Design Temperatures 1

[SAK9]

Summer design temperatures in most countries are 24C where as typical winter design temperatures vary from 19~21 C.What is the reason for adopting different temperatures for summer and winter from a thermal comfort perspective?

 

[quark]

This is something to do with thermal neutrality, when maximum number of people neither feel cold nor hot. Interestingly, thermal neutrality depends upon the average outdoor dry bulb temperature.

For an excellent discussion on thermal comfort, go to

http://www.squ1.com

and go to Thermal Comfort submenu under Efficient Design menu.

Regards,

 

[friartuck]

Quite simply Sak9, in winter, it is more economic to heat to 19 than 23, and its also cheaper to cool to 24 rather than 19. (Also, 19 would feel very uncomfortable if you tried to cool down to it)

The 'legal' maximum in the UK is 19 (After the energy crisis in the seventies--the act I don't think was ever repealed----plus the fact that nobody ever takes any notice of it anyway)

There is no legal max temp (UK only)



Friar Tuck of Sherwood

 

[ub313]

The 2 reasons to keep winter design temperature low,
1. the difference in temperature between outdoor and indoor has to be kept to lowest practicable to avoid thermal shocks.Some standards like the Russian SNIP standards even suggest a max deltaT of 8 deg K(does not make sense when temp can be as low as -30Deg C)
2. The RH in winter is acceptable at 40% for winter, and to maintain RH at 40% even at a low temp of 18 Deg DB, the amount of humidification required and the related energy is of considerable magnitude, and if room design temp were to be higher the humidification load also increases tremendously'
UB313

 

[ASSADEQ]

in my opinon in winter, people wear heavy clothes. with design room temp. 19~21 they will feel more comfortable.