Refrigerant system

The refrigerant system comprises a compressor, a first heat exchanger, a second heat exchanger and a control device, the first heat exchanger and the second heat exchanger are communicated with the compressor, the compressor is provided with an exhaust port, the first heat exchanger comprises a first heat exchange part and a second heat exchange part, and the first heat exchange part and the second heat exchange part are provided with refrigerant flow paths and water paths which exchange heat with each other; the control device can control the refrigerant system to be switched between a first mode and a second mode, in the first mode, a refrigerant loop is formed among the compressor, the first heat exchange part and the second heat exchanger, and a refrigerant loop is formed among the compressor, the second heat exchange part and the second heat exchanger; and in the second mode, a refrigerant loop is formed among the compressor, the second heat exchanger and the first heat exchange part, and a refrigerant loop is formed among the compressor, the second heat exchange part and the first heat exchange part. According to the technical scheme, the refrigerant system can defrost under the condition that the compressor is not shut down.