The Research of Warmth Retention Property of Non-Woven Wadding

2011 ◽  
Vol 197-198 ◽  
pp. 1708-1711
Author(s):  
Cheng Qian
Keyword(s):  
Heat Loss ◽  
Air Permeability ◽  
Loss Reduction ◽  
Warmth Retention

Nowadays in the market, there are many kinds of warm retention materials. Although each material has its own heat loss reduction, there should be methods for evaluating the warmth properties and giving out reliable results. In this paper, the warmth retention properties of three typical non-woven wadding were studied. On the basis of four warming related tests and analyses, the conclusions were got that after filming, because of existence of motionless air, their warmth retention properties increase obviously. In the same time, the air permeability of the three non-woven wadding decrease clearly because of the film on the wadding surface which obstructs air from flowing easily.

Optimization of heat loss reduction from the gas holder: Analytical study

1987 ◽  
Vol 27 (2) ◽  
pp. 127-131 ◽  
Author(s):  
G.N. Tiwari ◽  
Y.P. Yadav ◽  
A. Srivastava
Keyword(s):  
Heat Loss ◽  
Analytical Study ◽  
Loss Reduction

Study on Air Permeability and Warmth Retention Ability of Polyurethane Foam Plying with Fabrics

2017 ◽  
Vol 866 ◽  
pp. 233-239 ◽  
Author(s):  
Chi Wai Kan ◽  
Clare Man Ching Ko ◽  
Kittisak Ariyakuare ◽  
Wasana Changmuong ◽  
Rattanaphol Mongkholrattanasit
Keyword(s):  
Thermal Property ◽  
Polyurethane Foam ◽  
Air Permeability ◽  
Experimental Results ◽  
Retention Ratio ◽  
Warmth Retention

In this study, we evaluated warmth retention ability of polyurethane foam (non-laminated and laminated) plying with fabrics. The warmth retention ratio, measured by KES-F7, was used for expressing the thermal property of plied samples. Experimental results revealed that the warmth retention ratio of samples that were plied with fabrics were higher than the foams in plain (i.e. without plying with fabric). For non-laminated foams, the fabrics had generally increased the warmth retention ratio by 10%. For laminated foams, the increase was about 4 to 5% in the warm retention ratio. By comparing the warmth retention ratio between the non-laminated foams and laminated foams, laminated foams have higher heat retention power. Being a close-to-skin garment, the air permeability is an important factor to determine their usage. Thus, we examined the air permeability of the different samples and the results were discussed properly.

Heat loss reduction and hydrocarbon combustion in ultra-micro combustors for ultra-micro gas turbines

2009 ◽  
Vol 32 (2) ◽  
pp. 3067-3073 ◽  
Author(s):  
Takashi Sakurai ◽  
Saburo Yuasa ◽  
Taku Honda ◽  
Shoko Shimotori
Keyword(s):  
Heat Loss ◽  
Gas Turbines ◽  
Loss Reduction ◽  
Hydrocarbon Combustion

scholarly journals Efficiency of Different Balcony Slab Modernization Method in Retrofitted Multi-Family Buildings

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6666
Author(s):  
Beata Sadowska ◽  
Piotr Bieranowski
Keyword(s):  
Energy Efficiency ◽  
Heat Loss ◽  
Cost Effective ◽  
Economic Effects ◽  
Loss Reduction ◽  
Modern Material ◽  
Eu Directive ◽  
Surface Condensation ◽  
Large Panel ◽  
Thermal Bridges

Many buildings have considerable thermal bridges at the junction of balcony slabs with walls. To achieve the new EU directive targets related to energy efficiency, greater attention should be paid to such design details. This study analyzes the efficiency of traditional balcony slab modernization methods, the use of modern insulation materials and a new alternative system: an added self-supporting light balcony system (LKBD) in retrofitted large-panel buildings. The main objective was to capture cost-effective renovation methods from both the heat loss reduction perspectives and risk of surface condensation. The analyses, carried out in four buildings, have shown that at current costs, the thermal modernization of balconies is not economically efficient (SPBT>98.4 years). However, it is necessary because leaving the balcony slabs without insulation or only insulating them from the bottom carries the risk of surface condensation. The most cost-effective renovation method is to insulate the balcony slabs from below and above with the thickest possible XPS layer (SPBT = 98.4 years; 107.4 years). Replacing XPS with modern material increases SPBT by almost 50%, for the LKBD system, SPBT = 269.2–281.5 years. More favorable energy and economic effects related to the reduction of balcony thermal bridges were achieved in the wall with lower insulation.

scholarly journals Thermal Shields for Heat Loss Reduction in Siemens-Type CVD Reactors

2016 ◽  
Vol 5 (3) ◽  
pp. P172-P178 ◽  
Author(s):  
A. Ramos ◽  
J. Valdehita ◽  
J. C. Zamorano ◽  
C. del Cañizo
Keyword(s):  
Heat Loss ◽  
Loss Reduction ◽  
Thermal Shields

scholarly journals Comparative Study on the Effects of Laser Bleaching and Conventional Bleaching on the Physical Properties of Indigo Kapok/Cotton Denim Fabrics

