scholarly journals Numerical analysis of the thermal comfort in a church building

2019 ◽  
Vol 85 ◽  
pp. 02008
Author(s):  
Florin Emilian Ţurcanu ◽  
Marina Verdeş ◽  
Vasilică Ciocan ◽  
Andrei Burlacu ◽  
Răzvan Silviu Luciu ◽  
...  
Keyword(s):  
Experimental Data ◽  
Numerical Analysis ◽  
Thermal Comfort ◽  
Simulation Model ◽  
Winter Season ◽  
Heating System ◽  
Velocity Profiles ◽  
Air Velocity ◽  
Comfort Evaluation ◽  
Church Building

Based on the monitoring campaigns, we have evaluated the indoor microclimate in a church. Most church buildings are characterised by low thermal comfort due primarily to their architecture, heating huge volume of air. The CFD tools was used for thermal comfort evaluation in case of the existing heating system during the winter season. The simulation model was validated with experimental data and it was used for thermal and air velocity profiles in the occupancy zone of churchgoers. The aim of the paper is the study the feasibility of maintaining the heritage values of the churches while achieving the significant improvement of the thermal comfort.

Analysis of Thermal Comfort in Flat in New High Residential Building

2016 ◽  
Vol 861 ◽  
pp. 361-368
Author(s):  
Mária Budiaková
Keyword(s):  
Thermal Comfort ◽  
Architectural Design ◽  
Residential Buildings ◽  
Winter Season ◽  
Residential Building ◽  
Heating System ◽  
Residential Areas ◽  
Air Velocity ◽  
Globe Temperature ◽  
The Individual

This paper focuses on the analysis of thermal comfort in a flat in the new high residential building. Providing the optimal parameters of thermal comfort in each room of the flat is the basic prerequisite for the satisfaction with housing. Incorrect position and size of heating elements, incorrect positioning of the furniture and incorrect use of residential interiors may significantly disturb the thermal comfort. Residential areas in the new residential buildings are much more intensively used as in the other types of buildings. Surface of new flats is the most optimized. Experimental measurements were carried out in the winter season in 2016 in the residential rooms of the large flat in the new high residential building. Device Testo 480 with temperature and humidity sensor, globe thermometer and turbulence sensor was used for the measurements. Obtained values of air temperature, air relative humidity, air velocity, globe temperature and indexes PMV, PPD are presented in the graphs. Heating system of the flat and the possibility of its regulation, positioning and size of the heating elements in the individual rooms, positioning of the furniture and the utilization of rooms were evaluated on the basis of parameters of thermal comfort. In the conclusion of the paper, there are principles on the architectural design of the residential interiors and their heating in the new residential buildings.

Evaluation of Indoor Climate in Small University Lecture Hall

2016 ◽  
Vol 861 ◽  
pp. 369-375
Author(s):  
Mária Budiaková
Keyword(s):  
Thermal Comfort ◽  
Architectural Design ◽  
Winter Season ◽  
Lecture Hall ◽  
Experimental Measurements ◽  
Optimal Parameters ◽  
Indoor Climate ◽  
Air Velocity ◽  
Globe Temperature ◽  
The University

This paper is focuses on the evaluation of the indoor climate in the small university lecture hall. Providing the optimal parameters of thermal comfort in the interiors of a university is immensely important for the students of the university. Fulfilling these parameters is inevitable not only for the physiological needs of students but also for the required performance of students. Reconstruction took place in the small university lecture hall. The original windows were exchanged for the modern wood tight windows. Experimental measurements were carried out in the winter season in 2016 in this small university lecture hall in order to evaluate the thermal comfort after the reconstruction. The device Testo 480 was used for the measurements. Obtained values of air temperature, air relative humidity, air velocity, globe temperature and indexes PMV, PPD are presented in the graphs. Heating, operation and architectural design of the small university lecture hall were evaluated on the basis of the parameters of thermal comfort. In the conclusion of this paper, there are principles how to design new small university lecture halls. Furthermore, there are presented recommendations how to operate the existing small university lecture halls.

Evaluation of Indoor Climate in Big Lecture Hall

2019 ◽  
Vol 887 ◽  
pp. 475-483
Author(s):  
Mária Budiaková
Keyword(s):  
Thermal Comfort ◽  
Ventilation System ◽  
Winter Season ◽  
Point Of View ◽  
Lecture Hall ◽  
Experimental Measurements ◽  
Optimal Parameters ◽  
Indoor Climate ◽  
Air Velocity ◽  
Operation System

