Section 322.10. Definitions.

 

(1)  "Air-impermeable" means having an air permeance less than or equal to 0.02 L/s-m 2 at a pressure differential of 75 pascals when tested according to ASTM E 2178 or ASTM E 283.

(2)  "Conditioned floor area" means the sum of areas of all floors in conditioned space in the structure, including basements, cellars, and intermediate floored levels measured from the exterior faces of exterior walls or from the center line of interior walls, excluding covered walkways, open roofed-over areas, porches, exterior terraces or steps, chimneys, roof overhangs and similar features.

(3)  "Conditioned space" means space within the dwelling thermal envelope which is provided with heated air or surfaces to provide a heated space capable of maintaining the temperature of the space to at least 50 ° F at design conditions.

(4)  "Crawl space wall" means the opaque portion of a wall which encloses a crawl space and is partially or totally below grade.

(5)  "Dwelling thermal envelope" means the elements of a dwelling with enclosed conditioned space through which thermal energy may be transferred to or from unconditioned space or the exterior.

(6)  "Exterior wall area" means the normal projection of the dwelling envelope wall area bounding interior space which is conditioned by an energy-using system including opaque wall, window and door area. Any skylight shaft walls that are 12 inches or more in depth, measured from the ceiling plane to the roof deck, are considered in the area of exterior walls and are not considered part of the roof assembly.

(7)  "Heated slab" means a floor slab in which an uninsulated heating element, uninsulated hydronic tubing or uninsulated hot air distribution system is in contact with the slab or placed within the slab or the subgrade.

(8)  "HVAC" means heating, ventilating and air conditioning.

(9)  "HVAC system" means the equipment, distribution network, and terminals that provide either collectively or individually the processes of heating, ventilating, or air conditioning to a building.

(10)  "Infiltration" means the uncontrolled inward air leakage through cracks and interstices in any dwelling element and around windows and doors of a dwelling caused by the pressure effects of wind, and the effect of differences in the indoor and outdoor air density.

(11)  "IC-rated" means an electrical fixture tested and listed by an independent testing laboratory as being suitable for installation in a cavity where the fixture may be in direct contact with thermal insulation or combustible materials.

(12)  "Mass wall" means a wall of concrete block, concrete, insulated concrete forms, masonry cavity, brick other than brick veneer, earth and solid timber or logs.

(13)  "Opaque areas" means all exposed areas of a dwelling envelope which enclose conditioned space except openings for windows, skylights, doors and dwelling service systems.

(14)  "Proposed design" means a description of the proposed dwelling used to estimate annual energy use for determining compliance based on total building performance.

(15)  "Renewable energy sources" means sources of energy, excluding minerals and petroleum products, derived from incoming solar radiation, trees and other plants, wind, waves and tides, lake or pond thermal differences and from the internal heat of the earth.

(16)  "Roof assembly" means all components of the roof and ceiling envelope through which heat flows, thus creating a building transmission heat loss or gain, where such assembly is exposed to outdoor air and encloses a heated space. Any skylight shaft walls less than 12 inches in depth, as measured from the ceiling plane to the roof deck, are considered in the roof assembly and are not considered in the area of exterior walls.

(17)  "Sun room" means a one-story structure attached to a dwelling with a glazing area in excess of 40% of the gross area of the structure's exterior walls and roof and with any screened areas capable of being covered or replaced with glazing during the heating season.

(18)  "System" means a combination of central or terminal equipment and their components, controls, accessories, interconnecting means, and terminal devices by which energy is transformed so as to perform a specific function, such as HVAC, water heating, or illumination.

(19)  "Thermal resistance" or "R-value" means a measure of the ability to retard the flow of heat. The R-value is the reciprocal of thermal transmittance or U-factor expressed as R = 1/U.

(20)  "Thermal transmittance" or "U-factor" means the time rate of heat flow through a body or assembly which is located between 2 different environments, expressed in Btu/h • ft. 2 • ° F. The U-factor applies to combinations of different materials used in series along the heat flow path and also to single materials that comprise a dwelling section, including cavity air spaces and air films on both sides of a dwelling element.

(21)  "Thermally isolated" means physically and thermally separated with separate zone or separate equipment controls for space heating.

(22)  "Thermostat" means an automatic control device actuated by temperature and designed to be responsive to temperature.

(23)  "Ventilation" means the process of supplying or removing air by natural or mechanical means to or from any space. The air may or may not have been conditioned.

(24)  "Zone" means a space or group of spaces within a dwelling with heating requirements sufficiently similar so that comfort conditions can be maintained throughout by a single controlling device.

CR 08-043 : cr. Register March 2009 No. 639 , eff. 4-1-09; CR 09-104 : am. (17) Register December 2010 No. 660 , eff. 1-1-11.

Note

A thermally isolated sun room does not count in the calculation of amount of glazing. Microsoft Windows NT 6.1.7601 Service Pack 1 The higher the R-value of a material, the more difficult it is for heat to be transmitted through the material. Microsoft Windows NT 6.1.7601 Service Pack 1 The lower the U-factor of a material, the more difficult it is for heat to be transmitted through the material. Microsoft Windows NT 6.1.7601 Service Pack 1 The thermal transmittance is also referred to as the coefficient of heat transfer or the coefficient of heat transmission. Microsoft Windows NT 6.1.7601 Service Pack 1