|
|
| Pumps |
| Booster Systems |
| Pump Accessories |
| Valves |
| Heat Exchangers |
| Cooling Towers |
| Water/Wastewater Equipment |
| Lift Stations |
| Tanks |
| Cellular Monitors |
| Filtration Equipment |
| Motors & Controls |
|
|
| |
| Energy Savings Analysis |
| How to select efficient pumps for low operating cost and low life cycle cost? |
| Look at our example below that compares Pump A vs Pump B for the
same application design conditions of service (DCOS):
|
|
|
|
| DCOS: |
|
|
|
| GPM = 3000 |
|
Pump A Efficiency at DCOS = 86% |
|
| TDH = 150 |
|
Pump B Efficiency at DCOS = 81% |
|
|
| Assumptions: |
-
DCOS: 3000 GPM @ 150 TDH
-
Constant speed pump operation
-
Pump A is 86% Efficient at DCOS
-
Pump B is 81% Efficient at DCOS
-
Pump system motor efficiency is set at 95%
-
Power Cost is $.06/KwH
-
Pumping Water with 1.0 Specific Gravity
-
8000 hours/yr annual pump operation
|
| |
| Brake Horse Power = |
GPM x TDH x SG
|
|
3960 x Pump Efficiency
|
|
| |
| Pump A |
Req. BHP
|
=
|
3000 x 150 x 1.0
|
=
|
132.1
|
|
|
|
|
3960 x 86% Pump Eff
|
|
|
|
| |
|
|
|
|
|
|
| Pump B |
Req. BHP
|
=
|
3000 x 150 x 1.0
|
=
|
140.3
|
|
|
|
|
3960 x 81% Pump Eff
|
|
|
|
|
|
|
|
|
|
|
| Difference in Pump A and Pump B BHP |
=
|
( 140.3 - 132.1 )
|
=
|
8.2
|
|
| NOTE: Pump B requires 8.2 BHP more than Pump A |
|
|
|
| |
|
|
|
|
|
|
| Energy Savings =
|
BHP diff x .746 Kw/BHP x 8000 hrs/yr
|
|
|
|
|
motor efficiency |
|
|
|
| |
|
|
|
|
|
|
| Therefore Energy Savings = |
8.2 BHP x
.746 KW/BHP x 8000 hrs/yr |
=
|
51,240
|
KwH/yr
|
|
95% Motor Efficiency |
|
|
|
| |
|
|
|
|
|
|
| Operating Cost Savings = |
51,240 KwH/year
|
x
|
$0.06 per KwH
|
=
|
$3,074
|
per year |
| |
|
|
|
|
|
|
Assuming 20 year pump life, the total operating cost savings for
selecting
the higher efficiency pump is |
=
|
$61,487
|
|
| |
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
For assistance in calculating the cost of pumping and life cyle
cost, please call SPE
at (800) 890-0935 or email us at
sales@southeastpump.com. |
| |
|
|
|
|
|
|
|