scholarly journals Improving Energy Efficiency by Utilizing Wetted Cellulose Pads in Passive Cooling Systems

Energies ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 369
Author(s):  
Ebrahim Morady ◽  
Madjid Soltani ◽  
Farshad Moradi Kashkooli ◽  
Masoud Ziabasharhagh ◽  
Armughan Al-Haq ◽  
...  
Keyword(s):  
Passive Cooling ◽  
The Novel ◽  
Airflow Velocity ◽  
Cross Sectional ◽  
Cooling Systems ◽  
Good Potential ◽  
Novel Concept ◽  
Passive Cooling Systems ◽  
The Impact ◽  
Psychrometric Chart

The effectiveness of using wetted cellulose pads on improving the performance of two conventional passive cooling systems has been evaluated. First, an experimental design was developed to determine the impact of using a wetted cellulose pad on the temperature and velocity of the airflow. A cellulose pad (7090 model) with a cross-sectional area of 0.5 × 0.5 m2 and three different thicknesses of 10, 15, and 30 cm were selected and tested. The results indicated that using wetted cellulose pads with thicknesses ranging from 10–30 cm decreased the outlet airflow temperature from 11.3 to 13.7 °C on average. For free airflow at velocity 3.5 m/s, the outlet airflow velocity from the wetted cellulose pad decreased to 0.9, 0.7 and 0.6 m/s, respectively, for cellulose pads with thicknesses of 10, 15, and 30 cm. By applying experimental results on a psychrometric chart, the humidity ratio of outlet airflow was obtained between 40–70%. The study established airflow velocity as the critical parameter in passive cooling systems. With the novel concept of combining wetted cellulose pads for passive cooling systems (i.e., wind catchers and induced ventilation), there is good potential to reduce the energy requirements for thermal comfort in buildings in regions with a hot and arid climate.

scholarly journals An overview on passive cooling systems in green building architectures

2019 ◽  
pp. 01-15
Author(s):  
Jani DB
Keyword(s):  
Energy Consumption ◽  
Thermal Comfort ◽  
Heat Dissipation ◽  
Green Building ◽  
Passive Cooling ◽  
High Grade ◽  
Cooling Systems ◽  
Mechanical Methods ◽  
Passive Cooling Systems ◽  
The Impact

The continuous progressive demand of building construction raises many issues regarding supply of high grade electricity. It creates many environmental issues for its production like as global warming. So, the passive cooling buildings were welcomed to respond variable climate in order to reduce energy supply for thermal comfort as well as health of building users. The aim of designing a passive building is to take best advantage of the regional outdoor ambient conditions. Passive cooling refers to a building architectural approach that mainly goal on heat gain control and heat dissipation in a architectural structure in order to ameliorate the indoor thermal comfort with low or nil energy consumption. Passive cooling systems use non-mechanical methods to sustain a comfortable indoor temperature and are a main aim in extenuating the impact of buildings on the regional environment. The energy consumption in buildings is very much with the anticipation to further increase because of improving standards of leaving and the increase of industrialization. The use of HVAC in building has exponentially rises over the past few decades and quite enough to contribute in the enormous use of high grade electrical energy consumption. This paper reviews various passive cooling techniques used in the green building and their role in providing thermal comfort and its significance in energy conservation with the help of architectural interventions.

scholarly journals Selection and Assessment of Passive Cooling Techniques for Residential Buildings in Oman Using a Bioclimatic Approach

2013 ◽  
Vol 10 (2) ◽  
pp. 52 ◽  
Author(s):  
N Al-Azri ◽  
YH Zurigat ◽  
N Al-Rawahi
Keyword(s):  
Residential Buildings ◽  
Meteorological Data ◽  
Building Design ◽  
Passive Cooling ◽  
Viable Option ◽  
Cooling Systems ◽  
Bioclimatic Variables ◽  
Passive Cooling Systems ◽  
Selection And Assessment ◽  
Psychrometric Chart

 Passive cooling is an ancient technique used in air reconditioning and ventilation. Despite its historical use, its relevance in building design has never ceased. To be sure, with the increasing interest in saving energy and preserving the environment, passive cooling stands out as a sustainable possibility. However, this is not always a viable option, and its practicality is determined mainly by the system's functionality, the type of activities involved in the space to be cooled, and the surrounding area's bioclimatic variables (i.e. temperature, humidity, and diurnal temperature differences). In areas under consideration for passive cooling systems, bioclimatic charts are helpful. Comprehensive charts, in which yearlong hourly meteorological data are projected on a psychrometric chart, help to determine the fits required by a particular location. In this paper, psychrometric charts were developed for eight locations in Oman, and a systematic procedure on the selection and viability of using passive cooling techniques is provided through meteorological data. Givoni's passive cooling zones are used and the applicability of each technique is quantified. The eight study locations are widely scattered around and Oman, and possess great geographical diversity. The presented results can help delineate the applicability of each passive cooling technique for residential buildings at each of the study locations and their proximities. 

scholarly journals Measuring and Tracking Externalized Work to Support Industrialized Construction

