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提出用数学期望的方法确定热水供暖系统设计计算中所采用的重力水头系数。根据冬季室外温度的平均延续小时数,计算了我国部分城市供暖期重力水头系数的数学期望E[B]。结果表明:1)E[B]与地域有关;2)供暖系统的运行调节方式对E[B]有显著影响;3)在供回水温差相等的情况下,供回水温度对E[B]基本上无影响。给出了部分城市重力水头系数的推荐值。引入整个供暖期重力水头标准差检验了采用本文推荐的重力水头系数比采用现行规范中给出的重力水头系数更合理。
The method of mathematical expectation is proposed to determine the gravity head coefficient used in the design calculation of hot water heating system. According to the average outdoor hours in winter, the mathematical expectation E [B] of gravity head coefficient in the heating period of some cities in China was calculated. The results show that: 1) E [B] is related to the area; 2) The mode of operation regulation of heating system has a significant effect on E [B]; 3) In the case of equal supply and return water temperature, Basically no effect. The recommended values of some city gravity head coefficients are given. The introduction of the standard deviation of the gravity head during the heating period tests that the gravity head coefficient recommended by this paper is more reasonable than the gravity head coefficient given in the current code.