A major portion of electricity consumption in buildings in residential, administrative, and commercial
sectors is related to air-conditioning (A/C) systems. To reduce and shift the electricity consumption of
A/C systems from on-peak hours to off-peak hours, an ice thermal energy storage (ITES) can be utilized.
In this paper, thermo-economic optimization of an ITES system was carried out for A/C applications. In
order to consider the environmental aspects, a penalty cost was considered for CO2 emission. Applying
the genetic algorithm optimization technique, the optimum values of system design parameters were
obtained. The objective function included the capital and operational costs as well as the penalty cost
due to CO2 emission, without and with costs associated with exergy destruction. The results indicated
that, on average, the amount of electricity consumption and CO2 emission of ITES system were lower 9%
and 9.8%, respectively, in comparison with those of a conventional system. Furthermore, the ITES extra
capital cost could be paid back through savings in electricity cost in 3.43 years.
A major portion of electricity consumption in buildings in residential, administrative, and commercialsectors is related to air-conditioning (A/C) systems. To reduce and shift the electricity consumption ofA/C systems from on-peak hours to off-peak hours, an ice thermal energy storage (ITES) can be utilized.In this paper, thermo-economic optimization of an ITES system was carried out for A/C applications. Inorder to consider the environmental aspects, a penalty cost was considered for CO2 emission. Applyingthe genetic algorithm optimization technique, the optimum values of system design parameters wereobtained. The objective function included the capital and operational costs as well as the penalty costdue to CO2 emission, without and with costs associated with exergy destruction. The results indicatedthat, on average, the amount of electricity consumption and CO2 emission of ITES system were lower 9%and 9.8%, respectively, in comparison with those of a conventional system. Furthermore, the ITES extracapital cost could be paid back through savings in electricity cost in 3.43 years.
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