skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Impact of post-rainfall evaporation from porous roof tiles on building cooling load in subtropical China

Abstract

Rainfall occurs frequently in subtropical regions of China, with the subsequent water evaporation from building roofs impacting the thermal performance and the energy consumption of buildings. In this paper, we proposed a novel simulation method using actual meteorological data to evaluate this impact. New features were developed in EnergyPlus to enable the simulation: (1) an evaporation latent heat flux source term was added to the heat balance equation of the external surface and (2) algorithms for the evaporative cooling module (ECM) were developed and implemented into EnergyPlus. The ECM experimental results showed good agreement with the simulated results. The ECM was used to assess the impact of evaporation from porous roof tiles on the cooling load of a one-floor building in subtropical China. The results show that the evaporation process decreased the maximal values of the external and internal roof surface temperatures by up to 6.4 °C and 3.2 °C, respectively, while the lower internal surface temperature decreased the room accumulated cooling load by up to 14.8% during the hot summer period. Lastly, the enhanced EnergyPlus capability can be used to evaluate the evaporative cooling performance of roofs with water-storage mediums, as well as to quantify their impact on buildingmore » cooling loads.« less

Authors:
 [1];  [2]; ORCiD logo [2];  [1];  [1]
  1. South China University of Technology, Guangzhou (China)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); South China Univ. of Technology, Guangzhou, Guangdong (China)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B); National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1506357
Alternate Identifier(s):
OSTI ID: 1495496
Grant/Contract Number:  
AC02-05CH11231; 51678243; 51378210; 2016A030313506; 2015ZC14; 2018ZA01; 2017ZD017; 2017ZD039
Resource Type:
Accepted Manuscript
Journal Name:
Applied Thermal Engineering
Additional Journal Information:
Journal Volume: 142; Journal Issue: C; Journal ID: ISSN 1359-4311
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; Rainfall event; Evaporative cooling; EnergyPlus; Building energy simulation; Cooling load; Subtropical China; 54 ENVIRONMENTAL SCIENCES

Citation Formats

Zhang, Lei, Zhang, Rongpeng, Hong, Tianzhen, Zhang, Yu, and Meng, Qinglin. Impact of post-rainfall evaporation from porous roof tiles on building cooling load in subtropical China. United States: N. p., 2018. Web. doi:10.1016/j.applthermaleng.2018.07.033.
Zhang, Lei, Zhang, Rongpeng, Hong, Tianzhen, Zhang, Yu, & Meng, Qinglin. Impact of post-rainfall evaporation from porous roof tiles on building cooling load in subtropical China. United States. doi:10.1016/j.applthermaleng.2018.07.033.
Zhang, Lei, Zhang, Rongpeng, Hong, Tianzhen, Zhang, Yu, and Meng, Qinglin. Sat . "Impact of post-rainfall evaporation from porous roof tiles on building cooling load in subtropical China". United States. doi:10.1016/j.applthermaleng.2018.07.033. https://www.osti.gov/servlets/purl/1506357.
@article{osti_1506357,
title = {Impact of post-rainfall evaporation from porous roof tiles on building cooling load in subtropical China},
author = {Zhang, Lei and Zhang, Rongpeng and Hong, Tianzhen and Zhang, Yu and Meng, Qinglin},
abstractNote = {Rainfall occurs frequently in subtropical regions of China, with the subsequent water evaporation from building roofs impacting the thermal performance and the energy consumption of buildings. In this paper, we proposed a novel simulation method using actual meteorological data to evaluate this impact. New features were developed in EnergyPlus to enable the simulation: (1) an evaporation latent heat flux source term was added to the heat balance equation of the external surface and (2) algorithms for the evaporative cooling module (ECM) were developed and implemented into EnergyPlus. The ECM experimental results showed good agreement with the simulated results. The ECM was used to assess the impact of evaporation from porous roof tiles on the cooling load of a one-floor building in subtropical China. The results show that the evaporation process decreased the maximal values of the external and internal roof surface temperatures by up to 6.4 °C and 3.2 °C, respectively, while the lower internal surface temperature decreased the room accumulated cooling load by up to 14.8% during the hot summer period. Lastly, the enhanced EnergyPlus capability can be used to evaluate the evaporative cooling performance of roofs with water-storage mediums, as well as to quantify their impact on building cooling loads.},
doi = {10.1016/j.applthermaleng.2018.07.033},
journal = {Applied Thermal Engineering},
number = C,
volume = 142,
place = {United States},
year = {2018},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

Save / Share: