1. AIR TEMPERATURE IN SUBWAY STATIONS Benjamin Bernays Christopher Lomenzo Daniel Sade

2. Presentation Outline Overview of Project Developing Model Model Results Final Solutions Why We Chose This Topic

3. Project Overview Client: o Mass Transit Authority of New York Problem: o Overheating in certain stations Plan of Action: o Model existing system o Model system with potential solutions o Compare cost, efficiency, and time table of solutions o Recommended solutions

4. Model Overview Written in MATLAB Based on data available from MTA and train manufacturers Temperature as a function of time Sources of heat: o Train brakes o Train AC units Heat sinks o Ventilation from tunnel

5. Challenges Hard to get Train Specifications Unknown Station Variables Technical Specifications are Confidential Had to research and make educated assumptions/ estimates. Material insulating underground station is unknown. Specifications for station volume were not available.

6. Why choose IRT Wall Street Station? Location Layout Schedule Available data History

8. Input Variables

9. Model Output: Weekday

10. Modeling Solutions Constant Variable(s)Changing Variable(s)Modeling Air Flow1 (m/s) HVAC Train 107.5 kJ/s Platform Doors Braking Efficiency 50% 215 kJ/s 322.5 kJ/s 430 kJ/s HVAC Train430 kJ/s Braking Efficiency 20% Regenerative Braking 30% Air Flow 1 (m/s) 40% 50% Heat Transfer to air Efficiency 50% Air Flow 1.5 m/s Increased Ventilation 2 m/s 2.5 m/s HVAC Train430 kJ/s 5 m/s

11. Proposed Solution: More efficient regenerative braking 30% Temp Range: 16- 31 °C 20% Temp Range: 16- 33 °C 10% Temp Range: 16- 35 °C Control Temp Range: 16- 37 °C

12. Proposed Solution: Separating Platform from Tracks 75% Temp Range: 16- 27 °C 50% Temp Range: 16- 30 °C 25% Temp Range: 16- 34 °C Control Temp Range: 16- 36 °C

13. Proposed Solution: Increasing station ventilation Control Temp Range: 16- 31 °C 100% Temp Range: 16- 27 °C 150% Temp Range: 16- 24 °C 500% Temp Range: 16- 21.5 °C

14. Summary of Results Solution Implementation Requirements Infrastructure requirements Cost VentilationAdd in fans and ventsUnavaible Platform Doors Add doors to hottest stations $360,000 per station Replace BrakesRetrofit every trainUnavailable

15. Why this project? Benjamin Looking at a career at some type of consulting firm Chris  Interested in automotive/ vehicle engineering Daniel Looking at a career in transportation

16. Questions? Comments? Feedback?