Reference no: EM133162803
AE 340 Architectural Illumination and Electrical Systems - Drexel University
Write legibly, that means if I can't read it, I can't give you points.
Make sure you have units in all your calculations, and make your assumptions clear for any information that is not given in the exam text.
THE SCENARIO
The problems in this exam will be in the context of a hotel lobby (see below for the floor plan).
PROBLEM 1.
The hotel's lobby above has dimension of 120ft x 60ft (the entire figure above), you should approximate the size of each room/zone based on this dimension.
a) Here are some illumination requirements: reception/seating 250 lux, boutique 750 lux, hallway/staircase 50 lux, restroom/storage/elevator 200 lux. Design a lighting scheme for the following 3 areas using the Lumen method: 1) reception area, 2) boutique, 3) main hallway in the middle. Use UF/CU=0.7 (not including fixture efficiency) and MF/LLF41.85. Select the types of light fixture and the number of the fixtures for each area. Use the supplied product sheet for your selection. Make sure you are also meeting the LPD of 0.9 WM' requirement (for the whole building, or combination of the 3 spaces in this context, not an individual space).
b) Estimate the illuminance for a single point in the middle of the boutique store using the point-to-point method to check whether the illumination requirement was fulfilled (ceiling height is 12', use 3' off the floor as your surface). Using only the light fixtures from your design in part a) in the boutique which you can then estimate the lighting power toward the surface (hint: if you placed the lights symmetrically you don't need to calculate for every light fixture).
PROBLEM 2.
The hotel has 3 elevators for the guests, and the type of elevators have been selected and will required a 10 hp 3-phase motor for each of the elevator installations.
a) The catalogue shows the motor requires 208V 3-phase power for the motor but also a 120V single phase for the computer controller. Draw and label the type of 3-phase transformer wiring diagram for the connection that can provide this voltage requirement.
b) For one elevator in a), assuming power factor = 0.8 and efficiency is at 70%, find the gauge of wire needed for the 3-phase portion of the motor.
PROBLEM 3.
a)
Determine all electric loads in the lobby (lighting + outlets + 2 of 2kW 240V single-phase fan coil units. Exclude the elevators because they are three phase), calculate the loads (VA) and group them into circuits. Use lighting loads from Problem!, you can assume lighting load of the seating area has the same load as the reception, and storage/restroom has the same lighting load as hallway. Do not include the area around the elevators (hallway + reception + boutique + seating + restrooms + storage).
b) Size the breakers based on part a). Make sure you have the voltage, current, loads (VA), name of the circuit, breaker size and how many pole it takes in your sizing. Show your calculations and use the provided panel schedule.