农业机械学报2012，Vol.43Issue(11)：180-185,219,7.DOI:10.6041/j.issn.1000-1298.2012.11.034
空气流速对温室地下蓄热系统加温时热湿传递的影响
Effects of Air Velocity in Heat Exchanging Pipes to Heat Exchanging and Water Vapor Transformation of Underground Heat Storage System in Greenhouse during Heating
摘要
Abstract
Effects of the air velocity in heat exchanging pipes on heat exchanging and water vapor transformation was studied in double-film covering greenhouse during heating at night in winter. The temperature and humidity in inlet and outlet of heat exchanging pipes, floor temperature in heat storage greenhouse and outside temperature were measured at different air velocities in the heat exchanging pipes. The humidity ratio, enthalpy of inlet and outlet of heat exchanging pipes and the power for heating were computed. The results showed that the temperature and enthalpy of cold air with high humidity flowing through heat exchanging pipes increased apparently and the humidity reduced when the air velocities in heat exchanging pipes were respectively 0. 6 m/s, 1. 0 m/s, 1. 5 m/s, 2. 0 m/s, 2. 5 m/s and 2. 8 m/s during heating at night after heat saving in clear days. The power for heating was enhanced with the increase of the air velocity in heat exchanging pipes. The average power for heating is 1. 0 kW, 1. 6 kW, 3. 2 kW, 6.4 kW, 7. 2 kW and 7. 7 kW respectively. The heating effects is not distinct when the air velocity in heat exchanging pipes is less than 2 m/s, while the continuity for heating is poor when the air velocity in heat exchanging pipes is higher than 2. 5 m/s. Therefore the rational air velocity in heat exchanging pipes is 2. 0 m/s for heating at night when the temperature satisfies the growing requirements of the crops.关键词
温室/地下蓄热系统/空气流速Key words
Greenhouse/ Underground heat storage system/ Air velocity分类
农业科技引用本文复制引用
王永维,梁喜凤,程绍明,王俊,苗香雯..空气流速对温室地下蓄热系统加温时热湿传递的影响[J].农业机械学报,2012,43(11):180-185,219,7.基金项目
国家高技术研究发展计划(863计划)资助项目(2012AA10A504)、浙江省教育厅科研项目(20050912)和中央高校基本科研业务费专项资金资助项目 （863计划）
