Transcript Proposal Presentation.ppt

Analysis of
Ground Coupled Heat Exchanger Efficiency
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.
• A ground coupled heat exchanger can be used
in either a heating or cooling mode by taking
advantage of a “near constant” ground
temperature.
• The “near constant” ground temperature can be
used as either a heat sink to remove heat to cool
a building or as a heat source to heat a building.
Problem Description
• Analyze the efficiency of 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 will be performed to determine the outlet
temperature and efficiency based on varying inlet and
exterior temperatures.
Methodology/Approach
• This study will use an analytical and numerical approach to
analyze the efficiency of a ground coupled heat exchanger.
• Heat transfer analysis will involve the use of conservation of
energy, the heat transfer rate equation, and the evaluation of
the total thermal resistance between the two fluids (i.e.,
between the air or other fluid and the ground).
• 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.
Resources Required
• The resources required for the complete of this project
are including, but not limited to, the use of the following
textbooks:
–
–
–
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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.
Expected Outcome
• The expected outcome for this project is 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.
• This analysis will be used to determine what is
the optimal ground coupled heat exchanger
design based on the efficiency of the system.
Milestones/Deadlines
Deadline
Milestone
9/30
Complete Project Proposal
9/30
Start COMSOL simuation
10/7
Complete Open Loop – Single Pass Calculation for Air
10/9
Complete Open Loop – Multiple Pass Calculation for Air
10/14
Complete Closed Loop – Single Pass Calculation for Air
10/16
Complete Closed Loop – Multiple Pass Calculation for Air
10/18
Analyze/Compare Calculations for Air
10/20
Post Process First Progress Report
10/21
Complete First Progress Report
10/26
Complete Open Loop – Single Pass Calculation for Second Fluid
10/28
Complete Open Loop – Multiple Pass Calculation for Second Fluid
11/2
Complete Closed Loop – Single Pass Calculation for Second Fluid
11/3
Complete Closed Loop – Multiple Pass Calculation for Second Fluid
11/4
Analyze/Compare Calculations for Second Fluid
11/11
Complete Second Progress Report
11/18
Complete COMSOL Simulation
11/26
Analyze/Compare COMSOL Simulation with Calculation Performed for the Two Other Fluids
12/2
Complete Final Draft
12/16
Complete Final Report