Fin-and-tube heat exchangers can have active circuits directly adjacent to inactive circuits at part load conditions, leading to cross-fin conduction. Cross-fin conduction needs to be accounted for in heat exchanger modelling to accurately predict heat exchanger performance. This study explores how refrigerant circuitry can influence cross-fin conduction in multi-circuit evaporator coils. Our advanced segment-by-segment heat exchanger model is validated against two-phase refrigerant data obtained from our experimental facility. Three, custom designed, multi-circuit fin-and-tube heat exchanger coils with distinct circuities were used for validation purposes, including an interleaved, vertical and block circuited coils, respectively. A total of 162 experiments with several refrigerant and air inlet conditions, at full load (all circuits active) and part load (some circuits active) were carried out. At full load, for all coils, differences in coil capacity between simulated and experimental capacities were no greater than 10%, for part load the differences are larger. For the test coil with interleaved circuitry, operating with 3 of 8 circuits active, the mean average percentage error (MAPE) between experimental and simulated capacity was 2.7% when cross-fin conduction was considered, increasing to 7.7% when it was ignored. Similarly, for test coil with block circuitry, operating with 2 out of 4 circuits active, the MAPE between experimental and simulated capacity was 1.7% when cross-fin conduction was considered, and 3.4% when ignored. Results suggest that the effect of cross-fin conduction on coil capacity is directly proportional to number of inactive circuits, and it is more pronounced on interleaved circuitry compared to block circuitry.

在部分负载条件下，翅片管式换热器可以具有与非活动回路直接相邻的活动回路，从而导致交叉翅片传导。在换热器建模中需要考虑交叉翅片传导，以准确预测换热器性能。本研究探讨了制冷剂回路如何影响多回路蒸发器盘管中的交叉翅片传导。我们先进的逐段换热器模型已根据从我们的实验设施获得的两相制冷剂数据进行了验证。三个定制设计的、具有不同电路的多回路翅片管式换热器盘管用于验证目的，分别包括交错、垂直和块状回路盘管。共有 162 次实验，具有多种制冷剂和空气入口条件，在满载（所有电路都激活）和部分负载（一些电路激活）下进行。在满载时，对于所有线圈，模拟和实验容量之间的线圈容量差异不大于10%，对于部分负载差异更大。对于具有交错电路的测试线圈，在 8 个电路中的 3 个处于活动状态下运行，当考虑跨鳍传导时，实验和模拟容量之间的平均百分比误差 (MAPE) 为 2.7%，忽略时增加到 7.7%。类似地，对于具有块电路的测试线圈，在 4 个电路中有 2 个处于活动状态时运行，当考虑跨鳍传导时，实验和模拟容量之间的 MAPE 为 1.7%，而忽略时为 3.4%。