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Dr. Alessandra De Angelis
DPIA–Polytechnic Department of Engineering and Architecture, University of Udine, 33100 Udine, Italy

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0 Indoor Air Quality
0 indoor comfort
0 Healthy buildings
0 Building energy performance simulation
0 Building energy refurbishment

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Journal article
Published: 30 March 2021 in Journal of Building Engineering
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Wood decay risk assessment of building envelopes is commonly performed by engineers, architects and practitioners using results of Heat and Moisture Transfer (HMT) simulations and damage models. The commonly accepted HMT models use bijective sorption functions, accepting that materials reach hygrothermal equilibrium with the humidity contained in the air of the material’s pores and of the environment at a single MC. On the other hand, due to moisture hysteresis, equilibrium can be reached at different MCs for the same air condition, depending on previous equilibrium states. The aim of this work is to quantify the effect of considering hysteresis in HMT simulations and to evaluate its propagation in the risk assessment procedure for the case of wood decay. The software MATCH is used, implementation of an HMT model with hysteresis. Three timber walls are simulated in seven locations (Bolzano, Copenhagen, Hong Kong, Ottawa, Shanghai, Udine, and Vienna), first with hysteresis and then with simplified bijective sorption functions (adsorption, desorption, and mean sorption curve). MC and temperature time series are used to perform wood decay risk assessment with two damage models. The results show that the influence of hysteresis can be relevant, and that the choice of the sorption curve used in the simulations should be discussed. For the case of a CLT wall in Shanghai, simulated using the adsorption curve, a mean difference of 1.6% MC is found from the hysteresis case. This resulted in a difference of 0.7 decay rating in 10 years and 6% mass loss in 30 years.

ACS Style

Michele Libralato; Alessandra De Angelis; Onorio Saro; Menghao Qin; Carsten Rode. Effects of considering moisture hysteresis on wood decay risk simulations of building envelopes. Journal of Building Engineering 2021, 42, 102444 .

AMA Style

Michele Libralato, Alessandra De Angelis, Onorio Saro, Menghao Qin, Carsten Rode. Effects of considering moisture hysteresis on wood decay risk simulations of building envelopes. Journal of Building Engineering. 2021; 42 ():102444.

Chicago/Turabian Style

Michele Libralato; Alessandra De Angelis; Onorio Saro; Menghao Qin; Carsten Rode. 2021. "Effects of considering moisture hysteresis on wood decay risk simulations of building envelopes." Journal of Building Engineering 42, no. : 102444.

Journal article
Published: 23 April 2020 in Energies
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Heat and moisture (HM) transfer simulations of building envelopes and whole building energy simulations require adequate weather files. The common approach is to use weather data of reference years constructed from meteorological records. The weather record affects the capability of representing the real weather of the resulting reference years. In this paper the problem of the influence of the length of the records on the representativeness of the reference years is addressed and its effects are evaluated also for the applicative case of the moisture accumulation risk analysis with the Glaser Method and with DELPHIN 6, confirming that records shorter than 10 years could lead to less representative reference years. On the other hand, it is shown that reference years obtained from longer periods are not representative of the most recent years, which present higher dry-bulb air temperatures due to a short-term climate change effect observed in all the considered weather records. An alternative representative year (Moisture Representative Year) to be used in building energy simulations with a strong dependence on moisture is presented.

ACS Style

Michele Libralato; Giovanni Murano; Alessandra De Angelis; Onorio Saro; Vincenzo Corrado. Influence of the Meteorological Record Length on the Generation of Representative Weather Files. Energies 2020, 13, 2103 .

AMA Style

Michele Libralato, Giovanni Murano, Alessandra De Angelis, Onorio Saro, Vincenzo Corrado. Influence of the Meteorological Record Length on the Generation of Representative Weather Files. Energies. 2020; 13 (8):2103.

Chicago/Turabian Style

Michele Libralato; Giovanni Murano; Alessandra De Angelis; Onorio Saro; Vincenzo Corrado. 2020. "Influence of the Meteorological Record Length on the Generation of Representative Weather Files." Energies 13, no. 8: 2103.

Journal article
Published: 23 September 2019 in Energies
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Modern electric and electronic equipment in energy-intensive industries, including electric steelmaking plants, are often housed in outdoor cabins. In a similar manner as data centres, such installations must be air conditioned to remove excess heat and to avoid damage to electric components. Cooling systems generally display a water–energy nexus behaviour, mainly depending on associated heat dissipation systems. Hence, it is desirable to identify configurations achieving both water and energy savings for such installations. This paper compares two alternative energy-saving configurations for air conditioning electric cabins at steelmaking sites—that is, an absorption cooling based system exploiting industrial waste heat, and an airside free-cooling-based system—against the traditional configuration. All systems were combined with either dry coolers or cooling towers for heat dissipation. We calculated water and carbon footprint indicators, primary energy demand and economic indicators by building a TRNSYS simulation model of the systems and applying it to 16 worldwide ASHRAE climate zones. In nearly all conditions, waste-heat recovery-based solutions were found to outperform both the baseline and the proposed free-cooling solution regarding energy demand and carbon footprint. When cooling towers were used, free cooling was a better option in terms water footprint in cold climates.

ACS Style

Maurizio Santin; Damiana Chinese; Onorio Saro; Alessandra De Angelis; Alberto Zugliano. Carbon and Water Footprint of Energy Saving Options for the Air Conditioning of Electric Cabins at Industrial Sites. Energies 2019, 12, 3627 .

AMA Style

Maurizio Santin, Damiana Chinese, Onorio Saro, Alessandra De Angelis, Alberto Zugliano. Carbon and Water Footprint of Energy Saving Options for the Air Conditioning of Electric Cabins at Industrial Sites. Energies. 2019; 12 (19):3627.

Chicago/Turabian Style

Maurizio Santin; Damiana Chinese; Onorio Saro; Alessandra De Angelis; Alberto Zugliano. 2019. "Carbon and Water Footprint of Energy Saving Options for the Air Conditioning of Electric Cabins at Industrial Sites." Energies 12, no. 19: 3627.

Articles
Published: 13 June 2019 in Journal of Building Performance Simulation
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The purpose of this article is to present and validate a computationally efficient numerical approach for the calculation of the ground-coupled heat transfer in buildings with periodic boundary conditions. When the boundary conditions of the heat transfer problem are described by periodic functions, it is possible to consider the transient state problem as a quasi-stationary problem with considerable savings in terms of computational time. The method is presented in detail from a mathematical point of view, together with a validation for two simple cases of slab-on-grade thermal losses, four comparisons with the ISO 13370:2007 procedure, a case with a complex shape and an evaluation of the computational efficiency.

ACS Style

M. Libralato; A. De Angelis; O. Saro. Evaluation of the ground-coupled quasi-stationary heat transfer in buildings by means of an accurate and computationally efficient numerical approach and comparison with the ISO 13370 procedure. Journal of Building Performance Simulation 2019, 12, 719 -727.

AMA Style

M. Libralato, A. De Angelis, O. Saro. Evaluation of the ground-coupled quasi-stationary heat transfer in buildings by means of an accurate and computationally efficient numerical approach and comparison with the ISO 13370 procedure. Journal of Building Performance Simulation. 2019; 12 (5):719-727.

Chicago/Turabian Style

M. Libralato; A. De Angelis; O. Saro. 2019. "Evaluation of the ground-coupled quasi-stationary heat transfer in buildings by means of an accurate and computationally efficient numerical approach and comparison with the ISO 13370 procedure." Journal of Building Performance Simulation 12, no. 5: 719-727.