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Estimating energy consumption by purpose and analyse standby power in non-residential buildings in Japan

Panel: 5. Buildings and construction technologies and systems

This is a peer-reviewed paper.

Authors:
Takuo Yamaguchi, Bizen Green-Energy Inc., Japan
Yumiko Iwafune, Collaborative Research Center for Energy Engineering, Institute of Industrial Science, The University of Tokyo, Japan

Abstract

The purpose of the study is to support energy saving endeavors in small and medium-sized non-residential buildings. The study measures the energy consumption of 18 non-residential buildings in detail, and develops an estimation method of their energy consumption by purpose. This study also analyse the measured data, and finds that standby power accounts for a large part of electricity.

Measuring the energy consumption of each purpose is very expensive. So, the study developed the estimation method that uses commonly available data, such as monthly energy consumption, to estimate energy consumption by purpose at a low cost. The study measures the energy consumption of each purpose, analyses these data, and develops the method.

The method separates building energy consumption into AC, domestic hot water, lighting, cooking, transformer loss, and other devices. The difference between the estimated consumption of each purpose and the measured consumption can be as high as 17%. The estimated value of each purpose is close to the actual consumption, and the method can show the energy consumption of each purpose with a low cost.

The study analyses the standby power of two buildings by using the measured electricity consumption data in detail. In this study, standby power consumption is defined as electricity consumption that is consumed despite a not-warking day. The electricity consumption, which is not considered to be standby power consumption such as consumption by a computer server and an Emergency Power Supply (EPS), is carefully removed, but the electricity consumption of vending machines and the emergency exit signs is included. This study finds that standby power accounts for a large part of electricity consumption in a non-residential building. The standby power accounts for 14% to 20% of electricity consumption in a non-residential building. Further analysis is necessary to know the actual state of standby power in a non-residential building.

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