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"Double bubble" technology boosts chiller efficiency

NANOTECHNOLOGY used in a refrigeration lubricant additive could significantly boost the energy efficiency of chillers, according to US research.
The government-run National Institute of Standards and Technology (NIST) has found that dispersing the right amount of copper oxide particles in a standard polyester refrigerant lubricant and combining it with R134a improves heat transfer by between 50% and 275%.

The particles, which are just 30 nanometers in diameter, are thought to encourage secondary nucleation ­ bubbles on top of bubbles. This 'double-bubble' effect is said to enhance boiling heat transfer and, ultimately, could help to boost the energy efficiency of industrial-sized cooling systems.

Just how nanomaterial additives to lubricants improve the dynamics of heat transfer in refrigerant/lubricant mixtures is not thoroughly understood, but the right concentration of nanoparticles appears to be crucial.

On the basis of work so far it appears that nanoparticles of materials with high thermal conductivity improve heat transfer rates for the system.

Preliminary results of the NIST research also indicate that, in sufficient concentrations, nanomaterials enhance heat transfer by encouraging more vigorous boiling of the mixture.

The IOR Annual Conference – a conference on-demand

Delegates to the IOR Annual Conference taking place from 21 to 22 April will get the chance to access the event live and all sessions and recordings for up six months afterwards providing fantastic value and allowing anyone registering for the event ...


Extending R-32 scroll chiller energy savings

Carrier has introduced high-performance heat recovery and free cooling options to its AquaSnap 30RBP air-cooled scroll chiller range on lower global warming potential (GWP) R-32 refrigerant, providing even greater energy savings and further reducing ...


Sanhua welcomes Neil Panting as the new Sales Manager for the UK, Ireland & Scandinavia.

Neil is responsible for the wholesaler segment, providing wholesalers with both sales and technical support.
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