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Toward optimal secondary furnace heat exchangers: performance validation of high temperature tube calorimeter.

Number: 2329

Author(s) : DEVLIN S., PARK H., COOK J., NGUYEN T., BOARD A., BACH C. K., ALEXANDER A.

Summary

The growing sense of urgency surrounding carbon emissions has exacerbated the need for HVAC solutions that are energy efficient, cost-effective, and environmentally friendly. In North America, most households rely on a central furnace for heating, so serious time and effort is invested into optimizing these appliances. Currently, secondary furnace heat exchanger development teams lack the heat and mass transfer correlations necessary for accurate performance modeling, requiring costly experimental iterations and leading to suboptimal design. Furnace secondary heat exchangers operate at inlet temperatures upwards of 350°F at dew points above 100°F, increasing the difficulty reaching and replicating steady state conditions of the flue gas during calorimetric testing of individual tubes. The purpose of this project is to address these challenges through the development, construction, and testing of a calorimeter that can accurately simulate the flue gas conditions entering the secondary heat exchanger in a typical residential furnace. The system will acquire temperature and condensate mass flow rate data to perform an energy balance across the test section. The collected data will then be used to tune heat and mass transfer (HMT) correlations for a range of levels of the parameters mass flow rate, tube diameter, inlet humidity, and inlet temperature. A parallel effort has resulted in a CFD simulation pipeline that automatically configures and simulates a wide variety of additional parameter levels, increasing the level of fidelity of the data to further refine the HMT correlations. To that end, it is expected that the experimental data will serve as validation data with future work being heavily focused on CFD.

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  • Original title: Toward optimal secondary furnace heat exchangers: performance validation of high temperature tube calorimeter.
  • Record ID : 30030659
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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