Abstract: A multi-row heat exchanger includes tube holding devices positioned at the ends of the rows of heat exchange elements in the multi-row heat exchanger. One of the tube holding devices is fixedly secured to the tubes of each row of heat exchange elements. The other tube holding device is secured to the tubes of only one row of heat exchange elements. The latter tube holding device includes a slotted opening for receiving unsecured ends of the tubes in the other row of heat exchange elements. A process for forming the above multi-row heat exchanger is also disclosed.

Abstract: A plurality of heat transfer tubes are disposed at certain intervals, in-tube operating fluid (such as coolant) passes therethrough, and a plurality of small-gage wires are used as a heating fin. One small-gage wire is wound at a pair of heat transfer tubes 1a and 1c in a spiral manner, and another small-gage wire is wound at a pair of heat transfer tubes 1b and 1c in the spiral manner, and still another small-gage wire is wound at a pair of heat transfer tubes 1b and 1d in the spiral manner. Thereby, while higher heat transfer coefficient can be achieved, and a heating surface area is ensured, clogging can be avoided even when moisture in air condenses on a surface of a heat exchanger. As a result, it is possible to realize a high-performance and compact heat exchanger used for air conditioning.

Abstract: The invention relates to refrigeration apparatus such as freezers, refrigerators and bottle/can coolers/chillers. A condenser (5) is normally located on a rearmost side of a refrigeration apparatus. The condenser (5) comprises a pipe (10) for containing a refrigerant, one or more adjacent portions (15) of the pipe (10) being connected by a baffle (20, 25), characterised in that the baffle provides a plurality of wall portions, at least some wall portions (40, 45, 50, 55) being disposed in opposing directions relative to a plane extending between respective adjacent portions of the pipe.

Abstract: A heat exchanger mounted on an air condition is constructed such that at least one row of heat conduction pipe groups are arranged across an air passage. Each heat conduction pipe groups is constructed such that a plurality of heat conduction pipes 22 are arranged in parallel with each other and a fine wire 23 made of a metallic material having excellent heat conductivity is spirally wound around each adjacent heat conduction pipes 22. Thus, performances of the heat exchanger can be improved without a possibility that the air conditioner is designed with larger dimensions. In addition, the heat exchanger includes a plurality of heat conduction pipes 39 arranged in the form of at least one row with a constant distance between adjacent ones and a plurality of twisted wires 40.

Abstract: An improved method is provided for assembling a heat exchanger by mechanically joining one or more pairs of tubes with fins arranged in a fin pack. The method involves a novel external expansion technique that is performed between pairs of tubes and internally of the fin pack, in a manner that enhances the mechanical joint strength and metal-to-metal contact between the tubes and fins of the heat exchanger, while enabling the assembly process to be reduced to a single operation. Consequently, the method of this invention avoids the shortcomings of internal expansion techniques, and provides a significant improvement over prior art external expansion techniques. The method of this invention also yields a novel heat exchanger configuration, in which only facing surfaces of the tube within the fin pack are deformed in order to expand and mechanically join the tube to the fins. Finally, the present invention also encompasses a unique expansion tool for externally expanding the tube portions within the fin pack.