2019 ◽  
Vol 9 (21) ◽  
pp. 4662 ◽  
Author(s):  
Wei Du ◽  
Danying Zuo ◽  
Houlei Gan ◽  
Changhai Yi
Keyword(s):  
Tensile Strength ◽  
Physical Properties ◽  
Potassium Permanganate ◽  
Air Permeability ◽  
Color Fastness ◽  
Kapok Fiber ◽  
Denim Fabric ◽  
Laser Bleaching ◽  
Warmth Retention ◽  
Recovery Angle

Kapok is a hollow fiber with a 90% hollow degree. Compared with cotton fiber, kapok fiber has excellent performances, such as good hygroscopicity, and a good warmth retention property. In this work, desized indigo kapok/cotton denim fabrics were bleached in different ways: Laser, cellulose enzyme, sodium hypochlorite, potassium permanganate and hydrogen peroxide. After bleaching, the K/S values, tensile strength, air permeability, thickness, color fastness to rubbing and the crease recovery angle of denim fabrics were measured through the spectrophotometer, tensile strength tester, air permeability tester, thickness tester, rubbing fastness tester and fabric crease elasticity tester, respectively. The surfaces of fabrics and fibers were observed by scanning electron microscopy (SEM). Results show that the kapok/cotton fabrics were color-faded after five kinds of bleaching, the K/S values of denim with laser bleaching was declined dramatically, while there was a little change in the permeability. The tensile strength and the weight of the fabrics were decreased, and cloth which was bleached with potassium permanganate was most affected. The color fastness to rubbing and the crease recovery angle of denim fabrics with laser treatment is most suitable for industrial production. In general, laser bleaching is the better way to fade the kapok/cotton denim fabrics. Meanwhile, after five kinds of bleaching, the physical properties of kapok/cotton denim fabrics were similar to those of cotton denim fabric, which indicates that kapok/cotton denim fabric is suitable for the existing industrial bleaching technology.

scholarly journals Protection against Cold in Prehospital Care: Evaporative Heat Loss Reduction by Wet Clothing Removal or the Addition of a Vapor Barrier—A Thermal Manikin Study

2012 ◽  
Vol 27 (1) ◽  
pp. 53-58 ◽  
Author(s):  
Otto Henriksson ◽  
Peter Lundgren ◽  
Kalev Kuklane ◽  
Ingvar Holmér ◽  
Peter Naredi ◽  
...  
Keyword(s):  
Heat Loss ◽  
Prehospital Care ◽  
Ambient Air ◽  
Total Heat ◽  
Thermal Manikin ◽  
Evaporative Heat Loss ◽  
Loss Reduction ◽  
Total Heat Loss ◽  
Cold Environments ◽  
Wet Heat

AbstractIntroduction: In the prehospital care of a cold and wet person, early application of adequate insulation is of utmost importance to reduce cold stress, limit body core cooling, and prevent deterioration of the patient’s condition. Most prehospital guidelines on protection against cold recommend the removal of wet clothing prior to insulation, and some also recommend the use of a waterproof vapor barrier to reduce evaporative heat loss. However, there is little scientific evidence of the effectiveness of these measures.Objective: Using a thermal manikin with wet clothing, this study was conducted to determine the effect of wet clothing removal or the addition of a vapor barrier on thermal insulation and evaporative heat loss using different amounts of insulation in both warm and cold ambient conditions.Methods: A thermal manikin dressed in wet clothing was set up in accordance with the European Standard for assessing requirements of sleeping bags, modified for wet heat loss determination, and the climatic chamber was set to -15 degrees Celsius (°C) for cold conditions and +10°C for warm conditions. Three different insulation ensembles, one, two or seven woollen blankets, were chosen to provide different levels of insulation. Five different test conditions were evaluated for all three levels of insulation ensembles: (1) dry underwear; (2) dry underwear with a vapor barrier; (3) wet underwear; (4) wet underwear with a vapor barrier; and (5) no underwear. Dry and wet heat loss and thermal resistance were determined from continuous monitoring of ambient air temperature, manikin surface temperature, heat flux and evaporative mass loss rate.Results: Independent of insulation thickness or ambient temperature, the removal of wet clothing or the addition of a vapor barrier resulted in a reduction in total heat loss of 19-42%. The absolute heat loss reduction was greater, however, and thus clinically more important in cold environments when little insulation is available. A similar reduction in total heat loss was also achieved by increasing the insulation from one to two blankets or from two to seven blankets.Conclusion: Wet clothing removal or the addition of a vapor barrier effectively reduced evaporative heat loss and might thus be of great importance in prehospital rescue scenarios in cold environments with limited insulation available, such as in mass-casualty situations or during protracted evacuations in harsh conditions.

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