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Balancing daylight and overheating in low-energy design using CIBSE improved weather files

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posted on 01.11.2019 by Eleonora Brembilla, Christina Hopfe, John Mardaljevic, Anastasia Mylona, Eirini Mantesi
A 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 Technology

Volume

41

Issue

2

Pages

10-224

Publisher

SAGE Publications

Version

VoR (Version of Record)

Rights holder

© The Authors

Publisher 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

28/10/2019

Publication date

2019-11-14

Copyright date

2020

ISSN

0143-6244

eISSN

1477-0849

Language

en

Depositor

Eleonora Brembilla. Deposit date: 29 October 2019

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