DIRcalc gives the possibility to select a number of Danfoss products for subcritical CO2 applications. DIRcalc selects calculate pressure drops, velocities and other important parameters necessary to make a qualified choice of components. Components could be calculated separately as well as in valve trains. Additionally to Danfoss components DIRcalc can calculate standard pipes, bends and fittings, both steel and copper. The use of this software is free.