谷电相变蓄冷空调系统在某大型商业超市应用的性能分析及经济性评价
Performance analysis and economic evaluation of valley power phase change cold storage air conditioning system applied to a large commercial supermarket
摘要：
以深圳某商业超市空调制冷工程为例,结合峰谷电价差,针对水合盐相变蓄冷技术在大规模舒适性商业领域的应用进行了性能分析及经济性评价。该项目采用原制冷机房中备用制冷机组作为冷源,相变蓄冷机组夜间利用谷电蓄冷,白天将冷量供给商业超市空调制冷系统,满足用户用冷需求。本文系统测试并分析了谷电相变蓄冷系统连续运行14天的蓄、放冷温度,蓄冷量,耗电量等实验数据。结果表明:相比原有制冷系统,采用谷电相变蓄冷系统作为冷源时,夜间制冷机组的性能系数(COP)和系统能效比(EER)大幅提高;该项目的投资回收期为5.35 a,随着峰谷电价差逐步拉大,当峰谷电价差≥1.06元/(kW·h)时,系统的投资回收期≤4 a;水合盐相变蓄冷技术结合谷电/弃电等在大规模舒适性商用空调领域应用具有可行性。
Abstract：
Taking the air conditioning and refrigeration project of a commercial supermarket in Shenzhen as an example,combined with the peak-to-valley electricity price difference,the performance analysis and economic evaluation are conducted on the application of hydrated salt phase change cold storage technology in the large-scale comfortable commercial field.This project utilizes the backup refrigeration unit in the existing refrigeration room as the cold source,and the phase change cold storage unit uses valley power to store cold at night,and supplies the cold energy to the air conditioning and refrigeration system of the commercial supermarket during the day to meet the cooling needs of users.In this paper,the experimental data of cold storage/discharge temperature,cold storage capacity and power consumption of the valley power phase change cold storage system are systematically tested and analysed for 14 days.The results show that compared with the original refrigeration system,using the valley power phase change cold storage system as the cold source,the refrigeration unit coefficient of performance (COP) and system energy efficiency ratio (EER) in night are significantly improved.The payback period of the project is 5.35 years,and with the gradual widening of the peak-to-valley electricity price difference,when the peak-to-valley electricity price difference is not less than 1.06 yuan/(kWh),the payback period of the system can decrease to less than 4 years.It is feasible to apply hydrated salt phase change cold storage technology combined with valley power/curtailment power to the field of large-scale comfortable commercial air conditioning.
Keywords:commercial supermarket; valley power; phase change cold storage; peak-to-valley electricity price; air conditioning system; economic evaluation