Wet bulb globe temperature - Revision history

Designing Buildings at 07:08, 11 November 2020

2020-11-11T07:08:42Z

← Older revision		Revision as of 07:08, 11 November 2020
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	* BS EN 27243:1994, ISO 7243 [http://shop.bsigroup.com/ProductDetail/?pid=000000000000321450 Hot environments. Estimation of the heat stress on working man, based on the WBGT-index (wet bulb globe temperature)].		* BS EN 27243:1994, ISO 7243 [http://shop.bsigroup.com/ProductDetail/?pid=000000000000321450 Hot environments. Estimation of the heat stress on working man, based on the WBGT-index (wet bulb globe temperature)].

−	[[Category:~~Standards_/_measurements~~]] [[Category:DCN_Standard]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Standard]] [[Category:Standards_/_measurements]]

Designing Buildings at 08:46, 18 December 2015

2015-12-18T08:46:18Z

← Older revision		Revision as of 08:46, 18 December 2015
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−
	The Health and Safety Executive (HSE) suggest that wet bulb globe temperature WBGT (or the wet bulb globe temperature index) can be used to indicate the likelihood of heat stress.		The Health and Safety Executive (HSE) suggest that wet bulb globe temperature WBGT (or the wet bulb globe temperature index) can be used to indicate the likelihood of heat stress.

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	The Workplace Regulations, the Management of Health and Safety at Work Regulations 1999 require that employers assess the risks to the health and safety of their workers, and take action where necessary and reasonably practicable.		The Workplace Regulations, the Management of Health and Safety at Work Regulations 1999 require that employers assess the risks to the health and safety of their workers, and take action where necessary and reasonably practicable.

−	Wet bulb globe temperature is a relatively simple indicator of heat stress. It includes components of natural wet-bulb temperature (~~t<sub>nw</sub>~~), globe temperature (~~t<sub>g</sub>~~) and air temperature (~~t<sub>a~~ - dry bulb temperature~~</sub>~~).	+	Wet bulb globe temperature is a relatively simple indicator of heat stress. It includes components of natural wet-bulb temperature (tnw), globe temperature (tg) and air temperature (ta - dry bulb temperature).
−	*Where there is no solar radiation, wet bulb globe temperature = 0.7tnw + 0.3tg	+
−	*Where there is solar radiation, wet bulb globe temperature = 0.7tnw +0.2tg +0.1ta	+	* Where there is no solar radiation, wet bulb globe temperature = 0.7tnw + 0.3tg
		+	* Where there is solar radiation, wet bulb globe temperature = 0.7tnw +0.2tg +0.1ta

	The recorded values can be compared to recommended values for a specific metabolic rate and state of acclimatisation (found in BS EN 27243:1994, ISO 7243 [http://shop.bsigroup.com/ProductDetail/?pid=000000000000321450 Hot environments. Estimation of the heat stress on working man, based on the WBGT-index (wet bulb globe temperature)]).		The recorded values can be compared to recommended values for a specific metabolic rate and state of acclimatisation (found in BS EN 27243:1994, ISO 7243 [http://shop.bsigroup.com/ProductDetail/?pid=000000000000321450 Hot environments. Estimation of the heat stress on working man, based on the WBGT-index (wet bulb globe temperature)]).
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	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
−	*Dry bulb temperature.~~<br/>~~	+
−	*Globe temperature.	+	* Dry bulb temperature.
−	*Heat stress.	+	* Globe temperature.
−	*Operative temperature.	+	* Heat stress.
−	*Relative humidity.	+	* Operative temperature.
−	*Temperature.	+	* Relative humidity.
−	*Thermal comfort.	+	* Temperature.
−	*Wet bulb temperature.	+	* Thermal comfort.
		+	* Wet bulb temperature.

	=== External references ===		=== External references ===
−	*HSE, [http://www.hse.gov.uk/temperature/heatstress/index.htm Heat stress].
−	*HSE, [http://www.hse.gov.uk/temperature/heatstress/measuring/wetbulb.htm Wet bulb globe temperature index].
−	*BS EN 27243:1994, ISO 7243 [http://shop.bsigroup.com/ProductDetail/?pid=000000000000321450 Hot environments. Estimation of the heat stress on working man, based on the WBGT-index (wet bulb globe temperature)].

−	[[Category:Standards_/_measurements]]	+	* HSE, [http://www.hse.gov.uk/temperature/heatstress/index.htm Heat stress].
		+	* BS EN 27243:1994, ISO 7243 [http://shop.bsigroup.com/ProductDetail/?pid=000000000000321450 Hot environments. Estimation of the heat stress on working man, based on the WBGT-index (wet bulb globe temperature)].
		+
		+	[[Category:Standards_/_measurements]] [[Category:DCN_Standard]]

Designing Buildings at 15:30, 8 July 2014

2014-07-08T15:30:18Z

← Older revision		Revision as of 15:30, 8 July 2014
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	*BS EN 27243:1994, ISO 7243 [http://shop.bsigroup.com/ProductDetail/?pid=000000000000321450 Hot environments. Estimation of the heat stress on working man, based on the WBGT-index (wet bulb globe temperature)].		*BS EN 27243:1994, ISO 7243 [http://shop.bsigroup.com/ProductDetail/?pid=000000000000321450 Hot environments. Estimation of the heat stress on working man, based on the WBGT-index (wet bulb globe temperature)].

