Changes 

• Heat pump model included
• One stage system
• Air and ground source 
•  Space heating only
• Auto-generated compressors. Specify cooling or heating capacity instead of selecting compressors
• Groundwater cooling can be used as supplement to mechanical cooling (one stage systems only)
•  Only ATES systems with full thermal balancing included
• Instead of specifying the evaporation temperature, it is now possible to specify the evaporator size (for one stage system). I.e. the evaporation temperature is output from calculation.
• Updated ZB and ZF compressor models from Copeland
• Warnings and errors shown in detail on both monthly energy consumption diagram and summary table
• Icon illustrating calculation state next to "Calculate" button (emphasize warnings) 
• Plots changed so that weather data can be easily displayed
•  Misc improvements and bug fixes...

- Bug fix so that new Dorin compressors are installed when updating an old version of PackCalc

- Changed month and day names so that they are in the same language as the rest of the program (English)

- New Dorin range of subcritical compressors (SCC range) added

- New Dorin range of transcritical compressors (CD range) added

- Improved model of Cooling Tower developed by Danish Technological Institute and Vestas Aircoil

- Power consumption when using free cooling included

- Possible to specify charge for both high and low side in cascade systems when calculating CO2 emissions

- COP calculations for two-stage systems fixed (now condensing heat from low stage is not regarded useful when calculating overall COP)

- Several minor fixes and changes...

- Load profiles from building simulation program BSim can now be imported. See appendix D in user manual.

- 60Hz Dorin CO2 compressors have been included

- Minor changes...

2.27 

- Bock transcritical compressors updated

- Dorin SCS compressors added

- Changes to userinterface so that users are presented to less options. This can be controlled in Options|Preferences menu