scholarly journals Building energy analysis of an industrial hall based on dynamic simulations

2018 ◽  
Vol 9 (2) ◽  
pp. 145-151
Author(s):  
D. Szagri ◽  
B. Nagy
Keyword(s):  
Energy Consumption ◽  
Reinforced Concrete ◽  
Energy Demand ◽  
Industrial Building ◽  
Dynamic Simulations ◽  
Steel Fibre Reinforced Concrete ◽  
Roof Structure ◽  
Building Simulations ◽  
Coupled Heat And Moisture ◽  
Heating Energy Demand

The aim of the paper is primarily to evaluate the heating energy demand of an industrial hall. In the study, we have made multidimensional dynamic whole building simulations for describing coupled heat and moisture behaviour and energy consumption of the building with different internal loads and compared to the calculated energy consumption of the building according to the Hungarian and Austrian regulations. The walls and roof structure of the industrial building were made with insulated panel systems, the plinth wall was built with monolithic reinforced concrete with 12 cm of XPS insulation. The floor is made of steel fibre reinforced concrete, where 10 cm XPS perimeter insulation was applied. After the calculations, we insulated the floor on the whole surface with 10 cm XPS and investigated the modified structure’s heating energy demand too. In the paper, we analyse the energy consumption of the original and modified industrial building according to the monthly and seasonal calculations and the whole building dynamic simulations and evaluated the differences. Furthermore, we assessed the effect of internal loads, thermal bridges on the simulations.

scholarly journals Evaluating the Effect of Different Base Temperatures to Calculate Degree-Days

2020 ◽  
Vol 24 (2) ◽  
pp. 364-372
Author(s):  
Xabat Oregi ◽  
Carlos Jimenez-Bescos
Keyword(s):  
Energy Consumption ◽  
Energy Demand ◽  
The Other ◽  
Base Temperature ◽  
Main Aspect ◽  
Degree Days ◽  
Northern Spain ◽  
Building Simulations ◽  
San Sebastian ◽  
Thermostat Temperature

AbstractDegree-days are used as a forecasting tool to predict energy demand and for normalizing energy consumption to be able to compare between different properties across different years. The base temperature is the main aspect to accurately calculate degree-days. The aim of this study was to evaluate the effect of different base temperatures and their impact on the correlation between energy consumption and degree-days. The base temperature was selected as the standard 15 °C for the region, the balance temperature calculated with dynamic building simulations and the thermostat temperature setting as collected by questionnaires. The methodology followed is based on the analysis of 20 properties located in the cities of Bilbao, San Sebastian and Vitoria in northern Spain. The properties are a combination of flats and houses, from different construction periods, tenancies, occupancy and sizes. This study had highlighted the effect and impact of selecting different base temperatures for the calculation of degree-days and the correlation between energy consumption and degree-days. While the use of the balance temperature as base temperature could generate very good correlation, they were not so dissimilar from using the standard 15 °C base temperature to justify the amount of extra work required to generate the balance temperature. The use of the thermostat setting as an indication of the base temperature was not as reliable as the other base temperature methods in generating a good correlation to explain the energy consumption on the 20 properties investigated in this study.

scholarly journals PCSP’s Diagonal Tie Connectors Thermal Bridges Impact on Energy Performance and Operational Cost: Case Study of a High-Rise Residential Building in Estonia

2020 ◽  
Vol 172 ◽  
pp. 08006
Author(s):  
Martin Kiil ◽  
Martin-Sven Käärid ◽  
Paul Klõšeiko ◽  
Karl-Villem Võsa ◽  
Raimo Simson ◽  
...  
Keyword(s):  
Energy Demand ◽  
Residential Building ◽  
Energy Performance ◽  
Relative Increase ◽  
Dynamic Simulations ◽  
Climatic Regions ◽  
High Rise ◽  
Thermal Bridge ◽  
Heating Energy Demand ◽  
Air Circulation

This study analyses the effect of air circulation around diagonal tie connectors in precast sandwich panels on heating energy demand, energy performance value and heating costs of a sample residential building. Dynamic simulations were performed using 4 different climatic boundary conditions: Estonian test reference year, Estonian 48-year weather dataset as well as data from Eastern Germany and Northern Finland. The results show that the effect of the thermal bridge is most noticeable in total room heating energy demand (increase of 10.3%), while the influence on energy performance value was 1.1%. The relative increase of total room heating energy demand was similar (7.0-10.3%) in all studied climatic regions.

scholarly journals Study of the Improvement on Energy Efficiency for a Building in the Mediterranean Area by the Installation of a Green Roof System

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1246 ◽  
Author(s):  
Elisa Peñalvo-López ◽  
Javier Cárcel-Carrasco ◽  
David Alfonso-Solar ◽  
Iván Valencia-Salazar ◽  
Elias Hurtado-Pérez
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Energy Demand ◽  
Simulation Analysis ◽  
Green Roof ◽  
Mediterranean Area ◽  
Substantial Improvement ◽  
Winter Period ◽  
Reduction Of Energy Consumption ◽  
Heating Energy Demand

