AIR TEMPERATURE IN SUBWAY STATIONS Benjamin Bernays Christopher Lomenzo Daniel Sade

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

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

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

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.

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

Input Variables

Model Output: Weekday

Modeling Solutions Constant Variable(s)Changing Variable(s)Modeling Air Flow1 (m/s) HVAC Train kJ/s Platform Doors Braking Efficiency 50% 215 kJ/s 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

Proposed Solution: More efficient regenerative braking 30% Temp Range: °C 20% Temp Range: °C 10% Temp Range: °C Control Temp Range: °C

Proposed Solution: Separating Platform from Tracks 75% Temp Range: °C 50% Temp Range: °C 25% Temp Range: °C Control Temp Range: °C

Proposed Solution: Increasing station ventilation Control Temp Range: °C 100% Temp Range: °C 150% Temp Range: °C 500% Temp Range: °C

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

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

Questions? Comments? Feedback?