Overview

Energy Saving VFDs

Reference

1] Overview

Little attention to Drive Application can provide a technical solution with huge saving of Energy and

Money

1] Overview

Using VFDFor Energy Saving

Advance Possibilities With VFDs

Overview

Energy Saving VFDs

Reference

2] Variable Frequency Drive

Energy Saving Principle by Drive Drive

Drive is a control equipment that controls motor speed efficiently as changing voltage and frequency of commercial power.

Input

230/40050HZ

OutputChanged voltage/frequency

Control amount of FAN’s wind as controlling motor speed

U

V

W

R/L1

S/L2

T/L3

Speed of Induction Motor

)1()1(120

SNsSP

fN

N: IM Speed (rev/min)f: Frequency (Hz)P: Quantity of PolesS: SlipNs: Synchronous Speed

The important factors for controlling speed are Frequency, Poles and Slip

Overview

Energy Saving VFDs

Reference

2] Variable Frequency Drive

Energy Saving Principle by Drive

Multiplication Decrease (VT: Variable Torque) HVAC Applications The application that its torque increases in direct proportion

to multiplication of speed Example : FAN, Pump, Blower

CT: Constant Torque The application that just needs constant torque

Example : Conveyor

CP: Constant Power The application that needs high torque at starting or low speed but does not need high torque at high speed

Example : Dehydrator, Electric saw

Torque

Speed

Torque

Torque

Speed

Speed

Characteristics of Torque depending on loads

Power

Overview

Energy Saving VFDs

Reference

2] Variable Frequency Drive

Energy Saving Principle by Drive

Characteristics of FAN, Pump HVAC Applications

The most huge Energy saving effect (Multiplication Decrease) They can be started within 100% of rated current by Soft start Protection for excessive pressure in pipes, Protection for water-leakage Decrease noise of Fan, Pump Characteristics of Fan, Pump, Blower can be composed of shaft power, air volume

and pressure by proportional expression

1) Air volume is in proportion to motor speed 2) Constant pressure is in proportion to multiplication of speed 3) Power is in proportion to the cube of motor speed

NQ

2NH

3NQHP

Overview

Energy Saving VFDs

Reference

2] Variable Frequency Drive

Energy Saving Principle by Drive

Compare Damper control with Drive controlPower

MM

Controller

FAN

Require

MeasureControl

DamperWind(Q)

Power

MM

FAN

Require

Measure

Damper

Motor

Wind(Q)

Drive

Motor

R1

(1)Q1Q2

A

BH1

H2

(1/2)

0

N=50%Revolution

Speed

R2

R1

Constant (H)Pressure

(1)Q1Q2

A

B

H1

H2

(1/2)

0

N=100% Revolution

Speed

N=100% Revolution

Speed

Constant (H)Pressure

Damper Control Drive Control

Air Volume(Q)

Air Volume(Q)

Overview

Energy Saving VFDs

Reference

2] Variable Frequency Drive

Energy Saving Principle by Drive

Calculate the amount of saved energy depending on the Motor SpeedP1: Power (Before installation of Drive)P2: Power (After installation of Drive)N1: The number of revolution of motor (Before installation of Drive) (50Hz)N2: The number of revolution of motor (After installation of Drive) (45Hz, 40Hz)

173.0150

451

1

22

33

PPPN

NP

%271

21Decrease of Ratio

P

P

Considering the efficiency of Drive and extra factor, 27% of energy on average will be saved at 45Hz

Operating at 45Hz

Overview

Energy Saving VFDs

Reference

3] Reference

Overview

Energy Saving VFDs

Reference

בצריכת 60%-30%לאחר ניסיון שצברנו בתעשייה הגענו לחיסכון של החשמל בעזרת ווסתי המהירות

צריכת החשמל ירדה משמעותית במיוחד בעזרת מערכת בחוג סגור, כלומר מתמרי לחץ ומתמרי

.טמפרטורה למיניהםדוגמא: התקנת ווסתי מהירות למשאבות וואקום עם מתמרי לחץ, צריכת החשמל ירדה בממוצע של מעל

. חום המנוע ירד גם הוא בצורה משמעותית60% .: התקנת ווסת למפוח אוויר וירידה בתדר מ- 2דוגמא

. ראוי לציין30% ירדה צריכת החשמל ב-45 ל- 50 .שספיקת האוויר לא נפגעה והייתה מספקת

בכל מקרה ,אחוז החיסכון במערכת בחוג סגור מושפע מכמות השימוש ושעות העבודה בעומס

.מלא ובעומס חלקי