Peter
during discussions with one of my competitors, we discussed the merits of akv's. On large supermarkets there is an advantage, you could select your tev's on a low dp, but they would/maybe be inclinded to hunt at higher ambients. For a small job such as this I think the cost will out weigh the benifits. Larger cooler still require the same valve+controller, making the cost more attractive. On the other hand there maybe some grants available to ofsett the cost.
Better fit convensional tev's, with liquid pressure amplification, boosting the lost in dp due to low condensing by use on a small pump on the liquid line.
Kind Regards. Andy.