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Analysis of A Ground Coupled Heat Exchanger

Analysis of A Ground Coupled Heat Exchanger. Brett Walsh Master of Engineering In Mechanical Engineering Rensselaer Polytechnic Institute at Hartford. Introduction/Background. Improve the efficiency of heating, ventilation and air conditioning (HVAC) systems.

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Analysis of A Ground Coupled Heat Exchanger

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  1. Analysis ofA Ground Coupled Heat Exchanger Brett Walsh Master of Engineering In Mechanical Engineering Rensselaer Polytechnic Institute at Hartford

  2. Introduction/Background • Improve the efficiency of heating, ventilation and air conditioning (HVAC) systems. • A ground coupled heat exchanger can be used in either a heating or cooling mode by taking advantage of a “near constant” ground temperature.

  3. Problem Description • Analyze a ground coupled heat exchanger in an effort to optimize an already efficient design. • Analysis will be performed for a ground coupled heat exchanger that utilizes the following • Open and/or Closed loop • Single or multiple passes • Multiple fluids • Calculations were performed to determine the required length of underground pipe based on a specified outlet temperature with varying inlet temperatures.

  4. GCHE Loops

  5. Methodology/Approach • This study will use an analytical and computational approach to analyze a ground coupled heat exchanger. • Heat transfer analysis will involve the use of the following equations: • Conservation of Energy • Heat Transfer Rate Equation • As well as, an evaluation of the total thermal resistance between the two fluids (i.e., between the air and/or ethylene glycol and the ground).

  6. Methodology/Approach • The two common methods: • Log Mean Temperature Difference (LMTD) • Effectiveness-NTU (ε-NTU) • LMTD method will be used to optimize the various ground coupled heat exchangers designs and analyze their efficiency.

  7. Resources Required • The resources required for the complete of this project are including, but not limited to, the use of the following textbooks: • Introduction to Thermodynamic and Fluids Engineering • Convective Heat and Mass Transfer • Fundamentals of Engineering Thermodynamics • Transport Phenomena • Microsoft Office and COMSOL Multiphysics will be used for analysis, post processing, and compilation.

  8. Analytical Analysis • The Open Loop Ground Couple Heat Exchanger draws outside air underground to be heated or cooled, depending on the temperature, to a temperature of 55°F. The length of pipe required to achieve an outlet temperature of 55°F for varying inlet temperatures.

  9. Computational Analysis • Computational analysis was performed at 4 different temperatures for air and ethylene glycol. Analysis was performed at 4.0, 50, 90, and 95°F (-15.54, 10, 32.75, and 34.9°C) for air. Similar analysis was performed for ethylene glycol at 54.04, 54.129, 55.127, and 56.39°F (12.245, 12.294, 12.849, and 13.547°C). The specific temperatures above were used since they are the maximum and minimum temperatures for both the open and closed loops.

  10. Computational Analysis

  11. Results • The goal of this project was to have a complete analysis of a ground coupled heat exchanger that utilizes an open and/or closed loop, that is either a single or multiple pass heat exchanger and that uses of different fluids in the system. Analysis was performed to determine what is the optimal ground coupled heat exchanger design is. • Based on the results of the analysis, a closed loop ground couple heat exchanger with ethylene glycol and a secondary heat exchanger between the ethylene glycol and air, achieved the required outlet temperatures for both ethylene glycol and air. The temperatures were accomplished using the least amount of pipe.

  12. Milestones/Deadlines

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