Assessment and optimization of solar absorption-subcooled compression hybrid cooling system for cold storage

The solar absorption-subcooled compression hybrid cooling system is an economically viable energy-saving solution for cold storage refrigeration system. However, the thermodynamic and economic performance of this system has not been assessed specifically for cold storage. Additionally, the system performance strongly depends on the appropriate design of critical parameters, which has not been previously analyzed either. Therefore, a technical and financial evaluation of the solar absorption-subcooled compression hybrid cooling system for cold storage is implemented systematically in this study based on the simulation of the typical days. The effects of the absorption subsystem size and storage tank volume are analyzed. Furthermore, global optimization is performed using the genetic algorithm. It is determined the optimal design is as follows an absorption subsystem size of 0.04-0.06 kW/m(2) with a storage tank volume of 40-60 L/m(2) for the case in which the collector area (2000 m(2)) is half the available area. The peak annual electric energy savings is 68.8 kWh/m(2). The solar absorption-subcooled compression hybrid cooling system is economically viable for cold storage without any subsidy and the minimum payback period is 4.96 y. This study can be beneficial for the effective and feasible reduction of the energy consumption of cold storage refrigeration systems.