2016 ◽  
Author(s):  
Perry Daneshgari ◽  
Heather Moore ◽  
Hisham Said
Keyword(s):  
Tacit Knowledge ◽  
Performance Outcomes ◽  
The Novel ◽  
Construction Operations ◽  
Planning And Control ◽  
Expected Performance ◽  
Control Framework ◽  
Novel Concept ◽  
And Control ◽  
The Impact

The same principles that have made other skilled-trade-based industries more efficient are being deployed in construction through Industrialization, which requires understanding skilled trade work and segregating/externalizing the work from the jobsite. The construction industry still relies heavily on skilled trades and their tacit knowledge, while most of the information available at the points of installation is not passed on. A significant increase of work externalization requires a measuring and tracking method that can: 1) tap into this tacit knowledge as the basis for work planning and control; and 2) understand, quantify, and minimize the manipulation effort done onsite for the prefabricated assemblies. As such, this paper presents a planning and control framework for industrialized construction operations that integrates information entropy and the novel concept of work manipulations to monitor and measure the expected performance outcomes, in a more sophisticated approach beyond measuring äóìhoursäó� and äóìquantitiesäó� of the work. The development of the proposed framework is based on the analysis of a set of case studies that illustrate the impact of information predictability manipulation strategies on construction prefabrication decisions.

A novel concept to produce periodic varied structural composite yarn via cyclical changing of the spacing between filaments and the strand

2018 ◽  
Vol 89 (15) ◽  
pp. 2998-3006 ◽  
Author(s):  
Zhigang Xia ◽  
Jiandong Tang ◽  
Wenxiang Ye
Keyword(s):  
Mechanical Analysis ◽  
The Novel ◽  
Geometrical Analysis ◽  
Cross Sectional ◽  
Composite Yarn ◽  
Structural Composite ◽  
Formation Zone ◽  
Yarn Structure ◽  
Novel Concept ◽  
Periodic Changes

In this study, a novel concept has been developed as a cyclical spacing-change method to produce periodic varied structural composite yarn. Geometrical analysis indicated that the cyclical change of spacing between filaments and the strand altered the yarn formation zone shapes from corefil to sirofil, causing cyclic yarn structure variations from the hairy core–sheath (corefil section) to the smooth spiral filament wrapping (sirofil section). A mechanical analysis revealed the corefil section with more twists was thinner than the sirofil section with fewer twists. Specifically, the cross-sectional diameter performed gradual periodic changes from the thick sirofil section to the thin corefil section. Then, an eccentric godet wheel device was used to conduct confirmatory experiments. Besides validating the theoretical analysis, the experimental results also showed that the novel concept yarn had the minimum hairiness and medium irregularity and strength after comparisons with sirofil and corefil yarns.

scholarly journals Development of Bioclimatic Design Tool for Oman Using Dry Bulb and Dew Point Temperatures Open Database

2017 ◽  
Vol 14 (2) ◽  
pp. 137
Author(s):  
Nasser Al-Azri ◽  
Y. Zurigat ◽  
N. Al-Rawahi
Keyword(s):  
Air Conditioning ◽  
Meteorological Data ◽  
Design Tool ◽  
Dew Point ◽  
Passive Cooling ◽  
Cooling Systems ◽  
Bioclimatic Design ◽  
Passive Cooling Systems

Bioclimatic charts are used by engineers and architects in implementing passive cooling systems and architectural optimization with respect to natural air conditioning. Conventionally, the development of these charts is based on the availability of typical meteorological year which requires a record of meteorological data that are rarely available in sufficient amounts. Bioclimatic charts in Oman were developed earlier by the authors for limited locations based on the available typical meteorological years. Using dry bulb and dew point temperatures only, bioclimatic charts are developed for Adam, Buraimi, Ibra, Muscat, Nizwa, Rustaq, Saiq, Salalah, Suhar and Sur. These charts are better representative of bioclimatic trends since their development is mainly based on the relevant parameters, namely dry bulb temperature and dew point.

scholarly journals When social practices produce space and create passive cooling systems in hot arid region

2022 ◽  
Vol 27 ◽  
pp. 932-944
Author(s):  
Ibtissame Benoudjafer
Keyword(s):  
Thermal Comfort ◽  
Arid Regions ◽  
Passive Cooling ◽  
Thermal Mass ◽  
Cooling Load ◽  
Cooling Systems ◽  
Cooling Strategy ◽  
Main Factors ◽  
Dry Climates ◽  
Passive Cooling Systems

Abstract. Practice social of people is the key to produce space and give a possibility to maintain thermal comfort and energy efficiency. The main objective of this research is to adapt the traditional strategies in the architecture actual, to achieved a thermal comfort and improve on reducing cooling load through the using of vernacular gait. Today, it is necessary to practice these systems in the current or conventional architecture of household. The study is especially for arid cities namely the region of Saoura, in the hot and dry climatic zone in Algeria, considered for this study. Two main factors is considered such as design and urban where taken into account in order to select the appropriate and specific passive cooling strategy. The results show that the passive cooling strategy of courtyard would be appropriate for arid regions, however a high thermal mass would be suitable for construction. In conclusion, this work made it possible to choose a suitable passive cooling strategy for all types of construction in hot and dry climates. Finally, this paper puts forward a set of recommendations to improve the passive design of future buildings in hot and arid climates.  

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