Temperature and humidity control system with adjustable manual reset

PID control has been widely used for air-conditioning system but there still remain a lot of possibilities. It will be then natural desire to try to eliminate the effects of disturbances before they have created control errors. An example is a certain system for an air-conditioning system in which an outdoor thermometer detects sudden weather changes and the supply air flowrate can be appropriately controlled in anticipation of the change in thermal loads to be felt by the sensors inside the room. This is called feedforward control. In the previous paper, the air-conditioning system was modeled, and the compensation method of manual reset was examined. In this paper, the simulation results for one-day operation will be demonstrated. In particular, the interest is centered on the compensation method to reduce the control performance (energy consumption). Then, the control performances such as the integral value of the square errors and the integral value of the control inputs will be discussed. The purpose of this paper is to simulate combined control of room air temperature and humidity and to demonstrate the control performance associated with these integrated strategies.