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.
MRT = tg + 2.42 x air velocity in cm/s (globe temperature – air temperature)
 Related articles on Designing Buildings Wiki
Featured articles and news
The origins, evolution and future of Level 3 BIM.
For new and returning Urban Design students, check out our article list divided up into the modules you'll be studying.
Report states that health of urban dwellers could be significantly improved by rethinking transport design.
The Kremlin, the centre of Russian power, includes some of the country's finest architecture.
Report launched outlining steps for a national infrastructure system that is efficient, sustainable, and delivers until 2050.
A review of Justin Bere's concise and well-presented introductory guide to Passive House.
This article describes in detail the tender process for a typical commercial construction contract.
What is energy storage, what are the different types and what is its future?
MAD Architects reveal their designs for a state-of-the-art concert hall in Beijing.
Take a look at BIG's designs for two twisting towers in New York City.
'The filing cabinet' which was labelled one of the best British buildings of the 21st century.