Simulation Study Of Temperature And Humidity Independent Control Air Conditioning System In Motor Control Center

Motor control center(MCC) is an important special building in large-scale industrial production of metallurgical and chemical enterprises. In order to ensure the stable operation of the production, equipment within the MCC room must be continuously high load operation, which will generate a lot of heat, so the air conditioning system must be kept running continuously throughout the year to maintain proper indoor temperature and humidity, resulting in high operating costs. In view of air conditioning system of MCC exist the following problems: air conditioning system energy consumption is very large, the design of airflow distribution is unreasonable, and low energy utilization rate, etc. This paper design a temperature and humidity independent control(THIC) air conditioning system of low temperature waste heat driven for MCC room, and analyse the air conditioning’s application effect.First, through on-the-spot investigation, sort out the current existing problems of air conditioning system of MCC room in a certain steel company. Make full use of a large number of low-temperature waste heat in metallurgical enterprises, combining the advantages of THIC air conditioning system in energy saving and control. Designing a THIC air conditioning system of low temperature waste heat driven for MCC room.Secondly, studying the performance of liquid desiccant system of THIC air conditioning system by experiment. Orthogonal experimental analysis show that the sequencing of various factors in the influence on the regeneration performance is the desiccant inlet temperature,liquid-air ratio,desiccant inlet concentration,inlet desiccant flow rate. Particularly, desiccant inlet temperature have a significant impact on the regeneration rate.Through the single factor experiment to determine the control mode is to control the supply air temperature by controlling cooling water temperature and flow; to control the supply air moisture content by controlling the regeneration temperature.Thirdly, this article study the air distribution characteristics of MCC room air conditioning system in different air distribution mode and different supply air temperature by simulation, such as: temperature field, velocity field and so on. The results verify the superiority of downside supply air return air upper. In order to ensure the equipments can table work, saving cooling capacity, and has some temperature margin, finally choose 20 ℃as the supply air temperature for the MCC room. Then analysing the MCC room airflow distribution evaluation index and finding whether ventilation efficiency or energy utilization rate, the downside supply air return air upper way is better than the upper supply air return air side way.Finally, this article use the DEST software to analyse the operation control strategy for the whole year of air conditioning system in the MCC room. On the basis of making full use of natural cold source, get the joint operation scheme of outdoor air cooling + air conditioning at different times throughout the year. Comparing the annual energy consumption result of the conventional air conditioning system with joint operation air conditioning system. Found that the joint operation scheme can save energy consumption 39.5%. And according to the psychrometric chart divide year-round outdoor air condition into four conditions and 7 times. Putting forward different control strategy for different air condition.