Production introduction

E5-P and E5-H series high performance vector control inverter is a special-purposed adjustable speed motor drive for fan and pump, combining application features in fan industry. The products is widely used for many industrial fields such as fire fighting, petrochemical, metallurgy, mine, pharmacy, paper-making, spinning, building material, transportation, etc., and civil projects, such as centralized air conditioner, etc. for the purpose of improving technique and efficiency. The good energy conservation effect can be reached for load like fan. The product can completely supersede import product, and produce significant social and economic benefits.

Industrial type selection and industrial advantages

2.1 Industrial type selection

Most fan loads are light-load equipment and the ratio of E5-P to motor power rating is 1:1. Other loads like Roots fan, contra-rotating fan, and induced draft fan are heavy-load equipment, and the ratio of E5-H to motor power rating is 1:1.

2.2 Industrial advantages:

3. System connection diagram

4. Electricity saving rate calculation and type selection

◆ According to the fundamental law of fluid mechanics, the equipment like fan and pump are of square torque loads, which speed n, quantity of flow Q, pressure H and shaft power P have the following relations:

Q∝n, H∝n2 and P∝n3; Which means that the quantity of flow is proportional to speed, pressure is proportional to square speed, and shaft power is proportional to the cubic speed.

◆ Energy calculation example 1:

1. In a steel company, there is a centrifugal pump, with rated flow of 200.16m3/h, lift of 50m, which is equipped with a motor with rated power of 45kW. According to the operation requirement, the water pump continuously runs for 24 hours per day, and runs at 90% of load for 11 hours per day, and at 50% of load for 13 hours per day. The pump annually runs for 300 days.

The power saving amount per year is:

△P1=45×11×（100%－69%）×300=46035kW·h

△P2=45×13×（95%－20%）×300=131625 kW·h

△P=△ P1＋△ P2=46035＋131625=177660 kW·h

Based on the price of 0.5 ￥/kWh, the annual saved electric charge is 88,830 ￥.

According to square torque and load relational expression for equipment like fan and pump: P/P0=（n/n0）3, where P0 is rated power at rated speed n0; P is the power at speed n.

Energy calculation example 2:

2. In a heating company, there is an industrial boiler using a 22kW air blower. The working condition is also that the air blower continuously runs for 24 hours per day, and runs at 90% of load for 11 hours per day (the frequency is 46Hz, and power consumption of motor is 98% when damper adjustment), and at 50% of load for 13 hours per day (the frequency is 20Hz, and power consumption of motor is 70% when damper adjustment). The pump annually runs for 300 days. The annual power saving amount of frequency converter is:

W1=22×11×[1－（46/50）3]×300=16067kW•h

W2=22×13×[1－（20/50）3]×300=80309kW•h

Wb=W1＋W2=16067＋80309=96376kW•h

Power saving amount at damper adjustment is:

W1=22×（1－98%）×11×300=1452kW•h

W2=22×（1－70%）×11×300=21780kW•h

Wd=W1＋W2=1452＋21780=23232kW•h

The compared power saving amount is:

W=Wb－Wd=96376－23232=73144kW•h

Based on the price of 0.5 Yuan/kWh, the annual saved electric charge is 36,570 Yuan.

By contrast, the power saving amount at frequency converter adjustment within 1 day is 275.1kW•h more than that at valve adjustment, with power saving rate up to 42.1%.