Cascade unit and refrigeration cycle apparatus

A cascade unit of a refrigeration cycle apparatus,

• the refrigeration cycle apparatus including:
• a first circuit including a first heat exchanger in which a heat medium carrying heat flows, the first heat exchanger causing a heat source and the heat medium to exchange heat with each other;
• a second circuit in which a refrigerant flows, the second circuit including a compressor and a second heat exchanger that exchanges heat with indoor air;
• and
• a cascade heat exchanger that exchanges heat between the heat medium flowing in the first circuit and the refrigerant flowing in the second circuit,
• the cascade unit comprising:
• the compressor configured to discharge the refrigerant in a supercritical state;
• the cascade heat exchanger,
• an electric component;
• a fan that generates an air flow around the electric component;
• a cascade casing that accommodates the compressor, the electric component, and the fan;
• and
• an electric component casing that accommodates the electric component and is disposed above the compressor,
• wherein the refrigerant is a refrigerant including a carbon dioxide refrigerant,
• the electric component casing houses the fan and an electric component mounting plate to which the electric component is mounted, and has a first surface located between the compressor and the electric component and has a bottom surface located between the compressor and the electric component,
• the bottom surface seals an inner space of the electric component casing from below,
• the electric component casing has an electric-component-casing-intake-opening,
• the cascade casing has a cascade-casing-intake-opening,
• the electric-component-casing-intake-opening and the cascade-casing-intake-opening are configured to guide air outside the cascade casing into the electric component casing by driving of the fan,
• the guided air is directed by a ventilation opening of the electric component mounting plate to flow along opposite sides of the electric component mounting plate within the electric component casing, and
• the electric-component-casing-intake-opening is provided on neither the first surface nor the bottom surface.

A cascade unit of a refrigeration cycle apparatus,

• the refrigeration cycle apparatus including:
• a first circuit including a first heat exchanger in which a heat medium carrying heat flows, the first heat exchanger causing a heat source and the heat medium to exchange heat with each other;
• a second circuit in which a refrigerant flows, the second circuit including a compressor and a second heat exchanger that exchanges heat with indoor air;
• and
• a cascade heat exchanger that exchanges heat between the heat medium flowing in the first circuit and the refrigerant flowing in the second circuit,
• the cascade unit comprising:
• the compressor configured to discharge the refrigerant in a supercritical state;
• the cascade heat exchanger;
• an electric component;
• a fan that generates an air flow around the electric component;
• a cascade casing that accommodates the compressor, the electric component, and the fan;
• and
• an electric component casing that accommodates the electric component and is disposed above the compressor,
• wherein the refrigerant is a refrigerant including a carbon dioxide refrigerant,
• the electric component casing houses the fan and an electric component mounting plate to which the electric component is mounted, and has a first surface located between the compressor and the electric component and has a bottom surface located between the compressor and the electric component,
• the electric component casing has an electric-component-casing-intake-opening and a top surface opening,
• the electric component mounting plate is provided between the electric-component-casing-intake-opening and the top surface opening,
• the electric component mounting plate has a ventilation opening,
• the cascade casing has a cascade-casing-intake-opening,
• the electric-component-casing-intake-opening and the cascade-casing-intake-opening are configured to guide air outside the cascade casing into the electric component casing by driving of the fan, and
• the electric-component-casing-intake-opening is provided on neither the first surface nor the bottom surface.