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Cur rently, wa ter-cooled screw chiller is widely ap plied in com mer cial and in dus trial build ings, and the en ergy con sump tion of wa ter chiller even could cover 70% of air-con di tion ing en ergy con sump tion in the most ad verse op er at ing con di tions. More over, a num ber of chill ers are run ning at a low rate un der part-load state. In or der to re duce the en ergy con sump tion of wa ter-cooled screw chill ers un der part-load state, the pa per pres ents the par al lel ing throt tle mech a nism. Through ex per i men tal study, un der part-load state, it can be found that the by-pass tube di am e ter Ø16 has the most pos i tive ef fect on the per for mance of wa ter-cooled screw chiller in four by-pass tube di am e ters. The oblique ac cess mode is better than the ver ti cal ac cess mode, while the spi ral ac cess mode has lit tle in flu ence on the chiller per for mance. Be cause of par al lel ing throt tle us ing, the exergetic loss of the evap o ra tor and chiller is able to be re duced by 3.4%-15.5% and 0-6.7%, re spec tively. Mean while, the co ef fi cient of per for mance of chiller can be en hanced by 0.2%-1.6%, and dis charge tem per a ture can be re duced by 0.4-2.7 °C. In ad di tion, the eco nomic and en vi ron men tal ben e fits of the ad vanced wa ter-cooled screw chiller are more ev i dent than the con ven tional wa ter-cooled screw chiller's.

Performance improvement of water-cooled screw chiller under part load operation conditions by the paralleling throttle mechanism