Energy & Water Audit

An energy & water audit is a survey and analysis of energy and water systems and their consumption in a building, to reduce the energy consumption while maintaining or improving human comfort, health and safety levels. An energy & water audit is the first step in identifying opportunities to reduce energy & water expenses and carbon footprints. It is also an important component of a Sustainability Assessment.

An energy & water audit typically consists of:

The analysis of a building and utility data, and analysis of energy & water bills.
The analysis of the installed building, energy and water systems and equipment.
A survey of the building operating conditions.
A study of the impact of weather, occupancy and operating schedules.
The selection and the evaluation of energy & water conservation measures.
The estimation of energy & water savings potential.
The identification of customer concerns and needs.
Generally, four levels of analysis can be performed.

Level 0 – Benchmarking: This first analysis consists in a preliminary analysis based on the analysis of the historic utility use and costs and the comparison of the performances of the buildings to those of similar buildings.

Level I – Walk-through audit: Preliminary analysis made to assess building energy & water efficiency to identify simple and low-cost improvements and energy & water conservation measures (EWCM) to orient the future detailed audit. This inspection is based on visual verifications, study of installed equipment and operating data and detailed analysis of recorded energy consumption collected during the benchmarking phase.

Level II – Detailed/General energy audit: Based on the results of the pre-audit, this type of energy audit consists in energy & water use survey in order to provide a comprehensive analysis of the studied installation, a more detailed analysis of the facility, a breakdown of the energy & water use and a first quantitative evaluation of the EWCMs selected to correct the defects or improve the existing installations.

Level III – Investment-Grade audit: Detailed Analysis of Capital-Intensive Modifications focusing on potential costly EWCMs requiring rigorous engineering study. This level of analysis can involve advanced on-site measurements and sophisticated computer aided simulation tools to evaluate the selected energy retrofits.