Comparative study of air conditioning systems with vapor compression chillers using the concept of green buildings

摘要

This paper sets out to compare two different cooling systems that use vapor compression chillers for air conditioning environments. It was propos ed to compare different operations in isolated and combined action operations. Thes e operations are evaluated in th e concepts of green buildings. A mathematical model was developed based on the principles of mass and energy conservation and complemented by various functions so as to determin e the thermophysical proper ties and efficiencies of the compressors. The equations of the model were solved by the EES (Engineering Equation Solver) program. The model evaluates the influence of the main HVAC operating parameters of the chilled water system when operating under three different configur ations. The results showed that the system with a differentiated compression presents a COP equal to th at of the system with screw chillers in the range 0-300 RTs, and a COP hat is on averag e 9% higher in the range 400-800 RTs.