Standard 90.1 Energy Standard for Buildings Except Low-Rise Residential Buildings

Question 1

Are the categories “nonmetal framed” and “metal frame” for vertical fenestration separate or combined?

Answer 1

The 2019 edition combined them

Question 2

The 2019 edition allows for a more simplified method for lighting. What building size does this apply to?

Answer 2

Buildings up to 25,000 SF

Question 3

What types of buildings does 90.1 not apply to?

Answer 3

Low rise (under 3 stories), sing-family homes, mobile homes

Question 4

Define: Annual fuel utilization efficiency (AFUE)

Answer 4

heat generated vs fuel used, presented as a %. A higher percentage means a higher efficiency

Question 5

Define: baseline building design

Answer 5

computer representation of a hypothetical design based on the proposed design

Question 6

Define: best efficiency point (BEP)

Answer 6

the pump hydraulic power operating point that results in maximum efficiency.

Question 7

Define: modulating boiler:

Answer 7

A boiler that is capable of more than a single firing rate in response to varying temperatures. Sometimes up to 70 or 80, allowing for more control.

Question 8

What does a packaged boiler include?

Answer 8

Shipped complete with heating equipment, mechanical draft equipment, and automatic controls.

Question 9

Define: branch circuit

Answer 9

A branch circuit is part of the electrical system that originates at the main service panel and feeds electricity throughout the structure.

Question 10

Define: bubble point

Answer 10

The refrigerant liquid saturation temperature at a specified pressure.

Question 11

Define: fenestration

Answer 11

The arrangement of windows and doors on the elevations of a building

Question 12

Explain: low-emissivity coating

Answer 12

Also known as “low e coating” for windows - silver oxide applied to the glass between the panes to help contain heat.

Question 13

Low emissivity coating is not required when…

Answer 13

existing glazing already has a low emissivity coating

Question 14

Explain: U-factor

Answer 14

A window or door’s installation value

Question 15

Explain: SHGC (Solar Heat Gain Coefficient)

Answer 15

Solar Heat Gain Coefficient – measurement of how much radiant heat that comes through a window. Heat from the sun. Numbers fall between 0-1, the lower the number, the less heat goes through.

Question 16

A building does not need revolving or if…

Answer 16

There is a vestibule separating conditioned from unconditioned space.

Question 17

Are vestibules required in all climate zones?

Answer 17

No, some exceptions include buildings under 1000SF in Climate Zones 0,4,5,6,7,8

Question 18

Explain: R-value

Answer 18

The resistance of heat transfer through the insulation

Question 19

Solar Reflectance Index (SRI)

Answer 19

Combination of emissivity and initial solar reflectance

Question 20

What size of buildings require vestibules?

Answer 20

Generally speaking, buildings over 40K SF

Question 21

Define: Thermal emittance

Answer 21

Thermal emittance refers to the ratio of the degree of radiant deflection of heat of a given object to that of a standard reference black body. It describes the degree to which a material can radiate the heat it absorbs.

Thermal emittance (ɛ) characterizes the surface capability to reemit the previously absorbed heat away from itself.

Among the three basic forms of heat transfer - conduction, convection, and radiation - the term emittance refers to a material’s ability to release heat through radiation.