초록 ▼

In a refrigerating cycle with a by-pass line 5 detouring the condenser 2 in an auxiliary heating mode the amount of circulated refrigerant is controlled in accordance with load, etc. so that the heating can be suited to such conditions. A regulator 20 for controlling the outlet pressure of the evapo

In a refrigerating cycle with a by-pass line 5 detouring the condenser 2 in an auxiliary heating mode the amount of circulated refrigerant is controlled in accordance with load, etc. so that the heating can be suited to such conditions. A regulator 20 for controlling the outlet pressure of the evaporator to a fixed level allows to use an evaporator 4 having ordinary pressure resistance. An accumulator 6 for temporarily storing low-pressure refrigerant liquid is provided between the outlet of evaporator 4 and a compressor 1. In an auxiliary heating mode the amount of the circulated refrigerant passing the by-pass line 5 is controlled by the accumulator 6. Simultaneously the regulator is controlling the outlet pressure of the evaporator to an essentially fixed level.

대표청구항 ▼

1. A refrigerating cycle, having a main line and a by-pass line, a compressor, a condenser in said main line downstream the compressor, an evaporator downstream said condenser, an accumulator between said evaporator and said compressor, at least one expansion valve means for adiabatically expanding

1. A refrigerating cycle, having a main line and a by-pass line, a compressor, a condenser in said main line downstream the compressor, an evaporator downstream said condenser, an accumulator between said evaporator and said compressor, at least one expansion valve means for adiabatically expanding a refrigerant, and refrigerant flow switching means for selectively supplying the refrigerant in a cooling mode to said condenser and in a heating mode to said by-pass line, wherein said accumulator is designed as a refrigerant-amount-controlling means for the refrigerant-amount passing said by-pass line in the heating mode, wherein an evaporator-outlet-pressure regulator is provided between the outlet of the evaporator and an inlet of the accumulator for controlling the outlet pressure of the evaporator within a limited pressure range, and wherein a by-pass cooling mode passage is by-passing regulator and is connecting the outlet of the evaporator directly to the inlet of the accumulator, and wherein a by-pass passage on-off valve for opening/closing said by-pass cooling mode passage is provided along said by-pass cooling mode passage.