As advocates of renewable energy, we talk a lot about building new wind, solar or bio-fuel facilities to help reduce our co2 footprint and maybe influence the current path for global climate change ( yes it is real…). Many countries are actively replacing aging power plants.
In fact there is a first step that should be completed before switching to renewable energy ( such as the biggest wind farm in the USA being done by GE ), and that is using energy more responsibly. Another way to say this is first let’s work on energy efficiency.
One of the largest consumers of electricity is air conditioning, especially the older units even so the most energy units on the market are energy hogs. There are still so many areas around the world with an estimated 100 million people that do not have electricity let alone air conditioning. As more people move from poverty to the middle class the demand for air conditioning will rise with it.
By implementing energy efficiency measures and by replacing older energy consuming devices like AC units we could reduce the electricity loads equivalent to many coal or gas generators. The best power plant is the power plant that we did not have to build.
A team of researchers from the National University of Singapore (NUS) has pioneered a new water-based air-conditioning system that cools air to as low as 18 degrees Celsius without the use of energy-intensive compressors and environmentally harmful chemical refrigerants.
This game-changing technology could potentially replace the century-old air-cooling principle that is still being used in our modern-day air-conditioners. Suitable for both indoor and outdoor use, the novel system is portable and it can also be customized for all types of weather conditions.
Researchers from the Department of Mechanical Engineering at National University of Singapore’s Faculty of Engineering developed a novel water-based, eco-friendly and energy-saving air-conditioner. Seated: (From left to right) Dr Md Raisul Islam and Associate Professor Ernest Chua Back row: (From left to right) Dr M Kum Ja and Dr Bui Duc Thuan CREDIT National University of Singapore
Led by Associate Professor Ernest Chua from the Department of Mechanical Engineering at NUS Faculty of Engineering, the team’s novel air-conditioning system is cost-effective to produce, and it is also more eco-friendly and sustainable. The system consumes about 40 per cent less electricity than current compressor-based air-conditioners used in homes and commercial buildings. This translates into more than 40 per cent reduction in carbon emissions. In addition, it adopts a water-based cooling technology instead of using chemical refrigerants such as chlorofluorocarbon and hydrochlorofluorocarbon for cooling, thus making it safer and more environmentally-friendly.
To add another feather to its eco-friendliness cap, the novel system generates potable drinking water while it cools ambient air.
Assoc Prof Chua said,
For buildings located in the tropics, more than 40 per cent of the building’s energy consumption is attributed to air-conditioning. We expect this rate to increase dramatically, adding an extra punch to global warming. First invented by Willis Carrier in 1902, vapour compression air-conditioning is the most widely used air-conditioning technology today.
This approach is very energy-intensive and environmentally harmful. In contrast, our novel membrane and water-based cooling technology is very eco-friendly – it can provide cool and dry air without using a compressor and chemical refrigerants. This is a new starting point for the next generation of air-conditioners, and our technology has immense potential to disrupt how air-conditioning has traditionally been provided.
Innovative membrane and water-based cooling technology
A Typical Refrigeration Cycle Today.
Current air-conditioning systems require a large amount of energy to remove moisture and to cool the dehumidified air. By developing two systems to perform these two processes separately, the NUS Engineering team can better control each process and hence achieve greater energy efficiency.
The novel air-conditioning system first uses an innovative membrane technology which is a paper-like material to remove moisture from humid outdoor air. The dehumidified air is then cooled via a dew-point cooling system that uses water as the cooling medium instead of harmful chemical refrigerants. Unlike vapour compression air-conditioners, the novel system does not release hot air to the environment. Instead, a cool air stream that is comparatively less humid than environmental humidity is discharged – negating the effect of micro-climate. About 12 to 15 litres of potable drinking water can also be harvested after operating the air-conditioning system for a day.
Assoc Prof Chua, explained further:
Our cooling technology can be easily tailored for all types of weather conditions, from humid climate in the tropics to arid climate in the deserts. While it can be used for indoor living and commercial spaces, it can also be easily scaled up to provide air-conditioning for clusters of buildings in an energy-efficient manner. This novel technology is also highly suitable for confined spaces such as bomb shelters or bunkers, where removing moisture from the air is critical for human comfort, as well as for sustainable operation of delicate equipment in areas such as field hospitals, armored personnel carriers, and operation decks of navy ships as well as aircraft.
The research team is currently refining the design of the air-conditioning system to further improve its user-friendliness. The NUS researchers are also working to incorporate smart features such as pre-programmed thermal settings based on human occupancy and real-time tracking of its energy efficiency. The team hopes to work with industry partners to commercialize the technology.
Researchers from the Department of Mechanical Engineering at National University of Singapore’s Faculty of Engineering developed a novel water-based, eco-friendly and energy-saving air-conditioner. Seated: (From left to right) Dr Md Raisul Islam and Associate Professor Ernest Chua Back row: (From left to right) Dr M Kum Ja and Dr Bui Duc Thuan
National University of Singapore
More thoughts on energy efficiency. If we can develop more devices that use far less energy like we did with LED lighting and now air conditioning we may not need a power plant to be built at all. But if we do lets make it a renewable one. ( with energy storage)
About Gordon Smith Gordon's expertise in the area of industrial energy efficiency and alternative energy. He is an experienced electrical engineer with a Masters degree in Alternative Energy technology. He is the co-founder of several renewable energy media sites including Solar Thermal Magazine.