Temperature, Humidity And Ventilation (110201e)

Question 1

What is heat?

Answer 1

Heat is a form of energy
( the ability to work)

Question 2

What is a BTU?

Answer 2

British thermal unit the amount of heat required to raise the temperature of 55 cubic feet of air 1 degree Fahrenheit

Question 3

What is cold?

Answer 3

Cold is the relative absence of heat

Question 4

What is temperature?

Answer 4

Is the measure of the intensity of heat of a substance

Question 5

What are the two laws of thermodynamics?

Answer 5

The first is that energy can neither be created nor destroyed
The second is that heat travels from a warm object to a colder one

Question 6

What are four methods of heat transfer?

Answer 6

Conduction
Radiation
Convection
Latent heat of evaporation

Question 7

What is conduction?

Answer 7

The transfer of a heat thorough a substance

Question 8

What is convection?

Answer 8

The transfer of heat by natural motion

Question 9

What is radiation?

Answer 9

The transfer of heat by energy waves similar to light waves

Question 10

What is sensible heat?

Answer 10

Sensible heat is the heat required to change the temperature of a substance but not the state

Question 11

What is latent heat?

Answer 11

Latent heat is the amount of heat required to change the state of a substance without changing its temperature

Question 12

What is latent heat of evaporation?

Answer 12

Latent heat evaporation is the amount of heat required to change a liquid to a gas without changing its temperature

Question 13

What is the specific heat of a given substance?

Answer 13

The numerous of btus required to raise the temperature of 1 pound of that substance 1 degree Fahrenheit

Question 14

Humidity is defined as what?

Answer 14

The amount of water in the air

Question 15

Dew point temperature is what?

Answer 15

The temperature that moisture will start to condense from the air

Question 16

Relative humidity is what?

Answer 16

A measure of the amount of water air can hold at a certain temperature

Question 17

What is a psychometric chart?

Answer 17

It is used by engineers in ac industry to determine values to properties of air

Question 18

What effects does humidity have on structures?

Answer 18

Too much humidity will condense on windows and could cause ice build up

Question 19

Different types of humidifiers are?

Answer 19

Pan style
Drum style
Disc wheel
Flow through

Question 20

The main purpose of fresh air is?

Answer 20

Fresh air from outside the house is brought in to replace stagnant air caused by pollutants and oxygen depletion

Question 21

A typical two fan HRV what do the fans do?

Answer 21

One fan removes exhaust air
The other fan brings in fresh air

Question 22

The principal Ventilation fan is sized according to what?

Answer 22

Number of bedrooms

Question 23

Some HRVs are capable of recovering what percentage of the heat of outgoing air?

Answer 23

85 percent

Question 24

If a hot object is placed in a cooler liquid what will happen?

Answer 24

The hot object and cooler liquid will eventually become the same temperature