The invention discloses a refrigerating unit
waste heat upgrading hot water utilization
system and method, which are suitable for recycling and utilizing
waste heat under a mine. The
system comprisesa spraying type air dehumidification device arranged in a humid and hot environment and a
waste heat grading combination device arranged behind a
refrigeration compressor. A
moisture absorption concentrated solution is sprayed in the spraying type air dehumidification device to absorb
latent heat of
water vapor; according to the circulating cooling water waste heat upgrading hot water utilizationsystem, a high-temperature
moisture absorption concentrated solution in a corrugated plate type heat regenerator and
water vapor in a phase-change heat exchange device II are connected in series to perform graded heat exchange with circulating water, so waste heat at different temperatures is effectively used; according to the
system, the
working pressure of the waste heat grading combination device is regulated and controlled through the middle steam extraction pump and the electromagnetic control valve, the temperature of
water vapor in the phase-change heat exchange device is achieved, andtherefore the temperature of a circulating cooling water outlet in the waste heat grading hot water utilization system of the refrigerating unit is adjusted.