Temperature, Humidilty And Ventilation

Question 1

The required fresh air in new residential construction

Answer 1

Master room and basement 10L/s or 20cfm

Question 2

What is heat

Answer 2

Form a energy that cause random vibration of molecules

Question 3

Thermodynamics

Answer 3

Science dealing with mechanical action
1. Energy can’t be created or destroyed but can be converted
2. Heat always transfer from warm to cold

Question 4

Conduction

Answer 4

Transfer of heat through a substance
Happens in solid, liquid and gas

Question 5

Convection

Answer 5

Transfer of heat by natural motion of a fluid medium either liquid or gas
Heat increase air volume and decrease density so lighter

Question 6

Radiation

Answer 6

Transfer of heat by energy wave
The transfer requires no medium

Question 7

Sensible heat

Answer 7

Is the heat requires a change in temperature, but not change in state.
Can be measured by thermometer or by sense of touch

Question 8

Latent heat

Answer 8

Is the amount of heat required to change the state of a substance without changing temperature.

Question 9

Latent heat of evaporation

Answer 9

The amount of heat required to change a liquid to gas without changing its temperature

Question 10

Specific heat

Answer 10

Is the number of Btus required to raise the temperature of 1 pound of that substance 1F

Question 11

Btu

Answer 11

The amount of heat required to raise 55 cubic feet air 1F or 1 pound 1F

Question 12

Humidity

Answer 12

The quantity of water in a particular volume of air

Question 13

Humid air is less dense than dry air

Question 14

Two instruments to measure relative humidity

Answer 14

Psychrometer and hygrometer

Question 15

Dry bulb temperature

Answer 15

Temperature of air as recorded by a standard thermometer

Question 16

Wet bulb temperature

Answer 16

Temperature indicated by a thermometer whose bulb is covered by a wet cloth wick

Question 17

Dew point temperature

Answer 17

Is the temperature that moisture will start to condense from the air

Question 18

Relative humidity

Answer 18

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

Question 19

Saturated air

Answer 19

When the air contains the max amount of vapour possible for a particular temperature
Warm air can hold more vapor than cold air

Question 20

Pan style

Question 21

Drum style

Answer 21

When humidistat calls

Question 22

Disc wheel style

Question 23

Flow through style

Answer 23

Requires a drain

Question 24

Electrode type(electric steam humidifier)

Answer 24

Water quality affects the operation and maintenance of

Question 25

Ionic bed(electric steam humidifier)

Answer 25

Current doesn’t pass water. Water quality doesn’t affect operation and maintenance

Question 26

How to reduce humidity at home

Answer 26

Moisture absorbing shower curtain, ventilation in bathroom, bring cold fresh air into furnace. Use dehumidifier

Question 27

Function of humidistat

Answer 27

Controls the he humidifier turning on and off as required

Question 28

Absolute zero (-460 F, 0 Rankin). (-273C, 0 Kelvin)