Article #1321 - Building Energy Codes Glossary - U
This listing contains terms and acronyms that are used throughout the BECP website and compliance tools.
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U-Factor
A measure (Btu/h ft2 °F) of how well a material or series of materials conducts heat. U-factors for window and door assemblies are the reciprocal of the assembly R-value. The smaller the number, the less the heat flow.
UA
U-factor X area; REScheck performs a simple UA calculation for each building assembly to determine the overall UA of your building. The UA that would result from a building conforming to the code requirements is compared against the UA for your building. If the total heat loss (represented as a UA) through the envelope of your building does not exceed the total heat loss from the same building conforming to the code, then the software declares that you pass. A high-efficiency equipment trade-off can also be performed under certain codes.
UL
Underwriters Laboratories Inc.
UL 181A/B
A test procedure for tapes and mastics used to seal ductwork.
Unconditioned Space
An enclosed space within a building that is not a conditioned space.
Unenclosed Space
A space that is not an enclosed space.
Unit Energy Costs
Costs for units of energy or power purchased at the building site. These costs may include energy costs as well as costs for power demand as determined by the adopting authority.
Unitary Cooling Equipment
One or more factory-made assemblies that normally include an evaporator or cooling coil and a compressor and condenser combination. Units that perform a heating function are also included.
Unitary Heat Pump
One or more factory-made assemblies that include an indoor conditioning coil, compressor(s) and outdoor coil or refrigerant-to-water heat exchanger, including means to provide both heating and cooling functions. When heat pump equipment is provided in more than one assembly, the separate assemblies shall be designed to be used together.
Unitary Heating and Cooling
One or more factory-made assemblies that include an evaporator or cooling coil, a compressor and condenser combination, and that shall be permitted to include a heating function as well. When heating and cooling equipment is provided in more than one assembly, the separate assemblies shall be designed to be used together.
Unitary Packaged
Each package is a standalone system which provides all of the heating and cooling requirements for the area of the building that it serves.
UV
Ultraviolet.