| 摘要: |
| 本文通过推导在冷冻水绕流发热球体传热过程中，水池内水体平均温度随时间的变化公式，研究冷冻水理论降温所需最小流量、水体稳定温度和所需稳定时间的主要影响因素，分析水池内所容纳水体质量及初始温度、冷冻水流量及温度等参数对水体温度稳定性的影响。根据某工程实际情况确定冷冻水温度、流量等参数，运用理论推导公式和CFD模拟技术计算水体温度稳定性。结果表明：当冷冻水温度为17 ℃时，理论最小质量流量为83.67 t/h。经过6~7个月后水体温度将达到稳定，稳定温度为22.44 ℃。 |
| 关键词: 温度稳定性 集总参数法 CFD模拟 发热球体 冷冻水参数 |
| DOI： |
| 投稿时间：2018-11-12 修订日期：2019-03-14
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| 基金项目:中央高校基本科研业务费专项资金（22120180567）资助。 |
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| Analysis on the Temperature Stabilities for Chilled Water Flow Passing a Submerged and Heated Sphere |
| Zhao Wenxuan,Zhang Xu,Ye Wei,Wu Chao |
| (School of Mechanical and Energy Engineering, Tongji University;School of Mechanical and Energy Engineering, Tongji University;Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education, Tongji University) |
| Abstract: |
| In this paper, the design of the chilled water system that is used to neutralize heat was investigated. First, the stability of the water temperature was defined as: 1) The steady-state temperature; and 2) the time to reach steady-state temperature distribution in the pool. Then,a formula was deduced, by considering the heat transfer between the chilled water and heat sources, to represent the average temperature of the water in the pool over time. The main influencing factors of the theoretical minimum flow for cooling, steady-state temperature, required time, (e.g., initial water temperature in the pool) mass flow rate, and temperature of the chilled water, were also analyzed. Finally, by determining key parameters, such as the mass flow rate and temperature of the chilled water in accordance to theneed in a real project, the temperature distribution of the pool water was examined using both computational fluid dynamics (CFD) simulation and theoretical calculation. The results showed that when the temperature of the chilled water was 17 ℃ the theoretical minimum flow was calculated as 83.67 t/h. After 6–7 months, the average temperature of the water in the pool could reach the steady-state temperature of 22.44 ℃. |
| Key words: temperature stability lumped parameter method CFD simulation heated sphere parameters of chilled water |
