It is also quantifying benefits of reducing transient losses by reducing charge inventory, as a potentially simple alternative to variable-speed fans and compressors as a means of increasing system efficiency. The overall aim of this project is to investigate noise radiation and flow-induced force excitation in expansion devices, design and build devices to measure sound pressure inside the refrigeration tubes, and explore possibilities for noise reduction by varying orifice tube geometry or other parameters. Further understanding of two-phase choked flow phenomena is acquired in experimental testing as a part of this project. The Trane Co. The goal is to investigate maldistribution and fractination in brazed plate heat exchangers, especially when operating with lower mass velocities.
Special attention is focused on the stability of the superheat signal.
Oil hold-up is investigated along with different distribution options. A circulating liquid concept should increase energy efficiency, reduce inventory and leakage of expensive and environmentally damaging refrigerant, and utilize centralized units that are more reliable, efficient, and less expensive. The project determines viable fluids, appropriate defrost technique, and will experimentally verify models developed. Additional attention is given to CO2 and ice slurry as secondary fluids that operate with phase changes. D. Boewe Hydro Aluminum Thermodynamic analysis indicates that the transcritical CO2 cycle has lower COP than R134a.