| 摘要: |
| 人工环境实验室可为空调制冷设备提供国家标准规定的各种实验工况，其流场越均匀稳定，被试样机周围工况的变化梯度越小，性能测试的不确定度越低，而人工环境实验室的内部流场与送风风道各风口出风量密切相关。本文利用理论计算得到了人工环境实验室6种风道（方形送风风道（对照组），30°/45°/60°斜坡送风风道，等高度/等风量连续斜坡送风风道）在同一送风条件下各风口截面的风速，并进行了实验验证，实测与计算的最大相对误差为16.35%，表明该计算方法具有推广价值，且可推荐的送风速度范围为2～6 m/s。本文提出以综合指标（送风效率（压降）指标/均匀性指标）评价送风风道热力性能，结果显示60°斜坡送风风道的综合指标最佳。 |
| 关键词: 人工环境实验室 送风风道 近似计算 实验验证 评价指标 |
| DOI： |
| 投稿时间：2017-07-03
|
| 基金项目:江苏省教育厅高校自然科学基金（15KJD470001）资助。 |
|
| Calculation, Verification, and Evaluation of Air Supply Duct with Various Configurations in Artificial Environment Laboratory |
|
Qi Xinqiu1, Zhang Zhongbin1, Huang Hu1, Shi Min2
|
| (1.Engineering Laboratory of Energy System Process Conversion and Emission Reduction Technology of Jiangsu Province, School of Energy and Mechanical Engineering, Nanjing Normal University;2.Hefei General Machinery Research Institute) |
| Abstract: |
| An artificial environment laboratory provides test conditions specified in the national standards for air conditioning and refrigeration equipment; the more uniform and stable the flow field are and the smaller the change in gradient around the test sample under the working conditions is, the lower the uncertainty in the performance test results is. Specifically, the internal flow field achieved in a laboratory is closely related to the air outlet of the pipelines used in the lab. In this paper, the outlet speeds of a square duct (control group), and air supply ducts with 30?, 45?, and 60? slopes, are analyzed and compared with an air supply duct with a continuous slope at a constant height and an air supply duct with a continuous slope under a constant air volume. Further, the calculated results are verified experimentally, and the maximum relative error of the measured and calculated results is 16.35%. The results show that the approximate calculation method has a noticeable value when designing an artificial environment laboratory, and the air velocity in the supply air duct is recommended to be within 2–6 m/s. Finally, a comprehensive index, i.e., the uniformity index/ventilation efficiency (drop) index, is put forward to evaluate the performance of supply air duct in this investigation. It is shown that an air supply duct with a 60? slope works best based on the comprehensive evaluation index. |
| Key words: artificial environment laboratory airflow configuration approximate calculation experimental verification evaluation index |
