Influence of transformation coefficient of refrigerating machine on exergetic efficiency of air conditioning system of operating clean rooms

Abstract

Exergetic method is a universal way of thermodynamic research of various processes of energy transformation in energy technological systems, to which air conditioning system for clean room belongs. Implementation of exergetic analysis for energy technological system makes it possible to determine the influence of various elements of its system on its work and because of this to increase the effectiveness of work of energy technological system in general. Performance of any air conditioning system depends on energy effectiveness of refrigeration machine, which serves it and consumes electricity to reduce the heat of supply air which enters the room. And it means that the main purpose of selection of certain refrigeration machine for air conditioning system is to reach the maximum cooling capacity with minimum energy consumption. Innovative mathematical research model of the implemented central straight flow air conditioning system for operating clean rooms was used in this article. The aim of the model is to make computer estimation of exergetic efficiency of existing air conditioning system depending on different factors which have influence on its work, in particular the coefficient of transformation (or energy efficiency rate, EER) of its refrigeration machine. The dependence of the exergetic output-input ratio of implemented air conditioning system for operating clean rooms on coefficient of transformation of its refrigeration machine by different parameters of outdoor and indoor air and the temperature difference between the indoor and supply air were presented. It is shown that the implemented air conditioning system should be preferably used with higher coefficient of transformation of its refrigeration machine and higher difference between temperatures of indoor and supply air by various temperatures of outdoor air that will give the opportunity to gain the highest exergetic output-input ratio, which means gaining the most cost effective option for the exploitation of implemented air conditioning system.