A multi-objective decision model for the improvement of energy efficiency in buildings

Diakaki, Christina; Grigoroudis, Evangelos; Kabelis, Nikos; Κολοκότσα, Δ.; Kalaitzakis, K.; Stavrakakis, G.

doi:10.1016/j.energy.2010.05.012

Cited by 209 publications

(119 citation statements)

References 18 publications

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“…Monetary statistics such as interest rate, inflation rate are obtained from Central Bank of the Republic of Turkey website. 5 Statistics on price growth on fuel and electricity is retrieved from Energy Market Regulatory Authority. 6 NPV analysis is conducted according to: (1) Change in present value of investment in years due to inflation, interest, and adapted interest rate, as 0.065, 0.144, and 0.074, respectively.…”

Section: Investment/payback Analysis Of Ecmsmentioning

confidence: 99%

“…Necessity to reduce fossil fuel consumption and CO 2 emissions led energy-efficient improvements of existing buildings and regulations for new building designs. These efforts developed into research areas such as monitoring and assessment of energy performance of existing buildings, further into retrofit of existing buildings due to implementation of possible energy conservation measures [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Optimization of an envelope retrofit strategy for an existing office building

Gucyeter

Günaydın

2012

Energy and Buildings

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a b s t r a c tEnergy-efficient retrofits include improvement of building envelope via insulation, employment of building integrated renewable energy technologies, and climate control strategies. Building envelope improvements with insulation is a common approach, yet decision-making plays an important role in determining the most appropriate envelope retrofit strategy. In this study, main objective is to evaluate and optimize envelope retrofit strategies through a calibrated simulation approach. Based on an energy performance audit and monitoring, an existing building is evaluated on performance levels and improvement potentials with basic energy conservation measures (ECMs). The existing building is monitored for a full year and monitoring data is used in calibrating the simulation model. In order to obtain a better-performing building envelope three retrofit strategies including several ECMs are proposed. Retrofit strategies are simulated through calibrated base-case model, and results are evaluated according to changes in indoor environmental parameters and annual energy consumption measures. The analysis of results indicated that pre-assessed strategies yield close results. Therefore, a more comprehensive evaluation based on different decisive criteria is used in optimization of the final retrofit strategy, with the intention to evaluate the effect of individual ECMs on annual end-use energy consumption and investment.

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Section: Investment/payback Analysis Of Ecmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of an envelope retrofit strategy for an existing office building

Gucyeter

Günaydın

2012

Energy and Buildings

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“…Thermal storage is most effective when interacting with intermittent heat sources or in conditions of fluctuating temperature, as the amplitude of temperature oscillation is a prerequisite to the thermal storage performance, especially during summer, when the dissipation of excessive thermal gains is paramount [35][36][37]. In climates with a daily temperature variations greater than 15°C and where the average outside temperature is close to the range of thermal comfort (about 20-25°C), high thermal storage buildings are more likely to maintain summer indoor hygrothermal comfort without HVAC systems, as long as the outside temperatures do not exceed 36°C.…”

Section: Strategies Description 21 Thermal Storagementioning

confidence: 99%

Numerical analysis of passive strategies for energy retrofit of existing buildings in Mediterranean climate: thermal mass and natural ventilation combination

2017

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Abstract. The study investigates the potential of coupling natural ventilation and thermal storage systems to improve hygrothermal comfort and reduce energy consumption during summer season in an existing building in the Mediterranean. It aims at bridging the knowledge gap between designers, researchers and building scientists, fostering a multidisciplinary approach and promoting numerical simulation of the energy performance of buildings within architectural professional practice. The study analyses the interaction between six natural ventilation systems (single sided ventilation through facade openings; cross ventilation through facade openings, inlet wind tower, thermal chimney, evaporative cool tower, earth pipes) and with two thermal storage typology (heavy and medium-light) within four strategic Italian location (Rome, Naples, Messina and Catania). For each interaction we perform a numerical dynamic simulation of indoor comfort, indoor air quality and energy consumption during the summer period, on a reference building model corresponding to the most common Italian typology. Results show that the use of the chosen systems ensures significant reductions of discomfort hours and energy consumption in all configurations. The study also highlights the high efficiency of non invasive systems (single-sided and cross ventilation with automatic control present discomfort hours reduction and energy consumption reduction above 68% for all combinations) and the significant influence of the daily thermal range value on the performance of systems without air pre-treatment.

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“…The approbation of theoretical methods for calculating the thermal characteristics of prefabricated buildings were performed. The results of thermal performance of prefabricated building walls were obtained [7]. Scientists [8] analyzed the thermal field forming of the exterior wall of frontal concrete panel with mounting hooks.…”

mentioning

confidence: 99%

Thermophysical aspects of reconstruction of cold roof spaces

et al. 2017

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Abstract.The results of theoretical studies of thermal modernization of cold roof floor. The designs of overlap of long-life roofs of public buildings were considered. Overlap of these buildings are made by wooden or concrete beams and made of concrete slabs with upward edges. The problems of thermal modernization of these designs are consideration of the impact of heat-conducting inclusions on the resistance to heat. The heat-conducting inclusions of constructions are beams and vertical edges of the slabs. The results of calculations of the temperature fields were used for the analysis. The research was carried for the two temperature zones which Ukraine's territory is divided into. The analysis of thermal protection level of structures overlap was made. The magnitude of the impact of heat-conducting inclusions on resistance to heat after thermal modernization of cold roof floor was observed. The analysis showed that the thermal protection properties of structures less than standard, therefore the insulation of areas with heat-conducting inclusions is required. The options of insulation of these areas were considered. The optimal insulation options with the least amount of additional insulation over the heat conductive areas were selected.One of the main tasks of external walling designing is to provide a normalized level of thermal and moisture conditions. However, when determining the thickness of the heatinsulation material of the walling the availability of the heat conductive inclusions with the thermal protection level smaller than in areas without it is ignored. In the roof floor buildings with long-life heat-conducting inclusions related to the vertical edges of concrete slabs, wooden beams and reinforced concrete. Ignoring of the properties of these areas leads to higher overall heat loss through external building walling. In addition to high heat in these areas there are such negative phenomena as lowering the temperature of the inner surface and increasing the amplitude of temperature variations on this surface. Increasing of the thermal-resisting properties is possible by additional insulation of heat conductive areas inclusions.There are works of various authors dedicated to the issue of increasing the thermalresisting properties of heat conductive areas inclusions of the external walling [1,2]. Such as [3,4] performed a series of tests of thermal external wall panels of residential and civil buildings. During the study the impact of "cold bridges" on the thermal quality of external

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A multi-objective decision model for the improvement of energy efficiency in buildings

Cited by 209 publications

References 18 publications

Optimization of an envelope retrofit strategy for an existing office building

Optimization of an envelope retrofit strategy for an existing office building

Numerical analysis of passive strategies for energy retrofit of existing buildings in Mediterranean climate: thermal mass and natural ventilation combination

Thermophysical aspects of reconstruction of cold roof spaces

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