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Ohio State’s High-Rise Residence Hall Renovations with Geothermal Well Field

Ohio State’s High-Rise Residence Hall Renovations with Geothermal Well Field. Tom Reeves, Director Jeffrey Roe, Senior Energy Engineer. Office of Student Life. Business Reasons: Quarters to Semester Switch -Late September through mid-June -Now: Mid August move-in (HOT!)

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Ohio State’s High-Rise Residence Hall Renovations with Geothermal Well Field

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  1. Ohio State’s High-Rise Residence Hall Renovations with Geothermal Well Field Tom Reeves, Director Jeffrey Roe, Senior Energy Engineer

  2. Office of Student Life • Business Reasons: • Quarters to Semester Switch • -Late September through mid-June • -Now: Mid August move-in (HOT!) • Additional capacity needed

  3. Office of Student Life • This project added ~250 new beds and renovated the spaces for ~2150 existing beds. • These residence halls now have air conditioning, new restrooms, new lobby spaces and courtyard

  4. Office of Student Life West: ~1900 North: ~4100 (~7000 in Autumn 2017) South: ~5900

  5. Office of Student Life • “South High-Rise” (SHR for short) • These are 5 individual 11 story buildings built in the 1950s – heating only without outside air. • Rooms designed for doubles and triples with corridor bathrooms • Typical old floor plan:

  6. Office of Student Life • Major renovation included: • Insulation – Walls ~R3 to ~R18 • Air Conditioning – Using “Valence” units. • Upgraded windows - operable aluminum frame • Privatized Bathrooms • Additional Programming Space • (Study Rooms, Lounges, Courtyard) • Typical new floor plan:

  7. Office of Student Life 264 wells, 3 vaults Plant “Bunker” location 145 wells, 1 vault

  8. Office of Student Life

  9. Office of Student Life Move in Day 2013 This is the second year for Park-Stradley (pictured) This is the first year for Smith-Steeb and Siebert

  10. Office of Student Life • Design Decisions - Geothermal • Pros of Geothermal System: • Expected long lifespan of energy savings • Upfront costs relatively low due economic conditions at the time • GREAT PR • Cons: • Requires fencing off significant green space for several years for construction

  11. Office of Student Life Marketing Material Posters on fencing around construction

  12. Office of Student Life

  13. Office of Student Life

  14. Office of Student Life • Geothermal Well Field Design • 411 wells at 550 feet deep • 4 underground “vaults” for isolating branches of wells • (7-13 wells/branch) • Plastic piping used, tracing wires • Designed for 1500 tons of cooling, expecting more for heating.

  15. Office of Student Life

  16. Office of Student Life

  17. Office of Student Life

  18. Office of Student Life

  19. Office of Student Life • Design Decisions - Fan-Coils vs. Valance • Pros of Valance Units: • No fan – no electrical use (other than valve) • No filter • No floor space loss • No refrigerant near student quarters • Cons: • Takes up ceiling space • May require higher water temperatures to provide circulation to heat the room – 150F recommended by our design engineer

  20. Office of Student Life • Valance • Computational Fluid Dynamic Model

  21. Office of Student Life • Valance • CFD Model

  22. Office of Student Life • Design Decisions - Large Heat Pumps • Reasoning: • We used this system on a much smaller installation, the 510 person dorm “Residence on 10th, which received LEED Gold. • Residence on 10th has been operating satisfactorily • The output of the chillers is only 130F here, where fan coils are used, which allowed for different choices in heat pump selection

  23. Office of Student Life • Design Decisions - Large Heat Pumps • Requirements: • Large equipment allows for refrigerant risk mitigation – minimal HVAC refrigerant lines near student areas • Condenser side must be able to produce 150F water for best operation of the valance • This requirement drove the decision to between two pieces of equipment • York CYK • Multistack Packaged Scroll • Steam remains as backup system

  24. Office of Student Life Multistack Pro • Better turndown / part loading Con • Large footprint (many units needed) York CYK Pro • Small footprint Con • Limited turndown, especially heating mode

  25. Office of Student Life York CYK Chosen for smaller footprint Constant 42F/150F or floating either point

  26. Office of Student Life

  27. Office of Student Life

  28. Office of Student Life Windows Triple Glazed, Low E South and West SHGC: 0.24 U-Value: 0.12 = R-Value of 8 North and East SHGC: 0.35 U-Value: 0.12 = R-Value of 8

  29. Office of Student Life • Design Decisions - Other Considerations • 2-Pipe risers – Only heating or cooling provided • Did not include bypass at end of each loop – dead ends, but valance units flush this water within a few minutes. • Lack of simultaneous heating and cooling uses far less energy • Outside air to hallways and out bathrooms • No direct outside air to student rooms – requires operable windows. • Window sash sensors not installed – no ability to cut cooling/heating out with windows open.

  30. Office of Student Life

  31. Office of Student Life • 2012-2013 School Year Results • Park-Stradley was lived in. Plant provided heating and cooling to Smith-Steeb and Siebert as well, as they were under renovation. • Plant Steam (York CYK not running until spring): 13,700 x 10^6 BTU • Plant kWh: 1.5M kWh • Park-Stradley kWh: 1.7M kWh • Smith-Steeb and Siebert kWh (under construction): 1.0M kWh

  32. Office of Student Life No Students

  33. Office of Student Life • Example Operating Points – 11:30 9/4/13 • Commissioning is NOT complete yet • Student Capacity Cooled: 2400 students • OAT: 71F • Chiller EEFT/ELFT/Flow 49.6/43.3/1370 (360 tons) • Chiller kW / kW/ton 788kW / 2.2 kW/ton • Secondary Chilled Water • SCWS / SCWR / Flow: 46/50/2060 (backflow in bypass sends warmer water to valances, which work fine at higher temperatures)

  34. Office of Student Life • Future Plans • We have (3) 800 ton heat-pump chillers and the existing load appears to max at out about 550 tons for cooling. • Heating load is unknown, but it appears to also be much below the available (3) 13.3M Btu/Hr units. • We have added piping to send heat to existing heating hot water only low rise buildings nearby – ready for this winter

  35. Office of Student Life No Students

  36. Office of Student Life Lessons Learned Keep mechanical rooms above sewer level Water main burst, flooding the chiller bunker. Much equipment needed rebuilt/replaced.

  37. Office of Student Life • Questions? • Contact • Jeffrey Roe, roe.43@osu.edu, 614-623-6048

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