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Building Systems > PDX_03_Environmental Issues Vocabulary > Flashcards

PDX_03_Environmental Issues Vocabulary Flashcards

0
Q

Overall rate of heat flow through any combination of materials, used for determining the size of heating system

A

Coefficient of heat transmission

Or U-value

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1
Q

A measure of energy, typically noted as the amount of energy needed to raise 1 pound of water by 1°F

A

British Thermal Unit

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2
Q

BTU/hour that passes through 1 ft.² of material of a given thickness when the change in temperature is 1°F

A

Conductance (C)

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3
Q

Ability of a material to transmit or conduct heat or electricity based on the physical properties of the material, expressed in BTU

A

Thermal conductivity (k)

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4
Q

BTU/hour that passes through a 1 ft.² of material 1 inch thick when the change in temperature is 1°F

A

Conductivity (k/in)

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5
Q

The difference between conductivity and conductance

A

Conductivity specifies the thickness of given material to be 1”

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6
Q

The measure of an objects ability to absorb and then radiate heat

A

Emissivity

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7
Q

Energy radiated by the surface of a body person per unit area

A

Emittance

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8
Q

Number of hours needed for one BTU to pass-through 1 ft.² of material or assembly of a given thickness when the change in temperature is 1°F

A

Resistance (R)

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9
Q

Heat required to convert a solid to a liquid or vapor, or a liquid into a vapor, without change of temperature, given in BTU

A

Latent heat

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10
Q

Amount of energy released or absorbed by chemical substance during a change of temperature, changes the temperature but not the state, given in BTU

A

Sensible heat

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11
Q

The amount of energy required to raise the temperature of a material by 1°F, the capacity to store heat, given in BTU

A

Specific heat

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12
Q

Heat given off by a vapor condensing to liquid, or the heat absorbed by a liquid evaporating to a gas without a change in temperature

A

Heat of vaporization

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13
Q

Ratio of moisture content of the air to the max possible moisture content of air at the same temperature without condensing

A

Relative humidity

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14
Q

Total heat loss in a substance (latent and sensible heat), given in BTU

A

Enthalpy (H)

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15
Q

Transfer of heat between services that are not in direct contact

A

Radiation

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16
Q

Transfer of heat between two objects that are in direct contact

A

Conduction

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17
Q

Transfer of heat that requires a fluid medium like air to transfer

A

Convection

18
Q

Liquid is absorbed into the air as latent heat

A

Evaporation

19
Q

Amount of insulation which will maintain normal skin temperature of the human body, equivalent of a typical American man’s suit in 1941

A

Clo

20
Q

The average yearly difference between the indoor temperature and outdoor temperature. Typically a reference temperature of 65°F is used.

A

Degree Day (DD)

21
Q

Used to design and size heating system that determines the day cooler than 98% of all days in a year experienced in a climate

A

Design Day

22
Q

Typically referred to as air temperature, it’s what people are referring to when they talk about temperature. It’s an indicator of heat content and measured by a common thermometer, given in degrees Fahrenheit.

A

Dry bulb temperature

23
Q

The lowest temperature that can be reached under current ambient conditions by the evaporation of water only, given in degrees Fahrenheit.

A

Wet bulb temperature

24
Q

The temperature at which water vapor starts to condense out of the air. About this temperature the moisture will stay in the air, given in degrees Fahrenheit

A

Dew point (T)

25
Q

Range of temperatures and humidity’s in which most feel comfortable when dressed in typical indoor clothing and engaged in typical indoor activities

A

Comfort zone

26
Q

A rough estimate of how much whole room/building air is replaced by outdoor air per hour

A

Air Changes Per Hour (ACH)

27
Q

Average temperature swing from day to night

A

Main daily average

28
Q

average radiant temperature of your surroundings, independent of air temperature

A

Mean radiant temperature (MRT)

29
Q

Instrument for measuring atmospheric pressure

A

Barometer

30
Q

Used to measure radiant temperature. To dry bald thermometer encased in a matte black copper sphere

A

Globe thermometer

31
Q

Instrument used to measure the relative humidity of the air

A

Hygrometer

32
Q

Tisha’s temperature that produces the same physiological effect as the combined effects of temperature, humidity, and air movement in my

Not an actual temperature

A

Effective temperature

33
Q

Fictitious temperature assigned to physiological combination of actual temperature and wind velocity which has the same

A

Wind chill index

Chill factor

34
Q

Study of physical and thermodynamic properties of gas-vapor mixtures

A

Psychometrics

35
Q

A graph depicting physical and thermal properties of moist air, often at an elevation relative to sea level.

A

Psychrometric Chart

36
Q

The measure of how a material does not allow heat flow

A

Thermal Resistance (R-Value)

37
Q

The measure of how heat flows through a building component or assembly when the difference between air temperature on the two sides is one unit of temperature

A

Thermal Transmittance (U-Value)

38
Q

Capacity of a material to store heat (BTU/lb)

A

Specific Heat

39
Q

Ability of a given volume of material to store heat (BTU/ft³)

A

Thermal Capacity

40
Q

Radiant heat gain from the sun

A

Insolation

41
Q

23.5° tilt of the earth’s axis relative to a line perpendicular to the plane of the earth’s orbit

A

Declination

42
Q

CFM

A

Cubic feet per minute

43
Q

ACH

A

Air changes per hour

A rough estimate of how much whole room/building air is replaced by outdoor air per hour

Building Systems (37 decks)

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