The paper is oriented on the evaluation of the indoor climate in the big lecture hall. Providing the optimal parameters of the thermal comfort and the CO2 concentration is immensely important for the students in the interiors of a university. Meeting these parameters is inevitable not only from physiological point of view but also for achieving the desirable students' performance. The high CO2 concentration is related to incorrect and insufficient ventilation in the lecture hall and causes distractibility and feeling of tiredness of students. Experimental measurements were carried out in the winter season in 2016 in the big lecture hall in order to evaluate the thermal comfort and the CO2 concentration. The device Testo 480 was used for the measurements. Obtained values of air temperature, air relative humidity, air velocity, CO2 concentration are presented in the charts. Mechanical ventilation system and operation system of the big university lecture hall were evaluated on the basis of the parameters of the thermal comfort and on the basis of the CO2 concentration. Based on the findings, design recommendations for new big university lecture halls are derived. Furthermore, there are presented recommendations how to operate the existing big university lecture halls.

scholarly journals Cold windows induced airflow effects on the thermal environment for a large single-zone building

2020 ◽  
Vol 172 ◽  
pp. 06003
Author(s):  
Ying Zhang ◽  
Thomas Olofsson ◽  
Gireesh Nair ◽  
Chenbo Zhao ◽  
Bin Yang ◽  
...  
Keyword(s):  
Thermal Comfort ◽  
Energy Use ◽  
Thermal Environment ◽  
Heating System ◽  
Technical Data ◽  
Advantages And Disadvantages ◽  
Complex Design ◽  
Church Building ◽  
Large Building ◽  
Floor Heating

With access to modern building technologies and HVAC-systems, it is possible to obtain low energy use and good thermal comfort for complex design, such as large building volumes. However, the situation is different for large single zone buildings with large volumes. They often have insufficient thermal comfort. The problem could be partially attributed to the unwanted airflows due to the cold surfaces, especially the windows. With increased knowledge of the airflow, it is possible to identify suitable renovation strategies in such buildings. In this work, we study a church building with mechanical air change system and floor heating. CFD-simulations with dynamic airflow was conducted based on building geometries and technical data. The validation was based on data from the ventilation control and the space-heating system. The results show how the window-to-wall ratios and the positions of windows affect the thermal comfort. It contributes with knowledge of advantages and disadvantages of different envelope design in the existing environment with floor heating.

scholarly journals Indoor Climate Simulation in a Church During Winter Season

2019 ◽  
Vol 9 (1) ◽  
pp. 25-28
Author(s):  
Ana Diana Ancas ◽  
Florin-Emilian Turcanu ◽  
Mihai Profire ◽  
Marina Verdes ◽  
Marius Costel Balan
Keyword(s):  
Thermal Comfort ◽  
Winter Season ◽  
Heating System ◽  
Simulation Software ◽  
Climate Simulation ◽  
Design Stage ◽  
Indoor Climate ◽  
Cfd Modelling ◽  
Software Environment ◽  
Made In

Abstract In the paper is presented a heating system installed in church and the interior climate generated. Thermal Comfort is the purpose of each designer, since the design stage and has to be ensure for the churchgoers, but even for the interior finishes. The heating system that uses hydronic radiators is evaluated trough the CFD modelling, in order to evaluate pro and contra arguments. The simulation has been made in a 3d simulation software environment, in Autodesk CFD with good results.

scholarly journals Simulation and modelling of microclimate in a building with high thermal mass during the winter season

2019 ◽  
Vol 85 ◽  
pp. 01006
Author(s):  
Florin Emilian Ţurcanu ◽  
Marina Verdeş ◽  
Vasilică Ciocan ◽  
Andrei Burlacu ◽  
Marius Costel Bălan ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
System Performance ◽  
Winter Season ◽  
Heating System ◽  
Simulation Method ◽  
Thermal Mass ◽  
Indoor Climate ◽  
Simulation And Modelling ◽  
Historical Heritage

This paper presents the simulation method for evaluating the heating system from a church. The inside climate has been evaluated by measures of temperature and humidity taken in the winter season. The aim of the paper is to model and validate the indoor climate measures thought numerical analysis and to evaluate the heating system performance. The paper include a case study over and representative category of buildings, used as worship place that can contain heritage values. Nowadays, to conserve the historical heritage is a fact studied in many countries of Europe.

Thermal Comfort Evaluation with Fireplace in Occupied Space

2013 ◽  
Vol 649 ◽  
pp. 129-132 ◽  
Author(s):  
Radoslav Ponechal ◽  
Silvia Baďurová
Keyword(s):  
Thermal Comfort ◽  
Air Temperature ◽  
Infrared Camera ◽  
Heating System ◽  
Living Room ◽  
Air Velocity ◽  
Comfort Levels ◽  
Occupant Comfort ◽  
Thermal Climate ◽  
The Mean

The solid fuel heaters are popular in Slovakia again, where about 50% of new freestanding homes have one. The classic fireplace, with a blazing fire open to the room as traditional symbol of comfort and security becomes with better building thermal insulation a primary rather than an occasional indulgence heat source. This paper reports the results of field measurement and simulation investigating the thermal comfort criteria in occupied space with fireplace heating system. The field study was performed in a small furnished living-room. The indoor surface temperatures were captured with infrared camera and the mean radiant temperatures were calculated by the ESP-r simulation tool. Thermal comfort prediction maps (PPD and PMV index) are presented to describe range of occupant comfort levels with mean air temperature, air velocity and clothing level variations. It was found that this system provide full area improved thermal climate only with high air temperature level. The study was limited to the case with no vertical air temperature distribution.

