Refrigeration Plant Design – Progress Report 1 Kevin W. Hunter MANE-6980 Engineering Projects

Project Objective  The purpose of this project is to design a reliable refrigeration unit suitable for both a military and non- military ship application. This will include the following: Determine size of stores required for food product based on number of personnel Create a suitable arrangement for stores (square) and minimize foot print for entire unit Calculate cooling capacity required and examine thermal heat transfer between walls to determine applicable insulation Integrate commercial components such as condensers, compressors, receiver tanks, and thermal expansion valves, control panels Simple controls for interface and plant safety Examine maintenance vs. cost trade offs for serviceability

Current Deliverable Status  Web Portfolio and 100 Word Write-up Completed Early on 9/10/10  Tentative Project Proposal Draft Completed Early on 9/22/10  Project Proposal Draft Completed Early on 9/28/10  Developed Abstract, Table of Contents, and Methodology Completed Early on 10/13/10

Current Status (continued)  Calculated Stores Size Completed on 10/16/10  First Progress Report Completed Early on 10/20/10

Stores Size  Refrigeration Unit Stores consists of two boxes  Refrigerated Space (Chill Box)  Freezer Space (Freezer Box)  Stores size based on the following:  Crew Size of 120  At Sea Time of 90 days  Assumed packing factor of 10% for contingency

Stores Size (continued)  Chill Box is approximately 234 cu-ft  Freezer Box is approximately 426 cu-ft  Developing sketch (in progress) to take into account:  Air Space to take into consideration air circulation for cooling  Thermal Break Battens  Removal Grating  Insulation  Access/Removal Panels  Door Location

Heat Load  Determining the heat load will require:  Arrangement Lay Out of Stores  Volume of Food in Boxes  Assumed Temperature Surroundings  Thickness of Wall, Ceiling, Floor  Material of Wall, Ceiling, Floor  Currently evaluating the use of stainless steel or aluminum  Added heat by the components (fans, heaters, motors, lights, compressor)  Assumed Design Temperature requirements of the Chill and Freezer Box

Additional Calculations (Near Future)  Examine thermal heat transfer between walls to determine applicable insulation  Examine wall temperatures that separates refrigeration plant, damper, and air plenum for both stores Possibility of increased insulation in local areas

Schedule/Key Milestones  10/28/10Determine Capacity required for pull down & refrigeration plant layout  11/5/10Integrate Stores & Refrigeration plant and begin heat transfer calculations  11/11/10 Submit Second Progress Report  11/18/10Finalize Calculations, moderate safety control, operation and maintenance documentation  11/30/10Finalize draft write-ups  12/2/10Submit Final Draft  12/16/10Submit Final Report

Near Term Plan  Finalize Stores Arrangement  Calculate Heat Load  Select Commercial Refrigeration Plant Components (.i.e. compressor, condenser, evaporator coils, thermal expansion valve, etc)  Develop simple human interface controls  Examine maintenance vs. cost trade offs for serviceability

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