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Title: State-of-the-Art for Hygrothermal Simulation Tools

Abstract

The hygrothermal (heat and moisture) performance of buildings can be assessed by utilizing simulation tools. There are currently a number of available hygrothermal calculation tools available which vary in their degree of sophistication and runtime requirements. This report investigates three of the most commonly used models (WUFI, HAMT, and EMPD) to assess their limitations and potential to generate physically realistic results to prioritize improvements for EnergyPlus (which uses HAMT and EMPD). The outcome of the study shows that, out of these three tools, WUFI has the greatest hygrothermal capabilities. Limitations of these tools were also assessed including: WUFI’s inability to properly account for air leakage and transfer at surface boundaries; HAMT’s inability to handle air leakage, precipitationrelated moisture problems, or condensation problems from high relative humidity; and multiple limitations for EMPD as a simplified method to estimate indoor temperature and humidity levels and generally not used to estimate the hygrothermal performance of the building envelope materials. In conclusion, out of the three investigated simulation tools, HAMT has the greatest modeling potential, is open source, and we have prioritized specific features that can enable EnergyPlus to model all relevant heat and moisture transfer mechanisms that impact the performance of building envelopemore » components.« less

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1407999
Report Number(s):
ORNL/TM-2017/92
73069
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 97 MATHEMATICS AND COMPUTING

Citation Formats

Boudreaux, Philip R., New, Joshua Ryan, Shrestha, Som S., Adams, Mark B., and Pallin, Simon B. State-of-the-Art for Hygrothermal Simulation Tools. United States: N. p., 2017. Web. doi:10.2172/1407999.
Boudreaux, Philip R., New, Joshua Ryan, Shrestha, Som S., Adams, Mark B., & Pallin, Simon B. State-of-the-Art for Hygrothermal Simulation Tools. United States. doi:10.2172/1407999.
Boudreaux, Philip R., New, Joshua Ryan, Shrestha, Som S., Adams, Mark B., and Pallin, Simon B. Wed . "State-of-the-Art for Hygrothermal Simulation Tools". United States. doi:10.2172/1407999. https://www.osti.gov/servlets/purl/1407999.
@article{osti_1407999,
title = {State-of-the-Art for Hygrothermal Simulation Tools},
author = {Boudreaux, Philip R. and New, Joshua Ryan and Shrestha, Som S. and Adams, Mark B. and Pallin, Simon B.},
abstractNote = {The hygrothermal (heat and moisture) performance of buildings can be assessed by utilizing simulation tools. There are currently a number of available hygrothermal calculation tools available which vary in their degree of sophistication and runtime requirements. This report investigates three of the most commonly used models (WUFI, HAMT, and EMPD) to assess their limitations and potential to generate physically realistic results to prioritize improvements for EnergyPlus (which uses HAMT and EMPD). The outcome of the study shows that, out of these three tools, WUFI has the greatest hygrothermal capabilities. Limitations of these tools were also assessed including: WUFI’s inability to properly account for air leakage and transfer at surface boundaries; HAMT’s inability to handle air leakage, precipitationrelated moisture problems, or condensation problems from high relative humidity; and multiple limitations for EMPD as a simplified method to estimate indoor temperature and humidity levels and generally not used to estimate the hygrothermal performance of the building envelope materials. In conclusion, out of the three investigated simulation tools, HAMT has the greatest modeling potential, is open source, and we have prioritized specific features that can enable EnergyPlus to model all relevant heat and moisture transfer mechanisms that impact the performance of building envelope components.},
doi = {10.2172/1407999},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}

Technical Report:

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