Refrigeration apparatus

A refrigeration apparatus comprising:

• a compressor;
• an outdoor heat exchanger connected to the compressor;
• an indoor heat exchanger connected to the compressor;
• and
• an expansion valve disposed between the outdoor heat exchanger and the indoor heat exchanger, wherein
• in cooling operation, a refrigerant flows through the compressor, the outdoor heat exchanger, the expansion valve, and the indoor heat exchanger in this order,
• in heating operation, the refrigerant flows through the compressor, the indoor heat exchanger, the expansion valve, and the outdoor heat exchanger in this order,
• the refrigerant is an HFO (hydrofluoroolefin) refrigerant or a refrigerant mixture that includes an HFO refrigerant,
• the indoor heat exchanger and the outdoor heat exchanger are cross-fin-type heat exchangers or stack-type heat exchangers,
• the outdoor heat exchanger has a two-row configuration, and
• 130≤S≤1.3483E−03×ρ{circumflex over ( )}2−2.1115E+00×ρ+1.0996E+03
• where
• S [%] is a volume ratio of the outdoor heat exchanger to the indoor heat exchanger, and
• ρ [kg/m{circumflex over ( )}3] is an average density of a saturated liquid gas of the refrigerant at a condensation temperature of 45° C.

A refrigeration apparatus comprising:

• a compressor;
• an outdoor heat exchanger connected to the compressor;
• an indoor heat exchanger connected to the compressor;
• and
• an expansion valve disposed between the outdoor heat exchanger and the indoor heat exchanger, wherein
• in cooling operation, a refrigerant flows through the compressor, the outdoor heat exchanger, the expansion valve, and the indoor heat exchanger in this order,
• in heating operation, the refrigerant flows through the compressor, the indoor heat exchanger, the expansion valve, and the outdoor heat exchanger in this order,
• the refrigerant is an HFO (hydrofluoroolefin) refrigerant or a refrigerant mixture that includes an HFO refrigerant,
• the indoor heat exchanger is a cross-fin-type heat exchanger,
• the outdoor heat exchanger is a stack-type heat exchanger,
• the outdoor heat exchanger has a one-row configuration, and
• 100×α≤S≤(1.0112E−03×ρ{circumflex over ( )}2−1.5836E+00×ρ+8.2427E+02)×α
• where
• S [%] is a volume ratio of the outdoor heat exchanger to the indoor heat exchanger,
• α is a volume ratio of the stack-type heat exchanger to the cross-fin-type heat exchanger when the cross-fin-type heat exchanger and the stack-type heat exchanger have identical heat exchange performance, and
• ρ [kg/m{circumflex over ( )}3] is an average density of a saturated liquid gas of the refrigerant at a condensation temperature of 45° C.

A refrigeration apparatus comprising:

• a compressor;
• an outdoor heat exchanger connected to the compressor;
• an indoor heat exchanger connected to the compressor;
• and
• an expansion valve disposed between the outdoor heat exchanger and the indoor heat exchanger, wherein
• in cooling operation, a refrigerant flows through the compressor, the outdoor heat exchanger, the expansion valve, and the indoor heat exchanger in this order,
• in heating operation, the refrigerant flows through the compressor, the indoor heat exchanger, the expansion valve, and the outdoor heat exchanger in this order,
• the refrigerant is an HFO (hydrofluoroolefin) refrigerant or a refrigerant mixture that includes an HFO refrigerant,
• the indoor heat exchanger is a cross-fin-type heat exchanger,
• the outdoor heat exchanger is a stack-type heat exchanger,
• the outdoor heat exchanger has a two-row configuration, and
• 130×α≤S≤(1.3483E−03×ρ{circumflex over ( )}2−2.1115E+00×ρ+1.0996E+03)×α
• where
• S [%] is a volume ratio of the outdoor heat exchanger to the indoor heat exchanger,
• α is a volume ratio of the stack-type heat exchanger to the cross-fin-type heat exchanger when the cross-fin-type heat exchanger and the stack-type heat exchanger have identical heat exchange performance, and
• ρ [kg/m{circumflex over ( )}3] is an average density of a saturated liquid gas of the refrigerant at a condensation temperature of 45° C.

A refrigeration apparatus comprising:

• a compressor;
• an outdoor heat exchanger connected to the compressor;
• an indoor heat exchanger connected to the compressor;
• and
• an expansion valve disposed between the outdoor heat exchanger and the indoor heat exchanger, wherein
• in cooling operation, a refrigerant flows through the compressor, the outdoor heat exchanger, the expansion valve, and the indoor heat exchanger in this order,
• in heating operation, the refrigerant flows through the compressor, the indoor heat exchanger, the expansion valve, and the outdoor heat exchanger in this order,
• the refrigerant is an HFO (hydrofluoroolefin) refrigerant or a refrigerant mixture that includes an HFO refrigerant,
• the indoor heat exchanger is a stack-type heat exchanger,
• the outdoor heat exchanger is a cross-fin-type heat exchanger,
• the outdoor heat exchanger has a one-row configuration, and
• 100/α≤S≤(1.0112E−03×ρ{circumflex over ( )}2−1.5836E+00×ρ+8.2472E+02)/α
• where
• S [%] is a volume ratio of the outdoor heat exchanger to the indoor heat exchanger,
• α is a volume ratio of the stack-type heat exchanger to the cross-fin-type heat exchanger when the cross-fin-type heat exchanger and the stack-type heat exchanger have identical heat exchange performance, and
• ρ [kg/m{circumflex over ( )}3] is an average density of a saturated liquid gas of the refrigerant at a condensation temperature of 45° C.

A refrigeration apparatus comprising:

• a compressor;
• an outdoor heat exchanger connected to the compressor;
• an indoor heat exchanger connected to the compressor;
• and
• an expansion valve disposed between the outdoor heat exchanger and the indoor heat exchanger, wherein
• in cooling operation, a refrigerant flows through the compressor, the outdoor heat exchanger, the expansion valve, and the indoor heat exchanger in this order,
• in heating operation, the refrigerant flows through the compressor, the indoor heat exchanger, the expansion valve, and the outdoor heat exchanger in this order,
• the refrigerant is an HFO (hydrofluoroolefin) refrigerant or a refrigerant mixture that includes an HFO refrigerant,
• the indoor heat exchanger is a stack-type heat exchanger,
• the outdoor heat exchanger is a cross-fin-type heat exchanger,
• the outdoor heat exchanger has a two-row configuration, and
• 130≤S≤1.3483E−03×ρ{circumflex over ( )}2−2.1115E+00×ρ+1.0996E+03
• where
• S [%] is a volume ratio of the outdoor heat exchanger to the indoor heat exchanger,
• α is a volume ratio of the stack-type heat exchanger to the cross-fin-type heat exchanger when the cross-fin-type heat exchanger and the stack-type heat exchanger have identical heat exchange performance, and
• ρ [kg/m{circumflex over ( )}3] is an average density of a saturated liquid gas of the refrigerant at a condensation temperature of 45° C.