Field Evaluation of Protective Clothing Effects on Fire Fighter Physiology: Predictive Capability of Total Heat Loss Test

2008 ◽  
pp. 481-481-23 ◽  
Author(s):  
JO Stull ◽  
RM Duffy
Keyword(s):  
Heat Loss ◽  
Protective Clothing ◽  
Field Evaluation ◽  
Total Heat ◽  
Fire Fighter ◽  
Predictive Capability ◽  
Total Heat Loss

Evaluation of Functional Underwear for Firefighter Clothing by Total Heat Loss

2013 ◽  
Vol 796 ◽  
pp. 617-622 ◽  
Author(s):  
Kaoru Wakatsuki ◽  
Hajime Tsuji ◽  
Takehiro Kato ◽  
Yoshio Ogawa
Keyword(s):  
Heat Loss ◽  
Moisture Transfer ◽  
Thermal Protection ◽  
Total Heat ◽  
Fire Fighter ◽  
Positive Contribution ◽  
Total Heat Loss ◽  
And Function ◽  
In Fire ◽  
Heat And Moisture

Synthetic textile such as polyester and poly-urethane has been used for underwear in terms of moisture release and function in underwear. However, the synthetic underwear has high risk for skin burns due to melting and shrinking by heat. Thermal protection and comfort in fire fighter protective clothing is always trading off, but fire fighters tend to use the synthetic underwear to feel comfort and function during firefighting operation without understanding of the risk for skin burns by the textile. Objective of this study is to investigate if the synthetic underwear plays a significant role in moisture and metabolic heat transfer within the fire fighter clothing by total heat loss measurement. Measurement of the total heat loss has been conducted by the ASTM F-1868 instrument (Kato-Tech, Co. Ltd., Japan). Three type of fire fighter clothing, one station wear, and five types of underwear have been used for the test. Test has been conducted for each clothing and combination of clothing. The results shows that range of total heat loss is 322.3 W/m2 to 385.3 W/m2, 857.9 W/m2, 782.3 W/m2 to 897.3 W/m2 for three fire fighter clothing, one station wear and five underwear, respectively. However, when the fabrics of fire fighter clothing, station wear and underwear were piled up, the range of total heat loss decreased to 242.1 W/m2 to 304.4 W/m2. The data indicates that the fire fighter's multi-layer fabric controls the heat and moisture transfer within fire fighter clothing and no positive contribution by any types of underwear.

scholarly journals Critical WBGT for 4 protective clothing made of fabrics with different Total Heat Loss values

2015 ◽  
Vol 4 (S1) ◽  
Author(s):  
Aitor Coca ◽  
Jung-Hyun Kim ◽  
Candi Ashley ◽  
Thomas Bernard
Keyword(s):  
Heat Loss ◽  
Protective Clothing ◽  
Total Heat ◽  
Total Heat Loss

scholarly journals Total Heat Loss of Firefighters’ Protective Clothing

2015 ◽  
Vol 61 (1) ◽  
pp. 13-16
Author(s):  
Hajime TSUJI ◽  
Toshio MATSUOKA
Keyword(s):  
Heat Loss ◽  
Protective Clothing ◽  
Total Heat ◽  
Total Heat Loss

Cavity receiver thermal performance analysis based on total heat loss coefficient and efficiency factor

2018 ◽  
Vol 42 (6) ◽  
pp. 2284-2289 ◽  
Author(s):  
Qiangqiang Zhang ◽  
Xin Li ◽  
Zhifeng Wang ◽  
Zhi Li ◽  
Hong Liu ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Heat Loss ◽  
Thermal Performance ◽  
Efficiency Factor ◽  
Loss Coefficient ◽  
Total Heat ◽  
Total Heat Loss

scholarly journals Fitness-related differences in the rate of whole-body total heat loss in exercising young healthy women are heat-load dependent

