Heat source unit and refrigeration apparatus

A refrigeration apparatus, comprising:

• a first circuit in which a first refrigerant having a critical temperature of lower than 45° C. circulates, the first circuit including a first heat exchanger, and
• a second circuit in which a second refrigerant having a critical temperature of equal to or higher than 45° C. circulates, the second circuit including a second heat exchanger,
• a heat source unit comprising:
• the first heat exchanger that includes a plurality of heat transfer tubes arranged in an up-down direction;
• and
• the second heat exchanger, wherein
• the first heat exchanger and the second heat exchanger are stacked in a first direction,
• the first heat exchanger includes:
• a first region formed by an uppermost heat transfer tube and an area above the uppermost heat transfer tube, and
• a second region below the uppermost heat transfer tube, and
• the second heat exchanger overlaps with the second region as viewed in the first direction;
• and
• a utilization unit including a fourth heat exchanger heat exchanging with the first refrigerant, the utilization unit being connected to the heat source unit.

A refrigeration apparatus, comprising:

• a first circuit in which a first refrigerant having a critical temperature of lower than 45° C. circulates, the first circuit including a first heat exchanger;
• a second circuit in which a second refrigerant having a critical temperature of equal to or higher than 45° C. circulates, the second circuit including a second heat exchanger;
• a heat source unit comprising:
• the first heat exchanger that includes a plurality of heat transfer tubes arranged in an up-down direction;
• the second heat exchanger;
• a third heat exchanger that performs heat exchange between the first refrigerant and the second refrigerant;
• a fan that sends air to the second heat exchanger;
• a motor that drives the fan;
• and
• a first support that supports the motor;
• and
• a utilization unit including a fourth heat exchanger heat exchanging with the first refrigerant, the utilization unit being connected to the heat source unit,
• wherein the first support further supports the second heat exchanger,
• the first heat exchanger and the second heat exchanger are stacked in a first direction,
• the first heat exchanger includes:
• a first region formed by an uppermost heat transfer tube and an area above the uppermost heat transfer tube, and a second region below the uppermost heat transfer tube, and
• the second heat exchanger overlaps with the second region as viewed in the first direction.