[HarryP]

The effect of acid on cooling requirements goes like this: the acid raises to density. So a gallon of anodiser will weigh more than a gallon of water. A 10% by volume bath will a specific gravity of about 1.1. However the specific heat will reduce by a similar amount. So the the energy required to raise/lower the temperature will be the same as for an equal volume of water.

In addition to the heating from the electrical energy, chemical energy is produced by the conversion of aluminium to it's oxide. This generally amounts to about 10% of the electrical energy.

Most of the energy, electrical and chemical, is dissipated in the anodic film. To get good quality anodizing it is necessary to use agitation to remove the heat from the surface. Otherwise you may get a coating produced at an apparent 68 degrees have the properties of a film produced at 80 degrees or more (which it has been).