Thermal performance of different pond cells under actual climatic conditions in Qatar

1999 ◽  
Vol 16 (1-4) ◽  
pp. 695-699 ◽  
Author(s):  
A-Hamid Marafia ◽  
Sami Nasser ◽  
Ali Sayigh
Keyword(s):  
Thermal Performance ◽  
Climatic Conditions

scholarly journals Thermal Performance of a Concrete Cool Roof under Different Climatic Conditions of Mexico

2014 ◽  
Vol 57 ◽  
pp. 1753-1762 ◽  
Author(s):  
I. Hernández-Pérez ◽  
G. Álvarez ◽  
H. Gilbert ◽  
J. Xamán ◽  
Y. Chávez ◽  
...  
Keyword(s):  
Thermal Performance ◽  
Climatic Conditions ◽  
Cool Roof

Effective R-value of enclosed reflective space for different building applications

2019 ◽  
Vol 43 (5) ◽  
pp. 398-427 ◽  
Author(s):  
Hamed H Saber ◽  
Wahid Maref ◽  
Ali E Hajiah
Keyword(s):  
Heat Flow ◽  
Thermal Performance ◽  
Accurate Determination ◽  
Energy Performance ◽  
Climatic Conditions ◽  
Operating Conditions ◽  
Building Envelopes ◽  
Inclination Angles ◽  
R Value ◽  
Enclosed Space

Many parts of the building envelopes contain enclosed airspaces. Also, the insulating glass units in fenestration systems, such as curtain walls, windows, and skylight devices, contain enclosed spaces that are normally filled with air or heavy gas such as argon, xenon, or krypton. The thermal resistance (R-value) of an enclosed space depends mainly on the type of the filling gas, emissivity of all surfaces that bound the space, the size and orientation of the space, the direction of heat flow through the space, and the respective temperatures of all surfaces that define the space. Assessing the energy performance of building envelopes and fenestration systems, subjected to different climatic conditions, requires accurate determination of the R-values of the enclosed spaces. In this study, a comprehensive review is conducted on the thermal performance of enclosed airspaces for different building applications. This review includes the computational and experimental methods for determining the effective R-value of enclosed reflective airspaces. Also, the different parameters that affect the thermal performance of enclosed airspaces are discussed. These parameters include the following: (a) dimensions, (b) inclination angles, (c) directions of heat flow, (d) emissivity of all surfaces that bound the space, and (e) operating conditions. Moreover, numerical simulations are conducted using a previously developed and validated model to investigate the effect of the inclination angle, direction of heat transfer, and the coating emissivity on the R-values of enclosed spaces when they are filled with different types of gases.

Thermal performance of an insulated roof with reflective insulation: Field tests under hot climatic conditions

2012 ◽  
Vol 36 (3) ◽  
pp. 229-246 ◽  
Author(s):  
Marco D’Orazio ◽  
Costanzo Di Perna ◽  
Elisa Di Giuseppe ◽  
Matteo Morodo
Keyword(s):  
Thermal Performance ◽  
Field Tests ◽  
Climatic Conditions

Comparative Analysis of the Use of Thermal Insulation Materials Depending on Climatic Conditions and Comfort Microclimate Supply Systems

2022 ◽  
Vol 906 ◽  
pp. 99-106
Author(s):  
Siranush Egnatosyan ◽  
David Hakobyan ◽  
Spartak Sargsyan
Keyword(s):  
Energy Efficiency ◽  
Comparative Analysis ◽  
Thermal Insulation ◽  
Thermal Performance ◽  
Climatic Conditions ◽  
Insulation Material ◽  
Insulation Layer ◽  
Transfer Resistance ◽  
Insulation Materials ◽  
Wide Range

The use of thermal insulation materials to reduce the heating and cooling demand of the building in order to provide energy efficiency is the main solution. But there is a wide range of these products on the market and, therefore, the choice and application of these materials is a rather difficult task, since many factors must be taken into account, such as environmental safety, cost, durability, climatic conditions, application technology, etc. Basically, comfort microclimate systems are designed based on normative standards, where the thickness of the thermal insulation material is selected depending on the required heat transfer resistance. These values are calculated taking into account climate conditions, that is the duration of the heating period, as well as taking into account sanitary and hygienic requirements. This article discusses the thermal performance of building materials, and also provides a comparative analysis of the use of thermal insulation materials depending on climatic factors and on the system providing comfort microclimate. Based on the calculations by mathematical modeling and optimization, it is advisable to choose the thickness of the thermal insulation, taking into account the capital and operating costs of the comfort microclimate systems. Comparing the optimization data with the normative one, the energy efficiency of the building increases by 50-70% when applying the optimal thickness of the thermal insulation layer, and when the thermal insulation layer is increased, the thermal performance of the enclosing structures has improved by 30%, which contributes to energy saving.

scholarly journals Solar Gain Influence on the Thermal and Energy Performance of Existing Mosque Buildings in the Hot-Arid Climate of Riyadh City

