在九个不同的双管冷凝器内，采集了R-113冷凝过程中的传热和压降数据。R-113在内管内冷凝，冷却水在环空中流动。冷凝器分为三组，每组三个冷凝器。在每组中，每个冷凝器的内管外径相同。然而，在一个冷凝器中，内管内部有内部翅片，外部有光滑表面（a型）。在第二个冷凝器中，内管外表面有滚花，内表面光滑（b型）。在第三个冷凝器中，内管内部有与第一个冷凝器相同的散热片，外部有与第二个冷凝器相同的滚花（c型）。这根管子被称为双增强管。 三组冷凝器的内管外径和翅片几何参数不同。通过比较总电导（UA）的实验值，对带有a、b和c型内管的试验冷凝器的性能进行了评估。在固定的内管几何形状、相同的冷却水流量和入口温度以及相同的R-113入口冷凝压力的约束下，对不同的冷凝液流量进行了比较。根据这些结果，有可能确定在冷凝器设计中使用t~e内管单次增强（内部或外部）与双次增强的有利条件。单位:双引文:研讨会，ASHRAE交易，1988年，第卷。 94磅。2、渥太华

Heat transfer and pressure drop data were taken during condensation of R-113 inside nine different double-pipe condensers. R-113 was condensed inside the inner tube and the cooling water flowed in the annulus. The condensers were divided into three sets with three condensers in each set. Within each set, the inner tube of each condenser had the same outside diameter. However, in one condenser the inner tube had internal fins on the inside and a smooth surface on the outside (type a). In the second condenser, the inner tube had knurls on the outside surface and a smooth surface on the inside (type b). In the third condenser, the inner tube had the sane fins as the first condenser on the inside and the same knurls as the second condenser on the outside (type c). This tube is identified as a doubly augmented tube. The three sets of condensers differed in the outside diameter of the inner tube and the fin geometric parameters. The performance of the test condensers with inner tubes of types a, b, and c was evaluated by comparing the experimental values of the overall conductance (UA). The comparisons were made under the constraints of fixed geometry of the inner tube, the same cooling water flow rate and inlet temperature, and the the same inlet condensation pressure of R-113, for different flow rates of the condensing fluid. On the basis of the results, it was possible to identify the favorable conditions under which it is desirable to use single augmentation (inside or outside) versus double augmentation of t~e inner tube in condenser design.Units: Dual