Design and thermodynamic analysis of a novel energy storage unit for cooling systems

Procuring solicitiously the continuity of energy obtained from energy resources and to manage the supply-demand balance in a controlled manner has brought energy storage studies to the fore. Thermal energy storage, which is one of the energy storage types, will ensure the efficient use of energy for air conditioning and drying systems that make use of heat and cold energy. In this study, with energy storage in ice cold storage and heat storage with hot water storage tank are carried out in the double-effect heat pump system. Thus, a design has been made in which the thermal energy required for the industrial drying system is met with a single system.System performances were calculated by performing thermodynamic analysis according to R32 and R290 refrigerants. When comparisons are made according to the data obtained; Dual performance coefficients (COP dual) are calculated as 7 for R290 refrigerant and 6,75 for R32. The compatibility of the refrigerants with the system and the efficiency coefficients were similar to each other. When the environmental effects are compared, although the ozone depletion potential (ODP) values in both refrigerants are 0, the R290 refrigerant has come to the fore with its global warming potential (GWP) value of 3. In the case of storing ice and hot water according to multiple electricity tariffs in the heat pump system, an energy cost analysis was performed compared to a conventional heat pump system. Energy costs of 45 676 TL/year for R290 refrigerant and 47 792 TL/year for R32 refrigerant were saved by producing 1 ton of ice per hour in the system, storing energy in ice for 8 hours and storing waste heat as hot water. Compared to the studies in the literature, a higher system COP value was obtained with both the storage of energy in ice and the storage of hot water. In addition, by performing waste heat storage instead of a natural gas boiler, annual CO2 emissions of 22,7 tons for the system with R290 refrigerant and 23,7 tons for the system with R32 refrigerant are prevented. The design made in order to ensure continuity, cheapness, efficiency and reduction of environmental impacts in energy systems will create an alternative option for industrial drying systems.