Zadeh's principle extension applied to the evaporative pad cooling systems

Abstract

Evaporative cooling systems involve heat and mass transference processes in air cooling, however, there is an uncertainty in the wet area fraction variable of the board. Mathematical models were developed with the objective of representing the Zadeh extension principal, which is a way of extending a function from the real domain to the fuzzy domain, with a variable being specified as imprecise. This theory is an appropriate form of representing uncertain and imprecise knowledge. Thus, the developed fuzzy models became fuzzy functions instead of real value functions. The development of a software for this model, as well as a test with data collected from a greenhouse of the Universidade Federal de Lavras, show that these models are capable of representing the evaporative cooling system, providing larger generalization, higher precision and becoming an important tool for agriculture and livestock production. In addition, these fuzzy models may be used to increase the efficiency of real evaporative cooling systems.