Splitting measurements of the total heat demand in a hotel into domestic hot water and space heating heat use

Dmytro Ivanko,Åse Lekang Sørensen,Natasa Nord

doi:10.1016/j.energy.2020.119685

Abstract

To achieve more efficient energy use in buildings, space heating (SH) and domestic hot water (DHW) heat use should be analysed separately. Unfortunately, in many buildings, the heat meters measure the total heat use only, typically not divided into SH and DHW. This article presented a method for splitting the total heat use into the SH and the DHW. The splitting follows the assumption that the outdoor temperature is the main parameter explaining the hourly SH heat use, while the hourly DHW heat use is not influenced by this parameter. In the article, the modelled SH heat use was extracted from the total heat use based on the energy signature curve and the singular spectrum analysis. Thereafter, from the residuals between the modelled SH heat use and the total heat use, the DHW heat use was identified. The application of the method for the hotel in Norway showed that restored values represented the trends of the measured SH and DHW heat use well. The coefficient of determination (R2) for the modelled SH heat use was 0.97, and 0.76 for DHW. The methodology is useful for obtaining valuable information for monitoring and improving the energy performance of SH and DHW systems.

Highlights

For the European Union (EU) power system, energy savings in buildings is a vital topic
The literature review shows that the problem of dividing the total heat use into the parts related to the space heating (SH) and domestic hot water (DHW) is not solved yet, especially for larger buildings with limited knowledge about the users
Analysis of the SH and the DHW heat use based on the energy signature curve

Summary

Introduction

For the European Union (EU) power system, energy savings in buildings is a vital topic. This topic is important from both an economic and environmental perspective [1]. The amount of energy use in buildings is currently reaching 40% of the total energy use [2]. Out of all the technical systems in buildings in the EU, space heating (SH) and domestic hot water (DHW) are often the most significant consumers of energy. [3], SH and DHW heat use together accounts for more than 20% of the total EU energy utilisation. Increasing energy efficiency in SH and DHW systems is essential for attaining the EU energy targets [4]

Methods

Results

Conclusion