building systems analysis P2

Question 1

commissioning 1

mechanical door: with Santa’s wish list

Answer 1

Review system criteria, including design temperatures

Question 2

commissioning 2

fire door: x box achievement.

Answer 2

Review and assure that design (load calculations, equipment selections) is able to achieve criteria.

Question 3

commissioning 3

fire hydrant: with fire hydrant checklist right behind it.

Answer 3

Review plans and specifications for consistency with design

Question 4

commissioning 4

fire hose: unravels to be a review list for speck after installation

Answer 4

Observe construction to assure that equipment and systems are installed per plans and specifications.

Question 5

commissioning 5

empty bulletin board: electrical test boards stability before us

Answer 5

Verify that contractor has performed pre-functional checkout of systems and equipment (e.g., proper wiring connections, clean filters).

Question 6

commissioning 6

elevators: kid testing the rides speed

Answer 6

Measure system component performance, review test results.

Question 7

commissioning 7

maintenance: with a stereing wheel

Answer 7

Verify control sequences (e.g., thermostat call for cooling starts compressor).

Question 8

commissioning 8

stairs: with file cabinets upon filing cabinets.

Answer 8

Document that these procedures have been performed along with their outcome.

Question 9

commissioning 9

fire pipe: with firefighter training putting on a hose

Answer 9

Make sure that appropriate owner’s staff are trained in operation of the systems.

Question 10

commissioning 10

room 59: with all to unread terms and policies go

Answer 10

Verify that operating manuals are turned over to the owner

Question 11

commissioning 11

filled bulletin board: with a huge fall calendar.

Answer 11

Follow up during the first year of operation to check seasonal performance and address any owner concerns.

Question 12

why do commissions

tables:
kid shacking first table

2nd table is 2nd base

3rd table has a mobile phone

Answer 12

verify systems operate
reduce need for warranty

baseline for performance tracking the condition of systems and equipment

verify systems are complete to minimize call back

Question 13

comfort of occupants why is temp not the only factor

Answer 13

humidity, air flow too low, warmth being radiated on occupants

Question 14

5 things comfort for building occupants

Answer 14

temp
air flow
humidity 
radiation
indoor air quality such as dust, pollen, ordors...

Question 15

lower comfort limit in cold weather

Answer 15

68 with 30% humidity

Question 16

upper limit in hot weather

Answer 16

79 degrees about 55% RH reality humidity

Question 17

hvac designed to maintain

Answer 17

winter 68-72

summer 72-78

Question 18

humidity ration and problem

Answer 18

60% is too high: uncomfortable and results in bad indoor air quality due to mold growth:

25-30% too low: drys breathing passages

Question 19

air flow recommendations

Answer 19

> 10’ per min or else stuffy

< 50’ per min or else drafty

Question 20

Psychrometry

Answer 20

is the science dealing with the physical laws of air – water mixtures.

Question 21

Dry-bulb temperatures

Answer 21

are read from an ordinary thermometer that has a dry bulb

Question 22

Wet-bulb temperatures

Answer 22

are read from a thermometer whose bulb is covered by a wet cloth.

Question 23

when does dry and wet bulb differ the most

Answer 23

when the air is dyrer

Question 24

what cause difference in wet bolb and dry bolb temp

Answer 24

cooling effect by evaporation of moister from wick. this

Question 25

what is the dew point

Answer 25

temperature at which moisture leaves the air and condenses on objects, just as dew forms on grass and plant leaves.

Question 26

air is saturated when

Answer 26

dry-bulb, wet-bulb, and dew-point temperatures are the same can’t hold any more water

Question 27

RH relative humility

Answer 27

amout moister air is holding / can hold

i.e 50% RH means air can hold twice as much water

Question 28

Humidity ration

absolute

Answer 28

actual weight of water in an air – water vapor mixture.

water from one pound of air squeezed dry / 1 lb of air

Question 29

how can humidity ration be explained

Answer 29

moister per pound of dry air

grains of moisture per pound

Question 30

When any _____ of these five properties of air are known, the other three can be quickly determined from the psychrometric chart.

Answer 30

2

Question 31

what are the face characteristics of the psychometric chart?

Answer 31

dry bulb
wet bulb
dew point
relative humidity
humidity ration

Question 32

psychometric chart 5 lines

Answer 32

vertical: dry bulb

humidity ratio: horizontal
dew point: horizontal

relative humidity curved

wet bulb: curved

Question 33

specific volume

Answer 33

volume of one pound of dry air at a specific temp and pressure.

as air is heat it takes up more space so specific volume increases.