06 December 2017
The work in IEA HPT Annex 44 “Performance Indicators for energy efficient supermarket buildings” has been focused on finding average values for the energy consumption of supermarket buildings, using easily available performance indicators. This information can be used by policy makers and researchers to set a reference for average supermarket energy consumption. It can also be used by supermarket owners to compare the energy consumption of a specific supermarket to the average consumption, and thus determine whether the specific supermarket is energy efficient or not.
A supermarket is energy efficient when its total energy consumption is below 400 kWh/m2.year compared to supermarkets from Denmark, Sweden and The Netherlands. The area (m2) referred to is the total supermarket area.
400 kWh/m2.year is the average energy intensity found for supermarkets in Denmark, Sweden and The Netherlands, with an average total area of 1360 m2 and 73 opening hours per week. Corrections are presented for differences in size and opening hours.
Based on the available measured data no relation could be found between the total energy consumption (heat & electricity) and the geographic region of the supermarkets; additional computer modelling in this case also did not provide such a relation.
Developments, especially in refrigeration systems and lighting, lead to an increase of energy efficiency in new or refurbished supermarkets ranging from 1 – 10 % per year. Refurbishment therefore is an effective management decision to increase energy efficiency.