The interest in application of secondary refiigerant systems in supermarket refrigeration is increasing. Reduced refrigerant losses i and the chance for lower installation and operation costs is promoting this development. There are also !options to use natural refrigerants, more efficient refrigerants and gas or waste heat driven absorption proc;esses. First installations of secondary refriger...

As refrigeration compressor manufacturers introduce machines with improved efficiencies there is a need for updating performance data. The compressor performance data which is published should be a true representation of the actual compressor performance, historically this has resulted in lengthy test programmes for the compressor manufacturer. A system is required which can accurately produce ...

The functionality of industrial refrigeration systems is important for environment-friendly companies and organizations, since faulty can impact human health by lowering food quality, cause pollution, even lead to increased global warming. Therefore, in this industry, there a high demand among manufacturers early automatic fault diagnosis. In paper, different machine learning classifiers are te...

In this paper, the cascade refrigeration system and load cooling of natural working medium are integrated as one unit system, which can meet needs different temperature zones refrigerating in supermarkets. The concrete implementation scheme with R717 high refrigerant, CO2 low refrigerant carrier was designed. According to actual commercial super, design calculation NH3 cryogenic were carried ou...

The Large Hadron Collider (LHC), a 26.7 km circumference superconducting accelerator equipped with high-field magnets operating in superfluid helium below 1.9 K, has now fully entered construction at CERN, the European Laboratory for Particle Physics. The heart of the LHC cryogenic system is the quasi-isothermal magnet cooling scheme, in which flowing two-phase saturated superfluid helium remov...

As refrigeration compressor manufacturers introduce machineswith improved efficiencies there is a need for updatingperformance data.The compressor performance data which is published should bea true representation of the actual compressor performance,historically this has resulted in lengthy test programmes for thecompressor manufacturer. A system is required which c...

Studied is a kind of NH3/CO2 two-stage low temperature refrigeration system, in which NH3 is used as the refrigerant in the high-temperature stage and CO2 is used as the refrigerant in the low-temperature stage. The performance of the system is simulated and analyzed by changing the mean temperature of the evaporator-condenser and the temperature of the condenser. The mean temperatures of the e...