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Ice Pile Air Conditioning

Ice Pile Air Conditioning. Joseph Cooper: Project Lead Kylie Rhoades, Clara Echavarria, Jonathon Locke, Alex Gee. Agenda. Background Problem Statement (Input on EER table) Customer Needs Functional Decomposition Specifications/Constraints/Given Concept Experiment

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Ice Pile Air Conditioning

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  1. Ice Pile Air Conditioning Joseph Cooper: Project Lead Kylie Rhoades, Clara Echavarria, Jonathon Locke, Alex Gee

  2. Agenda • Background • Problem Statement (Input on EER table) • Customer Needs • Functional Decomposition • Specifications/Constraints/Given • Concept Experiment • Concept Development (Input on alternate designs) • Concept Decision • Heat Exchanger Calculations (Input on inlet temperatures) • Initial Visual Representation of Unit Design

  3. Project Background and Summary • RIT has a goal of becoming carbon neutral by 2030 and a continuous vision of campus expansion. • RIT will soon be the home of a brand new ice arena as well as the current home of Ritter Arena. • Mission: Design a method to extract the cooling energy from a volume of ice (generated from an ice rink) effectively and efficiently. • On a game day at an ice rink, there are approximately 5 Zamboni “dumps”, summing up to 500 ft3 (14.15 m3) • On a typical day of operation, 100 ft3 (2.83 m3) is discarded. • According to a density test, this will weigh approximately 2000 kg per load or 10,400 kg on a game day (per 5 loads)

  4. Problem Statement • Create a testing unit to which will demonstrate the feasibility of obtaining a cooling capacity from waste ice. This small scale proof-of-concept will be in the form of an air cooling unit. • This testing unit is to be comparable (ideally found much better) to cooling efficiencies of a typical water or evaporative cooled condensing unit with a COP of 3.8 • http://www.centerpointenergy.com

  5. Equal to a COP of 3.8

  6. Customer Needs

  7. Functional Decomposition Tree

  8. Specifications and Constraints

  9. Preliminary Concept Experiment • Purpose: • Suspicion of creating an air gap around a pipe is thought of in theory • Run test to find if we are able to have a vertical heat exchanger pipe in the ice box, and observe ice behavior during melting in this case. • After about 35 minutes:

  10. Concept Development

  11. Concept One

  12. Concept Two

  13. Concept Three

  14. Concept Risk Assessment for Selection

  15. Selected Path for Design: Concept 2 • Concept 2 includes benefits from both 1 and 3. • Can be fitted with a heat exchanger (Concept 1) if needed for appropriate cooling. • Heat exchanger will require: • Design • Lead Time • Budget/Cost

  16. Coolant to Air Heat Exchanger Background: • Initial calculations are done with copper tubing • Future plans are to use a finned radiator • Coolant has been chosen as water • Air is to be moved evenly by 2 DC fans with flow rates required by radiator • Pump to be sized based on radiators and associated head losses

  17. Cross-Flow Heat Exchanger Cross Flow = Air Tube Flow = Water

  18. Given parameters for Initial Hx: • Water Inlet Temperature = 0°C • Qwater = 1 gpm • Air Inlet Temperature = ~30°C • Air Flow Rate = 105.9 CFM or 3 m3/min • ½” Copper Tubing

  19. Prototype Output • Assume: • Pure Ice at 0oC • 5 gallon tank • 3.5 gallons of ice • 1.5 gallons of H2O • 300,000 J/kg latent heat of ice • 917 kg/m3 density of pure ice • 736 kg/m3 experimental density of Zamboni shaved ice • 2773 BTU storage in Zamboni Ice • 3992 BTU/hr Cooling Load of Heat Exchanger • 45 Minutes of Run Time

  20. Copper Tube Heat Exchanger Results Total Cooling Load= 1.08 KW or 3692 BTU/hr Required length of ½” diameter tubing= 96 ft Tubing Layout: • 15” of straight tube • 1.5” diameter elbows • 1” gap between tubes Tubing section (HeightxWidthXDepth)=16.5”x3.5”x.5” Total Size (HeightxWidthXDepth)= 16.5”x19.375”x8”

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