燃气冷热电三联供的设备间通风系统模拟研究

Abstract

燃气冷热电三联供(Combined cooling heating and Power system, CCHP)的设备间散热量大，需要合理其通风气流组织，保证设备间的温度满足设备运行最佳温度。通过实验方法确定通风方案成本过高，有必要利用模拟方式辅助设计通风系统。本文通过构建设备间三维数学模型，利用Fluent软件，对CCHP系统设备间的温度场进行数值分析，提出了气流组织形式的改进方案及相应的通风设计依据。按照改进后的通风系统，夏季在进风温度为室外设计温度307 k时，通过模拟分析利用增设冷风设备能够有效地降低发电机组运行的环境温度。冬季在进风温度设计室外温度为269.4 K时，通过模拟分析可利用自然进风和强制排风方式保证设备间的运行环境温度，可节省系统运行成本。 Heat dissipation between equipments of CCHP system, which need well organized ventilation to assure the optimum temperature for equipments running. It costs much to obtain the ventilation plan by experimental method; it is necessary to use simulation as an auxiliary for the design of ventilation system. By the building of mathematical model of equipments and using the software Fluent for numerical analysis of the temperature field between equipments, this paper gives the improvement scheme for air distribution mode and design criteria for ventilation. According to the improved ventilation system, the extra use of cold wind equipment can decrease the running temperature of power generator effectively by simulation under the condition that the inlet air temperature is equal to the design temperature 307 K of outside in summer. In winter, when the inlet air temperature is equal to the design temperature 269.4 K of outside, the use of natural air inlet and forced air exhaust can keep the running ambient temperature between equipments, which can save operation costs of the system.