To solve a problem wherein frost formation cannot be determined accurately when static pressure is changed without frost formation on an outdoor heat exchanger and when an air pressure sensor itself has variations.
This refrigerating device includes: a refrigerant temperature sensor 13 sensing a temperature of the outdoor heat exchanger 3; the air pressure sensor 15 sensing the pressure of air made to pass through the indoor heat exchanger 3; an air pressure sensing unit 20 using a sensed value by the air pressure sensor 15 as an input value during heating operation; and a frost formation determination unit 22 storing, in a storage unit 21, an output value by the air pressure sensing unit 20 when a sensed value by the refrigerant temperature sensor 13 becomes smaller than a predetermined value and comparing the value stored in the storage unit 21 with the output value by the air pressure sensing unit 20 to determine whether or not the outdoor heat exchanger 3 has frost formation.
| JPS59229141 | AIR CONDITIONER |
| WO/2013/012523 | DEFROST FOR TRANSCRITICAL VAPOR COMPRESSION SYSTEM |
TAZUMI YOSHIKIMI
Daisuke Nagano
Kentaro Fujii