Hey guys, I was thinking and it's been nudgin at my brain for a bit...
OVERSIZED EVAPORATORS !
Usually in refrigeration condensers are often oversized and we can accommodate controls such as fan cycling and headmasters or a combination of the both to maintain head pressure but what happens when you oversize evaps ?
Larger evaps means more heat being absorbed, more heat = higher superheat.
Larger surface area also = less refrigerant being metered into the evaporator due to the expansion valve being sized for condenser/compressor capacity. This equates to low suction operating pressures.
The only logical thing to do in this situation is to oversize your expansion valve as well to accommodate for the excess heat absorption and surface area of the larger evaporator.
With the larger TXV we can also lower our superheat due to all the heat being absorbed.
However, is there anything else that can be done?
I don't think that cycling fans would be a good option since the customer would look at you weird trying to explain that you need to cycle the evap fans because the evaporator is too big lol
I guess what I'm getting at is, we know how to remedy oversized condensers but what about oversized evaps?
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