Thermal properties optimization of envelope in energy-saving renovation of existing public buildings

Huang, Jianen; Lv, Henglin; Gao, Tao; Feng, Wei; Chen, Yanxia; Zhou, Tao

doi:10.1016/j.enbuild.2014.02.040

Cited by 66 publications

(33 citation statements)

References 32 publications

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“…From design parameter based LSA in previous section, the importance of design parameters to OE of building was understood and it was found that U-value of roof can be the priority target to reduce the OE of building as compared to other design parameters considered in this research, however this information may not result in an energy-efficient optimization process. This is due to EE of element is considerably increased during the optimization of building envelope while increasing the material consumption to satisfy the target thermal properties and reduce OE in buildings [2] [15] [32]. Besides, since the elements made up from different materials with its distinct thermal properties and each element comprised different proportion of EE in the building envelope, it is necessary to understand the uncertainty between thermal properties and EE of building envelope and subsequently the resulted OE-EE relationship of each envelope element.…”

Section: Sensitivity Analysis and Discussionmentioning

confidence: 99%

“…For example, the production of element with lower U-value is an energy-intensive process due to addition of insulation materials for better thermal performance; thereby EE is considerably increased while increasing the material consumption to satisfy the target thermal properties. This concludes that EE increases while attempting to minimize OE in building [2] [7] [9] [15]. The research carried by CSIRO found that as the building becomes more energy efficient, EE in building will approach about half of the LCE [16].…”

Section: Literature Reviewmentioning

confidence: 99%

“…The annual energy consumption was reduced by around 25%. Huang et al [2] studied the impact of window U-value and wall insulation material thickness on building energy consumption by comparing lifecycle energy cost saving. They revealed that window with higher U-value and wall with thicker insulation is more energy-saving design than those of lower U-value and thinner insulation.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The traditional optimization process is time-consuming and complicated since it is generated by the interactions between different design parameters. Besides, previous studies [1] [2] [3] [4] have often performed optimization process based on the thermal properties improvement of design parameter (i.e. U-value of envelope elements, Window-Wall-Ratio (WWR), etc.…”

mentioning

confidence: 99%

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Sensitivity Analysis of Building Envelop Elements Impact on Energy Consumptions Using BIM

Zhang¹,

Ong²

2017

OJCE

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Lots of researches have shown that the optimization of building envelope reduces building energy consumption during its lifecycle. Due to the uncertainty of the relationship between individual design parameters and building performance, the extent of impact cannot be well-understood. Therefore, it is essential to evaluate the impact extent for different design parameters and identify the one (s) that impact (s) more to the building performance and hence focus so as to improve building performance efficiently. In the present research, main design parameters that affect the building performance are selected to analyse the extent of the impact. Material quantities are extracted directly from the Building Information Modelling (BIM) model so as to calculate the embodied energy in material. Moreover, simulation of energy consumption is run for different scenarios during operation stage. Energy embodied in typical construction materials are calculated for each scenario accordingly. Finally, sensitivity analysis is applied to find the extent of impact on life cycle energy of building for the selected design parameters in terms of both embodied energy (EE) and operational energy (OE). A case study of a manufactory plant is carried out to investigate the impact of the selected design parameters.

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Section: Sensitivity Analysis and Discussionmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

mentioning

confidence: 99%

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Sensitivity Analysis of Building Envelop Elements Impact on Energy Consumptions Using BIM

Zhang¹,

Ong²

2017

OJCE

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“…Different customers have different heat load characteristics and it is therefore sometimes rather complicated to satisfy all customers' demands with one temperature level lower than 80°C in the supply line of a DH system. One should also take into account the different types of structures being built during recent decades, as well as buildings at random stages of renovation [21,22,27,28]. At the same time, a DH system should be competitive and cost-effective.…”

Section: Introductionmentioning

confidence: 99%

Implementation of CCPP for energy supply of future building stock

Tereshchenko

Nord

2015

Applied Energy

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and Process Engineering, Kolbjørn Hejes vei 1d, NO-7491 Trondheim, Norway h i g h l i g h t sSensitivity analysis was performed under changeable heat demand profiles. Results found high dependency of plant performance from heat load in DH system. CCPP as the most energy efficient conversion plant is suitable for heat supply of high heat density areas. CCPP operate with difficulties in energy supply of low heat density areas. The power production in CCPP is not influenced by the supply temperature control. a b s t r a c tEuropean Directive 2010/31/EU stated that by the end of 2020 all new buildings should be nearly Zero-Energy Buildings (nZEB). Since such buildings require a low quantity of energy for heating, they can utilize energy from the return line of a District Heating (DH) system. Further, this new type of buildings can successfully be integrated into the fourth generation of heat distribution technology, which is the new trend in the DH industry. On the other hand, existing building stock has a service lifetime of around 50 years, indicating that the required supply temperature in the DH system cannot be lowered beneath a certain level. Hereafter, together with new types of buildings and different policies, this could lead to changes in heat demand profiles of the DH system.The above-mentioned situation in the building market will lead to changes in heat load profiles and unavoidably influence the performance indicators of energy conversion units. Therefore, the focus in this paper was devoted to operation analysis of ethanol-based a Combined Heat and Power (CHP) plant with combined cycle technology under changeable demand conditions and different temperature levels in the DH system.In this paper different temperature levels of the DH system together with two temperature control strategies were considered. Further, the analysis included different heat demand profiles. The analysis was performed in Aspen HYSYS simulation software and data post processing was made by MATLAB. The results found that effective plant operation is highly dependent on heat load profile. Temperature control strategies did not induce a significant change in overall power production in CHP. The decrease in the supply temperature did not show a significant impact on plant performance. However, increase in temperature difference between supply and return lines led to higher power production and better overall plant performance. Further, it was concluded that it is rather difficult to operate CCPP connected to low energy building stock. This means that the CCPP is suitable for high-density heat areas, while it has poor energy performance indicators in low heat density areas.

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Assessment of the economic efficiency of energy‐saving projects, methodology based on simple and compound methods

Szafranko

2021

Energy Science & Engineering

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Among different engineering projects, there are ones intended to improve the energy-saving properties of buildings. Both new and much older buildings undergoing refurbishment can be involved. Broadly understood energy-saving projects increasingly often entail renewable energy installations. Every implementation of such an investment project needs to be preceded by an assessment of its economic efficiency. Although the literature provides examples of methods which can serve this purpose, a coherent methodological approach seems lacking. In this article, the author proposes methodology based on several simple and compound methods combined into a schematic assessment procedure. The methodology is presented as applied in a case of typical photovoltaic roof installation to generate electricity for a single-family house. The assessment procedure consists of a few steps leading from a preliminary to a more detailed appraisal. The first stage is an How to cite this article: Szafranko E. Assessment of the economic efficiency of energy-saving projects, methodology based on simple and compound methods.

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Thermal properties optimization of envelope in energy-saving renovation of existing public buildings

Cited by 66 publications

References 32 publications

Sensitivity Analysis of Building Envelop Elements Impact on Energy Consumptions Using BIM

Sensitivity Analysis of Building Envelop Elements Impact on Energy Consumptions Using BIM

Implementation of CCPP for energy supply of future building stock

Assessment of the economic efficiency of energy‐saving projects, methodology based on simple and compound methods

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