Makes use of Digital enlargement valve to precisely Management the flow of R290 refrigerant in the evaporator in addition to a four-way valve to divert the refrigerant circulation with the defrost operation Heat Vitality from the outside air has long been absorbed and stored from the refrigerant as latent heat. https://zanybookmarks.com/story20559943/the-basic-principles-of-r290-propane-heat-pump