Heat Pump Drying System Home › Electrical Engineering Forum › General Discussion › Heat Pump Drying System This topic has 0 replies, 1 voice, and was last updated 7 years, 9 months ago by htun wai. Viewing 1 post (of 1 total) Author Posts 2017/03/29 at 4:27 am #17371 htun waiParticipant Hi, I am studying heat pump drying system.I would like to know,when do they operate compressor,condenser,evaporator,external condenser. Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In