Chapter 9 Evaporators, Condensers, Accumulators, and Receiver-Driers 147 Copyright by Goodheart-Willcox Co., Inc. which gives the condenser similar fl ow characteristics as the multifl ow design, explained later in this section. Th e second type is the serpentine type, or single-pass condenser. Serpentine condensers use a single length of tubing throughout its length, Figure 9-8C. Th e tube has multiple internal passages. Th ese are slightly more effi cient than tube and fi n designs. Many R-134a systems use large multifl ow condensers. The multiflow condenser directs refrigerant through a small number of tubes that are laid in rows across the condenser, Figure 9-8D. The refrigerant usually passes through the condenser assembly three or four times before exiting. Both serpentine and multifl ow condensers use headers. A header is simply a pipe which, in the case of a condenser, distributes and collects refrigerant. Th e inlet header dis- tributes refrigerant to each tube while the outlet header collects refrigerant. As with the evaporator, metal fi ns are pressed over the tubing. Th e fi ns on a condenser are similar Figure 9-7. This evaporator case is equipped with an air filter that removes dust, pollen, and odors from the incoming air. This filter is electrostatically charged to assist in filtration. (Lexus) Figure 9-8. Condensers used in automotive applications. A—Tube and fin. B—6 mm tube and fin. C—Serpentine. D—Multiflow. (Modine) A B C D