An Investigation of the Numerical Properties of the Surface Heat-Balance Equation

1973 ◽  
Vol 12 (6) ◽  
pp. 1069-1072 ◽  
Author(s):  
C. A. Jacobs ◽  
P. S. Brown
Keyword(s):  
Balance Equation ◽  
Heat Balance ◽  
Surface Heat ◽  
Heat Balance Equation

Study on the Flashover Criteria for Compartmental Fires

1997 ◽  
Vol 15 (2) ◽  
pp. 95-107 ◽  
Author(s):  
W.K. Chow
Keyword(s):  
Balance Equation ◽  
Heat Balance ◽  
Lower Layer ◽  
Heat Balance Equation ◽  
Zone Model ◽  
Heat Temperature ◽  
Fire Environment ◽  
Smoke Layer ◽  
Mass Flow Rates ◽  
The Heat Balance

Criteria on the possibility of having flashover in a compartment fire were reviewed. The heat balance equation in the compartment was studied. The zone model CFAST 2.0 was applied to study the fire environment in a small compartment with a door of different area. Important parameters including the average upper and lower layer temperature, the smoke layer interface height, and the mass flow rates for intake air and outgoing smoke were calculated. Those pre dicted results were substituted back to the heat balance equation for determining the possibility of having flashover. The analysis shows that it is possible to deter mine the likelihood for flashover by using a well-validated zone model. From the heat-temperature curves derived, effect of the sprinkler can also be studied.

Evapotranspiration Estimate by Heat Balance Equation

2005 ◽  
Author(s):  
Tadashi Takakura ◽  
Kotaro Takayama ◽  
Hiroshige Nishina ◽  
Kazuaki Tamura ◽  
and Shinji Muta
Keyword(s):  
Balance Equation ◽  
Heat Balance ◽  
Heat Balance Equation

scholarly journals The heat loss calculating methods of external walls in the buildings reconstruction

2018 ◽  
Vol 230 ◽  
pp. 02038 ◽  
Author(s):  
Varvara Vinnichenko ◽  
Azat Gabitov ◽  
Aleksandr Salov ◽  
Askar Gaisin ◽  
Dmitriy Kuznetsov
Keyword(s):  
Finite Element ◽  
Heat Conduction ◽  
Heat Loss ◽  
Balance Equation ◽  
Heat Balance ◽  
Operating Experience ◽  
Energy Performance ◽  
Heat Balance Equation ◽  
The Heat Balance ◽  
Window Frames

Heat loss analysis in cladding of brick buildings under reconstruction is presented. Thermograms obtained under thermovision inspection and window systems operating experience in conditions of the Republic of Bashkortostan are thoroughly studied. Live issue of increasing buildings energy performance in public utilities sector may largely be solved by replacement of existing window units made of wood to new PVC profile windows equipped with multi-glazed glass units both in brick and frame-panel old buildings. Significant heat loss occurs in junctions between the window frames and the wall in jamb areas. Therefore for the heat conduction matrix for the finite element is used the heat balance equation. Use of the software application to choose certain measures to eliminate the thermal bridges enables to get the thermotechnical calculations in the junction between the window and the exterior wall in the form of temperature fields. Practical recommendations for arrangement of heat insulation in junctions between the window frames and the wall to eliminate actual defects and for normal room conditions are made under examinations. To get the heat conduction matrix for the finite element we will use the heat balance equation.

A Computer Model of Glaze Accretion on Wires

1996 ◽  
Vol 118 (2) ◽  
pp. 148-157 ◽  
Author(s):  
G. Draganoiu ◽  
L. Lamarche ◽  
P. McComber
Keyword(s):  
Computer Model ◽  
Balance Equation ◽  
Heat Balance ◽  
Control Volume ◽  
Water Flux ◽  
Heat Balance Equation ◽  
Ice Accretion ◽  
Surface Geometry ◽  
Related Field ◽  
The Heat Balance

The design of power transmission lines requires a knowledge of combined wind and ice loading and of the dynamic behavior of wires loaded with ice accretion. The calculation of the wind forces, in turn, imposes a need for a more detailed computer model for determining glaze accretion shape. For this purpose, a computer model of glaze accretion on wires, was developed. It is based on experimental results in the area of ice accretion on wires, as well as on results in the related field of the glaze ice accretion on airfoils. The model incorporates the time dependent on feedback between the growing accretion and the air stream, the variation of the heat transfer coefficient around the cylinder, and the surface runback of water. The main components of the model are the computation of the air flow field, the computation of the impingement water at the control volume level, the solving of the heat balance equation, and the computation of the accretion shape on the wire. The surface air velocity is obtained through the solution of the potential flow around the iced wire and wake, followed by the integration on the surface of the laminar boundary layer. The water flux is computed in each control Volume down to the separation point. The heat balance equation derived from the energy equation is solved to determine the freezing fraction and the resulting modified ice surface geometry.

Infrared Biosensor Test System under Pulsed Bias Voltage

2013 ◽  
Vol 411-414 ◽  
pp. 1539-1545
Author(s):  
Jia Yin Zhang ◽  
Tao Dong ◽  
Kai Ying Wang ◽  
Yan Su ◽  
Yong He
Keyword(s):  
Bias Voltage ◽  
Balance Equation ◽  
Heat Balance ◽  
Test System ◽  
Heat Balance Equation ◽  
Small Scale ◽  
Usb Interface ◽  
Biosensor Array

Infrared biosensor has been a hot area of research for several years in infrared field. This paper proposes a method to test infrared biosensor array which is not bonding with ROIC. The presented ROIC-less infrared biosensor is encapsulated in a vacuum chip scale packaging, and we design the off-chip “ROIC” in order to read out signal of infrared biosensor. It is necessary to apply bias voltage on pixels when infrared biosensor works, we gave a simulation of infrared biosensor in pulsed bias votage mode according to the infrared biosensor heat balance equation. Based on the simulation result, we have implemented the test system for ROIC-less and small-scale infrared biosensor array. We use FPGA as main controller to readout the infrared signal and transfer the data to PC via USB interface.

scholarly journals Improvement of the Heat Balance Equation Accuracy, in the Case of Saturation Diving

2021 ◽  
Vol 15 (3) ◽  
pp. 318-322
Author(s):  
Anca Constantin ◽  
Tamara Stanciu
Keyword(s):  
Body Temperature ◽  
Balance Equation ◽  
Heat Balance ◽  
Good Accuracy ◽  
Absolute Humidity ◽  
The Body ◽  
Heat Balance Equation ◽  
The Absolute ◽  
The Heat Balance ◽  
Theoretical Results

The body temperature of a diver is one of the most important aspects of the concept of underwater safety and comfort. The heat balance equation previously established, was improved in this paper by introducing a linear dependence of the absolute humidity on the body temperature, as the absolute humidity influences the latent heat flux needed for the humidification of the breathing gas. The solution of the new proposed heat balance equation is a step forward in assessing the body temperature in both cases of unitary and saturation diving. The paper presents the equation and its solutions in the case of breathing either air or Heliox and compares the theoretical results with the values measured in the frame of simulated saturation diving with Heliox 5/95, in the hyperbaic laboratory. The proposed equation predicts the body temperature of the diver, at the end of a 30 minutes immersion with a good accuracy. The relative error is up to 1%.

Sign in / Sign up

Export Citation Format

Share Document