scholarly journals CFD simulation of a cabin thermal environment with and without human body – thermal comfort evaluation

2018 ◽  
Vol 32 ◽  
pp. 01018 ◽  
Author(s):  
Paul Danca ◽  
Florin Bode ◽  
Ilinca Nastase ◽  
Amina Meslem
Keyword(s):  
Thermal Comfort ◽  
Human Body ◽  
Physical State ◽  
Cfd Simulation ◽  
Thermal Environment ◽  
Passenger Compartment ◽  
Air Velocity ◽  
Cfd Simulations ◽  
Comfort Evaluation ◽  
Higher Power

Nowadays, thermal comfort became one of the criteria in choosing a vehicle. In last decades time spent by people in vehicles had risen substantially. During each trip, thermal comfort must to be ensured for a good psychological and physical state of the passengers. Also, a comfortable environment leads to a higher power concentration of the driver thereby to a safe trip for vehicle occupants and for all traffic participants. The present study numerically investigated the effect of human body sited in the driver's place, over the air velocity distribution and over the thermal comfort in a passenger compartment. CFD simulations were made with different angles of the left inlet grill, in both cases, with and without driver presence. In majority of the actual vehicles environment studies, are made without consideration of human body geometry, in this case, the results precision can be affected. The results show that the presence of human body, lead to global changing of the whole flow pattern inside the vehicular cabin. Also, the locations of the maximum velocities are changing with the angle of the guiding vanes. The thermal comfort PMV/PPD indexes were calculated for each case. The presence of human body leads to a more comfortable environment.

scholarly journals Impacts on Indoor Thermal Comfort and Heating Energy Use in Hellenic Dwellings from Occupant Behavioral Reactions

2021 ◽  
Vol 11 (14) ◽  
pp. 6254
Author(s):  
Elena G. Dascalaki ◽  
Constantinos A. Balaras
Keyword(s):  
Thermal Comfort ◽  
Energy Use ◽  
Energy Savings ◽  
Local Heating ◽  
Economic Recession ◽  
Heating System ◽  
Building Stock ◽  
Heating Systems ◽  
Indoor Thermal Comfort ◽  
Energy Audits

In an effort to reduce the operational cost of their dwellings, occupants may even have to sacrifice their indoor thermal comfort conditions. Following the economic recession in Greece over recent years, homeowners have been forced to adapt their practices by shortening heating hours, lowering the indoor thermostat settings, isolating spaces that are not heated or even turning off their central heating system and using alternative local heating systems. This paper presents the results from over 100 occupant surveys using questionnaires and walk-through energy audits in Hellenic households that documented how occupants operated the heating systems in their dwellings and the resulting indoor thermal comfort conditions and actual energy use. The results indicate that the perceived winter thermal comfort conditions were satisfactory in only half of the dwellings, since the actual operating space heating periods averaged only 5 h (compared with the assumed 18 h in standard conditions), while less than half heated their entire dwellings and only a fifth maintained an indoor setpoint temperature of 20 °C, corresponding to standard comfort conditions. Mainstream energy conservation measures include system maintenance, switching to more efficient systems, reducing heat losses and installing controls. This information is then used to derive empirical adaptation factors for bridging the gap between the calculated and actual energy use, making more realistic estimates of the expected energy savings following building renovations, setting prudent targets for energy efficiency and developing effective plans toward a decarbonized building stock.

Optimization of the Navy’s three-dimensional mine impact burial prediction simulation model, Impact35, using high-order numerical methods

2021 ◽  
pp. 154851292110286
Author(s):  
Athanasios Donas ◽  
Ioannis Famelis ◽  
Peter C Chu ◽  
George Galanis
Keyword(s):  
Numerical Analysis ◽  
Numerical Methods ◽  
Prediction Model ◽  
Simulation Model ◽  
Three Dimensional ◽  
Simulation System ◽  
High Order ◽  
Alternative Methodology ◽  
Runge Kutta ◽  
Fifth Order

The aim of this paper is to present an application of high-order numerical analysis methods to a simulation system that models the movement of a cylindrical-shaped object (mine, projectile, etc.) in a marine environment and in general in fluids with important applications in Naval operations. More specifically, an alternative methodology is proposed for the dynamics of the Navy’s three-dimensional mine impact burial prediction model, Impact35/vortex, based on the Dormand–Prince Runge–Kutta fifth-order and the singly diagonally implicit Runge–Kutta fifth-order methods. The main aim is to improve the time efficiency of the system, while keeping the deviation levels of the final results, derived from the standard and the proposed methodology, low.

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