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Understanding & Designing systems
with variable speed pumps

3/4/2014

1
A LITTLE HISTORY LESSON…

3/4/2014

2
1 9 68
3/4/2014

3
TYPICAL EUROPEAN SYSTEM
Modulating TRV’s

Pump runs 24/7 (6k hrs)
Small pipe, wide ΔT

Low flow, high head
TYPICAL US SYSTEM
Series loop, fin-tube baseboard
 CI bb/radiators/convectors
 Radiant floor heating

Multiple zones, ...
STEEP CURVES VS. FLAT CURVES
Flat curve =

American curve
Steep curve =

European curve

3/4/2014

6
PUMP AFFINITY LAWS
2-4-8 Rule

Double pump speed,

flow  2X
Double pump speed,
head  4X
Double pump speed,
energy co...
SO WHY USE A
VARIABLE
SPEED PUMP?
WHY USE A VARIABLE SPEED CIRCULATOR?
Good question…
Best applications…
Zone valve or RFH

Zone pump?

Electrical savi...
ELECTRICAL SAVINGS????
5 007’s @ 80W each = 400 Watts
400 Watts ÷ 1000 = 0.4 kW
0.4 kW × 2,200 “on” hrs = 880 kWh
880 kWh ...
WITH ZONE VALVES…
1 007 (80W) + 5 Zone Sentry zone
valve (1.44W each)= 87.2 Watts
87.2 Watts ÷ 1000 = 0.0872 kW
0.0872 kW ...
WITH SUPER DUPER ECM…
1 Pump (20W) + 5 Zone Sentries
(1.44W each)= 27.2 Watts
27.2 Watts ÷ 1000 = 0.0272 kW

0.0272 kW × 2...
WHAT’S THE REAL COMPARISON?
$132/yr vs. $9/yr?
93%!!!

≈ $17.50/mo

$28.80/yr vs. $9/yr?
55%

$2.80/mo

3/4/2014

13
D#^* THIS Traffic JAM!
Design conditions

All zones calling
Max flow,

least resistance

15
AS ZONES SATISFY…
Less flow

 flow resistance

3 lanes merge

into 1

17
SYSTEM CURVES
Hydronic “fingerprint”
Unique for

each system
Where do they

come from?
DO THE MATH, BABY!
Need to calc system

flow, head
Head 1 ÷ Head 2 =

(Flow 1 ÷ Flow 2)2
Easier way…
MAP IT OUT…
NOW ADD THE PUMP…
Zone valves close
Flow goes down

Head pressure

007
Pump
Curve

goes up
Energy In =
Energy Out
DP ...
5 ZONE SYSTEM
70,000 BTUH
7 GPM @ 5’ head
Where does system

really work?
NUMBERS DON’T LIE…
• GPM = BTUH
DT × 500
•

DT = BTUH
GPM

•

DT = 70,000  500
9.5

• < 150

 500
1 ZONE CALLING
10,000 BTUH

1 GPM @ 5’ head
Where does it

really work?
NUMBERS STILL DON’T LIE…
• GPM = BTUH
DT × 500
•

DT = BTUH  500
GPM

•

DT = 10,000  500
2

• 100
The Result?

And when it’s
350 out?
3/4/2014

31
3/4/2014

32
SO BOTTOM LINE..
Zone valve

FOR PETE’S SAKE…

job - DT

TRV job –

DT or DP

Don’t “oversell”

PICK THE RIGHT PUMP
FOR...
 John Barba
 Taco, Inc
 1160 Cranston Street
 Cranston, RI 02920
 Webiste: taco-hvac.com

 johbar@taco-hvac.com
 Tw...
Understanding & Designing Systems With Variable Speed Pumps
Understanding & Designing Systems With Variable Speed Pumps
Understanding & Designing Systems With Variable Speed Pumps
Understanding & Designing Systems With Variable Speed Pumps
Understanding & Designing Systems With Variable Speed Pumps
Understanding & Designing Systems With Variable Speed Pumps
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Understanding & Designing Systems With Variable Speed Pumps

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Presented at the 2014 HVAR & Mechanical Conference For Education Professionals, March 4, 2014 in Baltimore, MD

Published in: Technology
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Understanding & Designing Systems With Variable Speed Pumps

