Volume 52

Analysis of Chilled Water Storage Integration in Air Conditioning Systems for Dynamic PV Self-Consumption Wanfang Zhao, Jinqing Peng, Jingyu Cao

Abstract

Chilled water storage is commonly employed in centralized cooling systems for peak shaving, demonstrating significant potential of load flexibility. However, this cost-effective and accessible flexibility resource has seldom been integrated into domestic air-conditioning systems in response to dynamic electricity tariffs or photovoltaic (PV) generation. This paper focused on capacity design and performance evaluation of air-conditioning systems integrated with chilled water storage for improving PV self-consumption in domestic applications. Operation strategies involving temperature control and flow rate control were both considered. The results show that chilled water storage presents an annual cost saving of over 10% and significantly improves PV self-consumption compared to the baseline case without storage. Furthermore, the chilled water storage shows its additional advantage over the battery system in reducing the capacity of the chiller from 7.5 kW to 6.7 kW and enhancing energy efficiency of the air-conditioning with an average COP increasing from 2.87 to 3.14.

Keywords chilled water storage, demand-side management, optimal design, residential buildings, partial-load efficiency