Post on 22-Feb-2016
description
Understanding Energy Use
Frank RendinaNYPD
The Police Academy FY 2013 FY 2014
FY 2012 FY 2013
Jun-2013 Jul-2013 Aug-2013 Jun-2012 Jul-2012 Aug-2012 %Increase
June% Increase July
% Increase August
Electricity Cost ($)
$61,987.32 $74,456.47 $63,572.75 $68,647.81 $75,779.87 $61,224.27 -9.70% -1.75% 3.84%
Electricity Demand (KW)
1,020.24 1,057.20 949.20 1,020.24 1,078.08 1,028.88 0.00% -1.94% -7.74%
Electricity Usage (KWH)
421,600.00 530,000.00 486,000.00 446,400.00 486,400.00 478,800.00 -5.56% 8.96% 1.50%
Steam (mlbs) 107.00 79.00 143.00 76.00 58.00 67.00 40.79% 36.21% 113.43%
Steam Cost ($) $9,183.25 $9,202.01 $9,533.60 $7,449.88 $7,821.97 $7,419.64 23.27% 17.64% 28.49%
Total Cost ($) $71,170.57 $83,658.48 $73,106.35 $76,097.69 $83,601.84 $68,643.91 -6.47% 0.07% 6.50%
Total Usage (mmBTUs)
1,558.45 1,897.13 1,818.46 1,608.46 1,724.87 1,708.98 -3.11% 9.99% 6.41%
Possible Causes
• Additional steam consuming equipment• Leaks in the steam lines• Leaky steam traps• Faulty equipment
Typical Hourly Usage
08/22/2012 00:00
08/22/2012 01:00
08/22/2012 02:00
08/22/2012 03:00
08/22/2012 04:00
08/22/2012 05:00
08/22/2012 06:00
08/22/2012 07:00
08/22/2012 08:00
08/22/2012 09:00
08/22/2012 10:00
08/22/2012 11:00
08/22/2012 12:00
08/22/2012 13:00
08/22/2012 14:00
08/22/2012 15:00
08/22/2012 16:00
08/22/2012 17:00
08/22/2012 18:00
08/22/2012 19:00
08/22/2012 20:00
08/22/2012 21:00
08/22/2012 22:00
08/22/2012 23:00
0
50
100
150
200
250
300
350
400
450
Steam Usage (Mlbs)
Steam Usage (Mlbs)
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 SavingsAssumption: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