−	[[Category:~~Theory~~]]	+	[[Category:Standards_/_measurements]]

Designing Buildings at 08:33, 27 January 2014

2014-01-27T08:33:18Z

← Older revision		Revision as of 08:33, 27 January 2014
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	The Workplace Regulations, the Management of Health and Safety at Work Regulations 1999 require that employers assess the risks to the health and safety of their workers, and take action where necessary and reasonably practicable.		The Workplace Regulations, the Management of Health and Safety at Work Regulations 1999 require that employers assess the risks to the health and safety of their workers, and take action where necessary and reasonably practicable.

−	Wet bulb globe temperature is a relatively simple indicator of heat stress. It includes components of natural wet-bulb temperature (t<sub>nw</sub>), globe temperature (t<sub>g</sub>) and air temperature (t<sub>a</sub>).	+	Wet bulb globe temperature is a relatively simple indicator of heat stress. It includes components of natural wet-bulb temperature (t<sub>nw</sub>), globe temperature (t<sub>g</sub>) and air temperature (t<sub>a - dry bulb temperature</sub>).
	*Where there is no solar radiation, wet bulb globe temperature = 0.7tnw + 0.3tg		*Where there is no solar radiation, wet bulb globe temperature = 0.7tnw + 0.3tg
	*Where there is solar radiation, wet bulb globe temperature = 0.7tnw +0.2tg +0.1ta		*Where there is solar radiation, wet bulb globe temperature = 0.7tnw +0.2tg +0.1ta
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	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
		+	*Dry bulb temperature.<br/>
		+	*Globe temperature.
	*Heat stress.		*Heat stress.
	*Operative temperature.		*Operative temperature.
		+	*Relative humidity.
	*Temperature.		*Temperature.
	*Thermal comfort.		*Thermal comfort.
		+	*Wet bulb temperature.

	=== External references ===		=== External references ===

Designing Buildings at 10:45, 24 January 2014

2014-01-24T10:45:48Z

← Older revision		Revision as of 10:45, 24 January 2014
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−	The Health and Safety Executive (HSE) suggest that wet bulb globe temperature WBGT (or wet bulb globe temperature index) can be used to indicate the likelihood of heat stress.	+	The Health and Safety Executive (HSE) suggest that wet bulb globe temperature WBGT (or the wet bulb globe temperature index) can be used to indicate the likelihood of heat stress.

−	Heat stress is a form of overheating that the occupants of a building may experience when the measures ~~that~~ their bodies use to regulate internal temperature begin to fail. This can occur for example in buildings where an industrial process is being carried out, such as smelting, brick-firing, cooking and so on.	+	Heat stress is a form of overheating that the occupants of a building may experience when the measures their bodies use to regulate internal temperature begin to fail. This can occur, for example, in buildings where an industrial process is being carried out, such as smelting, brick-firing, cooking and so on.

−	Heat stress is dependent on a number of factors, such as air temperature, metabolic rate, humidity, clothing, length of exposure, acclimatisation and so on. This means that it is a personal condition. Some occupants may experience heat stress whilst others may not.	+	Heat stress is dependent on a number of factors, such as air temperature, metabolic rate, humidity, clothing, length of exposure, acclimatisation and so on. This means that it is a personal condition. Some occupants may experience heat stress whilst others may not.

−	Where humidity is high, or occupants are wearing protective clothing that cannot be adjusted or removed, the body may be unable to lose heat through the evaporation of sweat and so the individual may begin to experience elevated deep-body temperature, excessive sweating and increased heart rate. This can cause; dehydration, headache, difficulty concentrating ~~and~~ confusion, muscle cramp, heat rash, fatigue, giddiness ~~and~~ fainting, nausea, convulsions and ultimately, if it is allowed to persist, death.	+	Where humidity is high, or occupants are wearing protective clothing that cannot be adjusted or removed, the body may be unable to lose heat through the evaporation of sweat and so the individual may begin to experience elevated deep-body temperature, excessive sweating and increased heart rate. This can cause; dehydration, headache, difficulty concentrating, confusion, muscle cramp, heat rash, fatigue, giddiness, fainting, nausea, convulsions and ultimately, if it is allowed to persist, death.

