Thermal performance and condensation risk of single-pane glazing with low emissivity coatings

MRS Advances ◽  
2020 ◽  
Vol 5 (50) ◽  
pp. 2555-2564 ◽  
Author(s):  
Qiuhua Duan ◽  
Yuan Zhao ◽  
Julian Wang
Keyword(s):  
Thermal Performance ◽  
Comprehensive Analysis ◽  
Numerical Code ◽  
Outdoor Temperature ◽  
External Temperature ◽  
Local Climate ◽  
Inner Surface ◽  
Simulated Surface ◽  
The Given ◽  
Indoor Humidity

ABSTRACTTo understand the potential impacts on both thermal performance and condensation risks of using low-e coatings in buildings, especially in the single-pane sector, in this work, parametric numerical analysis in winter is conducted. Three building glazing models, including the single-pane without low-e coatings (SNL), single-pane with exterior low-e coatings (SEL), and single-pane with interior low-e coatings (SIL), are selected and simulated through COMSOL over a range of outdoor temperature and indoor humidity. The temperature of the interior surface of windows, heat flux through windows, winter U-factor of center-of-glass will be obtained and compared. Additionally, a numerical code is developed in R to compute and plot the condensation temperatures of these three models upon the given indoor humidity levels and simulated surface temperatures. The comprehensive analysis of condensation risks on the glazing inner surface of the three models will be conducted.This parametric simulation effort indicates an interesting feature for a single-pane window: while the SIL gives a substantially lower U than the SNL, it also corresponds to an increased condensation risk under certain limits of external temperature and indoor humidity levels. Upon the resultant condensation temperatures and thermal performance analysis, we can conclude the parameters of the windowpane property, coating emissivity and placement, local climate, and building interior thermal settings must be taken into account collectively when it comes to adding low-e coatings to single-pane windows.

scholarly journals Mathematics Modelling and Performance Analysis of the Heat Transfer on Vacuum Tube Collector of Water Heater Application

2020 ◽  
Vol 190 ◽  
pp. 00022
Author(s):  
Lia Hamanda ◽  
Gunawan Nugroho
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Thermal Performance ◽  
Solar Collector ◽  
Dynamic Behaviour ◽  
Tube Axis ◽  
Outdoor Temperature ◽  
Water Heater ◽  
And Performance ◽  
Mathematical Modelling And Simulation

The aim of this work is to study a mathematical modelling and simulation for predicting the thermal performance heat-pipe evacuated a solar collector for water heater, which was considered the temperature distribution along the tube axis and radius. This model used to help in studying the dynamic behaviour of the system design and the effect of influential parameter on the water heater process. The result showed that water heating is affected by the surface of collector, metrological conditions such as solar radiation and outdoor temperature, even the thermal performance of the collector.

scholarly journals Effects of the Circuit Arrangement on the Thermal Performance of Double U-Tube Ground Heat Exchangers

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3275
Author(s):  
Aminhossein Jahanbin ◽  
Giovanni Semprini ◽  
Andrea Natale Impiombato ◽  
Cesare Biserni ◽  
Eugenia Rossi di Schio
Keyword(s):  
Thermal Resistance ◽  
Thermal Performance ◽  
Numerical Code ◽  
Geometrical Parameters ◽  
Fluid Temperature ◽  
The Finite Element Method ◽  
Ground Heat Exchangers ◽  
Borehole Thermal Resistance ◽  
The Impact ◽  
Circuit Configuration

Given that the issue of variations in geometrical parameters of the borehole heat exchanger (BHE) revolves around the phenomenon of thermal resistance, a thorough understanding of these parameters is beneficial in enhancing thermal performance of BHEs. The present study seeks to identify relative changes in the thermal performance of double U-tube BHEs triggered by alterations in circuit arrangements, as well as the shank spacing and the borehole length. The thermal performance of double U-tube BHEs with different configurations is comprehensively analyzed through a 3D transient numerical code developed by means of the finite element method. The sensitivity of each circuit configuration in terms of the thermal performance to variations of the borehole length and shank spacing is investigated. The impact of the thermal interference between flowing legs, namely thermal short-circuiting, on parameters affecting the borehole thermal resistance is addressed. Furthermore, the energy exchange characteristics for different circuit configurations are quantified by introducing the thermal effectiveness coefficient. The results indicate that the borehole length is more influential than shank spacing in increasing the discrepancy between thermal performances of different circuit configurations. It is shown that deviation of the averaged-over-the-depth mean fluid temperature from the arithmetic mean of the inlet and outlet temperatures is more critical for lower shank spacings and higher borehole lengths.

