr

The Energy Savings Assumption: 15% the total number of showers are used during the day. Potential Savings using 2.0 gpm shower heads only: 56,953,125 BTU/Month Potential Cost Savings for August: $4,422.90

Lessons Learned Understand how the building is being used Expect the unlikely Exhaust all avenues Have fun doing it

Questions