Daniel Mancin, Market Development Manager, HVAC & Energy

Transcription

1 AIRAH VICTORIA PRESENTATION, MAY 2013 Energy Savings attainable by the implementation of Variable Speed Drives Daniel Mancin, Market Development Manager, HVAC & Energy ABB Group May 23, 2013 Slide 1

2 THE ENERGY DILEMMA If the World demand for non-renewable fossil fuels continues at the current rate, our existing resources will be exhausted in a relatively short time. Increasing levels of Carbon Dioxide are leading to atmospheric warming and associated changes to our environment. Although new, clean sources of energy are being investigated, they will not be viable for some time.

3 TAKING ACTION In the short to mid term, Industry, commerce and society in general needs to consider current products and technologies that can reduce our energy usage quickly and cost effectively. Variable Speed Drives (VSD) are a device that can dramatically reduce absorbed energy on given applications with minimal cutting in and downtime. ABB Group May 23, 2013 Slide 3

4 THE ABB AC VARIABLE SPEED DRIVE RANGE MV INDUSTRIAL DRIVES ACS1000 ACS5000 ACS6000 LCI. SO / ST 0.3 to 5.0 MW 1.7 to 24.0 MW 3.0 to 27.0 MW 4.0 to MW INDUSTRIAL DRIVES ACS to 5,600 KW - LV & MV - LOW HARMONIC DRIVES - REGENERATIVE DRIVES - DRIVE MODULES, - SINGLE DRIVES, - MULTI-DRIVES HVAC DEDICATED DRIVES ACH KW MACHINERY DRIVES ACS350 ACSM to 45 KW COMPONENT DRIVES ACS55 ACS to 4 KW STANDARD DRIVES ACS to 355 KW

5 ENERGY OPTIMIZATION LOAD TYPES It is necessary to determine the type of load ie load characteristic thereby confirming likely energy saving potential! The two basic load types are: - Constant Torque - Variable Torque (Quadratic Load) - Laws of Affinity applicable - Q = Flow - Q1/Q2 = N1/N2 H1/H2 = (N1/N2) 2 P1/P2 = (N1/N2) 3 N = Speed P = Power H = Pressure

6 LOAD PROFILES Variable / Quadratic Torque P = T x w Constant Torque

7 SYSTEMS KNOWLEDGE A clear and full understanding of existing system / plant operation is of paramount importance, governing factors include: What are the operating pressures of the system? (Industrial boiler feed systems) Is the system inheritantly quadratic / constant torque or something in between? Is the system suitable for VSD control? An example of this would be is the design intent of system based on static pressure or velocity pressure! Are the losses in system frictional or head (lift) or combination of both? Is the system an open or closed system Is the reduced running speed (and hence energy saving) known or can it be determined by a trial? Is there a single pump in system or varying multiples in parallel? Will equipment resonance occur within desired speed regulation range? Ramifications of incorporating VSDs into system, i.e. DX systems, oil lubrication, minimum motor speeds etc?

8 CONTROL METHODS To enable and maximise the energy savings attainable through the use of VSDs to be realized, it is of equal importance to carefully consider the VSD control method(s) used, considerations include: What do we want to measure? Flow, pressure, temperature, parts per million(ppm), velocity etc. OR a combination. Location of sensor(s) in system. Number of sensors in system. Utilization of full bore flowmeters. Will preset speed drop offs (digital) suffice OR will infinite (analogue) speed adjustment be required. Set and forget. Local manual speed adjustment via keypad on VSD

9 FACTORS INFLUENCING ENERGY SAVING POTENTIAL Load type Overdesign / parallel pumping / load profile Running hours Cost of electricity Motor size / running current

10 PRIMARY PUMPING

11 PRIMARY / SECONDARY SYSTEMS

12 Constant Air Volume System (CAV)

13 Typical centrifugal pump curve

14 VSD operation overlay

15 VSD operation overlay

16 VSD IMPLEMENTATION CONSIDERATIONS EMC (Electromagnetic compatibility) also known as RFI (Radio Frequency Interference) AS Harmonics AS61000 Motor windings insulation quality Motor minimum operating speed Bearing Currents Motor cable length / Sinusoidal filters IP ratings Starting Current load Running current Vs motor nameplate current Hardwired Interface / High Level Interface Multiple Motors ABB Group May 23, 2013 Slide 16

17 Summary As we have seen, there is a diverse range of applications where the many benefits of implementing Variable Speed Drives can be realized. Should you wish to discuss / ascertain likely benefits to your specific plant, feel free to contact: Daniel Mancin Market Development Manager HVAC, Water and Energy Mobile: Phone: Fax: daniel.mancin@au.abb.com

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