scholarly journals A new approach to resolving climate-cryosphere relations: Downscaling climate dynamics to glacier-scale mass and energy balance without statistical scale linking

2011 ◽  
Vol 116 (D16) ◽  
Author(s):  
Thomas Mölg ◽  
Georg Kaser
Keyword(s):  
Energy Balance ◽  
Climate Dynamics ◽  
New Approach ◽  
Scale Linking

Dehydration of Ethanol: New Approach Gives Positive Energy Balance

Science ◽  
1979 ◽  
Vol 205 (4409) ◽  
pp. 898-900 ◽  
Author(s):  
M. R. LADISCH ◽  
K. DYCK
Keyword(s):  
Energy Balance ◽  
Positive Energy ◽  
New Approach ◽  
Positive Energy Balance

New Approach for Analyzing Solar Collectors Subjected to Unequal Front/Rear Ambient Temperatures: The Equivalent Ambient Temperature Concept, Part 1: Modeling

2002 ◽  
Vol 124 (3) ◽  
pp. 262-267 ◽  
Author(s):  
Kam T. K. Ho ◽  
Dennis L. Loveday
Keyword(s):  
Energy Balance ◽  
Ambient Temperature ◽  
Solar Collector ◽  
Heat Removal ◽  
Efficiency Factor ◽  
Standard Analysis ◽  
New Approach ◽  
Ambient Temperatures ◽  
Overall Heat Loss Coefficient ◽  
Temperature Concept

Standard analyses of solar collector thermal performance are based upon an energy balance in which the environments adjoining the front and rear of the collector are assumed to be at the same temperature. This assumption is inappropriate for some collector designs, particularly building-integrated collectors. An approach for analyzing such situations is presented based upon a new conceptual temperature termed the “equivalent ambient temperature.” The concept is explained, the new temperature is defined, and the approach is applied to a typical collector geometry. The approach retains the convenience of the standard analysis while accounting for the unequal front/rear ambient temperatures and permits collector characterization in terms of the conventional parameters: plate efficiency factor, F′; heat removal factor, FR; overall heat loss coefficient, UL, and effective transmittance–absorptance product, ταe.

Towards an Appropriate Modeling of Energy Balance in Molecular Dynamics Simulations of Confined Lubrication Films

2008 ◽  
Author(s):  
H. Berro ◽  
N. Fillot ◽  
P. Vergne
Keyword(s):  
Thin Films ◽  
Molecular Dynamics ◽  
Energy Balance ◽  
Kinetic Energy ◽  
Energy Loss ◽  
Molecular Dynamics Simulations ◽  
Thermal Agitation ◽  
New Approach ◽  
Energetic Approach ◽  
Dynamics Simulations

We propose a new approach to the study of friction in molecularly thin films. The instantaneous occurrence of both momentum and thermal kinetic energy diffusions in the film requires a sophisticated energetic approach. This can be done by identifying the energetic terms which are due to thermal agitation or shearing rather than globally thermostating the system. With this approach, it becomes possible to quantify the energy loss due to friction and to describe the local mechanisms of its dissipation inside the liquid and through the interfaces. Implemented, the method can give more accurate results in molecular dynamics simulations of confined films.

scholarly journals Energy Design and Optimization of a Greenhouse: A Heating, Cooling and Lighting Study

2019 ◽  
Vol 9 (3) ◽  
pp. 4235-4242 ◽  
Author(s):  
A. Belkadi ◽  
D. Mezghani ◽  
A. Mami
Keyword(s):  
Energy Consumption ◽  
Energy Balance ◽  
Crop Production ◽  
Classical Model ◽  
New Approach ◽  
Profound Impact ◽  
Design And Optimization ◽  
Heat Released

This paper presents a new approach to properly optimize the energy consumption in a greenhouse. An improved intermediate modeling to establish the energy balance in a greenhouse within a higher precision was adopted. While the classical model focuses on the efficient cooling and heating demands and neglects the profound impact of lighting parameters, it was shown that these three necessary components are interdependent, and they should be taken into account all together to comfortably reach optimal crop production and energy consumption. This study’s contribution is the classical model’s improvement and the demonstration of the fact that the heat released by the luminaries and the energy used by this equipment has fundamental consequences on the energy balance as well as the preferred choice of the possible shape of the greenhouse and its adequate cover.

