农业工程学报2017，Vol.33Issue(8)：176-182,7.DOI:10.11975/j.issn.1002-6819.2017.08.024
畜舍热交换芯体-风机热回收通风系统的热回收效果
Heat recovery effect of heat recovery ventilation system with heat exchanger-fan for livestock house
摘要
Abstract
Heat recovery ventilation, as a kind of energy saving ventilation, can alleviate the contradiction between heating energy consumption and ventilation. The application of heat recovery ventilation system for residential buildings has turned out that it has the problems of low ventilation efficiency and high cost when applied in the livestock house. A modified heat recovery ventilation system for livestock house was designed in this study, and the efficiency of heat recovery ventilation equipment under 3 different operating conditions was tested to find out the optimal operation conditions. In the first operating condition, the temperature difference inside and outside the livestock house was 12.08℃. The size of plate-fin heat exchanger was 500 mm× 500 mm× 250 mm. Fresh air supply adopted a positive pressure way and exhaust air used a negative pressure way. When the approach velocities were 1.05 and 0.86 m/s, the fresh air temperature through the heat exchanger increased by 1.93 and 2.79℃, the sensible heat recovery efficiency was 35.88% and 43.63%, the heat recovery load was 0.16 and 0.19 kW, and the coefficient of performance was 1.37 and 1.61, respectively. The sensible heat efficiency under both approach velocities was far below the energy saving standard in winter (≥65%). In the second operating condition, 2 plate-fin heat exchangers were in cascade connection, and the fresh air went through the 2 plate-fin heat exchangers in sequence. The size of heat exchanger, fan type and ventilation pattern were the same with the first condition. In this way, when the temperature difference between inside and outside was 10.49℃, the fresh air temperature passing through the first heat exchanger increased by 2.59℃. The sensible heat recovery efficiency was 52.11%, and meanwhile the heat recovery load and the coefficient of performance were respectively 0.39 kW and 3.26. The poor performance of the second heat exchanger showed that the two heat exchangers in series for livestock house were unnecessary. In the third configuration condition, both matching parameters and connection ways between heat exchanger and fans were optimized. The plate heat exchanger and the axial flow fan with low noise and large volume were used. The heat exchanger size was 600 mm× 600 mm× 600 mm. Both fresh air supply and exhaust air used a negative pressure way. When the temperature difference between inside and outside was 12.12℃ and the approach velocity was 4 m/s, the fresh air temperature increased by 8.23℃. The sensible heat recovery efficiency was 69.9%, and the coefficient of performance was 8.0, meeting the national energy-saving standard requirement. It is concluded that the heat recovery ventilation aimed to improve the balance between heat recovery efficiency and ventilation efficiency can meet the requirement of large volume ventilation and energy saving in the livestock house. So it is of great value to optimize the parameter and structure of heat recovery ventilation system for livestock house.关键词
热回收/热交换/通风/畜舍/显热回收效率/热回收负荷Key words
heat recovery/heat exchangers/ventilation/livestock house/sensible heat recovery efficiency/heat recovery load分类
农业科技引用本文复制引用
李琴,刘鹏,刘中英,王美芝,刘继军,吴中红..畜舍热交换芯体-风机热回收通风系统的热回收效果[J].农业工程学报,2017,33(8):176-182,7.基金项目
福利低碳环保养鸡设施技术与设备研发(2014BAD08B08-3) （2014BAD08B08-3）
南方地区草食家畜舍饲小气候调控技术研究(201303145) （201303145）
国家兔产业技术体系(CARS-44-D-4) （CARS-44-D-4）
