Well, this wont be a freeze ray, but may have a similar effect to what your looking for. Lets take a spherical object floating in a room without an atmosphere (neglecting conduction and convection). The object is at thermal equilibrium with its surroundings at let say 293K and the conduction of the material is >>> than its size (allows for the use of the Lumped Capacitance Method if you wanted to do this with real numbers and allows for a final object temperature to be determined in this very high level gedanken). Now would introduce a blackbody near the object where the entrance of the blackbody takes us a certain solid angle of the object's view. If the solid angle was 2pi, aka half of the object sees a room at 293K and the other half sees the blackbody, then the object would eventually reach a new equilibrium temperature of 146.5K.
