21 December 2010

Modeling Supermarket Refrigeration with EnergyPlus™


Supermarket refrigeration capabilities were first added to the EnergyPlus energy simulation software package in 2004. At that time, it was possible to model a direct expansion (DX) rack system with multiple refrigerated
cases. The basic simulation software handles all the building energy uses, typically on a 5 to 10 minute time step throughout the period of interest. The original refrigeration module included the ability to model the sensible and latent interactions between the refrigerated cases and the building HVAC system, along with some basic heat recovery capabilities. Over the last few years, the refrigeration module has been expanded to handle more complex systems, such as secondary loops, shared condensers, cascade condensers, subcoolers, and walk-in coolers exchanging energy with multiple conditioned zones.