This system canwork in three modes determined by the outdoor
temperature. In cold weather it works in thermosyphon mode, only
the fans of three-fluid heat exchanger and evaporator work to cool
the data center using natural cold source of air. The working fluid in
the thermosyphon absorbs heat and vaporizes in the evaporator,
condenses in the three-fluid heat exchanger and then flows back to
the evaporator under gravity. In hotweather itworks in refrigeration of a 2 HP air conditioner is used in the refrigeration loop. To avoid
liquid hammer, the superheat degree of the outlet of the evaporator
is controlled by the expansion valve. Moreover, an accumulator is
installed on the inlet of the compressor to avoid liquid refrigerant
entering the compressor.