06-06
1. To ensure an easy start in mild weather, an air cooled direct
expansion (or chilled water system) is preferred.
2. While sizing the system capacity, an estimate of 100 telephone
lines = 1318 W (4,500 BTUH) shall be used.
3. To maintain the design space humidity, if the building steam is
not available, use of a portable humidifier should be considered.
B. ELEVATOR EQUIPMENT ROOM:
1. Mechanical Cooling: The designer shall coordinate the need to
maintain lower space temperature in the equipment room for proper
functioning of the associated electronic equipment; and, provide a
dedicated, standalone cooling unit, if required. The unit shall be
DX, air cooled to ensure an easy start in mild weather.
2. Ventilation: If mechanical cooling is not required, a
thermostatically controlled, dedicated ventilation system shall be
provided to remove heat gain generated due to the elevator
equipment. The system shall comprise of an exhaust fan, motorized
intake louver (if the machine room has an external wall or an
exposed roof), or a supply air make-up fan.
Air distribution
ductwork on the exhaust and intake side shall be provided as
required.
3. Heating:
To maintain the minimum design winter temperature, a
thermostatically controlled electric unit heater shall be
provided.
C. MECHANICAL EQUIPMENT ROOM:
1. Ventilation:
A thermostatically controlled ventilation system,
with features similar to the elevator equipment room ventilation
shall be provided to prevent excessive space temperature.
2. Heating:
To maintain the minimum design winter temperature, a
thermostatically controlled unit heater (hot water or steam
preferred) shall be provided.
Note that it may not be necessary
to provide any heat in the equipment rooms where steam system
components, such as, pressure reducing valve station and/or steam
to hot water convertors are located.
D. TRANSFORMER ROOM: Similar to Item D above.
The space heat gain due
to the transformer losses shall be calculated based on the KVA
ratings and type of transformers.
Use the following estimate as a
guide:
1. Dry Type Transformers: 35 W (120 BTUH) per KVA for 30 KVA to 112
KVA sizes.
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