Globe temperature - Revision history

Designing Buildings at 07:54, 16 September 2020

2020-09-16T07:54:28Z

← Older revision		Revision as of 07:54, 16 September 2020
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	* Wet-bulb temperature.		* Wet-bulb temperature.

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

101.12.163.244 at 08:19, 12 May 2019

2019-05-12T08:19:23Z

← Older revision		Revision as of 08:19, 12 May 2019
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	The globe thermometer was introduced by Vernon in 1930 as a means of assessing the combined effects of radiation, air temperature and air velocity on human comfort.		The globe thermometer was introduced by Vernon in 1930 as a means of assessing the combined effects of radiation, air temperature and air velocity on human comfort.

−	It consists of a hollow copper sphere painted matt ~~back~~ to absorb radiant heat, with a temperature sensor at its centre. When it reaches a steady state (after 15 minutes or so depending on the size of the globe and the environmental conditions) the heat exchanges by convection and radiation will be in equilibrium, and the temperature recorded by the sensor will be somewhere between the air and radiant temperature. This is referred to as the globe temperature (tg) or black globe temperature and resembles the thermal conditions felt by the human body.	+	It consists of a hollow copper sphere painted matt black to absorb radiant heat, with a temperature sensor at its centre. When it reaches a steady state (after 15 minutes or so depending on the size of the globe and the environmental conditions) the heat exchanges by convection and radiation will be in equilibrium, and the temperature recorded by the sensor will be somewhere between the air and radiant temperature. This is referred to as the globe temperature (tg) or black globe temperature and resembles the thermal conditions felt by the human body.

	The standard sphere has a diameter of 150 mm. Other sizes do exist, but the smaller the diameter of the globe, the greater the effect of convection on the temperature recorded.		The standard sphere has a diameter of 150 mm. Other sizes do exist, but the smaller the diameter of the globe, the greater the effect of convection on the temperature recorded.
Line 33:		Line 33:
	* Wet-bulb temperature.		* Wet-bulb temperature.

−	[[Category:Standards_/_measurements]]	+	[[Category:Standards_/_measurements]] [[Category:DCN_Standard]]

Designing Buildings at 06:33, 23 November 2016

2016-11-23T06:33:21Z

← Older revision		Revision as of 06:33, 23 November 2016
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	From the temperature recorded, the mean radiant temperature (mrt) in can be calculated:		From the temperature recorded, the mean radiant temperature (mrt) in can be calculated:

−	MRT = tg + 2.42 x air velocity in cm/s (globe temperature – air temperature)	+	MRT = tg + 2.42 x air velocity in m/s (globe temperature – air temperature)

−	(equation ref [http://www.novalynx.com/manuals/210-4417-manual.pdf Novalynx Corporation] 2010 - this equation is dependent on the size and emissivity of the globe thermometer)	+	(equation ref [http://www.novalynx.com/manuals/210-4417-manual.pdf Novalynx Corporation] 2010 - this equation is dependent on the size and emissivity of the globe thermometer, and the units they show for air velocity are incorrect - cm/s, rather than the correct m/s shown above)

	Mean radiant temperature is a measure of the average temperature of the surfaces surrounding a body.		Mean radiant temperature is a measure of the average temperature of the surfaces surrounding a body.

Editor at 11:03, 4 December 2015

2015-12-04T11:03:44Z

← Older revision		Revision as of 11:03, 4 December 2015
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−
	The globe thermometer was introduced by Vernon in 1930 as a means of assessing the combined effects of radiation, air temperature and air velocity on human comfort.		The globe thermometer was introduced by Vernon in 1930 as a means of assessing the combined effects of radiation, air temperature and air velocity on human comfort.

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	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
−	*Condensation	+
−	*Dry-bulb temperature.	+	* Climate change science.
−	*Emissivity.	+	* Condensation
−	*Humidity.	+	* Dry-bulb temperature.
−	*Mean radiant temperature.	+	* Emissivity.
−	*Operative temperature.	+	* Humidity.
−	*Predicted mean vote.	+	* Mean radiant temperature.
−	*Psychometric chart.	+	* Operative temperature.
−	*Running mean temperature.	+	* Predicted mean vote.
−	*Sling psychrometer.	+	* Psychometric chart.
−	*Thermal comfort.	+	* Running mean temperature.
−	*Thermal indices.	+	* Sling psychrometer.
−	*Temperature.	+	* Thermal comfort.
−	*Wet-bulb temperature.	+	* Thermal indices.
		+	* Temperature.
		+	* Wet-bulb temperature.

	[[Category:Standards_/_measurements]]		[[Category:Standards_/_measurements]]

Designing Buildings at 08:11, 25 August 2014

2014-08-25T08:11:46Z

← Older revision		Revision as of 08:11, 25 August 2014
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	*Wet-bulb temperature.		*Wet-bulb temperature.

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

Designing Buildings at 11:12, 10 January 2014

2014-01-10T11:12:46Z

← Older revision		Revision as of 11:12, 10 January 2014
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	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
		+	*Condensation
	*Dry-bulb temperature.		*Dry-bulb temperature.
	*Emissivity.		*Emissivity.
		+	*Humidity.
		+	*Mean radiant temperature.
		+	*Operative temperature.
		+	*Predicted mean vote.
		+	*Psychometric chart.
		+	*Running mean temperature.
		+	*Sling psychrometer.
	*Thermal comfort.		*Thermal comfort.
	*Thermal indices.		*Thermal indices.
		+	*Temperature.
	*Wet-bulb temperature.		*Wet-bulb temperature.

	[[Category:Sustainability]]		[[Category:Sustainability]]
	[[Category:Theory]]		[[Category:Theory]]

Designing Buildings: Created page with " The globe thermometer was introduced by Vernon in 1930 as a means of assessing the combined effects of radiation, air temperature and air velocity on human comfort. It consists..."

2014-01-06T13:36:10Z

Created page with " The globe thermometer was introduced by Vernon in 1930 as a means of assessing the combined effects of radiation, air temperature and air velocity on human comfort. It consists..."

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The globe thermometer was introduced by Vernon in 1930 as a means of assessing the combined effects of radiation, air temperature and air velocity on human comfort.

It consists of a hollow copper sphere painted matt back to absorb radiant heat, with a temperature sensor at its centre. When it reaches a steady state (after 15 minutes or so depending on the size of the globe and the environmental conditions) the heat exchanges by convection and radiation will be in equilibrium, and the temperature recorded by the sensor will be somewhere between the air and radiant temperature. This is referred to as the globe temperature (tg) or black globe temperature and resembles the thermal conditions felt by the human body.

The standard sphere has a diameter of 150 mm. Other sizes do exist, but the smaller the diameter of the globe, the greater the effect of convection on the temperature recorded.

From the temperature recorded, the mean radiant temperature (mrt) in can be calculated:

MRT = tg + 2.42 x air velocity in cm/s (globe temperature – air temperature)

(equation ref [http://www.novalynx.com/manuals/210-4417-manual.pdf Novalynx Corporation] 2010 - this equation is dependent on the size and emissivity of the globe thermometer)

Mean radiant temperature is a measure of the average temperature of the surfaces surrounding a body.

= Find out more =

=== Related articles on Designing Buildings Wiki ===
*Dry-bulb temperature.
*Emissivity.
*Thermal comfort.
*Thermal indices.
*Wet-bulb temperature.

[[Category:Sustainability]]
[[Category:Theory]]