BSE 216 site visit report

LOCATION: 9/F R CORE, HONG KONG POLYTECHNIC UNIVERSITY

SITES 2: GENERATOR ROOM

Design considerations:

1. The emergency electricity generator located in a room on 9/F, which is at

the upper part of the building.

a. If a fire broke out in generator room,

the fire will not go to lower floor

easily. Due to the spreading

characteristic of fire is horizontality

and upward.

b. When the generator is operating, it

will generate lot of exhausted gas.

According to the environment policy, the ventilation outlet should have at least 5m

far away from any window, so the generator was put on such a high floor which can

avoid a long air duct installation.

2. Ventilation system of the generator room

a. There is a big ventilation duct installed at

inside the room, it can provide adequate

fresh cool air for the generator to release

heat.

3. The emergency generator is installed in the

central of the room

a. It can provide adequate space for

whatever maintenance, heat

releaseor accomdate of the

emergency generator.

4. Doorsill at the entry

a. A raised doorsill can prevent water flushing into the generator room, in

order to prevent any unnecessary damage.(我冇個門檻既圖)

5. Control panel concentrate at one wall

a. Control panels consentrated at one

wall, this design is to make user

easier to contorl the machnic,

because user did not have to move

around the room to overse different

feature of the control display panel.

6. Emergency shutdown device of the generator

a. When fire happen in the generator room, it is very danger to go inside and switch off

the generator. However, There are two method to do it instead of go into the room.

i. Method A, the generator can

be stopped by broken the red

box’s grass outside the

generator room and pull the

handle to cut off the oil

supply for the generator.

ii. Method B, there is a thin metal wire above the generator.When it bruned

due to the very high temperature ,the suspend mass will drop down and cut

the oil supply of the generator immedately.

wire

Suspended mass

Connected here to cut of the oil supply

7. Raised concrete block

a. It can provide extra vibration

resistance.

b. It can provide a thermal resistance between the next floor and the

generator.

c. If there is any water flushed into the room, this will provide extra water resistance

and prevent short circuit.

8. Fire safety devices

a. There is a CO2 fire extinguisher

inside the room. If someone is in

room when the generator is on fire,

he can use it to fight the fire.

b. There is no other fire extinguish

equipment inside the generator

room. There are two reasons.

i. The emergency generator is

seldom used, it only will

operate when the electricity have been cut for a designated time

period.

ii. The generator is used to generate electricity power, if we using

water sprinkler inside the room, it will be very danger and also

damage the generator seriously.

c. There is smoke detector inside.

And it is directly connected to the

main building control system, so

that the security guard in the main

control room can know about the

situation immediately

9. Extra ventilation fan

An exhausted fan is also installed to keep the air in the room is flesh enough. It will

operation when the room temperture

reach a desginated point.

This is the senor and the switch box of the fan

10. Battery and Charger

The Battery is located in a woodern

box to prevent eletric shock.

11. Warning notices

There are lot of notice to warn for the

dangerous.