Evaluating insulation, glazing and airtightness options for passivhaus enerphit retrofitting of a dwelling in China’s hot summer–cold winter climate region

Liu, Chenfei, Sharples, Stephen and Mohammadpourkarbasi, Haniyeh 2021. Evaluating insulation, glazing and airtightness options for passivhaus enerphit retrofitting of a dwelling in China’s hot summer–cold winter climate region. Energies 14 (21) , 6950. 10.3390/en14216950

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Abstract

Passivhaus EnerPHit is a rigorous retrofit energy standard for buildings, based on high thermal insulation and airtightness levels, which aims to significantly reduce building energy consumption during operation. However, extra retrofit materials are required to achieve this standard, which raises a contradiction between how to balance the environmental impacts of the retrofitting material inputs and extremely low energy consumption after retrofit. This motivated the analysis in this paper, which aimed to evaluate the possibilities of reducing the required retrofitting material inputs when trying to achieve the EnerPHit energy standard using a typical suburban dwelling in China’s hot summer–cold winter climate region as a case study. Firstly, how the insulation performance of each envelope component affected the building’s energy consumption was analysed. Based on this, sensitivity simulations of combinations of different insulation levels with different fabric components were investigated under four scenarios of insulation levels, airtightness and glazing choice. The final proposed retrofitting plans achieved the EnerPHit standard with insulation materials’ savings between 18% to 58% compared to a baseline retrofit plan, and this led, in turn, to 3.9 to 12.6 tonnes of carbon reductions. Moreover, an energy-saving of 87% in heating and 70% in cooling was achieved compared with the pre-retrofit dwelling.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Architecture
Publisher:	MDPI
Date of Acceptance:	20 October 2021
Last Modified:	03 Dec 2024 14:30
URI:	https://orca.cardiff.ac.uk/id/eprint/174426

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