Rooftop gardens ona building have proved to be a good way to improve its storm water management, but many other benefits can be obtained from the installation of these systems, such as reduction of energy consumption, decrease of the heat stress, abatement on CO2 emissions, etc. In this paper, the effect from the presence of these rooftop gardens on abuilding’s energy consumption has been investigated by experimental campaigns using a green roof ona public building in a Mediterranean location in Spain. The obtained results demonstrate a substantial improvement by the installation of the green roof onthe building’s cooling energy demand for a standard summer day, in the order of 30%, and a reduction, about 15%, in the heating energy demand for a winter day. Thus, given the longer duration of the summer conditions along the year, a noticeable reduction on energy demand could be obtained. Simulation analysis, using commercial software TRNSYS code, previously calibrated using experimental data for typical summer and winter days, allows for the extrapolation to the entire year of these results deducing noticeable improvement in energy efficiency, in the order of 19%, but with an increase of 6% in the peak power during the winter period.

scholarly journals Experimental and Numerical Energy Assessment of a Monolithic Aerogel Glazing Unit for Building Applications

2019 ◽  
Vol 9 (24) ◽  
pp. 5473 ◽  
Author(s):  
Cinzia Buratti ◽  
Elisa Moretti ◽  
Elisa Belloni ◽  
Michele Zinzi
Keyword(s):  
Energy Demand ◽  
Residential Building ◽  
Thermal Characterization ◽  
New Production ◽  
Dynamic Simulations ◽  
Building Envelopes ◽  
Energy Assessment ◽  
Rapid Supercritical Extraction ◽  
Heating Energy Demand

In the last few decades, the attention of researchers has been focused on the characterization of aerogels in order to improve the thermal performance of transparent building envelopes. Granular aerogel is already spread in the market thanks to the easy manufacturing system, whereas the difficulty in producing monoliths without defects, cracks, and inhomogeneity limited the diffusion of monolithic aerogel systems. A new production process for the monolithic panels was developed at Union College (Schenectady, NY, USA); it is a rapid supercritical extraction technique which allows a reduction in production time (only a few hours) and results in less solvent waste. Panes with maximum dimensions of about 100 × 100 mm were fabricated and composed in a unique glazing system, with external dimensions 300 × 300 mm. The thermal characterization of the innovative monolithic aerogel glazing system (simple float glazing 4.7-mm-thick monolithic aerogel pane 15-mm-thick simple float glazing 4.7 mm thick), which was carried out by means of a Small Hot Box apparatus, showed a thermal transmittance value of about 1.1 W/(m2K). Data was used in dynamic simulations of a typical non-residential building. They showed that the new investigated solution allows a valuable reduction with respect to a low-e double glazing system in terms of heating energy demand (about 5–7% for Helsinki, 8–12% for Paris, and 10–15% for Turin), for different window-to-wall ratios.

scholarly journals Energy, Economic, and Environmental Performance of a Single-Family House in Chile Built to Passivhaus Standard

2021 ◽  
Vol 13 (3) ◽  
pp. 1199
Author(s):  
Camilo Bravo-Orlandini ◽  
José M. Gómez-Soberón ◽  
Claudia Valderrama-Ulloa ◽  
Francisco Sanhueza-Durán
Keyword(s):  
Energy Consumption ◽  
Environmental Performance ◽  
Energy Demand ◽  
Energy Use ◽  
Initial Step ◽  
Energy Performance ◽  
Primary Energy ◽  
Single Family ◽  
Passive Strategies ◽  
Heating Energy Demand

The energy consumption of buildings accounts for 22% of total global energy use and 13% of global greenhouse gas emissions. In this context, this study aims to evaluate the energy, economic, and environmental performance of housing in Chile built according to the Passivhaus (PH) standard. The standard was applied to housing in eight representative climate zones with a single-family residence as reference. The analysis incorporated passive strategies, which are considered as pillars of the PH. The energy performance was analyzed using the Passive House Planning Package software (PHPP), version 9.6a. The results showed that when every passive strategy is implemented, the heating energy demand decreases by 93%, while the refrigeration demand is nonexistent. These results were achieved through a 37% increase in the overall initial budget investment, which will be amortized over an 11-year period. In this way, the primary energy consumption is reduced by 32% and, correspondingly, CO2 emissions are reduced by 39%. In modern Chile, it is difficult (but not impossible) to incorporate PH. However, governmental programs and aids could represent an initial step. Therefore, this research will help to identify strategies for incorporating PH in Chile, with the aim of improving the energy performance of housing.

