Heat Gains in Buildings ‐ Limit Conditions for Calculating Energy Consumption

Monstvilas, Edmundas; Banionis, Karolis; Stankevičius, Vytautas; Karbauskaitė, Jūratė; Bliūdžius, Raimondas

doi:10.3846/jcem.2010.50

Cited by 9 publications

(6 citation statements)

References 19 publications

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“…Since the internal environment of buildings is actively adjusted through HVAC system (including heating system and cooling system), the energy saving of green buildings is represented by the energy saving of the HVAC system. Different calculation methods of the annual energy consumption for buildings have been provided by some standards and scholars, such as Monstvilas et al [44], Zhang et al [45], and Jin et al [46]. Common BIM technology is often combined with some standards to calculate the energy consumption of buildings.…”

Section: Energy-saving Analysis Model For Green Building Envelopementioning

confidence: 99%

BIM-VE-Based Optimization of Green Building Envelope from the Perspective of both Energy Saving and Life Cycle Cost

et al. 2020

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In the context of the increasingly severe energy crisis and global warming, green buildings and their energy-saving issues are being paid more attention in the world. Since envelope optimization can significantly reduce the energy consumption of green buildings, value engineering (VE) technology and building information modeling (BIM) technology are used to optimize the envelope of green buildings, which takes into account both energy saving and life cycle cost. The theoretical framework of optimization for green building envelope based on BIM-VE is proposed, including a BIM model for architecture, a life cycle cost analysis model, energy-saving analysis model, and a value analysis model. In the life-cycle cost model, a mathematical formula for the life-cycle cost is established, and BIM technology is used to generate a bill of quantity. In the energy-saving analysis model, a mathematical formula for energy saving is established, and BIM technology is used for the building energy simulation. In the scheme decision-making sub-model, VE technology integrating life cycle cost with energy saving is used to assess the envelope schemes and select the optimal one. A prefabricated project case is used to simulate and test the established methodology. The important results show that the 16 envelope schemes make the 16 corresponding designed buildings meet the green building evaluation standards, and the optimal envelope scheme is the “energy-saving and anti-theft door + exterior window 2+ floor 1+ exterior wall 1 + inner shear wall + inner partition wall 2 + planted roof” with the value 10.80 × 10−2 MW·h/ten thousand yuan. A significant finding is that the value generally rises with the increase of energy-saving rate while the life cycle cost is irregular with the increase of energy-saving rate. Compared with previous efforts in the literature, this study introduces VE technology into architectural design to further expand the current boundary of building energy-saving theory. The findings and suggestions will provide a valuable reference and guidance for the architectural design industry to optimize the envelope of green buildings from the perspective of both energy saving and life cycle cost.

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Section: Energy-saving Analysis Model For Green Building Envelopementioning

confidence: 99%

BIM-VE-Based Optimization of Green Building Envelope from the Perspective of both Energy Saving and Life Cycle Cost

et al. 2020

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“…Analysing the literature shows that in most cases, an average value is taken for internal heat gains either dependent or independent on the type of building [4,[18][19][20][21][22]. A more detailed approach is taken by [23,24], who analysed the drivers of internal heat gains by distinguishing between the heat dissipation of residents and end-uses.…”

Section: Modelling Dynamic Internal Heat Gain Developmentmentioning

confidence: 99%

“….is the internal heat gain from the presence of residents, is the length of the heating period, is the number of residents per dwelling, d is the average heat dissipation of 70 W per capita of a resident [22,29,31] and h is the average daily period spent by a resident in a dwelling, which is assumed to be 12 hours here (Fig. 2) [29].…”

Section: Modelling Dynamic Internal Heat Gain Developmentmentioning

confidence: 99%

Are Internal Heat Gains Underestimated in Thermal Performance Evaluation of Buildings?

2014

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Improving the energy performance of buildings can contribute substantially to reducing energy demand. To evaluate the useful energy demand for space heating purposes from an energy economics perspective norm-based bottom-up models are applied that capture the energy-related characteristics of buildings. As electricity demand per household attributed to appliances and lighting has increased substantially in the EU27 during the last two decades (+50 %), the question arises whether the static norm-based approach is underestimating the contribution of internal heat gains to covering useful energy demand. To analyze the impact of dynamic internal heat gains in the residential sector, a bottom-up vintage model is applied that covers the EU27 building stock with a country-specific typology. This means the internal heat gains are time-dependent and heat dissipation is distinguished by appliances, lighting and residents. The analysis consists of two explorative scenarios for the residential building stock of EU27 until 2050. A reference scenario represents the static norm-based modelling of internal heat gains while the second scenario considers their dynamic development. The study reveals that the norm-based approach underestimates the contribution of internal heat gains to covering thermal heat demand. Comparing the countries throughout the EU27 climate zones indicates that on average the static and the dynamic share of internal heat gains differ in a range from 20-70 % by 2050. Especially in the case of nearly Zero-Energy Buildings (nZEB), e.g. with 30 kWh/m²*a useful energy demand, the internal heat gains are about 10-15 % higher using the dynamic approach compared to the norm-based approach.

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“…However, no calculations concerning heat gain from lighting systems using different sources of light have been taken into consideration. Internal heat gains from lighting affect the final energy consumption for heating public facilities as well as residential buildings [4,5].…”

Section: Introductionmentioning

confidence: 99%

Internal heat gain from different light sources in the building lighting systems

Suszanowicz

2017

E3S Web Conf.

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Abstract. EU directives and the Construction Law have for some time required investors to report the energy consumption of buildings, and this has indeed caused low energy consumption buildings to proliferate. Of particular interest, internal heat gains from installed lighting affect the final energy consumption for heating of both public and residential buildings. This article presents the results of analyses of the electricity consumption and the luminous flux and the heat flux emitted by different types of light sources used in buildings. Incandescent light, halogen, compact fluorescent bulbs, and LED bulbs from various manufacturers were individually placed in a closed and isolated chamber, and the parameters for their functioning under identical conditions were recorded. The heat flux emitted by 1 W nominal power of each light source was determined. Based on the study results, the empirical coefficients of heat emission and energy efficiency ratios for different types of lighting sources (dependent lamp power and the light output) were designated. In the heat balance of the building, the designated rates allow for precise determination of the internal heat gains coming from lighting systems using various light sources and also enable optimization of lighting systems of buildings that are used in different ways.

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Heat Gains in Buildings ‐ Limit Conditions for Calculating Energy Consumption

Cited by 9 publications

References 19 publications

BIM-VE-Based Optimization of Green Building Envelope from the Perspective of both Energy Saving and Life Cycle Cost

BIM-VE-Based Optimization of Green Building Envelope from the Perspective of both Energy Saving and Life Cycle Cost

Are Internal Heat Gains Underestimated in Thermal Performance Evaluation of Buildings?

Internal heat gain from different light sources in the building lighting systems

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