Originally Posted by
barbar
You have mis-understood,
You have a fixed flow through evap and the control loop (3 port valve) care of the thermal buffer (no requirement for fancy refrigerant flow control),
the buffer is sized for 6 mins of load (to ensure number of comp starts per hour)
You draw a predetermined temp from the control loop, to your rink control. At this point you can glycol flow in which ever way you require.
A single compressor, a single PHE and Cond, will be cheaper than 3. Be careful not to be penny wise, pound foolish.
Remember that you do require some level of superheat, so you do need to increase your TD a bit, or introduce external of the evap.