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1. New Procedure for Estimating Seasonal Energy Efficiency Ratio of Chillers.

Author

Shimoda, Yoshiyuki, Choonchuachan, Nattapon, and Mizuno, Minoru

Subjects
*ENERGY consumption, *WATER temperature, *AIR conditioning, *COOLING, *WEATHER, *WET-bulb thermometers, *COMPRESSORS
Abstract

This paper proposes a new index of the seasonal energy efficiency for chillers. The new index, the CSE (chiller seasonal efficiency) index, can be used by building designers for specifying the required chiller performance to manufacturers. This index has an advantage in that it is adaptable to multiple-chiller systems by setting six rating points to consider the difference in the COP due to the entering condenser water temperature as well as the part load. In addition, the use of the weighted harmonic mean equation improves the accuracy in predicting the seasonal COP In this paper, the rating condition for the CSE index is determined from the cooling load profile of office buildings in Japan. Using the CSE index, the advantage ofa variable-speed compressor chiller is presented. In the final part of the paper, the effect of the difference in chiller sequence control is discussed. [ABSTRACT FROM AUTHOR]

Published
2007

2. The Identification and Rebound Effect Evaluation of Equipment Energy Efficiency Improvement Policy: A Case Study on Japan's Top Runner Policy.

Author

Yu, Dan, Dewancker, Bart, and Qian, Fanyue

Subjects
*ENERGY consumption, *ENERGY conservation, *REDUCTION potential, *AIR conditioning, *CASE studies, *AUTOMOBILE lighting
Abstract

The equipment energy efficiency improvement policy (EEEIP) is one of the important measures of energy conservation and emission reduction in various countries. However, due to the simultaneous implementation of variety policies, the effect of the single policy cannot be clearly reflected. In this paper, a method of identification and evaluation of EEEIP was proposed, and the application was verified by analyzing the example of EEEIP in Japan (Top Runner policy, TRP). Firstly, through the factor decomposition model, this paper studied the energy conservation and emission reduction potential of this policy area in Japan. Then, the TRP was identified by using moving windows and correlation analysis, and the impact of specific equipment in TRP was analyzed. Finally, through the calculation of the rebound effect of the carbon footprint (REC), this paper analyzed the energy consumption and emission reduction effects of TRP in the short-term and whole life cycle. It showed that the policy has a good effect in tertiary industry and transportation, while the effect in residential is poor. For life cycle, the TRP of air conditioning and passenger car can bring better CO2 emission reduction effect, but the emission reduction effect of lighting is basically offset. [ABSTRACT FROM AUTHOR]

Published
2020
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