Analysis of dynamic thermal performance of the walls in residential buildings in Serbia

2020 ◽  
pp. 095440622094189
Author(s):  
Saša M Kalinović ◽  
Jelena M Djoković
Keyword(s):  
Thermal Performance ◽  
Residential Buildings ◽  
Thermal Characteristics ◽  
Optimal Solution ◽  
Temperature Oscillation ◽  
Thermal Capacity ◽  
Paper Analysis ◽  
Wall Structure ◽  
Total Thickness ◽  
External Temperature

In this paper, analysis of dynamic thermal performance of multilayer insulation wall in residential buildings in Serbia is performed. Considering that the final goal is to build a residential structure with the highest level of efficiency, that is, with the lowest energy consumption for heating and cooling, it is necessary to determine good thermal characteristics of a multilayer wall. The first type of walls, which were analyzed had the same structure with different thicknesses of individual layers. The second type of analyzed walls had the same structure, but the thermo-insulating layers occupied different positions. The third type of walls had different structures, but the same total thickness. Based on the results presented in the paper, it can be concluded that in walls with similar structures, the same total thickness and different thicknesses of individual layers, there are differences in the external temperature variation shift. The position of the thermal insulation layer for the same wall structure does not significantly affect the change in temperature oscillation caused by the change in the outside temperature. Changing the wall structure, however, has significant influence on the thermal capacity. This analysis offers the possibility to choose the optimal solution for the wall structure with the highest energy efficiency.

scholarly journals In situ monitoring of internal surface temperature of the historic building envelope

2016 ◽  
Vol 11 (1) ◽  
pp. 77-84
Author(s):  
Veronika Labovská ◽  
Dušan Katunský
Keyword(s):  
Surface Temperature ◽  
Internal Surface ◽  
Building Envelope ◽  
In Situ Monitoring ◽  
Heat Accumulation ◽  
Historical Building ◽  
External Temperature ◽  
Inner Surface ◽  
Real Behavior

Abstract Historical building envelope is characterized by a large accumulation that impact is mainly by changing the inner surface temperature over time. The minimum value of the inner surface temperature is set Code requirements. In the case of thermal technology assessment of building envelope contemplates a steady state external temperature and internal environment, thereby neglecting the heat accumulation capacity of building envelopes. Monitoring surface temperature in real terms in situ shows the real behavior of the building envelope close to reality. The recorded data can be used to create a numerical model for the simulation.

scholarly journals Do endotherms have thermal performance curves?

2021 ◽  
Vol 224 (3) ◽  
pp. jeb141309
Author(s):  
Danielle L. Levesque ◽  
Katie E. Marshall
Keyword(s):  
Body Temperature ◽  
Thermal Performance ◽  
Environmental Temperature ◽  
Comparative Approach ◽  
Evaporative Heat Loss ◽  
External Temperature ◽  
Performance Curves ◽  
Interspecific Comparisons ◽  
Measure Of Performance ◽  
Environmental Temperatures

ABSTRACTTemperature is an important environmental factor governing the ability of organisms to grow, survive and reproduce. Thermal performance curves (TPCs), with some caveats, are useful for charting the relationship between body temperature and some measure of performance in ectotherms, and provide a standardized set of characteristics for interspecific comparisons. Endotherms, however, have a more complicated relationship with environmental temperature, as endothermy leads to a decoupling of body temperature from external temperature through use of metabolic heat production, large changes in insulation and variable rates of evaporative heat loss. This has impeded our ability to model endothermic performance in relation to environmental temperature as well as to readily compare performance between species. In this Commentary, we compare the strengths and weaknesses of potential TPC analogues (including other useful proxies for linking performance to temperature) in endotherms and suggest several ways forward in the comparative ecophysiology of endotherms. Our goal is to provide a common language with which ecologists and physiologists can evaluate the effects of temperature on performance. Key directions for improving our understanding of endotherm thermoregulatory physiology include a comparative approach to the study of the level and precision of body temperature, measuring performance directly over a range of body temperatures and building comprehensive mechanistic models of endotherm responses to environmental temperatures. We believe the answer to the question posed in the title could be ‘yes’, but only if ‘performance’ is well defined and understood in relation to body temperature variation, and the costs and benefits of endothermy are specifically modelled.

Measuring and Optimizing Thermal Interface Material Performance for VR Heatsink Designs

2015 ◽  
Author(s):  
Jun Lu ◽  
Michelle C. Lin ◽  
Bernie Short
Keyword(s):  
Thermal Performance ◽  
Mechanical Test ◽  
Thermal Interface Material ◽  
Thermal Testing ◽  
Performance Measurements ◽  
Thermal Interface ◽  
Test Board ◽  
And Performance ◽  
The Right ◽  
The Given

With increasingly high powers on processors, memories, and chipsets, the voltage regulators (VR) become heavily loaded and a heatsink is often required to prevent overheating the surrounding components on the board. For VR heatsink designs, thermal interface silicone gap filler pads are often used and there is an increasing need to improve VR thermal solutions by reducing thermal resistance of the TIM. A series of TIM2 thickness and performance measurements based on thermal testing was performed in order to understand gap filler characteristics, optimize TIM performance, and utilize best retention design. By utilizing a VR thermal and mechanical test board in wind tunnel testing using the same VR heatsink, thermal performance of TIM2 using gap filler pads over a range of airflow velocities can be measured and compared. The study shows how the optimum TIM performance can be achieved by using the gap filler pads with appropriate thickness for the given designed heatsink standoff heights. The benefit of choosing the right thickness pads over others can be significant and is a valuable learning that can be applied to future VR heatsink designs. Furthermore, the silicone gap filler characteristics and its relationship to board bending and result TIM thickness and thermal performance are investigated and further improved. The learnings help understand the limitations and where the area of improvement can be for future VR heatsink designs.

