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After 28 years, Asia Pacific has experienced the whole process of transformation from providing basic services to "diversified development of enterprises", and at the same time, it is constantly improving the business scope of enterprises.
Combining new exchange membrane with air conditioning system can achieve 100% outdoor air circulation in the room
Release time:
2021-07-06 13:55
Source:
Https://www.xianjichina.com/special/detail_487460.html
Until now, it is well known that circulating outdoor air in buildings is safer than circulating indoor air, which has been confirmed in pandemics. The problem is that this is not cost-effective.
That may soon change. Purdue engineers have proposed a system that combines new membrane technology with the latest HVAC systems to make 100 percent outdoor air systems more energy-efficient and economically viable-especially in warm, humid climates. They say their system can save up to 66% in energy costs for large buildings that choose to use safer outdoor air.
Previous research from Purdue University has shown that HVAC systems (heating, ventilation and air conditioning) are a key factor in the spread of airborne diseases such as the new coronavirus in indoor environments such as office buildings, restaurants and airplanes.
James E. Braun, professor of Herrick engineering at Purdue University and director of the Center for High Performance Buildings, said that most people don't realize the complexity of modern HVAC systems, and that there is a specific sweet spot for humidity in indoor environments that is between 40 and 60 percent. Anything drier than this, people will be uncomfortable; anything more humid, you risk mold and other problems.
Therefore, simply opening the window is not a solution.
If you introduce outdoor air, the humidity level of the building will fluctuate wildly. It is an incredible challenge to maintain the right balance between temperature, humidity, human comfort and overall cost.
Braun said that in a typical HVAC system, almost 40% of the energy is used to dehumidify the air. This makes the heating or cooling of the outdoor air more energy and cost intensive.
To solve this problem, Braun collaborated with David Warsinger, an assistant professor of mechanical engineering, who specializes in using membranes for water filtration and desalination. They proposed a system called an active membrane energy exchanger, which integrates specialized membranes into the HVAC system to reduce the energy used to dehumidify the outside air. Using such a system in a large building like a hospital can reduce energy costs by up to 66% compared to current fully outdoor air systems.
Their research has been published in Applied Energy.
Andrew Fix, a doctoral student in mechanical engineering at Purdue University and lead author of the paper, said: "Membranes are key, and we use membranes that are water vapor selective, meaning they only allow water vapor to pass when a pressure differential is applied, but block air. By passing air through these membranes, we can pull water vapor out of the air and reduce the load on the motors and compressors that run the refrigeration cycle."
To measure the effectiveness of the system, the team used computer models of hospitals under different climatic conditions created by the Pacific Northwest National Laboratory. Hospitals are ideal test beds because they are large indoor environments, and their HVAC systems usually require a higher proportion of outdoor air for safety reasons. Computer models show a decrease in energy use at all sites using active membrane systems. Hotter and wetter places such as Tampa, Houston and New Orleans all showed the greatest energy savings.
"The hotter and wetter the place, the better our system works, which is a key finding because as the climate continues to warm around the world, places that want to use 100 percent of outdoor air will now be able to afford it economically. "Fix said happily.
The researchers are working to build a physical prototype to validate their computer model. But the stakes right now are more than just saving energy.
Fix believes that the new coronavirus is a wake-up call for all of us that heating and cooling our buildings is not just a matter of temperature and humidity, it can actually be a matter of life and death. He hopes that this work will help make all our indoor spaces safer.
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