Brochure

12
Energy Savings at the Pump(s)
The pump affinity laws can be used to gauge the impact of using a PICV in place of a globe valve on the distribution
system. As can be seen in the equations, any flow change that occurs in the system will have a squared effect on the
pressure drop in the system, and a cubed effect on the power requirements to deliver the desired flow.
This can be used to gauge the impact on the pump and its performance.
Where: q = water flow N = pump speed H = pump head BHP = pump power
Flow
(GPM)
∆T
(°C)
∆T
(°F)
Power
(BTU)
Cooling
(BTUH)
PICV Average 19.81 8.1 0 143,309.95 1,863,029.33
Globe Average 22.82 6.9 0 141,603.88 1,839,144.34
BHP
PICV
=
q
PICV
3
BHP
Globe
q
Globe
( )
BHP
PICV
=
19.81
3
= 0.65
BHP
Globe
22.82
( )
E
saving% ∝
BHP
saving%
E
saving%
= 100%
*
(1 – 0.65)
E
saving%
= 35%
Pump Affinity Laws
When fitted with a PICV, the same AHU can
satisfy the same cooling load with 35% less
pump energy and an increased delta-T.
q
PICV
=
N
PICV
q
Globe
N
Globe
H
PICV
=
N
PICV
2
H
Globe
N
Globe
( )
BHP
PICV
=
N
PICV
3
BHP
Globe
N
Globe
( )
An easier Delta-T solution
Pressure independent control valves improve system
performance and optimize delta-T. Siemens PICVs integrate
three functions into a single device. Siemens PICVs have the
unique advantage of always maintaining their full stroke,
regardless of the maximum adjustable flow setting, to
provide better control. This significantly reduces or eliminates
hunting for the right actuator setting, resulting in better
control and increased comfort.
Every Siemens valve and actuator is factory tested and
goes above and beyond with rigorous lifecycle testing
for higher reliability.
The HVAC Integrated Tool (HIT) filters and calculators that
help you properly size and select the right PICV for your
application easily.
On-site commissioning is simple thanks to the easy max flow
pre-setting and automatic balancing. With Siemens PICVs,
there are less components, less installation effort and fewer
leak points which leads to no callbacks.
75+ Years
Innovating
control valves
Up to 1 Million
Repositions
for longer life
Up to 100 Thousand
Full strokes
Less Effort
Fewer components,
less installation effort,
and no callbacks
Fast and Easy
Product selection
and commissioning
100%
Factory tested