On the Solution of Transcendental Eigenvalue Problem in Transmission Line Bundled Conductors

2004 ◽  
Author(s):  
Himanshu Verma ◽  
Ashish M. Dighe ◽  
Peter Hagedorn
Keyword(s):  
Energy Balance ◽  
Eigenvalue Problem ◽  
Transmission Line ◽  
Transmission Lines ◽  
Input Data ◽  
Natural Frequencies ◽  
Standard Form ◽  
Electrical Transmission ◽  
Energy Balance Method ◽  
New Approach

Overhead electrical transmission lines are always susceptible to aeolian vibrations, caused by light to moderate winds. Spacer dampers are used in bundled transmission lines to keep the conductors at required minimum spacing and to suppress the wind induced vibrations. Mathematical models are necessary for the computation of the conductor vibrations for studying the efficiency of damping measures. The so called energy balance method gives good results for estimating the vortex excited vibrations of overhead electrical transmission lines. In its standard form it requires the knowledge of the eigenfunctions, which are routinely calculated for the single conductor lines. However, the problem becomes more involved in the case of bundled conductors with spacer dampers due to very dense spectrum of the natural frequencies. In the present paper some approaches towards solving the transcendental eigenvalue problem (EVP) for the bundled conductors with spacer dampers are discussed. It is formulated as an algebraic transcendental EVP, which however presents several numerical difficulties. Reasons for these numerical difficulties are discussed in some detail. A new approach, named as “continuous spectrum approach,” provides better engineering solution for the transmission line bundled conductors. The solution of the EVP gives the necessary input data for applying the energy balance.

scholarly journals Dependence of PV Module Temperature on Incident Time-Dependent Solar Spectrum

2020 ◽  
Vol 10 (3) ◽  
pp. 914 ◽  
Author(s):  
Joseph Appelbaum ◽  
Tamir Maor
Keyword(s):  
Energy Balance ◽  
Balance Equation ◽  
Operating Temperature ◽  
Solar Spectrum ◽  
Cell Types ◽  
Energy Balance Equation ◽  
New Approach ◽  
New Model ◽  
Pv Module ◽  
Pv Modules

The operating temperature of photovoltaic (PV) modules affects the photovoltaic conversion process. The operating temperature depends on various environmental conditions and on material-dependent properties of the PV modules. Many expressions for the operating temperature have been proposed in the literatures, some are simplified working Equation as NOCT (Nominal Operating Cell Temperature), and others are more complex, being based on a combination of the energy balance Equation and NOCT. The present study offers a new approach (model) for determining the PV module temperature based on the energy balance Equation and on the solar spectrum irradiance. While using the new model, the operating temperature has been determined for four module technologies: c-Si, a-Si/ μ c-Si, CdTe, and CIGS and it shows that the operating temperatures for the different cell types are close to the manufacturers’ NOCT data-sheet temperatures. For c-Si technology, for example, the simulation resulted in 43.2° and 46° for the spectrum and NOCT models, respectively. The proposed new model offers a new approach for determining the operating temperature of PV modules.

Effects of Ambipolar Diffusion on Prominence Thread Models

1994 ◽  
Vol 144 ◽  
pp. 315-321 ◽  
Author(s):  
M. G. Rovira ◽  
J. M. Fontenla ◽  
J.-C. Vial ◽  
P. Gouttebroze
Keyword(s):  
Energy Balance ◽  
Transition Region ◽  
Ambipolar Diffusion ◽  
Line Profiles ◽  
Balance Equations ◽  
Model Calculations ◽  
Partial Frequency ◽  
Frequency Redistribution ◽  
Partial Frequency Redistribution ◽  
Theoretical Structure

AbstractWe have improved previous model calculations of the prominence-corona transition region including the effect of the ambipolar diffusion in the statistical equilibrium and energy balance equations. We show its influence on the different parameters that characterize the resulting prominence theoretical structure. We take into account the effect of the partial frequency redistribution (PRD) in the line profiles and total intensities calculations.

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