“Coolbit” aims for personalised comfort advice in specific environments

An urban climatologist at UNSW Built Environment is part of a team developing a wearable Fitbit that can measure the wearer’s physiological response to their immediate environment.

UNSW Scientia Fellow Dr Negin Nazarian said the aim of Project Coolbit is to create a personalised comfort model for each wearer, as well as crowdsourcing environmental data in the city in real-time.

“We have added some sensors to the Fitbit watches that get information from air temperature and humidity, but also from the physiological response of the individual in that environment, such as your heart rate, your skin temperature, and your skin humidity,” said Nazarian.

“We have also developed some apps where you can interact with and tell us how you feel about the environment, so that way we can develop a methodology and a solution that is personalised and not one-size-fits-all.”

Nazarian is leading Project Coolbit together with National University of Singapore Assistant Professor Clayton Miller and the Fitbit Research Algorithm Team in San Francisco.

“This type of thermal comfort and stress feedback is traditionally done with formal and tedious surveys,” said Nazarian.

“With our app, we can control when, where and how often subtle comfort questions are asked.”

Nazarian said that in the future, a Coolbit user could create a personalised heat safe route for a run, based on the previous information received by the wearable. 

“So if your wearable already knows your personal comfort model, it knows your preference of the environment, the type of activities you like and some information about your physiological response,” the urban climatologist said.

“It also knows, based on the environmental information that other parties may give about the cities, the climate of the city.

“Then it can recommend to you a route that would be heat safe where you can do a certain activity, such as running, or it may tell you that it’s not safe to run.”

Project Coolbit came about after Nazarian experienced shortcomings with previous methodologies that modelled the environment.

“Previously I was using methodologies such as numerical modelling, where you simulate the climate and thermal comfort and evaluate how that gets modified by urban design and materials, or I was putting a sensor in a location and noting all the environmental factors and asking participants questions about how they feel about that location.

“But they’re very limited in the location and the timing that they can cover … you can’t always be everywhere with your sensors and they don’t have the physiological and personal behavioural aspects of thermal comfort.”

She then considered having a sensor that spans a larger space, but also gives information about the person who is carrying it, resulting in “a more realistic and human-centric approach”.

Nazarian’s research was motivated by the impact of climate change on human lives.

“One of the main challenges of urban climate is urban overheating.

“All around the world, urban areas are hotter than the less developed and rural areas surrounding them.

“On top of that, extreme events led by climate change, such as heatwaves, are affecting the health and economy in cities around the world.”

Nazarian is interested in how climate change is affecting human health as well as the economy.

“In my research, I try to look at various aspects of urban design, different materials that are used to build the environment around us, as well as the use of or lack of greenery in the cities, and consider how that forms and shapes the climate around us.

“How does that affect our day-to-day activities, and where can we use this information to inform adaptation and mitigation strategies for addressing the challenges of climate change?”