Verification of optimum operation method by simulation for the HVAC system with a thermal storage tank in an actual building

An optimum operation scheme was applied to the thermal storage system in an actual building and evaluated using measurement data. First, the accuracy of the load prediction was verified. In a trial operation, the expected error percentage (EEP) of the sum of the daily cooling load was 9.8%, which shows the cooling load prediction is sufficiently accurate for practical use. Second, the accuracy of the system simulation of the HVAC system was verified. The simulation error of the total energy consumption was 0.6% on average, and the root mean square error (RMSE) was 4.9 kWh, which indicates that the simulation is sufficiently accurate for estimating the performance of the HVAC system. Finally, the effect of optimum operation was verified by measurement data. The coefficient of performance (COP) of the heat source system was improved by 3.5% and the COP of the entire system was improved by approximately 10.9% with optimum operation.