PDX_19_Hvac Details And Constructibility

Question 0

Single blade dampers that is hinged at one end and installed to divert air from the main duct into a branch duct

Answer 0

Splitter damper

Question 1

The means for delivering heating and cooling

Answer 1

Distribution trees

Question 2

A curved fin that fits inside adduct to direct the airflow to another direction without adding noise to the system

Answer 2

Turning vane

Question 3

A small amount of supply air and a very high velocities delivered to a box and mixed with air brought in from the room inducing a greater airflow

Answer 3

Induction

Question 4

Noncombustible and heat resistant passage in the chimney used to convey products of combustion from furnace, fireplace, or boiler to the atmosphere

Answer 4

Flue

Question 5

Enclosure in which to airstreams are mixed, commonly used in a dual duct system

Answer 5

Mixing box

Question 6

Water intentionally wasted from the boiler to avoid concentration of impurities during evaporation of steam

Answer 6

Blowdown

Question 7

Watered used to supply a boiler to generate steam or hot water

Answer 7

Feedwater

Question 8

To find the cross-section area of a duct:

Answer 8

144 x ( flow rate in cubic feet per min.)

/ velocity measured in ft/min

Question 9

To measure friction loss in a circular duct:

Answer 9

0.109136 CFM ^1.9

/ equivalent duct diameter ^5.02

Question 10

To reduce size on lower building floors

Answer 10

Utilize a distribution tree that flows from a rooftop central AHU

Question 11

High velocity ducts are anything over:

Answer 11

2500 ft./m

Question 12

Low velocity ducts at speeds:

Answer 12

1000-2200 ft./m

Question 13

Most common material for vents and ducts:

Answer 13

Sheet-metal made of galvanized steel or aluminum, because most durable and least likely to have mold/bacteria growth

Question 14

A duct material option other than sheet-metal:

Answer 14

Fiberglass lined, used to insulate dryer ducts from heat loss, to avoid condensation, and or to reduce sound.

Question 15

Hey valve or plate that stops or regulates the flow of air inside a duct:

Answer 15

Damper

Question 16

Most common type of fan

Answer 16

Bladed fan

Question 17

Fan used for moving large amount of air:

Answer 17

Centrifugal fan

Question 18

These reduce velocity and sound has air enters the space from ductwork

Answer 18

Diffusers

Question 19

Chimney height must be:

Answer 19

2 feet higher than any part of the roof within 10 feet horizontal.

Question 20

In the HVAC design process, component sizing typically occurs before:

Answer 20

Resolving conflicts with other building systems.

Question 21

Locating a heat source below window evens out the temperature in the room, but:

Answer 21

Increases heat loss through the window

Question 22

Mechanical room space requirements for medium to large buildings with air or air/water systems should be:

Answer 22

3-9% of gross building area for air or air/water systems

Question 23

Mechanical room space requirements for medium to large buildings with water systems should be:

Answer 23

1 - 3% for water systems

Question 24

The space for the mechanical room needs to be

Answer 24

Twice the length of the major equipment and 12 - 18 ft tall