Heat pump system

A heat pump system, the heat pump system having a refrigeration mode and a heating mode, wherein the heat pump system comprises:

• a compressor, the compressor comprising an air suction port and an exhaust port;
• a first heat exchanger, the first heat exchanger being configured to be able to act as a falling film evaporator or a condenser, the first heat exchanger comprising a first port of the first heat exchanger, a second port of the first heat exchanger, a third port of the first heat exchanger, and a fourth port of the first heat exchanger;
• a second heat exchanger, the second heat exchanger comprising a first port of the second heat exchanger and a second port of the second heat exchanger;
• and
• a valve device, the valve device comprising a first connecting port of the valve device, a second connecting port of the valve device, a third connecting port of the valve device, a fourth connecting port of the valve device, and a fifth connecting port of the valve device;
• wherein the first connecting port of the valve device is connected to the exhaust port of the compressor through a first pipeline, the second connecting port of the valve device is connected to the first port of the second heat exchanger through a second pipeline, the third connecting port of the valve device is connected to the air suction port of the compressor through a third pipeline, the fourth connecting port of the valve device is connected to the first port of the first heat exchanger through a fourth pipeline, and the fifth connecting port of the valve device is connected to the fourth port of the first heat exchanger through a fifth pipeline;
• and
• the valve device is configured to:
• when the heat pump system is operating in the refrigeration mode, the valve device communicates the third connecting port of the valve device with the air suction port of the compressor, so that the first heat exchanger acts as the falling film evaporator;
• and
• when the heat pump system is operating in the heating mode, the valve device communicates the first connecting port of the valve device with the exhaust port of the compressor, so that the first heat exchanger acts as the condenser.