居住建筑夜间排风热回收运行性能

Performance of exhaust heat recovery in residential building at night

基于睡眠热舒适和室外气象参数的排风热回收性能全面分析数学模型,提出排风热回收节能评价指标即节能潜力指数。应用该指标对我国不同热工分区下的3个典型城市居住建筑夜间排风热回收节能效果进行分析,并依据热回收效率和室内设计参数对排风热回收运行方案进行优化。研究结果表明:在制冷季,全热回收模式下夏热地区几乎全时段均可采用排风热回收;在寒冷地区和夏热冬冷地区全年更适合采用全热回收模式,而夏热冬暖地区制冷季采用全热回收模式、制热季采用显热回收模式更为有利;全热回收效率对夏热地区的制热季节能潜力指数的影响不大,而显热回收效率几乎对各典型城市制冷季节能潜力指数没有影响;在制冷季选择较高的温度和较大的相对湿度、制热季选择较低的温度和较小的相对湿度可有效减小空调运行能耗。

Based on the thermal comfort of sleeping and outdoor meteorological parameters, a mathematical model about comprehensive analysis of exhaust heat recovery performance was established, and evaluation of exhaust heat recovery of energy-saving potential index was proposed. The performance of exhaust heat recovery energy-saving in three typical urban residential buildings of different thermal partitions was analyzed. Exhaust heat recovery running scheme was optimized on two main factors of heat recovery efficiency and indoor design parameters. The results show that the exhaust heat recovery can work in whole cooling season in hot summer regions in the condition of enthalpy recovery pattern. Cold regions, hot summer and cold winter regions are more suitable for enthalpy recovery pattern all-year round, but using enthalpy recovery pattern in cooling season and using sensible heat recovery pattern in heating season are more favorable in temperate regions. Enthalpy heat recovery efficiency doesn＇t affect the energy saving potential index of hot summer regions a lot in heating season, and sensible heat recovery efficiency almost doesn＇t affect it in cooling season of all typical urbans. Choosing relatively high temperature and greater relative humidity in cooling season, and choosing relatively low temperature and smaller relative humidity in heating season can effectively reduce air conditioning energy consumption.