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Scientists from Hong Kong have announced a promising advance in the development of an air conditioner that works without refrigerant fluids. The technology could revolutionize the industry by reducing costs, increasing efficiency, and decreasing environmental impacts, making cooling more sustainable.
Scientists from Hong Kong have announced a promising advance in the development of an air conditioning system that eliminates the need for refrigerant fluids, reducing environmental impacts and energy consumption.
The electricity consumption in buildings is constantly growing, and air conditioning systems represent a significant portion of that expenditure.
With global warming, the demand for cooling increases, making it essential to seek more sustainable alternatives.
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In addition to high energy consumption, conventional units use refrigerant fluids that are harmful to the environment.
A new technology may change this scenario. Researchers from the Hong Kong University of Science and Technology (HKUST) have announced an advance in the development of an elastocaloric air conditioner, which dispenses with the use of refrigerant fluids.
This system utilizes a thermomechanical effect that causes a temperature variation when a material is subjected to mechanical stress.
Significant Advance in Technology
Developing an efficient cooling system based on this effect has always been a challenge.
Most previous prototypes failed to exceed the kilowatt scale, making it unfeasible for use in larger settings.
The HKUST team, led by professors Sun Qingping and Yao Shuhuai, has managed to overcome this limitation.
The new cooling system developed by the scientists is capable of cooling an entire room with high efficiency.
The study was published in the journal Nature Energy and highlights how this innovation can transform the HVAC industry and contribute to reducing carbon emissions.
The result is the fruit of years of research and refinement of the technology.
Innovative Architecture
The researchers have managed to overcome challenges that previously limited the efficiency of elastocaloric systems.
The main obstacle was balancing cooling power with the amount of active material used.
Additionally, heat transfer was often inefficient at higher operating frequencies.
To address these issues, the team developed a multicellular design. This model consists of connecting about ten elastocaloric cooling units.
Each unit is composed of four thin-walled nickel-titanium alloy tubes. These ultra-light tubes improve heat exchange, making the system more efficient.
Another innovation was replacing distilled water with a graphene nanofluid. This material further enhances heat conduction and increases the performance of the equipment.
In tests, the device achieved a specific cooling power of 12.3 W/g at a frequency of 3.5 Hz. The total power exceeded 1 kW, reaching 1284 watts, an unprecedented achievement for this technology.
Promising Results
During the experiments, the equipment managed to cool a room of 2.3 m³. The ambient temperature dropped to 21-22°C in just 15 minutes, while the outside temperature varied between 30-31°C. This result demonstrates the system’s potential for real-scale use.
According to Sun Qingping, this advance paves the way for the commercial application of the technology. “We are working with the industry to accelerate commercialization.
With stricter regulations on hydrofluorocarbons (HFCs), this emission-free and highly efficient cooling solution could reshape the industry and contribute to carbon neutrality,” the researcher stated.
Although still in the early stages of development, the technology has the potential to become the future standard in cooling.
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