ABSORPTION REFRIGERATING APPARATUS

Japanese Patent JP3138010

B2

PURPOSE: To improve performance and to reduce size by a method wherein a heat transfer pipe having a groove with a given width and depth formed at a given pitch facing an axially helically extending protrusion formed on the inner surface of a pipe is used as a heat pipe for a condenser and a vaporizer.
CONSTITUTION: A heat transfer pipe 30 is formed in a spiral shape and has a spiral groove 31 formed in the outer surface thereof, and a protrusion 32 is formed on the inner surface of the heat transfer pipe in a manner to be positioned facing the groove 31. A ratio P/D of a pitch P of the groove 31 to the diameter of the heat transfer pipe is set to 0.5-1.25, and the pitch P is, for example, 14 mm. Thus, compared with a smooth pipe, the coefficient of overall heat transmission is improved by 20% or more. A depth H of the groove 31 is, for example, 0.4 mm. When the depth is increased, a refrigerant enters the groove 31 and is not spread over the outer surface of the heat transfer pipe 30 but dropped. When the depth is decreased, turbulence effect operation of cold water owing to the protrusion 32 is reduced, whereby the depth is set to 0.3-0.8mm. Further, a width W of the groove 31 is, for example, 0.9 mm. When the width W is increased, the refrigerant is centralized in the groove 31, whereby the width is set to 0.5-5.0mm. A radius R of the groove is set to 0.4-1.0mm.

JPS5853266	[Title of the Invention] An outdoor side case of a dissociated type air harmony machine
JP5775226	Heat exchanger
JP2520977	[Title of Invention] Absorption Refrigerator

Masahiro Furukawa
Hitoshi Kanuma
Toshiyuki Kaneko

JP16836891A

February 26, 2001

July 09, 1991

Click for automatic bibliography generation  

Sanyo Electric Co., Ltd.

F25B39/00; F25B37/00; (IPC1-7): F25B39/00

JP320577A

Masamasa Shibano

Previous Patent: 不純物吸着量の評価方法及びその評価用装置

Next Patent: METHOD FOR CONTROLLING PLATE THICKNESS OF ROLLING MILL