1. Tri-Valley Jr./Sr. High School Hegins, PA Senior Thesis, Spring 2004 Studying The Feasibility of a Dedicated Outdoor Air System

2. Who Am I? Primary Faculty Advisor – Dr. Mumma Jason P. Kramer Mechanical Option Tri-Valley Jr./Sr. High School Mechanical Option Jason P. Kramer Hegins, PA

3. Outline Background Background Background Existing Conditions Existing Conditions Existing Conditions Existing Conditions Mechanical Redesign Mechanical Redesign Mechanical Redesign Mechanical Redesign Structural Implications Structural Implications Structural Implications Structural Implications Electrical Implications Electrical Implications Electrical Implications Electrical Implications Cost Analysis/Comparison Cost Analysis/Comparison Cost Analysis/Comparison Cost Analysis/Comparison Conclusions Conclusions Conclusions Tri-Valley Jr./Sr. High School Mechanical Option Jason P. Kramer Hegins, PA

4. Background Major Project Players Major Project Players Tri-Valley School District - Owner Tri-Valley School District - Owner EI Associates – Architects EI Associates – Architects Brinjac – Engineers Brinjac – Engineers Lobar, Inc – Gen. Contractor Lobar, Inc – Gen. Contractor Tri-Valley Jr./Sr. High School Mechanical Option Jason P. Kramer Hegins, PA Setting Setting Hegins, PA Hegins, PA Rural, central PA town, population 5500 Rural, central PA town, population 5500 Comprised of 450 students, grades 7-12 Comprised of 450 students, grades 7-12

5. Existing Conditions Mechanical Mechanical Four pipe water circulation system with fan coil units, unit ventilators and larger air handling units Four pipe water circulation system with fan coil units, unit ventilators and larger air handling units Two 150 Ton air-cooled rotary chillers Two 150 Ton air-cooled rotary chillers Two fuel oil fired boilers Two fuel oil fired boilers Tri-Valley Jr./Sr. High School Mechanical Option Jason P. Kramer Hegins, PA Electrical Electrical 480V/277 feed from main line into transformer 480V/277 feed from main line into transformer 17 panels from main distribution panel 17 panels from main distribution panel 277V lighting 277V lighting 480V chillers 480V chillers 120V unit ventilators, fan coils 120V unit ventilators, fan coils Structural Structural Original Building is cast-in-place concrete Original Building is cast-in-place concrete Renovated parts include cast in place concrete and structural steel Renovated parts include cast in place concrete and structural steel Relative roof framing is steel truss construction Relative roof framing is steel truss construction

6. Mechanical Redesign Tri-Valley Jr./Sr. High School Mechanical Option Jason P. Kramer Hegins, PA Basis for Redesign Basis for Redesign Maintain current four pipe water circulation system Maintain current four pipe water circulation system Switch primary ventilation system from current fan coil/unit ventilators to Dedicated outdoor air system (DOAS) Switch primary ventilation system from current fan coil/unit ventilators to Dedicated outdoor air system (DOAS) Use current fan coil/unit ventilator as secondary cooling/heating system Use current fan coil/unit ventilator as secondary cooling/heating system

7. Mechanical Redesign Tri-Valley Jr./Sr. High School Mechanical Option Jason P. Kramer Hegins, PA What is a Dedicated Outdoor Air System or DOAS? What is a Dedicated Outdoor Air System or DOAS? Minimizes amount of ventilation air circulated through building Minimizes amount of ventilation air circulated through building What are the advantages of DOAS? What are the advantages of DOAS? Decreases duct size Decreases duct size Decrease fan size Decrease fan size Total energy recovery wheel decreases chiller size Total energy recovery wheel decreases chiller size

8. Mechanical Redesign Tri-Valley Jr./Sr. High School Mechanical Option Jason P. Kramer Hegins, PA EXCLU-SIEVE® Total Energy Wheel EXCLU-SIEVE® Total Energy Wheel Up to 90% effective Up to 90% effective Patented 3A Desiccant coating Patented 3A Desiccant coating SEMCO Packaged Ventilation Units SEMCO Packaged Ventilation Units Contain cooling coil, heating coil, total energy recovery wheel, supply and return fans Contain cooling coil, heating coil, total energy recovery wheel, supply and return fans EPCH Series EPCH Series Specified for 100% outdoor air Specified for 100% outdoor air Primary source for cooling control Primary source for cooling control Decouples sensible and latent outdoor air loads Decouples sensible and latent outdoor air loads

9. Mechanical Redesign Tri-Valley Jr./Sr. High School Mechanical Option Jason P. Kramer Hegins, PA

10. Structural Implications Tri-Valley Jr./Sr. High School Mechanical Option Jason P. Kramer Hegins, PA Existing Roof System Existing Roof System Open Web Steel Joists Open Web Steel Joists Built Up Roof Built Up Roof Proposed Roof System Proposed Roof System W Members W Members Built Up Roof with Concrete on Steel Deck Built Up Roof with Concrete on Steel Deck

11. Electrical Implications Tri-Valley Jr./Sr. High School Mechanical Option Jason P. Kramer Hegins, PA Addition of Panels and resizing of main electrical feeds to satisfy new AHUs Addition of Panels and resizing of main electrical feeds to satisfy new AHUs No implications large enough to warrant any major changes No implications large enough to warrant any major changes

12. Cost Analysis Tri-Valley Jr./Sr. High School Mechanical Option Jason P. Kramer Hegins, PA Mechanical Mechanical Large increase in first cost Large increase in first cost Major energy savings over system life Major energy savings over system life Initial Costs Initial Costs Existing – $429,202.07 Existing – $429,202.07 DOAS – $716,303.17 DOAS – $716,303.17 Energy Savings Energy Savings $31,293.00/year $31,293.00/year

13. Cost Analysis Tri-Valley Jr./Sr. High School Mechanical Option Jason P. Kramer Hegins, PA Electrical Electrical No major first cost increase No major first cost increase Small costs for wire and circuit breaker changes Small costs for wire and circuit breaker changes Structural Structural Large increase in first cost due to use of new supporting members and new roof Large increase in first cost due to use of new supporting members and new roof

14. Conclusions Tri-Valley Jr./Sr. High School Mechanical Option Jason P. Kramer Hegins, PA Decreased Chiller size by 33% Decreased Chiller size by 33% Saved 23% on annual energy costs Saved 23% on annual energy costs Increased First cost by 40% Increased First cost by 40% Attained 11 year payback period Attained 11 year payback period Although the existing system is a relatively low first cost, DOAS would be worth the payback in long run Although the existing system is a relatively low first cost, DOAS would be worth the payback in long run

15. Special Thanks to… Tri-Valley Jr./Sr. High School Mechanical Option Jason P. Kramer Hegins, PA My Parents My Parents Dr. Mumma Dr. Mumma All Other AE Faculty All Other AE Faculty Fellow Students Fellow Students EI Associates and Mark Barnhardt EI Associates and Mark Barnhardt Tri-Valley School District Tri-Valley School District John Fischer and SEMCO, Inc. John Fischer and SEMCO, Inc.

16. Questions? Tri-Valley Jr./Sr. High School Mechanical Option Jason P. Kramer Hegins, PA