Understanding Energy Use
Frank Rendina
NYPD
The Police Academy
FY 2013
FY 2014
Jun-2013
Jul-2013
Aug-2013
FY 2012
FY 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 $61,224.27
-9.70%
-1.75%
3.84%
Electricity
Demand (KW)
0.00%
-1.94%
-7.74%
-5.56%
8.96%
1.50%
1,020.24
1,057.20
949.20
1,020.24
1,078.08
1,028.88
Electricity Usage 421,600.00 530,000.00 486,000.00 446,400.00 486,400.00 478,800.00
(KWH)
Steam (mlbs)
107.00 79.00 143.00 76.00 58.00 67.00 40.79% 36.21% 113.43%
Steam Cost ($)
$9,183.25
$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%
-3.11%
9.99%
6.41%
Total Usage
(mmBTUs)
1,558.45
$9,202.01
1,897.13
$9,533.60
1,818.46
1,608.46
1,724.87
1,708.98
Possible Causes
•
•
•
•
Additional steam consuming equipment
Leaks in the steam lines
Leaky steam traps
Faulty equipment
Typical Hourly Usage
Steam Usage (Mlbs)
450
400
350
300
250
200
150
100
50
0
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 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