Heat exchanger and refrigeration cycle device

Patent metadata

Field	Value
Publication number	US-10359201-B2
Application number	US-201815882209-A
Country	US
Kind code	B2
Filing date	Jan 29, 2018
Priority date	Jan 30, 2017
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

A heat exchanger includes: a heat transfer pipe in which refrigerant flows; and a spiral groove formed at an inner peripheral surface of the heat transfer pipe. A height of an inner wall of the groove in a radial direction of the heat transfer pipe is equal to or greater than 0.1 [mm], and when a wetted edge length of the heat transfer pipe is S, an inclination angle between a pipe axis direction of the heat transfer pipe and a longitudinal direction of the groove in a section of the heat transfer pipe parallel with the pipe axis direction is θ, and a length of the heat transfer pipe is L, the inclination angle θ is an acute angle, and a wetted area S×L/cos θ of the heat transfer pipe satisfies S×L/cos θ≥0.5 [m2].

First claim

What is claimed is:

1. A refrigeration cycle device comprising:
a heat exchanger comprising:
a heat transfer pipe in which HFO1123 refrigerant or a refrigerant mixture containing the HFO1123 refrigerant flows; and
a spiral groove formed at an inner peripheral surface of the heat transfer pipe, wherein
a height of an inner wall of the groove in a radial direction of the heat transfer pipe is equal to or greater than 0.1 [mm], and
when a wetted edge length of the heat transfer pipe is S, an inclination angle between a pipe axis direction of the heat transfer pipe and a longitudinal direction of the groove in a section of the heat transfer pipe parallel with the pipe axis direction is θ, and a length of the heat transfer pipe is L, the inclination angle θ is an acute angle, and a wetted area S×L/cosθ of the heat transfer pipe satisfies
S×L /cosθ≥0.5[m 2 ];

a throttle device which is connected to the heat exchanger; and
a controller that is configured to control the throttle device such that a flow velocity of the refrigerant in the heat transfer pipe in the case of using the heat exchanger as a condenser is equal to or greater than 50 [kg/(s·m 2 )] and equal to or less than 150 [kg/(s·m 2 )].

2. A refrigeration cycle device comprising:
a heat exchanger comprising:
a heat transfer pipe in which HFO1123 refrigerant or a refrigerant mixture containing the HFO1123 refrigerant flows; and
a spiral groove formed at an inner peripheral surface of the heat transfer pipe, wherein
a height of an inner wall of the groove in a radial direction of the heat transfer pipe is equal to or greater than 0.1 [mm], and
when a wetted edge length of the heat transfer pipe is S, an inclination angle between a pipe axis direction of the heat transfer pipe and a longitudinal direction of the groove in a section of the heat transfer pipe parallel with the pipe axis direction is θ, and a length of the heat transfer pipe is L, the inclination angle θ is an acute angle, and a wetted area S×L/cosθ of the heat transfer pipe satisfies
S×L /cosθ≥0.5[m 2 ];

a throttle device which is connected to the heat exchanger; and
a controller that is configured to control the throttle device such that a flow velocity of the refrigerant in the heat transfer pipe in the case of using the heat exchanger as an evaporator is equal to or greater than 100 [kg/(s·m 2 )] and equal to or less than 200 [kg/(s·m 2 )].

Assignees

• Fujitsu General Ltd

Inventors

• Itakura Shunji
• Horiguchi Ken
• Fuji Toshiyuki
• Shimada Sota
• Funada Kazuya
• Komine Kenji
• Tanaka Junya

Classifications

• F28D7/082

  with serpentine or zig-zag configuration · CPC title

• C09K5/045

  containing only fluorine as halogen · CPC title

• F25B9/002

  characterised by the refrigerant · CPC title

• F25B39/04

  Condensers · CPC title

• F28F13/187 Primary

  especially adapted for evaporator surfaces or condenser surfaces, e.g. with nucleation sites · CPC title