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暖通空调杂志社>期刊目次>2017年>第10期

低温热水盘管供暖床系统散热特性研究

Heat dissipation characteristics of coil heating bed system using low temperature hot water

王登甲 陈澎浩 刘艳峰 刘加平
西安建筑科技大学

摘要:

提出了一种低温热水盘管供暖床系统,通过分析床系统的传热机理,建立了其热过程的数学模型。利用数值模拟和实验相结合的方法,研究了盘管管径、盘管间距、运行水温等设计参数对床系统散热特性的影响。结果显示:运行水温对床体散热影响最大,盘管管径和间距影响较小;床系统在昼间加热、夜间加热和停止加热达到散热稳定状态所需时间分别为1,2,10 h;床系统在昼、夜间的最大散热量分别为308,36 W/m2。数学模型的数值计算结果与实测结果误差在6%以内,准确度满足要求。

关键词:低温热水,盘管,供暖床,散热特性,运行水温,数值模拟,实验验证

Abstract:

Proposes a coil heating bed system using low temperature hot water. Analyses the heat transfer mechanism of the bed system, and establishes a mathematical model for the thermal process. Using a method of numerical simulation combined with experiment, studies the effect of the design parameters, including coil pipe diameter, coil pipe spacing and operating water temperature, on the heat dissipation characteristics of the system. The results show that the operating water temperature has the dominant effect on the heat dissipation, and the pipe diameter and spacing of the coil have less effect. The bed system needs 1 h, 2 h, 10 h to reach the steady state in a period of daytime heating, nighttime heating and discontinue heating, respectively. The maximum heat dissipating capacity of the bed system during the day and night are 308 W/m2 and 36 W/m2, respectively. The error between numerical calculation results and test results is within 6%, which meets the requirement of accuracy.

Keywords:lowtemperaturehotwater,coil,heatingbed,heatdissipationcharacteristic,operatingwatertemperature,numericalsimulation,experimentalvalidation

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