Brembilla_0143624419889057.pdf (1002.94 kB)
Balancing daylight and overheating in low-energy design using CIBSE improved weather files
journal contribution
posted on 2019-11-01, 11:32 authored by Eleonora Brembilla, Christina Hopfe, John MardaljevicJohn Mardaljevic, Anastasia Mylona, Eirini MantesiA new set of CIBSE weather files for Building Performance Simulation (BPS) was recently developed to address the
need for better quality solar data. These are essential for most BPS applications, particularly for daylighting studies
and low energy building design, which requires detailed irradiation data for passive solar design and overheating risk
analysis. The reliability of weather data becomes paramount when building performance is pushed to its limits.
Findings illustrate how principles of good window design can be applied to a case study building, built to the Passivhaus
standard, and how its expected performance is affected by the quality of solar irradiation data. Analyses using Test
Reference Years (TRY) were most affected by changes in the solar radiation model (up to 8.3 percent points), whereas
for Design Summer Years (DSY) the maximum difference was 1.7 percent points. Adopting the new model caused
overheating risk to be classified as more severe using TRYs than DSYs, prompting a discussion on the DSY selection
method. Irradiance data measured on site were used as a benchmark to evaluate the new solar radiation model, which
was found to significantly improve the accuracy of irradiance data within weather files and so the reliability of overheating
assessments. Practical Application: CIBSE weather files are widely used for compliance verification of building performance in the UK context. This paper tests how the introduction of a new solar radiation model in weather files will affect daylighting and overheating simulation results. Examples are given on how low energy building design considerations driven by advanced simulation techniques can help reaching indoor visual and thermal comfort requirements.
Funding
Chartered Institution of Building Services Engineers (CIBSE)
History
School
- Architecture, Building and Civil Engineering
Published in
Building Services Engineering Research and TechnologyVolume
41Issue
2Pages
10-224Publisher
SAGE PublicationsVersion
- VoR (Version of Record)
Rights holder
© The AuthorsPublisher statement
This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).Acceptance date
2019-10-28Publication date
2019-11-14Copyright date
2020ISSN
0143-6244eISSN
1477-0849Publisher version
Language
- en
Depositor
Eleonora Brembilla. Deposit date: 29 October 2019Usage metrics
Categories
No categories selectedKeywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC