Clean thermal energy for clean fresh water

February 18, 2015, RMIT University
Thermal Water Pump. Credit: RMIT University

RMIT's Dr Abhijit Date was awarded the $AUD132,000 grant for his research into a sustainable and economical fresh water management system that could be used in coastal areas of India and salt-affected farming land in Australia.

The system uses a special thermal pump developed at RMIT and the University of Pune, India, which is driven by low-temperature thermal energy rather than grid electricity.

"There are many poor in India where access to is an issue but they cannot afford to use standard power-hungry desalination and irrigation systems," Dr Date said.

"The desal and we are developing is both cheap to run and sustainable, producing no greenhouse emissions.

"Not only could this system help many coastal communities, it could also enable saline groundwater to be turned into fresh water and used for agricultural irrigation – helping farmers in Australia and across the world."

The sustainable system runs on clean power sources – such as solar thermal, geothermal or waste heat – and generates both fresh water and water pumping power using thermal energy at temperatures below 100C.

Researchers have built a lab-scale prototype of the thermal water pump system, with early tests showing the system can produce 1000L of fresh water from 2000L of saline feed water with a salt concentration between 5000-15,000 grams per cubic metres.

The system works by boiling a refrigerant at constant temperature and using the pressurised refrigerant vapour to power a piston and pump water out. To suck water in, the vapour is cooled down, reducing the volume, pushing the piston in the opposite direction.

"The success of this project will provide a much needed alternative system that can be manufactured in Australia and provide opportunity for industry development, employment creation and export," Dr Date said.

Explore further: Research makes desalination cheaper and greener

Related Stories

Using solar energy to improve desalination process

February 4, 2015

An Aston University academic has proposed a new process to decompose waste desalination brine using solar energy, neutralising ocean acidity and reducing damaging environmental impacts.

A novel solar CPV/CSP hybrid system proposed

February 11, 2015

In concentrating photovoltaic (CPV) systems only a small part of the incident solar energy can be converted into electricity and the majority of the incident energy is dissipated as waste heat. Although the waste heat could ...

Recommended for you

Earth's deep mantle flows dynamically

March 25, 2019

As ancient ocean floors plunge over 1,000 km into the Earth's deep interior, they cause hot rock in the lower mantle to flow much more dynamically than previously thought, finds a new UCL-led study.

Scientists solve mystery shrouding oldest animal fossils

March 25, 2019

Scientists from The Australian National University (ANU) have discovered that 558 million-year-old Dickinsonia fossils do not reveal all of the features of the earliest known animals, which potentially had mouths and guts.

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.