Intertwined Evaporator

Hi,

Has anybody experience of making calculations for the heat transfer using an interlaced finned tube heat exchanger?

For example, using two separate refrigerants in two vapour loops but using the one evaporator or by using one refrigerant circuit and one brine circuit through one evaporator.

Cheers,
Andy

Answer NO but I bet any coil / heat exchanger fabricator in the country will have all the info you need at their finger tips.