2021 ◽  
Vol 13 (6) ◽  
pp. 3332
Author(s):  
Ahmed Ali A. Shohan ◽  
Hanan Al-Khatri ◽  
Ahmed Ali Bindajam ◽  
Mohamed B. Gadi
Keyword(s):  
Thermal Performance ◽  
Thermal Conditions ◽  
Energy Performance ◽  
Climatic Conditions ◽  
Future Research ◽  
Analysis Software ◽  
Riyadh City ◽  
Hot Arid Climate ◽  
Reported Study ◽  
Proper Design

The required cooling energy in buildings exceeds 65% of the total energy consumed inside buildings under the extreme climatic conditions of Saudi Arabia. The proper design of buildings’ envelopes has a considerable potential in reducing such levels, especially in public buildings. The reported study evaluated the thermal performance of mosque buildings with focus on the solar gains through the envelope elements. Computer simulations were carried out using Thermal Analysis Software (TAS). In addition, the thermal and comfort votes of the worshippers in one mosque were collected. The findings revealed uncomfortable thermal conditions, especially during summer months. The required cooling energy ranged between 37% and 55% in the investigated mosques. Investigating the solar gains of the envelope elements of one mosque indicated that the roof is the largest contributor to solar gain, which highlights the potential for future research to explore new constructional alternatives with the aim of improving the roofs’ thermal performance.

Thermal Performance Comparison and Augmentation of Two Identical Box-Type Solar Cookers Operating in Tropical Climatic Conditions

2021 ◽  
pp. 1-26
Author(s):  
Md. Reyaz Arif ◽  
Mohd Athar Khan ◽  
Md Azhar ◽  
Naiem Akhtar ◽  
Md Meraj
Keyword(s):  
Heat Transfer ◽  
Thermal Performance ◽  
Transfer Rate ◽  
Figure Of Merit ◽  
Experimental Studies ◽  
Load Condition ◽  
Performance Comparison ◽  
Climatic Conditions ◽  
Performance Parameters ◽  
Absorber Plate

Abstract In the present study, experimental studies have been performed to compare the thermal performance of two geometrically identical box-type solar (B-T-S) cookers. To carry out this aim, the thermal performance of BTS in terms of figure of merits, namely, first figure of merit (F1) and second figure of merit (F2) are calculated for both cooker as specified by the Bureau of Indian standards (BIS). At no load condition (i.e. stagnation test), it is found that first figure of merit for both cookers that is cooker 1, and cooker 2 is around 0.12. This implies that, both the cookers are identical in thermal performance. In addition to this, the effect of lugs height, reflectors numbers of pots and load on B-T-S cooker performance have also been investigated. From the results and discussion, it is concluded that the use of lugs reduced the heat transfer rate between cooking pot and absorber plate. Further it is found that the pot content temperature is enhanced by 25.5% and 23.4% by using mirror and aluminium reflector with cooker, respectively. While, it is observed that the performance parameters of B-T-S cooker in terms of F2 increases linearly with the increase of numbers of cooking pot (with correlation F2 = 0.0316n + 0.2238, where n is number of pots) and load (correlation as F2 = 0.0451m + 0.1844, where m is the mass of water in cooking pot) on the pot.

SUSTAINABLE BUILDING PREFABRICATED ELEMENT BASED ON STABILIZED RESIDUAL QUARRY SLUDGE AND ITS HEAT TRANSFER ANALYSIS

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Andres Felipe Restrepo R. ◽  
Nicolas Zapata P. ◽  
Juan David Torrenegra R. ◽  
Yhan Paul Arias J. ◽  
Juan Carlo Ochoa B.
Keyword(s):  
Heat Transfer ◽  
Thermal Performance ◽  
Load Capacity ◽  
Construction Materials ◽  
Mining Industry ◽  
Climatic Conditions ◽  
Heat Transfer Analysis ◽  
Surface Model ◽  
Sustainable Building ◽  
Production Chain

In this work, a prefabricated masonry element is produced by reusing a residual sludge generated by the Colombian mining industry, especially the sandstone quarries. The addition of Ca (OH) 2 and NaOH stabilizes this waste. Application of a response surface model results in optimal admixture specifications, achieving improvements in load capacity (8 MPa) and durability according to its dimensional stability, upgrading the traditional techniques. Albeit remains a lack in the study of its thermal behavior. Thus, A heat transfer analysis employing computational simulations based on the Finite Element Method (FEM) is applied to predict the thermal performance of manufactured elements with stabilized quarry sludge (SQS). Besides, several construction materials are simulated, allowing their contrast and the complement between simulation and experimentation, pointing to the achievement of a good performance in different climatic conditions, including actual city case characteristics. It is concluded that according to SQS block thermal performance, it can be a suitable building element candidate. Hence, more sustainable processes in the mining and construction production chain can be achieved.

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