## What is the ASHRAE Standard 140?

## What is Anansi/ASHRAE 140-2017?

- ANSI/
**ASHRAE**Standard**140**-2017 Standard Method of Test for the Evaluation of Building Energy Analysis Computer Programs These standard test procedures apply to building energy computer programs that calculate the thermal performance of a building and its mechanical systems.

## What is the confidence interval in ashashrae 140?

**ASHRAE**standard**140**suggests a confidence interval, which describes a reasonable threshold of economic uncertainty. It means the energy analysis of software disagreements within this range would result in relatively insignificant utility cost disagreements based on principal fuel charges.

## How well do PHPP results match ASHRAE 140?

- For a total of 38 test cases described by
**ASHRAE 140**, PHPP results were within the confidence interval of the reference software for all but one case, which modelled the impact of a south window overhang on cooling energy demand. PHPP V9.6 Validation using ANSI/**ASHRAE**Standard**140**-2017 vi

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