BOMI: AIR HANDLING, WATER TREATMENT

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BOMI: AIR HANDLING, WATER TREATMENT &

PLUMBING SYSTEMS STUDY G UIDE EXAM AND

ACTUAL EXAM LATEST TEST BANK|

COMPLETE 450 QUESTIONS AND CORRECT

VERIFIED ANSWERS / ALREADY GRADED A+

What are the four main categories of internal heat loads? - ANSWER - People Heat Load Lighting Heat Load Equipment Heat Load System Heat Load

How have office building HVAC systems been designed to compensate for heat gain from office equipment? - ANSWER - Air conditioning systems have been designed to offset one to three watts per square foot.

What is pull-down load? - ANSWER - Heat left over from the day before must be removed the following morning when the air conditioning system is restarted.

How can the problem of air and water vapor infiltration into a building be solved? - ANSWER - To reduce infiltration problems, ventilation air should be introduced through the air conditioning system in constant quantities to maintain a slight positive pressure within the building.The pressure cases an outward escape of air through cracks, windows, and doors, limiting infiltration. 1 / 4

pg. 2 Which type of building is the perimeter loop system ideal for? - ANSWER - Single-story buildings with concrete slab floors.

All of the following factors that influence the amount of ventilating air

required: - ANSWER - The number of people occupying the space

The activities performed in the space The volume of the space

What is a key aspect of a well-designed air-distribution service? - ANSWER - Maintaining air outlet noise below an objectionable level.

Anti-smudge rings will help reduce deposit on outlets, but the best

solution is to: - ANSWER - Select outlets with lower velocities

Complying with codes regarding fire dampers help to: - ANSWER -

Prevent facilities from smoke inhalation

Define APH - Air Horsepower - ANSWER - The amount of work a fan performs to move a specific volume of air at a specific speed.

What is BHP Breaking horsepower? - ANSWER - The amount of physical work that is put into the fans motor to drive the fans shaft.

Define mechanical efficiency - ANSWER - The ratio of a Fan's AHP to it's BHP. this value stays the same through all of a Fan's different 2 / 4

pg. 3 operating speeds. because of friction and turbulence loss in the fan itself, BHP is always greater than AHP.

What do the basic fan laws depend on? - ANSWER - The basic fan laws depend on the fact that be Mechanical Energy of a fan remains constant throughout its use of range and operating speeds.

What can the fan laws be used to determine? - ANSWER - These found laws can be used to calculate fan speed, horsepower, and system pressure as the volume of air moved by the fan varies.What is the formula for calculating a new fan speed in revolutions per minute? - ANSWER - New RPM = Old Rpm x (new cfm/oldcfl)

What does a fan's system resistance curve represent, and what can you locate by superimposing the fan performance curve on the system resistance curve? - ANSWER - The system resistance curve represents the total resistance of the system.By superimposing the fan performance curve on the system resistance curve, you can locate the point at which this fan and this system will operate.

What are three methods of static pressure control most commonly used for a centrifugal van in a VAV system? - ANSWER - The three methods of static pressure control most commonly used for a centrifugal van in a

VAV system are:

Vortex aka. inlet vanes Fan speed control 3 / 4

pg. 4 Variable pitch blade control

What is the most common cause of reduced fan performance? - ANSWER - Poor inlet conditions are the most common cause of reduced fan performance.

What is pressure drop? - ANSWER - Load is the resistance that a system must overcome to accomplish the job it was designed to do. A load cases a drop in pressure. The pressure drop is measured as the difference in pressure between where air enters a device and where is comes out of a device.

What is friction loss? - ANSWER - Friction loss describes the relationship between the roughness of the duct interior surface and the velocity of the airflow in the duct.

When designing a duct system, what is important to remember about directional changes? - ANSWER - Directional changes increase friction and reduce efficiency.

What are the commonly used methods for air duct design? - ANSWER - Perimeter loop Extended plenum Perimeter radial

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