US 6,581,397 B1 · Refrigerating device

Abstract

A refrigerating device has a refrigerant circuit having a compressor (1), an indoor heat exchanger (3), a main motor operated valve (EV1), and an indoor heat exchanger (5) connected in a loop, and uses, as a working medium, an R32 refrigerant or a mixed refrigerant containing R32 at at least 70 wt %. A supercooling heat exchanger (11) is disposed between the indoor heat exchanger (3) and the main motor operated valve (EV1), and the liquid side of the refrigerant circuit are connected to the gas side by by-pass pipes (33, 34) through the supercooling heat exchanger (11). A supercooling motor operated valve (EV2) is disposed at the by-pass pipe (33) upstream of the supercooling heat exchanger (11). A discharge temperature detected by a discharge temperature sensor (21) is determined by a discharge temperature determination part (10 b), and based on the determination result, the opening of the supercooling motor operated valve (EV2) is controlled so as to control an amount of the refrigerant flowing through the by-pass pipes (33, 34), whereby, using the working medium containing R32, the discharge temperature of the compressor is optimized without reducing the efficiency, and the COP and reliability are improved.

Claims13

Dependent claims

A refrigerating device comprising:

a refrigerant circuit having a compressor (1), a condenser (3, 5), a main pressure-reducing means (EV1), and an evaporator (5, 3) connected in a loop;
a supercooling heat exchanger (11) disposed between the condenser (3, 5) and the main pressure-reducing means (EV1);
a by-pass pipe (33, 34) by which a gas side of the refrigerant circuit and a liquid side thereof are connected through the supercooling heat exchanger (11);
and
a supercooling pressure-reducing means disposed at the by-pass pipe (33, 34) upstream of the supercooling heat exchanger (11), wherein:
the refrigerating device uses an R32 refrigerant or a mixed refrigerant containing the R32 refrigerant at at least 70 wt %;
and
the refrigerating device further comprises:
a discharge temperature sensor (21) detecting a discharge temperature of the compressor (1);
a discharge temperature determination part (10b) determining the discharge temperature detected by the discharge temperature sensor (21);
and
a control part (10a) controlling the supercooling pressure-reducing means, based on a result of determination made by the discharge temperature determination part (10b), to control an amount of the refrigerant flowing through the by-pass pipe.

9 more elements

Dependencies are inferred from the claim text.

Refrigerating device

Life of this patent

Refrigerating device

Life of this patent

Abstract

Claims13