Whenever condensation of a vapour takes place it creates vacuum. It is intuitive also because same mass when transforms from liquid to vapour phase it' s volume increases by 1000 times or so. Thus the reverse, i.e condensation will reduce the volume by 1000 times. Example- Condensation of steam in thermal power plant condenser. So condensation results in creation of vacuum, even in steady flow systems. But when we look at the basic vapour compression refrigeration cycle we notice that the high pressure high temperature vapour (coming out of compressor) condenses to high pressure low temperature liquid, which further expands through the throttle valve to enter the evaporator.
The question is that how this condenstion of refrigerant vapour happens at high pressure?