| Subscribe for news
Apr
11th

NABERS Indoor Environment versus Energy Ratings

By Joe Scholz, Director, QED Environmental Services

Following on from my last post about cognitive effects of indoor environment, I’d like to provide some commentary on NABERS Indoor Environment versus Energy Ratings. This post derives from a second presentation I made to AIRAH’s 2017 Future of HVAC conference.

Certain highly energy efficient buildings are simultaneously hitting high NABERS IE ratings, for example:

 

Energy

Indoor Environment

100 St Georges Terrace Perth5.5 Star6 Star
QV1 Perth5 Star4.5 Star
50 Carrington St, Sydney 4.5 Star5 Star
50 Markus Clark5.5 Star5 Star

This contrasts with a common misconception that quality indoor environment will always require excessive ventilation with the associated high energy usage. There is an element of balancing energy and air quality – you shouldn’t manage for one and forget about the other. In this post I provide some tips for improving NABERS IE for a given energy rating.

Whilst ventilation is extremely important to the quality of indoor air, it is not the only factor driving NABERS IE ratings see the table below.

Overall 40% of the rating comes from thermal services and strong results from hourly monitoring is required for the higher NABERS IE ratings. Every non-compliance in hourly logs reduces the score.

See the following graph indicating that compliance of hourly logs above 95% is absolutely required to achieve a rating of 4 stars or more.

Another 40% of the rating is ventilation based, through once-off testing of carbon dioxide, particulates and carbon monoxide. In temperate and sub-tropical climates it is advisable to conduct the testing at the time of year that HVAC economy cycles are operational as this brings in more fresh air. In addition CO2 sensor accuracy and calibration should be checked along with managing the set points to avoid inconsistent CO2 conditions per floor.

In our experience measuring particulates across a large portfolio for over 10 years, the constant striving to improve the result, and willingness to make sensible investments in filtration, has seen impressive advance in conditions for occupants on this measure.

If you are interested to learn more about how air quality can improve the cognitive function and therefore productivity of employees watch the video below, or download our whitepaper: How indoor air quality can improve the cognitive function and productivity of building occupants

 


Recent Posts

The Impact of Indoor Environment Quality on Cognitive Function

13th Dec

As we head into 2022, a year marked by the great migration back to the office environment, there is much focus on indoor air quality. But ho...

COVID-19 Ventilation Optimisation: Guidelines for Australian Schools

07th Dec

Comprehensive guidelines for schools in Australia to mitigate the risk of transmitting COVID-19 through ventilation systems....

Ventilation in Schools, Kindergartens and Early Childcare Centres

13th Sep

Victorian authorities are reported to be considering ventilation monitors in schools....

View All
QED FEATURED ARTICLES

How IEQ Impacts Employee Productivity

We believe tenants should engage with landlords on the indoor environment quality with the same level of importance at which they consider the energy consumption of a building – it will improve their bottom line faster!

White Papers

December 13th 2021

The Impact of Indoor Environment Quality on Cognitive Function

As we head into 2022, a year marked by the great migrat...

September 07th 2021

Using Ventilation to Reduce the Covid-19 Infections within Hospitals

Using Ventilation to Reduce the Covid-19 Infections wit...

April 06th 2020

COVID-19 Cleaning & Cleaning efficacy

A simple guide on what you need to know about cleaning ...

View More

Latest News

December 07th 2021

COVID-19 Ventilation Optimisation: Guidelines for Australian Schools

Comprehensive guidelines for schools in Australia to mi...

September 13th 2021

Ventilation in Schools, Kindergartens and Early Childcare Centres

Victorian authorities are reported to be considering ve...

August 10th 2021

Sampling for cytotoxic drugs contamination in healthcare facilities

Our team recently conducted sampling for cytotoxic resi...

View More

Need more information? We’re here to help you...

Get in touch