downstream

Derived in the paper are mathematical models of heat and mass transfer for parallel flow type and counterflow type closed wet cooling tower(CWCT).

建立了顺流式、逆流式闭式冷却塔(CWCT)热质交换的数学模型,采用四阶Runge-Kutta方法对一小型冷却塔进行了数值计算,并将计算结果与试验值进行了比较。

The temperature changing rules of counter and parallel flow, including phase changing flow are given after theoretical analysis using the principle of heat transfer.

运用传热学基本原理进行理论分析,得出了顺流及逆流的单相流流动以及含有相变过程的两相流流动温度沿程变化规律;归纳了冷热流体沿程温度变化曲线斜率的特点,证明逆流流动温度沿程变化曲线的凸凹形状取决于比热容和流量乘积的相对大小。

By the analysis and comparison between the parallel flow mode and the counter - flow mode used in heat exchangers of the R407C room air conditioner, the paper points out that counter -flow mode has a better performance of the heat transfer than that ot the parallel flow mode.

本文通过对R407C制冷剂房间空调器换热器分别采用顺流和逆流两种布置方式的定性、定量分析和比较,指出,采用逆流布置方式能够强化换热器的换热性能,而且,换热器排数越多,采用逆流布置方式也就更容易接近真正的纯逆流,换热能力提高的幅度也就越大。

Model calculation and analysis of heat and mass transfer of air and water in a direct contact forward flow;

空气与水顺流直接接触热质交换过程模型计算及分析