Optimizing the insulation thickness of walls and roofs of existing buildings based on primary energy consumption, global cost and pollutant emissions

Jie, Pengfei; Zhang, Fenghe; Fang, Zhou; Wang, Hongbo; Zhao, Yong

doi:10.1016/j.energy.2018.06.179

Cited by 81 publications

(27 citation statements)

References 49 publications

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“…For the preference coefficient of the integrated weight, there is no explicit computational method. To solve this issue, a new algorithm was proposed to determine the preference coefficient of the integrated weight based on the least square method [35] in this study. The integrated weight algorithm proposed in this study has more explicit physical significance due to application of the least square method, that is, the error sum of the square among integrated, subjective and objective weights achieves the minimum value.…”

Section: Discussionmentioning

confidence: 99%

“…However, the assessment process has two weaknesses: on the one hand, the fuzzy evaluation method does not reflect the randomness of assessment result; on the other hand, the subjective analytic hierarchy process does not take advantage of the objectivity of real data. The cloud model [22][23][24] was introduced to take randomness into consideration, the integrated weight method [33] was adopted, and a new algorithm was proposed to determine the preference coefficient of the integrated weight based on the least square method [35] in this study. To validate the cloud model and integrated weight algorithm for the safety assessment, grey relational analysis [16][17][18] was applied.…”

Section: Framework Of the Proposed Safety Assessment Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Safety Assessment of Casting Workshop by Cloud Model and Cause and Effect–LOPA to Protect Employee Health

Fang

2020

IJERPH

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Safety assessment of a casting workshop will provide a clearer understanding of the important safety level required for a foundry. The main purpose of this study was to construct a composite safety assessment method to protect employee health using the cloud model and cause and effect–Layer of Protection Analysis (LOPA). In this study, the weights of evaluation indicators were determined using the subjective analytic hierarchy process and objective entropy weight method respectively. Then, to obtain the preference coefficient of the integrated weight more precisely, a new algorithm was proposed based on the least square method. Next, the safety level of the casting workshop was presented based on the qualitative and quantitative analysis of the cloud model, which realized the uncertainty conversion between qualitative concepts and their corresponding quantitative values, as well as taking the fuzziness and randomness into account; the validity of cloud model evaluation was validated by grey relational analysis. In addition, cause and effect was used to proactively identify factors that may lead to accidents. LOPA was used to correlate corresponding safety measures to the identified risk factors. 6 causes and 19 sub-causes that may contribute to accidents were identified, and 18 potential remedies, or independent protection layers (IPLs), were described as ways to protect employee health in foundry operations. A mechanical manufacturing business in Hunan, China was considered as a case study to demonstrate the applicability and benefits of the proposed safety assessment approach.

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Section: Discussionmentioning

confidence: 99%

Section: Framework Of the Proposed Safety Assessment Methodsmentioning

confidence: 99%

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Safety Assessment of Casting Workshop by Cloud Model and Cause and Effect–LOPA to Protect Employee Health

Fang

2020

IJERPH

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“…The alternative changes in insulation thickness of walls and roofs during building envelope retrofit were optimized based on the primary energy consumption. It is concluded that the variants of PESR (primary energy saving ratio) versus various insulation thickness of walls and roofs based on Jie et al [23]' study.The construction material was in situ, protected concrete, and the external walls were coated brick walls. The windows were double-glazed glass with aluminum frames.…”

Section: Building Insulationmentioning

confidence: 93%

Novel Techniques for Saving Energy Consumption in Air Conditioning Systems

Berry¹

2019

Proceedings of the 5th World Congress on Mechanical, Chemical, and Material Engineering

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Electrical energy consumption in air conditioning systems (ACS) is a sizeable portion of global electrical energy consumption. This means that it has a considerable share of global warming, which needs to be reduced. This article reviews the causes of excessive ACS energy consumption as well as modern trends in management and control of ACS energy consumption. Energy demand and consumption are high for air conditioning, especially in humid and hot weather. Opportunities for saving energy in cooling and heating systems depend mainly on reducing loads. Reducing the thermal loads can be achieved through new techniques Brief informational review of some of the most used ACS specifies cooling and heating loads and new techniques to reduce its energy consumption. Performance of ACSs for various types is mostly identified as the ratio of the active or beneficial output to the requisite total input of the equipment. The target to decrease the energy consumption of electrical systems is an essential step to define the components and equipment that are used to build the system and select the types that are considered as an energy saver. After ending this essential step we can concentrate on selecting and improving the overall system performance. Hence, this article provides review information of the most ACSs and specify its new techniques of energy consumption reduction.

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“…Their studies proved that greenhouse gas emissions associated with the ITEWB were reduced at the economic insulation thickness compared to that at the zero thickness. The necessity of considering the integrated impacts in the optimization criteria is proved by [14,32,33]. These findings showed the significant impact of criteria on the OTWRB.…”

Section: Introductionmentioning

confidence: 91%

Optimization of Insulation Thickness of External Walls of Residential Buildings in Hot Summer and Cold Winter Zone of China

2020

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It is important to reduce primary energy consumption and greenhouse gas emissions associated with residential buildings in the hot summer and cold winter (HSCW) zone of China. Changing the insulation thickness of the external walls of residential buildings (ITEWB) is regarded as an effective way to manage such problems within a budget. This paper aims at developing an innovative way to select the optimal insulation thickness of external walls for residential buildings (OTWRB) in the HSCW zone of China, considering economic, energy and greenhouse gas emissions issues associated with the ITEWB. Four different cities and two different operation modes of the air conditioners (continuous and intermittent) are considered in this study. To explain the selection process, typical hypothetical buildings are simulated in Wuhan, Changsha, Hangzhou and Chengdu. Expanded polystyrene is chosen as the material of the insulation layer while split air conditioners are selected as the equipment for space heating and cooling. Integrated Environmental Solutions-Virtual Environment is used for the dynamic operational energy consumption of buildings. Life cycle cost method is adopted to calculate the economic impact of ITEWB on building performance. The Chinese life cycle database is used to quantize the impacts of ITEWB on building performance in the aspect of energy and greenhouse gas emissions based on the life cycle theory. The most appreciated insulation thickness is chosen from the thickness range of 30 mm to 150 mm. We find that for continuous operation mode of air conditioners in Wuhan, the optimal economic insulation thickness is 70 mm, whereas when considering only energy and environmental aspects, the OTWRB is 150 mm. These are all larger than the current insulation thickness which is 30 mm. When the weighting efficiencies of the economy, energy, and greenhouse gas emissions are different, the OTWRB varies from 70 mm to 150 mm for continuous operation mode. The different cities have little influence on the OTWRB while the different operation modes of air conditioners have some influence on the OTWRB.

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Optimizing the insulation thickness of walls and roofs of existing buildings based on primary energy consumption, global cost and pollutant emissions

Cited by 81 publications

References 49 publications

Safety Assessment of Casting Workshop by Cloud Model and Cause and Effect–LOPA to Protect Employee Health

Safety Assessment of Casting Workshop by Cloud Model and Cause and Effect–LOPA to Protect Employee Health

Novel Techniques for Saving Energy Consumption in Air Conditioning Systems

Optimization of Insulation Thickness of External Walls of Residential Buildings in Hot Summer and Cold Winter Zone of China

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