The final task is to develop and test ways of integrating ducted evaporators into a display case in a manner compatible with efficient operation of its air curtain. The transcritical CO2 cycle is very promising at low-temperature lifts, particularly for heat pumps. We are comparing the performance of several in-house developed systems to the baseline R410A system that is the best conventional system available. The ultimate goal is to understand and control laser beams irradiating solids to create high-intensity filaments on the order of microns. Single phase secondary refrigerants are simpler to use but due to sensible heat, require significant flows.
Ice slurry has potential in flow reduction and thermal storage.
We study experimental flow and heat characteristics of propylene glycol slurry. The nature of compressor lubrication is poorly understood under transient operating conditions. The state of lubrication of swashplate contacts within the compressor ultimately determines the longevity of the compressor. Once developed, the measuring system can be applied to critical contacts in other refrigerant compressors. D. Boewe Hydro Aluminum Thermodynamic analysis indicates that the transcritical CO2 cycle has lower COP than R134a.