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首页> 外文期刊>International Journal of Heat Exchangers >Thermal Performance Evaluation of Closed Air Circuit Aircooled (CACA) Heat Exchangers for High Rated Electrical Motors - A Case Study
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Thermal Performance Evaluation of Closed Air Circuit Aircooled (CACA) Heat Exchangers for High Rated Electrical Motors - A Case Study

机译：高额定值电动机的闭路空气冷却（CACA）热交换器的热性能评估-案例研究

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摘要

The thermal performance of the Closed Air Circuit Aircooled (CACA) cross flow heat exchanger associated with large electrical motors has been analyzed. The Heat exchanger is divided into four parts according to its flow rates. The intermittent temperatures of the exchanger are estimated through network analysis. This analysis reveals that the heat exchanger is under performing according to the design specifications, such as flow rates of both the fluids and its inlet temperatures, and given surface geometry. The effectiveness of the exchanger is about 61%. The difference between design capacity, 78.0 kW, and actual heat dissipation rate, 48.02 kW, is due to lower air flow rates on both sides of the exchanger. To make use of the exchanger effectively, the flow rates of air should be properly supplied to meet the specified thermal capacity of the heat exchanger. The performance of exchanger is also evaluated at various air flow rates of both the cold fluid as well as hot fluid. The software developed can also be used to predict the performance of the exchanger as a whole and as a function of number of tube rows.
机译：分析了与大型电动机相关联的封闭空气循环风冷（CACA）错流热交换器的热性能。热交换器根据其流量分为四个部分。交换器的间歇温度通过网络分析估算。该分析表明，热交换器正在按照设计规范运行，例如流体的流速及其入口温度以及给定的表面几何形状。交换器的效率约为61％。设计容量78.0 kW和实际散热率48.02 kW之间的差异是由于交换器两侧的空气流速较低。为了有效地利用交换器，应适当供应空气流量，以满足热交换器的规定热容量。在冷流体和热流体的各种空气流速下，也要评估交换器的性能。开发的软件还可以用来预测交换器的整体性能，并作为管排数量的函数。

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