and the recirculating air is brought in through a simple return grille. Outside fresh air is brought into cabinets (A) and (B) .from a com- mon air duct which starts from an artistic lattice in a corner of the building about two storeys above leading into the basement.
The main air supply duct for system (B) is made of aluminium and insulated with one inch cork- board and has inside dimensions of 30" × 68′′. Air velocity in this shaft is close to 1,800 f.p.m.
Thermal insulation is applied on the outside of the main shaft even though it runs entirely in conditioned areas primarily because of anticipa- tion of isolating some of the inter- mediate floors from air conditioning and the possibility of condensation. occuring without insulation.
Air quantities and conditions vary on all floors. An elaborate system of zoning has been worked out for each floor depending upon sun load and conditions arising from con- ference areas and dining rooms, etc. More air, of course, is provided for dining rooms and conference areas. This air is exhausted by positive
means through the kitchens in these areas thus preventing food odours from permeating other areas. Positive exhaust is also used for the records, transformers and switch rooms of the building.
An automobile garage for 28 cars is located in the basement and is provided with a fresh air supply duct and a separate exhaust system. At the opposite end of the garage and at several points throughout the garage, air exhaust grilles are pro- vided to remove exhaust gases from the floor level. This provision is to take care of carbon monoxide gas which is heavier than air. The garage air is exhausted from a point on the roof of the building so that gas diffusion is quite complete before any gas can be returned by shifting winds to any of the office areas through windows or fresh air sup- plies.
The
In addition to this, three other independent exhaust systems are employed for exhausting the lavatory areas throughout the building exhaust make-up here would be fur- nished by the conditioned air equal to the amount of fresh air brought in by the air conditioning cabinets.
The vaults are air conditioned by a built-in supply duct which is con- nected to the air supply by a special detachable connection operated by gears when the vault door is opened. The vault exhaust is through the
open door. This arrangement
affords a positive seal for all vaults when doors are closed.
Sea water with cupro-nickel con- densers is used throughout for con- densing. 8" cast iron pipe 2,600 feet long carries and returns sea water to and from the condensers for cooling. Radial condensing units equipped with sea water con- densers are supplied with motors specially wound for 346 volts, 3 phase, 50 cycle current.
The control system is electrical in its entirety and consists of provisions for full outside fresh air whenever possible, complete winter and summer humidity control and automatic change over from cooling to heating or vice versa as required at any time of day or year,
The summer inside design conditions are 80 deg. F. dry bulb, 50% relative humidity when outside summer conditions are 92 deg. F. dry bulb and 80 deg. F. wet bulb.
SNOWCEM
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SAN MIGUEL BREWERY
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SNOWCEM
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Green Island Cement Co., Ltd.
TELEPHONE HOUSE
TEL 21463
11
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