Simulations of the changes o f the heating energy demand and transmission losses of buildings in central European climate: Combination of experiments and simulations

2015 ◽  
Vol 6 (2) ◽  
pp. 129-139 ◽  
Author(s):  
F. Szodrai ◽  
á. Lakatos
Keyword(s):  
Energy Demand ◽  
Mineral Wool ◽  
Building Envelope ◽  
Expanded Polystyrene ◽  
Simulation Software ◽  
Building Performance ◽  
Central European ◽  
Building Simulations ◽  
Combination Of Methods ◽  
Heating Energy Demand

Recently, it has become extremely important to reduce the heating energy demand and the CO2 emission of buildings. This reduction can easily be achieved by insulating the shell of buildings. By thermal insulation not only the heating energy demand can be reduced but also higher thermal efficiency can be reached. Therefore, measurements, calculations and simulations are carried out on the energy efficiency of buildings. Furthermore, the combination of methods is of great importance. Combination of experiments with building simulations solution can make design practices and sizing processes easier in the investigation of building performance. The purpose of this article is to demonstrate how the energy balance of a building can be changed in function of the wet building envelope in the Central European Region. A real and available building (old family house) was tested and it was placed (hypothetically) in three different countries (Austria, Hungary and Slovakia). In this study two types of load-bearing structures (brick and concrete) covered with four different types of insulations (mineral wool, expanded polystyrene, graphite-doped expanded polystyrene, and extruded polystyrene) were tested. The change in the heating energy of the building in three different countries by the function of measured water contents of the thermal insulators was simulated by CASAnova simulation software.

scholarly journals Energetic impact of preheating of fresh air in added convex window

2019 ◽  
Vol 10 (1) ◽  
pp. 79-85
Author(s):  
Attila Kerekes
Keyword(s):  
Energy Demand ◽  
Natural Ventilation ◽  
Buffer Zone ◽  
Demolition Waste ◽  
Dynamic Simulations ◽  
Existing Building ◽  
Experimental Huts ◽  
Passive Solar ◽  
Heating Energy Demand

During the renovation of an existing building keeping the original window and installing an added convex window is beneficial for the reduction of heating energy demand, furthermore this solution is free of the disposal and/or recycling of demolition waste. The energy need for heating can be further reduced, if the natural ventilation of the premise is through the buffer zone of the added convex window. In this case the fresh air is pre-heated in the buffer zone, increasing the utilised passive solar gain of the building. Measurements were carried out on experimental huts for analysis of this impact. Dynamic simulations of the huts have been carried out as well. In this paper the results will be presented, which proves the energetic effect.

Determination of Optimum Insulation Thickness for Different Climatic Zones of Turkey

2009 ◽  
Author(s):  
Nuri Alpay Ku¨rekci ◽  
O¨zden Ag˘ra ◽  
O¨zlem Emanet
Keyword(s):  
Energy Consumption ◽  
Life Cycle Cost ◽  
Energy Demand ◽  
Average Rate ◽  
Fuel Oil ◽  
Industrial Building ◽  
Total Energy Consumption ◽  
Climatic Zones ◽  
Insulation Thickness ◽  
Optimum Insulation Thickness

Turkey has dynamic economic development and rapid population growth. It also has macro-economic and especially, monetary instability. The net effect of these factors is that Turkey’s energy demand has grown rapidly almost every year and is expected to continue growing. Since 1990, energy consumption has increased at an annual average rate of 4.3%. The energy consumption is distributed among four main sectors which are industrial, building (residential), transportation and agriculture. Approximately 33% of total energy consumption in Turkey is used by residential sector. This situation makes it more important to insulate buildings in our country where fuel prices are too high. Turkey is divided into four climatic zones depending on average temperature degree days of heating. In this study, the four different cities of Turkey, Izmir, Istanbul, Ankara and Erzurum are selected to determine the optimum insulation thickness of the external wall of buildings. Optimum insulation thickness for six different energy sources (Soma coal, natural gas, coal, LPG, fuel-oil, diesel fuel) and two different insulants (extruded polystyrene, rock wool) is calculated and compared to each other. In addition, by using life cycle cost analysis method. Pay back period is calculated for each zone.

Adding an expansive agent to increase the toughness of steel fibre reinforced concrete

2019 ◽  
Vol 26 (4) ◽  
pp. 197-208
Author(s):  
Leo Gu Li ◽  
Albert Kwok Hung Kwan
Keyword(s):  
Reinforced Concrete ◽  
Steel Fibre ◽  
The Other ◽  
Fibre Reinforced Concrete ◽  
Test Results ◽  
Compressive Properties ◽  
Shrinkage Cracking ◽  
Steel Fibre Reinforced Concrete ◽  
Expansive Agent ◽  
Concrete Matrix

Previous research studies have indicated that using fibres to improve crack resistance and applying expansive agent (EA) to compensate shrinkage are both effective methods to mitigate shrinkage cracking of concrete, and the additions of both fibres and EA can enhance the other performance attributes of concrete. In this study, an EA was added to fibre reinforced concrete (FRC) to produce concrete mixes with various water/binder (W/B) ratios, steel fibre (SF) contents and EA contents for testing of their workability and compressive properties. The test results showed that adding EA would slightly increase the superplasticiser (SP) demand and decrease the compressive strength, Young’s modulus and Poisson’s ratio, but significantly improve the toughness and specific toughness of the steel FRC produced. Such improvement in toughness may be attributed to the pre-stress of the concrete matrix and the confinement effect of the SFs due to the expansion of the concrete and the restraint of the SFs against such expansion.

Sign in / Sign up

Export Citation Format

Share Document