The status quo of operation of HVAC water-side systems in China: a perspective from BAS data

Building stock is a substantial consumer of energy worldwide, and HVAC systems are substantial consumers in buildings. Therefore, it is of great importance to improve the energy efficiency of HVAC systems. For existing HVAC systems, energy savings can be achieved by optimizing the operation strategies. To identify current chiller operation limitations, and evaluate their impacts on energy consumption, a systematic study has been performed. First, the information about operation strategies in about 15 buildings are collected, by either on-site survey or data mining from BAS data. Then, three features(i.e. Avgp, Stdp and Rcap_T) are proposed to characterize these operation strategies. Finally, the influence of these three features on cooling energy consumptions are analyzed. It is found that Rcap_T(correlation coefficient between cooling capacity of online chillers and outdoor air temperature) has strong negative impact on cooling energy usage.