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HVAC Systems_FA23 > [L4]_Space Loads > Flashcards

[L4]_Space Loads Flashcards

1
Q

IND405

What is the definition of U-Factor?

[L4]

A

The rate at which heat flowsthrough a specific material or a building section.

[L4]

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2
Q

IND405

What is the definition of R-Value?

[L4]

A

The rate and ability of one specific material, or a group of materials in a building section, to resist heat flowthrough them.

[L4]

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3
Q

IND405

What are the typical heat transfer loss rate % through each building assembly?

[L4]

A
  • Roof = 25%
  • Glazing = 10%
  • Doors = 15%
  • Exterior Walls = 35%
  • Floors = 15%

[L4]

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4
Q

IND405

What is the definition of K-Value?

[L4]

A

The thermal conductivity property of a specific homogenous material.

[L4]

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5
Q

IND405

List the four (4) methods to calculate overall heat transfer coefficient.

[L4]

A
  1. Thermal conductivity (k) and thicknesses of all homogenous materials
  2. Thermal conductivity (k) and thicknesses of all non-homogenous materials
  3. Surface conditions of both sides of construction (inside & outside)
  4. Potential air gaps and spaces within the construction

[L4]

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6
Q

IND405

What is the highest insulation material name and r-value?

[L4]

A

Polyisocyanurate or PolyIso (Foil-Faced) & 7.2 R-Value

[L4]

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7
Q

IND405

What is typically the cheapest and easiest insulation to install?

[L4]

A

Fiberglass Batt Insulation

[L4]

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8
Q

IND405

How much reduction of heat transfer can be achieved in windows with properly installed shading (blinds) devices?

[L4]

A

Up to possibly 25%

[L4]

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9
Q

IND405

True or False: An entire homogenous wall assembly of the same materials versus a non-homogenous wall assembly have the same r-values?

[L4]

A

False, non-homogenous wall assembilies can have different % of materials for components based on total composition resulting in a different overall r-value.

[L4]

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10
Q

IND405

True or False: When calculating the total wall assembly R-Value any interior/exterior air films and core air gap insulation values must be selected properly and included in the overall calculation?

[L4]

A

True.

[L4]

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11
Q

IND405

What is the component temperature for the inside layer of the brick?

[L4]

A

34.1°F

[L4]

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12
Q

IND405

What are the four (4) basic mechanisms which energy use occurs through building fenestration?

[L4]

A
  1. Thermal Heat Transfer
  2. Solar Heat Gain
  3. Air Leakage/Ventilation/Exchange
  4. Daylighting

[L4]

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13
Q

IND405

What is fenestration?

[L4]

A

Fenestration is another term to describe windows or aka glazing.

[L4]

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14
Q

IND405

What is laminated glass?

[L4]

A

Glazing made of two (2) panes of glass adhered together and the interlayer
between the two (2) panes of glass is typically plastic and may be clear, tinted, or coated.

[L4]

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15
Q

IND405

What is a Low-E coating?

[L4]

A

An internal glazing coating that reduce UV and or radiant heat exchange.

[L4]

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16
Q

IND405

In a passive house (Hauss) structure, typically how many panes does a glazing assembly have?

[L4]

A

Three (3), a triple pane window.

[L4]

17
Q

IND405

Does a thermal break in a window frame mean the total insulation value of the window is increased or lowered?

[L4]

A

Total insulation value of the window is greater with a thermal break.

[L4]

18
Q

IND405

What are the two (2) typical noble gases used to insulate windows?

[L4]

A
  1. Krypton
  2. Argon

[L4]

19
Q

IND405

What is the typical wind speed used to specify outdoor air-films on windows and buildings?

[L4]

A

15-mph

[L4]

20
Q

IND405

In a typical building wall assembly what is the name of the membrane that separates moisture from exterior to interior spaces?

[L4]

A

The vapor barrier

[L4]

21
Q

IND405

What is GST?

[L4]

A

Ground Surface Temperature, the annual mean temperature value over the entire winter of the specified location.

[L4]

22
Q

IND405

What part of slab-on-grade surface does heat loss occur the most?

[L4]

A

The perimeter.

[L4]

23
Q

IND405

What is a buffer space?

[L4]

A

The buffer space is an adjacent zone between occupied and unoccupied spaces aka partitioned space.

[L4]

24
Q

IND405

What is the internal heat gain formula from light fixtures?

[L4]

A

Qel = 3.41 * W * Ful * Fsa

[L4]

25
Q

IND405

What does LPD mean?

[L4]

A

Lighting Power Density

[L4]

26
Q

IND405

How do you estimate the correct heat gain from existing installed cooking appliances?

[L4]

A

Check the nameplate of the cooking appliance and cross-reference heat gain values from ASHRAE tables based on system size.

[L4]

27
Q

IND405

Do all commercial cooking appliances produce sensible and latent heat during operation?

[L4]

A

No. Only cooking appliances which introduce steam for cooking or warming items.

[L4]

28
Q

IND405

In a commercial kitchen, what is the % of hot & humid air is given off by radiation?

[L4]

A

32% Radiation

[L4]

29
Q

IND405

What is the type of fire supression system used for commercial kitchens?

[L4]

A

Dry Chemical (Ansul System)

[L4]

30
Q

IND405

What does HF stand for?

[L4]

A

Heating Load Factor

[L4]

HVAC Systems_FA23 (11 decks)

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