Abstract
This paper sets out to compare two different cooling systems that use vapor compression chillers for air conditioning environments. It was proposed to compare different operations in isolated and combined action operations. These operations are evaluated in the 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 determine the thermophysical properties 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 configurations. The results showed that the system with a differentiated compression presents a COP equal to that of the system with screw chillers in the range 0-300 RTs, and a COP hat is on average 9% higher in the range 400-800 RTs.
Highlights
The number of buildings has grown dramatically in recent decades, increasing the demand for air conditioning
As for energy efficiency, green buildings should seek strong alternative energy sources and have emergency arrangements to ensure lighting in case of accidents; control consumption and pursue total efficiency
A comparison is made between the actual data of the installation within a range of applications and numerically stimulated data from the same system
Summary
The number of buildings has grown dramatically in recent decades, increasing the demand for air conditioning. It becomes imperative to seek optimum design, installation, maintenance and operation (WARREN; TAYLOR, 2008; YU; CHAN, 2008; CARVALHO et al, 2012; SCHIBUOLA; SCARPA, 2014; OCHOA et al, 2015), so that the system consumes less energy, thereby air conditioning within the technical standards. That buildings are considered green, they must follow strict precepts and determinations such as meeting national and international green standards for: construction, air quality; energy use; water use; labor safety and hygiene of the work environment; use of environmentally friendly materials; ergonomic fixtures and fittings; correct treatment of solid waste and controlling emissions. As for energy efficiency, green buildings should seek strong alternative energy sources and have emergency arrangements to ensure lighting in case of accidents; control consumption and pursue total efficiency
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