There shouldn't be any real issues with paralleling the power supplies, especially if they're the same series.
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Getting custom cables made is more of a PITA to parallel things than you probably think it is though. It really is just easier to toss two PSUs in there.
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Similarly, there's a huge difference in price and lead time with choosing the stock radiator dimensions that all the closed loop cooler vendors are using vs getting your own thinner and deeper one made. I really don't see an issue with their design, ...
Yeah agreed on all points. Of course it has all been stated upthread but certain people are just here to troll.
though I don't know why they don't just mount the intake for the PSUs on the inside and then exhaust through the back in typical fashion. Room temperature air has a typical heat capacity of ~34J/(ft^3*K) and a little manipulation gives ~1.75 °C*(ft^3/min)/W. Even if there were dumping 1200W into the case, it would only take ~200cfm to keep the air inside the case 10°C warmer than the outside air. That's well within the operating parameters of any half decent PSU.
crumbs was under the belief that using warmed cased air would somehow cause power supplies to fail. It was pointed out they are DESIGNED to be used that way but facts tend to not work when people don't want to know.
Regarding the orientation of the PSU. It is possible they can be flipped. For non-rackmount conditions (or single open side rack) as pictured is optimal. In datacenter environment flipping the PSU 180 deg would intake from the case and exhaust out the back (to hot aisle).
Like you I see nothing "wrong" with HashFast design. It is a compromise between optimal design and speed of poduction. Could one use high density server PSU (straight through airflow vs 90 deg in ATX style), a very high capacity back mounted radiator, custom pump, custom reservoir, custom wiring harness which results in perfect front to back airflow? Of course they could. It also quintupled the number of suppliers, the number of assembly steps and the number of potential places which can cause delays or failures.
Sometimes "realistically good" design using off the shelf components beats ridiculously optimized custom solution especially when production time is so sensitive. Still it would be nice if HashFast can comment/clarify on the PSU orientation. Despite what was stated off thread I highly doubt that the PSU are custom designed for reverse airflow. It would be pointless, expensive, and time consuming. Hashfast went out their way to use off the shelf components for everything else. To then use some pointlessly expensive reverse airflow PSU makes absolutely no sense. It has never been stated by Hashfast, it is almost certainly not correct but it explicitly clarified I am sure a certain troll will spam another 100 posts about it.