Resultant clothing insulation: a function of body movement, posture, wind, clothing fit and ensemble thickness

Havenith, George; Heus, Ronald; Lotens, W.A.

doi:10.1080/00140139008927094

Cited by 180 publications

(154 citation statements)

References 9 publications

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“…, measured on the same human participants using heat balance technique (Havenith et al 1990) were used, differing only in the type of outer cover or manner of use. In experiment one six conditions of outer cover were used (vapour resistances of covers (R cover ) measured according to Vanbeest & Wittgen (1986) …”

Section: Sleeping Bagsmentioning

confidence: 99%

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Moisture accumulation in sleeping bags at − 7°C and − 20°C in relation to cover material and method of use

Havenith

Hartog²,

Heus

2004

Ergonomics

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Moisture accumulation in sleeping bags during extended periods of use is detrimental to thermal comfort of the sleeper, and in extreme cases may lead to sleep loss and hypothermia. As sub-zero temperatures were expected to affect vapour resistance of microporous membranes, the effect of using semipermeable and impermeable rain covers for sleeping bags on the accumulation of moisture in the bags during six days of use at -7 and five days at -20 ºC were investigated. In addition, the routine of shaking off hoarfrost from the inside of the cover after the sleep period as a preventive measure for moisture accumulation was studied. Moisture accumulation (ranging from 92 to 800 grams) was found to be related to the vapour resistance of the materials used. The best semipermeable material gave the same moisture build-up as no cover at -7ºC, though build-up increased substantially at -20ºC. Shaking off the hoarfrost from the inside of the cover after each use was beneficial in preventing a high moisture build-up. It was concluded that semipermeable cover materials reduce moisture accumulation in sleeping bags at moderate sub-zero temperatures, but in more extreme cold (-20ºC) the benefits are reduced in comparison to routinely shaking frost from impermeable covers. Compared to fixed impermeable covers, the benefits of all semipermeable covers are large. For long-term use without drying facilities, the differences observed do favour the semi-permeable covers above impermeable ones, even when regularly removing the hoar frost from the inside in the latter.

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Section: Sleeping Bagsmentioning

confidence: 99%

“…Twice during each session, metabolic rate was determined by measurement of oxygen uptake (Havenith et al 1990). …”

mentioning

confidence: 99%

Moisture accumulation in sleeping bags at − 7°C and − 20°C in relation to cover material and method of use

Havenith

Hartog²,

Heus

2004

Ergonomics

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“…[3][4][5][6][7] Considerable work has been carried out for studying the impacts of wind and garment apertures on garment TI and VR. [3][4][5][8][9][10][11] Havenith et al studied the effects of wind on ventilation and found that wind impacted clothing ventilation significantly. 3,4 And later Havenith et.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5][8][9][10][11] Havenith et al studied the effects of wind on ventilation and found that wind impacted clothing ventilation significantly. 3,4 And later Havenith et. al.…”

Section: Introductionmentioning

confidence: 99%

Effects of wind and clothing apertures on local clothing ventilation rates and thermal insulation

Kong

Havenith

Zhang

et al. 2013

Textile Research Journal

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The purpose of this study was to investigate the effects of wind (0 m/s, 1.1 m/s) and clothing apertures (no close, close hem, close hem and neck) and the combined effects of them on local clothing ventilation rates and localized thermal insulation. Nine working jackets with identical design but different garment sizes and fabric permeability were made. The results showed that wind and clothing apertures had distinct effects both on the local ventilation rates and the local thermal insulation. The local ventilation rates of the right arm were largest at 1.1 m/s wind speed with clothing hem closed. Chest and back ventilation rates were higher at wind than at no wind.Closing garment hem affected the local thermal insulation of the impermeable garments mostly.Except for wind and garment apertures, garment sizes and fabric permeability also impacted the local ventilation rates and the thermal insulation.

