Submission
Cold thermal energy storage for supermarket applications: Numerical investigation
DOI: 10.18462/iir.compr.2024.0653
Session: Reciprocating compressors II
Accept state: Submission accepted
Authors
| Name | Organization | |
|---|---|---|
| Mahmood M. Joybari | NTNU | |
| Shuai Ren | NTNU | |
| Neshan D. Weerawardhana | NTNU | |
| Armin Hafner | NTNU |
Abstract
The supermarket refrigeration sector has experienced significant transitions, with a strong focus on reducing energy demand, installation costs and environmental friendliness. Supermarket refrigeration systems typically operate at part load with lower efficiency than designed. In this context, application of cold thermal energy storage (CTES) technologies can provide cooling load during peak times, reducing the peak load demands. The Norwegian supermarket chain REMA1000 typically uses a glycol loop in CO2 refrigeration systems to deliver both the refrigeration loads and air conditioning loads. The systems are designed for summer days, resulting in part load operation during most of the year. To address this issue, a CTES unit was designed and simulated to supply the air conditioning demand in a supermarket. Separate simulations of the existing system and CTES integrated into the existing system have been investigated. It was found that by integrating CTES into the existing supermarket refrigeration system, there could be electricity cost savings in the range of 4.5% to 14% based on the temperature of the day and different tariff structures applied.
Keywords
Phase Change Material, Latent Heat Storage, Ice Storage, Pillow-Plate Heat Exchanger, Carbon Dioxide, Dymola