Building Systems (MEP) Flashcards

What does 'HVAC' stand for in building systems?

Answer: Heating, Ventilation, and Air Conditioning

HVAC refers to the mechanical systems that regulate interior temperature, humidity, and air quality through heating, cooling, and ventilation.

What is the primary function of a building's 'plenum' in HVAC distribution?

Answer: To serve as a pressurized air supply or return path, typically the space above a suspended ceiling

A plenum is a portion of the building (often the ceiling cavity) used as part of the air distribution system, serving as a pressurized supply or return air pathway.

What is the purpose of a 'P-trap' in a plumbing drain system?

Answer: To maintain a water seal that blocks sewer gases from entering the building

The water retained in a P-trap's curved section creates a seal that prevents sewer gases from migrating back through the drain into the occupied space.

In electrical systems, what does 'three-phase power' provide compared to single-phase power?

Answer: More efficient power delivery for large motors and commercial/industrial loads

Three-phase power delivers power more smoothly and efficiently than single-phase, making it the standard for large HVAC equipment, elevators, and commercial electrical systems.

What is the function of an 'air handling unit' (AHU) in a central HVAC system?

Answer: To condition and circulate air by heating or cooling it and distributing it through ductwork

An AHU contains fans, heating and cooling coils, filters, and humidification equipment that condition and move air through the distribution system.

What plumbing fixture unit (FU) value is primarily used for?

Answer: Calculating the hydraulic load of fixtures to size drain, waste, and vent pipes

Fixture units are a weighting system used to compare the drainage demands of various fixtures and aggregate them to properly size drain and waste piping.