Evaluating the potential energy savings of retrofitting low-rise suburban dwellings towards the Passivhaus EnerPHit standard in a hot summer/cold winter region of China

Liu, Chenfei; Mohammadpourkarbasi, Haniyeh; Sharples, Steve

doi:10.1016/j.enbuild.2020.110555

Cited by 21 publications

(20 citation statements)

References 15 publications

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“…Therefore, it is necessary to evaluate different strategies according to the climate in order to achieve PH. In tropical climates, the main strategy entails cooling and dehumidification [30]; in China, the use of an mechanical ventilation with heat recovery ( MVHR) system is essential [31], and for all types of climates in Germany, Romania, and Ukraine, energy demand increases as latitude increases, so this strategy aims to increase insulation levels based on location [32]. On the other hand, studies show that to achieve PH, it is necessary to place special emphasis on summer overheating and on shading strategies to achieve thermal comfort [33].…”

Section: Methodsmentioning

confidence: 99%

Energy, Economic, and Environmental Performance of a Single-Family House in Chile Built to Passivhaus Standard

et al. 2021

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The energy consumption of buildings accounts for 22% of total global energy use and 13% of global greenhouse gas emissions. In this context, this study aims to evaluate the energy, economic, and environmental performance of housing in Chile built according to the Passivhaus (PH) standard. The standard was applied to housing in eight representative climate zones with a single-family residence as reference. The analysis incorporated passive strategies, which are considered as pillars of the PH. The energy performance was analyzed using the Passive House Planning Package software (PHPP), version 9.6a. The results showed that when every passive strategy is implemented, the heating energy demand decreases by 93%, while the refrigeration demand is nonexistent. These results were achieved through a 37% increase in the overall initial budget investment, which will be amortized over an 11-year period. In this way, the primary energy consumption is reduced by 32% and, correspondingly, CO2 emissions are reduced by 39%. In modern Chile, it is difficult (but not impossible) to incorporate PH. However, governmental programs and aids could represent an initial step. Therefore, this research will help to identify strategies for incorporating PH in Chile, with the aim of improving the energy performance of housing.

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Section: Methodsmentioning

confidence: 99%

Energy, Economic, and Environmental Performance of a Single-Family House in Chile Built to Passivhaus Standard

et al. 2021

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“…A previous analysis of the case building [12] suggested an annual heating demand of 150.6 kWh/m 2 a and cooling demand of 42 kWh/m 2 a under the pre-retrofit status. Then, a simulated retrofitting process was carried out, which involved insulating the entire envelope with 250 mm of Rockwool, improving the airtightness level to 0.6 ach and adopting a mechanical ventilation system with a sensible and latent heat recovery efficiency of 85% and 80%, respectively.…”

Section: Short Review Of the Previous Researchmentioning

confidence: 96%

“…Moreover, as the transparent areas in a façade can be a weak point for the thermal envelope, Passivhaus EnerPHit requires windows with particularly low U-values of around 0.7 W/m 2 K to 0.85 W/m 2 K [14]. Therefore, the energy consumption required by EnerPHit is much lower than that of traditional buildings in the same climate due to the coordination of all the energy-saving measures [12]. There are many global examples of Passivhaus buildings, such as in Sweden [15], the UK [16], Austria [17], Brazil [18] and China [19], which have all demonstrated that large amounts of energy could be saved by achieving this standard.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The thermal performance of the case building was considered poor because no insulation material was used in the envelope, and the windows were single glazed. The airtightness level was estimated to be 3 ach, based on a previous study [12], and Table 1 gives the construction details of each envelope component and their U-value. For this study, local climate data were recorded around the case study building for one year between July 2018 and June 2019.…”

Section: Case Studymentioning

confidence: 99%

“…For the case building in this research, a previous study by the authors [12] had proposed a retrofitting plan based on the Passivhaus concept and Chinese built Passivhaus projects experience. Retrofitting strategies included heat retention to the whole envelope and reducing air leakage, followed by using an efficient heating and ventilation system.…”

Section: Introductionmentioning

confidence: 99%

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Evaluating Insulation, Glazing and Airtightness Options for Passivhaus EnerPHit Retrofitting of a Dwelling in China’s Hot Summer–Cold Winter Climate Region

2021

Self Cite

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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.

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Laminated glazing for buildings: energy saving, natural daylighting, and CO2 emission mitigation prospective

Maduru

Shaik

2021

Environ Sci Pollut Res

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Evaluating the potential energy savings of retrofitting low-rise suburban dwellings towards the Passivhaus EnerPHit standard in a hot summer/cold winter region of China

Cited by 21 publications

References 15 publications

Energy, Economic, and Environmental Performance of a Single-Family House in Chile Built to Passivhaus Standard

Energy, Economic, and Environmental Performance of a Single-Family House in Chile Built to Passivhaus Standard

Evaluating Insulation, Glazing and Airtightness Options for Passivhaus EnerPHit Retrofitting of a Dwelling in China’s Hot Summer–Cold Winter Climate Region

Laminated glazing for buildings: energy saving, natural daylighting, and CO2 emission mitigation prospective

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