Heat pump device and drying machine

A heat pump device comprising:

• a heat pump comprising a refrigerant circuit;
• a water-cooling heat exchanger for taking heat of a refrigerant in the refrigerant circuit;
• water amount adjusting valve for adjusting the amount of cooling water supplied into the water-cooling heat exchanger;
• temperature detecting means for detecting the temperature of the cooling water in the water-cooling heat exchanger or the temperature of the refrigerant passed through the water-cooling heat exchanger;
• and
• control means for controlling the water amount adjusting valve,
• wherein the control means judges abnormal water supplying into the water-cooling heat exchanger in accordance with the controlling state of the water amount adjusting valve and a change of the temperature detected by the temperature detecting means under the controlling state,
• wherein during an abnormal water supply detection by the control means, a high-temperature refrigerant flows into the water-cooling heat exchanger by bypassing a gas cooler, such that if the water amount adjusting valve is brought into a closed state by the control means, but no temperature rise is detected in the water-cooling heat exchanger for a predetermined time, the control means determines that the water amount adjustment valve cannot be brought into a fully closed state;
• and, alternatively, if the water amount adjusting valve is brought into an open state by the control means, but no temperature drop is detected in the water-cooling heat exchanger for a predetermined time, the control means determines that the water amount adjustment valve is abnormal.