| 摘要 |
Method of operating a heat pump dryer (1), the heat pump tumble dryer (1) comprising a process air circuit and a heat pump unit (5) having a refrigerant evaporator (6) for cooling process air (4), a primary refrigerant condenser (7) for heating process air (4), an auxiliary refrigerant evaporator (16) arranged outside the process air circuit and connected between the primary refrigerant evaporator (6) and a compressor (8) of the heat pump unit (5), and at least one auxiliary fan (18) adapted to impinge an air stream at the auxiliary heat exchanger (16). The at least one auxiliary fan (16) is activated and deactivated by a control unit (20) according to at least one of
-a temperature of the refrigerant and/or a pressure of the refrigerant, both preferably measured near or at a refrigerant outlet (9) of the primary evaporator (6),
-a temperature of refrigerant near or at an refrigerant outlet or inlet of the auxiliary refrigerant evaporator (16),
-a temperature of the air near or at the auxiliary refrigerant evaporator (16),
-a temperature difference between refrigerant and air near or at the auxiliary refrigerant evaporator (16) and,
-a temperature of the process air (4) and/or humidity of the process air (4), both preferably near or at a process air inlet of a drying chamber (2) of the heat pump tumble dryer (1). |
