# Amber Book - Thermal Flashcards

1
Q

What are some common building materials R-Values?

A
2
Q

What is a skin-load dominated building?

A

Buildings where energy consumption is primarily dictated by the influence of the exterior climate on a building’s envelope, or “skin.”

3
Q

What is an internal-load dominated building?

A

Buildings that consume the majority of their energy to provide interior lighting and to provide cooling to counteract the heat given off by people, plug-loads (such as computers), fixtures, and other internal sources.

Usually have a higher mass to surface area ratio. Usually need to be shedding heat year round (hospitals, skyscraper, factories, etc.)

4
Q

What is Solar Heat Gain Coefficient (CHGC) ?

A

The fraction of incident solar radiation admitted through a window, both directly transmitted and absorbed and subsequently released inward.

0 < (SHGC) < 1

High SHGC means lots of solar heat gets through. (0.7-0.9)

Low SHGC means less heat gets through

5
Q

What is a British Thermal Unit (BTU)?

A

The heat required to raise one LB of water one degree Farenheit.

People are emitting ~500 BTU’s an hour (250 latent, 250 sensible)

6
Q

What is a Balance Point Temperature?

A

The temperature of a building interior relative to the outside temperature.

If a building produces a lot of heat internally, it will take a very low outdoor temperature to require heating, therefore it has a LOW balance point temp.

7
Q

What is a Degree Day?

A

a unit of measurement equal to a difference of one degree between the mean outdoor temperature and a reference temperature (65°F). Degree Days are used in estimating the energy needs for heating or cooling a building.

8
Q

What is Conductivity (k)?

A

The rate at which heat passes through a specific material.

Conductors have high k

Insulators have high resistivity and low k

*Inverse of Resistivity 1/k=r and 1/r=k

9
Q

What is the U-Value?

A

The measure of the overall ability of a series of conductive and convective barriers to transfer heat.

The inversion of all the R-values added together

U = 1/(R1+R2+R3)

10
Q

What are the important elements of a passively heated building?

A
• Windows to allow solar radiation
• Well insulated and well-sealed envelope
• Thermal mass to hold heat
11
Q
A