Water-cooled direct-expansion air conditioning unit performance analysis of underground railway station

Through the performance experiments of water-cooled direct-expansion air conditioning unit, tests the integrated part load value of the prototype, analyses the influence of the main factors on the performance and state parameters of the unit. The results show that there is a negative correlation between the head-on wind speed of the unit and the heat exchange efficiency of wet-bulb temperature of the evaporator. The change of the compressor speed and fan speed has a great impact on the refrigeration capacity and energy efficiency ratio of the unit.