rMBP 15' 650m Fan goes constantly when in clamshell

[Macforcollege]

When i power my 24' Asus monitor with my Rmbp 15' the fans go constantly. All i am running is a few applications. Nothing that requires a lot of energy.

 

[Freyqq]

cooling is not as efficient when the lid is closed

 

[FrozenDarkness]

i think they do get fresh air from the keyboard