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Showing 3 results for Cooling Vest
Effect of Iranian cooling vests with phase change material packs on heat strain indices in hot/ humid conditions in Persian Gulf
Somayeh Gharebaei, Habibollah Dehghan , Behzad Mahaki, Firouz Valipour,
Volume 2, Issue 2 (9-2014)
Abstract
Abstract Background: Heat exposure is one of the harmful agents at work environments. Workers in high temperature environments are susceptible to heat strain. The purpose of this study was to evaluate the performance of Iranian cooling vests containing phase change material in hot and humid conditions in the Persian Gulf. Materials and Methods: This interventional study carried out on 6 subjects of oil tanker ship's engine room staff in summer in 2013. The Heat Strain Score Index (HSSI), oral temperature and blood pressure measured with and without the cooling vest wearing for two hours, and data were analyzed by paired t test. Results: The mean oral temperature were 36.98± 0.22 °C (without cooling vest) and were 36.68± 0.68°C (cooling vest) at 30th minutes in heat exposure. The mean oral temperature were 37.06± 0.25 °C (without cooling vest) and were 36.78± 0.16°C (cooling vest) at 60th minutes in heat exposure. (p <0.042) and also HSSI was 12.72 ±3.03 (without cooling vest) and 8.65 ±2.9 (with cooling vest) (p <0.039) but the mean systolic and diastolic blood pressure were not significant statistically with and without the use of cooling vests (p>0.05). Conclusion: Our findings showed that cooling vests with phase change material packs reducing heat strain (oral temperature and perceptual heat) in hot and humid climates in Persian Gulf
The design and manufacturing of phase change material cooling vests and their effectiveness in reducing thermal strain under laboratory conditions
Saeed Yazdani Rad, Habibollah Dehghan,
Volume 3, Issue 3 (12-2015)
Abstract

Introduction: Water and paraffin are well-known phase change materials used in the manufacturing of cooling vests. The present study was conducted to design and make a cooling vest using commercial paraffin compounds and ice and to then examine their effect on thermal strain parameters in hot climate conditions in a climate chamber.

Materials and Methods: A cooling vest was first made with polyester fabric and containing 17 aluminum packs. Each aluminum pack was filled with 72 g of water and 65 g of prepared paraffin. A total of 10 male students then performed a treadmill exercise in hot climate conditions in a climate chamber (ambient temperature (TA) = 40 0C and relative humidity (RH) = 40%) once with and once without wearing the cooling vest and at two levels of exercise intensity, including a light intensity (2.8 kph) and a moderate intensity (4.8 kph) exercise. Each stage of the experiment involved 30 minutes of rest and 30 minutes of exercise on the treadmill. Participants’ heart rate, oral and skin temperature and sweat rate were measured throughout the study.

Result: The latent heat of the prepared paraffin was 108 kJ/kg and the peak melting point was 30 °C. Significant differences were observed between participants’ mean heart rate, oral and skin temperature and sweat rate at both exercise intensities and both with and without the cooling vest (P<0.05).

Conclusion: The use of a cooling vest containing paraffin and ice can reduce thermal strain through reducing the heart rate, oral and skin temperature and sweat rate.


Performance of Vests based on Nanofibers and Packages of Phase Change Materials to Reduce Thermal Stress in a Hot Work Environment: An Experimental Study
Ali Davoodizadeh, Mohsen Aliabadi, Majid Habibi Mohraz, Maryam Farhadian, Masoud Shafiee Motlagh,
Volume 11, Issue 2 (9-2023)
Abstract
Objectives: This study aimed to investigate the effectiveness of cooling vests based on nanofibers and packages of phase change materials (PCM) in reducing the thermal stress of medical personnel in hot workplaces.
Methods: In this experimental study, 20 males were exposed to 10 combined scenarios of temperatures of 24°C and 32°C in a room simulating atmospheric conditions and having 5 samples of cooling vests. Physiological parameters, including skin surface temperature, tympanic temperature, and oral temperature were measured before and after exposure to air temperature conditions by simulating the activity metabolism of hospital workers. The normal distribution of the data was checked with the Kolmogorov-Smirnov test, and the analysis of the effect of the scenarios was performed through the analysis of variance with repeated measurements.
Results: The results confirmed that in the condition without a vest, the air temperature of 32°C compared to the air temperature of 24°C had a greater effect in increasing the tympanic body temperature (P<0.05). The significant effect of using nanofiber vests along with PCM packages was observed in reducing skin temperature, tympanic temperature, and oral temperature in hot temperature conditions with effect sizes of 0.498, 0.568, and 0.349, respectively (P<0.05). The effect size of increasing the air temperature was lower than that of the type of cooling vests on the physiological responses, indicating that the effectiveness of the designed vests is enhanced with an increase in temperature (P<0.05).
Conclusion: The use of nanofiber cooling vests and PCM packages is effective in maintaining the body temperature stability of medical personnel in hot environments due to ideal weight and acceptable effect size.

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