The simulation model of industrial conditioning systems.

This paper describes a simulation program which was developed for the modelling of air-conditioning systems and conditioned spaces in industrial buildings. The program can be used for a design of systems for new buildings and for analysis of existing ones. By viewing the building as a dynamic entity, it is possible to investigate how thermal capacity of the building elements acts on both the conditioned space and the performance of the air-conditioning system. The program simulates three important aspects of a building. Simulation of the central air-conditioning system determines enthalpy, temperature and humidity of the air at different points of the system. System performance, capacity requirements and energy consumption under various circumstances are also determined. Simulation of the conditioned space shows its temperature and humidity, when different central air-conditioning systems, airflows and supply-air temperatures are being used. Simulation of the control system makes it possible to investigate the effect of different control methods and devices on the performance of the components of the central air-conditioning system and on the conditions within the conditioned space. Corditions in the simulated space, capacity requirements of the central air-conditioning system and the air mixture conditions regarding fresh and recirculated air have been compared with measured values. The measurements have shown that simulation gives a realistic indication of how the simulated aspects behave under the given circumstances. The temperatures of the simulated space have also been compared with the values calculated by the Ventac-program. The average difference was 0,2°C.