交流电电热器加热板温度的变化规律


【刊名】 吉首大学学报(自然科学版), 2004年 02期
【作者】 金春英 林金清 翁荣周
【机构】 华侨大学化工系 福建泉州
【关键词】 交流电 电热器 传热模型 差分法 振幅准数
【英文关键词】 alternating current electric heater heat transfer model difference method amplitude number
【中英文摘要】 研究了以交流电为电源的加热板电热器的加热热行为 ,建立了传热模型 ,用数值方法求得温度随时间的变化关系 .计算结果表明 :温度的变化周期与加热源的交变周期完全一致 ,且其交变周期为电压交变周期的 1 2 ;振幅大小与平均加热量q、加热源周期τq、总热容 ρcV及单位温度变化的换热量aA有关 .定义振幅准数 ,根据计算结果找出了振幅与振幅准数等影响因素的定量关系
Thermal characteristic of hot plate in alternating current(AC) electric heater is studied,the heat transfer model is built and is solved by numerical method to find out the relationship between temperature and time.The results indicate:The periodicity of temperature completely matches with that of AC electric heating source,and its value just is half of the periodicity of AC electric voltage,that is τ_t=τ_q=12τ_e.The effects of heating power (q),periodicity of heating source (τ_q),total heating capacity (ρcV),heat exchange rate per 1 K (aA) on amplitude value are studied in detail.An amplitude number is defined,and a quantitative regression equation between amplitude and amplitude number is found.