The invention discloses an energy-saving type closed-type 
cooling tower refrigerating 
system applied to an IDC 
machine room. The energy-saving type closed-type 
cooling tower refrigerating 
system comprises a closed type 
cooling tower, a 
solar absorption refrigeration unit, a cold water tank, a 
chilled water pump, a cooling water pump, an IDC 
machine room 
tail end device, a 
solar heat collector, a first circulation water pump, a heat collecting water tank, a second circulation water pump, an embedded type 
control system, a 
solar absorption type 
refrigeration unit return 
water temperature sensor, a closed type cooling 
tower return 
water temperature sensor, a closed type cooling 
tower inlet air dry-wet ball temperature sensor, a closed type cooling 
tower draught fan 
frequency changer, a closed type cooling tower circulation water pump 
frequency changer and electrically-operated valves, wherein the embedded type 
control system, the 
solar absorption type 
refrigeration unit return 
water temperature sensor, the closed type cooling tower return water temperature sensor, the closed type cooling tower inlet air dry-wet ball temperature sensor, the closed type cooling tower draught fan 
frequency changer, the closed type cooling tower circulation water pump frequency changer and the electrically-operated valves are electrically connected. According to the energy-saving type closed-type cooling tower refrigerating 
system, the closed type cooling tower working condition running manner is adopted, and the solar absorption refrigeration unit cannot be opened at night in winter, in 
transition season and in summer; a closed type cooling tower is used for refrigeration, the solar absorption refrigeration unit is used in the day in summer, 
solar energy is used for refrigeration, energy saving and 
electricity saving are achieved, and the energy-saving type closed-type cooling tower refrigerating system is safe, reliable and environment-friendly.