Experimental and Numerical Investigation of Fretting Wear at High Temperature for Aeronautical Alloys

2010 ◽  
Author(s):  
D. Botto ◽  
A. Campagna ◽  
M. Lavella ◽  
M. M. Gola
Keyword(s):  
Three Dimensional ◽  
Experimental Tests ◽  
Fretting Wear ◽  
Numerical Code ◽  
Dissipated Energy ◽  
Hysteresis Cycle ◽  
Set Up ◽  
Wear Law ◽  
Low Amplitude ◽  
The Given

Fretting wear is a complex phenomenon that occurs at component interfaces that undergo low amplitude oscillation under high contact pressure. The aim of this paper is to investigate the fretting behavior of contact interfaces both with experiments and numerical code. The hysteresis cycles have been measured through the experiment and, at the end of the test, the worn volume has been determined. A numerical code has been developed to predict worn volume. The three-dimensional elastic contact problem has been solved by using a semi-analytical half space model. The numerical code uses a wear law for which the worn volume is proportional to the dissipated energy during the hysteresis cycle. The wear coefficient has been iteratively determined by comparing the theoretical results with the experimental tests. The main results of this work is the set up of a wear model for the given geometry and materials.

scholarly journals RURAL TOURISM AS A FACTOR OF SUSTAINABLE DEVELOPMENT IN THE NOVOSHESHMINSKY REGION IN TATARSTAN

2020 ◽  
Vol 22 (6) ◽  
pp. 40-50
Author(s):  
S. V. Novikov ◽  
V. L. Osina
Keyword(s):  
Sustainable Development ◽  
Urban Development ◽  
Rural Areas ◽  
Comprehensive Analysis ◽  
Rural Tourism ◽  
Development Environment ◽  
The Sustainable Development ◽  
Foreign Experience ◽  
The Republic ◽  
The Given

This paper develops the principles of the architectural and urban development environment of rural tourism in the e Novosheshminsky region of the Republic of Tatarstan. The concept of rural tourism, a comprehensive analysis of the tourist potential of the Novosheshminsky region and Tatarstan and foreign experience allow developing principles of creating a comfortable tourist environment. The paper identifies significant aspects of organizing the touristic infrastructure in the rural areas and their correct use in the given conditions, the Novosheshminsky region, in particular. The concept of the sustainable development of this region will be further developed.

STYLISTIC STAGES AND SPATIAL PLANNING SOLUTIONS IN THE ARCHITECTURE OF THE ENSEMBLE OF BUILDINGS AND STRUCTURES OF THE TOWN OF KORENNAYA PUSTYN IN THE KURSK REGION 2ND HALF OF THE XVIII – 1ST HALF OF THE XIX CENTURIES

2021 ◽  
Vol 95 (3) ◽  
pp. 109-129
Author(s):  
E.V. KHOLODOVA ◽  
◽  
Keyword(s):  
Russian Federation ◽  
Spatial Planning ◽  
Comprehensive Analysis ◽  
Full Scale ◽  
The Russian Federation ◽  
The Given ◽  
The Village ◽  
The Town ◽  
Kursk Region ◽  
Printed Sources

The study is based on little-known factual material: a comprehensive analysis of documentary and printed sources of central and regional archives, museums and libraries; family domestic and foreign archives; a full-scale survey of the preserved fragments of the Korennaya Pustyn settlement. The scientific novelty of the research is connected with the author's expeditions and surveys of the development complex of the village of Korennaya Pustyn (monastery, fair, village) (measurements, photo-fixation, full-scale sketches), archival and printed sources that resurrect images of lost noble and merchant estates of dachas are identified, and a general analysis of the given topic is carried out. An important result of the study is the disclosure of the phenomenon of country estate construction of the Kursk province settlement as part of the monastery and fair complex of the town of Korennaya Pustyn in the 2nd half of the XVIII – 1st half of the XIX centuries.. The paper considers the features of stylistic stages and spatial planning solutions in the architecture of the ensemble of buildings and structures of a unique settlement. The research was carried out at the expense of the State Program of the Russian Federation "Development of Science and Technology" within the framework of the Plan of Basic Scientific Research of the Ministry of Construction of the Russian Federation and the RAASN.

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