I want to make a liquid chilling tank and want to know how to determine the following:-Length of Evaporator coilDiameter of Evaporator coilLength and size of CapillaryI have a 1/4 H/P SECOP Condensing unit, FR8.5CL on 404ARequired temperature of liquid to run at a constant -30 cLiquid tank capacity will be 20 LitresThe insulated tank will be positioned directly below the condensing unit.If anyone can give me some specifics here that would be appreciated.