Exergonomic Optimization of an Air-Conditioning System

Abstract

In this paper, exergonomic theory is applied to an air-conditioning system for optimization purposes. The investigation is addressed to an all-air system with air recirculation, The thermodynamic cycle includes a mixing plenum, a cooling and heating coil, chiller, and heater. The thermodynamic model is stated according to recent formulations of exergy for moist air streams, while the economic model is based on cost balance equations and real cost data for mechanical equipment. The objective function to minimize includes the following decision variables: fresh to total air rate, coefficient of performance for the chiller, inlet temperature of water for the cooling and the heating coils, temperature difference of the same streams. For the exergonomic optimization, the authors followed the approach proposed by Tsatsaronis (1984). The optimum configuration is obtained through an iterative procedure aimed at the design improvement. The results show that there is considerable room for improvement with respect to a system based on typical design parameters.

Thermoeconomic optimization of the geometry of an air conditioning precooling air reheater dehumidifier

“…These can be expressed as follows (Bejan, 1997;Cammarata et al, 1997): Once the magnitude of the average of temperatures, pressures and humidity ratio at the outlets are evaluated, the outlet state values of exergy can be obtained. Once the magnitude of the temperatures and pressures at the outlets are evaluated, the specific values of exergy can be obtained.…”

Multi-objective optimization of a cooling tower assisted vapor compression refrigeration system

“…The Lagrange multipliers method was utilized for minimization of the objective function. Cammarata et al (1997) presented an economic method for optimizing a thermodynamic cycle of an air conditioning system. Global optimum values were found using the direct mathematical method.…”

Thermodynamic and thermoeconomic optimization of a cooling tower-assisted ground source heat pump

“…The principles and methodologies of thermoeconomics have been established by Bejan et al (1996). Some works in the application of thermoeconomic optimization of heat pump systems were carried out by Wall (1991), Cammarata et al (1997), andEl-Sayed (1999). Sayyaadi et al (2009) performed a multi-objective optimization for a vertical GSHP system in cooling mode.…”