Adds in simplified capability of modelling radiant system. Under Opt-Heating-Cooling a new tag Opt-H2K-Type1IsRadiant has been added. If invoked, a radiant system is added where 90% of basement, exposed floors, floors above basement, slabs-on-grade, and crawlspace surfaces are radiant surfaces.
Capability to input airtightness as NLR50 has been introduced for Opt-ACH
Bug fix for modelling ASHP systems that provide both heating and cooling