Heat exchanger and refrigeration cycle device
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].
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 )].