	The Workplace Regulations, the Management of Health and Safety at Work Regulations 1999 require that employers assess the risks to the health and safety of their workers, and take action where necessary and reasonably practicable.		The Workplace Regulations, the Management of Health and Safety at Work Regulations 1999 require that employers assess the risks to the health and safety of their workers, and take action where necessary and reasonably practicable.
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	The recorded values can be compared to recommended values for a specific metabolic rate and state of acclimatisation (found in BS EN 27243:1994, ISO 7243 [http://shop.bsigroup.com/ProductDetail/?pid=000000000000321450 Hot environments. Estimation of the heat stress on working man, based on the WBGT-index (wet bulb globe temperature)]).		The recorded values can be compared to recommended values for a specific metabolic rate and state of acclimatisation (found in BS EN 27243:1994, ISO 7243 [http://shop.bsigroup.com/ProductDetail/?pid=000000000000321450 Hot environments. Estimation of the heat stress on working man, based on the WBGT-index (wet bulb globe temperature)]).

−	However, this will only provide an indication of whether heat stress is likely. Wet bulb globe temperature is a compromise, offering a measure that is relatively simple to assess, whilst still recording the key components of heat stress. Where the ~~reccomended~~ values are exceeded, a more accurate measure such as Required Sweat Rate (also found in BS EN 12515) should be used for further assessment.	+	However, this will only provide an indication of whether heat stress is likely. Wet bulb globe temperature is a compromise, offering a measure that is relatively simple to assess, whilst still recording the key components of heat stress. Where the recomended values are exceeded, a more accurate measure such as Required Sweat Rate (also found in BS EN 12515) should be used for further assessment.

−	= Find out more =	+	= Find out more =

	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===

Designing Buildings: Created page with " The Health and Safety Executive (HSE) suggest that wet bulb globe temperature WBGT (or wet bulb globe temperature index) can be used to indicate the likelihood of heat stress. ..."

2014-01-24T10:38:28Z

Created page with " The Health and Safety Executive (HSE) suggest that wet bulb globe temperature WBGT (or wet bulb globe temperature index) can be used to indicate the likelihood of heat stress. ..."

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The Health and Safety Executive (HSE) suggest that wet bulb globe temperature WBGT (or wet bulb globe temperature index) can be used to indicate the likelihood of heat stress.

Heat stress is a form of overheating that the occupants of a building may experience when the measures that their bodies use to regulate internal temperature begin to fail. This can occur for example in buildings where an industrial process is being carried out, such as smelting, brick-firing, cooking and so on.

Heat stress is dependent on a number of factors, such as air temperature, metabolic rate, humidity, clothing, length of exposure, acclimatisation and so on. This means that it is a personal condition. Some occupants may experience heat stress whilst others may not.

Where humidity is high, or occupants are wearing protective clothing that cannot be adjusted or removed, the body may be unable to lose heat through the evaporation of sweat and so the individual may begin to experience elevated deep-body temperature, excessive sweating and increased heart rate. This can cause; dehydration, headache, difficulty concentrating and confusion, muscle cramp, heat rash, fatigue, giddiness and fainting, nausea, convulsions and ultimately, if it is allowed to persist, death.

The Workplace Regulations, the Management of Health and Safety at Work Regulations 1999 require that employers assess the risks to the health and safety of their workers, and take action where necessary and reasonably practicable.

Wet bulb globe temperature is a relatively simple indicator of heat stress. It includes components of natural wet-bulb temperature (tnw), globe temperature (tg) and air temperature (ta).
*Where there is no solar radiation, wet bulb globe temperature = 0.7tnw + 0.3tg
*Where there is solar radiation, wet bulb globe temperature = 0.7tnw +0.2tg +0.1ta

The recorded values can be compared to recommended values for a specific metabolic rate and state of acclimatisation (found in BS EN 27243:1994, ISO 7243 [http://shop.bsigroup.com/ProductDetail/?pid=000000000000321450 Hot environments. Estimation of the heat stress on working man, based on the WBGT-index (wet bulb globe temperature)]).

However, this will only provide an indication of whether heat stress is likely. Wet bulb globe temperature is a compromise, offering a measure that is relatively simple to assess, whilst still recording the key components of heat stress. Where the reccomended values are exceeded, a more accurate measure such as Required Sweat Rate (also found in BS EN 12515) should be used for further assessment.

= Find out more =

=== Related articles on Designing Buildings Wiki ===
*Heat stress.
*Operative temperature.
*Temperature.
*Thermal comfort.

=== External references ===
*HSE, [http://www.hse.gov.uk/temperature/heatstress/index.htm Heat stress].
*HSE, [http://www.hse.gov.uk/temperature/heatstress/measuring/wetbulb.htm Wet bulb globe temperature index].
*BS EN 27243:1994, ISO 7243 [http://shop.bsigroup.com/ProductDetail/?pid=000000000000321450 Hot environments. Estimation of the heat stress on working man, based on the WBGT-index (wet bulb globe temperature)].

[[Category:Theory]]