• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International journal of green energy >Experimental energy and exergy analyses of a discharging heat exchanger for a small hot-oil domestic storage tank
【24h】

Experimental energy and exergy analyses of a discharging heat exchanger for a small hot-oil domestic storage tank

机译：小型热油家用储罐排气热交换器的实验能量和火用分析

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Experiments are described to investigate the thermal performance of a discharging heat exchanger for a small storage tank filled with oil. Experimental results are presented in terms of the discharging energy rates (power) and the discharging exergy rates for low (similar to 4ml/s) and high discharging flow rates (similar to 8ml/s). Water heating energy rates, which are respectively maximized at approximately 600W and 1200W at low and high flow-rate discharging, are found to be higher than the discharging energy rates, which are respectively maximized at 450W and 900W. These results indicate that the energy rates do not accurately evaluate the thermal performance of the discharging heat exchanger since the energy heating rate of the water is greater than that for the oil that heats it, which is thermodynamically inconsistent. The energy rates should thus be used with caution when the thermal performance of the heat exchanger is evaluated. Water heating exergy rates, which are respectively maximized at approximately 45W and 130W at low and high flow-rate discharging, are generally smaller than the discharging exergy rates, which are respectively maximized at 65W and 170W. Exergy rate results are thus more consistent in the physical process of water heating, and an exergy factor is suggested as a proper measure for evaluating the performance of the discharging heat exchanger. The maximum value of the exergy factor is found to increase from 0.15 at low flow rates to a maximum value of approximately 0.19 at high flow rates. This implies that to extract more energy from a storage tank to a discharging heat exchanger, the flow rate has to be high, which is consistent with the physical process of heating water faster to higher temperatures. The exergy factor can thus be used as a design parameter for discharging heat exchangers.
机译：描述了一些实验，以研究用于装有油的小型储油罐的排放热交换器的热性能。实验结果以放电能量速率（功率）和低（大约4ml / s）和高放电流量（大约8ml / s）的放电能级速率表示。发现在低流量和高流量下分别以大约600W和1200W最大化的水加热能量速率高于分别在450W和900W下最大化的放电能量速率。这些结果表明，由于水的能量加热速率大于加热它的油的能量加热速率，因此能量速率无法准确地评估排放热交换器的热性能，这在热力学上是不一致的。因此，在评估热交换器的热性能时，应谨慎使用能级。在低流量和高流量下分别以约45W和130W最大化的水加热本能率通常小于分别在65W和170W时最大化的放热率。因此，火用率的结果在水加热的物理过程中更加一致，建议使用火用因子作为评估排放热交换器性能的适当措施。发现火用因子的最大值从低流量时的0.15增加到高流量时的约0.19的最大值。这意味着要从储罐向排放热交换器提取更多的能量，流量必须很高，这与将水更快加热到更高温度的物理过程相一致。因此，火用因子可以用作排出热交换器的设计参数。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号