既有公共建筑光储直柔低碳供冷系统更新与运行实测分析
Retrofitting and operational performance analysis of photovoltaic,energy storage, direct current, and flexibility (PEDF) integrated low-carbon cooling systems in existing public buildings
摘要：
光储直柔低碳供冷系统是建筑部门低碳转型的重要实践。本研究面向存量建筑低碳化改造需求,突破光储直柔既有研究聚焦于新建建筑与小功率设备应用的局限性,构建了“产-消-储-调”协同的新型低碳供冷系统,并对某既有公共建筑开展了供冷系统低碳更新工程实践。研究结果显示,光储直柔低碳供冷系统的运行能效比达到4.5,单位制冷量成本为0.126元/(kW·h),运行碳排放强度为0.443 kg/(kW·h),相较于市政电网的碳排放强度降低了31%。进一步分析表明,柔性双向变换器和变压器的实际运行负载率偏低,未来的研究需基于可再生电力消纳情况进一步优化关键变换器的容量配置,以避免设计冗余,提高系统的经济性。
Abstract：
The photovoltaic, energy storage, direct current, and flexibility (PEDF) integrated low-carbon cooling system represents a critical pathway for decarbonizing existing buildings. Targeting the retrofit demands of low-carbon renovation of existing buildings, this study overcomes prior PEDF research limitations focused on new buildings and low-power devices by developing a “generation-consumption-storage-regulation” integrated low-carbon cooling system. Through engineering implementation in a public building, the PEDF integrated low-carbon cooling system demonstrates a comprehensive energy efficiency ratio of 4.5, with a unit cooling cost of 0.126 yuan/kWh, and operational carbon emission intensity of 0.443 kg/kWh, achieving a 31% reduction compared to municipal grid benchmarks. Further analysis reveals suboptimal operational load rates for the flexible bidirectional converter and the transformer. Future research should optimize converter capacity allocation based on renewable energy utilization requirements to minimize design redundancy and enhance system cost-effectiveness.
Keywords:existing public building; photovoltaic, energy storage, direct current, and flexibility (PEDF); cooling system; alternating current/direct current (AC/DC) hybrid distribution system; field test and analysis; low-carbon renovation