Ground source heat pump

[Cooler]

Evening Gentleman. I hope some of you learned people can help me. I have been looking these heat exchangers by alpha laval for a home made system.
http://www.alfalaval.com/ecoreJava/W...4&languageID=1
I hope to base the design on Viessmanns design guide which gives information on GSHP design.

I would appreciate if some of you chaps could tell me the correrelation between evaporator and condensing PHE sizing for a water to refrigerant application.
The project is for a highly insulated new build with 2 floors. The heat loss is about 8.8KW per floor.
Viessmann,s gives detailed information for their Vitocal 300 which has a refrigerant capacity of 8.4 KW @ brine inlet temperature of 0 C and a heating water outlet temperature of 35 C.
Many Thanks.

[Cooler]

Help ,anyone please .