PURPOSE: A natural circulation radiator is provided to use a Coanda effect and an boarding effect for various radiators to obtain a radiation effect according to natural air circulation. CONSTITUTION: A heat sink(110) absorbs heat. A radiator panel(120) radiates heat accumulated in the heat sink. A natural circulation structure of heat radiation comprises a Coanda inducing shade(130) The natural circulation structure of heat radiation use a Coanda effect and a boarding effect for the heated air space residing on the periphery of the radiator panel to be circulated with the external cold air space.
