Looking for a new low-carbon-free refrigeration for Sonic will come out of air conditioning

Recently, the United States, Eastern Europe and Asia have suffered heatwave, the air conditioning was the last straw man.

But the environment is a bad news. Scientists believe that residential and commercial air conditioning in greenhouse gas emissions in occupies an important position, but as the temperature increases, people will use more air conditioning while already existing old air conditioning will be at a higher power consumption, global warming trend will intensify. Scientists are trying many ways to improve the air conditioner's carbon footprint.

Refrigeration cycle

London South Bank University in Grand m · Mei de Mun has long been engaged in environmentally friendly refrigeration system system of researchers, in his view should use carbon dioxide substitution in this type of system used synthetic HFC refrigerants, traditional evaporative compression cycle, the coolant is condensing expansion after gasification to give room for refrigeration.

Compression stages produce heat radiation into buildings in General is in the air outside. According to MUI gadmen, which play a key role of HFCs such causes global warming gases are carbon dioxide 4000 times. Only the United Kingdom, 20% of greenhouse gas emissions are attributable to such substances.

At the same time, the carbon dioxide than HFCs compression produces heat higher than 150 degrees Celsius: 60 degrees Celsius.

Therefore Mette Kment and colleagues are investigating the use of CO2 refrigeration air conditioning supermarkets and refrigerator energy produced by the mind, consider these thermal utilized as needed to provide hot water.

Acoustic refrigeration

From the United States Pennsylvania State University College of Matt Parker · Perth now and my colleagues are developing a voice-free air conditioning system.

The team used a linear motor and moving loudspeakers metal sheet, in issuing a nitrogen will not cause the greenhouse effect Sonic, Sonic in gas regional produce compression and expansion, causing them to take turns heating and cooling, Perth, the entire process is like a sponge, gas absorption heat a region and then by Sonic to another zone, calorie eventually expelled gases.

"He said.

The group "for ice-cream manufacturers before the & Jerry" manufacturing a this known as thermoacoustic refrigeration technology of refrigerators.

They said, you can use technology to the air conditioning equipment, and try to build a batch 3.5 kilowatts, household equipment, housed in the buildings around. If not, it will be able to reduce traditional energy consumption of air conditioning systems.

Water cooling

Other team also began to research and development will not lead to climate warming refrigerants.

One approach is to use ammonia and water mixture. Atlanta, Georgia Tech Research Institute's sirui Niwas · Gary camera is developing a use ammonia vapor heat transfer system. According to his ideas, ammonia flows through the condenser, and then enters the evaporator, where it produces the ultimate cooling effect, is diluted again.

Absorption refrigeration technology is not without precedent, the technical principles of evaporation than today common compression refrigeration system still early, but needs more heat exchanger and slightly cumbersome, so most was applied in the central air conditioning system, a large complex of refrigeration.

Therefore, Gary camera through the development of micro heat exchanger to avoid this problem, the solution through the exchanger only 0.5 mm diameter pipes, fully improve this size heat exchanger efficiency. His team has developed the book size, have the equivalent of 300 Watt cooling effect of prototype, and plan to use the advanced research projects in the United States Department of the Fund to further increase the cooling power equipment.