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“…Prilikom lateralne kompresije materijala smanjuje se zapremina inkorporiranog vazduha što sigurno menja toplotni fluks kroz materijal [94,99,117,134]. Pored toga, trajne promene u strukturi materijala izazvane kompresionim silama definitivno menjaju njegove termičke karakteristike [84]. Zbog toga su termičko ponašanje i kompresibilnost tekstilnih materijala u tesnoj vezi.…”

Section: Termička Svojstva Tekstilnih Materijalaunclassified

Influence of agro-cellulose fibre based yarn structure on subsequent textile transformation and end-use properties

Stanković¹

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Tekstilno tržište se poslednjih decenija odlikuje širokom zastupljenošću sintetičkih vlakana, pre svega zbog jeftinije i produktivnije proizvodnje. Pored ekonomskih razloga, tome doprinosi i činjenica da prisustvo sintetičkih vlakana u odevnom tekstilnom materijalu poboljšava stabilnost dimenzija i trajnost i olakšava negu i održavanje odevnih predmeta. Međutim, povećani zahtevi za komfornom odećom, kao i ekološki prihvatljivim tekstilnim vlaknima, izazvali su porast proizvodnje i primene prirodnih vlakana. Proizvodnja i primena vlakana konoplje odlikuje se naglim usponima i padovima, počev od perioda intenzivnog gajenja pa do gotovo potpunog prekida poslednjih decenija. Jedinstvena svojstva i ekološke prednosti vlakana konoplje reafirmišu ih za primenu u oblasti tkz. "zdravog" odevnog tekstila. Specifična tekstilna svojstva konoplje, kao što su odlična higijenska, toplotna, električna i UV zaštitna svojstva, svrstavaju tekstilne materijale od konoplje u grupu tekstila sa dobrim fiziološkim predispozicijama. Ipak, izvesne slabosti vlakana konoplje, koja se vezuju za tvrdi opip i malu elastičnost, predstavljaju ograničenja sa aspekta taktilnog komfora i dalje tekstilne transformacije. Da bi bi se konoplja uvela u oblast visoko kvalitetnog komfornog odevnog tekstila, u kojoj sada dominiraju pamuk, viskoza i vuna, neophodno je da se svojstva vlakana konoplje modifikuju i usklade sa svojstvima tradicionalnih komfornih vlakana (pamuk, viskoza i vuna). Aktuelna istraživanja se bave mogućnostima upotrebe vlakana konoplje, modifikovanih specijalnim metodama elementarizacije (kotonizovanje), u mešavinama sa pamukom, vunom ili sintetičkim vlaknima, kako bi se upotrebom sistema predenja pamuka ili vune proizvele visoko kvalitetne pređe. Cilj ovog istraživanja bio je ispitivanje mogućnosti dobijanja komfornih tekstilnih materijala mešanjem vlakana konoplje sa drugim vlaknima dubliranjem ili končanjem homogenih pređa. Primenjene tehnike kombinovanja jednožičnih pređa omogućile su ne samo kombinovanje vlakana različitih svojstava, već i dobijanje kompleksnih pređa čija su se svojstva, usled promena u gustini pakovanja i orijentaciji vlakana, razlikovala od svojstava jednožičnih komponenata. Končanjem jednožičnih pređa različitog sirovinskog sastava i strukture dobijene su hibridne pređe jedinstvenih svojstava.Radi ispitivanja uticaja strukture pređe na svojstva komfora, od dubliranih pređa od konoplje, viskozne i tri različito upredene varijante pamučnih pređa, pri čemu su sve imale istu nominalnu finoću, proizvedeno je devet varijanti DL pletenina. Deseta varijanta pletenine izrađena je od končane dvožične pređe od konoplje. Od končanih pređa na bazi konoplje proizvedene su dve serije DD (1×1) pletenina, koje su se odlikovale manjom (N) i većom (V) gustinom petlji. Ispitivana su mehanička, relaksaciona i površinska svojstva pređa za koja se očekivalo da mogu imati uticaja na komfor pletenina, kao i fizička svojstva pletenina koja su u najvećoj meri odgovorna za percepciju komfora. Sposobnost pletenina da prenose toplotu, vaz...

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Resultant clothing insulation: a function of body movement, posture, wind, clothing fit and ensemble thickness

Cited by 180 publications

References 9 publications

Moisture accumulation in sleeping bags at − 7°C and − 20°C in relation to cover material and method of use

Moisture accumulation in sleeping bags at − 7°C and − 20°C in relation to cover material and method of use

Effects of wind and clothing apertures on local clothing ventilation rates and thermal insulation

Influence of agro-cellulose fibre based yarn structure on subsequent textile transformation and end-use properties

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