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Modeling and experimental analysis of interlaced hot glycol defrost system.

Number: 2340

Author(s) : DENIZLI H., ZABUN M., YORUK B.

Summary

There are several methods available for defrosting or deicing the surfaces of heat exchangers in cold rooms. One of these methods is interlaced glycol (brine) defrost system, where hot liquid is circulated through a separate circuit within the evaporator to facilitate the defrosting process. In this study, a mathematical model has been developed to analyze interlaced brine defrost. Experimental results show that developed model is predicting key defrost parameters very well. Besides, based on the existing literature, the performance and duration of interlaced glycol defrost are aimed to be predicted. This method, which consists of one main loop and two sub-routines, determines the exit temperature of glycol through an iterative approach. Ultimately, the glycol mass flow rate is determined, allowing glycol to enter the tray at the desired temperature and exit the coil at the required temperature. To validate the developed methodology, a prototype is manufactured and placed in a test chamber. Numerous tests had been conducted under various conditions to verify the methodology's accuracy. To validate this methodology, tests were conducted at four different Reynolds numbers. These Reynolds numbers were selected to represent three different flow regimes (laminar, transition, and turbulent). Based on the results of these experiments, methodology’s performance under different flow regimes has been observed. As a result of the comparisons made, it has been observed that the experimental data is consistent with the mathematical model.

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  • Original title: Modeling and experimental analysis of interlaced hot glycol defrost system.
  • Record ID : 30033172
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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