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ARE Building Systems > GENERAL > Flashcards

GENERAL Flashcards

0
Q

Dual duct system

A

Hot air and cold air supplied by separate ducts to be mixed at ea controlled space to provide the desired supply air temp. Consumes a lot of energy.

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1
Q

Surge arrester

A

Device installed in a water line to minimize the effects of water hammer caused by quick closing valves.

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2
Q

Plenum

A

Space bt clg and structure above, used as a slow moving duct

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3
Q

Occupancy group

A

Designation for a group of occupancies with comparable fire safety considerations.

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4
Q

Inch of water

A

Unit of pressure equal to the pressure of a column of water one inch high. One inch of water = 0.03609 psi

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5
Q

Variable are volume (VAV)

A

AC system accommodating thermal load changes by varying flow of supply air instead of temperature

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6
Q

Alternation

A

Reversal of an alternating current wave, 2 of which create a complete cycle

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7
Q

Hub

A

End of a pipe enlarged to receive the end of another pipe so as to form a joint. Also called a bell.

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8
Q

Flat plate system

A

Device used to collect solar energy, usually consisting of a glazed cover, transfer medium (water or air), absorber plate and insulation

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9
Q

Thermosiphon

A

Circulating air with natural convection from heating. I.e. Ventilating a bldg by sending warmed air out the top and siphoning cooler air at the bottom

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10
Q

Branch vent

A

Connects one or more individual vents to a stack vent

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11
Q

Reversible-acting valve

A

Opens when pressure is applied and closes when pressure is released

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12
Q

Power factor

A

Ratio of real power in watts to the product of voltage and current

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13
Q

Register

A

Grille and damper to control amount of air passing thru

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14
Q

Differential thermostat

A

Responds to temperatures at 2 different locations…. It’s used to activate a solar heating system when he collector is water the the storage medium

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15
Q

Sabin

A

Unit of sound absorption equal to absorption of one square foot of open window

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16
Q

Impedance… And what do you measure it in?

A

Resistance in an AC circuit consisting of resistance, reactance or both. Measured in ohms.

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17
Q

Damper

A

Decide inserted in an air stream to modulate restrict or divert flow of air

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18
Q

Expansion valve

A

Valve which controls the flow and reduces pressure of the refrigerant, allowing it to evaporate and absorb heat

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19
Q

Standard air

A

Air at a standard temperature and pressure

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20
Q

OSHA

A

Occupational safety and health administration regulating working conditions

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21
Q

Friction factor

A

Factor used to calculate loss of pressure of a gas or liquid fluid through ducts or pipes

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22
Q

Therm

A

Unit equal to 100,000 BTUs

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23
Q

Flame spread classes

A

Rate at which flame will spread over a surface. Class I has least flame spread, class III the most

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24
Q

Heat of fusion

A

Heat given off by a liquid in changing to a solid or heat absorbed by a solid melting to a liquid… Without change in temp.

25
Q

Ball check valve

A

Spring-operated check valve in a piping system in which pressure against a movable ball allows fluid to flow in one direction. When it flows in the other it closes ball against a seat and interrupts flow.

26
Q

Star connection

A

Method of connecting the windings on a 3-phase transformer in which one end of all three windings is connected to a common neutral center point, forming a Y shape. Also known as a wye connection.

27
Q

Interceptor

A

Device traps grease sand hand string etc. installed in certain drains.

28
Q

Globe thermometer measures….

A

Mean radiant temp

29
Q

Building authorization

A

Control by automatic equip of a number of bldg functions, usually including HVAC

30
Q

Neutral

A

Wire or conductor equidistant on voltage from the phase conductors of the systems… Not the same as ground

31
Q

U factor or U value

A

Overall rate of heat flow of a particular wall section, expressed on BTUs per hour per degree F per square foot

32
Q

Concentrating collector

A

Device to collect solar energy, usually

Parabolic in shape, for concentration isolation to achieve high temperatures

33
Q

Coefficient of performance COP

A

Ratio of heat delivered by a heat pump to the amount of energy supplied. (Or amount of energy removed by a refrigeration machine to the energy expended in removal). Similar to
Efficiency but sometimes
Exceeding 100% so it is expressed
As a number.

34
Q

Typical COP for a heat pump

A

2.7

35
Q

Ballast

A

Electrical device providing starting voltage and regulating current flow in fluorescent and other lamps

36
Q

Underwriters loop

A

Plumbing arrangement on steam boilers to avoid rapid loss of water in the boiler due to a break in the condensate return line. Also. Hartford loop.

37
Q

Fixture unit

A

Unit of liquid flow used in sizing supply and drainage pipes. Equal to
1 cubic foot per minute or 7.5 gallons per minute

38
Q

Manometer

A

U-shaped tube partially filled with a liquid, used for measuring the pressure of a fluid

39
Q

Aspect ratio – what 2 things does it relate to?

A

Ratio of the longer to shorter dimension of a duct which affects duct friction or of a room which relates to light reflection

40
Q

Balancing damper

A

Damper provided to regulate flow when system is being balanced or tuned to design requirements

41
Q

dBA

A

Decibel measured in the A scale, weighted to account for the special sensitivities of the human ear.

42
Q

Cooling tower

A

Structure to evaporatively cool a liquid by contact with air.

43
Q

Fusible sprinkler head

A

Sprinkler head normally closed by a plug I f low melting point alloy which melts at a predetermined temp

44
Q

Pitch… Is and depends on what factors

A

Tone of sound dependent primarily on frequency and somewhat on sound pressure and waveform

45
Q

Two pipe system

A

Hot or chilled water system having only one supply and one return line. It can supply heated or chilled water to a zone but not both at the same time.

46
Q

Grain

A

Unit of weight, where 7000 grains = one pound; used primarily as a measure of the weight of moisture in air.

47
Q

Emissivity

A

Rate at which a surface material at given temp radiates/emits energy. Varies from 0.0 to 1.0, where 1.0 is the theoretical emissivity of a perfect black box

48
Q

Capacitance … Measured in

A

Measure of the ability of two or more closely spaced plates to store
Electricity. Measured in farads

49
Q

Three phase

A

Describing a form of alternating current produced by a generator having three rotating coils positioned 120 degrees apart

50
Q

Efficacy

A

Ratio of lumens emitted by a lamp to the electrical power consumed by the lamp

51
Q

Mass Law

A

Theoretical law stating that for ea doubling of mass in a wall there is a 6dB drop in the amount of sound transmitted… In actuality it’s closer to 5

52
Q

Another word for a downspout

A

A leader

53
Q

Sound level meter

A

Measures sound pressure on dB and gives a reading

54
Q

Sone

A

Subjective system of measuring loudness based on the reference point of one some equal to a sounds pressure level of 40 dB

55
Q

Photometry

A

Measurement of light distribution, illumination, and intensity, usually with a photometer.

56
Q

Inductance

A

The property of an electrical current by which a change in current induces an electromotive force. The unit of
Inductance on the Henry.

57
Q

Total heat… Also known as…

A

Total sensible and latent stored in the air… Also known as

Enthalpy

58
Q

cfm

A

Cubic feet per minute, flow rate of air in a mech duct

59
Q

Psychrometer in chart involves

A

Wet bulb, dry bulb, dew point temp, relative and absolute humidities, enthalpy, and sensible heat ratio

60
Q

What does sound energy turn onto

When it is absorbed ?

A

Usually heat

ARE Building Systems (15 decks)

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