Multi-objective optimization analysis for high efficiency external walls of zero energy buildings (ZEB) in the Mediterranean climate

Baglivo, Cristina; Congedo, Paolo Maria; Fazio, Andrea; Laforgia, Domenico

doi:10.1016/j.enbuild.2014.08.043

Cited by 66 publications

(38 citation statements)

References 13 publications

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“…Many studies have analyzed several types of high energetic efficiency external walls for ZEBs; in particular in the Mediterranean climate, Baglivo et al [2,3] carried out an analysis through the combination of various materials, in terms of steady thermal transmittance, periodic thermal transmittance, decrement factor, time shift, areal heat capacity, thermal admittance, surface mass, thickness.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamic Modeling of Horizontal Air-Ground Heat Exchangers (HAGHE) for HVAC Systems

et al. 2014

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Abstract:In order to satisfy the requirements of Directive 2010/31/EU for Zero Energy Buildings (ZEB), innovative solutions were investigated for building HVAC systems. Horizontal air-ground heat exchangers (HAGHE) offer a significant contribution in reducing energy consumption for ventilation, using the thermal energy stored underground, in order to pre-heat or pre-cool the ventilation air, in winter and summer, respectively. This is particularly interesting in applications for industrial, commercial and education buildings where keeping the indoor air quality under control is extremely important. Experimental measurements show that, throughout the year, the outside air temperature fluctuations are mitigated at sufficient ground depth (about 3 m) because of the high thermal inertia of the soil, the ground temperature is relatively constant and instead higher than that of the outside air in winter and lower in summer. The study aims to numerically investigate the behavior of HAGHE by varying the air flow rate and soil conductivity in unsteady conditions by using annual weather data of South-East Italy. The analysis shows that, in warm climates, the HAGHE brings a real advantage for only a few hours daily in winter, while it shows significant benefits in the summer for the cooling of ventilation air up to several temperature degrees, already by a short pipe. OPEN ACCESSEnergies 2014, 7 8466

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Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamic Modeling of Horizontal Air-Ground Heat Exchangers (HAGHE) for HVAC Systems

et al. 2014

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“…Indeed, analyzing the combinations of various materials is considered an effective method for designing external walls characterized by high energy performance for ZEB [25], considering that ZEB aims at reducing the energy demand through efficient technology measures [26]. In addition, the design of new building technologies upcycling municipal waste materials involves an additional reduction of environmental impacts [16], which decreases the waste amount to be treated thanks to local reuse.…”

Section: Methodsmentioning

confidence: 99%

Reuse and Upcycling of Municipal Waste for ZEB Envelope Design in European Urban Areas

et al. 2016

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Abstract:Building energy efficiency and urban waste management are two focal issues for improving environmental status and reducing greenhouse gas emissions. The main aim of this paper is to compare economic costs of new building envelope structures designed by authors reusing and upcycling municipal waste in order to decrease energy demand from the building sector and, at the same time, improve eco-friendly waste management at the local scale. The reuse of waste for building envelope structures is one of the main principles of the Earthship buildings model, based on the use of passive solar principles in autonomous earth-sheltered homes. This Earthship principle has been analyzed in order to optimize buildings' energy performance and reuse municipal waste for new building envelope structures in urban areas. Indeed, the elaborated structures have been designed for urban contexts, with the aim of reuse waste coming from surrounding landfills. The methods include an analysis of thermal performance of urban waste for designing new building envelope structures realized by assembling waste and isolating materials not foreseen in Earthship buildings. The reused materials are: cardboard tubes, automobile tires, wood pallets, and plastic and glass bottles. Finally, comparing economic costs of these new building envelope structures, the obtained results highlight their economic feasibility compared to a traditional structure with similar thermal transmittance.

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“…The study highlights the importance to evaluate how the dynamic parameters are influenced by the variations of the external and internal loads, changing the operating mode of the technological system and the shortwave radiative heat fluxes. Several studies [23][24][25] have been carried out to define the characteristics of a high energy performant external envelope for a warm climate, highlighting the importance of heat storage capacity. It has been possible to note that external walls with high values of internal areal heat capacity can reduce significantly and delay temperature peaks inside the building.…”

Section: Building Retrofit and Technology Innovationmentioning

confidence: 99%

Economic and Thermal Evaluation of Different Uses of an Existing Structure in a Warm Climate

et al. 2017

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Accounting for nearly 40% of final energy consumption, buildings are central to European energy policy. The Directive on Energy Performance of Buildings establishes a benchmarking system known as cost-optimality to set minimum energy performance requirements in new and existing buildings. This paper applies the cost-optimal methodology to an existing structure located in the Mediterranean area (Southern Italy). The building is composed of two units that have been considered for different uses: hotel and multi-residential. Several energy efficiency and renewable measures have been implemented both individually and as part of packages of measures. The cost-optimal solution has been identified as able to optimize energy consumption and costs from financial and macroeconomic perspectives. The first reference building (hotel use) shows a maximum reduction of primary energy and CO 2 emission of about 42%, falling within the CasaClima energy class D, while the second reference building (residential use) achieves a value of 88% for primary energy and 85% for CO 2 emissions, falling into class B. Thermal dispersions through the envelope can be limited using a suitable combination of insulating materials while a variety of technical variants are selected, such as VRF (variant refrigerant flow) systems, heat pumps with fan coils associated with controlled mechanical ventilation, solar thermal and photovoltaic. This paper illustrates the development of energy retrofit projects, in order to reach a balance between efficiency measures and costs for a building having two different uses, providing guidance to similar case studies related to a warm climate.Keywords: cost-optimal methodology; retrofit; energy simulations; economic assessment; energy efficiency measures HighlightsEvaluation of cost-optimal solutions for existing building retrofit. Analysis of two different intended building uses for the same structure.Comparison between hotel and residential use for cost-optimal assessment. Establishment of combination of variants for energy efficiency improvement. Assessment of global costs for the identification of the cost-optimal configuration.

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Multi-objective optimization analysis for high efficiency external walls of zero energy buildings (ZEB) in the Mediterranean climate

Cited by 66 publications

References 13 publications

Computational Fluid Dynamic Modeling of Horizontal Air-Ground Heat Exchangers (HAGHE) for HVAC Systems

Computational Fluid Dynamic Modeling of Horizontal Air-Ground Heat Exchangers (HAGHE) for HVAC Systems

Reuse and Upcycling of Municipal Waste for ZEB Envelope Design in European Urban Areas

Economic and Thermal Evaluation of Different Uses of an Existing Structure in a Warm Climate

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