CHZIRI Frequency Converter Energy saving for Heating System

Transformation effect

The transformation of heating system in domestic

1PC CHZIRI VFD 90KW as an example

1. Data before transformation

U=380V  I=160A  cosΦ=0.887
P=1.732UIcosΦ
=1.732×380×160×0.887
=93.4KW
Electricity cost each year before transformation (each year is counted as 100 days)
93.4KW×24×100=224160 kilowatt hour

2. Data after transformation
U=380  I=100A  cosΦ=0.98
P=1.732×380×100×0.98=64.5KW
Electricity cost each year after transformation （each year is counted as 100 days）
64.5KW×24×100=154800 kilowatt hour

3.Electricity conservation each year after transformation：
224160－154800=69360 kilowatt hour
Electricity conservation rate：69360÷224160=30%
Power cost saving each year (0.1USD per kilowatt hour )：
69360×0.6=41616 yuan  (5950.00USD)
you can save the cost $5950.00 for one year.

In the China northern, circulated hot water heating is normally used. So there is water-delivery pump on the front part of heating pipe and there is backwater pump at the end of heating pipe. Water-delivery pump delivers water that has been heated at a specific temperature into the pipe. Backwater pump delivers water that has released thermal energy back to boiler to be reheated.

Heating deign usually calculate water supply according to local extreme climate conditions. However, in fact, there is only an extremely short period each time when maximum water supply appears. Therefore, at the most of time, the system is working under the condition that is much less than rated capacity. According to statistics, the actual capacity of the system is only 60% of the system rated capacity. So this causes a huge waste. Moreover, the system constantly keeps working at a very high speed. This will lead to serious mechanical wear, equipment breakdown and shorter operation life.