Dynamic Characteristics of the Vapor Compression Refrigeration Equipment

Dynamical modeling and thermo-economic optimization of a cold room assisted vapor-compression refrigeration cycle

A cold room assisted vapor-compression refrigeration cycle is dynamically modeled in a year and optimized. Total annual cost (TACO) and coefficient of performance (COP) are selected as two objective functions. Both cold room and refrigeration cycle parameters are considered as design variables. Moreover, three working fluids included R22, R134a and R407c are examined. The optimum Pareto front r...

Using Carbon Dioxide in a Transcritical Vapor Compression Refrigeration Cycle

For most of the last fifty years, refrigeration and heat pump systems have been based on cycles using a fluorocarbon as the working fluid. Hovvever, with the discovery that fluorocarbons may have a profoundly detrimental effect on the earth ·s atmosphere. it has become necessary to find a suitable replacement for a fluorocarbon based refrigeration cycle. Such a replacement must perform comparab...

Automated Fault Detection and Diagnostics for Vapor Compression Cooling Equipment

Automated fault detection and diagnostic (FDD) systems have the potential to reduce equipment downtime, service costs, and utility costs. However, very few commercial products exist and the ones that do exist are very specialized. This may be surprising to some, considering that FDD is very well developed for other applications such as for nuclear power plants, aircraft, chemical process plants...

A Computer Model of the Start-up Transients in a Vapor Compression Refrigeration System

Dynamic Charge Management for Vapor Compression Cycles

While the mass of refrigerant contained in a vapor compression cycle has a significant effect on the cycle’s power consumption, conventional cycle architectures cannot optimize energy efficiency by varying the mass as ambient conditions and operational requirements change. This paper proposes a new system architecture that allows the refrigerant mass circulating in the system to be modulated ov...