论文部分内容阅读
分析了热量表的误差组成及影响误差的因素 ,并模拟计算了实际不同运行工况下热量表的最大误差 ,得出结论 :当散热器进出水温差Δt达到最小值、流量 q达到最小允许值时 ,热表误差限的最大值为 1 0 % ,随流量的增加 ,误差限逐渐降为 8% ;Δt不变时 ,流量较小误差较小 ;q不变时 ,Δt越大 ,误差越小 ,当Δt >3Δtmin时 ,误差接近常数 ;一定温差下 ,当实际流量大于常用流量的一半后 ,误差近似为常数
The error composition and the factors affecting the error of the heat meter are analyzed. The maximum error of the heat meter under different operating conditions is simulated. The conclusion is drawn that when the temperature difference Δt between the heat exchanger and inlet reaches the minimum, the flow rate q reaches the minimum allowable value , The maximum value of the error limit of the heat meter is 10%, and the error limit is gradually reduced to 8% with the increase of the flow rate. When the Δt is constant, the smaller the error of the flow rate is smaller. When q is constant, Small, when Δt> 3Δtmin, the error is close to constant; Under a certain temperature difference, when the actual flow rate is greater than half of the commonly used flow, the error is approximately constant