The invention provides an energy-saving fine control method and device for a central air conditioner of a ten-stage purification workshop. A
control system controls all systems to start and operate, and
cold air passes through a fan filtering unit and a
raised floor to achieve indoor purification circulation; the cold and heat
source system carries out cooling treatment, and the cold water outlet temperature is 5 + / -0.5 DEG C; the temperature and
humidity control fluctuation range of the first temperature and
humidity sensor and the second temperature and
humidity sensor is + / -0.3 DEG C / + / -0.8% RH; the
control system automatically regulates and controls the air conditioner air cabinet and the cold and heat
source system and comprises the steps that measured data of the indoor temperature, the indoor humidity, the air supply temperature, the air supply humidity and the
fresh air dew point temperature are input into a pre-constructed temperature and humidity
coupling model, and temperature and humidity regulation information is formed through calculation; the
control system conducts
refrigeration, heating and
air volume regulation and control on the air conditioner air cabinet according to the information and conducts
valve opening regulation and control on the cold and heat
source system and the humidification
pipe. According to the invention, the requirement of keeping stable high-precision temperature and humidity under the working condition of ten-grade cleanliness indoors can be met.