Experimental investigation of the dynamic behavior of a large-scale refrigeration - PCM energy storage system. Validation of a complete model

- Experimental investigation of a refrigeration-PCM storage system is presented.
- A detailed dynamic model for the coupled system is proposed.
- Fluid flows in heat exchangers and PCM storage are represented by a cascade of CSTRs.
- Phase transitions events according to time and space within heat exchangers and PCM storage are considered in the model.
- Complete comparisons between experimental and simulation results are carried out.

In the area of buildings refrigeration, the use of thermal energy storages coupled with heat pumps is a significant way for reducing the operating costs and optimizing the design of equipment. In this paper, a prototype of large-scale refrigeration - PCM (Phase Change Material) energy storage system is described, from which experimental results on transient behavior are obtained. A dynamic model for transient simulation of the coupled system is presented. The fluid flows through the heat exchangers and the storage tank are represented by a cascade of Continuous Stirred Tank Reactors (CSTRs). Switching procedures between different model configurations associated to phase transitions within heat exchangers and PCM storage tank are mathematically performed by matrix operations. The compressor, the expansion valve and the pressure drop across the evaporator are represented by static models based on empirical correlations. A PI controller for the expansion valve opening is integrated in the heat pump model to maintain the superheat at evaporator exit. The model is validated by a complete and detailed comparison between simulation and experimental results.