scholarly journals Estimation of metabolic heat input for refuge alternative thermal testing and simulation

2018 ◽  
Vol 70 (8) ◽  
pp. 50-54 ◽  
Author(s):  
T.E. Bernard ◽  
D.S. Yantek ◽  
E.D. Thimons
Keyword(s):  
Heat Input ◽  
Thermal Testing ◽  
Metabolic Heat

Influence of Respiratory Heat Transfer on Thermogenesis and Heat Storage after Cold Immersion

1982 ◽  
Vol 63 (2) ◽  
pp. 127-135 ◽  
Author(s):  
J. B. Morrison ◽  
M. L. Conn ◽  
P. A. Hayes
Keyword(s):  
Heat Production ◽  
Heat Input ◽  
Heat Storage ◽  
Metabolic Heat Production ◽  
Central Temperature ◽  
The Core ◽  
Metabolic Heat ◽  
Male Subjects ◽  
Skin Temperatures ◽  
Cold Immersion

1. Ten male subjects were cooled on three occasions to a rectal temperature of 35°C by immersion to the neck in water at 11·3°C. The subjects were rewarmed for 60 min, once by metabolic heat production alone (shivering), once by inhalation rewarming with spontaneous breathing of saturated air at 47°C (control) and once by inhalation rewarming with ventilation regulated at 40 litres/min by respiring a controlled fraction of CO2 (hyperventilation). 2. Metabolic heat production was substantially reduced by inhalation rewarming (P < 0·05), from 913 kJ when shivering to 766 kJ (control) and 613 kJ when hyperventilating. The fall in metabolic heat production was greater than the corresponding respiratory heat gain, which increased from a loss of 41 kJ when shivering to gains of 85 kJ (control) and 169 kJ (hyperventilation). 3. As differences in mean skin temperatures were small (<1·0°C), it is concluded that the lower metabolic heat production in response to increased respiratory heat input must result from more rapid central temperature gains. This conclusion is supported by the relative values of rectal and tympanic temperatures. It was calculated that the percentage of the total heat supply which was donated to the core increased from 13% during shivering to 16% for the control and 23% in hyperventilation. Results imply that respiratory heat input is more efficient than metabolic heat production in elevating central temperature.

Effect of the Heat Input on the Tensile Properties in Arc Brazing of Ferritic Stainless Steel using Cu-Si Insert Alloy

2010 ◽  
Vol 48 (04) ◽  
pp. 289-296 ◽  
Author(s):  
Myung-Bok Kim ◽  
Sang-Ju Kim ◽  
Bong-Keun Lee ◽  
Xinjian Yuan ◽  
Byoung-Hyun Yoon ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Tensile Properties ◽  
Ferritic Stainless Steel ◽  
Heat Input

METABOLIC HEAT BALANCES IN WORKING MEN WEARING LIQUID-COOLED SEALED CLOTHING

1964 ◽  
Author(s):  
JEREMY CROCKER ◽  
PAUL WEBB ◽  
DAVID JENNINGS
Keyword(s):  
Metabolic Heat

Analysis of the variation of heat input in welded joints of API 5L-X70 Steel with pulsed Nd: YAG laser weld

2018 ◽  
Author(s):  
Willian Valicelli Sanitá ◽  
Vicente Afonso Ventrella ◽  
Juno Gallego
Keyword(s):  
Welded Joints ◽  
Heat Input ◽  
Laser Weld ◽  
Yag Laser ◽  
Api 5L X70 Steel

Experimental and Numerical Simulation for Thermal Investigation of Oscillating Heat Pipe Using VOF Model

2020 ◽  
Vol 38 (1A) ◽  
pp. 88-104
Author(s):  
Anwar S. Barrak ◽  
Ahmed A. M. Saleh ◽  
Zainab H. Naji
Keyword(s):  
Thermal Resistance ◽  
Heat Pipe ◽  
Heat Input ◽  
Cfd Simulation ◽  
Working Fluid ◽  
Maximum Deviation ◽  
Inlet Temperature ◽  
Maximum Heat ◽  
Oscillating Heat Pipe ◽  
Vof Model

This study is investigated the thermal performance of seven turns of the oscillating heat pipe (OHP) by an experimental investigation and CFD simulation. The OHP is designed and made from a copper tube with an inner diameter 3.5 mm and thickness 0.6 mm and the condenser, evaporator, and adiabatic lengths are 300, 300, and 210 mm respectively.  Water is used as a working fluid with a filling ratio of 50% of the total volume. The evaporator part is heated by hot air (35, 40, 45, and 50) oC with various face velocity (0.5, 1, and 1.5) m/s. The condenser section is cold by air at temperature 15 oC. The CFD simulation is done by using the volume of fluid (VOF) method to model two-phase flow by conjugating a user-defined function code (UDF) to the FLUENT code. Results showed that the maximum heat input is 107.75 W while the minimum heat is 13.75 W at air inlet temperature 35 oC with air velocity 0.5m/s. The thermal resistance decreased with increasing of heat input. The results were recorded minimum thermal resistance 0.2312 oC/W at 107.75 W and maximum thermal resistance 1.036 oC/W at 13.75W. In addition, the effective thermal conductivity increased due to increasing heat input.  The numerical results showed a good agreement with experimental results with a maximum deviation of 15%.

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