HEAT EXCHANGER

• Main Author: TSUDA YOSHIYUKI
• Format: Patent
• Language: English
• Published: 30.07.1990
• Subjects: BLASTING; DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OFGENERAL APPLICATION; HEAT EXCHANGE IN GENERAL; HEATING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; LIGHTING; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; TRANSPORTING; WEAPONS

PURPOSE:To delay blockading due to the layer of frost and eliminate the deterioration of heating capacity when heating operation is reopened after defrosting by employing a water repellent fin member, with fine grooves, as a plate fin. CONSTITUTION:The main body of a heat exchanger is constituted by a method wherein a heat transfer tube penetrating hole is bored on a plate type fin 5 made of aluminum, on which a water repellent film 6 is applied on the surface thereof and fine grooves 7 are formed, fin collars 2 are established with equal intervals to penetrate a heat transfer tube 3 made of copper and, thereafter, the tube 3 is fixed and adhered to the plate type fin 5 by means of expanding or the like. Ethylene tetrafluoride resin coating having the pure water contact angle of 110 deg., for example, is used as the water repellent film. Either one of water repellent coatings such as the copolymer resin coating of ethylene tetrafluoride and propylene hexafluoride, silicon resin coating and the like or water repellent surface treatment coated with fatty acid such as stearic acid, lauric acid and the like may be employed as a water repellent surface treatment material. The width and the depth of the fine grooves are not specified especially but the effect of capillary phenomenon is higher when the grooves are provided with more acute angle.