Selection and Optimization of Multiple Chillers Based on Dynamic Loads in Building

The total energy consumption of the chiller group in the building system accounts for a large proportion, and the selection and operation control of the chiller group plays an important role in realizing the energy saving of the air-conditioning system. Taking a star hotel building as an example, through the calculation of building cold load and chiller load, eight design schemes are analyzed in terms of energy consumption, and SCOP evaluation indexes are proposed for the energy consumption performance coefficients of multiple chiller groups. The results show that for this building, three-unit symmetrical design scheme has the smallest operational energy consumption throughout the air-conditioning season. The overall performance of the cluster of units with lower operational energy consumption was found to be higher in the zones where the cumulative time frequency of the building load was larger, and was characterized using the average SCOP parameter. Three-unit symmetrical design scheme can save 15.7% energy by operating in the building during the air-conditioning season compared to the highest energy-consuming group scheme.