[BrianH]

1. What is the heat load from the hot side?

Using Kryotherm with resonable value, the hot side would be around 120w.

2. What is the convective heat transfer coefficient for the flat surface of the block?

Not sure whay you mean here. If you are talking about the MCW50-T block, then direct TEC cooling would eliminate the heat transfers between the hot side/AS3/Copper base. Should be much more efficient overall???

3. Would adding a copper hot plate with furniture of some kind .......

I do believe in turbulance. I believe the design of MCW50-T would cause a lot of turbulance within the block. If not, perhaps a "turbulance generator" could be designed into the to of the block.

4. Clamping pressure

With diect TEC cooling, the clamping pressure on the hot side is no longer needed. The cold plate and the TEC with still need a large clamping force. Since the hot side would only be clamped along the edges (I assume??), then great clamping force on the cold side may be difficault to achieve.

I suspect that if you use a more powerful TEC, then it may become necessary to use a hot plate

Agreed!

I would also suspect that in this case, the performance would be LARGELY dependent on the flow rate,

As most cooling systems are. May be of more importance with the MCW50-T.

qwerty57

Are you still going to use the MCW40 block with 2 plates? If you have not purchased yet, I would consider the MCW50-T block. Others have reported good results, I believe. I think the direct TEC cooling will be the way of the future.