Load Calc, Mid/term Review

Question 1

Comfort includes what four things?

Answer 1

Controlling temp
humidity
airflow
air quality

Question 2

Which way does heat want to travel?

Answer 2

HOT to COLD

Question 3

At summer most peopl are comfortable at what temp?

Answer 3

75/50

Question 4

Air consist of what percentage?

Answer 4

78% nitrogen 21% oxygen 1% other

Question 5

Temp where moisture condense in the air?

Answer 5

Dew point

Question 6

Weight at water vapor to lb of air to saturation?

Answer 6

Relative humidity

Question 7

Summer raised temp?

Answer 7

Lower humidity

Question 8

Study of air and its properties?

Answer 8

Psychometric

Question 9

4 ways the body gives off/absorbs heat?

Answer 9

Conduction
Convection
Radiation
Persperiation

Question 10

(2 part question) perfectly dry air has a weight of what?

Answer 10

20x20x8
.075 dry air weight
3200*.075

240

Question 11

Difference between dry and wet bulb?
Can wet bulb be higher than dry bulb?

Answer 11

Dry bulb is sensible heat.
Wet bulb is latent heat .

No it can’t be higher.

Wet bulb us 80% dry bulb is 80% = 100% relative humidity

Question 12

What wet bulb content is in the air?

Answer 12

Wet bulb containts of moisture in the air

Question 13

What tool can you use to measure wet/dry bulb?

Answer 13

Pyshcronmeter

Question 14

Heated air is not capable of holding more moisture than cold air. (T/F)

Answer 14

False

Question 15

Heated air is more dense than cold air (T/F)

Answer 15

False

Question 16

Infiltration vs, ventilation, which one was planned and mechanical?

Answer 16

Ventilation

Question 17

Infiltration vs, ventilation, which one was planned and mechanical?

Answer 17

Ventilation

Question 18

Air exchange 40% <- energy code ventilate at what % <- (.4)

Answer 18

20008 =16000.4 = 6400cu.Ft/hr
Divide by 60
6400\60 = 107cfm

Question 19

Infiltration+Ventilation will not add any ventilation? (T/F)

Answer 19

False

Question 20

Summer and indoor conditions are the same? (T/F)

Answer 20

False

Question 21

Winter temp is what?
Summer temp is what?

Answer 21

Summer 75/50
Winter 70/35

Question 22

Enthalpy increases moisture content gets where?

Answer 22

Moisture content increases

Question 23

Winter time what do you want
(Vice versa) for summer?

Answer 23

Lowest possible maintaining temp

Question 24

Does air have weight ?

Answer 24

Yes, swing a piece of cardboard

Question 25

Relative humidity at 100% is what?

Answer 25

Air is saturated

Question 26

Persperiation cools the body how?

Answer 26

Evaporation

Question 27

Dry bulb temp increase, no change in wet bulb, what happens to due point?

Answer 27

Due point goes down

Question 28

Summertime, bringing in ventilation air?

Answer 28

Both add a load Summertime it adds sensible heat and latent heat.

Question 29

Below due point to humidify Air (T/F)

Answer 29

False