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Analysis of a Water-Cooled Unit under Different Loads

Fluid Dynamics & Materials Processing 2023年第7期19卷 1863-1873页

作者： Daoming Shen Jinhong Xia Chao Gui Songtao Xue Xinxiang University Xinxiang453000China Department of Architecture Tohoku Institute of TechnologySendai982-8577Japan

In order to ensure the safe operation of the compressors used in water chillers,in the present study some interlock protections have been added to the related *** include a low pressure protection,a high pressure protection,an exhaust temperature protection and a differential pressure *** tests have been conducted by tuning the saturation suction and exhaust temperatures of the compressor through adjustment of the cold source outlet temperature and the ambient *** results show that the ambient temperature increases with decreasing device load and increasing fan speed under the same saturated suction temperature;the device refrigerating capacity steps up with augmenting load and dropping saturation exhaust temperature,while it is not greatly affected by the fan ***,the Energy efficiency ratio(COP)decreases with the rise of the saturation exhaust *** parameter is not affected much by the device load and fan speed at high saturation exhaust temperature,while it improves on increasing the device load and decreasing the fan speed at low saturation exhaust temperature.

关键词： Ambient temperature cold source temperature refrigerating capacity Energy efficiency ratio(COP) fan speed load

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Sensitivity analysis on parameter changes in underground mine ventilation systems

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Journal of Coal Science & Engineering(China) 2011年第3期17卷 251-255页

作者： LI Gary KOCSIS Charles HARDCASTLE Steve Mining and Mineral Sciences Laboratories Natural Resources Canada Sudbury P3E 5P5 Canada

A more efficient mine ventilation system, the ventilation-on-demand （VOD） system, has been proposed and tested in Canadian mines recently. In order to supply the required air volumes to the production areas of a mine, operators need to know the cause and effect of any changes requested from the VOD system. The sensitivity analysis is developed through generating a cause and effect matrix of sensitivity factors on given parameter changes in a ventilation system. This new utility, which was incorporated in the 3D-CANVENT mine ventilation simulator, is able to predict the airflow distributions in a ventilation network when underground conditions and ventilation controls are changed. For a primary ventilation system, the software can determine the optimal operating speed of the main fans to satisfy the airflow requirements in underground workings without necessarily using booster fans and regulators locally. An optimized fan operating speed time-table would assure variable demand-based fresh air delivery to the production areas effectively, while generating significant savings in energy consumption and operating cost.

关键词： sensitivity factors ventilation system airflow branch resistance fixed quantity fan speed

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