Testing with Building Thermal Envelope and Fabric Load Tests - Engineering Assignment Help

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Test Objectives and Overview
1.1 Introduction
This report describes the modeling methodology and results for testing done of building thermal envelope and fabric tests designated as Cases 195 through 960 of ANSI/ASHRAE Standard 140-2011 titled Standard Method of Test for the Evaluation of Building Energy Analysis Computer Programs with the EnergyPlus Version 8.4.0-832e4bb9cb. The results of EnergyPlus are also compared with results from several other whole building energy analysis programs that simulated the same test cases.

1.2 Test Type: Comparative - Loads
Comparative tests compare a program to itself or to other simulation programs. This type of testing accomplishes results on two different levels, both validation and debugging.
From a validation perspective, comparative tests will show that EnergyPlus is computing solutions that are reasonable compared to other energy simulation programs. This is a very powerful method of assessment, but it is no substitute for determining if the program is absolutely correct since it may be just as equally incorrect as the benchmark program or programs. The biggest strength of comparative testing is the ability tocompare any cases that two or more programs can model. This is much more flexible than analytical tests when only specific solutions exist for simple models, and much more flexible than empirical tests when only specific data sets have been collected for usually a very narrow band of operation. The ANSI/ASHRAE Standard 140-2011 procedures discussed below take advantage of the comparative test method and have the added advantage that for the specific tests included in ANSI/ASHRAE Standard 140-2011 have already been run by experts of the other simulation tools.

Comparative testing is also useful for field-by-field input debugging. Energy simulation programs have so many inputs and outputs that the results are often difficult to interpret. To ascertain if a given test passes or fails, engineering judgment or hand calculations are often needed. Field by field comparative testing eliminates any calculational requirements for the subset of fields that are equivalent in two or more simulation programs. The equivalent fields are exercised using equivalent inputs and relevant outputs are directly compared.

1.3 Test Suite: ANSI/ASHRAE Standard 140-2011
The tests described in Section 5.2 of ANSI/ASHRAE Standard 140-2011, Standard Method of Test for the Evaluation of Building Energy Analysis Computer Programs (ANSI/ASHRAE 2011), were performed. This suite of tests is based on work previously performed under an earlier project sponsored by the International Energy Agency (IEA) titled Building Energy Simulation Test (BESTEST) and Diagnostic Method (IEA 1995). As stated in its Foreword, Standard 140-2011 is a standard method of test that “can be used for identifying and diagnosing predictive differences from whole building energy simulation software that may possibly be caused by algorithmic differences, modeling limitations, input differences, or coding errors.”

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