Optimal Thermal Insulation Thicknesses of External Walls Based on Economic and Ecological Heating Cost

Dylewski, Robert

doi:10.3390/en12183415

Cited by 22 publications

(16 citation statements)

References 11 publications

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“…The temperature of the outer surface of the outer wall was determined from the balance sheet ( Figure 8): Taking into account the Equations (10)- (12) and the heat conduction equation under the surface of the partition (24), it can be concluded that:…”

Section: Heat Losses Through the External Wall-case Studymentioning

confidence: 99%

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Introduction to the Dynamics of Heat Transfer in Buildings

Babiarz

Szymanski²

2020

Energies

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Changing climatic conditions cause the variability of the parameters of the building’s surroundings, which in turn causes both the gains and losses of heat to change over time. There is variability in both daily and annual cycles. Meeting the requirements of thermal comfort in rooms requires maintaining the required parameters, including constant temperature. Heat gains and losses must be balanced, and this balance is ensured through appropriate heating systems. At the same time, the above means that the demand for heating buildings is not constant but depends on external weather conditions and the energy efficiency of the building. This, in turn, affects the thermal inertia, causing changes in the partition temperature to occur slower than the changes in air temperature. Therefore, the amplitude of the heating power changes is not proportional to the amplitude of the outside air temperature change. The paper presents an example of the analysis of thermal dynamics in buildings. Various aspects of heat transfer in the building were investigated taking into account the transient conditions. The variability of temperature over time at different depths of the partition was analysed, showing the results graphically. The periodic variability of the outside air temperature and the intensity of solar radiation were described by the Fourier series. Moreover, the article shows the influence of the thermal insulation thickness of the external wall on the annual amplitude of temperature changes and on the duration of the heating season, which is important from the point of view of optimization.

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Section: Heat Losses Through the External Wall-case Studymentioning

confidence: 99%

“…In the work [23], it has been shown that the convective heat transfer coefficient value strongly depends on the wind velocity. The influence of the thermal insulation thicknesses of external walls on heating cost from the ecological and economic assessment is analyzed in [24].…”

Section: Introductionmentioning

confidence: 99%

Introduction to the Dynamics of Heat Transfer in Buildings

Babiarz

Szymanski²

2020

Energies

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“…However, the main target group of materials are innovative materials for further development rather than mass-produced insulation. The eco-friendly thermal insulation materials are much more expensive in comparison to the traditional thermal insulation materials almost in all cases [26] and the price is less crucial than the environmental effect. This study focuses on the fibers from the hemp used for soil regeneration before it ripens.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Thermal Parameters of Hemp Fiber Insulation

et al. 2020

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Nowadays, sustainable construction is a key factor for reaching net-zero emissions of carbon dioxide all over the world. This goal is impossible to achieve by merely reducing the energy consumption of end-users. A more holistic approach should be taken, adopting sustainable industrial practices that use environmentally friendly materials on a large scale. This paper presents the analysis of the hydrothermal properties of hemp thermal insulation plates. We carried out extensive measurements and the analysis of the thermal conductivity coefficient, drying-out dynamics, and water absorption. The study was performed with experimental insulation samples based on the fiber obtained from hemp stems, prepared using different adhesive powders. The dimensions of the analyzed samples were 300 × 300 mm. The proposed samples are not yet available in mass production. Hemp does not flower in the Baltic region and was traditionally used for soil regeneration. Thus, using this raw material increases the added value of agricultural residues. Three series of hemp fiber samples with different substances and pressing modes were evaluated in the study. Each set of samples consisted of four plates with varying thicknesses and two different densities: 200 kg/m3 and 300 kg/m3. All samples exhibited a significant increase in moisture absorption and a strong correlation with the increase in thermal conductivity. The average thermal conductivity of the test samples ranged from 0.0544 to 0.0594 W/mK. The impact of the adhesive powder on the thermal conductivity was found to be extremely small. However, the values obtained were much higher than those for traditional thermal insulation materials, allowing to utilize the local agriculture residues and providing material for the construction of eco-friendly buildings.

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“…Dylewski [17] studied the environmental impact of diverse thermal insulation materials for exterior walls in Poland, considering alternative heat sources, in order to find the optimal insulation thickness considering both economic and ecological net present value of insulation (as an investment). Results showed that significantly higher thicknesses were recommended when considering environmental data as compared to economic data-for instance, 0.46-0.52 m of expanded polystyrene (EPS) insulation considering brick walls and a heat pump system.…”

Section: Introductionmentioning

confidence: 99%

Life-Cycle Assessment of Alternative Envelope Construction for a New House in South-Western Europe: Embodied and Operational Magnitude

Freire

Fernández

2020

Energies

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The building envelope is critical to reducing operational energy in residential buildings. Under moderate climates, as in South-Western Europe (Portugal), thermal operational energy may be substantially reduced with an adequate building envelope selection at the design stage; therefore, it is crucial to assess the trade-offs between operational and embodied impacts. In this work, the environmental influence of building envelope construction with varying thermal performance were assessed for a South-Western European house under two operational patterns using life-cycle assessment (LCA) methodology. Five insulation thickness levels (0–12 cm), four total ventilation levels (0.3–1.2 ac/h), three exterior wall alternatives (double brick, concrete, and wood walls), and six insulation materials were studied. Insulation thickness tippingpoints were identified for alternative operational patterns and wall envelopes, considering six environmental impact categories. Life-cycle results show that, under a South-Western European climate, the embodied impacts represent twice the operational impact of a new Portuguese house. Insulation played an important role. However, increasing it beyond the tipping-point is counterproductive. Lowering ventilation levels and adopting wood walls reduced the house life-cycle impacts. Cork was the insulation material with the lowest impact. Thus, under a moderate climate, priority should be given to using LCA to select envelope solutions.

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Optimal Thermal Insulation Thicknesses of External Walls Based on Economic and Ecological Heating Cost

Cited by 22 publications

References 11 publications

Introduction to the Dynamics of Heat Transfer in Buildings

Introduction to the Dynamics of Heat Transfer in Buildings

Analysis of Thermal Parameters of Hemp Fiber Insulation

Life-Cycle Assessment of Alternative Envelope Construction for a New House in South-Western Europe: Embodied and Operational Magnitude

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