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# How to calculate the energy consumption reduced by the inverter energy saving transformation?

Dec 09, 2020

How to calculate the energy consumption reduced by the inverter energy saving transformation?

Preface: How to measure and verify the energy saving of the inverter in the actual application of energy saving transformation? How to let enterprise users understand the economic benefits of energy-saving transformation to reduce energy consumption.

First of all, we must understand a concept: what is the measurement and verification of energy savings? Measurement and verification activities are mainly carried out for energy consumption facilities and equipment. Measurement and verification is a complete set of methods to record and analyze the energy consumption patterns and quantities before and after energy-saving transformation, and compare relevant data to determine the amount of energy reduction brought about by the transformation, that is, the energy-saving amount. The mainstream measurement and verification procedures at home and abroad include: IPMVP ASHRAE and China GBT 28750, etc., which evolved through a long historical process.

Energy saving is energy that is not consumed. Then the question arises. How can we measure things that are not consumed? The answer is that we can only measure energy consumption, and determine the energy savings by comparing and analyzing the energy consumption before and after the transformation! which is:

Energy saving = energy consumption in the reference period-energy consumption in the reporting period ± adjustment amount

Next, we have to choose the correct method of inverter energy-saving M&V. There are four options ABCD for selection, and there are transformation isolation method and overall facility method. Since the main energy consumption of duct fans is reflected in the form of electrical energy, energy saving is not beyond the measurement boundary The change factors are affected and the adjustment is simple. It is necessary to install a new measuring instrument—smart meter. We choose A—to transform the isolation method, measure the key parameters, and multiply it by the corresponding electricity price to get the saved electricity bill.

Option A method

Base period measurement

200kW

Reporting period measurement

150kW

Estimated running time

200hrs

Avoided energy consumption

50kW x 200hrs = 10000kWh

When selecting B-reform isolation mode, measure all parameters.

Option B method

Base period measurement

40000kWh

Reporting period measurement

30000kWh

Avoided energy consumption

10000kWh

A can reduce the measurement cost, but it will bring uncertainty to the measurement result.

How to determine the isolation boundary? The purpose of setting the isolation boundary is to define the content and scope of the measurement. At the same time, the measurement time must be set. Methods C and D are to measure all the effects within the boundary of the overall facility, and D is to "manufacture" the reference period data through simulation without the reference period data. C and D are suitable for energy bill analysis and building load simulation respectively.

Option A

One-time measurement after installation. Example: Lighting and water saving renovation.

Option B

Similar to option A, except that continuous and periodic measurements are required. Example: Energy saving of chiller replacement and start/stop control.

Option C

Energy bill analysis. It is suitable for the simultaneous use of multiple independent energy-saving measures. Example: Reduction of heat load due to lighting renovation. SRC's Metrix software analyzes multivariate regression analysis using actual energy bill data

Option D

Building load simulation. Example: Central heating station. Computer simulation of base year, correction of base year energy bills or measured data, modeling of proposed retrofits

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