scope:

Purpose of the Addendum

The purpose of this addendum is to update the test cases of Sections 5.2.1, 5.2.2, and 5.2.3 of Standard 140, for testing the ability of whole-building energy simulation programs to model the building thermal fabric. These are software-to-software comparative tests, where simulation results are compared to each other. The tested modeling physics includes conduction, convection, and radiative (solar and infrared) heat transfer associated with various building surfaces (and their related thermal mass), windows, outside-air infiltration/ventilation, internal heat gains, external shading devices, a sunspace, and variations in thermostat control (deadband and setback). The updated test cases are from Update of ASHRAE Standard 140 Section 5.2 and Related Sections (BESTEST Building Thermal Fabric Test Cases), ^A-15 by Argonne National Laboratory (Argonne) and National Renewable Energy Laboratory (NREL) in collaboration with the ASHRAE Standing Standard Project Committee 140 (SSPC 140) and other international software developers and simulation-trial participants. Related project funding for Argonne and NREL was provided by the U.S. Department of Energy.

The test cases of Section 5.2.4 (Ground-Coupled Slab-on-Grade Analytical Verification Tests) are not affected by this addendum and remain as is.