  1. 1. Understanding & Designing systems with variable speed pumps 3/4/2014 1
  2. 2. A LITTLE HISTORY LESSON… 3/4/2014 2
  3. 3. 1 9 68 3/4/2014 3
  4. 4. TYPICAL EUROPEAN SYSTEM Modulating TRV’s Pump runs 24/7 (6k hrs) Small pipe, wide ΔT Low flow, high head
  5. 5. TYPICAL US SYSTEM Series loop, fin-tube baseboard  CI bb/radiators/convectors  Radiant floor heating Multiple zones, circs or ZV’s Large pipe, low loads, 200 ΔT High flow, low head
  6. 6. STEEP CURVES VS. FLAT CURVES Flat curve = American curve Steep curve = European curve 3/4/2014 6
  7. 7. PUMP AFFINITY LAWS 2-4-8 Rule Double pump speed, flow  2X Double pump speed, head  4X Double pump speed, energy consumption  8X 3/4/2014 7
  8. 8. SO WHY USE A VARIABLE SPEED PUMP?
  9. 9. WHY USE A VARIABLE SPEED CIRCULATOR? Good question… Best applications… Zone valve or RFH Zone pump? Electrical savings?
  10. 10. ELECTRICAL SAVINGS???? 5 007’s @ 80W each = 400 Watts 400 Watts ÷ 1000 = 0.4 kW 0.4 kW × 2,200 “on” hrs = 880 kWh 880 kWh × 15¢/kWh = $132.00/yr
  11. 11. WITH ZONE VALVES… 1 007 (80W) + 5 Zone Sentry zone valve (1.44W each)= 87.2 Watts 87.2 Watts ÷ 1000 = 0.0872 kW 0.0872 kW × 2,200 “on” hrs = 192 kWh 192 kWh × 15¢/kWh = $28.80/yr
  12. 12. WITH SUPER DUPER ECM… 1 Pump (20W) + 5 Zone Sentries (1.44W each)= 27.2 Watts 27.2 Watts ÷ 1000 = 0.0272 kW 0.0272 kW × 2,200 “on” hrs = 60 kWh 60 kWh × 15¢/kWh = $9.00/yr
  13. 13. WHAT’S THE REAL COMPARISON? $132/yr vs. $9/yr? 93%!!! ≈ $17.50/mo $28.80/yr vs. $9/yr? 55% $2.80/mo 3/4/2014 13
  14. 14. D#^* THIS Traffic JAM! Design conditions All zones calling Max flow, least resistance 15
  15. 15. AS ZONES SATISFY… Less flow  flow resistance 3 lanes merge into 1 17
  16. 16. SYSTEM CURVES Hydronic “fingerprint” Unique for each system Where do they come from?
  17. 17. DO THE MATH, BABY! Need to calc system flow, head Head 1 ÷ Head 2 = (Flow 1 ÷ Flow 2)2 Easier way…
  18. 18. MAP IT OUT…
  19. 19. NOW ADD THE PUMP… Zone valves close Flow goes down Head pressure 007 Pump Curve goes up Energy In = Energy Out DP = Head  2.31 24 3/4/2014
  20. 20. 5 ZONE SYSTEM 70,000 BTUH 7 GPM @ 5’ head Where does system really work?
  21. 21. NUMBERS DON’T LIE… • GPM = BTUH DT × 500 • DT = BTUH GPM • DT = 70,000  500 9.5 • < 150  500
  22. 22. 1 ZONE CALLING 10,000 BTUH 1 GPM @ 5’ head Where does it really work?
  23. 23. NUMBERS STILL DON’T LIE… • GPM = BTUH DT × 500 • DT = BTUH  500 GPM • DT = 10,000  500 2 • 100
  24. 24. The Result? And when it’s 350 out?
  25. 25. 3/4/2014 31
  26. 26. 3/4/2014 32
  27. 27. SO BOTTOM LINE.. Zone valve FOR PETE’S SAKE… job - DT TRV job – DT or DP Don’t “oversell” PICK THE RIGHT PUMP FOR THE JOB!!! electrical savings! 3/4/2014 33
  28. 28.  John Barba  Taco, Inc  1160 Cranston Street  Cranston, RI 02920  Webiste: taco-hvac.com  johbar@taco-hvac.com  Twitter: @barbajo1  Blog: jbblog.flopro.taco-hvac.com 3/4/2014 34

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