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
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Next, let's discuss package managers. Package managers play a critical role in the OSS ecosystem. I'll explain how to manage library dependencies in your application.
I'll share insights into how the Ruby and RubyGems core team works to keep our ecosystem safe. By the end of this talk, you'll have a better understanding of how to safeguard your code.
Digital Banking in the Cloud: How Citizens Bank Unlocked Their Mainframe
Inconsistent user experience and siloed data, high costs, and changing customer expectations – Citizens Bank was experiencing these challenges while it was attempting to deliver a superior digital banking experience for its clients. Its core banking applications run on the mainframe and Citizens was using legacy utilities to get the critical mainframe data to feed customer-facing channels, like call centers, web, and mobile. Ultimately, this led to higher operating costs (MIPS), delayed response times, and longer time to market.
Ever-changing customer expectations demand more modern digital experiences, and the bank needed to find a solution that could provide real-time data to its customer channels with low latency and operating costs. Join this session to learn how Citizens is leveraging Precisely to replicate mainframe data to its customer channels and deliver on their “modern digital bank” experiences.
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Understanding & Designing Systems With Variable Speed Pumps
- 1. Understanding & Designing systems with variable speed pumps 3/4/2014 1
- 2. A LITTLE HISTORY LESSON… 3/4/2014 2
- 4. TYPICAL EUROPEAN SYSTEM Modulating TRV’s Pump runs 24/7 (6k hrs) Small pipe, wide ΔT Low flow, high head
- 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. STEEP CURVES VS. FLAT CURVES Flat curve = American curve Steep curve = European curve 3/4/2014 6
- 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. SO WHY USE A VARIABLE SPEED PUMP?
- 9. WHY USE A VARIABLE SPEED CIRCULATOR? Good question… Best applications… Zone valve or RFH Zone pump? Electrical savings?
- 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. 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. 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. 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
- 15. D#^* THIS Traffic JAM! Design conditions All zones calling Max flow, least resistance 15
- 17. AS ZONES SATISFY… Less flow flow resistance 3 lanes merge into 1 17
- 19. SYSTEM CURVES Hydronic “fingerprint” Unique for each system Where do they come from?
- 20. DO THE MATH, BABY! Need to calc system flow, head Head 1 ÷ Head 2 = (Flow 1 ÷ Flow 2)2 Easier way…
- 23. MAP IT OUT…
- 24. 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
- 25. 5 ZONE SYSTEM 70,000 BTUH 7 GPM @ 5’ head Where does system really work?
- 26. NUMBERS DON’T LIE… • GPM = BTUH DT × 500 • DT = BTUH GPM • DT = 70,000 500 9.5 • < 150 500
- 27. 1 ZONE CALLING 10,000 BTUH 1 GPM @ 5’ head Where does it really work?
- 28. NUMBERS STILL DON’T LIE… • GPM = BTUH DT × 500 • DT = BTUH 500 GPM • DT = 10,000 500 2 • 100
- 29. The Result? And when it’s 350 out?
- 31. 3/4/2014 31
- 32. 3/4/2014 32
- 33. 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
- 34. 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