The synthesis procedure of multidimensional regulator for precision air conditioner with steam humidifier

Abstract

The automatic control system (ACS) of air conditioning is considered in the framework of the unified computer-integrated complex with technological links of the air conditioner equipment. Taking into account the availability of dynamic models of HVAC equipment in the state space (developed by the authors in the previous works) precision air conditioner complex mathematical model with steam humidifier for the stabilization of microclimate parameters in the premises is obtained considering the technological relations between the climatic equipments.The dynamic model differs from the existing one by technological linkages due to sequential treatment of the supply air for the HVAC equipment and the use of moisture content parameter (instead of relative humidity) for mass transfer modeling in the process of air preparation. The procedure of optimal multivariate linear-quadratic digital controller (LQDC) in the state space, which takes into account the logical switching in HVAC equipment operation for the modified control algorithm by the “optimum mode” method, is offered. Simulation of transient processes for the ACS of precision air conditioning has confirmed the effectiveness of the proposed procedure of multidimensional control synthesis. Additional condition is the usability of the obtained model in the MatLAB environment.The ACS use with LQDC improves the integral quality indicators by 1.2 – 2.3 times in comparison with the ACS which uses one-dimensional digital controllers, and also decreases the colunt and duration of the transient processes. This approach allows us to rethink the synthesis of ACS air conditioning on the basis of differentiation of the mutual influence of governing parameters and it enables the transferring of the air conditioning control system to the qualitatively new level and provides the effective use of energy for artificial microclimate systems.