Given two radiators of identical design, an aluminum one would cool (transfer heat) better than brass, since the thermal conductivity of aluminum is better than brass.
You sir are sadly mistaken on the conducitivity of aluminum and cooper and brass for heat and electricity
BTW, electrical conductivity and thermal conductivity are two entirely different properties of materials.
Thermal conductivity for common materials and products:
Thermal Conductivity
- k -
W/(m K)
Material/Substance Temperature - oC
25 125 225
Acetals 0.23
Acetone 0.16
Acetylene (gas) 0.018
Acrylic 0.2
Air, atmosphere (gas) 0.024
Air, elevation 10000 m 0.020
Alcohol 0.17
Aluminum 205 215 250
Aluminum Brass 121
Aluminum Oxide 30
Ammonia (gas) 0.022
Antimony 18.5
Apple (85.6% moisture) 0.39
Argon (gas) 0.016
Asbestos-cement board 0.744
Asbestos-cement sheets 0.166
Asbestos-cement 2.07
Asbestos, loosely packed 0.15
Asbestos mill board 0.14
Asphalt 0.75
Balsa wood 0.048
Bitumen 0.17
Bitumen/felt layers 0.5
Beef, lean (78.9 % moisture) 0.43 - 0.48
Benzene 0.16
Beryllium 218
Bitumen 0.17
Blast furnace gas (gas) 0.02
Brass 109
