Overall U-Values and Heating/Cooling Loads - Manufactured Homes
February 1992 (88 pages)
February 1, 1992
This manual specifies a method for calculating the overall thermal transmittance (also referred to as the overall U-value or Uo), heating load, and cooling load of a manufactured (mobile) home. One section presents the Uo worksheet that is used to calculate a home's Uo. Inputs to the Uo worksheet come from data generated in the component worksheets. Separate worksheets are provided for the ceiling, walls, and floor. General rules that govern the calculation of component U-value calculation are provided in another section, and the rules specific to the calculation of each component are discussed. The concluding section details the heating and cooling load calculations. A personal-computer-based spreadsheet is available for use in the calculation of the Uo, heating load, and cooling load of a home and may simplify these calculations. The spreadsheet may be used as an alternative method for the calculation of Uo and loads. Compliance with HUD's Uo and load-calculation regulations contained in Sections 3280.506, 3280.510, and 3280.511 of the Manufactured Home Construction and Safety Standards must be demonstrated through the application of the method presented in the manual. Supplemental information in the appendixes includes definitions of thermal terms, material R-values, load calculation tables, and load calculation weather data.
Note: Guidance documents, except when based on statutory or regulatory authority or law, do not have the force and effect of law and are not meant to bind the public in any way. Guidance documents are intended only to provide clarity to the public regarding existing requirements under the law or agency policies.