PDX_14_Hvac Building Design

Question 0

The amount of heat lost at design outdoor and indoor conditions which must be made up by the HVAC system to maintain occupant comfort

Answer 0

Peak heat loss

Question 1

The maximum output potential of a heating/cooling system in one hour and is used to size HVAC equipment

Answer 1

Full load hours

Question 2

Used for calculating heat game through building envelope, and takes into account air temperature differences, effective son, thermal mass storage affect the material, color finishes etc.

Answer 2

Design equivalent temperature difference

DETD

Question 3

Used for calculating he came through glazing, takes into account glazing type, interior shading, and outdoor temperature

Answer 3

Design cooling load factor

DCLF

Question 4

And equivalent temperature difference used for calculating the instantaneous external cooling load across a wall or roof

Answer 4

Cooling load temperature difference

CLTD

Question 5

The speed with which he passes through a material

Answer 5

Conductivity

Question 6

Equipment that permits the use of outdoor air instead of refrigeration units for building cool link when conditions are right

Answer 6

Economizer

Question 7

Evaluates both temperature and humidity, mixes appropriate outdoor/indoor air to achieve comfortable conditions without cooling

Answer 7

Enthalpy economizer

Question 8

Gravity heating systems used by the Romans to keep public baths and private houses

Answer 8

Hypocausts

Question 9

I’m out of cooling required to convert a time of water to ice in a 24 hour period, equivalent to 12,000 BTUH

Answer 9

Ton

Question 10

1 Watt = ___ BTU per hour

Answer 10

3.41 BTU per hour

Question 11

1 kWh = ___ BTU per hour

Answer 11

3,400 BTU per hour

Question 12

1 ton of AC = ___ BTU per hour

Answer 12

12,000 BTU per hour

Or 3.5 to kilowatt ours

Question 13

Units for ventilation:

Answer 13

CFM per person

Question 14

Units for heating:

Answer 14

BTU per hour

Question 15

Units for cooling:

Answer 15

BTU per hour

And tons

Question 16

U-value is

Answer 16

The conductance of the assembly

Question 17

The change in temperature, ΔT =

Answer 17

Difference between outside and inside air temperature

Question 18

R-value is better the larger or smaller?

Answer 18

Larger

Question 19

How to find the U-value:

Answer 19

Find the R-value of each component and add them together, then calculating 1 / total R-value

Question 20

When HVAC systems exhaust more hair than they take in,

Answer 20

It can result in negative pressurization inside the building.

Question 21

Ideally the air pressure in a building should be:

Answer 21

Equal to or slightly positive to the air pressure outside the building.

Negative pressure can cause cold draft and noxious odors coming in through cracks in openings.

Question 22

When warm air rises and goes out the top, pulling in cooler air at lower levels through cracks in openings this is an example of:

Answer 22

Stack effect

Question 23

Building success depends on:

Answer 23

How comfortable people are inside, and how affordable it is for them to be that way.

Question 24

Tool used to identify drafts and air leaks

Answer 24

Smoke pencil you lie

Pull the trigger and see how smoke moves to show air movement

Question 25

Electric air cleaner operation:

Answer 25

High-voltage of static charge are applied to dust which is then attracted to oppositely charged plates on the cleaner.

Question 26

What process has been widely used to identify “at risk areas” for radon?

Answer 26

Geological mapping

Question 27

Pathogen destruction can be achieved using these lamps

Answer 27

UV lamps

Question 28

HEPA air filters are frequently found in

Answer 28

Hospitals

Question 29

Furnished with HVAC equipment and function mainly to protect fans from large particles of lint or dust. The least effective in cleaning the air.

Answer 29

Fibrous panel filters

Question 30

Hey more fine filter that use paper in place within the frame, working by straining and impaction. 90% efficient

Answer 30

Media filters

Question 31

This filter is more costly upfront, the produces less air movement as two sets of charged plates attract dust. Or cleaned by washing off.

Answer 31

Electrostatic filter’s

Question 32

This filter is for gaseous removal and very depending on pollutant.

Answer 32

Absorption filter

Question 33

This absorption filter is more common and absorbs materials with high molecular weights and allows low weights to pass.

Answer 33

Activated Charcoal filters.

Question 34

This filters sometimes used to control bacteria growth and control humidity.

Answer 34

Air washers

Question 35

These air cleaners can pose a threat due to ozone production, but demand less maintenance.

Answer 35

Electronic air cleaners

Question 36

Exhaust fan capacity should be at least__% of the total HVA system airflow capacity in a residential building

Answer 36

50%

Question 37

Required air change rates for ventilation is based on

Answer 37

Size and occupancy of space.

Question 38

The worst local air quality problems tend to be around:

Answer 38

Hospitals, shopping areas, or public transport hubs

Where large numbers of vehicles move slowly or idle