2018 ◽  
Vol 103 (3) ◽  
pp. 312-317 ◽  
Author(s):  
Dallon T. Lamarche ◽  
Sean R. Notley ◽  
Martin P. Poirier ◽  
Glen P. Kenny
Keyword(s):  
Heat Loss ◽  
Heat Load ◽  
Total Heat ◽  
Whole Body ◽  
Total Heat Loss ◽  
Healthy Women

scholarly journals Heat loss analysis of three coil cylindrical solar cavity receiver of parabolic dish for process heat

2019 ◽  
Vol 23 (Suppl. 4) ◽  
pp. 1301-1310
Author(s):  
Ramola Sinha ◽  
Nitin Gulhane ◽  
Jan Taler ◽  
Pawel Oclon
Keyword(s):  
Cost Effectiveness ◽  
Heat Loss ◽  
Total Heat ◽  
Fluid Temperature ◽  
Total Heat Loss ◽  
Wall Area ◽  
Single Coil ◽  
Receiver System ◽  
Parabolic Dish ◽  
Process Heat

The share of solar thermal energy for process heat at sub cooled temperature is estimated about 30% of the total demand. The assessment of heat loss from tubular receiver used for the process heat is necessary to improve the thermal efficiency and consequently the cost effectiveness of the parabolic dish receiver system. The study considers a modified three coil solar cavity receiver of wall area three times (approximately) as compared to the existing single coil receiver and experimentally investigates the effect of increases in cavity inner wall area, fluid inlet temperature (50-75?C), and cavity inclination angle (? = 0-90?) on the combined (total) heat loss from receiver under no wind condition. This paper also develops an analytical model to estimate the different mode of heat losses from the downward facing receiver. In the mean fluid temperature range of 50?C to 70?C, the total heat loss from three coil receiver is reduced up to 40.98% at 90? and 20% at 0? inclination, as compared to single coil receiver. The analytical modeling estimates very low heat loss from conduction (1-3%) and radiation (2-8%) and high heat loss from convection (97-89%). The heat loss by natural convection decreases sharply with increase in cavity inclination, while the heat loss by radiation and conduction increases slowly with inclination. A three coil cavity receiver might be considered in the design to reduce heat loss from parabolic dish receiver system to improve the thermal performance and cost effectiveness.

A Comparative Numerical Study on Conjugate Natural Convection From Vertical Hollow Cylinder With Finite Thickness Placed on Ground and in Air

2020 ◽  
Vol 13 (2) ◽  
Author(s):  
Manoj Kumar Dash ◽  
Sukanta Kumar Dash
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Natural Convection ◽  
Heat Loss ◽  
Hollow Cylinder ◽  
Average Nusselt Number ◽  
Total Heat ◽  
Outer Diameter ◽  
Thermal Plume ◽  
Total Heat Loss

Abstract The present work reports a comparative analysis of natural convection heat transfer from a thick hollow vertical cylinder either placed on the ground or suspended in the air. The numerical simulations have been performed by varying the cylinder length to its outer diameter (L/Do) in the range of 0.2–20, the thickness ratio (Di/Do) in a range of 0.5–0.9, and Rayleigh number (Ra) from 104 to 108. The flow and heat transfer characteristics have been delineated precisely with the presentation of the thermal plume and flow field in the vicinity of the cylinder. The variation of average Nusselt number (Nu), local Nu, and contribution to total heat loss from different surfaces with the pertinent parameters have been elucidated graphically. The average Nu is always more for the cylinder in the air compared with the case when it is on the ground. However, the difference between the Nu for these two cases diminishes, as the L/Do increases. It has also been found that the contribution to total heat loss from the inner surface of the hollow cylinder suspended in air increases with L/Do, attains a peak, and decreases sharply. Cooling time curves for the cylinder placed in air or on the ground have been described precisely. Finally, a correlation for the average Nusselt number as a function of all the pertinent parameters has been proposed that can be useful for industrial and academic purposes.

Sign in / Sign up

Export Citation Format

Share Document