【摘要】 燃气轮机驱动的冷热电三联供系统是我国近年来大力鼓励发展的小型能源供应系统,将蓄能装置与联供系统结合对系统供能设备能起到减容增效的作用。本文建立了相变蓄能型联供系统的简化数学模型,提出了在给定实际用户负荷的情况下,以一次能耗最小为优化目标的最佳相变温度确定方法。典型算例分析表明,相变型烟气蓄热器的最优相变温度与用户负荷及设备性能相关,相比于NTU无限大,NTU有限大时,最优相变温度会升高,最小一次能耗会增大。更多还原

【Abstract】 Natural gas driven Building Cooling Heating and Power(BCHP) system is encouraged to develop as small-scale energy supply system in recent years.In this paper,a thermodynamic model of BCHP system with phase change material(PCM) energy storage is established.According to practical user loads and considering the correspondingly hourly changing flow rate in charge and discharge processes,a simplified method is proposed to determine the optimal phase change temperature for BCHP-TES,aiming to minimize the primary energy consumption of BCHP-TES system.An illustrative example shows that the optimal phase change temperature can be obtained for given loads.It also indicates that compared to infinite NTU for PCM-TES,the optimal phase change temperature will increase as well as the corresponding minimal primary energy consumption for finite NTU.This work is of great importance for PCM optimization of BCHP-TES system design.更多还原