| 摘要 |
To provide a transportable cooling unit (18) for maintaining a transport volume (16) at a defined temperature, comprising a closed cooling circuit (70) and a controller (90) sensing a temperature present within said transport volume and controlling said cooling circuit so as to provide the cooling power demanded at said evaporator (30) for maintaining said defined temperature and minimizing energy consumption, said controller operates said closed cooling circuit between a minimum possible cooling power and a maximum possible cooling power in a sequence of different operational stages, said controller further operates said closed cooling circuit in each one of at least two upper operational stages at compressor (60) speeds related to different cooling capacities and within said respective upper operational stages said controller (90) operates a compressor (60) in an uninterrupted mode and adjusts said cooling power by stepless speed control of said compressor (60). <IMAGE> |
