这是一组四篇论文中的第四篇，其中描述了温莎大学（L，2）在ASPRAE研究项目RP140下进行的工作，II两相热虹吸回路性能特征的发展”（3）。第一篇论文（4）涉及倾斜管中的冷凝，第二篇论文（5）涉及实验研究，第三篇论文（6）随着本研究所用计算机程序的发展。该程序能够模拟任何热虹吸回路的性能，如图1所示。本文介绍了一些回路模拟的结果，这些模拟是为了说明热虹吸回路在各种参数改变时的典型行为。根据系统应用的性质，模拟结果分为两组。第一组结果适用于一个换热器的标高低于另一个换热器的情况，从而产生一个回路，该回路在一个方向（标高较低的热源）传递热量非常好，而在另一个方向（标高较高的热源）传递热量非常差。 这种回路将被称为单向回路。第二组结果适用于两个换热器处于相同高度的情况，从而产生一个在两个方向上都工作良好的系统。这种环路将被称为双向环路。为了关注回路本身的性能，而不是特定系统的性能，通过指定蒸发器和冷凝器管表面温度，消除了蒸发器和冷凝器管外部传热性能的影响（由于散热片和空气流速等）。因此，报告的电导代表内环电导。该值的倒数表示回路本身对热流的阻力。引文:阿什雷学报，第83卷，第2部分，哈利法克斯，北卡罗来纳州

This is the fourth of a set of four papers which describe the work carried out at the University of Windsor (l, 2) for ASHRAE under Research Project RP-140, IIDevelopment of Performance Characteristics of Two-Phase Thermosiphon Loops" (3). The first paper (4) deals with condensation in inclined tubes, the second (5) with the experimental study and the third (6) with the development of the computer program used in this study. This program is capable of simulating the performance of any thermosiphon loop such as that shown in Fig. 1.This paper presents the results of a number of loop simulations which were carried out to illustrate typical behavior of thermosiphon loops as various parameters are changed. The simulation results have been divided into two sets depending upon the nature of the application of the system. The first set of results is for the case where one exchanger is at a lower elevation than the other thereby producing a loop which will transfer heat very well in one direction (source at lower elevation) and very poorly in the other direction (source at higher elevation). Such loops will be referred to as unidirectional. The second set of results is for the case where both heat exchangers are at the same elevation thereby producing a system which works equally well in either direction. Such loops will be referred to as bidirectional.In order to focus on the performance of the loop itself rather than a specific system, the effect of the exterior heat transfer performance of the evaporator and condenser tubes (due to fins and air flow rates, etc.) was eliminated by specifying the evaporator and condenser tube surface temperatures. Thus the conductances reported represent the internal loop conductance. The reciprocal of this value would represent the resistance to heat flow due to the loop itself.