scholarly journals Influence of Passive Techniques on Thermal Performance of Building in Moderate Zone

2020 ◽  
Vol 9 (3) ◽  
pp. 360-364
Keyword(s):  
Life Cycle ◽  
Real Time ◽  
Thermal Performance ◽  
Building Material ◽  
Simulation Tools ◽  
Save Energy ◽  
Building Designs ◽  
Passive Techniques

Solar passive technologies need to be integrated in Building Designs. This helps not only save energy but also decreases stress and strains in building due to thermal disturbances. The main objective is to achieve comfort for utility for life cycle of the building. Passive techniques are main remedies to increase the building comfort hours without any use of artificial resources. This paper shows the thermal performance of building by simulating different passive techniques before constructing a new building and examines the possible changes that can have influence on comfort inside. A project of proposed building in moderate zone in India at latitude 16.69N and Longitude 74.23E is further examined for manifestations in real time using appropriate simulation tools. The study finalizes that for project under moderate zone, maximum discomfort hours are in summer. Applying the passive techniques to decrease the discomfort hours will finally increase the thermal performance of the building. For Moderate zone, implementation of passive techniques with changes in building material, orientations, air exchanges etc. decrease the discomforts to 9.4% which is 823 hours in a year

scholarly journals A New Conceptual Model for Adiabatic Fog

2021 ◽  
Author(s):  
Felipe Toledo ◽  
Martial Haeffelin ◽  
Eivind Wærsted ◽  
Jean-Charles Dupont
Keyword(s):  
Life Cycle ◽  
Conceptual Model ◽  
Real Time ◽  
Liquid Water ◽  
Critical Value ◽  
Liquid Water Path ◽  
Horizontal Visibility ◽  
Fog Water ◽  
Water Path ◽  
The Way

Abstract. We propose a new paradigm to describe the temporal evolution of continental fog layers. This paradigm defines fog as a layer saturated from the surface to a known upper boundary, and whose liquid water path (LWP) exceeds a critical value, the critical liquid water path (CLWP). When the LWP is less than the CLWP the fog water cannot extend all the way to the surface, leading to a surface horizontal visibility greater than 1 km. On the opposite, when the LWP is larger than the CLWP, the fog water extends all the way to the surface, inducing a horizontal visibility less than 1 km. The excess water with respect to the critical value is then defined as the reservoir liquid water path (RLWP). The new fog paradigm is formulated as a conceptual model that relates the liquid water path of adiabatic fog with its thickness and surface liquid water content, and allows the critical and reservoir liquid water paths to be computed. Both variables can be tracked in real time using vertical profiling measurements, enabling a real time diagnostic of fog status. The conceptual model is tested using data from seven years of measurements performed at the SIRTA observatory, combining cloud radar, microwave radiometer, ceilometer, scatterometer and weather station measurements. In this time period we found 80 fog events with reliable measurements, with 56 of these lasting more than three hours. The paper presents the conceptual model and its capability to derive the LWP from the fog CTH and surface horizontal visibility with an RMS uncertainty of 10.5 g m−2. The impact of fog liquid water path and fog top height variations on fog life cycle (formation to dissipation) is presented based on four case studies, and statistics derived from 56 fog events. Our results show in particular that the reservoir liquid water path is consistently positive during the mature phase of the fog and that it starts to decrease quasi monotonously about one hour before dissipation, reaching a near-zero value at the time of dissipation. The reservoir liquid water path and its time derivative could hence be used as an indicator for life cycle stage and support short range forecasting of fog dissipation.

scholarly journals Systematic Simplified Simulation Methodology for Deep Energy Retrofitting Towards Nze Targets Using Life Cycle Energy Assessment

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3038 ◽  
Author(s):  
José Sánchez Ramos ◽  
MCarmen Guerrero Delgado ◽  
Servando Álvarez Domínguez ◽  
José Luis Molina Félix ◽  
Francisco José Sánchez de la Flor ◽  
...  
Keyword(s):  
Life Cycle ◽  
Energy Consumption ◽  
Energy Savings ◽  
Residential Building ◽  
Energy Performance ◽  
Simulation Tools ◽  
Energy Assessment ◽  
Energy Efficiency Improvement ◽  
The Difference ◽  
Reduction Of Energy Consumption

The reduction of energy consumption in the residential sector presents substantial potential through the implementation of energy efficiency improvement measures. Current trends involve the use of simulation tools which obtain the buildings’ energy performance to support the development of possible solutions to help reduce energy consumption. However, simulation tools demand considerable amounts of data regarding the buildings’ geometry, construction, and frequency of use. Additionally, the measured values tend to be different from the estimated values obtained with the use of energy simulation programs, an issue known as the ‘performance gap’. The proposed methodology provides a solution for both of the aforementioned problems, since the amount of data needed is considerably reduced and the results are calibrated using measured values. This new approach allows to find an optimal retrofitting project by life cycle energy assessment, in terms of cost and energy savings, for individual buildings as well as several blocks of buildings. Furthermore, the potential for implementation of the methodology is proven by obtaining a comprehensive energy rehabilitation plan for a residential building. The developed methodology provides highly accurate estimates of energy savings, directly linked to the buildings’ real energy needs, reducing the difference between the consumption measured and the predictions.

Study on Product Life-Cycle Genetic Engineering Theory

2007 ◽  
Author(s):  
Kezheng Huang
Keyword(s):  
Life Cycle ◽  
Genetic Engineering ◽  
Real Time ◽  
Product Life Cycle ◽  
Life Cycle Management ◽  
Product Life ◽  
Engineering Theory ◽  
Conceptual Design Phase ◽  
Physical Form ◽  
Plm System

Widespread IT application leads up to the idea of integrating all the information related with products. It is the ultimate goal to design a product creatively and automatically acquiring all the updated information through close interaction with Product Life-cycle Management (PLM) system starting from conceptual design phase. In this paper, Product Genetic Engineering (PGE) concept for innovative design automation is introduced, and extended to Product Life-Cycle Genetic Engineering (PLCGE) which has genes for downstream processes and can interact with all the real-time information through PLM, and so provides real-time support for PGE decision-making. A basic framework for PLCGE is proposed in which the product development can be divided into two main phases: the generation of product “genome” and the growth of the “genome” into its physical form. In the former phase, the product genome originates from and serves as an extension to human genome, and forms a complete genome through design process dealing with life-cycle factors. In the latter phase, the product genome acquires “protein” to grow inside its mother body (the factory), and PLM system acts as an “umbilical cord” between the product genome and its mother body. Finally, a case study of PLCGE application in Mass Customization is made for validity of PLCGE.

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