Based on the analysis of numerous piping engineering finished,a calculation formula is proposedfor predicting the pressure drop of the piping system,and an algorithm is drawn for expressing the rela-tionship of flowrate-density-pipe diameter-friction factor (or complexity factor),by which the pressuredrop prediction become more quicker and simpler.
通过对大量已完成管道工程的分析研究，提出了一个预测管路系统压降的计算公式，并据此制成了流量－密度－管径－摩擦因数（或复杂因子）关系算图，使压降预测更为迅速、简捷。
Since the calculating formulas of heat pipe exchanger are complicated and the physical parameters of the working medium at different temperature need to be calculated, a nomographic method for the calculation of gas-gas heat pipe exchanger is presented.
针对热管换热器设计计算公式复杂,计算工作量大的问题,提出了采用线算图法进行气气热管换热器设计计算的方法。
One dimensional, unstable heat transfer quick calculation chart of poly(vinyl chloride) is determined.
以PVC板材为基础 ,研究了其一维不稳定传热速算图的确定 ,它既是普通速算图的一部分 ,又增加了实用性和计算的方便性。