Hi Boys and girls,

At present i am competing against a large company who have excellent marketing skills.
However I believe the marketing is overriding engineering priciples, not a bit, a lot to where it seems to me that the info is just out right lying!

So the machine.

It is PCM (phase change material) storage system, the PCM are in balls which are 80mm diameter and freeze at -2C
These balls are frozen by a circulating glycol (multi-pass over time). What temp would you expect the cold feed glycol to be to freeze these PCM balls?

Of course this glycol has to be chilled, after removing energy from the PCM balls, What then would you expect the SST (Te) to be?

Now they claim that the system (comp, fan and pumps) has a cooling COP of 3.3.
The system is closed coupled, the compressor is a scroll and not insulated, and is within the condenser air stream.

For ease in calculations lets say the net cooling duty is around 30kw

This is where you going to think, to achieve the COPs shown, what will the SCT (Tc) be. Knowing this what do you expect the discharge temp to be?

I am after real numbers, not pure numbers at 100% isentropic efficiency.

Thanks for those who take the challenge.

Mad.