Compressed Air Outlets

A ball valve, a pressure-reducing valve, a filter, and a quick-disconnect coupling should be provided at each compressed air outlet.

Refrigerated Dryer

Some compressed air applications require moisture removal in addition to that provided by an aftercooler. Such commercial applications include paint spraying, sandblasting, the use of air-operated tools and devices, pneumatic automatic temperature controls, lines run out­side in cold or subfreezing locations, and lines passing through cold storage rooms. Where moisture removal is required, provide a refrigerated type air dryer located downstream from the compressor initial exhaust duct area and prior to discharge to the environment.

AIR SUPPLY AND DISTRIBUTION SYSTEM

The design of all systems must comply with the ASHRAE handbook and to the require­ments of NFPA Standards Nos. 90A, 90B, and 91.

Basic Design Principles

All designs will be based on the following basic principles:

• Interior design conditions, including temperature, humidity, filtration, ventila­
tion, and air changes, will be suitable for the intended occupancy.

• The designer will evaluate all energy conservation items that appear to have
potential for savings, such as heat recovery for HVAC and service water heating,
economizer cycles, and plastic door strips for load docks, and will include those
items in the design that are life cycle cost-effective.

• The design will be as simple as possible.

• Adequate space will be provided for maintenance access to ancillary equipment
such as filters, coils and drain pans, and strainers.

• To the extent practical, system airflow will be minimized. Integrated air-
conditioning and lighting systems will be used whenever the general lighting
level is 100 fc or greater.

• Recovered heat will be used for reheat where possible.

Temperature Settings

HVAC sequence of control should include procedures for personnel to reset HVAC control settings in occupied zones from 76°F (24°C) up to 78°F (26°C) if future energy con­servation actions are required.

• The design relative humidity will be at least 50% or the design temperature equal
to the outside air dew point design temperature, whichever is less.

• The indoor design specific humidity will not exceed the outdoor design specific
humidity; otherwise the indoor design relative humidity will be 50%.

• The indoor design temperature provided by evaporative cooling or comfort
mechanical ventilation will be 80°F.

Дата добавления: 2015-11-16